10-Q

UNITED STATES OF AMERICA

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

_______________________

FORM 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2011
OR
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE TRANSITION PERIOD FROM         TO       

Commission File Number 001-34223

_______________________

CLEAN HARBORS, INC.

(Exact name of registrant as specified in its charter)

Massachusetts	04-2997780
(State of Incorporation)	(IRS Employer Identification No.)
42 Longwater Drive, Norwell, MA	02061-9149
(Address of Principal Executive Offices)	(Zip Code)

(781) 792-5000

(Registrant’s Telephone Number, Including area code)

_______________________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding twelve months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes x  No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes  x  No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer,” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o
(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act). Yes o  No x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Common Stock, $.01 par value	53,061,946
(Class)	(Outstanding at November 3, 2011)

CLEAN HARBORS, INC.

QUARTERLY REPORT ON FORM 10-Q

TABLE OF CONTENTS

	Page No.
PART I: FINANCIAL INFORMATION
ITEM 1: Unaudited Financial Statements
Consolidated Balance Sheets	1
Unaudited Consolidated Statements of Income	3
Unaudited Consolidated Statements of Cash Flows	4
Unaudited Consolidated Statements of Stockholders’ Equity	5
Notes to Unaudited Consolidated Financial Statements	6
ITEM 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
ITEM 3: Quantitative and Qualitative Disclosures About Market Risk	49
ITEM 4: Controls and Procedures	49
PART II: OTHER INFORMATION
Items No. 1 through 6	51
Signatures	54

CLEAN HARBORS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

ASSETS

(in thousands)

	September 30, 2011		December 31, 2010
	(unaudited)
Current assets:
Cash and cash equivalents	$	257,159	$	302,210
Marketable securities	93		3,174
Accounts receivable, net of allowances aggregating $14,285 and $23,704, respectively	414,079		332,678
Unbilled accounts receivable	41,728		19,117
Deferred costs	5,831		6,891
Prepaid expenses and other current assets	37,278		28,939
Supplies inventories	53,614		44,546
Deferred tax assets	16,488		14,982
Total current assets	826,270		752,537
Property, plant and equipment:
Land	36,664		31,654
Asset retirement costs (non-landfill)	2,353		2,242
Landfill assets	51,935		54,519
Buildings and improvements	184,242		147,285
Camp equipment	102,683		62,717
Vehicles	218,111		162,397
Equipment	696,638		537,937
Furniture and fixtures	3,635		2,293
Construction in progress	32,841		33,005
	1,329,102		1,034,049
Less—accumulated depreciation and amortization	448,383		378,655
Total property, plant and equipment, net	880,719		655,394
Other assets:
Long-term investments	4,239		5,437
Deferred financing costs	14,325		7,768
Goodwill	134,696		60,252
Permits and other intangibles, net of accumulated amortization of $68,531 and $60,633, respectively	140,970		114,400
Other	9,166		6,687
Total other assets	303,396		194,544
Total assets	$	2,010,385	$	1,602,475

The accompanying notes are an integral part of these unaudited consolidated financial statements.

1

CLEAN HARBORS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (Continued)

LIABILITIES AND STOCKHOLDERS’ EQUITY

(in thousands)

	September 30, 2011			December 31, 2010
	(unaudited)
Current liabilities:
Current portion of capital lease obligations	$	8,570		$	7,954
Accounts payable	201,561			136,978
Deferred revenue	28,627			30,745
Accrued expenses	138,911			116,089
Current portion of closure, post-closure and remedial liabilities	15,899			14,518
Total current liabilities	393,568			306,284
Other liabilities:
Closure and post-closure liabilities, less current portion of $5,086 and $5,849, respectively	27,420			32,830
Remedial liabilities, less current portion of $10,813 and $8,669, respectively	124,183			128,944
Long-term obligations	524,590			264,007
Capital lease obligations, less current portion	7,531			6,839
Unrecognized tax benefits and other long-term liabilities	92,887			82,744
Total other liabilities	776,611			515,364
Stockholders’ equity:
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 53,038,399 and 52,772,392 shares, respectively	530			528
Treasury stock	(4,274		)	(2,467		)
Shares held under employee participation plan	(777		)	(777		)
Additional paid-in capital	499,086			488,384
Accumulated other comprehensive income	12,222			50,759
Accumulated earnings	333,419			244,400
Total stockholders’ equity	840,206			780,827
Total liabilities and stockholders’ equity	$	2,010,385		$	1,602,475

The accompanying notes are an integral part of these unaudited consolidated financial statements.

2

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF INCOME

(in thousands except per share amounts)

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2011			2010			2011			2010
Revenues	$	556,053		$	487,651		$	1,438,250		$	1,314,186
Cost of revenues (exclusive of items shown separately below)	386,518			335,273			1,006,849			919,970
Selling, general and administrative expenses	65,704			53,619			178,752			149,832
Accretion of environmental liabilities	2,435			2,495			7,231			7,799
Depreciation and amortization	34,604			22,892			87,000			67,671
Income from operations	66,792			73,372			158,418			168,914
Other income (loss)	164			(669		)	5,931			2,485
Loss on early extinguishment of debt	—			(2,294		)	—			(2,294		)
Interest expense, net of interest income of $153 and $700 for the quarter and year-to-date ended 2011 and $297 and $564 for the quarter and year-to-date ended 2010, respectively	(10,927		)	(7,198		)	(28,047		)	(21,772		)
Income from continuing operations before provision for income taxes	56,029			63,211			136,302			147,333
Provision for income taxes	18,896			24,384			47,283			42,941
Income from continuing operations	37,133			38,827			89,019			104,392
Income from discontinued operations, net of tax	—			—			—			2,794
Net income	$	37,133		$	38,827		$	89,019		$	107,186
Earnings per share:
Basic	$	0.70		$	0.74		$	1.68		$	2.04
Diluted	$	0.70		$	0.73		$	1.67		$	2.03
Weighted average common shares outstanding	53,023			52,658			52,921			52,581
Weighted average common shares outstanding plus potentially dilutive common shares	53,370			52,963			53,298			52,852

The accompanying notes are an integral part of these unaudited consolidated financial statements.

3

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Nine Months Ended
	September 30,
	2011			2010
Cash flows from operating activities:
Net income	$	89,019		$	107,186
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	87,000			67,671
Allowance for doubtful accounts	623			163
Amortization of deferred financing costs and debt discount	1,230			2,221
Accretion of environmental liabilities	7,231			7,799
Changes in environmental liability estimates	(2,467		)	(5,391		)
Deferred income taxes	(197		)	540
Stock-based compensation	5,329			5,220
Excess tax benefit of stock-based compensation	(1,949		)	(1,221		)
Income tax benefit related to stock option exercises	1,949			1,215
Gains on sales of businesses	—			(2,678		)
Other income	(2,577		)	(2,485		)
Write-off deferred financing costs and debt discount	—			1,394
Environmental expenditures	(8,551		)	(8,704		)
Changes in assets and liabilities, net of acquisitions
Accounts receivable	(32,670		)	(63,714		)
Other current assets	(14,113		)	(18,456		)
Accounts payable	30,241			47,828
Other current liabilities	(8,762		)	15,342
Net cash from operating activities	151,336			153,930
Cash flows from investing activities:
Additions to property, plant and equipment	(113,644		)	(74,741		)
Acquisitions, net of cash acquired	(336,960		)	(13,846		)
Additions to intangible assets, including costs to obtain or renew permits	(2,356		)	(3,262		)
Purchase of available for sale securities	—			(1,486		)
Proceeds from sales of marketable securities	425			2,627
Proceeds from sales of fixed assets and assets held for sale	5,925			15,963
Proceeds from insurance settlement	—			1,336
Proceeds from sale of long-term investments	1,000			1,300
Net cash used in investing activities	(445,610		)	(72,109		)
Cash flows from financing activities:
Change in uncashed checks	(2,580		)	(4,682		)
Proceeds from exercise of stock options	1,089			550
Remittance of shares, net	(1,897		)	(198		)
Proceeds from employee stock purchase plan	2,451			1,769
Deferred financing costs paid	(8,442		)	(53		)
Payments on capital leases	(5,775		)	(3,361		)
Distribution of cash earned on employee participation plan	(189		)	(148		)
Excess tax benefit of stock-based compensation	1,949			1,221
Principal payment on debt	—			(30,000		)
Issuance of senior secured notes, including premium	261,250			—
Net cash from financing activities	247,856			(34,902		)
Effect of exchange rate change on cash	1,367			451
(Decrease) increase in cash and cash equivalents	(45,051		)	47,370
Cash and cash equivalents, beginning of period	302,210			233,546
Cash and cash equivalents, end of period	$	257,159		$	280,916
Supplemental information:
Cash payments for interest and income taxes:
Interest paid	$	30,169		$	26,230
Income taxes paid	35,085			39,813
Non-cash investing and financing activities:
Property, plant and equipment accrued	$	20,288		$	4,775
Assets acquired through capital lease	1,471			10,130
Issuance of acquisition-related common stock, net	—			1,015

The accompanying notes are an integral part of these unaudited consolidated financial statements.

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands)

	Common Stock							Shares Held Under Employee Participation Plan								Accumulated Other Comprehensive Income
	Number of Shares		$ 0.01 Par Value		Treasury Stock						Additional Paid-in Capital			Comprehensive Income					Accumulated Earnings		Total Stockholders’ Equity
Balance at January 1, 2011	52,772		$	528	$	(2,467	)	$	(777	)	$	488,384				$	50,759		$	244,400	$	780,827
Net income	—		—		—			—			—			89,019		—			89,019		89,019
Change in fair value of available for sale securities, net of taxes	—		—		—			—			—			(805	)	(805		)	—		(805		)
Foreign currency translation	—		—		—			—			—			(37,732	)	(37,732		)	—		(37,732		)
Total comprehensive income	—		—		—			—			—			50,482		—			—		—
Stock-based compensation	184		—		—			—			5,305					—			—		5,305
Issuance of restricted shares, net of shares remitted	(40	)	—		(1,807		)	—			(90		)			—			—		(1,897		)
Exercise of stock options	53		2		—			—			1,087					—			—		1,089
Net tax benefit on exercise of stock options	—		—		—			—			1,949					—			—		1,949
Employee stock purchase plan	69		—		—			—			2,451					—			—		2,451
Balance at September 30, 2011	53,038		$	530	$	(4,274	)	$	(777	)	$	499,086				$	12,222		$	333,419	$	840,206

The accompanying notes are an integral part of these unaudited consolidated financial statements.

5

CLEAN HARBORS, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(1) BASIS OF PRESENTATION

The accompanying consolidated interim financial statements include the accounts of Clean Harbors, Inc. and its subsidiaries (collectively, “Clean Harbors” or the “Company”) and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) and, in the opinion of management, include all adjustments which are of a normal recurring nature, necessary for a fair presentation of the financial position, results of operations, and cash flows for the periods presented. The results for interim periods are not necessarily indicative of results for the entire year or any other interim periods. The financial statements presented herein should be read in connection with the financial statements included in the Company’s Current Report on Form 8-K filed on July 15, 2011.

On June 8, 2011, the Company’s Board of Directors authorized a two-for-one stock split of the Company’s common stock in the form of a stock dividend of one share for each outstanding share. The stock dividend was paid on July 26, 2011 to holders of record at the close of business on July 6, 2011. The stock split followed the approval, at the Company’s 2011 annual meeting of stockholders, of a proposal to increase the Company’s authorized shares of common stock from 40 million to 80 million. The stock split did not change the proportionate interest that a stockholder maintained in the Company. All share and per share information, including options, restricted and performance stock awards, stock option exercises, employee stock purchase plan purchases, common stock and additional paid-in capital accounts on the consolidated balance sheets and consolidated statements of income and stockholders’ equity, have been retroactively adjusted to reflect the two-for-one stock split. In addition, awards granted and weighted average fair value of awards granted in Note 12, “Stock-Based Compensation,” have also been retroactively adjusted.

During the quarter ended March 31, 2011, the Company re-aligned its management reporting structure. Under the new structure, the Company’s operations are managed in four segments: Technical Services, Field Services, Industrial Services and Oil and Gas Field Services. The new segment, Oil and Gas Field Services, consists of the previous Exploration Services segment, as well as certain departments that were re-assigned from the Industrial Services segment. In addition, certain departments from the Field Services segment were re-assigned to the Industrial Services segment. Accordingly, the Company re-aligned and re-allocated departmental costs being allocated among the segments to support these management reporting changes. The Company has recast the segment information to conform to the current year presentation. See Note 14, “Segment Reporting.”

The four operating segments consist of:

• Technical Services — provides a broad range of hazardous material management services including the packaging, collection, transportation, treatment and disposal of hazardous and non-hazardous waste at Company owned incineration, landfill, wastewater, and other treatment facilities.

• Field Services — provides a wide variety of environmental cleanup services on customer sites or other locations on a scheduled or emergency response basis including tank cleaning, decontamination, remediation, and spill cleanup.

• Industrial Services — provides industrial and specialty services, such as high-pressure and chemical cleaning, catalyst handling, decoking, material processing, surface rentals and industrial lodging services to refineries, chemical plants, oil sands facilities, pulp and paper mills, and other industrial facilities.

• Oil and Gas Field Services — provides fluid handling, fluid hauling, down hole servicing, surface rentals, exploration, mapping and directional boring services to the energy sector serving oil and gas exploration, production, and power generation.

Technical Services and Field Services are included as part of Clean Harbors Environmental Services, and Industrial Services and Oil and Gas Field Services are included as part of Clean Harbors Energy and Industrial Services.

(2) SIGNIFICANT ACCOUNTING POLICIES

The accompanying unaudited consolidated financial statements of the Company reflect the application of certain new or updated significant accounting policies as described below:

Property, Plant and Equipment (excluding landfill assets)

6

Property, plant and equipment are stated at cost and include amounts capitalized under capital lease obligations. Expenditures for major renewals and improvements which extend the life of the asset are capitalized. Items of an ordinary repair or maintenance nature are charged directly to operating expense as incurred. During the construction and development period of an asset, the costs incurred, including applicable interest costs, are classified as construction-in-progress. Interest in the amount of $0.4 million and $0.3 million was capitalized to fixed assets during the nine months ended September 30, 2011, and 2010, respectively. Depreciation expense was $70.4 million and $53.9 million for the nine months ended September 30, 2011, and 2010, respectively.

The Company depreciates the cost of these assets, using the straight-line method as follows:

Asset Classification	Estimated Useful Life
Buildings and building improvements
Buildings	30—40 years
Land, leasehold and building improvements	5—40 years
Camp equipment	12—15 years
Vehicles	3—12 years
Equipment
Capitalized software and computer equipment	3 years
Solar equipment	20 years
Containers and railcars	15—20 years
All other equipment	3—10 years
Furniture and fixtures	5—8 years

Land, leasehold and building improvements have a weighted average life of 8.3 years.

Camp equipment consists of industrial lodging facilities that are utilized in the Company’s Industrial Services segment to provide lodging services to companies in the refinery and petrochemical industries.

Solar equipment consists of a solar array that is used to provide electric power for a continuously operating groundwater decontamination pump and treatment system at a closed and capped landfill located in New Jersey. The solar array was installed and became operable during the second quarter of 2011.

The Company recognizes an impairment in the carrying value of long-lived assets when the expected future undiscounted cash flows derived from the assets are less than their carrying value. For the three and nine months ended September 30, 2011, and 2010, the Company has not recorded impairment charges related to long-lived assets.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) and are adopted by the Company as of the specified effective dates. Unless otherwise discussed below, management believes that the impact of recently issued accounting pronouncements will not have a material impact on the Company’s financial position, results of operations and cash flows, or do not apply to the Company’s operations.

In 2009, the FASB issued Accounting Standards Update (ASU) 2009-13, Revenue Recognition (Topic 605)—Multiple-Deliverable Revenue Arrangements, or ASU 2009-13 which provides additional guidance on the recognition of revenue from multiple element arrangements. ASU 2009-13 states that if vendor specific objective evidence or third party evidence for deliverables in an arrangement cannot be determined, companies are required to develop a best estimate of the selling price for separate deliverables and allocate arrangement consideration using the relative selling price method. This guidance is effective for fiscal years beginning after June 15, 2010 and may be applied prospectively to new or materially modified arrangements after the effective date or retrospectively. The Company adopted ASU 2009-13 prospectively as of January 1, 2011 and although the adoption did not materially impact its financial condition, results of operations, or cash flow, this guidance may impact the Company’s determination of the separation of deliverables for future arrangements.

7

In June 2011, the FASB issued ASU 2011-5 Comprehensive Income (Topic 220) — Presentation of Comprehensive Income. The new guidance revises the manner in which entities present comprehensive income in their financial statements. ASU 2011-5 requires entities to report components of comprehensive income in either (1) a continuous statement of comprehensive income or (2) two separate but consecutive statements. The ASU does not change the items that must be reported in other comprehensive income. This guidance will require a change in the presentation of the financial statements and will require retrospective application. The Company will adopt this guidance as of January 2012 and has not determined which approach it will adopt.

In September 2011, the FASB issued ASU 2011-08 which amends the guidance on testing goodwill for impairment. Under the revised guidance, entities testing goodwill for impairment have the option of performing a qualitative assessment before calculating the fair value of the reporting unit (i.e., step 1 of the goodwill impairment test). If entities determine, on the basis of qualitative factors, that the fair value of the reporting unit is more likely than not less than the carrying amount, the two-step impairment test would be required. The ASU does not change how goodwill is calculated or assigned to reporting units, nor does it revise the requirement to test goodwill annually for impairment. In addition, the ASU does not amend the requirement to test goodwill for impairment between annual tests if events or circumstances warrant; however, it does revise the examples of events and circumstances that an entity should consider. The amendments are effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted. The Company will adopt this standard on January 1, 2012 and management does not expect this pronouncement will have a material impact on its financial statements.

(3) BUSINESS COMBINATIONS

Acquisitions during the third quarter

During the quarter ended September 30, 2011, the Company acquired (i) certain assets of a Canadian public company which is engaged in the business of providing geospatial, line clearing and drilling services in Canada and the United States; (ii) all of the outstanding stock of a privately owned U.S. company which specializes in treating refinery waste streams primarily in the United States; and (iii) all of the outstanding stock of a privately owned Canadian company which manufactures modular buildings. The combined purchase price for the three acquisitions was approximately $144.2 million, including the assumption and payment of debt of $25.2 million, and preliminary post-closing adjustments of $6.5 million based upon the assumed target amounts of working capital.

The Company's current period acquisitions discussed above will (i) enhance the Company's service offerings to its customers and its reputation as a leading provider of comprehensive field services for the oil and gas sectors; (ii) provide a complement to Clean Harbors' catalyst handling, industrial and specialty industrial services for the refinery and petrochemical industry; and (iii) help expand its growing lodging business, respectively. These current period acquisitions have been integrated with the Oil and Gas Field Services, Technical Services and Industrial Services segments of the Company's operations and reporting structure.

The following table summarizes the preliminary aggregate purchase price for the current period acquisitions at their acquisition dates (in thousands of U.S. dollars).

Cash consideration	$	112,450
Debt assumed and paid-off on acquisition date	25,183
Estimated net amount due to the sellers for working capital adjustments	6,524
Total estimated purchase price	$	144,157

The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands). The fair value of all the acquired identifiable assets and liabilities summarized below is provisional pending finalization of the Company's acquisition accounting.

8

	At the Acquisition Dates (As reported at September 30, 2011)
Current assets (i)	$	40,028
Property, plant and equipment	60,109
Customer relationships and other intangibles	23,371
Other assets	196
Current liabilities	(19,522		)
Asset retirement obligations and remedial liabilities	(193		)
Other liabilities	(4,469		)
Total identifiable net assets	99,520
Goodwill (ii)	44,637
Total	$	144,157

(i) The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million.

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $16.3 million, $12.8 million and $15.5 million has been assigned to the Oil and Gas Field Services segment, the Technical Services segment, and the Industrial Services segment, respectively. Certain amounts will not be deductible for tax purposes.

Management has determined the preliminary purchase price allocations based on estimates of the fair values of all tangible and intangible assets acquired and liabilities assumed. Such amounts are subject to adjustment based on the additional information necessary to determine fair values.

Acquisition related costs of $0.5 million and $0.7 million were included in selling, general and administrative expenses in the Company's consolidated statements of income for the three and nine months ended September 30, 2011, respectively.

The results of operations of the acquired businesses have been included in the Company's consolidated financial statements since the respective acquisition dates. Revenues attributable to the current period acquisitions included in the Company's consolidated statements of income for each of the three and nine months ended September 30, 2011 were approximately $13.1 million. The Company has determined that the separate disclosure of earnings for those current period acquisitions is impracticable for the three and nine months ended September 30, 2011 due to the integration of those businesses' operations into the Company upon acquisition.

The following unaudited pro forma combined summary data presents information as if the current period acquisitions had been acquired at the beginning of 2010 and 2011 and assumes that there were no material, non-recurring pro forma adjustment directly attributable to the acquisitions. The pro forma information does not necessarily reflect the actual results that would have occurred had the Company and those three acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Pro forma combined revenues	$	575,010	$	513,253	$	1,545,216	$	1,392,234
Pro forma combined net income	$	35,822	$	36,496	$	93,372	$	102,460

Peak

On June 10, 2011, the Company acquired 100% of the outstanding common shares of Peak Energy Services Ltd. (“Peak”) (other than the 3.15% of Peak’s outstanding common shares which the Company already owned) in exchange for approximately CDN $158.7 million in cash (CDN $0.95 for each Peak share) and the assumption and payment of Peak net debt of approximately

9

CDN $37.5 million. The total acquisition price, which includes the previous investment in Peak shares referred to above, was approximately CDN $200.2 million, or U.S. $205.1 million based on an exchange rate of 0.976057 CDN $ to one U.S. $ on June 10, 2011.

Peak is a diversified energy services corporation headquartered in Calgary, Alberta, operating in western Canada and the U.S. Through its various operating divisions, Peak provides drilling and production equipment and services to its customers in the conventional and unconventional oil and natural gas industries as well as the oil sands region of western Canada. Peak also provides water technology solutions to a variety of customers throughout North America. Peak employs approximately 900 people. Peak shares previously traded on the Toronto Stock Exchange under the symbol “PES.” The Company anticipates that this acquisition will expand its presence in the energy services marketplace, particularly in the area of oil and natural gas drilling and production support. The Peak business has been integrated within the Oil and Gas Field Services and Industrial Services segments of the Company’s operations and reporting structure.

The following table summarizes the preliminary purchase price for Peak at the acquisition date (in thousands of U.S. dollars).

Cash paid for Peak common shares	$	162,585
Fair value of previously owned common shares (1)	4,117
Peak net debt assumed (2)	38,431
Total estimated purchase price	$	205,133

_______________________

(1) The Company previously owned a 3.15% interest in Peak which was recorded in marketable securities. On June 10, 2011, the Company acquired the remaining outstanding shares of Peak and as a result, the Company remeasured the fair value of its previously held common shares and recognized the resulting gain of $1.9 million in other income. The unrealized gain on the Peak investment was previously recorded in accumulated other comprehensive income. For this purpose, the fair value of the Company’s previous investment in Peak was deemed to be $4.1 million, calculated based on the closing price of Peak’s shares on the Toronto Stock Exchange on the date before the acquisition was publicly announced.

(2) The outstanding Peak debt, net of $15.7 million of cash assumed, which consisted of three term loan facilities, was paid off on June 10, 2011.

Acquisition related costs of $0.1 million and $0.7 million were included in selling, general and administrative expenses in the Company’s consolidated statements of income for the three and nine months ended September 30, 2011, respectively.

The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands). The fair value of all the acquired identifiable assets and liabilities summarized below is provisional pending finalization of the Company's acquisition accounting. Measurement period adjustments reflect new information obtained about facts and circumstances that existed as of the acquisition date. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed but the Company is waiting for additional information necessary to finalize fair value. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one year from the acquisition date. Final determination of the fair value may result in further adjustments to the values presented below.

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	June 10, 2011 (As reported at June 30, 2011)			Measurement Period Adjustments			June 10, 2011 (As adjusted)
Current assets (i)	$	45,797		$	(811	)	$	44,986
Property, plant and equipment	149,344			921			150,265
Identifiable intangible assets	14,107			(921		)	13,186
Other assets	8,800			(7,691		)	1,109
Current liabilities	(27,717		)	(643		)	(28,360		)
Asset retirement obligations	—			(103		)	(103		)
Other liabilities	(8,344		)	218			(8,126		)
Total identifiable net assets	$	181,987		$	(9,030	)	$	172,957
Goodwill (ii)	23,146			9,030			32,176
Total	$	205,133		$	—		$	205,133

_______________________

(i) The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary fair value of $33.3 million. The gross amount due was $34.7 million.

(ii) Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $13.0 million and $19.2 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectively; however, the amount and the allocation are subject to change pending the finalization of the Company’s valuation.

The Company has determined that the separate disclosure of Peak’s earnings is impracticable for the three and nine months ended September 30, 2011 due to the integration of Peak operations into the Company upon acquisition. Revenues attributable to Peak included in the Company’s consolidated statements of income for the three and nine months ended September 30, 2011 were $58.2 million and $67.8 million, respectively.

The following unaudited pro forma combined summary data presents information as if Peak had been acquired at the beginning of 2010 and 2011 and assumes that there was no material, non-recurring pro forma adjustment directly attributable to the acquisition. The pro forma information does not necessarily reflect the actual results that would have occurred had the Company and Peak been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Pro forma combined revenues	$	560,130	$	527,425	$	1,537,520	$	1,422,979
Pro forma combined net income	$	37,558	$	41,378	$	91,295	$	103,795

Status of Proposed Acquisition of Badger

The Company entered on January 25, 2011 into a definitive agreement to acquire Badger Daylighting Ltd. (“Badger”), an Alberta corporation headquartered in Calgary, Alberta. Under the terms of the acquisition agreement, a condition to the respective obligations of each of the Company and Badger to complete the transaction was approval of the transaction by a required affirmative vote of at least 66 2/3 % of Badger’s shareholders and option holders voting on the matter. At a meeting held on April 26, 2011, the Badger shareholders and option holders failed to approve the transaction by the required vote. In accordance with the terms of the acquisition agreement, the Company terminated the agreement on April 26, 2011. The acquisition agreement provided that if the Company terminated the agreement because of a failure by the Badger shareholders and option holders to approve the transaction by the required vote, Badger was obligated to reimburse the Company’s out of pocket expenses incurred in connection with the proposed transaction including the financing thereof, up to a maximum of CDN $1.5 million. Based on a demand letter sent to Badger in May 2011, the Company received U.S. $1.1 million from Badger in June for reimbursement in accordance with this provision of the agreement.

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(4) FAIR VALUE MEASUREMENTS

The Company’s financial instruments consist of cash and cash equivalents, marketable securities, receivables, trade payables, auction rate securities and long-term debt. The estimated fair value of cash equivalents, receivables, and trade payables approximate their carrying value due to the short maturity of these instruments. As of September 30, 2011, the Company held certain marketable securities and auction rate securities that are required to be measured at fair value on a recurring basis. The fair value of marketable securities is recorded based on quoted market prices. The auction rate securities are classified as available for sale and the fair value of these securities as of September 30, 2011 was estimated utilizing a discounted cash flow analysis. The discounted cash flow analysis considered, among other items, the collateralization underlying the security investments, the creditworthiness of the counterparty, the timing of expected future cash flows, and the expectation of the next time these securities are expected to have a successful auction. The auction rate securities were also compared, when possible, to other observable market data with similar characteristics to the securities held by the Company.

As of September 30, 2011, all of the Company’s auction rate securities continue to have AAA underlying ratings. The underlying assets of the Company’s auction rate securities are student loans, which are substantially insured by the Federal Family Education Loan Program. During the three months ended September 30, 2011, the Company liquidated $1.0 million in auction rate securities at par. The Company attributes the $0.5 million decline in the fair value of the securities from the original cost basis to external liquidity issues rather than credit issues. The Company assessed the decline in value to be temporary because it does not intend to sell and it is more likely than not that the Company will not have to sell the securities before their maturity.

During the nine months ended September 30, 2011 and 2010, the Company recorded an unrealized pre-tax loss of $0.2 million and a pre-tax gain of $0.2 million, respectively, on its auction rate securities, which was included in accumulated other comprehensive income. As of September 30, 2011, the Company continued to earn interest on its auction rate securities according to their stated terms with interest rates resetting generally every 28 days.

The Company’s assets measured at fair value on a recurring basis at September 30, 2011 and December 31, 2010 were as follows (in thousands):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2011
Auction rate securities	$	—	$	—	$	4,239	$	4,239
Marketable securities	$	93	$	—	$	—	$	93

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2010
Auction rate securities	$	—	$	—	$	5,437	$	5,437
Marketable securities	$	3,174	$	—	$	—	$	3,174

The decrease in marketable securities since December 31, 2010 was primarily due to the Peak acquisition on June 10, 2011. The Company previously owned a 3.15% interest in Peak which was recorded in marketable securities.

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The following tables present the changes in the Company’s auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and nine months ended September 30, 2011 and 2010 (in thousands):

	Three Months Ended
	September 30,
	2011			2010
Balance at July 1,	$	5,311		$	5,315
Sale of auction rate securities	(1,000		)	—
Unrealized (losses) gains included in other comprehensive income	(72		)	115
Balance at September 30,	$	4,239		$	5,430

	Nine Months Ended
	September 30,
	2011			2010
Balance at January 1,	$	5,437		$	6,503
Sale of auction rate securities	(1,000		)	(1,300		)
Unrealized (losses) gains included in other comprehensive income	(198		)	227
Balance at September 30,	$	4,239		$	5,430

(5) GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the nine months ended September 30, 2011 were as follows (in thousands):

	2011
Balance at January 1, 2011	$	60,252
Acquired from acquisitions	80,394
Foreign currency translation	(5,950		)
Balance at September 30, 2011	$	134,696

The increase in goodwill during the nine months ended September 30, 2011 was primarily attributed to the recent acquisitions. The goodwill related to these acquisitions includes estimates that are subject to change based upon final fair value determinations. Below is a summary of amortizable other intangible assets (in thousands):

	September 30, 2011							December 31, 2010
	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)
Permits	$	106,504	$	44,569	$	61,935	18.0	$	103,493	$	42,430	$	61,063	15.9
Customer relationships	82,206		15,234		66,972		8.2	58,322		10,418		47,904		8.0
Other intangible assets	20,791		8,728		12,063		4.7	13,218		7,785		5,433		3.5
	$	209,501	$	68,531	$	140,970	14.1	$	175,033	$	60,633	$	114,400	9.4

The aggregate amortization expense for the three and nine months ended September 30, 2011 was $3.2 million and $8.7

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million, respectively. The aggregate amortization expense for the three and nine months ended September 30, 2010 was $2.8 million and $8.0 million respectively.

The increase in customer relationships and other intangible assets was primarily attributed to the recent acquisitions. Amounts are provisional and subject to change upon completion of final valuations. The total amounts assigned and the weighted average amortization period by major intangible asset classes as it relates to these acquisitions as of September 30, 2011, are as follows:

	Peak Total Amount Assigned		Peak Weighted Average Amortization Period (in years)	Other Acquisitions Total Amount Assigned		Other Acquisitions Weighted Average Amortization Period (in years)
Customer relationships	$	9,246	6.7	$	16,556	15.0
Other intangibles	3,069		5.9	2,953		14.1
	$	12,315	6.5	$	19,509	14.9

Below is the expected future amortization for the net carrying amount of finite lived intangible assets at September 30, 2011 (in thousands):

Years Ending December 31,	Expected Amortization
2011 (three months)	$	4,028
2012	13,466
2013	12,927
2014	12,302
2015	11,678
Thereafter	86,569
	$	140,970

(6) ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	September 30, 2011		December 31, 2010
Insurance	$	21,886	$	19,736
Interest	5,222		7,826
Accrued disposal costs	2,238		2,173
Accrued compensation and benefits	47,277		44,545
Income, real estate, sales and other taxes	24,637		19,529
Other	37,651		22,280
	$	138,911	$	116,089

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(7) CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the nine months ended September 30, 2011 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2011	$	29,756		$	8,923		$	38,679
Liabilities assumed in acquisitions	—			196			196
New asset retirement obligations	1,749			—			1,749
Accretion	1,654			842			2,496
Changes in estimates recorded to statement of income	(936		)	(15		)	(951		)
Other changes in estimates recorded to balance sheet	(6,150		)	121			(6,029		)
Settlement of obligations	(3,011		)	(441		)	(3,452		)
Currency translation and other	(141		)	(41		)	(182		)
Balance at September 30, 2011	$	22,921		$	9,585		$	32,506

All of the landfill facilities included in the above were active as of September 30, 2011.

New asset retirement obligations incurred in 2011 are being discounted at the credit-adjusted risk-free rate of 8.79% and inflated at a rate of 1.01%.

(8) REMEDIAL LIABILITIES

The changes to remedial liabilities for the nine months ended September 30, 2011 were as follows (in thousands):

	Remedial Liabilities for Landfill Sites			Remedial Liabilities for Inactive Sites			Remedial Liabilities (Including Superfund) for Non-Landfill Operations			Total
Balance at January 1, 2011	$	5,511		$	82,354		$	49,748		$	137,613
Liabilities assumed in acquisitions	—			—			100			100
Accretion	203			2,849			1,683			4,735
Changes in estimates recorded to statement of income	(8		)	(933		)	(575		)	(1,516		)
Settlement of obligations	(49		)	(2,741		)	(2,309		)	(5,099		)
Currency translation and other	(134		)	(7		)	(696		)	(837		)
Balance at September 30, 2011	$	5,523		$	81,522		$	47,951		$	134,996

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(9) FINANCING ARRANGEMENTS

The following table is a summary of the Company’s financing arrangements (in thousands):

	September 30, 2011		December 31, 2010
Senior secured notes, at 7.625%, due August 15, 2016	$	520,000	$	270,000
Revolving credit facility, due May 31, 2016	—		—
Unamortized notes premium and discount, net	4,590		(5,993		)
Long-term obligations	$	524,590	$	264,007

On May 31, 2011, the Company increased its previous $120.0 million revolving credit facility to a $250.0 million revolving credit facility (described below).

As of December 31, 2010, the Company had outstanding $270.0 million aggregate principal amount of 7.625% senior secured notes due 2016.  On March 24, 2011, the Company issued an additional $250.0 million aggregate principal amount of such notes (the “new notes”).  Under the purchase agreement, the new notes were priced for purposes of resale at 104.5% of the aggregate principal amount, representing an effective yield to maturity of 6.132%. In addition to such 104.5% purchase price, the purchase price paid to the Company for the new notes also included interest accrued on the new notes from and including February 15, 2011. The net proceeds from the issuance and sale of the new notes, after deducting the initial purchasers’ discount and estimated other transaction expenses, were approximately $255.7 million.

The new notes and the $270.0 million of notes issued on the initial issue date are treated as a single class for all purposes including, without limitation, waivers, amendments, redemptions and other offers to purchase. The new notes and the notes issued on the initial issue date are referred to in this report collectively as the “notes” or the “senior secured notes.”

The principal terms of the notes are as follows:

Senior Secured Notes.  The notes will mature on August 15, 2016.  The notes bear interest at a rate of 7.625% per annum. Interest is payable semi-annually on February 15 and August 15 of each year. The notes were issued pursuant to an indenture dated as of August 14, 2009 (as supplemented from time to time, the “indenture”) among the Company, as issuer, the Company’s domestic subsidiaries, as guarantors, and U.S. Bank National Association, as trustee and notes collateral agent.

The fair value of the Company’s currently outstanding notes is based on quoted market prices and was $540.8 million at September 30, 2011 and $278.3 million at December 31, 2010.

The Company may redeem some or all of the notes at any time on or after August 15, 2012 at the following redemption prices (expressed as percentages of the principal amount) if redeemed during the twelve-month period commencing on August 15 of the year set forth below, plus, in each case, accrued and unpaid interest, if any, to the date of redemption:

Year	Percentage
2012	103.813	%
2013	101.906	%
2014 and thereafter	100.000	%

At any time on or after September 29, 2011 but prior to August 15, 2012, the Company may also redeem up to $30.0 million (10% of the aggregate principal amount of the notes originally issued under the indenture) of the notes at a redemption price of 103% of the principal amount, plus any accrued and unpaid interest. Prior to August 15, 2012, the Company may also redeem up to $105.0 million (35% of the aggregate principal amount of the notes originally issued under the indenture) of the notes at a redemption price of 107.625% of the principal amount, plus any accrued and unpaid interest, using proceeds from certain equity offerings, and may also redeem some or all of the senior secured notes at a redemption price of 100% of the principal amount plus a make-whole premium and any accrued and unpaid interest. Holders may require the Company to repurchase the notes at a purchase price equal to 101% of the principal amount, plus any accrued and unpaid interest, upon a change of control of the Company.

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The notes are guaranteed by substantially all the Company’s current and future domestic restricted subsidiaries. The notes are the Company’s and the guarantors’ senior secured obligations ranking equally, subject to the lien priorities summarized below, with all of the Company’s and the guarantors’ existing and future senior obligations (including obligations under the Company’s credit agreement) and senior to any future indebtedness that is expressly subordinated to the senior secured notes and the guarantees. The notes and the guarantees are secured by a first lien on substantially all of the assets of the Company and its domestic restricted subsidiaries (the “Notes Collateral”), except for accounts receivable, related general intangibles and instruments and proceeds related thereto (the “ABL Collateral”) and certain other excluded collateral as provided in the indenture and subject to certain exceptions and permitted liens. The notes and the guarantees are also secured by a second lien on the ABL Collateral that, along with a second lien on the Notes Collateral, secure the Company’s obligations under its “ABL facility” under its revolving credit agreement. The notes are not guaranteed by, or secured by the assets of, the Company’s Canadian or other foreign subsidiaries.

If the Company or its domestic subsidiaries sell assets under specified circumstances, the Company must offer to repurchase the senior secured notes from certain of the net proceeds of such sale at a purchase price equal to 100% of the principal amount, plus any accrued and unpaid interest, to the applicable repurchase date.

Revolving Credit Facility. On May 31, 2011, the Company entered into an amendment and restatement of the previously existing revolving credit facility with Bank of America, N.A. (“BofA”), as agent for the lenders under the facility.  The principal changes to the terms of the facility were to:

(i) increase the maximum amount of borrowings and letters of credit which the Company may obtain under the facility from $120.0 million to $150.0 million (with a $140.0 million sub-limit for letters of credit);

(ii) add one of the Company’s Canadian subsidiaries (the “Canadian Borrower”) as a party to the facility and allow the Canadian Borrower to obtain up to $100.0 million of borrowings and letters of credit (with a $75.0 million sub-limit for letters of credit), with the obligations of the Canadian Borrower under the facility secured by a first lien on the accounts receivable of the  Canadian Borrower and the Company’s other Canadian subsidiaries and the Company and its U.S. subsidiaries guaranteeing the obligations of the Canadian Borrower, but the Canadian Borrower and the Company’s other Canadian subsidiaries having no guarantee or other responsibility for the obligations of the Company or its U.S. subsidiaries under the facility;

(iii) reduce the interest rate on borrowings under the facility, in the case of LIBOR loans, from LIBOR plus an applicable margin ranging (based primarily on the level of the Company’s fixed charge coverage ratio for the most recently completed four fiscal quarter measurement period) from 2.25% to 2.75% per annum to LIBOR plus an applicable margin ranging from 1.75% to 2.25% per annum and, in the case of base rate loans, from BofA’s base rate plus an applicable margin ranging from 1.25% to 1.75% per annum to BofA’s base rate plus an applicable margin ranging from 0.75% to 1.25% per annum; and

(iv)  extend the term of the facility so that it will expire on the first to occur of (a) May 31, 2016 or (b) 60 days prior to the maturity of the Company’s outstanding senior secured notes on August 15, 2016 if the notes have not by then been refinanced, defeased or reserved against the borrowing base on terms reasonably acceptable to the agent under the amended and restated credit agreement.

The financing arrangements and principal terms of the revolving credit facility are discussed further in the Company’s Current Report on Form 8-K filed on June 3, 2011. There have been no material changes in such terms during the first nine months of 2011.

(10) INCOME TAXES

The Company’s effective tax rate (including taxes on income from discontinued operations) for the three and nine months ended September 30, 2011 was 33.7 percent and 34.7 percent, respectively, compared to 38.6 percent and 29.1 percent, respectively, for the same periods in 2010. The decrease in the effective tax rate for the three months ended September 30, 2011 was primarily attributable to the valuation allowance release that was recorded during the current quarter. The increase in the effective tax rate for the nine months ended September 30, 2011 was primarily attributable to the decrease in unrecognized tax benefits recorded in the third quarter of 2010. Excluding this discrete item, the rate decreased by 3.6% as compared to the nine months ended September 30, 2010, primarily due to the increased profits attributable to Canada, which has a lower corporate income tax rate as compared to the United States, the recording of an energy investment tax credit for a solar energy project placed in service, and the partial release of a valuation allowance that is associated with the Company's foreign tax credits.

As of September 30, 2011, the Company’s unrecognized tax benefits and related reserves were $68.2 million, which included $22.0 million of interest and $6.6 million of penalties. As of December 31, 2010, the Company’s unrecognized tax

17

benefits and related reserves were $65.9 million, which included $19.7 million of interest and $6.5 million of penalties.

Due to expiring statute of limitation periods, the Company anticipates that total unrecognized tax benefits and related reserves, other than adjustments for additional accruals for interest and penalties and foreign currency translation, will decrease by approximately $5.9 million within the next twelve months.  The $5.9 million (which includes interest and penalties of $2.5 million) is primarily related to a historical Canadian business combination and, if realized, will be recorded in earnings and therefore will impact the effective income tax rate.

(11) EARNINGS PER SHARE

The following is a reconciliation of basic and diluted earnings per share computations (in thousands except for per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Numerator for basic and diluted earnings per share:
Income from continuing operations	$	37,133	$	38,827	$	89,019	$	104,392
Income from discontinued operations	—		—		—		2,794
Net income	$	37,133	$	38,827	$	89,019	$	107,186
Denominator:
Basic shares outstanding	53,023		52,658		52,921		52,581
Dilutive effect of equity-based compensation awards	347		305		377		271
Dilutive shares outstanding	53,370		52,963		53,298		52,852
Basic earnings per share:
Income from continuing operations	$	0.70	$	0.74	$	1.68	$	1.99
Income from discontinued operations, net of tax	—		—		—		0.05
Net income	$	0.70	$	0.74	$	1.68	$	2.04
Diluted earnings per share:
Income from continuing operations	$	0.70	$	0.73	$	1.67	$	1.98
Income from discontinued operations, net of tax	—		—		—		0.05
Net income	$	0.70	$	0.73	$	1.67	$	2.03

All shares and per share amounts included in the above table have been adjusted for the two-for-one stock split discussed in Note 1, “Basis of Presentation.” For the three- and nine-month periods ended September 30, 2011, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the above calculations except as follows. For the three- and nine-month periods ended September 30, 2011, the above calculation excluded the dilutive effects of 73 thousand outstanding performance stock awards for which the performance criteria were not attained at that time.  For the three- and nine-month periods ended September 30, 2010, the above calculation excluded the dilutive effects of 170 thousand outstanding performance stock awards for which the performance criteria were not attained at that time and 36 thousand options that were not then in-the-money.

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(12) STOCK-BASED COMPENSATION

The following table summarizes the total number and type of awards granted during the three- and nine-month periods ended September 30, 2011, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2011			September 30, 2011
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	26,091	$	54.13	180,305	$	48.45
Performance stock awards	3,551	$	50.87	73,499	$	50.87
Total awards	29,642			253,804

All shares and weighted average grant date fair values included in the above table have been adjusted for the two-for-one stock split discussed in Note 1, “Basis of Presentation.” Certain performance stock awards granted in June 2011 are subject to both achieving predetermined revenue and EBITDA targets for a specified period of time and service conditions.  As of September 30, 2011, based on year-to-date results of operations, management determined that it was probable that the performance targets for the 2011 performance awards will be achieved by December 31, 2011. As a result, the Company recognized cumulative expense through sales, general and administration expenses during the three and nine months ended September 30, 2011 related to the 2011 performance stock awards.

(13) COMMITMENTS AND CONTINGENCIES

Legal and Administrative Proceedings

The Company’s waste management services are regulated by federal, state, provincial and local laws enacted to regulate discharge of materials into the environment, remediation of contaminated soil and groundwater or otherwise protect the environment. This ongoing regulation results in the Company frequently becoming a party to legal or administrative proceedings involving all levels of governmental authorities and other interested parties. The issues involved in such proceedings generally relate to applications for permits and licenses by the Company and conformity with legal requirements, alleged violations of existing permits and licenses, or alleged responsibility arising under federal or state Superfund laws to remediate contamination at properties owned either by the Company or by other parties (“third party sites”) to which either the Company or prior owners of certain of the Company’s facilities shipped wastes.

At September 30, 2011 and December 31, 2010, the Company had recorded reserves of $29.2 million and $29.7 million, respectively, in the Company’s financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. At September 30, 2011 and December 31, 2010, the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $2.6 million and $2.8 million more, respectively. The Company periodically adjusts the aggregate amount of these reserves when these actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of September 30, 2011, the $29.2 million of reserves consisted of (i) $26.6 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets and (ii) $2.6 million primarily related to federal and state enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of September 30, 2011, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2011, were as follows:

Ville Mercier.  In September 2002, the Company acquired the stock of a subsidiary (the “Mercier Subsidiary”) which owns a hazardous waste incinerator in Ville Mercier, Quebec (the “Mercier Facility”). The property adjacent to the Mercier Facility, which is also owned by the Mercier Subsidiary, is now contaminated as a result of actions dating back to 1968, when the Government of Quebec issued to a company unrelated to the Mercier Subsidiary two permits to dump organic liquids into lagoons on the property. By 1972, groundwater contamination had been identified, and the Quebec government provided an alternate water supply to the municipality of Ville Mercier.

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In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec. The lawsuits assert that the defendants are jointly and severally responsible for the contamination of groundwater in the region, which they claim caused each municipality to incur additional costs to supply drinking water for their citizens since the 1970’s and early 1980’s. The four municipalities claim a Canadian dollar (“CDN”) total of $1.6 million as damages for additional costs to obtain drinking water supplies and seek an injunctive order to obligate the defendants to remediate the groundwater in the region. The Quebec Government also sued the Mercier Subsidiary to recover approximately $17.4 million (CDN) of alleged past costs for constructing and operating a treatment system and providing alternative drinking water supplies.

On September 26, 2007, the Quebec Minister of Sustainable Development, Environment and Parks issued a Notice pursuant to Section 115.1 of the Environment Quality Act, superseding Notices issued in 1992, which are the subject of the pending litigation. The more recent Notice notifies the Mercier Subsidiary that, if the Mercier Subsidiary does not take certain remedial measures at the site, the Minister intends to undertake those measures at the site and claim direct and indirect costs related to such measures. The Mercier Subsidiary continues to assert that it has no responsibility for the groundwater contamination in the region and will contest any action by the Ministry to impose costs for remedial measures on the Mercier Subsidiary. The Company also continues to pursue settlement options. At September 30, 2011 and December 31, 2010, the Company had accrued $13.4 million and $13.5 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings.

CH El Dorado.  In August 2006, the Company purchased all of the outstanding membership interests in Teris LLC (“Teris”) and changed the name of Teris to Clean Harbors El Dorado, LLC (“CH El Dorado”). At the time of the acquisition, Teris was, and CH El Dorado now is, involved in certain legal proceedings arising from a fire on January 2, 2005, at the incineration facility owned and operated by Teris in El Dorado, Arkansas.

CH El Dorado is defending vigorously the claims asserted against Teris in those proceedings, and the Company believes that the resolution of those proceedings related to the fire will not have a material adverse effect on the Company’s financial position, results of operations or cash flows. In addition to CH El Dorado’s defenses to the lawsuits, the Company will be entitled to rely upon an indemnification from the seller of the membership interests in Teris which is contained in the purchase agreement for those interests. Under that agreement, the seller agreed to indemnify (without any deductible amount) the Company against any damages which the Company might suffer as a result of the lawsuits to the extent that such damages are not fully covered by insurance or the reserves which Teris had established on its books prior to the acquisition. The seller’s parent also guaranteed the indemnification obligation of the seller to the Company.

Deer Trail, Colorado Facility.  Since April 5, 2006, the Company has been involved in various legal proceedings which have arisen as a result of the issuance by the Colorado Department of Public Health and Environment (“CDPHE”) of a radioactive materials license (“RAD License”) to a Company subsidiary, Clean Harbors Deer Trail, LLC (“CHDT”) to accept certain low level radioactive materials known as “NORM/TENORM” wastes for disposal. Adams County, the county where the CHDT facility is located, filed two suits against the CDPHE in Colorado effectively seeking to invalidate the license. The two suits filed in 2006 were both dismissed and those dismissals were upheld by the Colorado Court of Appeals. Adams County appealed those rulings to the Colorado Supreme Court which ruled on October 13, 2009 on the procedural issue that the County did have standing to challenge the license in district court and remanded the case back to that court for further proceedings. Adams County filed a third suit directly against CHDT in 2007 again attempting to invalidate the license. That suit was dismissed on November 14, 2008, and Adams County has now appealed that dismissal to the Colorado Court of Appeals. The Company continues to believe that the grounds asserted by the County are factually and legally baseless and has contested the appeal vigorously. The Company has not recorded any liability for this matter on the basis that such liability is currently neither probable nor estimable.

Superfund Proceedings

The Company has been notified that either the Company or the prior owners of certain of the Company’s facilities for which the Company may have certain indemnification obligations have been identified as potentially responsible parties (“PRPs”) or potential PRPs in connection with 63 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 63 sites, two involve facilities that are now owned by the Company and 61 involve third party sites to which either the Company or the prior owners shipped wastes. In connection with each site, the Company has estimated the extent, if any, to which it may be subject, either directly or as a result of any such indemnification provisions, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements, and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company’s facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated

20

cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts, and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations.

The Company’s potential liability for cleanup costs at the two facilities now owned by the Company and at 35 (the “Listed Third Party Sites”) of the 61 third party sites arose out of the Company’s 2002 acquisition of substantially all of the assets (the “CSD assets”) of the Chemical Services Division of Safety-Kleen Corp. As part of the purchase price for the CSD assets, the Company became liable as the owner of these two facilities and also agreed to indemnify the prior owners of the CSD assets against their share of certain cleanup costs for the Listed Third Party Sites payable to governmental entities under federal or state Superfund laws. Of the 35 Listed Third Party Sites, 11 are currently requiring expenditures on remediation, ten are now settled, and 14 are not currently requiring expenditures on remediation. The status of the two facilities owned by the Company (the Wichita Property and the BR Facility) and one of the Listed Third Party Sites (the Casmalia sites) are further described below. There are also two third party sites at which the Company has been named a PRP as a result of its acquisition of the CSD assets but disputes that it has any cleanup or related liabilities; one such site (the Marine Shale site) is described below. The Company views any liabilities associated with the Marine Shale site and the other third party site as excluded liabilities under the terms of the CSD asset acquisition, but the Company is working with the EPA on a potential settlement. In addition to the CSD related Superfund sites, there are certain of the other third party sites which are not related to the Company’s acquisition of the CSD assets, and certain notifications which the Company has received about other third party sites.

Wichita Property.  The Company acquired in 2002 as part of the CSD assets a service center located in Wichita, Kansas (the “Wichita Property”). The Wichita Property is one of several properties located within the boundaries of a 1,400 acre state-designated Superfund site in an old industrial section of Wichita known as the North Industrial Corridor Site. Along with numerous other PRPs, the former owner executed a consent decree relating to such site with the EPA, and the Company is continuing its ongoing remediation program for the Wichita Property in accordance with that consent decree. The Company also acquired rights under an indemnification agreement between the former owner and an earlier owner of the Wichita Property, which the Company anticipates but cannot guarantee will be available to reimburse certain such cleanup costs.

BR Facility.  The Company acquired in 2002 as part of the CSD assets a former hazardous waste incinerator and landfill in Baton Rouge (the “BR Facility”), for which operations had been previously discontinued by the prior owner. In September 2007, the United States Environmental Protection Agency (the “EPA”) issued a special notice letter to the Company related to the Devil’s Swamp Lake Site (“Devil’s Swamp”) in East Baton Rouge Parish, Louisiana. Devil’s Swamp includes a lake located downstream of an outfall ditch where wastewater and stormwater have been discharged, and Devil’s Swamp is proposed to be included on the National Priorities List due to the presence of Contaminants of Concern (“COC”) cited by the EPA. These COCs include substances of the kind found in wastewater and storm water discharged from the BR Facility in past operations. The EPA originally requested COC generators to submit a good faith offer to conduct a remedial investigation feasibility study directed towards the eventual remediation of the site. The Company is currently performing corrective actions at the BR Facility under an order issued by the Louisiana Department of Environmental Quality (the “LDEQ”), and has begun conducting the remedial investigation and feasibility study under an order issued by the EPA. The Company cannot presently estimate the potential additional liability for the Devil’s Swamp cleanup until a final remedy is selected by the EPA.

Casmalia Site.  At one of the 35 Listed Third Party Sites, the Casmalia Resources Hazardous Waste Management Facility (the “Casmalia site”) in Santa Barbara County, California, the Company received from the EPA a request for information in May 2007. In that request, the EPA is seeking information about the extent to which, if at all, the prior owner transported or arranged for disposal of waste at the Casmalia site. The Company has not recorded any liability for this 2007 notice on the basis that such transporter or arranger liability is currently neither probable nor estimable.

Marine Shale Site.  Prior to 1996, Marine Shale Processors, Inc. (“Marine Shale”) operated a kiln in Amelia, Louisiana which incinerated waste producing a vitrified aggregate as a by-product. Marine Shale contended that its operation recycled waste into a useful product, i.e., vitrified aggregate, and therefore was exempt from regulation under the RCRA and permitting requirements as a hazardous waste incinerator under applicable federal and state environmental laws. The EPA contended that Marine Shale was a “sham-recycler” subject to the regulation and permitting requirements as a hazardous waste incinerator under RCRA, that its vitrified aggregate by-product was a hazardous waste, and that Marine Shale’s continued operation without required permits was illegal. Litigation between the EPA and Marine Shale began in 1990 and continued until July 1996, when the U.S. Fifth Circuit Court of Appeals ordered Marine Shale to shut down its operations.

On May 11, 2007, the EPA and the LDEQ issued a special notice to the Company and other PRPs, seeking a good faith offer to address site remediation at the former Marine Shale facility. Certain of the former owners of the CSD assets were major customers of Marine Shale, but the Marine Shale site was not included as a Listed Third Party Site in connection with the Company’s acquisition of the CSD assets and the Company was never a customer of Marine Shale. Although the Company

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believes that it is not liable (either directly or under any indemnification obligation) for cleanup costs at the Marine Shale site, the Company elected to join with other parties which had been notified that are potentially PRPs in connection with Marine Shale site to form a group (the “Site Group”) to retain common counsel and participate in further negotiations with the EPA and the LDEQ directed towards the eventual remediation of the Marine Shale site. The Site Group made a good faith settlement offer to the EPA on November 29, 2007, and negotiations among the EPA, the LDEQ and the Site Group with respect to the Marine Shale site are ongoing. At September 30, 2011 and December 31, 2010, the amount of the Company’s reserves relating to the Marine Shale site was $3.9 million and $3.8 million, respectively.

Certain Other Third Party Sites.  At 14 of the 61 third party sites, the Company has an indemnification agreement with ChemWaste, a former subsidiary of Waste Management, Inc. and the prior owner. The agreement indemnifies the Company with respect to any liability at the 14 sites for waste disposed prior to the Company’s acquisition of the sites. Accordingly, Waste Management is paying all costs of defending those subsidiaries in those 14 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company’s ultimate liabilities for these sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. The Company does not have an indemnity agreement with respect to any of the other remaining 61 third party sites not discussed above. However, the Company believes that its additional potential liability, if any, to contribute to the cleanup of such remaining sites will not, in the aggregate, exceed $100,000.

Other Notifications.  Between September 2004 and May 2006, the Company also received notices from certain of the prior owners of the CSD assets seeking indemnification from the Company at five third party sites which are not included in the third party sites described above that have been designated as Superfund sites or potential Superfund sites and for which those prior owners have been identified as PRPs or potential PRPs. The Company has responded to such letters asserting that the Company has no obligation to indemnify those prior owners for any cleanup and related costs (if any) which they may incur in connection with these five sites. The Company intends to assist those prior owners by providing information that is now in the Company’s possession with respect to those five sites and, if appropriate, to participate in negotiations with the government agencies and PRP groups involved. The Company has also investigated the sites to determine the existence of potential liabilities independent from the liability of those former owners, and concluded that at this time the Company is not liable for any portion of the potential cleanup of the five sites and therefore has not established a reserve.

Federal, State and Provincial Enforcement Actions

From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of September 30, 2011 and December 31, 2010, there were one and three proceedings, respectively, for which the Company reasonably believed that the sanctions could equal or exceed $100,000. During the nine months ended September 30, 2011, the Company resolved two matters with no impact to the Company's financial results of operations. The Company does not believe that the fines or other penalties in these or any of the other regulatory proceedings will, individually or in the aggregate, have a material adverse effect on its financial condition or results of operations.

Other Contingencies

In December 2010, the Company paid $10.5 million to acquire a minority interest in a privately-held company. Subsequent to the purchase of those securities but prior to December 31, 2010, the privately-held company exercised its irrevocable call right for those shares and tendered payment for a total of $10.5 million. The Company is disputing the fair value asserted by the privately-held company and believes that the shares had a fair value on the date of the exercise of the call right greater than the amount tendered. Due to the exercise of the irrevocable call right, the Company did not own those shares of that privately-held company as of December 31, 2010, and accordingly has recorded the $10.5 million in prepaid expenses and other current assets. The potential recovery of any additional amount depends upon several contested factors, and is considered a gain contingency and therefore has not been recorded in the Company’s consolidated financial statements. At September 30, 2011, the Company still has $10.5 million recorded in prepaid expenses and other current assets.

(14) SEGMENT REPORTING

During the quarter ended March 31, 2011, the Company re-aligned its management reporting structure. Under the new structure, the Company’s operations are managed in four reportable segments: Technical Services, Field Services, Industrial Services and Oil and Gas Field Services. The new segment, Oil and Gas Field Services, consists of the previous Exploration Services segment, as well as certain oil and gas related field services departments that were re-assigned from the Industrial Services segment. In addition, certain departments from the Field Services segment were re-assigned to the Industrial Services segment.  Accordingly, the Company re-aligned and re-allocated departmental costs being allocated among the segments to support these management reporting changes.  The Company has recast the segment information to conform to the current year

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presentation.

Performance of the segments is evaluated on several factors, of which the primary financial measure is “Adjusted EBITDA,” which consists of net income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, and provision for income taxes. Also excluded are other income and income from discontinued operations, net of tax as these amounts are not considered part of usual business operations. Transactions between the segments are accounted for at the Company’s estimate of fair value based on similar transactions with outside customers.

The operations not managed through the Company’s four operating segments are recorded as “Corporate Items.” Corporate Items revenues consist of two different operations for which the revenues are insignificant. Corporate Items cost of revenues represents certain central services that are not allocated to the four operating segments for internal reporting purposes. Corporate Items selling, general and administrative expenses include typical corporate items such as legal, accounting and other items of a general corporate nature that are not allocated to the Company’s four operating segments.

The following table reconciles third party revenues to direct revenues for the three- and nine-month periods ended September 30, 2011 and 2010 (in thousands). Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is the revenue allocated to the segment performing the provided service. The Company analyzes results of operations based on direct revenues because the Company believes that these revenues and related expenses best reflect the manner in which operations are managed.

	For the Three Months Ended September 30, 2011
	Technical Services		Field Services (1)			Industrial Services		Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	209,245	$	117,448		$	113,543	$	115,554		$	263		$	556,053
Intersegment revenues, net	4,612		(6,274		)	4,323		(2,091		)	(570		)	—
Direct revenues	$	213,857	$	111,174		$	117,866	$	113,463		$	(307	)	$	556,053

	For the Three Months Ended September 30, 2010
	Technical Services		Field Services (2)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	177,266	$	183,120		$	79,723	$	47,503	$	39		$	487,651
Intersegment revenues, net	5,577		(8,814		)	2,239		1,529		(531		)	—
Direct revenues	$	182,843	$	174,306		$	81,962	$	49,032	$	(492	)	$	487,651

	For the Nine Months Ended September 30, 2011
	Technical Services		Field Services (1)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	597,022	$	252,322		$	333,502	$	254,805	$	599		$	1,438,250
Intersegment revenues, net	13,963		(15,848		)	363		3,066		(1,544		)	—
Direct revenues	$	610,985	$	236,474		$	333,865	$	257,871	$	(945	)	$	1,438,250

	For the Nine Months Ended September 30, 2010
	Technical Services		Field Services (2)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	498,202	$	396,496		$	270,847	$	148,666	$	(25	)	$	1,314,186
Intersegment revenues, net	17,653		(22,077		)	608		5,151		(1,335		)	—
Direct revenues	$	515,855	$	374,419		$	271,455	$	153,817	$	(1,360	)	$	1,314,186

_______________________

(1) During the three and nine months ended September 30, 2011, third party revenues for the Field Services segment included revenues associated with the Yellowstone River oil spill response efforts of $41.5 million.

(2) During the three and nine months ended September 30, 2010, third party revenues for the Field Services segment included

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revenues associated with the oil spill response efforts in the Gulf of Mexico and Michigan of $123.8 million and $232.4 million, respectively.

The following table presents information used by management by reported segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, and other income to segments.

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2011			2010			2011			2010
Adjusted EBITDA:
Technical Services	$	59,005		$	46,195		$	163,956		$	123,760
Field Services	22,746			48,430			41,592			95,064
Industrial Services	22,677			18,947			71,882			62,929
Oil and Gas Field Services	28,416			10,473			51,508			27,935
Corporate Items	(29,013		)	(25,286		)	(76,289		)	(65,304		)
Total	$	103,831		$	98,759		$	252,649		$	244,384
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	$	2,435		$	2,495		$	7,231		$	7,799
Depreciation and amortization	34,604			22,892			87,000			67,671
Income from operations	66,792			73,372			158,418			168,914
Other (income) loss	(164		)	669			(5,931		)	(2,485		)
Loss on early extinguishment of debt	—			2,294			—			2,294
Interest expense, net of interest income	10,927			7,198			28,047			21,772
Income from continuing operations before provision for income taxes	$	56,029		$	63,211		$	136,302		$	147,333

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The following table presents assets by reported segment and in the aggregate (in thousands):

	September 30, 2011		December 31, 2010
Property, plant and equipment, net
Technical Services	$	292,652	$	259,582
Field Services	36,130		32,311
Industrial Services	231,979		180,781
Oil and Gas Field Services	278,546		151,244
Corporate Items	41,412		31,476
Total property, plant and equipment, net	$	880,719	$	655,394
Intangible assets:
Technical Services
Goodwill	$	45,965	$	33,448
Permits and other intangibles, net	79,509		66,075
Total Technical Services	125,474		99,523
Field Services
Goodwill	3,088		3,088
Permits and other intangibles, net	3,331		3,651
Total Field Services	6,419		6,739
Industrial Services
Goodwill	45,941		10,934
Permits and other intangibles, net	20,531		17,906
Total Industrial Services	66,472		28,840
Oil and Gas Field Services
Goodwill	39,702		12,782
Permits and other intangibles, net	37,599		26,768
Total Oil and Gas Field Services	77,301		39,550
Total	$	275,666	$	174,652

The following table presents the total assets by reported segment (in thousands):

	September 30, 2011		December 31, 2010
Technical Services	$	588,389	$	525,286
Field Services	44,998		35,253
Industrial Services	322,631		221,472
Oil and Gas Field Services	463,863		272,479
Corporate Items	590,504		547,985
Total	$	2,010,385	$	1,602,475

The following table presents the total assets by geographical area (in thousands):

	September 30, 2011		December 31, 2010
United States	$	1,109,827	$	933,550
Canada	894,850		664,534
Other foreign	5,708		4,391
Total	$	2,010,385	$	1,602,475

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(15) GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

As of December 31, 2010, the Company had outstanding $270.0 million aggregate principal amount of 7.625% senior secured notes due 2016 issued by the parent company, Clean Harbors, Inc., and on March 24, 2011, the parent company issued an additional $250.0 million aggregate principal amount of such notes.  The combined $520.0 million of the parent’s senior secured notes outstanding at September 30, 2011 is guaranteed by substantially all of the parent’s subsidiaries organized in the United States. Each guarantor is a wholly-owned subsidiary of the Company and its guarantee is both full and unconditional and joint and several.  The parent’s notes are not guaranteed by the Company’s Canadian or other foreign subsidiaries. The following presents supplemental condensed consolidating financial information for the parent company, the guarantor subsidiaries and the non-guarantor subsidiaries, respectively.

Following is the condensed consolidating balance sheet at September 30, 2011 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	91,557	$	145,150	$	20,452	$	—		$	257,159
Intercompany receivables	346,750		—		148,818		(495,568		)	—
Other current assets	15,139		329,710		224,262		—			569,111
Property, plant and equipment, net	—		389,481		491,238		—			880,719
Investments in subsidiaries	1,002,994		377,275		94,626		(1,474,895		)	—
Intercompany debt receivable	—		443,819		3,701		(447,520		)	—
Other long-term assets	16,327		115,352		171,717		—			303,396
Total assets	$	1,472,767	$	1,800,787	$	1,154,814	$	(2,417,983	)	$	2,010,385
Liabilities and Stockholders’ Equity:
Current liabilities	$	39,568	$	208,021	$	145,979	$	—		$	393,568
Intercompany payables	—		495,568		—		(495,568		)	—
Closure, post-closure and remedial liabilities, net	—		131,490		20,113		—			151,603
Long-term obligations	524,590		—		—		—			524,590
Capital lease obligations, net	—		573		6,958		—			7,531
Intercompany debt payable	3,701		—		443,819		(447,520		)	—
Other long-term liabilities	64,702		8,326		19,859		—			92,887
Total liabilities	632,561		843,978		636,728		(943,088		)	1,170,179
Stockholders’ equity	840,206		956,809		518,086		(1,474,895		)	840,206
Total liabilities and stockholders’ equity	$	1,472,767	$	1,800,787	$	1,154,814	$	(2,417,983	)	$	2,010,385

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Following is the condensed consolidating balance sheet at December 31, 2010 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	100,476	$	124,582	$	77,152	$	—		$	302,210
Intercompany receivables	371,559		—		—		(371,559		)	—
Other current assets	15,521		279,895		154,911		—			450,327
Property, plant and equipment, net	—		302,028		353,366		—			655,394
Investments in subsidiaries	628,723		259,294		91,654		(979,671		)	—
Intercompany debt receivable	—		368,804		3,701		(372,505		)	—
Other long-term assets	7,768		87,888		98,888		—			194,544
Total assets	$	1,124,047	$	1,422,491	$	779,672	$	(1,723,735	)	$	1,602,475
Liabilities and Stockholders’ Equity:
Current liabilities	$	13,935	$	201,384	$	90,965	$	—		$	306,284
Intercompany payables	—		222,750		148,809		(371,559		)	—
Closure, post-closure and remedial liabilities, net	—		141,280		20,494		—			161,774
Long-term obligations	264,007		—		—		—			264,007
Capital lease obligations, net	—		249		6,590		—			6,839
Intercompany debt payable	3,701		—		368,804		(372,505		)	—
Other long-term liabilities	61,577		2,531		18,636		—			82,744
Total liabilities	343,220		568,194		654,298		(744,064		)	821,648
Stockholders’ equity	780,827		854,297		125,374		(979,671		)	780,827
Total liabilities and stockholders’ equity	$	1,124,047	$	1,422,491	$	779,672	$	(1,723,735	)	$	1,602,475

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Following is the consolidating statement of income for the three months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	327,093		$	237,589		$	(8,629	)	$	556,053
Cost of revenues (exclusive of items shown separately below)	—			229,272			165,875			(8,629		)	386,518
Selling, general and administrative expenses	27			39,889			25,788			—			65,704
Accretion of environmental liabilities	—			2,120			315			—			2,435
Depreciation and amortization	—			16,069			18,535			—			34,604
Income from operations	(27		)	39,743			27,076			—			66,792
Other income	—			51			113			—			164
Interest (expense) income	(10,739		)	(10		)	(178		)	—			(10,927		)
Equity in earnings of subsidiaries	52,408			18,548			—			(70,956		)	—
Intercompany dividend income (expense)	—			—			3,491			(3,491		)	—
Intercompany interest income (expense)	—			6,759			(6,759		)	—			—
Income from operations before provision for income taxes	41,642			65,091			23,743			(74,447		)	56,029
Provision for income taxes	4,509			8,335			6,052			—			18,896
Net income (loss)	$	37,133		$	56,756		$	17,691		$	(74,447	)	$	37,133

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Following is the consolidating statement of income for the three months ended September 30, 2010 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	346,045	$	142,426		$	(820	)	$	487,651
Cost of revenues (exclusive of items shown separately below)	—			235,915		100,178			(820		)	335,273
Selling, general and administrative expenses	25			40,903		12,691			—			53,619
Accretion of environmental liabilities	—			2,218		277			—			2,495
Depreciation and amortization	—			12,367		10,525			—			22,892
Income from operations	(25		)	54,642		18,755			—			73,372
Other income (loss)	—			74		(743		)	—			(669		)
Loss on early extinguishment of debt	(2,294		)	—		—			—			(2,294		)
Interest (expense) income	(7,196		)	78		(80		)	—			(7,198		)
Equity in earnings of subsidiaries	56,001			8,641		—			(64,642		)	—
Intercompany dividend income (expense)	—			—		3,292			(3,292		)	—
Intercompany interest income (expense)	—			8,243		(8,243		)	—			—
Income from continuing operations before provision for income taxes	46,486			71,678		12,981			(67,934		)	63,211
Provision for income taxes	7,659			12,596		4,129			—			24,384
Income from continuing operations	38,827			59,082		8,852			(67,934		)	38,827
Income from discontinued operations, net of tax	—			—		—			—			—
Net income	$	38,827		$	59,082	$	8,852		$	(67,934	)	$	38,827

29

Following is the consolidating statement of income for the nine months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	838,654	$	619,615		$	(20,019	)	$	1,438,250
Cost of revenues (exclusive of items shown separately below)	—			582,767		444,101			(20,019		)	1,006,849
Selling, general and administrative expenses	77			114,621		64,054			—			178,752
Accretion of environmental liabilities	—			6,297		934			—			7,231
Depreciation and amortization	—			41,760		45,240			—			87,000
Income from operations	(77		)	93,209		65,286			—			158,418
Other income	—			3,781		2,150			—			5,931
Interest (expense) income	(28,045		)	163		(165		)	—			(28,047		)
Equity in earnings of subsidiaries	129,273			50,260		—			(179,533		)	—
Intercompany dividend income (expense)	—			—		10,484			(10,484		)	—
Intercompany interest income (expense)	—			24,459		(24,459		)	—			—
Income from operations before provision for income taxes	101,151			171,872		53,296			(190,017		)	136,302
Provision for income taxes	12,132			21,511		13,640			—			47,283
Net income	$	89,019		$	150,361	$	39,656		$	(190,017	)	$	89,019

Following is the consolidating statement of income for the nine months ended September 30, 2010 (in thousands):

30

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	869,468	$	449,354		$	(4,636	)	$	1,314,186
Cost of revenues (exclusive of items shown separately below)	—			597,323		327,283			(4,636		)	919,970
Selling, general and administrative expenses	75			109,947		39,810			—			149,832
Accretion of environmental liabilities	—			6,958		841			—			7,799
Depreciation and amortization	—			35,894		31,777			—			67,671
Income from operations	(75		)	119,346		49,643			—			168,914
Other income (loss)	—			388		2,097			—			2,485
Loss on early extinguishment of debt	(2,294		)	—		—			—			(2,294		)
Interest (expense) income	(21,668		)	127		(231		)	—			(21,772		)
Equity in earnings of subsidiaries	149,216			35,457		—			(184,673		)	—
Intercompany dividend income (expense)	—			—		9,904			(9,904		)	—
Intercompany interest income (expense)	—			24,450		(24,450		)	—			—
Income from continuing operations before provision for income taxes	125,179			179,768		36,963			(194,577		)	147,333
Provision for income taxes	17,993			26,960		(2,012		)	—			42,941
Income from continuing operations	107,186			152,808		38,975			(194,577		)	104,392
Income from discontinued operations, net of tax	—			—		2,794			—			2,794
Net income	$	107,186		$	152,808	$	41,769		$	(194,577	)	$	107,186

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Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(16,908	)	$	77,653		$	90,591		$	151,336
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,274		)	(38,370		)	(113,644		)
Acquisitions, net of cash acquired	—			(50,166		)	(286,794		)	(336,960		)
Costs to obtain or renew permits	—			(486		)	(1,870		)	(2,356		)
Proceeds from sales of fixed assets	—			545			5,380			5,925
Proceeds from sale of marketable securities	—			—			425			425
Proceeds from sale of long term investments	—			1,000			—			1,000
Investment in subsidiaries	(258,597		)	178,884			79,713			—
Net cash from investing activities	(258,597		)	54,503			(241,516		)	(445,610		)
Cash flows from financing activities:
Change in uncashed checks	—			(1,363		)	(1,217		)	(2,580		)
Proceeds from exercise of stock options	1,089			—			—			1,089
Proceeds from employee stock purchase plan	2,451			—			—			2,451
Remittance of shares, net	(1,897		)	—			—			(1,897		)
Excess tax benefit of stock-based compensation	1,949			—			—			1,949
Deferred financing costs paid	(8,442		)	—			—			(8,442		)
Payments on capital leases	—			(532		)	(5,243		)	(5,775		)
Distribution of cash earned on employee participation plan	—			—			(189		)	(189		)
Issuance of senior secured notes, including premium	261,250			—			—			261,250
Dividends (paid) / received	10,186			(24,306		)	14,120			—
Interest (payments) / received	—			35,088			(35,088		)	—
Intercompany debt	—			(120,475		)	120,475			—
Net cash from financing activities	266,586			(111,588		)	92,858			247,856
Effect of exchange rate change on cash	—			—			1,367			1,367
(Decrease) increase in cash and cash equivalents	(8,919		)	20,568			(56,700		)	(45,051		)
Cash and cash equivalents, beginning of period	100,476			124,582			77,152			302,210
Cash and cash equivalents, end of period	$	91,557		$	145,150		$	20,452		$	257,159

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Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2010 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(3,688	)	$	100,673		$	56,945		$	153,930
Cash flows from investing activities:
Additions to property, plant and equipment	—			(42,501		)	(32,240		)	(74,741		)
Acquisitions, net of cash acquired	—			(13,846		)	—			(13,846		)
Additions to intangible assets, including costs to obtain or renew permits	—			(1,203		)	(2,059		)	(3,262		)
Purchase of available for sale securities	—			—			(1,486		)	(1,486		)
Proceeds from sale of fixed assets and assets held for sale	—			997			14,966			15,963
Proceeds from sale of marketable securities	—			—			2,627			2,627
Proceeds from sale of long-term investments	—			1,300			—			1,300
Proceeds from insurance settlement	—			—			1,336			1,336
Investment in subsidiaries	(236,700		)	236,700			—			—
Net cash from investing activities	(236,700		)	181,447			(16,856		)	(72,109		)
Cash flows from financing activities:
Change in uncashed checks	—			(1,347		)	(3,335		)	(4,682		)
Proceeds from exercise of stock options	550			—			—			550
Proceeds from employee stock purchase plan	1,769			—			—			1,769
Remittance of shares, net	(198		)	—			—			(198		)
Excess tax benefit of stock-based compensation	1,221			—			—			1,221
Deferred financing costs paid	(53		)	—			—			(53		)
Payments of capital leases	—			(284		)	(3,077		)	(3,361		)
Principle payment on debt	(30,000		)	—			—			(30,000		)
Distribution of cash earned on employee participation plan	—			—			(148		)	(148		)
Interest (payments) / received	—			19,363			(19,363		)	—
Intercompany debt	236,700			(236,700		)	—			—
Net cash from financing activities	209,989			(218,968		)	(25,923		)	(34,902		)
Effect of exchange rate change on cash	—			—			451			451
(Decrease) increase in cash and cash equivalents	(30,399		)	63,152			14,617			47,370
Cash and cash equivalents, beginning of period	141,338			50,408			41,800			233,546
Cash and cash equivalents, end of period	$	110,939		$	113,560		$	56,417		$	280,916

(16) SUBSEQUENT EVENT

On November 2, 2011, the Company announced that it expects to temporarily idle the hazardous waste incinerator in Ville Mercier, Quebec, for approximately eighteen months from the beginning of the first quarter of 2012. Factors influencing the decision include uncertainties over the local economic environment and the Company's ability to transfer waste streams to its other facilities. The Company has performed an analysis of the long-lived assets and concluded that there was no impairment from the temporary idling of the incinerator. The Company will continue to monitor for impairment as necessary. The Company expects to recognize idling costs and severance costs in the fourth quarter of 2011 which in the aggregate are not material.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Forward-Looking Statements

In addition to historical information, this quarterly report contains forward-looking statements, which are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans to,” “estimates,” “projects,” or similar expressions. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those reflected in these forward-looking statements. Factors that might cause such a difference include, but are not limited to, those discussed under Item 1A, “Risk Factors,” in our Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 1, 2011, under Item 1A, “Risk Factors,” included in Part II—Other Information in this report, and in other documents we file from time to time with the Securities and Exchange Commission.  Readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management’s opinions only as of the date hereof. We undertake no obligation to revise or publicly release the results of any revision to these forward-looking statements.

General

We are a leading provider of environmental, energy and industrial services throughout North America.  We serve over 50,000 customers, including a majority of Fortune 500 companies, thousands of smaller private entities and numerous federal, state, provincial and local governmental agencies.  We have more than 175 locations, including over 50 waste management facilities, throughout North America in 37 U.S. states, seven Canadian provinces, Mexico and Puerto Rico.  We also operate international locations in Bulgaria, China, Singapore, Sweden, Thailand and the United Kingdom.

During the quarter ended March 31, 2011, we re-aligned our management reporting structure. Under the new structure, our operations are managed in four reportable segments: Technical Services, Field Services, Industrial Services and Oil and Gas Field Services. The new segment, Oil and Gas Field Services, consists of the previous Exploration Services segment, as well as certain oil and gas related field services departments that were re-assigned from the Industrial Services segment. In addition, certain departments from the Field Services segment were re-assigned to the Industrial Services segment.  Accordingly, we re-aligned and re-allocated departmental costs being allocated among the segments to support these management reporting changes.  This new structure reflects the way management makes operating decisions and manages the growth and profitability of the business.  The amounts presented for the three and nine months ended September 30, 2010 have been recast to reflect the impact of such changes.  Under the new structure, the four operating segments consist of:

• Technical Services — provide a broad range of hazardous material management services including the packaging, collection, transportation, treatment and disposal of hazardous and non-hazardous waste at Company owned incineration, landfill, wastewater, and other treatment facilities.

• Field Services — provide a wide variety of environmental cleanup services on customer sites or other locations on a scheduled or emergency response basis including tank cleaning, decontamination, remediation, and spill cleanup.

• Industrial Services — provides industrial and specialty services, such as high-pressure and chemical cleaning, catalyst handling, decoking, material processing, surface rentals and industrial lodging services to refineries, chemical plants, oil sands facilities, pulp and paper mills, and other industrial facilities.

• Oil and Gas Field Services — provides fluid handling, fluid hauling, down hole servicing, surface rentals, exploration, mapping and directional boring services to the energy sector serving oil and gas exploration, production, and power generation.

Technical Services and Field Services are included as part of Clean Harbors Environmental Services, and Industrial Services and Oil and Gas Field Services are included as part of Clean Harbors Energy and Industrial Services.

Overview

During the quarter ended September 30, 2011, we acquired (i) certain assets of a Canadian public company which is engaged in the business of providing geospatial, line clearing and drilling services in Canada and the United States; (ii) all of the outstanding stock of a privately owned U.S. company which specializes in treating refinery waste streams primarily in the United States; and (iii) all of the outstanding stock of a privately owned Canadian company which manufactures modular buildings. The combined purchase price for the three acquisitions was approximately $144.2 million, including the assumption and payment of debt of $25.0 million, and preliminary post-closing adjustments of $6.5 million based upon the assumed target amounts of

34

working capital.

Our current period acquisitions discussed above will (i) enhance our service offerings to our customers and our reputation as a leading provider of comprehensive field services for the oil and gas sectors; (ii) provide a complement to our catalyst handling, industrial and specialty industrial services for the refinery and petrochemical industry; and (iii) help expand our growing lodging business, respectively. These current period acquisitions have been integrated with the Oil and Gas Field Services, Technical Services and Industrial Services segments of our operations and reporting structure.

On June 10, 2011, we completed the acquisition of Peak Energy Services Ltd. (“Peak”) and integrated the Peak operations with our existing systems and processes. Peak is a diversified energy services organization headquartered in Calgary, Alberta, operating in western Canada and the U.S. Through its various operating divisions, Peak provides drilling and production equipment and services to its customers in the conventional and unconventional oil and natural gas industries as well as the oil sands region of western Canada.  Peak also provides water technology solutions to a variety of customers throughout North America. Peak employs approximately 900 people. We anticipate that this acquisition will expand our presence in the energy services marketplace, particularly in the area of oil and natural gas drilling and production support. The Peak business has been integrated within the Oil and Gas Field Services and Industrial Services segments of our operations and reporting structure.

We acquired 100% of Peak’s outstanding common shares (other than the 3.15% of Peak’s outstanding common shares which we already owned) in exchange for approximately CDN $158.7 million in cash (CDN $0.95 for each Peak share), and the assumption and payment of Peak net debt of approximately CDN $37.5 million. The total acquisition price, which includes the previous investment in Peak shares referred to above, was approximately CDN $200.2 million or U.S. $205.1 million based on an exchange rate of 0.976057 CDN $ to one U.S. $ on June 10, 2011.

During the three months ended September 30, 2011, our revenues were $556.1 million, compared with $487.7 million during the three months ended September 30, 2010.  Revenue for the three months ended September 30, 2011 included our emergency response efforts related to the Yellowstone River oil spill in Montana of $41.5 million. The same period in the prior year included revenue associated with the oil spill response efforts at the Gulf of Mexico and Michigan of $123.8 million. The year-over-year revenue growth, exclusive of the oil spill project work, was driven by broad-based growth across all of our segments.  Our revenues were also favorably impacted by $8.3 million due to the strengthening of the Canadian dollar.

Our Technical Services revenues accounted for 38% of our total revenues for the three months ended September 30, 2011.  The year-over-year increase in revenues of 17% was primarily due to revenue growth at our incinerators, treatment, storage and disposal facilities, and landfills.  The utilization rate at our incinerators was 89% and our landfill volumes increased more than 16% year-over-year.

Our Field Services revenues accounted for 20% of our total revenues for the three months ended September 30, 2011.Exclusive of the oil spill project revenues generated during the three months ended September 30, 2010 and 2011, the year-over-year increase in Field Services revenues of approximately 38% resulted primarily from a steady stream of large-scale project work.

Our Industrial Services revenues accounted for 21% of our total revenues for the three months ended September 30, 2011. The year-over-year increase in revenue of 44% was primarily due to work performed for an unplanned shutdown at one of our customer’s sites, continued investment in the oil sands region of Canada, incremental revenues from refinery turnaround work, revenues associated with the acquisitions including Peak, and high utilization rates at the camps in our lodging business.

Our Oil and Gas Field Services revenues accounted for 20% of our total revenues for the three months ended September 30, 2011. The year-over-year increase of 131% was primarily due to contributions from the acquisitions including Peak, increased activity in Western Canada due to increased oil prices, and continued investments in U.S. gas and oil production resulting in increased demand for our services.

Our cost of revenues increased from $335.3 million in the third quarter of 2010 to $386.5 million in the third quarter of 2011.  The third quarter of 2011 included $28.9 million of cost of revenues associated with the Yellowstone oil spill project and 2010 included $74.4 million of cost of revenues associated with the Gulf of Mexico and Michigan oil spill projects.   Exclusive of those oil spill costs, our cost of revenues increased primarily due to costs associated with our recent acquisitions and because of our increased revenues.  Our gross profit margin was 30.5% for the three months ended September 30, 2011, which is down slightly from 31.2% in the same period last year when we benefited from the $124 million in higher emergency response revenue.  

During the three months ended September 30, 2011, our net income was also affected by an effective tax rate for the

35

current quarter of 33.7%, compared with 38.6% for the same period last year. The decrease in the effective tax rate was primarily attributable to a valuation allowance release in the third quarter of 2011 associated with our foreign tax credits and the increased profits attributable to Canada, which has a lower corporate income tax rate as compared to the United States.

Environmental Liabilities

We have accrued environmental liabilities as of September 30, 2011, of approximately $167.5 million, substantially all of which we assumed as part of our acquisitions of the Chemical Services Division, or “CSD,” of Safety-Kleen Corp. in 2002, Teris LLC in 2006, and one of the two solvent recycling facilities we purchased from Safety-Kleen Systems, Inc. in 2008.  We anticipate such liabilities will be payable over many years and that cash flows generated from operations will be sufficient to fund the payment of such liabilities when required. However, events not now anticipated (such as future changes in environmental laws and regulations) could require that such payments be made earlier or in greater amounts than currently anticipated.

We realized a net benefit in the nine months ended September 30, 2011 of $2.5 million related to changes in our environmental liability estimates. Changes in environmental liability estimates include changes in landfill retirement liability estimates, which are recorded in cost of revenues, and changes in non-landfill retirement and remedial liability estimates, which are recorded in selling, general and administrative costs.  During the nine months ended September 30, 2011, a benefit of approximately $1.0 million was recorded in cost of revenues and a benefit of approximately $1.5 million was recorded in selling, general and administrative expenses. See further detail discussed in Note 7, “Closure and Post-Closure Liabilities,” and Note 8, “Remedial Liabilities,” to our consolidated financial statements included in Item 1 of this report.

Results of Operations

The following table sets forth for the periods indicated certain operating data associated with our results of operations. This table and subsequent discussions should be read in conjunction with Item 6, “Selected Financial Data,” of our Annual Report on Form 10-K for the year ended December 31, 2010, Item 8, “Financial Statements and Supplementary Data,” included in our Current Report on Form 8-K filed on July 15, 2011 and Item 1, “Financial Statements,” in this report.

	Percentage of Total Revenues
	For the Three Months Ended				For the Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Revenues	100.0	%	100.0	%	100.0	%	100.0	%
Cost of revenues (exclusive of items shown separately below)	69.5		68.8		70.0		70.0
Selling, general and administrative expenses	11.8		11.0		12.4		11.4
Accretion of environmental liabilities	0.4		0.5		0.5		0.6
Depreciation and amortization	6.2		4.7		6.0		5.1
Income from operations	12.1		15.0		11.1		12.9
Other income	—		(0.1	)	0.4		0.2
Loss on early extinguishment of debt	—		(0.4	)	—		(0.2	)
Interest expense, net of interest income	(2.0	)	(1.5	)	(2.0	)	(1.7	)
Income from continuing operations before provision for income taxes	10.1		13.0		9.5		11.2
Provision for income taxes	3.4		5.0		3.3		3.3
Income from continuing operations	6.7		8.0		6.2		7.9
Income from discontinued operations, net of tax	—		—		—		0.2
Net income	6.7	%	8.0	%	6.2	%	8.1	%

Earnings Before Interest, Taxes, Depreciation and Amortization (“Adjusted EBITDA”)

We define Adjusted EBITDA (a measure not defined under generally accepted accounting principles) as net income plus accretion of environmental liabilities, depreciation and amortization, net interest expense and provision for income taxes, less

36

other income and income from discontinued operations, net of tax.  Our management considers Adjusted EBITDA to be a measurement of performance which provides useful information to both management and investors. Adjusted EBITDA should not be considered an alternative to net income or other measurements under generally accepted accounting principles in the United States (“GAAP”). Because Adjusted EBITDA is not calculated identically by all companies, our measurements of Adjusted EBITDA may not be comparable to similarly titled measures reported by other companies.

We use Adjusted EBITDA to enhance our understanding of our core operating performance, which represents our views concerning our performance in the ordinary, ongoing and customary course of our operations. We historically have found it helpful, and believe that investors have found it helpful, to consider an operating measure that excludes expenses such as debt extinguishment and related costs relating to transactions not reflective of our core operations.

The information about our core operating performance provided by this financial measure is used by our management for a variety of purposes. We regularly communicate Adjusted EBITDA results to our board of directors and discuss with the board our interpretation of such results. We also compare our Adjusted EBITDA performance against internal targets as a key factor in determining cash bonus compensation for executives and other employees, largely because we believe that this measure is indicative of how the fundamental business is performing and is being managed.

We also provide information relating to our Adjusted EBITDA so that analysts, investors and other interested persons have the same data that we use to assess our core operating performance. We believe that Adjusted EBITDA should be viewed only as a supplement to the GAAP financial information. We also believe, however, that providing this information in addition to, and together with, GAAP financial information permits the foregoing persons to obtain a better understanding of our core operating performance and to evaluate the efficacy of the methodology and information used by management to evaluate and measure such performance on a standalone and a comparative basis.

The following is a reconciliation of net income to Adjusted EBITDA (in thousands):

	For the Three Months Ended					For the Nine Months Ended
	September 30,					September 30,
	2011			2010		2011			2010
Net income	$	37,133		$	38,827	$	89,019		$	107,186
Accretion of environmental liabilities	2,435			2,495		7,231			7,799
Depreciation and amortization	34,604			22,892		87,000			67,671
Other (income) loss	(164		)	669		(5,931		)	(2,485		)
Loss on early extinguishment of debt	—			2,294		—			2,294
Interest expense, net	10,927			7,198		28,047			21,772
Provision for income taxes	18,896			24,384		47,283			42,941
Income from discontinued operations, net of tax	—			—		—			(2,794		)
Adjusted EBITDA	$	103,831		$	98,759	$	252,649		$	244,384

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The following reconciles Adjusted EBITDA to cash from operations (in thousands):

	For the Nine Months Ended
	September 30,
	2011			2010
Adjusted EBITDA	$	252,649		$	244,384
Interest expense, net	(28,047		)	(21,772		)
Provision for income taxes	(47,283		)	(42,941		)
Income from discontinued operations, net of tax	—			2,794
Allowance for doubtful accounts	623			163
Amortization of deferred financing costs and debt discount	1,230			2,221
Change in environmental liability estimates	(2,467		)	(5,391		)
Deferred income taxes	(197		)	540
Stock-based compensation	5,329			5,220
Excess tax benefit of stock-based compensation	(1,949		)	(1,221		)
Income tax benefits related to stock option exercises	1,949			1,215
Eminent domain compensation	3,354			—
Gain on sales of businesses	—			(2,678		)
Prepayment penalty on early extinguishment of debt	—			(900		)
Environmental expenditures	(8,551		)	(8,704		)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	(32,670		)	(63,714		)
Other current assets	(14,113		)	(18,456		)
Accounts payable	30,241			47,828
Other current liabilities	(8,762		)	15,342
Net cash from operating activities	$	151,336		$	153,930

Segment data

Performance of our segments is evaluated on several factors of which the primary financial measure is Adjusted EBITDA. The following tables set forth certain operating data associated with our results of operations and summarizes Adjusted EBITDA contribution by operating segment for the three and nine months ended September 30, 2011 and 2010 (in thousands). We consider the Adjusted EBITDA contribution from each operating segment to include revenue attributable to each segment less operating expenses, which include cost of revenues and selling, general and administrative expenses. Revenue attributable to each segment is generally external or direct revenue from third party customers. Certain income or expenses of a non-recurring or unusual nature are not included in the operating segment Adjusted EBITDA contribution. Amounts presented have been recast to reflect the changes made to our segment presentation as a result of the changes made in the first quarter of 2011 in how we manage our business. This table and subsequent discussions should be read in conjunction with Item 6, “Selected Financial Data,” of our Annual Report on Form 10-K for the year ended December 31, 2010 and Item 8, “Financial Statements and Supplementary Data,” and in particular Note 16, “Segment Reporting,” included in our Current Report on Form 8-K filed on July 15, 2011 and Item 1, “Unaudited Financial Statements” and in particular Note 14, “Segment Reporting,” in this report.

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Three months ended September 30, 2011 versus the three months ended September 30, 2010

	Summary of Operations (in thousands)
	For the Three Months Ended September 30,
	2011			2010			$ Change			% Change
Direct Revenues:
Technical Services	$	213,857		$	182,843		$	31,014		17.0	%
Field Services	111,174			174,306			(63,132		)	(36.2	)
Industrial Services	117,866			81,962			35,904			43.8
Oil and Gas Field Services	113,463			49,032			64,431			131.4
Corporate Items	(307		)	(492		)	185			(37.6	)
Total	556,053			487,651			68,402			14.0
Cost of Revenues (exclusive of items shown separately) (1):
Technical Services	136,685			119,737			16,948			14.2
Field Services	81,960			117,569			(35,609		)	(30.3	)
Industrial Services	86,950			58,090			28,860			49.7
Oil and Gas Field Services	77,549			38,647			38,902			100.7
Corporate Items	3,374			1,230			2,144			174.3
Total	386,518			335,273			51,245			15.3
Selling, General & Administrative Expenses:
Technical Services	18,167			16,911			1,256			7.4
Field Services	6,468			8,307			(1,839		)	(22.1	)
Industrial Services	8,239			4,925			3,314			67.3
Oil and Gas Field Services	7,498			(88		)	7,586			8,620.5
Corporate Items	25,332			23,564			1,768			7.5
Total	65,704			53,619			12,085			22.5
Adjusted EBITDA:
Technical Services	59,005			46,195			12,810			27.7
Field Services	22,746			48,430			(25,684		)	(53.0	)
Industrial Services	22,677			18,947			3,730			19.7
Oil and Gas Field Services	28,416			10,473			17,943			171.3
Corporate Items	(29,013		)	(25,286		)	(3,727		)	14.7
Total	$	103,831		$	98,759		$	5,072		5.1	%

_______________________

(1) Items shown separately consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.

Revenues

Technical Services revenues increased17.0%, or $31.0 million in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to changes in product mix and increases in pricing ($10.5 million), increases in volumes being processed through our landfills, treatment, storage and disposal facilities, and waste water treatment plants ($8.0 million), the strengthening of the Canadian dollar ($1.8 million), a slight increase due to an acquisition in August 2011 and an increase in our base business. These increases were partially offset by reductions in volumes being processed through our incinerators and solvent recycling facilities ($1.2 million).

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Field Services revenues decreased36.2%, or $63.1 million, in the three months ended September 30, 2011 from the comparable period in 2010.  Field Services performed emergency response work related to the Yellowstone River oil spill in Montana during the three months ended September 30, 2011 and in the Gulf of Mexico and Michigan during the three months ended September 30, 2010 which accounted for $41.5 million and $123.8 million, respectively, of our third party revenues.  Excluding those oil spill project revenues, Field Services revenues increased for the three months ended September 30, 2011 from the comparable period in 2010 primarily due to our large remedial project business ($3.9 million), our polychlorinated biphenyls (“PCB”) business ($2.9 million), and our oil recycling business due to increased pricing and volumes ($0.7 million).  The remaining increase related primarily to growth in our base business.

Industrial Services revenues increased43.8%, or $35.9 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to an increase in our lodging business ($19.1 million), an increase in shutdown work performed at our refinery customers in Western Canada, the strengthening of the Canadian dollar ($3.4 million), and growth in the oil sands region of Canada. These increases resulted partially from revenues associated with recent acquisitions including Peak in June 2011.

Oil and Gas Field Services revenues increased131.4%, or $64.4 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to fluids handling and surface rentals activity related to the acquisition of Peak in June 2011 ($35.1 million), increased exploration activities partially from revenues associated with an acquisition in July 2011 and from increased oil prices ($18.9 million), and an increase in the energy services business ($14.1 million) offset partially by intersegment expenses incurred.

There are many factors which have impacted, and continue to impact, our revenues. These factors include, but are not limited to: the level of emergency response projects, the general conditions of the oil and gas industries particularly in the Alberta oil sands and other parts of Western Canada, competitive industry pricing, and the effects of fuel prices on our fuel recovery fees.

Cost of Revenues

Technical Services cost of revenues increased14.2%, or $16.9 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to increases in salary and labor expenses ($4.2 million), vehicle and equipment repair costs ($2.7 million), outside disposal and rail costs ($2.6 million), fuel expense ($2.5 million), chemicals and consumables expenses ($1.3 million), turnaround and downtime costs ($1.1 million), materials and supplies costs ($0.9 million), materials for reclaim costs ($0.8 million), equipment rental and leased equipment costs ($0.7 million), subcontractor fees ($0.6 million), and the strengthening of the Canadian dollar ($1.0 million) offset partially by favorable changes in environmental liability estimates ($0.5 million) and a reduction in outside transportation costs ($0.3 million).

Field Services cost of revenues decreased30.3%, or $35.6 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to decreased subcontractor fees, materials and supplies costs, equipment rental costs, travel and other costs associated with our large event business ($46.6 million). This decrease resulted largely from the level of work performed on the Yellowstone oil spill project during the third quarter of 2011 being significantly less than that of the oil spill project business in the Gulf of Mexico and Michigan that occurred during the comparable period of 2010.  Excluding those oil spill project costs, Field Services cost of revenues increased $11.0 million for the three months ended September 30, 2011 from the comparable period in 2010 primarily due to increases in subcontractor fees ($1.7 million), materials and supplies costs ($1.2 million), materials for reclaim or resale ($1.1 million), equipment rental fees ($1.0 million), outside disposal costs ($1.0 million), labor and related expenses ($0.8 million), travel costs ($0.8 million) and fuel costs ($0.7 million).

Industrial Services cost of revenues increased49.7%, or $28.9 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to increased salary and labor expenses ($13.1 million), subcontractor fees ($4.0 million), material and supplies expenses ($3.3 million), catering costs associated with the increased lodging services revenues ($2.8 million), vehicle expenses ($2.1 million), fuel expenses ($1.5 million), travel costs related to the shutdown activity ($0.6 million), and the strengthening of the Canadian dollar ($2.3 million) offset partially by decreases in lease operator expenses due to buyout of leases ($3.7 million). These increases resulted partially from costs associated with recent acquisitions including Peak in June 2011.

Oil and Gas Field Services cost of revenues increased100.7%, or $38.9 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to salary and labor expenses ($17.7 million), materials and supplies costs ($3.2 million), vehicle expenses ($2.8 million), subcontractor fees ($2.7 million), fuel expenses ($2.5 million), travel costs ($2.2 million), equipment repair expenses ($1.9 million), and the strengthening of the Canadian dollar ($2.3 million), offset partially by decreases in lease operator expenses due to buyout of leases ($0.9 million). These increases resulted partially

40

from costs associated with recent acquisitions including Peak in June 2011.

Corporate Items cost of revenues increased$2.1 million for the three months ended September 30, 2011, as compared to the same period in 2010 primarily due to increased health insurance related costs ($0.9 million), materials and supplies costs ($0.5 million) and labor and related costs ($0.4 million). 

 We believe that our ability to manage operating costs is important in our ability to remain price competitive. We continue to upgrade the quality and efficiency of our waste treatment services through the development of new technology and continued modifications and upgrades at our facilities, and implementation of strategic sourcing initiatives. We plan to continue to focus on achieving cost savings relating to purchased goods and services through a strategic sourcing initiative. No assurance can be given that our efforts to reduce future operating expenses will be successful.

Selling, General and Administrative Expenses

Technical Services selling, general and administrative expenses increased7.4%, or $1.3 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to increased salaries and commissions and bonus expense.

Field Services selling, general and administrative expenses decreased22.1%, or $1.8 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to a decrease in commissions and bonus expense.

Industrial Services selling, general and administrative expenses increased67.3%, or $3.3 million, in the three months ended September 30, 2011 from the comparable period in 2010 primarily due to increased salaries, commissions and bonus expense.

Oil and Gas Field Services selling, general and administrative expenses were $7.5 million for the three months ended September 30, 2011, as compared to ($0.1) million for the same period in 2010. The increase was primarily due to the recent acquisitions resulting in increases in salaries, commissions and bonus expense, and due to the recovery in 2010 of $2.2 million of pre-acquisition receivables for which an allowance was previously recorded.

Corporate Items selling, general and administrative expenses increased7.5%, or $1.8 million, for the three months ended September 30, 2011, as compared to the same period in 2010 primarily due to increases in professional fees primarily related to acquisition costs ($1.3 million), salaries and bonuses ($1.0 million), rent expense ($0.7 million), severance costs ($0.6 million), stock-based compensation costs ($0.3 million) and the impact on our balance sheet of the strengthening of the Canadian dollar ($0.3 million), offset partially by a reductions in year-over-year expense associated with employer contribution costs related to U.S. and Canadian retirement savings plans ($1.6 million) and marketing and branding costs ($1.5 million).

Depreciation and Amortization

	Three Months Ended September 30,
	(in thousands)
	2011		2010
Depreciation of fixed assets	$	28,456	$	18,056
Landfill and other amortization	6,148		4,836
Total depreciation and amortization	$	34,604	$	22,892

Depreciation and amortization increased 51.2%, or $11.7 million, in the third quarter of 2011 compared to the same period in 2010. Depreciation of fixed assets increased primarily due to acquisitions and other increased capital expenditures in recent periods. Landfill and other amortization increased primarily due to the increase in other intangibles resulting from recent acquisitions.

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Loss on Early Extinguishment of Debt

During the third quarter of 2010, we recorded a $2.3 million loss on the early extinguishment of debt for the redemption of $30.0 million of our then outstanding $300.0 million senior secured notes.  The loss included a $0.9 million premium and non-cash expenses of $0.7 million related to unamortized financing costs and $0.7 million of unamortized discount.

Interest Expense, Net

	Three Months Ended September 30,
	(in thousands)
	2011			2010
Interest expense	$	11,080		$	7,495
Interest income	(153		)	(297		)
Interest expense, net	$	10,927		$	7,198

Interest expense, net increased $3.7 million in the third quarter of 2011 compared to the same period in 2010. The increase in interest expense was primarily due to the issuance of $250.0 million in senior secured notes in March 2011 and the amendment of our revolving credit facility in May 2011.

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Nine months ended September 30, 2011 versus the nine months ended September 30, 2010

	Summary of Operations (in thousands)
	For the Nine Months Ended September 30,
	2011			2010			$ Change			% Change
Direct Revenues:
Technical Services	$	610,985		$	515,855		$	95,130		18.4	%
Field Services	236,474			374,419			(137,945		)	(36.8	)
Industrial Services	333,865			271,455			62,410			23.0
Oil and Gas Field Services	257,871			153,817			104,054			67.6
Corporate Items	(945		)	(1,360		)	415			(30.5	)
Total	1,438,250			1,314,186			124,064			9.4
Cost of Revenues (exclusive of items shown separately) (1):
Technical Services	394,628			342,580			52,048			15.2
Field Services	175,643			257,596			(81,953		)	(31.8	)
Industrial Services	238,645			193,725			44,920			23.2
Oil and Gas Field Services	189,181			121,314			67,867			55.9
Corporate Items	8,752			4,755			3,997			84.1
Total	1,006,849			919,970			86,879			9.4
Selling, General & Administrative Expenses:
Technical Services	52,401			49,515			2,886			5.8
Field Services	19,239			21,759			(2,520		)	(11.6	)
Industrial Services	23,338			14,801			8,537			57.7
Oil and Gas Field Services	17,182			4,568			12,614			276.1
Corporate Items	66,592			59,189			7,403			12.5
Total	178,752			149,832			28,920			19.3
Adjusted EBITDA:
Technical Services	163,956			123,760			40,196			32.5
Field Services	41,592			95,064			(53,472		)	(56.2	)
Industrial Services	71,882			62,929			8,953			14.2
Oil and Gas Field Services	51,508			27,935			23,573			84.4
Corporate Items	(76,289		)	(65,304		)	(10,985		)	16.8
Total	$	252,649		$	244,384		$	8,265		3.4	%

 _______________________

(1) Items shown separately consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.

Revenues

Technical Services revenues increased18.4%, or $95.1 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to changes in product mix and increases in pricing ($31.6 million), increases in volumes being processed through our landfills, treatment, storage and disposal facilities, incinerators and waste water treatment plants ($23.1 million), the strengthening of the Canadian dollar ($4.4 million), a slight increase due to an acquisition in August 2011 and an increase in our base business. These increases were partially offset by reductions in volumes being processed through our solvent recycling facilities ($1.2 million).

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Field Services revenues decreased36.8%, or $137.9 million, in the nine months ended September 30, 2011 from the comparable period in 2010.  Field Services performed emergency response work related to the Yellowstone River oil spill in Montana during the nine months ended September 30, 2011 and in the Gulf of Mexico and Michigan during the nine months ended September 30, 2010 which accounted for $41.5 million and $232.4 million, respectively, of our third party revenues.  Excluding those oil spill project revenues, Field Services revenues increased for the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to our PCB business ($9.0 million), increases in large remedial project business ($5.8 million), and increases in our oil recycling business due to increased pricing and volumes ($1.7 million), and the strengthening of the Canadian dollar ($0.4 million).

Industrial Services revenues increased23.0%, or $62.4 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to an increase in our lodging business ($24.4 million), an increase in shutdown work performed at our refinery customers in Western Canada ($17.0 million), the strengthening of the Canadian dollar ($10.6 million), and growth in the oil sands region of Canada. These increases resulted partially from revenues associated with recent acquisitions including Peak in June 2011.

Oil and Gas Field Services revenues increased67.6%, or $104.1 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to fluids handling and surface rentals activity related to the acquisition of Peak in June 2011 ($41.3 million), increased exploration activity in North Western Canada generated from the increased price of oil, from revenues associated with an acquisition in July 2011, and the prolonged and seasonably cold winter in Western Canada supporting an extended period of drilling activity ($33.5 million), the benefit of the economic recovery for the energy services business, response to a pipeline break in the High Level, Alberta market and the strengthening of the Canadian dollar ($8.3 million).

There are many factors which have impacted, and continue to impact, our revenues. These factors include, but are not limited to: the level of emergency response projects, the effects of unseasonable weather conditions in the first quarter, the general conditions of the oil and gas industries particularly in the Alberta oil sands and other parts of Western Canada, competitive industry pricing, and the effects of fuel prices on our fuel recovery fees.

Cost of Revenues

Technical Services cost of revenues increased15.2%, or $52.0 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to increases in salary and labor expenses ($11.4 million), fuel expense ($8.2 million), outside transportation costs ($6.5 million), outside disposal and rail expenses ($5.7 million), vehicle expenses and equipment repairs ($4.8 million), materials and supplies costs ($3.6 million), turnaround and downtime costs ($3.4 million), materials for reclaim costs ($3.2 million), chemicals and consumables costs ($2.4 million), equipment rentals and leased equipment costs ($2.1 million), subcontractor, temporary and owner operator fees ($1.4 million), and the strengthening of the Canadian dollar ($2.7 million), offset partially by a year-over-year increase in favorable changes in environmental liability estimates ($0.8 million).

Field Services cost of revenues decreased31.8%, or $82.0 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to decreased subcontractor fees, materials and supplies costs, equipment rental costs, fuel costs, travel and other costs associated with our large event business ($109.3 million). This decrease resulted largely from the level of work performed on the Yellowstone oil spill project during the nine months ended September 30, 2011 being significantly less than that of the oil spill project business in the Gulf of Mexico and Michigan that occurred during the comparable period of 2010.  Excluding those oil spill project costs, Field Services cost of revenues increased $27.3 million for the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to increases in materials for reclaim or resale ($4.5 million), labor and related expenses ($4.3 million), equipment rental fees ($3.0 million), outside disposal costs ($3.0 million), fuel costs ($2.5 million), subcontractor fees ($2.3 million), materials and supplies costs ($2.3 million), travel costs ($1.6 million) and vehicle expenses ($0.7 million).

Industrial Services cost of revenues increased23.2%, or $44.9 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to salary and labor expenses ($28.4 million), vehicle expenses ($6.1 million), catering costs associated with the increased lodging services revenues ($5.3 million), material and supplies expenses ($4.6 million), fuel expenses (4.1 million), travel costs related to the shutdown activity ($2.7 million), subcontractor fees ($2.1 million), chemicals and consumables ($1.5 million), and utilities costs ($1.2 million), and the strengthening of the Canadian dollar ($7.3 million), offset partially by decreases in lease operator expenses due to buyout of leases ($21.2 million). These increases resulted partially from costs associated with recent acquisitions including Peak in June 2011.

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Oil and Gas Field Services cost of revenues increased55.9%, or $67.9 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to increases in salary and labor expenses ($30.7 million), fuel expenses ($7.1 million), vehicle expenses ($6.5 million), subcontractor fees ($4.9 million), materials and supplies costs ($4.0 million), travel costs ($3.6 million), equipment repair expenses ($3.5 million), insurance costs ($1.0 million), and the strengthening of the Canadian dollar ($6.6 million), offset partially by decreases in lease operator expenses due to buyout of leases ($2.6 million) and leased equipment costs ($1.0 million).  These increases resulted partially from costs associated with recent acquisitions including Peak in June 2011.

Corporate Items cost of revenues increased$4.0 million for the nine months ended September 30, 2011, as compared to the same period in 2010 primarily due to increased health insurance related costs ($2.9 million), materials and supplies costs ($0.6 million) and fuel and vehicle expenses ($0.6 million), offset partially by a reduction in insurance costs ($1.0 million).

We believe that our ability to manage operating costs is important in our ability to remain price competitive. We continue to upgrade the quality and efficiency of our waste treatment services through the development of new technology and continued modifications and upgrades at our facilities, and implementation of strategic sourcing initiatives. We plan to continue to focus on achieving cost savings relating to purchased goods and services through a strategic sourcing initiative. No assurance can be given that our efforts to reduce future operating expenses will be successful.

Selling, General and Administrative Expenses

Technical Services selling, general and administrative expenses increased5.8%, or $2.9 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to increased salaries, commissions and bonuses and a year-over-year decrease in favorable changes in environmental liability estimates.

Field Services selling, general and administrative expenses decreased11.6%, or $2.5 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to a decrease in commissions and bonus expense.

Industrial Services selling, general and administrative expenses increased57.7%, or $8.5 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to the recent acquisitions resulting in increases in salaries, commissions and bonus expense and travel costs.

Oil and Gas Field Services selling, general and administrative expenses increased276.1%, or $12.6 million, in the nine months ended September 30, 2011 from the comparable period in 2010 primarily due to the recent acquisitions resulting in increases in salaries, commissions and bonus expense, and due to the recovery in 2010 of $2.2 million of pre-acquisition receivables for which an allowance was previously recorded.

Corporate Items selling, general and administrative expenses increased12.5%, or $7.4 million, for the nine months ended September 30, 2011, as compared to the same period in 2010 primarily due to increases in salaries and bonuses ($2.6 million), professional fees primarily related to acquisition costs ($1.6 million), rent expense ($0.9 million), health insurance related costs ($0.7 million), and year-over-year decrease in favorable changes in environmental liability estimates ($3.0 million), offset partially by a reduction in marketing and branding costs ($1.8 million) and year-over-year severance costs ($0.5 million).

Depreciation and Amortization

	Nine Months Ended September 30,
	(in thousands)
	2011		2010
Depreciation of fixed assets	$	70,410	$	53,917
Landfill and other amortization	16,590		13,754
Total depreciation and amortization	$	87,000	$	67,671

Depreciation and amortization increased 28.6%, or $19.3 million, in the first nine months of 2011 compared to the same period in 2010. Depreciation of fixed assets increased primarily due to acquisitions and other increased capital expenditures in recent periods. Landfill and other amortization increased primarily due to the increase in other intangible assets resulting from recent acquisitions.

45

Other Income (Loss)

Other income (loss) increased $3.4 million in the nine months ended September 30, 2011 compared to the same period in 2010.  Other income in the nine months ended September 30, 2011 included compensation of $3.4 million received from the Santa Clara Valley Transit Authority for the release by eminent domain of certain rail rights in connection with our hazardous waste facility located in San Jose, California, as well as a $1.9 million gain on remeasurement of marketable securities as a result of the Peak acquisition. We remeasured our previously held common shares in Peak at their fair value and recognized the resulting gain in other income. Other income in the nine months ended September 30, 2010 included a gain on sale of certain other marketable securities of $2.4 million.

Loss on Early Extinguishment of Debt

During the third quarter of 2010, we recorded a $2.3 million loss on the early extinguishment of debt for the redemption of $30.0 million of our then outstanding $300.0 million senior secured notes.  The loss included a $0.9 million premium and non-cash expenses of $0.7 million related to unamortized financing costs and $0.7 million of unamortized discount.

Interest Expense, Net

	Nine Months Ended September 30,
	(in thousands)
	2011			2010
Interest expense	$	28,747		$	22,336
Interest income	(700		)	(564		)
Interest expense, net	$	28,047		$	21,772

Interest expense, net increased $6.3 million in the first nine months of 2011 compared to the same period in 2010. The increase in interest expense was primarily due to the issuance of $250.0 million in senior secured notes in March 2011 and the amendment of our revolving credit facility in May 2011.

Income from Discontinued Operations

In connection with our acquisition of Eveready, we agreed with the Canadian Commissioner of Competition to divest Eveready’s Pembina Area Landfill, located near Drayton Valley, Alberta, due to its proximity to our existing landfill in the region. Prior to its sale in April 2010, the Pembina Area Landfill met the held for sale criteria and therefore the fair value of its assets and liabilities less estimated costs to sell were recorded as held for sale in our consolidated balance sheet. In connection with this sale, we recognized a pre-tax gain of $1.3 million which, along with the net income through April 30, 2010 for the Pembina Area Landfill, has been recorded in income from discontinued operations on our consolidated statement of income for the nine months ended September 30, 2011. From January 1, 2010 to April 30, 2010, the Pembina Area Landfill recorded $2.2 million of revenues which are included in income from discontinued operations.

In addition to the above, we sold the mobile industrial health business in the second quarter of 2010 and recognized a $1.4 million pre-tax gain on sale which was recorded in income from discontinued operations.

Income Taxes

The Company’s effective tax rate (including taxes on income from discontinued operations) for the three and nine months ended September 30, 2011 was 33.7% and 34.7%, compared to 38.6% and 29.1% for the same periods in 2010.  The decrease in the effective tax rate for the three months ended September 30, 2011 was primarily attributable to the valuation allowance release that was recorded this quarter.  The increase in the effective tax rate for the nine months ended September 30, 2011 was primarily attributable to the decrease in unrecognized tax benefits recorded in the third quarter of 2010. Excluding this discrete item, the rate decreased 3.6% as compared to the nine months ended September 30, 2010 primarily due to the increased profits attributable to Canada, which has a lower corporate income tax rate as compared to the United States, the recording of an energy investment tax credit for a solar energy project placed in service, and the partial release of a valuation allowance that is associated with the Company's foreign tax credits.

Income tax expense (including taxes on income from discontinued operations) for the three months ended September 30, 2011 decreased $5.5 million to $18.9 million from $24.4 million for the comparable period in 2010. Income tax expense

46

(including taxes on income from discontinued operations) for the nine months ended September 30, 2011 increased $3.3 million to $47.3 million from $44.0 million for the comparable period in 2010.  The decreased tax expense for the three months ended September 30, 2011 was primarily attributable to a valuation allowance release that occurred this quarter. The release is associated with the Company's foreign tax credits. The increased tax expense for the nine months ended September 30, 2011 was primarily attributable to the decrease in unrecognized tax benefits recorded in the third quarter of 2010.

Management’s policy is to recognize interest and penalties related to income tax matters as a component of income tax expense.  The liability for unrecognized tax benefits and related reserves as of September 30, 2011 and December 31, 2010, included accrued interest and penalties of $28.6 million and $26.2 million, respectively.  Tax expense for the each of the three months ended September 30, 2011 and 2010 included interest and penalties of $0.9 million . Tax expense for the nine months ended September 30, 2011 and 2010 included interest and penalties of $2.6 million and $3.2 million, respectively.

Liquidity and Capital Resources

Cash and Cash Equivalents

During the nine months ended September 30, 2011, cash and cash equivalents decreased $45.1 million primarily due to the following:

• On March 24, 2011, we issued $250 million aggregate principal amount of 7.625% senior secured notes due 2016 priced for purposes of resale at 104.5% of the aggregate principal amount;

• In June 2011, we acquired Peak Energy Services Ltd. for a purchase price of approximately $205.1 million, including the assumption of approximately $38.4 million of Peak net debt which we paid in full on the acquisition date.

• During the third quarter of 2011, we completed three acquisitions for a combined cash consideration of approximately $137.6 million.

We intend to use our existing cash and cash equivalents, marketable securities and cash flow from operations to provide for our working capital needs, to fund capital expenditures and for potential acquisitions.  We anticipate that our cash flow provided by operating activities will provide the necessary funds on a short- and long-term basis to meet operating cash requirements.

We had accrued environmental liabilities as of September 30, 2011 of approximately $167.5 million, substantially all of which we assumed in connection with our acquisitions of the CSD assets in September 2002, Teris LLC in 2006, and one of the two solvent recycling facilities we purchased from Safety-Kleen Systems, Inc. in 2008. We anticipate our environmental liabilities will be payable over many years and that cash flow from operations will generally be sufficient to fund the payment of such liabilities when required.

However, events not anticipated (such as future changes in environmental laws and regulations) could require that such payments be made earlier or in greater amounts than currently anticipated, which could adversely affect our results of operations, cash flow and financial condition.

We assess our liquidity in terms of our ability to generate cash to fund our operating, investing and financing activities. Our primary ongoing cash requirements will be to fund operations, capital expenditures, interest payments and investments in line with our business strategy. We believe our future operating cash flows will be sufficient to meet our future operating and investing cash needs. Furthermore, the existing cash balances and the availability of additional borrowings under our revolving credit facility provide additional potential sources of liquidity should they be required.

Cash Flows for the nine months ended September 30, 2011

Cash from operating activities in the first nine months of 2011 was $151.3 million, a decrease of 1.7%, or $2.6 million, compared with cash from operating activities in the first nine months of 2010. The change was primarily the result of a net reduction in certain working capital items and a decrease in income from operations.

Cash used for investing activities in the first nine months of 2011 was $445.6 million, an increase of 518.0% or $373.5 million, compared with cash used for investing activities in the first nine months of 2010.  The increase was due primarily from higher year-over-year costs associated with acquisitions and additions to property, plant and equipment.

47

Cash from financing activities in the first nine months of 2011 was $247.9 million, compared with cash used for financing activities of $34.9 million in the first nine months of 2010. The change was primarily the result of the issuance of $250.0 million aggregate principal amount of 7.625% senior secured notes on March 24, 2011 and redemption of debt in the third quarter of 2010.

Cash Flows for the nine months ended September 30, 2010

Cash from operating activities in the first nine months of 2010 was $153.9 million, an increase of 131.4% or $87.4 million, compared with cash from operating activities in the first nine months of 2009. The change was primarily related to the activity from the two oil spill projects in the Gulf of Mexico and Michigan which resulted in an increase in income from operations and an increase in accounts payable offset by a net increase in accounts receivable.

Cash used for investing activities in the first nine months of 2010 was $72.1 million, a decrease of 28.8% or $29.1 million, compared with cash used for investing activities in the first nine months of 2009.  The decrease resulted primarily from proceeds related to the divestitures of the Pembina Area Landfill and the mobile industrial health business, offset by increased additions to property, plant and equipment.

Cash used for financing activities in the first nine months of 2010 was $34.9 million, compared with cash from financing activities of $2.2 million in the first nine months of 2009. The change was primarily the result of (i) net proceeds of $292.1 million from the August 2009 issuance of senior secured notes, offset by the payment on debt acquired related to the 2009 acquisitions of EnviroSORT Inc. and Eveready and (ii) the difference between the redemption of debt amounts between years.

Financing Arrangements

The financing arrangements and principal terms of our $520.0 million principal amount of senior secured notes which were outstanding at September 30, 2011, and our amended $250.0 million revolving credit facility are discussed further in Note 9, “Financing Arrangements,” to our financial statements included in Item 1 of this report.

As of September 30, 2011, we were in compliance with the covenants of our debt agreements, and we believe it is reasonably likely that we will continue to meet such covenants.

Liquidity Impacts of Uncertain Tax Positions

As discussed in Note 10, “Income Taxes,” to our financial statements included in Item 1 of this report, we have recorded as of September 30, 2011, $68.2 million of unrecognized tax benefits and related reserves, including $22.0 million of potential interest and $6.6 million of potential penalties. These liabilities are classified as “unrecognized tax benefits and other long-term liabilities” in our consolidated balance sheets. We are not able to reasonably estimate when we would make any cash payments to settle these liabilities. However, we believe no material cash payments will be required in the next 12 months.

Auction Rate Securities

As of September 30, 2011, our long-term investments included $4.2 million of available for sale auction rate securities. With the liquidity issues experienced in global credit and capital markets, these auction rate securities have experienced multiple failed auctions and as a result are currently not liquid. The auction rate securities are secured by student loans substantially insured by the Federal Family Education Loan Program, maintain the highest credit rating of AAA, and continue to pay interest according to their stated terms with interest rates resetting generally every 28 days.

We believe we have sufficient liquidity to fund operations and do not plan to sell our auction rate securities in the foreseeable future at an amount below the original purchase value.  In the unlikely event that we need to access the funds that are in an illiquid state, we may not be able to do so without a possible loss of principal until a future auction for these investments is successful, another secondary market evolves for these securities, they are redeemed by the issuer, or they mature. If we were unable to sell these securities in the market or they are not redeemed, we could be required to hold them to maturity. These securities are currently reflected at their fair value utilizing a discounted cash flow analysis or significant other observable inputs. During the three months ended September 30, 2011, we liquidated $1.0 million in auction rate securities at par. As of September 30, 2011, we have recorded an unrealized pre-tax loss of $0.5 million, which we assess as temporary. We will continue to monitor and evaluate these investments on an ongoing basis for other than temporary impairment and record an adjustment to earnings if and when appropriate.

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ITEM 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

In the normal course of business, we are exposed to market risks, including changes in interest rates, certain commodity prices, and certain foreign currency rates, primarily the Canadian dollar. Our philosophy in managing interest rate risk is to borrow at fixed rates for longer time horizons to finance non-current assets and to borrow (to the extent, if any, required) at variable rates for working capital and other short-term needs. We therefore have not entered into derivative or hedging transactions, nor have we entered into transactions to finance off-balance sheet debt. The following table provides information regarding our fixed rate borrowings at September 30, 2011 (in thousands):

	Three Months Remaining
Scheduled Maturity Dates	2011			2012			2013			2014			2015			Thereafter			Total
Senior secured notes	$	—		$	—		$	—		$	—		$	—		$	520,000		$	520,000
Capital lease obligations	4,869			5,253			3,585			2,077			317			—			16,101
	$	4,869		$	5,253		$	3,585		$	2,077		$	317		$	520,000		$	536,101
Weighted average interest rate on fixed rate borrowings	7.6		%	7.6		%	7.6		%	7.6		%	7.6		%	7.6		%

In addition to the fixed rate borrowings described in the above table, we had at September 30, 2011 variable rate instruments that included a revolving credit facility with maximum borrowings of up to $250.0 million (with a $110.0 million sub-limit for letters of credit).

We view our investment in our foreign subsidiaries as long-term; thus, we have not entered into any hedging transactions between any two foreign currencies or between any of the foreign currencies and the U.S. dollar. During 2011, the Canadian subsidiaries transacted approximately 3.6% of their business in U.S. dollars and at any period end have cash on deposit in U.S. dollars and outstanding U.S. dollar accounts receivable related to these transactions. These cash and receivable accounts are vulnerable to foreign currency translation gains or losses. Exchange rate movements also affect the translation of Canadian generated profits and losses into U.S. dollars. Had the Canadian dollar been 10.0% stronger or weaker against the U.S. dollar, we would have reported increased or decreased net income of $0.4 million and $0.8 million for the three months ended September 30, 2011 and 2010, respectively.  Had the Canadian dollar been 10.0% stronger or weaker against the U.S. dollar, we would have reported increased or decreased net income of $1.0 million and $3.3 million for the nine months ended September 30, 2011 and 2010, respectively.

At September 30, 2011, $4.2 million of our noncurrent investments were auction rate securities. While we are uncertain as to when the liquidity issues relating to these investments will improve, we believe these issues will not materially impact our ability to fund our working capital needs, capital expenditures, or other business requirements.

We are subject to minimal market risk arising from purchases of commodities since no significant amount of commodities are used in the treatment of hazardous waste or providing energy and industrial services.

ITEM 4.CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Based on an evaluation under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, as of the end of the period covered by this Quarterly Report, our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) were effective as of September 30, 2011 to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms and is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in the Company’s internal control over financial reporting identified in connection with the evaluation required by paragraph (d) of Exchange Act Rules 13a-15e or 15d-15e that was conducted during the last fiscal quarter

49

that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

However, on June 10, 2011, the Company acquired Peak and during the third quarter of 2011, the Company completed three additional acquisitions. The Company has extended its Section 404 compliance program under the Sarbanes-Oxley Act of 2002 and the applicable rules and regulations under such Act to include Peak and all other acquisitions during the year to date. The Company will report on its assessment of the effectiveness of internal control over financial reporting for the integrated operations as of December 31, 2011.

50

CLEAN HARBORS, INC. AND SUBSIDIARIES

PART II—OTHER INFORMATION

Item 1—Legal Proceedings

See Note 13, “Commitments and Contingencies,” to the financial statements included in Item 1 of this report, which description is incorporated herein by reference.

Item 1A—Risk Factors

Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2010 includes a detailed discussion of risk factors which investors should carefully consider before investing in our securities. The information below updates such discussion with respect to recent changes which have occurred in such risk factors, particularly as a result of our acquisitions during the second and third quarters of 2011 including Peak Energy Services Ltd., or “Peak" acquired on June 10, 2011. In addition, we have added such risk factors related to our issuance on March 24, 2011 of $250.0 million aggregate principal amount of 7.625% senior secured notes, or the “new notes,” and the increase on May 31, 2011 in our revolving credit facility from $120.0 million to $250.0 million. The new notes were issued in addition to the $270.0 million of then outstanding senior notes and are treated as a single class for all purposes including, without limitation, waivers, amendments, redemptions and other offers to purchase. This information should be read in conjunction with the risk factors and other information disclosed in our Annual Report on Form 10-K and this report on Form 10-Q.

Risks Relating to our acquisitions

If we are unable to successfully integrate the businesses and operations of our acquisitions and realize synergies in the expected time frame, our future results would be adversely affected.

Our integration of the businesses and operations of our acquisitions into our business and operations will require implementation of appropriate operations, management and financial reporting systems and controls. We may experience difficulties in effectively implementing these and other systems and integrating these businesses' systems and operations, and the integration process may be costly and time-consuming. The integration of these businesses will require the focused attention of both Clean Harbors’ and their management teams, including a significant commitment of their time and resources. The need for both Clean Harbors’ and their managements to focus on integration matters could have a material and adverse impact on the revenues and operating results of the combined company. The success of the acquisitions will depend, in part, on the combined company’s ability to realize the anticipated benefits from combining the businesses of Clean Harbors and these businesses through cost reductions in overhead, greater efficiencies, increased utilization of support facilities and the adoption of mutual best practices among the companies. To realize these anticipated benefits, however, the businesses of Clean Harbors and these businesses must be successfully combined.

If the combined company is not able to achieve these objectives, the anticipated benefits to us of the acquisitions may not be realized fully or at all or may take longer to realize than expected. It is possible that the integration processes could result in the loss of key employees, as well as the disruption of each company’s ongoing businesses, failure to implement the business plan for the combined businesses, unanticipated issues in integrating manufacturing, logistics, information, communications and other systems, unanticipated changes in applicable laws and regulations, operating risks inherent in our business or inconsistencies in standards, controls, procedures and policies or other unanticipated issues, expenses and liabilities, any or all of which could adversely affect our ability to maintain relationships with our and these businesses' customers and employees or to achieve the anticipated benefits of the acquisitions. These integration matters could have a material adverse effect on our business.

Our acquisitions may expose us to unknown liabilities.

Because we acquired all the outstanding common shares of Peak, and two other acquisitions, our investment in these businesses will be subject to all of their liabilities other than their respective debts which we paid at the time of the acquisition. If there are unknown obligations, including contingent liabilities, our business could be materially and adversely affected. We may learn additional information about these businesses that adversely affects us, such as unknown liabilities, issues relating to internal controls over financial reporting, issues that could affect our ability to comply with the Sarbanes-Oxley Act or issues that could affect our ability to comply with other applicable laws. As a result, our acquisition of these businesses might not be successful. Among other things, if these businesses liabilities are greater than expected, or if there are obligations of which we were not aware of the time of completion of the acquisitions, our business could be materially and adversely affected.

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We may make further acquisitions in the future with the goal of expanding our business. However, we may be unable to complete such transactions and, if completed, such transactions may not improve our business or may pose significant risks and could have a negative effect on our operations.

We have in the past significantly increased the size of our Company and the types of services we offer to our customers through acquisitions. Since December 31, 2005, we have acquired two public companies (Eveready Inc. in July 2009, and Peak Energy Services Ltd. in June 2011) and 13 private companies. We may in the future make additional acquisitions.

Our ability to achieve the benefits from any potential future acquisitions, including cost savings and operating efficiencies, depends in part on our ability to successfully integrate the operations of such acquired businesses with our operations. The integration of acquired businesses and other assets may require significant management time and company resources that would otherwise be available for the ongoing management of our existing operations. While we have had success integrating our prior acquisitions described above, each acquisition presents unique objectives, circumstances and challenges.

Any properties or facilities that we acquire may also be subject to unknown liabilities, such as undisclosed environmental contamination, for which we may have no recourse, or only limited recourse, to the former owners of such properties. As a result, if a liability were asserted against us based upon ownership of an acquired property, we might be required to pay significant sums to settle it, which could adversely affect our financial results and cash flow.

Risks Relating to Our Level of Debt and the Notes

Our substantial levels of outstanding debt and letters of credit could adversely affect our financial condition and ability to fulfill our obligations under the notes.

As of September 30, 2011, after giving effect to our sale of the new notes on March 24, 2011 and payment of related fees and expenses, and the increase on May 31, 2011 in the revolving credit facility to $250.0 million from $120.0 million, we had outstanding $520.0 million of debt and $82.6 million of letters of credit. Our substantial levels of outstanding debt and letters of credit may:

• adversely impact our ability to obtain additional financing in the future for working capital, capital expenditures, acquisitions or other general corporate purposes or to repurchase the notes from holders upon a change of control;

• require us to dedicate a substantial portion of our cash flow to the payment of interest on our debt and fees on our letters of credit, which reduces the availability of our cash flow to fund working capital, capital expenditures, acquisitions and other general corporate purposes;

• subject us to the risk of increased sensitivity to interest rate increases based upon variable interest rates, including our borrowings (if any) under our new revolving credit facility;

• increase the possibility of an event of default under the financial and operating covenants contained in our debt instruments; and

• limit our ability to adjust to rapidly changing market conditions, reduce our ability to withstand competitive pressures and make us more vulnerable to a downturn in general economic conditions of our business than our competitors with less debt.

Our ability to make scheduled payments of principal or interest with respect to our debt, including the notes, any revolving loans and our capital leases, and to pay fee obligations with respect to our letters of credit, will depend on our ability to generate cash and on our future financial results. Our ability to generate cash depends on, among other things, the demand for our services, which is subject to market conditions in the environmental, energy and industrial services industries, the occurrence of events requiring major remedial projects, changes in government environmental regulation, general economic conditions, and financial, competitive, regulatory and other factors affecting our operations, many of which are beyond our control. Our operations may not generate sufficient cash flow, and future borrowings may not be available under our revolving credit facility or otherwise, in an amount sufficient to enable us to pay our debt and fee obligations respecting our letters of credit, or to fund our other liquidity needs. If we are

unable to generate sufficient cash flow from operations in the future to service our debt and letter of credit fee obligations, we might be required to refinance all or a portion of our existing debt and letter of credit facilities or to obtain new or additional such facilities. However, we might not be able to obtain any such new or additional facilities on favorable terms or at all.

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Despite our substantial levels of outstanding debt and letters of credit, we could incur substantially more debt and letter of credit obligations in the future.

Although our revolving credit agreement and the indenture governing the notes contain restrictions on the incurrence of additional indebtedness (including, for this purpose, reimbursement obligations under outstanding letters of credit), these restrictions are subject to a number of qualifications and exceptions and the additional amount of indebtedness which we might incur in the future in compliance with these restrictions could be substantial. In particular, we had available at September 30, 2011 up to an additional approximately $167.4 million for purposes of additional borrowings and letters of credit. The revolving credit agreement and the indenture governing the notes also allow us to borrow significant amounts of money from other sources. These restrictions would also not prevent us from incurring obligations (such as operating leases) that do not constitute “indebtedness” as defined in the relevant agreements. To the extent we incur in the future additional debt and letter of credit obligations, the related risks will increase.

Item 2—Unregistered Sale of Equity Securities and Use of Proceeds—None.

Item 3—Defaults Upon Senior Securities—None.

Item 4—Reserved

Item 5—Other Information—None.

Item 6—Exhibits

Item No.	Description	Location
4.35C	Supplemental Indenture dated as of August 17, 2011 among Clean Harbors, Inc., as Issuer, DuraTherm, Inc., as the new Guarantor, and U.S. Bank National Association, as Trustee and Notes Collateral Agent	Filed herewith
31.1	Rule 13a-14a/15d-14(a) Certification of the CEO Alan S. McKim	Filed herewith
31.2	Rule 13a-14a/15d-14(a) Certification of the CFO James M. Rutledge
32	Section 1350 Certifications	Filed herewith
101	Interactive Data Files Pursuant to Rule 405 of Regulation S-T: Financial statements from the quarterly report on Form 10-Q of Clean Harbors, Inc. for the quarter ended September 30, 2011, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Income, (iii) Unaudited Consolidated Statements of Cash Flows, (iv) Unaudited Consolidated Statements of Stockholders’ Equity, and (v) Notes to Unaudited Consolidated Financial Statements.	*

_______________________

* These interactive data files are furnished and deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

53

CLEAN HARBORS, INC. AND SUBSIDIARIES

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		CLEAN HARBORS, INC.
		Registrant
		By:	/s/  ALAN S. MCKIM
			Alan S. McKim
			President and Chief Executive Officer
Date:	November 9, 2011
		By:	/s/  JAMES M. RUTLEDGE
			James M. Rutledge
			Vice Chairman and Chief Financial Officer
Date:	November 9, 2011

54

EX-4.35C

SUPPLEMENTAL INDENTURE

Supplemental Indenture (this “Supplemental Indenture”), dated as of August 17, 2011, among Clean Harbors, Inc., a Massachusetts corporation (the “Company”), DuraTherm, Inc., a Delaware corporation (the “New Guarantor”), and U.S. Bank National Association, as trustee (the “Trustee”) and Notes Collateral Agent under the Indenture as defined below. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

WITNESSETH

WHEREAS, the Company has heretofore executed and delivered to the Trustee an indenture (the “Indenture”), dated as of August 14, 2009, providing for the issuance of an aggregate principal amount of $520,000,000 of 7⅝%Senior Secured Notes due 2016 (the “Securities”), and substantially all of the Company's Domestic Restricted Subsidiaries have unconditionally guaranteed the Company's obligations under the Securities and the Indenture;

WHEREAS, Sections 4.15 and 4.20(a) of the Indenture provide that under certain circumstances the Company is required to cause any New Domestic Restricted Subsidiary to execute and deliver to the Trustee a supplemental indenture pursuant to which such New Domestic Restricted Subsidiary shall unconditionally guarantee all of the Company's obligations under the Securities and the Indenture on the terms and conditions set forth herein; and

WHEREAS, pursuant to Section 9.1 of the Indenture, the Trustee and Notes Collateral Agent are authorized to execute and deliver this Supplemental Indenture without notice to or consent of any Securityholder;

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the Company, the New Guarantor, and the Trustee and Notes Collateral Agent mutually agree for the benefit of the Holders of the Securities as follows:

1.Agreement to Guarantee. The New Guarantor hereby agrees to unconditionally guarantee all of the Company's obligations under the Securities and the Indenture and that its obligations to the Holders and the Trustee pursuant to this Supplemental Indenture shall be as expressly set forth with respect to all Guarantors in Article XII of the Indenture and in such other provisions of the Indenture as are applicable to all Guarantors, and reference is made to the Indenture for the precise terms of this Supplemental Indenture. The terms of Article XII of the Indenture and such other provisions of the Indenture as are applicable to all Guarantors are incorporated herein by reference.

2.Execution and Delivery of Guarantee.

(a)To evidence its Guarantee set forth in this Supplemental Indenture, the New Guarantor is, contemporaneously with its execution and delivery of this Supplemental Indenture, executing and delivering to the Trustee a Guarantee substantially in the form of Exhibit E to the Indenture. The validity and enforceability of the Guarantee set forth in this Supplemental Indenture and such Guarantee shall not be affected by the fact that it is not affixed to any particular Security.

(b)The New Guarantor hereby agrees that its Guarantee set forth in this Supplemental Indenture and such Guarantee shall remain in full force and effect notwithstanding any failure to endorse

on each Security a notation of such Guarantee.

(c)If an Officer of the New Guarantor whose signature is on this Supplemental Indenture or such Guarantee no longer holds that office at the time the Trustee authenticates any Security on which such Guarantee is endorsed or at any time thereafter, such Guarantor's Guarantee of such Security shall nevertheless be valid.

(d)The delivery of any Security by the Trustee, after the authentication thereof under the Indenture, shall constitute due delivery of the Guarantee set forth in this Supplemental Indenture and such Guarantee on behalf of the New Guarantor.

3.No Recourse Against Others. No Affiliate, director, officer, employee, limited liability company member or stockholder of the Company or any Subsidiary, as such, shall have any liability for any obligations of the Issuer under the Securities or any Guarantee or the Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Securityholder by accepting a Security waives and releases all such liability. Such waiver and release are part of the consideration for the issuance of the Securities.

4.New York Law to Govern. The internal law of the State of New York shall govern and be used to construe this Supplemental Indenture and the Guarantee.

5.Counterparts. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement.

6.Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof.

[remainder of page left intentionally blank]

SIGNATURES

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed all as of the date first written above.

CLEAN HARBORS, INC.

By:  /s/ James M. Rutledge

Name: James M. Rutledge

Title: Executive Vice President, Chief

Financial Officer and Treasurer

NEW GUARANTOR:

DURATHERM, INC.

By:  /s/ James M. Rutledge

Name: James M. Rutledge

Title: Executive Vice President and

   Treasurer

U.S. BANK NATIONAL ASSOCIATION,

as Trustee and Notes Collateral Agent

By:  /s/ Karen R. Beard

Name:Karen R. Beard

Title:Vice President

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

I, Alan S. McKim, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Clean Harbors, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Alan S. McKim

Alan S. McKim

President and Chief Executive Officer

Date: November 9, 2011

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, James M. Rutledge, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Clean Harbors, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ James M. Rutledge

James M. Rutledge

Vice Chairman and Chief Financial Officer

Date: November 9, 2011

EX-32

EXHIBIT 32

CLEAN HARBORS, INC. AND SUBSIDIARIES

CERTIFICATION PURSUANT TO
SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES OXLEY ACT OF 2002

Pursuant to 18 U.S.C. §1350, each of the undersigned certifies that, to his knowledge, this Quarterly Report on Form 10-Q for the period ended September 30, 2011 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and the information contained in this report fairly presents, in all material respects, the financial condition and results of operations of Clean Harbors, Inc.

		By:	/s/  ALAN S. MCKIM
			Alan S. McKim
			President and Chief Executive Officer
Date:	November 9, 2011
		By:	/s/  JAMES M. RUTLEDGE
			James M. Rutledge
			Vice Chairman and Chief Financial Officer
Date:	November 9, 2011

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COMMITMENTS AND CONTINGENCIES (Details)			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended				12 Months Ended	3 Months Ended	12 Months Ended	21 Months Ended	12 Months Ended	1 Months Ended			3 Months Ended	9 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2011 USD ($)	Dec. 31, 2010 USD ($)	Sep. 30, 2011 Legal and Administrative Proceedings USD ($)	Dec. 31, 2010 Legal and Administrative Proceedings USD ($)	Sep. 30, 2011 Ville Mercier CAD Municipalities	Dec. 31, 1999 Ville Mercier Municipalities	Dec. 31, 1968 Ville Mercier Permits	Sep. 30, 2011 Ville Mercier USD ($)	Dec. 31, 2010 Ville Mercier USD ($)	Dec. 31, 2006 Deer Trail, Colorado Facility Lawsuits	Sep. 30, 2011 Superfund Proceedings Sites	Dec. 31, 2002 Superfund Proceedings Sites	May 31, 2006 Superfund Proceedings Sites	Dec. 31, 2002 Wichita Property A	May 31, 2007 Casmalia Site Sites	Sep. 30, 2011 Marine Shale Site USD ($)	Dec. 31, 2010 Marine Shale Site USD ($)	Sep. 30, 2011 Certain Other Third Party Sites USD ($) Sites	Sep. 30, 2011 Federal and State Enforcement Actions USD ($) Proceedings	Dec. 31, 2010 Federal and State Enforcement Actions Proceedings	Sep. 30, 2011 Other Contingencies USD ($)	Dec. 31, 2010 Other Contingencies USD ($)
Legal and Administrative Proceedings
Reserves relating to legal and administrative proceedings	$ 29,200,000	$ 29,700,000	$ 26,600,000
Reserves relating to legal and administrative proceedings																			2,600,000
Possible increase in legal and administrative proceedings			2,600,000	2,800,000
Number of permits issued by government, for dumping organic liquid							2
Number of neighboring municipalities filing separate legal proceedings against the Mercier Subsidiary and the Government of Quebec						3
Number of municipalities filing separate legal proceedings, total					4
Damages claimed by municipalities					1,600,000
Suit against alleged past costs					17,400,000
Accrued remedial liabilities	134,996,000	137,613,000						13,400,000	13,500,000
Number of lawsuits filed										2
Superfund Proceedings
Number of sites subject to proceedings under federal or state superfund laws											63
Number of sites owned by the entity subject to proceedings under federal or state superfund laws											2
Number of sites owned by third parties subject to proceedings under federal or state Superfund laws												61
Third party sites arising out of acquisition of assets												35
Third party sites requiring expenditure on remediation											11
Third party sites requiring expenditure on remediation being contested by the entity											1
Number of sites for which environmental remediation expense is settled											10
Number of sites for which environmental remediation expense is not required											14
Number of sites owned by third party excluded from cleanup or related liabilities											2
State-designated superfund site acquired, total acres														1,400
Notices received from owners of third party sites seeking indemnification from the company													5
Third party sites where EPA requested information on prior owner															1
Remaining reserves relating to listed third party sites																3,900,000	3,800,000
Indemnification agreement with third party sites																		14
Additional cleanup liabilities, maximum																		100,000
Federal and State Enforcement Actions
Number of proceedings relating to waste treatment																			1	3
Sanctions relating to waste treatment																			100,000
Loss Contingency, Claims Settled and Dismissed, Number																			2
Other Contingencies
Payment to acquire minority interest in a privately-held company																						10,500,000
Proceeds from irrevocable call right exercised by the privately-held company on shares held																					10,500,000
Prepaid Expense and Other Assets, Current																					$ 10,500,000	$ 10,500,000

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Statement of Financial Position [Abstract]
Accounts receivable, allowances aggregating	$ 14,285	$ 23,704
Permits and other intangibles, accumulated amortization	68,531	60,633
Closure and post-closure liabilities, current portion	5,086	5,849
Remedial liabilities, current portion	$ 10,813	$ 8,669
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, Authorized shares (in shares)	80,000,000	80,000,000
Common stock, issued shares (in shares)	53,038,399	52,772,392
Common stock, outstanding shares (in shares)	53,038,399	52,772,392

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues	$ 556,053	$ 487,651	$ 1,438,250	$ 1,314,186
Cost of revenues (exclusive of items shown separately below)	386,518	335,273	1,006,849	919,970
Selling, general and administrative expenses	65,704	53,619	178,752	149,832
Accretion of environmental liabilities	2,435	2,495	7,231	7,799
Depreciation and amortization	34,604	22,892	87,000	67,671
Income from operations	66,792	73,372	158,418	168,914
Other income (loss)	164	(669)	5,931	2,485
Loss on early extinguishment of debt	0	(2,294)	0	(2,294)
Interest expense, net of interest income of $153 and $700 for the quarter and year-to-date ended 2011 and $297 and $564 for the quarter and year-to-date ended 2010, respectively	(10,927)	(7,198)	(28,047)	(21,772)
Income from continuing operations, before provision for income taxes	56,029	63,211	136,302	147,333
Provision for income taxes	18,896	24,384	47,283	42,941
Income from continuing operations	37,133	38,827	89,019	104,392
Income from discontinued operations, net of tax				2,794
Net income	$ 37,133	$ 38,827	$ 89,019	$ 107,186
Earnings per share:
Basic (in dollars per share)	$ 0.70	$ 0.74	$ 1.68	$ 2.04
Diluted (in dollars per share)	$ 0.70	$ 0.73	$ 1.67	$ 2.03
Weighted average common shares outstanding (in shares)	53,023	52,658	52,921	52,581
Weighted average common shares outstanding plus potentially dilutive common shares (in shares)	53,370	52,963	53,298	52,852

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Details 2) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009
ASSETS
Cash and cash equivalents	$ 257,159	$ 302,210	$ 280,916	$ 233,546
Intercompany receivables	0	0
Other current assets	569,111	450,327
Property, plant and equipment, net	880,719	655,394
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Other long-term assets	303,396	194,544
Total assets	2,010,385	1,602,475
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	393,568	306,284
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	151,603	161,774
Long-term obligations	524,590	264,007
Capital lease obligations, net	7,531	6,839
Intercompany debt payable	0	0
Other long-term liabilities	92,887	82,744
Total liabilities	1,170,179	821,648
Stockholders' equity	840,206	780,827
Total liabilities and stockholders' equity	2,010,385	1,602,475
Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	91,557	100,476	110,939	141,338
Intercompany receivables	346,750	371,559
Other current assets	15,139	15,521
Property, plant and equipment, net	0	0
Investments in subsidiaries	1,002,994	628,723
Intercompany debt receivable	0	0
Other long-term assets	16,327	7,768
Total assets	1,472,767	1,124,047
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	39,568	13,935
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	524,590	264,007
Capital lease obligations, net	0	0
Intercompany debt payable	3,701	3,701
Other long-term liabilities	64,702	61,577
Total liabilities	632,561	343,220
Stockholders' equity	840,206	780,827
Total liabilities and stockholders' equity	1,472,767	1,124,047
U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	145,150	124,582	113,560	50,408
Intercompany receivables	0	0
Other current assets	329,710	279,895
Property, plant and equipment, net	389,481	302,028
Investments in subsidiaries	377,275	259,294
Intercompany debt receivable	443,819	368,804
Other long-term assets	115,352	87,888
Total assets	1,800,787	1,422,491
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	208,021	201,384
Intercompany payables	495,568	222,750
Closure, post-closure and remedial liabilities, net	131,490	141,280
Long-term obligations	0	0
Capital lease obligations, net	573	249
Intercompany debt payable	0	0
Other long-term liabilities	8,326	2,531
Total liabilities	843,978	568,194
Stockholders' equity	956,809	854,297
Total liabilities and stockholders' equity	1,800,787	1,422,491
Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	20,452	77,152	56,417	41,800
Intercompany receivables	148,818	0
Other current assets	224,262	154,911
Property, plant and equipment, net	491,238	353,366
Investments in subsidiaries	94,626	91,654
Intercompany debt receivable	3,701	3,701
Other long-term assets	171,717	98,888
Total assets	1,154,814	779,672
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	145,979	90,965
Intercompany payables	0	148,809
Closure, post-closure and remedial liabilities, net	20,113	20,494
Long-term obligations	0	0
Capital lease obligations, net	6,958	6,590
Intercompany debt payable	443,819	368,804
Other long-term liabilities	19,859	18,636
Total liabilities	636,728	654,298
Stockholders' equity	518,086	125,374
Total liabilities and stockholders' equity	1,154,814	779,672
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0
Intercompany receivables	(495,568)	(371,559)
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(1,474,895)	(979,671)
Intercompany debt receivable	(447,520)	(372,505)
Other long-term assets	0	0
Total assets	(2,417,983)	(1,723,735)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(495,568)	(371,559)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Capital lease obligations, net	0	0
Intercompany debt payable	(447,520)	(372,505)
Other long-term liabilities	0	0
Total liabilities	(943,088)	(744,064)
Stockholders' equity	(1,474,895)	(979,671)
Total liabilities and stockholders' equity	$ (2,417,983)	$ (1,723,735)

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SUBSEQUENT EVENT

9 Months Ended

Sep. 30, 2011

Subsequent Events [Abstract]

SUBSEQUENT EVENT

SUBSEQUENT EVENT

On November 2, 2011, the Company announced that it expects to temporarily idle the hazardous waste incinerator in Ville Mercier, Quebec, for approximately eighteen months from the beginning of the first quarter of 2012. Factors influencing the decision include uncertainties over the local economic environment and the Company's ability to transfer waste streams to its other facilities. The Company has performed an analysis of the long-lived assets and concluded that there was no impairment from the temporary idling of the incinerator. The Company will continue to monitor for impairment as necessary. The Company expects to recognize idling costs and severance costs in the fourth quarter of 2011 which in the aggregate are not material.

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Document and Entity Information	9 Months Ended
	Sep. 30, 2011	Nov. 03, 2011
Document and Entity Information[Abstract]
Entity Registrant Name	CLEAN HARBORS INC
Entity Central Index Key	0000822818
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		53,061,946
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2

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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Numerator for basic and diluted earnings per share:
Income from continuing operations	$ 37,133	$ 38,827	$ 89,019	$ 104,392
Income from discontinued operations				2,794
Net income	$ 37,133	$ 38,827	$ 89,019	$ 107,186
Denominator:
Basic shares outstanding (in shares)	53,023,000	52,658,000	52,921,000	52,581,000
Dilutive effect of equity-based compensation awards (in shares)	347,000	305,000	377,000	271,000
Dilutive shares outstanding (in shares)	53,370,000	52,963,000	53,298,000	52,852,000
Basic earnings per share:
Income from continuing operations (in dollars per share)	$ 0.70	$ 0.74	$ 1.68	$ 1.99
Income from discontinued operations, net of tax (in dollars per share)				$ 0.05
Net income (in dollars per share)	$ 0.70	$ 0.74	$ 1.68	$ 2.04
Diluted earnings per share:
Income from continuing operations (in dollars per share)	$ 0.70	$ 0.73	$ 1.67	$ 1.98
Income from discontinued operations, net of tax (in dollars per share)				$ 0.05
Net income (in dollars per share)	$ 0.70	$ 0.73	$ 1.67	$ 2.03
Authorized stock split declared, number of shares per each share held			2
Outstanding performance stock awards
Antidilutive securities
Antidilutive securities not included in calculation of earnings per share (in shares)	73,000	170,000	73,000	170,000
Stock options
Antidilutive securities
Antidilutive securities not included in calculation of earnings per share (in shares)		36,000		36,000

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BUSINESS COMBINATIONS (Tables)

9 Months Ended

Sep. 30, 2011

Other Acquisitions

Business Acquisition [Line Items]

Summary of the preliminary purchase price for Peak at the acquisition date

The following table summarizes the preliminary aggregate purchase price for the current period acquisitions at their acquisition dates (in thousands of U.S. dollars).

Cash consideration	$	112,450
Debt assumed and paid-off on acquisition date	25,183
Estimated net amount due to the sellers for working capital adjustments	6,524
Total estimated purchase price	$	144,157

Summary of recognized amounts of identifiable assets acquired and liabilities assumed

The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands). The fair value of all the acquired identifiable assets and liabilities summarized below is provisional pending finalization of the Company's acquisition accounting.

	At the Acquisition Dates (As reported at September 30, 2011)
Current assets (i)	$	40,028
Property, plant and equipment	60,109
Customer relationships and other intangibles	23,371
Other assets	196
Current liabilities	(19,522		)
Asset retirement obligations and remedial liabilities	(193		)
Other liabilities	(4,469		)
Total identifiable net assets	99,520
Goodwill (ii)	44,637
Total	$	144,157

(i) The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million.

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $16.3 million, $12.8 million and $15.5 million has been assigned to the Oil and Gas Field Services segment, the Technical Services segment, and the Industrial Services segment, respectively. Certain amounts will not be deductible for tax purposes.

Unaudited pro forma combined summary data as if Peak had been acquired at the beginning of the periods presented

The following unaudited pro forma combined summary data presents information as if the current period acquisitions had been acquired at the beginning of 2010 and 2011 and assumes that there were no material, non-recurring pro forma adjustment directly attributable to the acquisitions. The pro forma information does not necessarily reflect the actual results that would have occurred had the Company and those three acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Pro forma combined revenues	$	575,010	$	513,253	$	1,545,216	$	1,392,234
Pro forma combined net income	$	35,822	$	36,496	$	93,372	$	102,460

Peak Energy Services Ltd.'s (Peak) [Member]

Business Acquisition [Line Items]

Summary of the preliminary purchase price for Peak at the acquisition date

The following table summarizes the preliminary purchase price for Peak at the acquisition date (in thousands of U.S. dollars).

Cash paid for Peak common shares	$	162,585
Fair value of previously owned common shares (1)	4,117
Peak net debt assumed (2)	38,431
Total estimated purchase price	$	205,133

_______________________

(1) The Company previously owned a 3.15% interest in Peak which was recorded in marketable securities. On June 10, 2011, the Company acquired the remaining outstanding shares of Peak and as a result, the Company remeasured the fair value of its previously held common shares and recognized the resulting gain of $1.9 million in other income. The unrealized gain on the Peak investment was previously recorded in accumulated other comprehensive income. For this purpose, the fair value of the Company’s previous investment in Peak was deemed to be $4.1 million, calculated based on the closing price of Peak’s shares on the Toronto Stock Exchange on the date before the acquisition was publicly announced.

(2) The outstanding Peak debt, net of $15.7 million of cash assumed, which consisted of three term loan facilities, was paid off on June 10, 2011.

Summary of recognized amounts of identifiable assets acquired and liabilities assumed

The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands). The fair value of all the acquired identifiable assets and liabilities summarized below is provisional pending finalization of the Company's acquisition accounting. Measurement period adjustments reflect new information obtained about facts and circumstances that existed as of the acquisition date. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed but the Company is waiting for additional information necessary to finalize fair value. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one year from the acquisition date. Final determination of the fair value may result in further adjustments to the values presented below.

	June 10, 2011 (As reported at June 30, 2011)			Measurement Period Adjustments			June 10, 2011 (As adjusted)
Current assets (i)	$	45,797		$	(811	)	$	44,986
Property, plant and equipment	149,344			921			150,265
Identifiable intangible assets	14,107			(921		)	13,186
Other assets	8,800			(7,691		)	1,109
Current liabilities	(27,717		)	(643		)	(28,360		)
Asset retirement obligations	—			(103		)	(103		)
Other liabilities	(8,344		)	218			(8,126		)
Total identifiable net assets	$	181,987		$	(9,030	)	$	172,957
Goodwill (ii)	23,146			9,030			32,176
Total	$	205,133		$	—		$	205,133

_______________________

(i) The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary fair value of $33.3 million. The gross amount due was $34.7 million.

(ii) Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $13.0 million and $19.2 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectively; however, the amount and the allocation are subject to change pending the finalization of the Company’s valuation.

Unaudited pro forma combined summary data as if Peak had been acquired at the beginning of the periods presented

The following unaudited pro forma combined summary data presents information as if Peak had been acquired at the beginning of 2010 and 2011 and assumes that there was no material, non-recurring pro forma adjustment directly attributable to the acquisition. The pro forma information does not necessarily reflect the actual results that would have occurred had the Company and Peak been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Pro forma combined revenues	$	560,130	$	527,425	$	1,537,520	$	1,422,979
Pro forma combined net income	$	37,558	$	41,378	$	91,295	$	103,795

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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Income Tax Disclosure [Abstract]
The Company's effective tax rate (including taxes on income from discontinued operations) (as a percent)	33.70%	38.60%	34.70%	29.10%
Decrease in effective income tax rate			3.60%
Unrecognized tax benefits and related reserves including interest and penalties	$ 68.2		$ 68.2		$ 65.9
Unrecognized tax benefits, interest	22.0		22.0		19.7
Unrecognized tax benefits, penalties	6.6		6.6		6.5
Anticipated decrease in unrecognized tax benefits (including interest and penalties) in the next twelve months	(5.9)		(5.9)
Anticipated decrease in interest and penalties included in unrecognized tax benefits, in the next twelve months	$ 2.5		$ 2.5

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GOODWILL AND OTHER INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2011

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER INTANGIBLE ASSETS

GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the nine months ended September 30, 2011 were as follows (in thousands):

	2011
Balance at January 1, 2011	$	60,252
Acquired from acquisitions	80,394
Foreign currency translation	(5,950		)
Balance at September 30, 2011	$	134,696

The increase in goodwill during the nine months ended September 30, 2011 was primarily attributed to the recent acquisitions. The goodwill related to these acquisitions includes estimates that are subject to change based upon final fair value determinations. Below is a summary of amortizable other intangible assets (in thousands):

	September 30, 2011							December 31, 2010
	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)
Permits	$	106,504	$	44,569	$	61,935	18.0	$	103,493	$	42,430	$	61,063	15.9
Customer relationships	82,206		15,234		66,972		8.2	58,322		10,418		47,904		8.0
Other intangible assets	20,791		8,728		12,063		4.7	13,218		7,785		5,433		3.5
	$	209,501	$	68,531	$	140,970	14.1	$	175,033	$	60,633	$	114,400	9.4

The aggregate amortization expense for the three and nine months ended September 30, 2011 was $3.2 million and $8.7 million, respectively. The aggregate amortization expense for the three and nine months ended September 30, 2010 was $2.8 million and $8.0 million respectively.

The increase in customer relationships and other intangible assets was primarily attributed to the recent acquisitions. Amounts are provisional and subject to change upon completion of final valuations. The total amounts assigned and the weighted average amortization period by major intangible asset classes as it relates to these acquisitions as of September 30, 2011, are as follows:

	Peak Total Amount Assigned		Peak Weighted Average Amortization Period (in years)	Other Acquisitions Total Amount Assigned		Other Acquisitions Weighted Average Amortization Period (in years)
Customer relationships	$	9,246	6.7	$	16,556	15.0
Other intangibles	3,069		5.9	2,953		14.1
	$	12,315	6.5	$	19,509	14.9

Below is the expected future amortization for the net carrying amount of finite lived intangible assets at September 30, 2011 (in thousands):

Years Ending December 31,	Expected Amortization
2011 (three months)	$	4,028
2012	13,466
2013	12,927
2014	12,302
2015	11,678
Thereafter	86,569
	$	140,970

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FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value Disclosures [Abstract]

Fair value of assets measured on a recurring basis

The Company’s assets measured at fair value on a recurring basis at September 30, 2011 and December 31, 2010 were as follows (in thousands):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2011
Auction rate securities	$	—	$	—	$	4,239	$	4,239
Marketable securities	$	93	$	—	$	—	$	93

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2010
Auction rate securities	$	—	$	—	$	5,437	$	5,437
Marketable securities	$	3,174	$	—	$	—	$	3,174

Changes in auction rate securities measured at fair value on a recurring basis

The following tables present the changes in the Company’s auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and nine months ended September 30, 2011 and 2010 (in thousands):

	Three Months Ended
	September 30,
	2011			2010
Balance at July 1,	$	5,311		$	5,315
Sale of auction rate securities	(1,000		)	—
Unrealized (losses) gains included in other comprehensive income	(72		)	115
Balance at September 30,	$	4,239		$	5,430

	Nine Months Ended
	September 30,
	2011			2010
Balance at January 1,	$	5,437		$	6,503
Sale of auction rate securities	(1,000		)	(1,300		)
Unrealized (losses) gains included in other comprehensive income	(198		)	227
Balance at September 30,	$	4,239		$	5,430

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ACCRUED EXPENSES (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Accrued Expenses [ABSTRACT]
Insurance	$ 21,886	$ 19,736
Interest	5,222	7,826
Accrued disposal costs	2,238	2,173
Accrued compensation and benefits	47,277	44,545
Income, real estate, sales and other taxes	24,637	19,529
Other	37,651	22,280
Total accrued expenses	$ 138,911	$ 116,089

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SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Property, Plant and Equipment (excluding landfill assets):
Interest capitalized to fixed assets	$ 0.4	$ 0.3
Depreciation and amortization expense, property, plant and equipment	$ 70.4	$ 53.9
Buildings
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, minimum (in years)	30
Estimated useful life, maximum (in years)	40
Land, leasehold and building improvements
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, minimum (in years)	5
Estimated useful life, maximum (in years)	40
Weighted average life (in years)	8.3
Camp Equipment
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, minimum (in years)	12
Estimated useful life, maximum (in years)	15
Vehicles
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, minimum (in years)	3
Estimated useful life, maximum (in years)	12
Capitalized software and computer equipment
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, maximum (in years)	3
Solar equipment
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, maximum (in years)	20
Containers and railcars
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, minimum (in years)	15
Estimated useful life, maximum (in years)	20
All other equipment
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, minimum (in years)	3
Estimated useful life, maximum (in years)	10
Furniture and fixtures
Property, Plant and Equipment (excluding landfill assets):
Estimated useful life, minimum (in years)	5
Estimated useful life, maximum (in years)	8

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SIGNIFICANT ACCOUNTING POLICIES (Tables)

9 Months Ended

Sep. 30, 2011

Accounting Policies [Abstract]

Schedule of asset classification and estimated useful life

The Company depreciates the cost of these assets, using the straight-line method as follows:

Asset Classification	Estimated Useful Life
Buildings and building improvements
Buildings	30—40 years
Land, leasehold and building improvements	5—40 years
Camp equipment	12—15 years
Vehicles	3—12 years
Equipment
Capitalized software and computer equipment	3 years
Solar equipment	20 years
Containers and railcars	15—20 years
All other equipment	3—10 years
Furniture and fixtures	5—8 years

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INCOME TAXES

9 Months Ended

Sep. 30, 2011

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company’s effective tax rate (including taxes on income from discontinued operations) for the three and nine months ended September 30, 2011 was 33.7 percent and 34.7 percent, respectively, compared to 38.6 percent and 29.1 percent, respectively, for the same periods in 2010. The decrease in the effective tax rate for the three months ended September 30, 2011 was primarily attributable to the valuation allowance release that was recorded during the current quarter. The increase in the effective tax rate for the nine months ended September 30, 2011 was primarily attributable to the decrease in unrecognized tax benefits recorded in the third quarter of 2010. Excluding this discrete item, the rate decreased by 3.6% as compared to the nine months ended September 30, 2010, primarily due to the increased profits attributable to Canada, which has a lower corporate income tax rate as compared to the United States, the recording of an energy investment tax credit for a solar energy project placed in service, and the partial release of a valuation allowance that is associated with the Company's foreign tax credits.

As of September 30, 2011, the Company’s unrecognized tax benefits and related reserves were $68.2 million, which included $22.0 million of interest and $6.6 million of penalties. As of December 31, 2010, the Company’s unrecognized tax benefits and related reserves were $65.9 million, which included $19.7 million of interest and $6.5 million of penalties.

Due to expiring statute of limitation periods, the Company anticipates that total unrecognized tax benefits and related reserves, other than adjustments for additional accruals for interest and penalties and foreign currency translation, will decrease by approximately $5.9 million within the next twelve months.  The $5.9 million (which includes interest and penalties of $2.5 million) is primarily related to a historical Canadian business combination and, if realized, will be recorded in earnings and therefore will impact the effective income tax rate.

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BASIS OF PRESENTATION

9 Months Ended

Sep. 30, 2011

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION

BASIS OF PRESENTATION

The accompanying consolidated interim financial statements include the accounts of Clean Harbors, Inc. and its subsidiaries (collectively, “Clean Harbors” or the “Company”) and have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) and, in the opinion of management, include all adjustments which are of a normal recurring nature, necessary for a fair presentation of the financial position, results of operations, and cash flows for the periods presented. The results for interim periods are not necessarily indicative of results for the entire year or any other interim periods. The financial statements presented herein should be read in connection with the financial statements included in the Company’s Current Report on Form 8-K filed on July 15, 2011.

On June 8, 2011, the Company’s Board of Directors authorized a two-for-one stock split of the Company’s common stock in the form of a stock dividend of one share for each outstanding share. The stock dividend was paid on July 26, 2011 to holders of record at the close of business on July 6, 2011. The stock split followed the approval, at the Company’s 2011 annual meeting of stockholders, of a proposal to increase the Company’s authorized shares of common stock from 40 million to 80 million. The stock split did not change the proportionate interest that a stockholder maintained in the Company. All share and per share information, including options, restricted and performance stock awards, stock option exercises, employee stock purchase plan purchases, common stock and additional paid-in capital accounts on the consolidated balance sheets and consolidated statements of income and stockholders’ equity, have been retroactively adjusted to reflect the two-for-one stock split. In addition, awards granted and weighted average fair value of awards granted in Note 12, “Stock-Based Compensation,” have also been retroactively adjusted.

During the quarter ended March 31, 2011, the Company re-aligned its management reporting structure. Under the new structure, the Company’s operations are managed in four segments: Technical Services, Field Services, Industrial Services and Oil and Gas Field Services. The new segment, Oil and Gas Field Services, consists of the previous Exploration Services segment, as well as certain departments that were re-assigned from the Industrial Services segment. In addition, certain departments from the Field Services segment were re-assigned to the Industrial Services segment. Accordingly, the Company re-aligned and re-allocated departmental costs being allocated among the segments to support these management reporting changes. The Company has recast the segment information to conform to the current year presentation. See Note 14, “Segment Reporting.”

The four operating segments consist of:

• Technical Services — provides a broad range of hazardous material management services including the packaging, collection, transportation, treatment and disposal of hazardous and non-hazardous waste at Company owned incineration, landfill, wastewater, and other treatment facilities.

• Field Services — provides a wide variety of environmental cleanup services on customer sites or other locations on a scheduled or emergency response basis including tank cleaning, decontamination, remediation, and spill cleanup.

• Industrial Services — provides industrial and specialty services, such as high-pressure and chemical cleaning, catalyst handling, decoking, material processing, surface rentals and industrial lodging services to refineries, chemical plants, oil sands facilities, pulp and paper mills, and other industrial facilities.

• Oil and Gas Field Services — provides fluid handling, fluid hauling, down hole servicing, surface rentals, exploration, mapping and directional boring services to the energy sector serving oil and gas exploration, production, and power generation.

Technical Services and Field Services are included as part of Clean Harbors Environmental Services, and Industrial Services and Oil and Gas Field Services are included as part of Clean Harbors Energy and Industrial Services.

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SEGMENT REPORTING (Tables)

9 Months Ended

Sep. 30, 2011

Segment Reporting [Abstract]

Reconciliation of third party revenues to direct revenues

The following table reconciles third party revenues to direct revenues for the three- and nine-month periods ended September 30, 2011 and 2010 (in thousands). Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is the revenue allocated to the segment performing the provided service. The Company analyzes results of operations based on direct revenues because the Company believes that these revenues and related expenses best reflect the manner in which operations are managed.

	For the Three Months Ended September 30, 2011
	Technical Services		Field Services (1)			Industrial Services		Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	209,245	$	117,448		$	113,543	$	115,554		$	263		$	556,053
Intersegment revenues, net	4,612		(6,274		)	4,323		(2,091		)	(570		)	—
Direct revenues	$	213,857	$	111,174		$	117,866	$	113,463		$	(307	)	$	556,053

	For the Three Months Ended September 30, 2010
	Technical Services		Field Services (2)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	177,266	$	183,120		$	79,723	$	47,503	$	39		$	487,651
Intersegment revenues, net	5,577		(8,814		)	2,239		1,529		(531		)	—
Direct revenues	$	182,843	$	174,306		$	81,962	$	49,032	$	(492	)	$	487,651

	For the Nine Months Ended September 30, 2011
	Technical Services		Field Services (1)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	597,022	$	252,322		$	333,502	$	254,805	$	599		$	1,438,250
Intersegment revenues, net	13,963		(15,848		)	363		3,066		(1,544		)	—
Direct revenues	$	610,985	$	236,474		$	333,865	$	257,871	$	(945	)	$	1,438,250

	For the Nine Months Ended September 30, 2010
	Technical Services		Field Services (2)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	498,202	$	396,496		$	270,847	$	148,666	$	(25	)	$	1,314,186
Intersegment revenues, net	17,653		(22,077		)	608		5,151		(1,335		)	—
Direct revenues	$	515,855	$	374,419		$	271,455	$	153,817	$	(1,360	)	$	1,314,186

_______________________

(1) During the three and nine months ended September 30, 2011, third party revenues for the Field Services segment included revenues associated with the Yellowstone River oil spill response efforts of $41.5 million.

(2) During the three and nine months ended September 30, 2010, third party revenues for the Field Services segment included revenues associated with the oil spill response efforts in the Gulf of Mexico and Michigan of $123.8 million and $232.4 million, respectively.

Reconciliation to consolidated statements of income to adjusted EBITDA

The following table presents information used by management by reported segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, and other income to segments.

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2011			2010			2011			2010
Adjusted EBITDA:
Technical Services	$	59,005		$	46,195		$	163,956		$	123,760
Field Services	22,746			48,430			41,592			95,064
Industrial Services	22,677			18,947			71,882			62,929
Oil and Gas Field Services	28,416			10,473			51,508			27,935
Corporate Items	(29,013		)	(25,286		)	(76,289		)	(65,304		)
Total	$	103,831		$	98,759		$	252,649		$	244,384
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	$	2,435		$	2,495		$	7,231		$	7,799
Depreciation and amortization	34,604			22,892			87,000			67,671
Income from operations	66,792			73,372			158,418			168,914
Other (income) loss	(164		)	669			(5,931		)	(2,485		)
Loss on early extinguishment of debt	—			2,294			—			2,294
Interest expense, net of interest income	10,927			7,198			28,047			21,772
Income from continuing operations before provision for income taxes	$	56,029		$	63,211		$	136,302		$	147,333

PP&E and intangible assets by segment

The following table presents assets by reported segment and in the aggregate (in thousands):

	September 30, 2011		December 31, 2010
Property, plant and equipment, net
Technical Services	$	292,652	$	259,582
Field Services	36,130		32,311
Industrial Services	231,979		180,781
Oil and Gas Field Services	278,546		151,244
Corporate Items	41,412		31,476
Total property, plant and equipment, net	$	880,719	$	655,394
Intangible assets:
Technical Services
Goodwill	$	45,965	$	33,448
Permits and other intangibles, net	79,509		66,075
Total Technical Services	125,474		99,523
Field Services
Goodwill	3,088		3,088
Permits and other intangibles, net	3,331		3,651
Total Field Services	6,419		6,739
Industrial Services
Goodwill	45,941		10,934
Permits and other intangibles, net	20,531		17,906
Total Industrial Services	66,472		28,840
Oil and Gas Field Services
Goodwill	39,702		12,782
Permits and other intangibles, net	37,599		26,768
Total Oil and Gas Field Services	77,301		39,550
Total	$	275,666	$	174,652

Total assets by segment

The following table presents the total assets by reported segment (in thousands):

	September 30, 2011		December 31, 2010
Technical Services	$	588,389	$	525,286
Field Services	44,998		35,253
Industrial Services	322,631		221,472
Oil and Gas Field Services	463,863		272,479
Corporate Items	590,504		547,985
Total	$	2,010,385	$	1,602,475

Total assets by geographical area

The following table presents the total assets by geographical area (in thousands):

	September 30, 2011		December 31, 2010
United States	$	1,109,827	$	933,550
Canada	894,850		664,534
Other foreign	5,708		4,391
Total	$	2,010,385	$	1,602,475

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CLOSURE AND POST-CLOSURE LIABILITIES

9 Months Ended

Sep. 30, 2011

Asset Retirement Obligation Disclosure [Abstract]

CLOSURE AND POST-CLOSURE LIABILITIES

CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the nine months ended September 30, 2011 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2011	$	29,756		$	8,923		$	38,679
Liabilities assumed in acquisitions	—			196			196
New asset retirement obligations	1,749			—			1,749
Accretion	1,654			842			2,496
Changes in estimates recorded to statement of income	(936		)	(15		)	(951		)
Other changes in estimates recorded to balance sheet	(6,150		)	121			(6,029		)
Settlement of obligations	(3,011		)	(441		)	(3,452		)
Currency translation and other	(141		)	(41		)	(182		)
Balance at September 30, 2011	$	22,921		$	9,585		$	32,506

All of the landfill facilities included in the above were active as of September 30, 2011.

New asset retirement obligations incurred in 2011 are being discounted at the credit-adjusted risk-free rate of 8.79% and inflated at a rate of 1.01%.

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STOCK-BASED COMPENSATION

9 Months Ended

Sep. 30, 2011

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

The following table summarizes the total number and type of awards granted during the three- and nine-month periods ended September 30, 2011, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2011			September 30, 2011
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	26,091	$	54.13	180,305	$	48.45
Performance stock awards	3,551	$	50.87	73,499	$	50.87
Total awards	29,642			253,804

All shares and weighted average grant date fair values included in the above table have been adjusted for the two-for-one stock split discussed in Note 1, “Basis of Presentation.” Certain performance stock awards granted in June 2011 are subject to both achieving predetermined revenue and EBITDA targets for a specified period of time and service conditions.  As of September 30, 2011, based on year-to-date results of operations, management determined that it was probable that the performance targets for the 2011 performance awards will be achieved by December 31, 2011. As a result, the Company recognized cumulative expense through sales, general and administration expenses during the three and nine months ended September 30, 2011 related to the 2011 performance stock awards.

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REMEDIAL LIABILITIES

9 Months Ended

Sep. 30, 2011

Environmental Remediation Obligations [Abstract]

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES

The changes to remedial liabilities for the nine months ended September 30, 2011 were as follows (in thousands):

	Remedial Liabilities for Landfill Sites			Remedial Liabilities for Inactive Sites			Remedial Liabilities (Including Superfund) for Non-Landfill Operations			Total
Balance at January 1, 2011	$	5,511		$	82,354		$	49,748		$	137,613
Liabilities assumed in acquisitions	—			—			100			100
Accretion	203			2,849			1,683			4,735
Changes in estimates recorded to statement of income	(8		)	(933		)	(575		)	(1,516		)
Settlement of obligations	(49		)	(2,741		)	(2,309		)	(5,099		)
Currency translation and other	(134		)	(7		)	(696		)	(837		)
Balance at September 30, 2011	$	5,523		$	81,522		$	47,951		$	134,996

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FINANCING ARRANGEMENTS (Tables)

9 Months Ended

Sep. 30, 2011

Debt Disclosure [Abstract]

Summary of the entity's financial arrangements

The following table is a summary of the Company’s financing arrangements (in thousands):

	September 30, 2011		December 31, 2010
Senior secured notes, at 7.625%, due August 15, 2016	$	520,000	$	270,000
Revolving credit facility, due May 31, 2016	—		—
Unamortized notes premium and discount, net	4,590		(5,993		)
Long-term obligations	$	524,590	$	264,007

Schedule of redemption prices expressed as percentages of the principal amount

The Company may redeem some or all of the notes at any time on or after August 15, 2012 at the following redemption prices (expressed as percentages of the principal amount) if redeemed during the twelve-month period commencing on August 15 of the year set forth below, plus, in each case, accrued and unpaid interest, if any, to the date of redemption:

Year	Percentage
2012	103.813	%
2013	101.906	%
2014 and thereafter	100.000	%

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ACCRUED EXPENSES

9 Months Ended

Sep. 30, 2011

Accrued Expenses [ABSTRACT]

ACCRUED EXPENSES

ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	September 30, 2011		December 31, 2010
Insurance	$	21,886	$	19,736
Interest	5,222		7,826
Accrued disposal costs	2,238		2,173
Accrued compensation and benefits	47,277		44,545
Income, real estate, sales and other taxes	24,637		19,529
Other	37,651		22,280
	$	138,911	$	116,089

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Details) (Senior secured notes, USD $)	1 Months Ended
	Mar. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Financing arrangements
Senior secured notes, at 7.625%, due on August 15, 2016		$ 520,000,000	$ 270,000,000
Senior secured notes, interest rate (as a percent)			7.625%
Senior secured notes issued, aggregate principal amount	250,000,000
Clean Harbors, Inc.
Financing arrangements
Senior secured notes issued, aggregate principal amount	$ 250,000,000

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 89,019	$ 107,186
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	87,000	67,671
Allowance for doubtful accounts	623	163
Amortization of deferred financing costs and debt discount	1,230	2,221
Accretion of environmental liabilities	7,231	7,799
Changes in environmental liability estimates	(2,467)	(5,391)
Deferred income taxes	(197)	540
Stock-based compensation	5,329	5,220
Excess tax benefit of stock-based compensation	(1,949)	(1,221)
Income tax benefit related to stock option exercises	1,949	1,215
Gains on sales of businesses	0	(2,678)
Other income	(2,577)	(2,485)
Write-off deferred financing costs and debt discount	0	1,394
Environmental expenditures	(8,551)	(8,704)
Changes in assets and liabilities, net of acquisitions
Accounts receivable	(32,670)	(63,714)
Other current assets	(14,113)	(18,456)
Accounts payable	30,241	47,828
Other current liabilities	(8,762)	15,342
Net cash from operating activities	151,336	153,930
Cash flows from investing activities:
Additions to property, plant and equipment	(113,644)	(74,741)
Acquisitions, net of cash acquired	(336,960)	(13,846)
Additions to intangible assets, including costs to obtain or renew permits	(2,356)	(3,262)
Purchase of available for sale securities	0	(1,486)
Proceeds from sales of marketable securities	425	2,627
Proceeds from sales of fixed assets and assets held for sale	5,925	15,963
Proceeds from insurance settlement	0	1,336
Proceeds from sale of long-term investments	1,000	1,300
Net cash used in investing activities	(445,610)	(72,109)
Cash flows from financing activities:
Change in uncashed checks	(2,580)	(4,682)
Proceeds from exercise of stock options	1,089	550
Remittance of shares, net	(1,897)	(198)
Proceeds from employee stock purchase plan	2,451	1,769
Deferred financing costs paid	(8,442)	(53)
Payments on capital leases	(5,775)	(3,361)
Distribution of cash earned on employee participation plan	(189)	(148)
Excess tax benefit of stock-based compensation	1,949	1,221
Principal payment on debt	0	(30,000)
Issuance of senior secured notes, including premium	261,250	0
Net cash from financing activities	247,856	(34,902)
Effect of exchange rate change on cash	1,367	451
(Decrease) increase in cash and cash equivalents	(45,051)	47,370
Cash and cash equivalents, beginning of period	302,210	233,546
Cash and cash equivalents, end of period	257,159	280,916
Cash payments for interest and income taxes:
Interest paid	30,169	26,230
Income taxes paid	35,085	39,813
Non-cash investing and financing activities:
Property, plant and equipment accrued	20,288	4,775
Assets acquired through capital lease	1,471	10,130
Issuance of acquisition-related common stock, net	$ 0	$ 1,015

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SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2011

Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES

The accompanying unaudited consolidated financial statements of the Company reflect the application of certain new or updated significant accounting policies as described below:

Property, Plant and Equipment (excluding landfill assets)

Property, plant and equipment are stated at cost and include amounts capitalized under capital lease obligations. Expenditures for major renewals and improvements which extend the life of the asset are capitalized. Items of an ordinary repair or maintenance nature are charged directly to operating expense as incurred. During the construction and development period of an asset, the costs incurred, including applicable interest costs, are classified as construction-in-progress. Interest in the amount of $0.4 million and $0.3 million was capitalized to fixed assets during the nine months ended September 30, 2011, and 2010, respectively. Depreciation expense was $70.4 million and $53.9 million for the nine months ended September 30, 2011, and 2010, respectively.

The Company depreciates the cost of these assets, using the straight-line method as follows:

Asset Classification	Estimated Useful Life
Buildings and building improvements
Buildings	30—40 years
Land, leasehold and building improvements	5—40 years
Camp equipment	12—15 years
Vehicles	3—12 years
Equipment
Capitalized software and computer equipment	3 years
Solar equipment	20 years
Containers and railcars	15—20 years
All other equipment	3—10 years
Furniture and fixtures	5—8 years

Land, leasehold and building improvements have a weighted average life of 8.3 years.

Camp equipment consists of industrial lodging facilities that are utilized in the Company’s Industrial Services segment to provide lodging services to companies in the refinery and petrochemical industries.

Solar equipment consists of a solar array that is used to provide electric power for a continuously operating groundwater decontamination pump and treatment system at a closed and capped landfill located in New Jersey. The solar array was installed and became operable during the second quarter of 2011.

The Company recognizes an impairment in the carrying value of long-lived assets when the expected future undiscounted cash flows derived from the assets are less than their carrying value. For the three and nine months ended September 30, 2011, and 2010, the Company has not recorded impairment charges related to long-lived assets.

Recent Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) and are adopted by the Company as of the specified effective dates. Unless otherwise discussed below, management believes that the impact of recently issued accounting pronouncements will not have a material impact on the Company’s financial position, results of operations and cash flows, or do not apply to the Company’s operations.

In 2009, the FASB issued Accounting Standards Update (ASU) 2009-13, Revenue Recognition (Topic 605)—Multiple-Deliverable Revenue Arrangements, or ASU 2009-13 which provides additional guidance on the recognition of revenue from multiple element arrangements. ASU 2009-13 states that if vendor specific objective evidence or third party evidence for deliverables in an arrangement cannot be determined, companies are required to develop a best estimate of the selling price for separate deliverables and allocate arrangement consideration using the relative selling price method. This guidance is effective for fiscal years beginning after June 15, 2010 and may be applied prospectively to new or materially modified arrangements after the effective date or retrospectively. The Company adopted ASU 2009-13 prospectively as of January 1, 2011 and although the adoption did not materially impact its financial condition, results of operations, or cash flow, this guidance may impact the Company’s determination of the separation of deliverables for future arrangements.

In June 2011, the FASB issued ASU 2011-5 Comprehensive Income (Topic 220) — Presentation of Comprehensive Income. The new guidance revises the manner in which entities present comprehensive income in their financial statements. ASU 2011-5 requires entities to report components of comprehensive income in either (1) a continuous statement of comprehensive income or (2) two separate but consecutive statements. The ASU does not change the items that must be reported in other comprehensive income. This guidance will require a change in the presentation of the financial statements and will require retrospective application. The Company will adopt this guidance as of January 2012 and has not determined which approach it will adopt.

In September 2011, the FASB issued ASU 2011-08 which amends the guidance on testing goodwill for impairment. Under the revised guidance, entities testing goodwill for impairment have the option of performing a qualitative assessment before calculating the fair value of the reporting unit (i.e., step 1 of the goodwill impairment test). If entities determine, on the basis of qualitative factors, that the fair value of the reporting unit is more likely than not less than the carrying amount, the two-step impairment test would be required. The ASU does not change how goodwill is calculated or assigned to reporting units, nor does it revise the requirement to test goodwill annually for impairment. In addition, the ASU does not amend the requirement to test goodwill for impairment between annual tests if events or circumstances warrant; however, it does revise the examples of events and circumstances that an entity should consider. The amendments are effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. Early adoption is permitted. The Company will adopt this standard on January 1, 2012 and management does not expect this pronouncement will have a material impact on its financial statements.

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FAIR VALUE MEASUREMENTS (Details) (USD $)	9 Months Ended								3 Months Ended		9 Months Ended
	Sep. 30, 2011 Days Years	Sep. 30, 2010	Dec. 31, 2010	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak')	Sep. 30, 2011 Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Measurements, Recurring [Member]	Sep. 30, 2011 Significant Other Observable Inputs (Level 2) Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Significant Other Observable Inputs (Level 2) Fair Value, Measurements, Recurring [Member]	Sep. 30, 2011 Significant Unobservable Inputs (Level 3) Fair Value, Measurements, Recurring [Member]	Sep. 30, 2010 Significant Unobservable Inputs (Level 3) Fair Value, Measurements, Recurring [Member]	Sep. 30, 2011 Significant Unobservable Inputs (Level 3) Fair Value, Measurements, Recurring [Member]	Sep. 30, 2010 Significant Unobservable Inputs (Level 3) Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Significant Unobservable Inputs (Level 3) Fair Value, Measurements, Recurring [Member]	Sep. 30, 2011 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2010 Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Auction rate securities	$ 4,239,000		$ 5,437,000						$ 4,239,000		$ 4,239,000		$ 5,437,000	$ 4,239,000	$ 5,437,000
Marketable securities	93,000		3,174,000		93,000	3,174,000								93,000	3,174,000
Percentage of outstanding common shares of acquiree already owned by company (as a percent)				3.15%
Interest rate, resetting days (in days)	28
Temporary decline in fair value of securities	(500,000)
Unrealized pre-tax gain (loss) on auction rate securities	(200,000)	200,000
Changes in the entity's auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period									5,311,000	5,315,000	5,437,000	6,503,000
Sale of auction rate securities									(1,000,000)		(1,000,000)	(1,300,000)
Unrealized (losses) gains included in other comprehensive income									(72,000)	115,000	(198,000)	227,000
Balance at the end of the period									$ 4,239,000	$ 5,430,000	$ 4,239,000	$ 5,430,000

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REMEDIAL LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2011

Environmental Remediation Obligations [Abstract]

Changes to remedial liabilities

The changes to remedial liabilities for the nine months ended September 30, 2011 were as follows (in thousands):

	Remedial Liabilities for Landfill Sites			Remedial Liabilities for Inactive Sites			Remedial Liabilities (Including Superfund) for Non-Landfill Operations			Total
Balance at January 1, 2011	$	5,511		$	82,354		$	49,748		$	137,613
Liabilities assumed in acquisitions	—			—			100			100
Accretion	203			2,849			1,683			4,735
Changes in estimates recorded to statement of income	(8		)	(933		)	(575		)	(1,516		)
Settlement of obligations	(49		)	(2,741		)	(2,309		)	(5,099		)
Currency translation and other	(134		)	(7		)	(696		)	(837		)
Balance at September 30, 2011	$	5,523		$	81,522		$	47,951		$	134,996

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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010		Dec. 31, 2010
Segment reporting information
Third party revenues	$ 556,053		$ 487,651		$ 1,438,250		$ 1,314,186
Intersegment revenues, net
Direct revenues	556,053		487,651		1,438,250		1,314,186
Property, plant and equipment, net	880,719				880,719				655,394
Goodwill	134,696				134,696				60,252
Permits and other intangibles, net	140,970				140,970				114,400
Total assets	2,010,385				2,010,385				1,602,475
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	2,435		2,495		7,231		7,799
Depreciation and amortization	34,604		22,892		87,000		67,671
Income from operations	66,792		73,372		158,418		168,914
Other income	(164)		669		(5,931)		(2,485)
Loss on early extinguishment of debt	0		2,294		0		2,294
Interest expense, net of interest income	10,927		7,198		28,047		21,772
Income from continuing operations, before provision for income taxes	56,029		63,211		136,302		147,333
Reporting segments number					4
Number of operations for which the revenues are insignificant					2
Reportable segments
Segment reporting information
Adjusted EBITDA, Total	103,831		98,759		252,649		244,384
Property, plant and equipment, net	880,719				880,719				655,394
Total Intangible assets	275,666				275,666				174,652
Total assets	2,010,385				2,010,385				1,602,475
Technical Services
Segment reporting information
Third party revenues	209,245		177,266		597,022		498,202
Intersegment revenues, net	4,612		5,577		13,963		17,653
Direct revenues	213,857		182,843		610,985		515,855
Adjusted EBITDA, Total	59,005		46,195		163,956		123,760
Property, plant and equipment, net	292,652				292,652				259,582
Goodwill	45,965				45,965				33,448
Permits and other intangibles, net	79,509				79,509				66,075
Total Intangible assets	125,474				125,474				99,523
Total assets	588,389				588,389				525,286
Field Services
Segment reporting information
Third party revenues	117,448	[1]	183,120	[2]	252,322	[1]	396,496	[2]
Intersegment revenues, net	(6,274)	[1]	(8,814)	[2]	(15,848)	[1]	(22,077)	[2]
Direct revenues	111,174	[1]	174,306	[2]	236,474	[1]	374,419	[2]
Adjusted EBITDA, Total	22,746		48,430		41,592		95,064
Property, plant and equipment, net	36,130				36,130				32,311
Goodwill	3,088				3,088				3,088
Permits and other intangibles, net	3,331				3,331				3,651
Total Intangible assets	6,419				6,419				6,739
Total assets	44,998				44,998				35,253
Field Services | Yellowstone River [Member]
Segment reporting information
Third party revenues	41,500				41,500
Field Services | Gulf of Mexico
Segment reporting information
Third party revenues			123,800				232,400
Industrial Services
Segment reporting information
Third party revenues	113,543		79,723		333,502		270,847
Intersegment revenues, net	4,323		2,239		363		608
Direct revenues	117,866		81,962		333,865		271,455
Adjusted EBITDA, Total	22,677		18,947		71,882		62,929
Property, plant and equipment, net	231,979				231,979				180,781
Goodwill	45,941				45,941				10,934
Permits and other intangibles, net	20,531				20,531				17,906
Total Intangible assets	66,472				66,472				28,840
Total assets	322,631				322,631				221,472
Oil and Gas Field Services
Segment reporting information
Third party revenues	115,554		47,503		254,805		148,666
Intersegment revenues, net	(2,091)		1,529		3,066		5,151
Direct revenues	113,463		49,032		257,871		153,817
Adjusted EBITDA, Total	28,416		10,473		51,508		27,935
Property, plant and equipment, net	278,546				278,546				151,244
Goodwill	39,702				39,702				12,782
Permits and other intangibles, net	37,599				37,599				26,768
Total Intangible assets	77,301				77,301				39,550
Total assets	463,863				463,863				272,479
Corporate Items
Segment reporting information
Third party revenues	263		39		599		(25)
Intersegment revenues, net	(570)		(531)		(1,544)		(1,335)
Direct revenues	(307)		(492)		(945)		(1,360)
Adjusted EBITDA, Total	(29,013)		(25,286)		(76,289)		(65,304)
Property, plant and equipment, net	41,412				41,412				31,476
Total assets	590,504				590,504				547,985
United States
Segment reporting information
Total assets	1,109,827				1,109,827				933,550
Canada
Segment reporting information
Total assets	894,850				894,850				664,534
Other foreign
Segment reporting information
Total assets	$ 5,708				$ 5,708				$ 4,391

[1] During the three and nine months ended September 30, 2011, third party revenues for the Field Services segment included revenues associated with the Yellowstone River oil spill response efforts of $41.5 million.

[2] During the three and nine months ended September 30, 2010, third party revenues for the Field Services segment included revenues associated with the oil spill response efforts in the Gulf of Mexico and Michigan of $123.8 million and $232.4 million, respectively.

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BUSINESS COMBINATIONS

9 Months Ended

Sep. 30, 2011

Business Combinations [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

Acquisitions during the third quarter

During the quarter ended September 30, 2011, the Company acquired (i) certain assets of a Canadian public company which is engaged in the business of providing geospatial, line clearing and drilling services in Canada and the United States; (ii) all of the outstanding stock of a privately owned U.S. company which specializes in treating refinery waste streams primarily in the United States; and (iii) all of the outstanding stock of a privately owned Canadian company which manufactures modular buildings. The combined purchase price for the three acquisitions was approximately $144.2 million, including the assumption and payment of debt of $25.2 million, and preliminary post-closing adjustments of $6.5 million based upon the assumed target amounts of working capital.

The Company's current period acquisitions discussed above will (i) enhance the Company's service offerings to its customers and its reputation as a leading provider of comprehensive field services for the oil and gas sectors; (ii) provide a complement to Clean Harbors' catalyst handling, industrial and specialty industrial services for the refinery and petrochemical industry; and (iii) help expand its growing lodging business, respectively. These current period acquisitions have been integrated with the Oil and Gas Field Services, Technical Services and Industrial Services segments of the Company's operations and reporting structure.

The following table summarizes the preliminary aggregate purchase price for the current period acquisitions at their acquisition dates (in thousands of U.S. dollars).

Cash consideration	$	112,450
Debt assumed and paid-off on acquisition date	25,183
Estimated net amount due to the sellers for working capital adjustments	6,524
Total estimated purchase price	$	144,157

The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands). The fair value of all the acquired identifiable assets and liabilities summarized below is provisional pending finalization of the Company's acquisition accounting.

	At the Acquisition Dates (As reported at September 30, 2011)
Current assets (i)	$	40,028
Property, plant and equipment	60,109
Customer relationships and other intangibles	23,371
Other assets	196
Current liabilities	(19,522		)
Asset retirement obligations and remedial liabilities	(193		)
Other liabilities	(4,469		)
Total identifiable net assets	99,520
Goodwill (ii)	44,637
Total	$	144,157

(i) The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million.

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $16.3 million, $12.8 million and $15.5 million has been assigned to the Oil and Gas Field Services segment, the Technical Services segment, and the Industrial Services segment, respectively. Certain amounts will not be deductible for tax purposes.

Management has determined the preliminary purchase price allocations based on estimates of the fair values of all tangible and intangible assets acquired and liabilities assumed. Such amounts are subject to adjustment based on the additional information necessary to determine fair values.

Acquisition related costs of $0.5 million and $0.7 million were included in selling, general and administrative expenses in the Company's consolidated statements of income for the three and nine months ended September 30, 2011, respectively.

The results of operations of the acquired businesses have been included in the Company's consolidated financial statements since the respective acquisition dates. Revenues attributable to the current period acquisitions included in the Company's consolidated statements of income for each of the three and nine months ended September 30, 2011 were approximately $13.1 million. The Company has determined that the separate disclosure of earnings for those current period acquisitions is impracticable for the three and nine months ended September 30, 2011 due to the integration of those businesses' operations into the Company upon acquisition.

The following unaudited pro forma combined summary data presents information as if the current period acquisitions had been acquired at the beginning of 2010 and 2011 and assumes that there were no material, non-recurring pro forma adjustment directly attributable to the acquisitions. The pro forma information does not necessarily reflect the actual results that would have occurred had the Company and those three acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Pro forma combined revenues	$	575,010	$	513,253	$	1,545,216	$	1,392,234
Pro forma combined net income	$	35,822	$	36,496	$	93,372	$	102,460

Peak

On June 10, 2011, the Company acquired 100% of the outstanding common shares of Peak Energy Services Ltd. (“Peak”) (other than the 3.15% of Peak’s outstanding common shares which the Company already owned) in exchange for approximately CDN $158.7 million in cash (CDN $0.95 for each Peak share) and the assumption and payment of Peak net debt of approximately CDN $37.5 million. The total acquisition price, which includes the previous investment in Peak shares referred to above, was approximately CDN $200.2 million, or U.S. $205.1 million based on an exchange rate of 0.976057 CDN $ to one U.S. $ on June 10, 2011.

Peak is a diversified energy services corporation headquartered in Calgary, Alberta, operating in western Canada and the U.S. Through its various operating divisions, Peak provides drilling and production equipment and services to its customers in the conventional and unconventional oil and natural gas industries as well as the oil sands region of western Canada. Peak also provides water technology solutions to a variety of customers throughout North America. Peak employs approximately 900 people. Peak shares previously traded on the Toronto Stock Exchange under the symbol “PES.” The Company anticipates that this acquisition will expand its presence in the energy services marketplace, particularly in the area of oil and natural gas drilling and production support. The Peak business has been integrated within the Oil and Gas Field Services and Industrial Services segments of the Company’s operations and reporting structure.

The following table summarizes the preliminary purchase price for Peak at the acquisition date (in thousands of U.S. dollars).

Cash paid for Peak common shares	$	162,585
Fair value of previously owned common shares (1)	4,117
Peak net debt assumed (2)	38,431
Total estimated purchase price	$	205,133

_______________________

(1) The Company previously owned a 3.15% interest in Peak which was recorded in marketable securities. On June 10, 2011, the Company acquired the remaining outstanding shares of Peak and as a result, the Company remeasured the fair value of its previously held common shares and recognized the resulting gain of $1.9 million in other income. The unrealized gain on the Peak investment was previously recorded in accumulated other comprehensive income. For this purpose, the fair value of the Company’s previous investment in Peak was deemed to be $4.1 million, calculated based on the closing price of Peak’s shares on the Toronto Stock Exchange on the date before the acquisition was publicly announced.

(2) The outstanding Peak debt, net of $15.7 million of cash assumed, which consisted of three term loan facilities, was paid off on June 10, 2011.

Acquisition related costs of $0.1 million and $0.7 million were included in selling, general and administrative expenses in the Company’s consolidated statements of income for the three and nine months ended September 30, 2011, respectively.

The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands). The fair value of all the acquired identifiable assets and liabilities summarized below is provisional pending finalization of the Company's acquisition accounting. Measurement period adjustments reflect new information obtained about facts and circumstances that existed as of the acquisition date. The Company believes that such information provides a reasonable basis for estimating the fair values of assets acquired and liabilities assumed but the Company is waiting for additional information necessary to finalize fair value. The Company expects to finalize the valuation and complete the purchase price allocation as soon as practicable but no later than one year from the acquisition date. Final determination of the fair value may result in further adjustments to the values presented below.

	June 10, 2011 (As reported at June 30, 2011)			Measurement Period Adjustments			June 10, 2011 (As adjusted)
Current assets (i)	$	45,797		$	(811	)	$	44,986
Property, plant and equipment	149,344			921			150,265
Identifiable intangible assets	14,107			(921		)	13,186
Other assets	8,800			(7,691		)	1,109
Current liabilities	(27,717		)	(643		)	(28,360		)
Asset retirement obligations	—			(103		)	(103		)
Other liabilities	(8,344		)	218			(8,126		)
Total identifiable net assets	$	181,987		$	(9,030	)	$	172,957
Goodwill (ii)	23,146			9,030			32,176
Total	$	205,133		$	—		$	205,133

_______________________

(i) The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary fair value of $33.3 million. The gross amount due was $34.7 million.

(ii) Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $13.0 million and $19.2 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectively; however, the amount and the allocation are subject to change pending the finalization of the Company’s valuation.

The Company has determined that the separate disclosure of Peak’s earnings is impracticable for the three and nine months ended September 30, 2011 due to the integration of Peak operations into the Company upon acquisition. Revenues attributable to Peak included in the Company’s consolidated statements of income for the three and nine months ended September 30, 2011 were $58.2 million and $67.8 million, respectively.

The following unaudited pro forma combined summary data presents information as if Peak had been acquired at the beginning of 2010 and 2011 and assumes that there was no material, non-recurring pro forma adjustment directly attributable to the acquisition. The pro forma information does not necessarily reflect the actual results that would have occurred had the Company and Peak been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Pro forma combined revenues	$	560,130	$	527,425	$	1,537,520	$	1,422,979
Pro forma combined net income	$	37,558	$	41,378	$	91,295	$	103,795

Status of Proposed Acquisition of Badger

The Company entered on January 25, 2011 into a definitive agreement to acquire Badger Daylighting Ltd. (“Badger”), an Alberta corporation headquartered in Calgary, Alberta. Under the terms of the acquisition agreement, a condition to the respective obligations of each of the Company and Badger to complete the transaction was approval of the transaction by a required affirmative vote of at least 66 2/3 % of Badger’s shareholders and option holders voting on the matter. At a meeting held on April 26, 2011, the Badger shareholders and option holders failed to approve the transaction by the required vote. In accordance with the terms of the acquisition agreement, the Company terminated the agreement on April 26, 2011. The acquisition agreement provided that if the Company terminated the agreement because of a failure by the Badger shareholders and option holders to approve the transaction by the required vote, Badger was obligated to reimburse the Company’s out of pocket expenses incurred in connection with the proposed transaction including the financing thereof, up to a maximum of CDN $1.5 million. Based on a demand letter sent to Badger in May 2011, the Company received U.S. $1.1 million from Badger in June for reimbursement in accordance with this provision of the agreement.

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GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Expected amortization
2011 (three months)	$ 4,028
2012	13,466
2013	12,927
2014	12,302
2015	11,678
Thereafter	86,569
Total	140,970
Other Acquisitions | Customer relationships
Acquired finite-lived intangible assets
Total Amount Assigned	16,556
Weighted Average Amortization Period (in years)	15.0
Peak | Customer relationships
Acquired finite-lived intangible assets
Total Amount Assigned	9,246
Weighted Average Amortization Period (in years)	6.7
Other Acquisitions | Other intangible assets
Acquired finite-lived intangible assets
Total Amount Assigned	2,953
Weighted Average Amortization Period (in years)	14.1
Peak | Other intangible assets
Acquired finite-lived intangible assets
Total Amount Assigned	3,069
Weighted Average Amortization Period (in years)	5.9
Peak
Acquired finite-lived intangible assets
Total Amount Assigned	12,315
Weighted Average Amortization Period (in years)	6.5
Other Acquisitions
Acquired finite-lived intangible assets
Total Amount Assigned	$ 19,509
Weighted Average Amortization Period (in years)	14.9

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2011

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes to goodwill for the nine months ended September 30, 2011 were as follows (in thousands):

	2011
Balance at January 1, 2011	$	60,252
Acquired from acquisitions	80,394
Foreign currency translation	(5,950		)
Balance at September 30, 2011	$	134,696

Summary of amortizable other intangible assets

Below is a summary of amortizable other intangible assets (in thousands):

	September 30, 2011							December 31, 2010
	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)
Permits	$	106,504	$	44,569	$	61,935	18.0	$	103,493	$	42,430	$	61,063	15.9
Customer relationships	82,206		15,234		66,972		8.2	58,322		10,418		47,904		8.0
Other intangible assets	20,791		8,728		12,063		4.7	13,218		7,785		5,433		3.5
	$	209,501	$	68,531	$	140,970	14.1	$	175,033	$	60,633	$	114,400	9.4

Total amounts assigned and the weighted average amortization period, by major intangible asset classes, related to the Peak acquisition

The total amounts assigned and the weighted average amortization period by major intangible asset classes as it relates to these acquisitions as of September 30, 2011, are as follows:

	Peak Total Amount Assigned		Peak Weighted Average Amortization Period (in years)	Other Acquisitions Total Amount Assigned		Other Acquisitions Weighted Average Amortization Period (in years)
Customer relationships	$	9,246	6.7	$	16,556	15.0
Other intangibles	3,069		5.9	2,953		14.1
	$	12,315	6.5	$	19,509	14.9

Schedule of expected amortization for the net carrying amount of finite lived intangible assets

Below is the expected future amortization for the net carrying amount of finite lived intangible assets at September 30, 2011 (in thousands):

Years Ending December 31,	Expected Amortization
2011 (three months)	$	4,028
2012	13,466
2013	12,927
2014	12,302
2015	11,678
Thereafter	86,569
	$	140,970

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EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share computations

The following is a reconciliation of basic and diluted earnings per share computations (in thousands except for per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Numerator for basic and diluted earnings per share:
Income from continuing operations	$	37,133	$	38,827	$	89,019	$	104,392
Income from discontinued operations	—		—		—		2,794
Net income	$	37,133	$	38,827	$	89,019	$	107,186
Denominator:
Basic shares outstanding	53,023		52,658		52,921		52,581
Dilutive effect of equity-based compensation awards	347		305		377		271
Dilutive shares outstanding	53,370		52,963		53,298		52,852
Basic earnings per share:
Income from continuing operations	$	0.70	$	0.74	$	1.68	$	1.99
Income from discontinued operations, net of tax	—		—		—		0.05
Net income	$	0.70	$	0.74	$	1.68	$	2.04
Diluted earnings per share:
Income from continuing operations	$	0.70	$	0.73	$	1.67	$	1.98
Income from discontinued operations, net of tax	—		—		—		0.05
Net income	$	0.70	$	0.73	$	1.67	$	2.03

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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Days Years	Sep. 30, 2010	Dec. 31, 2010 Years
Changes to goodwill
Balance at the beginning of the period			$ 60,252,000
Acquired from acquisitions			80,394,000
Foreign currency translation			(5,950,000)
Balance at the end of the period	134,696,000		134,696,000		60,252,000
Finite-lived intangible assets
Cost	209,501,000		209,501,000		175,033,000
Accumulated Amortization	68,531,000		68,531,000		60,633,000
Net	140,970,000		140,970,000		114,400,000
Weighted Average Amortization Period (in years)			14.1		9.4
Aggregate amortization expense	3,200,000	2,800,000	8,700,000	8,000,000
Permits
Finite-lived intangible assets
Cost	106,504,000		106,504,000		103,493,000
Accumulated Amortization	44,569,000		44,569,000		42,430,000
Net	61,935,000		61,935,000		61,063,000
Weighted Average Amortization Period (in years)			18.0		15.9
Customer relationships
Finite-lived intangible assets
Cost	82,206,000		82,206,000		58,322,000
Accumulated Amortization	15,234,000		15,234,000		10,418,000
Net	66,972,000		66,972,000		47,904,000
Weighted Average Amortization Period (in years)			8.2		8.0
Other intangible assets
Finite-lived intangible assets
Cost	20,791,000		20,791,000		13,218,000
Accumulated Amortization	8,728,000		8,728,000		7,785,000
Net	$ 12,063,000		$ 12,063,000		$ 5,433,000
Weighted Average Amortization Period (in years)			4.7		3.5

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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2011

Asset Retirement Obligation Disclosure [Abstract]

Schedule of closure and post-closure liabilities

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) for the nine months ended September 30, 2011 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2011	$	29,756		$	8,923		$	38,679
Liabilities assumed in acquisitions	—			196			196
New asset retirement obligations	1,749			—			1,749
Accretion	1,654			842			2,496
Changes in estimates recorded to statement of income	(936		)	(15		)	(951		)
Other changes in estimates recorded to balance sheet	(6,150		)	121			(6,029		)
Settlement of obligations	(3,011		)	(441		)	(3,452		)
Currency translation and other	(141		)	(41		)	(182		)
Balance at September 30, 2011	$	22,921		$	9,585		$	32,506

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EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2011

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

The following is a reconciliation of basic and diluted earnings per share computations (in thousands except for per share amounts):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Numerator for basic and diluted earnings per share:
Income from continuing operations	$	37,133	$	38,827	$	89,019	$	104,392
Income from discontinued operations	—		—		—		2,794
Net income	$	37,133	$	38,827	$	89,019	$	107,186
Denominator:
Basic shares outstanding	53,023		52,658		52,921		52,581
Dilutive effect of equity-based compensation awards	347		305		377		271
Dilutive shares outstanding	53,370		52,963		53,298		52,852
Basic earnings per share:
Income from continuing operations	$	0.70	$	0.74	$	1.68	$	1.99
Income from discontinued operations, net of tax	—		—		—		0.05
Net income	$	0.70	$	0.74	$	1.68	$	2.04
Diluted earnings per share:
Income from continuing operations	$	0.70	$	0.73	$	1.67	$	1.98
Income from discontinued operations, net of tax	—		—		—		0.05
Net income	$	0.70	$	0.73	$	1.67	$	2.03

All shares and per share amounts included in the above table have been adjusted for the two-for-one stock split discussed in Note 1, “Basis of Presentation.” For the three- and nine-month periods ended September 30, 2011, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the above calculations except as follows. For the three- and nine-month periods ended September 30, 2011, the above calculation excluded the dilutive effects of 73 thousand outstanding performance stock awards for which the performance criteria were not attained at that time.  For the three- and nine-month periods ended September 30, 2010, the above calculation excluded the dilutive effects of 170 thousand outstanding performance stock awards for which the performance criteria were not attained at that time and 36 thousand options that were not then in-the-money.

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SUBSEQUENT EVENT SUBSEQUENT EVENT (Details) (Idling of Hazardous Waste Incinerator [Member], USD $)	0 Months Ended
	Nov. 02, 2011
Idling of Hazardous Waste Incinerator [Member]
Subsequent Event [Line Items]
Impairment of Long-Lived Assets Held-for-use	$ 0

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FAIR VALUE MEASUREMENTS

9 Months Ended

Sep. 30, 2011

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS

The Company’s financial instruments consist of cash and cash equivalents, marketable securities, receivables, trade payables, auction rate securities and long-term debt. The estimated fair value of cash equivalents, receivables, and trade payables approximate their carrying value due to the short maturity of these instruments. As of September 30, 2011, the Company held certain marketable securities and auction rate securities that are required to be measured at fair value on a recurring basis. The fair value of marketable securities is recorded based on quoted market prices. The auction rate securities are classified as available for sale and the fair value of these securities as of September 30, 2011 was estimated utilizing a discounted cash flow analysis. The discounted cash flow analysis considered, among other items, the collateralization underlying the security investments, the creditworthiness of the counterparty, the timing of expected future cash flows, and the expectation of the next time these securities are expected to have a successful auction. The auction rate securities were also compared, when possible, to other observable market data with similar characteristics to the securities held by the Company.

As of September 30, 2011, all of the Company’s auction rate securities continue to have AAA underlying ratings. The underlying assets of the Company’s auction rate securities are student loans, which are substantially insured by the Federal Family Education Loan Program. During the three months ended September 30, 2011, the Company liquidated $1.0 million in auction rate securities at par. The Company attributes the $0.5 million decline in the fair value of the securities from the original cost basis to external liquidity issues rather than credit issues. The Company assessed the decline in value to be temporary because it does not intend to sell and it is more likely than not that the Company will not have to sell the securities before their maturity.

During the nine months ended September 30, 2011 and 2010, the Company recorded an unrealized pre-tax loss of $0.2 million and a pre-tax gain of $0.2 million, respectively, on its auction rate securities, which was included in accumulated other comprehensive income. As of September 30, 2011, the Company continued to earn interest on its auction rate securities according to their stated terms with interest rates resetting generally every 28 days.

The Company’s assets measured at fair value on a recurring basis at September 30, 2011 and December 31, 2010 were as follows (in thousands):

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at September 30, 2011
Auction rate securities	$	—	$	—	$	4,239	$	4,239
Marketable securities	$	93	$	—	$	—	$	93

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance at December 31, 2010
Auction rate securities	$	—	$	—	$	5,437	$	5,437
Marketable securities	$	3,174	$	—	$	—	$	3,174

The decrease in marketable securities since December 31, 2010 was primarily due to the Peak acquisition on June 10, 2011. The Company previously owned a 3.15% interest in Peak which was recorded in marketable securities.

The following tables present the changes in the Company’s auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the three and nine months ended September 30, 2011 and 2010 (in thousands):

	Three Months Ended
	September 30,
	2011			2010
Balance at July 1,	$	5,311		$	5,315
Sale of auction rate securities	(1,000		)	—
Unrealized (losses) gains included in other comprehensive income	(72		)	115
Balance at September 30,	$	4,239		$	5,430

	Nine Months Ended
	September 30,
	2011			2010
Balance at January 1,	$	5,437		$	6,503
Sale of auction rate securities	(1,000		)	(1,300		)
Unrealized (losses) gains included in other comprehensive income	(198		)	227
Balance at September 30,	$	4,239		$	5,430

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SEGMENT REPORTING

9 Months Ended

Sep. 30, 2011

Segment Reporting [Abstract]

SEGMENT REPORTING

SEGMENT REPORTING

During the quarter ended March 31, 2011, the Company re-aligned its management reporting structure. Under the new structure, the Company’s operations are managed in four reportable segments: Technical Services, Field Services, Industrial Services and Oil and Gas Field Services. The new segment, Oil and Gas Field Services, consists of the previous Exploration Services segment, as well as certain oil and gas related field services departments that were re-assigned from the Industrial Services segment. In addition, certain departments from the Field Services segment were re-assigned to the Industrial Services segment.  Accordingly, the Company re-aligned and re-allocated departmental costs being allocated among the segments to support these management reporting changes.  The Company has recast the segment information to conform to the current year presentation.

Performance of the segments is evaluated on several factors, of which the primary financial measure is “Adjusted EBITDA,” which consists of net income plus accretion of environmental liabilities, depreciation and amortization, net interest expense, and provision for income taxes. Also excluded are other income and income from discontinued operations, net of tax as these amounts are not considered part of usual business operations. Transactions between the segments are accounted for at the Company’s estimate of fair value based on similar transactions with outside customers.

The operations not managed through the Company’s four operating segments are recorded as “Corporate Items.” Corporate Items revenues consist of two different operations for which the revenues are insignificant. Corporate Items cost of revenues represents certain central services that are not allocated to the four operating segments for internal reporting purposes. Corporate Items selling, general and administrative expenses include typical corporate items such as legal, accounting and other items of a general corporate nature that are not allocated to the Company’s four operating segments.

The following table reconciles third party revenues to direct revenues for the three- and nine-month periods ended September 30, 2011 and 2010 (in thousands). Third party revenue is revenue billed to outside customers by a particular segment. Direct revenue is the revenue allocated to the segment performing the provided service. The Company analyzes results of operations based on direct revenues because the Company believes that these revenues and related expenses best reflect the manner in which operations are managed.

	For the Three Months Ended September 30, 2011
	Technical Services		Field Services (1)			Industrial Services		Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	209,245	$	117,448		$	113,543	$	115,554		$	263		$	556,053
Intersegment revenues, net	4,612		(6,274		)	4,323		(2,091		)	(570		)	—
Direct revenues	$	213,857	$	111,174		$	117,866	$	113,463		$	(307	)	$	556,053

	For the Three Months Ended September 30, 2010
	Technical Services		Field Services (2)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	177,266	$	183,120		$	79,723	$	47,503	$	39		$	487,651
Intersegment revenues, net	5,577		(8,814		)	2,239		1,529		(531		)	—
Direct revenues	$	182,843	$	174,306		$	81,962	$	49,032	$	(492	)	$	487,651

	For the Nine Months Ended September 30, 2011
	Technical Services		Field Services (1)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	597,022	$	252,322		$	333,502	$	254,805	$	599		$	1,438,250
Intersegment revenues, net	13,963		(15,848		)	363		3,066		(1,544		)	—
Direct revenues	$	610,985	$	236,474		$	333,865	$	257,871	$	(945	)	$	1,438,250

	For the Nine Months Ended September 30, 2010
	Technical Services		Field Services (2)			Industrial Services		Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	498,202	$	396,496		$	270,847	$	148,666	$	(25	)	$	1,314,186
Intersegment revenues, net	17,653		(22,077		)	608		5,151		(1,335		)	—
Direct revenues	$	515,855	$	374,419		$	271,455	$	153,817	$	(1,360	)	$	1,314,186

_______________________

(1) During the three and nine months ended September 30, 2011, third party revenues for the Field Services segment included revenues associated with the Yellowstone River oil spill response efforts of $41.5 million.

(2) During the three and nine months ended September 30, 2010, third party revenues for the Field Services segment included revenues associated with the oil spill response efforts in the Gulf of Mexico and Michigan of $123.8 million and $232.4 million, respectively.

The following table presents information used by management by reported segment (in thousands). The Company does not allocate interest expense, income taxes, depreciation, amortization, accretion of environmental liabilities, and other income to segments.

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2011			2010			2011			2010
Adjusted EBITDA:
Technical Services	$	59,005		$	46,195		$	163,956		$	123,760
Field Services	22,746			48,430			41,592			95,064
Industrial Services	22,677			18,947			71,882			62,929
Oil and Gas Field Services	28,416			10,473			51,508			27,935
Corporate Items	(29,013		)	(25,286		)	(76,289		)	(65,304		)
Total	$	103,831		$	98,759		$	252,649		$	244,384
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	$	2,435		$	2,495		$	7,231		$	7,799
Depreciation and amortization	34,604			22,892			87,000			67,671
Income from operations	66,792			73,372			158,418			168,914
Other (income) loss	(164		)	669			(5,931		)	(2,485		)
Loss on early extinguishment of debt	—			2,294			—			2,294
Interest expense, net of interest income	10,927			7,198			28,047			21,772
Income from continuing operations before provision for income taxes	$	56,029		$	63,211		$	136,302		$	147,333

The following table presents assets by reported segment and in the aggregate (in thousands):

	September 30, 2011		December 31, 2010
Property, plant and equipment, net
Technical Services	$	292,652	$	259,582
Field Services	36,130		32,311
Industrial Services	231,979		180,781
Oil and Gas Field Services	278,546		151,244
Corporate Items	41,412		31,476
Total property, plant and equipment, net	$	880,719	$	655,394
Intangible assets:
Technical Services
Goodwill	$	45,965	$	33,448
Permits and other intangibles, net	79,509		66,075
Total Technical Services	125,474		99,523
Field Services
Goodwill	3,088		3,088
Permits and other intangibles, net	3,331		3,651
Total Field Services	6,419		6,739
Industrial Services
Goodwill	45,941		10,934
Permits and other intangibles, net	20,531		17,906
Total Industrial Services	66,472		28,840
Oil and Gas Field Services
Goodwill	39,702		12,782
Permits and other intangibles, net	37,599		26,768
Total Oil and Gas Field Services	77,301		39,550
Total	$	275,666	$	174,652

The following table presents the total assets by reported segment (in thousands):

	September 30, 2011		December 31, 2010
Technical Services	$	588,389	$	525,286
Field Services	44,998		35,253
Industrial Services	322,631		221,472
Oil and Gas Field Services	463,863		272,479
Corporate Items	590,504		547,985
Total	$	2,010,385	$	1,602,475

The following table presents the total assets by geographical area (in thousands):

	September 30, 2011		December 31, 2010
United States	$	1,109,827	$	933,550
Canada	894,850		664,534
Other foreign	5,708		4,391
Total	$	2,010,385	$	1,602,475

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BUSINESS COMBINATIONS (Details)			3 Months Ended			9 Months Ended						1 Months Ended	3 Months Ended			9 Months Ended
	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') Scenario, Previously Reported [Member] USD ($)		Sep. 30, 2011 Other Acquisitions USD ($)		Sep. 30, 2010 Other Acquisitions USD ($)	Sep. 30, 2011 Other Acquisitions USD ($)		Sep. 30, 2010 Other Acquisitions USD ($)	Sep. 30, 2011 Other Acquisitions Oil and Gas Field Services USD ($)	Sep. 30, 2011 Other Acquisitions Technical Services [Member] USD ($)	Sep. 30, 2011 Other Acquisitions Industrial Services USD ($)	Jun. 30, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($) persons	Sep. 30, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)		Sep. 30, 2010 Peak Energy Services Ltd.'s ('Peak') USD ($)	Sep. 30, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)		Sep. 30, 2010 Peak Energy Services Ltd.'s ('Peak') USD ($)	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)		Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') CAD		Sep. 30, 2011 Peak Energy Services Ltd.'s ('Peak') Oil and Gas Field Services USD ($)	Sep. 30, 2011 Peak Energy Services Ltd.'s ('Peak') Industrial Services USD ($)	Sep. 30, 2011 Badger Daylighting Ltd. ("Badger") USD ($)	Jan. 25, 2011 Badger Daylighting Ltd. ("Badger") CAD
Business Combinations
Business Combination, Acquired Receivables, Fair Value			$ 21,400,000			$ 21,400,000							$ 33,300,000			$ 33,300,000
Outstanding common shares acquired (as a percent)																			100.00%		100.00%
Percentage of outstanding common shares of acquiree already owned by company (as a percent)																			3.15%		3.15%
Cash paid in exchange for acquisition																			158,700,000
Cash paid per share in exchange for acquisition (in dollars per share)																			$ 0.95
Fair value of consideration transferred	205,133,000		144,157,000			144,157,000							205,133,000			205,133,000			205,133,000		200,200,000
Debt assumed in exchange of acquisition			25,183,000			25,183,000													38,431,000	[1]	37,500,000	[1]
Estimated net amount due to the sellers for working capital adjustments			6,524,000			6,524,000
Exchange rate translation																			0.976057		0.976057
Number of employees												900
Summary of consideration paid at the acquisition date
Cash Consideration			112,450,000			112,450,000													162,585,000
Fair value of previously owned common shares																			4,117,000	[2]
Net debt assumed			(25,183,000)			(25,183,000)													(38,431,000)	[1]	(37,500,000)	[1]
Total consideration for acquisition	205,133,000		144,157,000			144,157,000							205,133,000			205,133,000			205,133,000		200,200,000
Gain loss recognized in other income previously held as common shares												1,900,000
Fair value of common shares in acquiree																			4,100,000
Cash assumed for repayment of outstanding debt																			15,700,000
Number of term loan facilities																			3		3
Acquisition related costs			500,000			700,000							100,000			700,000
Summary of Recognised Amounts of Identifiable Assets and Liabilities Assumed [Roll Forward]
Current assets	45,797,000	[3]
Property, plant and equipment	149,344,000
Identifiable intangible assets	14,107,000
Other assets	8,800,000
Current liabilities	(27,717,000)
Other liabilities	(8,344,000)
Total identifiable net assets	181,987,000		99,520,000			99,520,000							172,957,000			172,957,000
Goodwill	23,146,000	[4]							16,300,000	12,800,000	15,500,000												13,000,000	19,200,000
Total	205,133,000																		205,133,000		200,200,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets													(811,000)	[3]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment													921,000
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Identifiable Intangibles													(921,000)
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Assets													(7,691,000)
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Current Liabilities													(643,000)
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Asset Retirement Obligations													(103,000)
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Liabilities													218,000
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Identifiable Net Assets													(9,030,000)
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles													9,030,000	[4]
Current assets, (As adjusted)	45,797,000	[3]	40,028,000	[5]		40,028,000	[5]						44,986,000	[3]		44,986,000	[3]
Property, plant and equipment, (As adjusted)	149,344,000		60,109,000			60,109,000							150,265,000			150,265,000
Identifiable intangible assets ( As adjusted)	14,107,000		23,371,000			23,371,000							13,186,000			13,186,000
Other assets (As adjusted)	8,800,000		196,000			196,000							1,109,000			1,109,000
Current liabilities (As adjusted)	(27,717,000)		(19,522,000)			(19,522,000)							(28,360,000)			(28,360,000)
Other liabilities (As adjusted)	(8,344,000)		(4,469,000)			(4,469,000)							(8,126,000)			(8,126,000)
Total identifiable net assets	181,987,000		99,520,000			99,520,000							172,957,000			172,957,000
Goodwill (As adjusted)	23,146,000	[4]	44,637,000	[6]		44,637,000	[6]		16,300,000	12,800,000	15,500,000		32,176,000	[4]		32,176,000	[4]						13,000,000	19,200,000
Total (As adjusted)	205,133,000		144,157,000			144,157,000							205,133,000			205,133,000			205,133,000		200,200,000
Customer receivables, gross amount due			22,100,000			22,100,000							34,700,000			34,700,000
Revenues attributable to acquiree, included in the Company's consolidated statements of income			13,100,000										58,200,000			67,800,000
Unaudited pro forma combined summary data
Pro forma combined revenues			575,010		513,253,000	1,545,216		1,392,234,000					560,130,000		527,425,000	1,537,520,000		1,422,979,000
Pro forma combined net income			35,822		36,496,000	93,372		102,460,000					37,558,000		41,378,000	91,295,000		103,795,000
Business Acquisition, Minimum Affirmative Percentage of Acquirees Shareholders Vote Required for Acquisition Approval																										66.6667%
Maximum amount of obligation of acquiree to reimburse the out of pocket expenses incurred																										1,500,000
Reimbursement received from acquiree																									1,100,000
Business Acquisition Purchase Price Allocation Asset Retirement Obligations and Remedial Liabilities	$ 0		$ (193,000)			$ (193,000)							$ (103,000)			$ (103,000)

[1] The outstanding Peak debt, net of $15.7 million of cash assumed, which consisted of three term loan facilities, was paid off on June 10, 2011.

[2] The Company previously owned a 3.15% interest in Peak which was recorded in marketable securities. On June 10, 2011, the Company acquired the remaining outstanding shares of Peak and as a result, the Company remeasured the fair value of its previously held common shares and recognized the resulting gain of $1.9 million in other income. The unrealized gain on the Peak investment was previously recorded in accumulated other comprehensive income. For this purpose, the fair value of the Company’s previous investment in Peak was deemed to be $4.1 million, calculated based on the closing price of Peak’s shares on the Toronto Stock Exchange on the date before the acquisition was publicly announced.

[3] The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary fair value of $33.3 million. The gross amount due was $34.7 million.

[4] Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $13.0 million and $19.2 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectively; however, the amount and the allocation are subject to change pending the finalization of the Company’s valuation.

[5] (i)The preliminary fair value of the financial assets acquired includes customer receivables with a preliminary aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million.

[6] (ii)Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $16.3 million, $12.8 million and $15.5 million has been assigned to the Oil and Gas Field Services segment, the Technical Services segment, and the Industrial Services segment, respectively. Certain amounts will not be deductible for tax purposes.

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ACCRUED EXPENSES (Tables)

9 Months Ended

Sep. 30, 2011

Accrued Expenses [ABSTRACT]

Accrued expenses

Accrued expenses consisted of the following (in thousands):

	September 30, 2011		December 31, 2010
Insurance	$	21,886	$	19,736
Interest	5,222		7,826
Accrued disposal costs	2,238		2,173
Accrued compensation and benefits	47,277		44,545
Income, real estate, sales and other taxes	24,637		19,529
Other	37,651		22,280
	$	138,911	$	116,089

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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Interest expense, interest income	$ 153	$ 297	$ 700	$ 564

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

9 Months Ended

Sep. 30, 2011

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

As of December 31, 2010, the Company had outstanding $270.0 million aggregate principal amount of 7.625% senior secured notes due 2016 issued by the parent company, Clean Harbors, Inc., and on March 24, 2011, the parent company issued an additional $250.0 million aggregate principal amount of such notes.  The combined $520.0 million of the parent’s senior secured notes outstanding at September 30, 2011 is guaranteed by substantially all of the parent’s subsidiaries organized in the United States. Each guarantor is a wholly-owned subsidiary of the Company and its guarantee is both full and unconditional and joint and several.  The parent’s notes are not guaranteed by the Company’s Canadian or other foreign subsidiaries. The following presents supplemental condensed consolidating financial information for the parent company, the guarantor subsidiaries and the non-guarantor subsidiaries, respectively.

Following is the condensed consolidating balance sheet at September 30, 2011 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	91,557	$	145,150	$	20,452	$	—		$	257,159
Intercompany receivables	346,750		—		148,818		(495,568		)	—
Other current assets	15,139		329,710		224,262		—			569,111
Property, plant and equipment, net	—		389,481		491,238		—			880,719
Investments in subsidiaries	1,002,994		377,275		94,626		(1,474,895		)	—
Intercompany debt receivable	—		443,819		3,701		(447,520		)	—
Other long-term assets	16,327		115,352		171,717		—			303,396
Total assets	$	1,472,767	$	1,800,787	$	1,154,814	$	(2,417,983	)	$	2,010,385
Liabilities and Stockholders’ Equity:
Current liabilities	$	39,568	$	208,021	$	145,979	$	—		$	393,568
Intercompany payables	—		495,568		—		(495,568		)	—
Closure, post-closure and remedial liabilities, net	—		131,490		20,113		—			151,603
Long-term obligations	524,590		—		—		—			524,590
Capital lease obligations, net	—		573		6,958		—			7,531
Intercompany debt payable	3,701		—		443,819		(447,520		)	—
Other long-term liabilities	64,702		8,326		19,859		—			92,887
Total liabilities	632,561		843,978		636,728		(943,088		)	1,170,179
Stockholders’ equity	840,206		956,809		518,086		(1,474,895		)	840,206
Total liabilities and stockholders’ equity	$	1,472,767	$	1,800,787	$	1,154,814	$	(2,417,983	)	$	2,010,385

Following is the condensed consolidating balance sheet at December 31, 2010 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	100,476	$	124,582	$	77,152	$	—		$	302,210
Intercompany receivables	371,559		—		—		(371,559		)	—
Other current assets	15,521		279,895		154,911		—			450,327
Property, plant and equipment, net	—		302,028		353,366		—			655,394
Investments in subsidiaries	628,723		259,294		91,654		(979,671		)	—
Intercompany debt receivable	—		368,804		3,701		(372,505		)	—
Other long-term assets	7,768		87,888		98,888		—			194,544
Total assets	$	1,124,047	$	1,422,491	$	779,672	$	(1,723,735	)	$	1,602,475
Liabilities and Stockholders’ Equity:
Current liabilities	$	13,935	$	201,384	$	90,965	$	—		$	306,284
Intercompany payables	—		222,750		148,809		(371,559		)	—
Closure, post-closure and remedial liabilities, net	—		141,280		20,494		—			161,774
Long-term obligations	264,007		—		—		—			264,007
Capital lease obligations, net	—		249		6,590		—			6,839
Intercompany debt payable	3,701		—		368,804		(372,505		)	—
Other long-term liabilities	61,577		2,531		18,636		—			82,744
Total liabilities	343,220		568,194		654,298		(744,064		)	821,648
Stockholders’ equity	780,827		854,297		125,374		(979,671		)	780,827
Total liabilities and stockholders’ equity	$	1,124,047	$	1,422,491	$	779,672	$	(1,723,735	)	$	1,602,475

Following is the consolidating statement of income for the three months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	327,093		$	237,589		$	(8,629	)	$	556,053
Cost of revenues (exclusive of items shown separately below)	—			229,272			165,875			(8,629		)	386,518
Selling, general and administrative expenses	27			39,889			25,788			—			65,704
Accretion of environmental liabilities	—			2,120			315			—			2,435
Depreciation and amortization	—			16,069			18,535			—			34,604
Income from operations	(27		)	39,743			27,076			—			66,792
Other income	—			51			113			—			164
Interest (expense) income	(10,739		)	(10		)	(178		)	—			(10,927		)
Equity in earnings of subsidiaries	52,408			18,548			—			(70,956		)	—
Intercompany dividend income (expense)	—			—			3,491			(3,491		)	—
Intercompany interest income (expense)	—			6,759			(6,759		)	—			—
Income from operations before provision for income taxes	41,642			65,091			23,743			(74,447		)	56,029
Provision for income taxes	4,509			8,335			6,052			—			18,896
Net income (loss)	$	37,133		$	56,756		$	17,691		$	(74,447	)	$	37,133

Following is the consolidating statement of income for the three months ended September 30, 2010 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	346,045	$	142,426		$	(820	)	$	487,651
Cost of revenues (exclusive of items shown separately below)	—			235,915		100,178			(820		)	335,273
Selling, general and administrative expenses	25			40,903		12,691			—			53,619
Accretion of environmental liabilities	—			2,218		277			—			2,495
Depreciation and amortization	—			12,367		10,525			—			22,892
Income from operations	(25		)	54,642		18,755			—			73,372
Other income (loss)	—			74		(743		)	—			(669		)
Loss on early extinguishment of debt	(2,294		)	—		—			—			(2,294		)
Interest (expense) income	(7,196		)	78		(80		)	—			(7,198		)
Equity in earnings of subsidiaries	56,001			8,641		—			(64,642		)	—
Intercompany dividend income (expense)	—			—		3,292			(3,292		)	—
Intercompany interest income (expense)	—			8,243		(8,243		)	—			—
Income from continuing operations before provision for income taxes	46,486			71,678		12,981			(67,934		)	63,211
Provision for income taxes	7,659			12,596		4,129			—			24,384
Income from continuing operations	38,827			59,082		8,852			(67,934		)	38,827
Income from discontinued operations, net of tax	—			—		—			—			—
Net income	$	38,827		$	59,082	$	8,852		$	(67,934	)	$	38,827

Following is the consolidating statement of income for the nine months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	838,654	$	619,615		$	(20,019	)	$	1,438,250
Cost of revenues (exclusive of items shown separately below)	—			582,767		444,101			(20,019		)	1,006,849
Selling, general and administrative expenses	77			114,621		64,054			—			178,752
Accretion of environmental liabilities	—			6,297		934			—			7,231
Depreciation and amortization	—			41,760		45,240			—			87,000
Income from operations	(77		)	93,209		65,286			—			158,418
Other income	—			3,781		2,150			—			5,931
Interest (expense) income	(28,045		)	163		(165		)	—			(28,047		)
Equity in earnings of subsidiaries	129,273			50,260		—			(179,533		)	—
Intercompany dividend income (expense)	—			—		10,484			(10,484		)	—
Intercompany interest income (expense)	—			24,459		(24,459		)	—			—
Income from operations before provision for income taxes	101,151			171,872		53,296			(190,017		)	136,302
Provision for income taxes	12,132			21,511		13,640			—			47,283
Net income	$	89,019		$	150,361	$	39,656		$	(190,017	)	$	89,019

Following is the consolidating statement of income for the nine months ended September 30, 2010 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	869,468	$	449,354		$	(4,636	)	$	1,314,186
Cost of revenues (exclusive of items shown separately below)	—			597,323		327,283			(4,636		)	919,970
Selling, general and administrative expenses	75			109,947		39,810			—			149,832
Accretion of environmental liabilities	—			6,958		841			—			7,799
Depreciation and amortization	—			35,894		31,777			—			67,671
Income from operations	(75		)	119,346		49,643			—			168,914
Other income (loss)	—			388		2,097			—			2,485
Loss on early extinguishment of debt	(2,294		)	—		—			—			(2,294		)
Interest (expense) income	(21,668		)	127		(231		)	—			(21,772		)
Equity in earnings of subsidiaries	149,216			35,457		—			(184,673		)	—
Intercompany dividend income (expense)	—			—		9,904			(9,904		)	—
Intercompany interest income (expense)	—			24,450		(24,450		)	—			—
Income from continuing operations before provision for income taxes	125,179			179,768		36,963			(194,577		)	147,333
Provision for income taxes	17,993			26,960		(2,012		)	—			42,941
Income from continuing operations	107,186			152,808		38,975			(194,577		)	104,392
Income from discontinued operations, net of tax	—			—		2,794			—			2,794
Net income	$	107,186		$	152,808	$	41,769		$	(194,577	)	$	107,186

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(16,908	)	$	77,653		$	90,591		$	151,336
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,274		)	(38,370		)	(113,644		)
Acquisitions, net of cash acquired	—			(50,166		)	(286,794		)	(336,960		)
Costs to obtain or renew permits	—			(486		)	(1,870		)	(2,356		)
Proceeds from sales of fixed assets	—			545			5,380			5,925
Proceeds from sale of marketable securities	—			—			425			425
Proceeds from sale of long term investments	—			1,000			—			1,000
Investment in subsidiaries	(258,597		)	178,884			79,713			—
Net cash from investing activities	(258,597		)	54,503			(241,516		)	(445,610		)
Cash flows from financing activities:
Change in uncashed checks	—			(1,363		)	(1,217		)	(2,580		)
Proceeds from exercise of stock options	1,089			—			—			1,089
Proceeds from employee stock purchase plan	2,451			—			—			2,451
Remittance of shares, net	(1,897		)	—			—			(1,897		)
Excess tax benefit of stock-based compensation	1,949			—			—			1,949
Deferred financing costs paid	(8,442		)	—			—			(8,442		)
Payments on capital leases	—			(532		)	(5,243		)	(5,775		)
Distribution of cash earned on employee participation plan	—			—			(189		)	(189		)
Issuance of senior secured notes, including premium	261,250			—			—			261,250
Dividends (paid) / received	10,186			(24,306		)	14,120			—
Interest (payments) / received	—			35,088			(35,088		)	—
Intercompany debt	—			(120,475		)	120,475			—
Net cash from financing activities	266,586			(111,588		)	92,858			247,856
Effect of exchange rate change on cash	—			—			1,367			1,367
(Decrease) increase in cash and cash equivalents	(8,919		)	20,568			(56,700		)	(45,051		)
Cash and cash equivalents, beginning of period	100,476			124,582			77,152			302,210
Cash and cash equivalents, end of period	$	91,557		$	145,150		$	20,452		$	257,159

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2010 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(3,688	)	$	100,673		$	56,945		$	153,930
Cash flows from investing activities:
Additions to property, plant and equipment	—			(42,501		)	(32,240		)	(74,741		)
Acquisitions, net of cash acquired	—			(13,846		)	—			(13,846		)
Additions to intangible assets, including costs to obtain or renew permits	—			(1,203		)	(2,059		)	(3,262		)
Purchase of available for sale securities	—			—			(1,486		)	(1,486		)
Proceeds from sale of fixed assets and assets held for sale	—			997			14,966			15,963
Proceeds from sale of marketable securities	—			—			2,627			2,627
Proceeds from sale of long-term investments	—			1,300			—			1,300
Proceeds from insurance settlement	—			—			1,336			1,336
Investment in subsidiaries	(236,700		)	236,700			—			—
Net cash from investing activities	(236,700		)	181,447			(16,856		)	(72,109		)
Cash flows from financing activities:
Change in uncashed checks	—			(1,347		)	(3,335		)	(4,682		)
Proceeds from exercise of stock options	550			—			—			550
Proceeds from employee stock purchase plan	1,769			—			—			1,769
Remittance of shares, net	(198		)	—			—			(198		)
Excess tax benefit of stock-based compensation	1,221			—			—			1,221
Deferred financing costs paid	(53		)	—			—			(53		)
Payments of capital leases	—			(284		)	(3,077		)	(3,361		)
Principle payment on debt	(30,000		)	—			—			(30,000		)
Distribution of cash earned on employee participation plan	—			—			(148		)	(148		)
Interest (payments) / received	—			19,363			(19,363		)	—
Intercompany debt	236,700			(236,700		)	—			—
Net cash from financing activities	209,989			(218,968		)	(25,923		)	(34,902		)
Effect of exchange rate change on cash	—			—			451			451
(Decrease) increase in cash and cash equivalents	(30,399		)	63,152			14,617			47,370
Cash and cash equivalents, beginning of period	141,338			50,408			41,800			233,546
Cash and cash equivalents, end of period	$	110,939		$	113,560		$	56,417		$	280,916

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CLOSURE AND POST-CLOSURE LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2011
Changes to post-closure liabilities
Balance at the beginning of the period	$ 38,679
Liabilities assumed in acquisitions	196
New asset retirement obligations	1,749
Accretion	2,496
Changes in estimates recorded to statement of income	(951)
Other changes in estimates recorded to balance sheet	(6,029)
Settlement of obligations	(3,452)
Currency translation and other	(182)
Balance at the end of the period	32,506
Credit-adjusted risk-free rate (as a percent)	8.79%
Inflation rate (as a percent)	1.01%
Landfill Retirement Liability
Changes to post-closure liabilities
Balance at the beginning of the period	29,756
Liabilities assumed in acquisitions
New asset retirement obligations	1,749
Accretion	1,654
Changes in estimates recorded to statement of income	(936)
Other changes in estimates recorded to balance sheet	(6,150)
Settlement of obligations	(3,011)
Currency translation and other	(141)
Balance at the end of the period	22,921
Non-Landfill Retirement Liability
Changes to post-closure liabilities
Balance at the beginning of the period	8,923
Liabilities assumed in acquisitions	196
New asset retirement obligations
Accretion	842
Changes in estimates recorded to statement of income	(15)
Other changes in estimates recorded to balance sheet	121
Settlement of obligations	(441)
Currency translation and other	(41)
Balance at the end of the period	$ 9,585

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

9 Months Ended

Sep. 30, 2011

Accounting Policies [Abstract]

Property, Plant and Equipment (excluding landfill assets)

Property, Plant and Equipment (excluding landfill assets)

Property, plant and equipment are stated at cost and include amounts capitalized under capital lease obligations. Expenditures for major renewals and improvements which extend the life of the asset are capitalized. Items of an ordinary repair or maintenance nature are charged directly to operating expense as incurred. During the construction and development period of an asset, the costs incurred, including applicable interest costs, are classified as construction-in-progress. Interest in the amount of $0.4 million and $0.3 million was capitalized to fixed assets during the nine months ended September 30, 2011, and 2010, respectively. Depreciation expense was $70.4 million and $53.9 million for the nine months ended September 30, 2011, and 2010, respectively.

The Company depreciates the cost of these assets, using the straight-line method as follows:

Asset Classification	Estimated Useful Life
Buildings and building improvements
Buildings	30—40 years
Land, leasehold and building improvements	5—40 years
Camp equipment	12—15 years
Vehicles	3—12 years
Equipment
Capitalized software and computer equipment	3 years
Solar equipment	20 years
Containers and railcars	15—20 years
All other equipment	3—10 years
Furniture and fixtures	5—8 years

Land, leasehold and building improvements have a weighted average life of 8.3 years.

Camp equipment consists of industrial lodging facilities that are utilized in the Company’s Industrial Services segment to provide lodging services to companies in the refinery and petrochemical industries.

Solar equipment consists of a solar array that is used to provide electric power for a continuously operating groundwater decontamination pump and treatment system at a closed and capped landfill located in New Jersey. The solar array was installed and became operable during the second quarter of 2011.

The Company recognizes an impairment in the carrying value of long-lived assets when the expected future undiscounted cash flows derived from the assets are less than their carrying value. For the three and nine months ended September 30, 2011, and 2010, the Company has not recorded impairment charges related to long-lived assets.

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Treasury Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Comprehensive Income	Accumulated Other Comprehensive Income	Accumulated Earnings
Balance at Dec. 31, 2010	$ 780,827	$ 528	$ (2,467)	$ (777)	$ 488,384		$ 50,759	$ 244,400
Balance (in shares) at Dec. 31, 2010		52,772
Increase (Decrease) in Stockholders' Equity
Net income	89,019					89,019		89,019
Change in fair value of available for sale securities, net of taxes	(805)					(805)	(805)
Foreign currency translation	(37,732)					(37,732)	(37,732)
Total comprehensive income						50,482
Stock-based compensation	5,305				5,305
Stock-based compensation (in shares)		184
Issuance of restricted shares, net of shares remitted	(1,897)		(1,807)
Issuance of restricted shares, net of shares remitted (in shares)		(40)
Exercise of stock options	1,089	2			1,087
Exercise of stock options (in shares)		53
Net tax benefit on exercise of stock options	1,949				1,949
Employee stock purchase plan	2,451				2,451
Employee stock purchase plan (in shares)		69
Balance at Sep. 30, 2011	$ 840,206	$ 530	$ (4,274)	$ (777)	$ 499,086		$ 12,222	$ 333,419
Balance (in shares) at Sep. 30, 2011		53,038

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FINANCING ARRANGEMENTS

9 Months Ended

Sep. 30, 2011

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS

The following table is a summary of the Company’s financing arrangements (in thousands):

	September 30, 2011		December 31, 2010
Senior secured notes, at 7.625%, due August 15, 2016	$	520,000	$	270,000
Revolving credit facility, due May 31, 2016	—		—
Unamortized notes premium and discount, net	4,590		(5,993		)
Long-term obligations	$	524,590	$	264,007

On May 31, 2011, the Company increased its previous $120.0 million revolving credit facility to a $250.0 million revolving credit facility (described below).

As of December 31, 2010, the Company had outstanding $270.0 million aggregate principal amount of 7.625% senior secured notes due 2016.  On March 24, 2011, the Company issued an additional $250.0 million aggregate principal amount of such notes (the “new notes”).  Under the purchase agreement, the new notes were priced for purposes of resale at 104.5% of the aggregate principal amount, representing an effective yield to maturity of 6.132%. In addition to such 104.5% purchase price, the purchase price paid to the Company for the new notes also included interest accrued on the new notes from and including February 15, 2011. The net proceeds from the issuance and sale of the new notes, after deducting the initial purchasers’ discount and estimated other transaction expenses, were approximately $255.7 million.

The new notes and the $270.0 million of notes issued on the initial issue date are treated as a single class for all purposes including, without limitation, waivers, amendments, redemptions and other offers to purchase. The new notes and the notes issued on the initial issue date are referred to in this report collectively as the “notes” or the “senior secured notes.”

The principal terms of the notes are as follows:

Senior Secured Notes.  The notes will mature on August 15, 2016.  The notes bear interest at a rate of 7.625% per annum. Interest is payable semi-annually on February 15 and August 15 of each year. The notes were issued pursuant to an indenture dated as of August 14, 2009 (as supplemented from time to time, the “indenture”) among the Company, as issuer, the Company’s domestic subsidiaries, as guarantors, and U.S. Bank National Association, as trustee and notes collateral agent.

The fair value of the Company’s currently outstanding notes is based on quoted market prices and was $540.8 million at September 30, 2011 and $278.3 million at December 31, 2010.

The Company may redeem some or all of the notes at any time on or after August 15, 2012 at the following redemption prices (expressed as percentages of the principal amount) if redeemed during the twelve-month period commencing on August 15 of the year set forth below, plus, in each case, accrued and unpaid interest, if any, to the date of redemption:

Year	Percentage
2012	103.813	%
2013	101.906	%
2014 and thereafter	100.000	%

At any time on or after September 29, 2011 but prior to August 15, 2012, the Company may also redeem up to $30.0 million (10% of the aggregate principal amount of the notes originally issued under the indenture) of the notes at a redemption price of 103% of the principal amount, plus any accrued and unpaid interest. Prior to August 15, 2012, the Company may also redeem up to $105.0 million (35% of the aggregate principal amount of the notes originally issued under the indenture) of the notes at a redemption price of 107.625% of the principal amount, plus any accrued and unpaid interest, using proceeds from certain equity offerings, and may also redeem some or all of the senior secured notes at a redemption price of 100% of the principal amount plus a make-whole premium and any accrued and unpaid interest. Holders may require the Company to repurchase the notes at a purchase price equal to 101% of the principal amount, plus any accrued and unpaid interest, upon a change of control of the Company.

The notes are guaranteed by substantially all the Company’s current and future domestic restricted subsidiaries. The notes are the Company’s and the guarantors’ senior secured obligations ranking equally, subject to the lien priorities summarized below, with all of the Company’s and the guarantors’ existing and future senior obligations (including obligations under the Company’s credit agreement) and senior to any future indebtedness that is expressly subordinated to the senior secured notes and the guarantees. The notes and the guarantees are secured by a first lien on substantially all of the assets of the Company and its domestic restricted subsidiaries (the “Notes Collateral”), except for accounts receivable, related general intangibles and instruments and proceeds related thereto (the “ABL Collateral”) and certain other excluded collateral as provided in the indenture and subject to certain exceptions and permitted liens. The notes and the guarantees are also secured by a second lien on the ABL Collateral that, along with a second lien on the Notes Collateral, secure the Company’s obligations under its “ABL facility” under its revolving credit agreement. The notes are not guaranteed by, or secured by the assets of, the Company’s Canadian or other foreign subsidiaries.

If the Company or its domestic subsidiaries sell assets under specified circumstances, the Company must offer to repurchase the senior secured notes from certain of the net proceeds of such sale at a purchase price equal to 100% of the principal amount, plus any accrued and unpaid interest, to the applicable repurchase date.

Revolving Credit Facility. On May 31, 2011, the Company entered into an amendment and restatement of the previously existing revolving credit facility with Bank of America, N.A. (“BofA”), as agent for the lenders under the facility.  The principal changes to the terms of the facility were to:

(i) increase the maximum amount of borrowings and letters of credit which the Company may obtain under the facility from $120.0 million to $150.0 million (with a $140.0 million sub-limit for letters of credit);

(ii) add one of the Company’s Canadian subsidiaries (the “Canadian Borrower”) as a party to the facility and allow the Canadian Borrower to obtain up to $100.0 million of borrowings and letters of credit (with a $75.0 million sub-limit for letters of credit), with the obligations of the Canadian Borrower under the facility secured by a first lien on the accounts receivable of the  Canadian Borrower and the Company’s other Canadian subsidiaries and the Company and its U.S. subsidiaries guaranteeing the obligations of the Canadian Borrower, but the Canadian Borrower and the Company’s other Canadian subsidiaries having no guarantee or other responsibility for the obligations of the Company or its U.S. subsidiaries under the facility;

(iii) reduce the interest rate on borrowings under the facility, in the case of LIBOR loans, from LIBOR plus an applicable margin ranging (based primarily on the level of the Company’s fixed charge coverage ratio for the most recently completed four fiscal quarter measurement period) from 2.25% to 2.75% per annum to LIBOR plus an applicable margin ranging from 1.75% to 2.25% per annum and, in the case of base rate loans, from BofA’s base rate plus an applicable margin ranging from 1.25% to 1.75% per annum to BofA’s base rate plus an applicable margin ranging from 0.75% to 1.25% per annum; and

(iv)  extend the term of the facility so that it will expire on the first to occur of (a) May 31, 2016 or (b) 60 days prior to the maturity of the Company’s outstanding senior secured notes on August 15, 2016 if the notes have not by then been refinanced, defeased or reserved against the borrowing base on terms reasonably acceptable to the agent under the amended and restated credit agreement.

The financing arrangements and principal terms of the revolving credit facility are discussed further in the Company’s Current Report on Form 8-K filed on June 3, 2011. There have been no material changes in such terms during the first nine months of 2011.

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Details 4) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Condensed consolidating statement of cash flows
Net cash from operating activities	$ 151,336	$ 153,930
Cash flows from investing activities:
Additions to property, plant and equipment	(113,644)	(74,741)
Acquisitions, net of cash acquired	(336,960)	(13,846)
Additions to intangible assets, including costs to obtain or renew permits	(2,356)	(3,262)
Purchase of available for sale securities	0	(1,486)
Proceeds from sales of fixed assets and assets held for sale	5,925	15,963
Proceeds from sales of marketable securities	425	2,627
Proceeds from sale of long-term investments	1,000	1,300
Proceeds from insurance settlement	0	1,336
Investment in subsidiaries	0	0
Net cash used in investing activities	(445,610)	(72,109)
Cash flows from financing activities:
Change in uncashed checks	(2,580)	(4,682)
Proceeds from exercise of stock options	1,089	550
Proceeds from employee stock purchase plan	2,451	1,769
Remittance of shares, net	(1,897)	(198)
Excess tax benefit of stock-based compensation	1,949	1,221
Deferred financing costs paid	(8,442)	(53)
Payments on capital leases	(5,775)	(3,361)
Principal payment on debt	0	(30,000)
Distribution of cash earned on employee participation plan	(189)	(148)
Issuance of senior secured notes, including premium	261,250	0
Dividends (paid) / received	0
Interest (payments) / received	0	0
Intercompany debt	0	0
Net cash from financing activities	247,856	(34,902)
Effect of exchange rate change on cash	1,367	451
(Decrease) increase in cash and cash equivalents	(45,051)	47,370
Cash and cash equivalents, beginning of period	302,210	233,546
Cash and cash equivalents, end of period	257,159	280,916
Clean Harbors, Inc.
Condensed consolidating statement of cash flows
Net cash from operating activities	(16,908)	(3,688)
Cash flows from investing activities:
Additions to property, plant and equipment	0	0
Acquisitions, net of cash acquired	0	0
Additions to intangible assets, including costs to obtain or renew permits	0	0
Purchase of available for sale securities		0
Proceeds from sales of fixed assets and assets held for sale	0	0
Proceeds from sales of marketable securities	0	0
Proceeds from sale of long-term investments	0	0
Proceeds from insurance settlement		0
Investment in subsidiaries	(258,597)	(236,700)
Net cash used in investing activities	(258,597)	(236,700)
Cash flows from financing activities:
Change in uncashed checks	0	0
Proceeds from exercise of stock options	1,089	550
Proceeds from employee stock purchase plan	2,451	1,769
Remittance of shares, net	(1,897)	(198)
Excess tax benefit of stock-based compensation	1,949	1,221
Deferred financing costs paid	(8,442)	(53)
Payments on capital leases	0	0
Principal payment on debt		(30,000)
Distribution of cash earned on employee participation plan	0	0
Issuance of senior secured notes, including premium	261,250
Dividends (paid) / received	10,186
Interest (payments) / received	0	0
Intercompany debt	0	236,700
Net cash from financing activities	266,586	209,989
Effect of exchange rate change on cash	0	0
(Decrease) increase in cash and cash equivalents	(8,919)	(30,399)
Cash and cash equivalents, beginning of period	100,476	141,338
Cash and cash equivalents, end of period	91,557	110,939
U.S. Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash from operating activities	77,653	100,673
Cash flows from investing activities:
Additions to property, plant and equipment	(75,274)	(42,501)
Acquisitions, net of cash acquired	(50,166)	(13,846)
Additions to intangible assets, including costs to obtain or renew permits	(486)	(1,203)
Purchase of available for sale securities		0
Proceeds from sales of fixed assets and assets held for sale	545	997
Proceeds from sales of marketable securities	0	0
Proceeds from sale of long-term investments	1,000	1,300
Proceeds from insurance settlement		0
Investment in subsidiaries	178,884	236,700
Net cash used in investing activities	54,503	181,447
Cash flows from financing activities:
Change in uncashed checks	(1,363)	(1,347)
Proceeds from exercise of stock options	0	0
Proceeds from employee stock purchase plan	0	0
Remittance of shares, net	0	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid	0	0
Payments on capital leases	(532)	(284)
Principal payment on debt		0
Distribution of cash earned on employee participation plan	0	0
Issuance of senior secured notes, including premium	0
Dividends (paid) / received	(24,306)
Interest (payments) / received	35,088	19,363
Intercompany debt	(120,475)	(236,700)
Net cash from financing activities	(111,588)	(218,968)
Effect of exchange rate change on cash	0	0
(Decrease) increase in cash and cash equivalents	20,568	63,152
Cash and cash equivalents, beginning of period	124,582	50,408
Cash and cash equivalents, end of period	145,150	113,560
Foreign Non-Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Net cash from operating activities	90,591	56,945
Cash flows from investing activities:
Additions to property, plant and equipment	(38,370)	(32,240)
Acquisitions, net of cash acquired	(286,794)	0
Additions to intangible assets, including costs to obtain or renew permits	(1,870)	(2,059)
Purchase of available for sale securities		(1,486)
Proceeds from sales of fixed assets and assets held for sale	5,380	14,966
Proceeds from sales of marketable securities	425	2,627
Proceeds from sale of long-term investments	0	0
Proceeds from insurance settlement		1,336
Investment in subsidiaries	79,713	0
Net cash used in investing activities	(241,516)	(16,856)
Cash flows from financing activities:
Change in uncashed checks	(1,217)	(3,335)
Proceeds from exercise of stock options	0	0
Proceeds from employee stock purchase plan	0	0
Remittance of shares, net	0	0
Excess tax benefit of stock-based compensation	0	0
Deferred financing costs paid	0	0
Payments on capital leases	(5,243)	(3,077)
Principal payment on debt		0
Distribution of cash earned on employee participation plan	(189)	(148)
Issuance of senior secured notes, including premium	0
Dividends (paid) / received	14,120
Interest (payments) / received	(35,088)	(19,363)
Intercompany debt	120,475	0
Net cash from financing activities	92,858	(25,923)
Effect of exchange rate change on cash	1,367	451
(Decrease) increase in cash and cash equivalents	(56,700)	14,617
Cash and cash equivalents, beginning of period	77,152	41,800
Cash and cash equivalents, end of period	$ 20,452	$ 56,417

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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2011

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of the total number, weighted average grant-date fair value, and types of awards granted

The following table summarizes the total number and type of awards granted during the three- and nine-month periods ended September 30, 2011, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2011			September 30, 2011
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	26,091	$	54.13	180,305	$	48.45
Performance stock awards	3,551	$	50.87	73,499	$	50.87
Total awards	29,642			253,804

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2011

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES

Legal and Administrative Proceedings

The Company’s waste management services are regulated by federal, state, provincial and local laws enacted to regulate discharge of materials into the environment, remediation of contaminated soil and groundwater or otherwise protect the environment. This ongoing regulation results in the Company frequently becoming a party to legal or administrative proceedings involving all levels of governmental authorities and other interested parties. The issues involved in such proceedings generally relate to applications for permits and licenses by the Company and conformity with legal requirements, alleged violations of existing permits and licenses, or alleged responsibility arising under federal or state Superfund laws to remediate contamination at properties owned either by the Company or by other parties (“third party sites”) to which either the Company or prior owners of certain of the Company’s facilities shipped wastes.

At September 30, 2011 and December 31, 2010, the Company had recorded reserves of $29.2 million and $29.7 million, respectively, in the Company’s financial statements for actual or probable liabilities related to the legal and administrative proceedings in which the Company was then involved, the principal of which are described below. At September 30, 2011 and December 31, 2010, the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $2.6 million and $2.8 million more, respectively. The Company periodically adjusts the aggregate amount of these reserves when these actual or probable liabilities are paid or otherwise discharged, new claims arise, or additional relevant information about existing or probable claims becomes available. As of September 30, 2011, the $29.2 million of reserves consisted of (i) $26.6 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets and (ii) $2.6 million primarily related to federal and state enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of September 30, 2011, the principal legal and administrative proceedings in which the Company was involved, or which had been terminated during 2011, were as follows:

Ville Mercier.  In September 2002, the Company acquired the stock of a subsidiary (the “Mercier Subsidiary”) which owns a hazardous waste incinerator in Ville Mercier, Quebec (the “Mercier Facility”). The property adjacent to the Mercier Facility, which is also owned by the Mercier Subsidiary, is now contaminated as a result of actions dating back to 1968, when the Government of Quebec issued to a company unrelated to the Mercier Subsidiary two permits to dump organic liquids into lagoons on the property. By 1972, groundwater contamination had been identified, and the Quebec government provided an alternate water supply to the municipality of Ville Mercier.

In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec. The lawsuits assert that the defendants are jointly and severally responsible for the contamination of groundwater in the region, which they claim caused each municipality to incur additional costs to supply drinking water for their citizens since the 1970’s and early 1980’s. The four municipalities claim a Canadian dollar (“CDN”) total of $1.6 million as damages for additional costs to obtain drinking water supplies and seek an injunctive order to obligate the defendants to remediate the groundwater in the region. The Quebec Government also sued the Mercier Subsidiary to recover approximately $17.4 million (CDN) of alleged past costs for constructing and operating a treatment system and providing alternative drinking water supplies.

On September 26, 2007, the Quebec Minister of Sustainable Development, Environment and Parks issued a Notice pursuant to Section 115.1 of the Environment Quality Act, superseding Notices issued in 1992, which are the subject of the pending litigation. The more recent Notice notifies the Mercier Subsidiary that, if the Mercier Subsidiary does not take certain remedial measures at the site, the Minister intends to undertake those measures at the site and claim direct and indirect costs related to such measures. The Mercier Subsidiary continues to assert that it has no responsibility for the groundwater contamination in the region and will contest any action by the Ministry to impose costs for remedial measures on the Mercier Subsidiary. The Company also continues to pursue settlement options. At September 30, 2011 and December 31, 2010, the Company had accrued $13.4 million and $13.5 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings.

CH El Dorado.  In August 2006, the Company purchased all of the outstanding membership interests in Teris LLC (“Teris”) and changed the name of Teris to Clean Harbors El Dorado, LLC (“CH El Dorado”). At the time of the acquisition, Teris was, and CH El Dorado now is, involved in certain legal proceedings arising from a fire on January 2, 2005, at the incineration facility owned and operated by Teris in El Dorado, Arkansas.

CH El Dorado is defending vigorously the claims asserted against Teris in those proceedings, and the Company believes that the resolution of those proceedings related to the fire will not have a material adverse effect on the Company’s financial position, results of operations or cash flows. In addition to CH El Dorado’s defenses to the lawsuits, the Company will be entitled to rely upon an indemnification from the seller of the membership interests in Teris which is contained in the purchase agreement for those interests. Under that agreement, the seller agreed to indemnify (without any deductible amount) the Company against any damages which the Company might suffer as a result of the lawsuits to the extent that such damages are not fully covered by insurance or the reserves which Teris had established on its books prior to the acquisition. The seller’s parent also guaranteed the indemnification obligation of the seller to the Company.

Deer Trail, Colorado Facility.  Since April 5, 2006, the Company has been involved in various legal proceedings which have arisen as a result of the issuance by the Colorado Department of Public Health and Environment (“CDPHE”) of a radioactive materials license (“RAD License”) to a Company subsidiary, Clean Harbors Deer Trail, LLC (“CHDT”) to accept certain low level radioactive materials known as “NORM/TENORM” wastes for disposal. Adams County, the county where the CHDT facility is located, filed two suits against the CDPHE in Colorado effectively seeking to invalidate the license. The two suits filed in 2006 were both dismissed and those dismissals were upheld by the Colorado Court of Appeals. Adams County appealed those rulings to the Colorado Supreme Court which ruled on October 13, 2009 on the procedural issue that the County did have standing to challenge the license in district court and remanded the case back to that court for further proceedings. Adams County filed a third suit directly against CHDT in 2007 again attempting to invalidate the license. That suit was dismissed on November 14, 2008, and Adams County has now appealed that dismissal to the Colorado Court of Appeals. The Company continues to believe that the grounds asserted by the County are factually and legally baseless and has contested the appeal vigorously. The Company has not recorded any liability for this matter on the basis that such liability is currently neither probable nor estimable.

Superfund Proceedings

The Company has been notified that either the Company or the prior owners of certain of the Company’s facilities for which the Company may have certain indemnification obligations have been identified as potentially responsible parties (“PRPs”) or potential PRPs in connection with 63 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 63 sites, two involve facilities that are now owned by the Company and 61 involve third party sites to which either the Company or the prior owners shipped wastes. In connection with each site, the Company has estimated the extent, if any, to which it may be subject, either directly or as a result of any such indemnification provisions, for cleanup and remediation costs, related legal and consulting costs associated with PRP investigations, settlements, and related legal and administrative proceedings. The amount of such actual and potential liability is inherently difficult to estimate because of, among other relevant factors, uncertainties as to the legal liability (if any) of the Company or the prior owners of certain of the Company’s facilities to contribute a portion of the cleanup costs, the assumptions that must be made in calculating the estimated cost and timing of remediation, the identification of other PRPs and their respective capability and obligation to contribute to remediation efforts, and the existence and legal standing of indemnification agreements (if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations.

The Company’s potential liability for cleanup costs at the two facilities now owned by the Company and at 35 (the “Listed Third Party Sites”) of the 61 third party sites arose out of the Company’s 2002 acquisition of substantially all of the assets (the “CSD assets”) of the Chemical Services Division of Safety-Kleen Corp. As part of the purchase price for the CSD assets, the Company became liable as the owner of these two facilities and also agreed to indemnify the prior owners of the CSD assets against their share of certain cleanup costs for the Listed Third Party Sites payable to governmental entities under federal or state Superfund laws. Of the 35 Listed Third Party Sites, 11 are currently requiring expenditures on remediation, ten are now settled, and 14 are not currently requiring expenditures on remediation. The status of the two facilities owned by the Company (the Wichita Property and the BR Facility) and one of the Listed Third Party Sites (the Casmalia sites) are further described below. There are also two third party sites at which the Company has been named a PRP as a result of its acquisition of the CSD assets but disputes that it has any cleanup or related liabilities; one such site (the Marine Shale site) is described below. The Company views any liabilities associated with the Marine Shale site and the other third party site as excluded liabilities under the terms of the CSD asset acquisition, but the Company is working with the EPA on a potential settlement. In addition to the CSD related Superfund sites, there are certain of the other third party sites which are not related to the Company’s acquisition of the CSD assets, and certain notifications which the Company has received about other third party sites.

Wichita Property.  The Company acquired in 2002 as part of the CSD assets a service center located in Wichita, Kansas (the “Wichita Property”). The Wichita Property is one of several properties located within the boundaries of a 1,400 acre state-designated Superfund site in an old industrial section of Wichita known as the North Industrial Corridor Site. Along with numerous other PRPs, the former owner executed a consent decree relating to such site with the EPA, and the Company is continuing its ongoing remediation program for the Wichita Property in accordance with that consent decree. The Company also acquired rights under an indemnification agreement between the former owner and an earlier owner of the Wichita Property, which the Company anticipates but cannot guarantee will be available to reimburse certain such cleanup costs.

BR Facility.  The Company acquired in 2002 as part of the CSD assets a former hazardous waste incinerator and landfill in Baton Rouge (the “BR Facility”), for which operations had been previously discontinued by the prior owner. In September 2007, the United States Environmental Protection Agency (the “EPA”) issued a special notice letter to the Company related to the Devil’s Swamp Lake Site (“Devil’s Swamp”) in East Baton Rouge Parish, Louisiana. Devil’s Swamp includes a lake located downstream of an outfall ditch where wastewater and stormwater have been discharged, and Devil’s Swamp is proposed to be included on the National Priorities List due to the presence of Contaminants of Concern (“COC”) cited by the EPA. These COCs include substances of the kind found in wastewater and storm water discharged from the BR Facility in past operations. The EPA originally requested COC generators to submit a good faith offer to conduct a remedial investigation feasibility study directed towards the eventual remediation of the site. The Company is currently performing corrective actions at the BR Facility under an order issued by the Louisiana Department of Environmental Quality (the “LDEQ”), and has begun conducting the remedial investigation and feasibility study under an order issued by the EPA. The Company cannot presently estimate the potential additional liability for the Devil’s Swamp cleanup until a final remedy is selected by the EPA.

Casmalia Site.  At one of the 35 Listed Third Party Sites, the Casmalia Resources Hazardous Waste Management Facility (the “Casmalia site”) in Santa Barbara County, California, the Company received from the EPA a request for information in May 2007. In that request, the EPA is seeking information about the extent to which, if at all, the prior owner transported or arranged for disposal of waste at the Casmalia site. The Company has not recorded any liability for this 2007 notice on the basis that such transporter or arranger liability is currently neither probable nor estimable.

Marine Shale Site.  Prior to 1996, Marine Shale Processors, Inc. (“Marine Shale”) operated a kiln in Amelia, Louisiana which incinerated waste producing a vitrified aggregate as a by-product. Marine Shale contended that its operation recycled waste into a useful product, i.e., vitrified aggregate, and therefore was exempt from regulation under the RCRA and permitting requirements as a hazardous waste incinerator under applicable federal and state environmental laws. The EPA contended that Marine Shale was a “sham-recycler” subject to the regulation and permitting requirements as a hazardous waste incinerator under RCRA, that its vitrified aggregate by-product was a hazardous waste, and that Marine Shale’s continued operation without required permits was illegal. Litigation between the EPA and Marine Shale began in 1990 and continued until July 1996, when the U.S. Fifth Circuit Court of Appeals ordered Marine Shale to shut down its operations.

On May 11, 2007, the EPA and the LDEQ issued a special notice to the Company and other PRPs, seeking a good faith offer to address site remediation at the former Marine Shale facility. Certain of the former owners of the CSD assets were major customers of Marine Shale, but the Marine Shale site was not included as a Listed Third Party Site in connection with the Company’s acquisition of the CSD assets and the Company was never a customer of Marine Shale. Although the Company believes that it is not liable (either directly or under any indemnification obligation) for cleanup costs at the Marine Shale site, the Company elected to join with other parties which had been notified that are potentially PRPs in connection with Marine Shale site to form a group (the “Site Group”) to retain common counsel and participate in further negotiations with the EPA and the LDEQ directed towards the eventual remediation of the Marine Shale site. The Site Group made a good faith settlement offer to the EPA on November 29, 2007, and negotiations among the EPA, the LDEQ and the Site Group with respect to the Marine Shale site are ongoing. At September 30, 2011 and December 31, 2010, the amount of the Company’s reserves relating to the Marine Shale site was $3.9 million and $3.8 million, respectively.

Certain Other Third Party Sites.  At 14 of the 61 third party sites, the Company has an indemnification agreement with ChemWaste, a former subsidiary of Waste Management, Inc. and the prior owner. The agreement indemnifies the Company with respect to any liability at the 14 sites for waste disposed prior to the Company’s acquisition of the sites. Accordingly, Waste Management is paying all costs of defending those subsidiaries in those 14 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company’s ultimate liabilities for these sites will not exceed the amount recorded or that indemnities applicable to any of these sites will be available to pay all or a portion of related costs. The Company does not have an indemnity agreement with respect to any of the other remaining 61 third party sites not discussed above. However, the Company believes that its additional potential liability, if any, to contribute to the cleanup of such remaining sites will not, in the aggregate, exceed $100,000.

Other Notifications.  Between September 2004 and May 2006, the Company also received notices from certain of the prior owners of the CSD assets seeking indemnification from the Company at five third party sites which are not included in the third party sites described above that have been designated as Superfund sites or potential Superfund sites and for which those prior owners have been identified as PRPs or potential PRPs. The Company has responded to such letters asserting that the Company has no obligation to indemnify those prior owners for any cleanup and related costs (if any) which they may incur in connection with these five sites. The Company intends to assist those prior owners by providing information that is now in the Company’s possession with respect to those five sites and, if appropriate, to participate in negotiations with the government agencies and PRP groups involved. The Company has also investigated the sites to determine the existence of potential liabilities independent from the liability of those former owners, and concluded that at this time the Company is not liable for any portion of the potential cleanup of the five sites and therefore has not established a reserve.

Federal, State and Provincial Enforcement Actions

From time to time, the Company pays fines or penalties in regulatory proceedings relating primarily to waste treatment, storage or disposal facilities. As of September 30, 2011 and December 31, 2010, there were one and three proceedings, respectively, for which the Company reasonably believed that the sanctions could equal or exceed $100,000. During the nine months ended September 30, 2011, the Company resolved two matters with no impact to the Company's financial results of operations. The Company does not believe that the fines or other penalties in these or any of the other regulatory proceedings will, individually or in the aggregate, have a material adverse effect on its financial condition or results of operations.

Other Contingencies

In December 2010, the Company paid $10.5 million to acquire a minority interest in a privately-held company. Subsequent to the purchase of those securities but prior to December 31, 2010, the privately-held company exercised its irrevocable call right for those shares and tendered payment for a total of $10.5 million. The Company is disputing the fair value asserted by the privately-held company and believes that the shares had a fair value on the date of the exercise of the call right greater than the amount tendered. Due to the exercise of the irrevocable call right, the Company did not own those shares of that privately-held company as of December 31, 2010, and accordingly has recorded the $10.5 million in prepaid expenses and other current assets. The potential recovery of any additional amount depends upon several contested factors, and is considered a gain contingency and therefore has not been recorded in the Company’s consolidated financial statements. At September 30, 2011, the Company still has $10.5 million recorded in prepaid expenses and other current assets.

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 257,159	$ 302,210
Marketable securities	93	3,174
Accounts receivable, net of allowances aggregating $14,285 and $23,704, respectively	414,079	332,678
Unbilled accounts receivable	41,728	19,117
Deferred costs	5,831	6,891
Prepaid expenses and other current assets	37,278	28,939
Supplies inventories	53,614	44,546
Deferred tax assets	16,488	14,982
Total current assets	826,270	752,537
Property, plant and equipment:
Land	36,664	31,654
Asset retirement costs (non-landfill)	2,353	2,242
Landfill assets	51,935	54,519
Buildings and improvements	184,242	147,285
Camp equipment	102,683	62,717
Vehicles	218,111	162,397
Equipment	696,638	537,937
Furniture and fixtures	3,635	2,293
Construction in progress	32,841	33,005
Property, plant and equipment, gross	1,329,102	1,034,049
Less-accumulated depreciation and amortization	448,383	378,655
Total property, plant and equipment, net	880,719	655,394
Other assets:
Long-term investments	4,239	5,437
Deferred financing costs	14,325	7,768
Goodwill	134,696	60,252
Permits and other intangibles, net of accumulated amortization of $68,531 and $60,633, respectively	140,970	114,400
Other	9,166	6,687
Total other assets	303,396	194,544
Total assets	2,010,385	1,602,475
Current liabilities:
Current portion of capital lease obligations	8,570	7,954
Accounts payable	201,561	136,978
Deferred revenue	28,627	30,745
Accrued expenses	138,911	116,089
Current portion of closure, post-closure and remedial liabilities	15,899	14,518
Total current liabilities	393,568	306,284
Other liabilities:
Closure and post-closure liabilities, less current portion of $5,086 and $5,849, respectively	27,420	32,830
Remedial liabilities, less current portion of $10,813 and $8,669, respectively	124,183	128,944
Long-term obligations	524,590	264,007
Capital lease obligations, less current portion	7,531	6,839
Unrecognized tax benefits and other long-term liabilities	92,887	82,744
Total other liabilities	776,611	515,364
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 53,038,399 and 52,772,392 shares, respectively	530	528
Treasury stock	(4,274)	(2,467)
Shares held under employee participation plan	(777)	(777)
Additional paid-in capital	499,086	488,384
Accumulated other comprehensive income	12,222	50,759
Accumulated earnings	333,419	244,400
Total stockholders' equity	840,206	780,827
Total liabilities and stockholders' equity	$ 2,010,385	$ 1,602,475

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)

9 Months Ended

Sep. 30, 2011

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

Schedule of condensed consolidating balance sheet

Following is the condensed consolidating balance sheet at September 30, 2011 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	91,557	$	145,150	$	20,452	$	—		$	257,159
Intercompany receivables	346,750		—		148,818		(495,568		)	—
Other current assets	15,139		329,710		224,262		—			569,111
Property, plant and equipment, net	—		389,481		491,238		—			880,719
Investments in subsidiaries	1,002,994		377,275		94,626		(1,474,895		)	—
Intercompany debt receivable	—		443,819		3,701		(447,520		)	—
Other long-term assets	16,327		115,352		171,717		—			303,396
Total assets	$	1,472,767	$	1,800,787	$	1,154,814	$	(2,417,983	)	$	2,010,385
Liabilities and Stockholders’ Equity:
Current liabilities	$	39,568	$	208,021	$	145,979	$	—		$	393,568
Intercompany payables	—		495,568		—		(495,568		)	—
Closure, post-closure and remedial liabilities, net	—		131,490		20,113		—			151,603
Long-term obligations	524,590		—		—		—			524,590
Capital lease obligations, net	—		573		6,958		—			7,531
Intercompany debt payable	3,701		—		443,819		(447,520		)	—
Other long-term liabilities	64,702		8,326		19,859		—			92,887
Total liabilities	632,561		843,978		636,728		(943,088		)	1,170,179
Stockholders’ equity	840,206		956,809		518,086		(1,474,895		)	840,206
Total liabilities and stockholders’ equity	$	1,472,767	$	1,800,787	$	1,154,814	$	(2,417,983	)	$	2,010,385

Following is the condensed consolidating balance sheet at December 31, 2010 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	100,476	$	124,582	$	77,152	$	—		$	302,210
Intercompany receivables	371,559		—		—		(371,559		)	—
Other current assets	15,521		279,895		154,911		—			450,327
Property, plant and equipment, net	—		302,028		353,366		—			655,394
Investments in subsidiaries	628,723		259,294		91,654		(979,671		)	—
Intercompany debt receivable	—		368,804		3,701		(372,505		)	—
Other long-term assets	7,768		87,888		98,888		—			194,544
Total assets	$	1,124,047	$	1,422,491	$	779,672	$	(1,723,735	)	$	1,602,475
Liabilities and Stockholders’ Equity:
Current liabilities	$	13,935	$	201,384	$	90,965	$	—		$	306,284
Intercompany payables	—		222,750		148,809		(371,559		)	—
Closure, post-closure and remedial liabilities, net	—		141,280		20,494		—			161,774
Long-term obligations	264,007		—		—		—			264,007
Capital lease obligations, net	—		249		6,590		—			6,839
Intercompany debt payable	3,701		—		368,804		(372,505		)	—
Other long-term liabilities	61,577		2,531		18,636		—			82,744
Total liabilities	343,220		568,194		654,298		(744,064		)	821,648
Stockholders’ equity	780,827		854,297		125,374		(979,671		)	780,827
Total liabilities and stockholders’ equity	$	1,124,047	$	1,422,491	$	779,672	$	(1,723,735	)	$	1,602,475

Schedule of consolidating statement of income

Following is the consolidating statement of income for the three months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	327,093		$	237,589		$	(8,629	)	$	556,053
Cost of revenues (exclusive of items shown separately below)	—			229,272			165,875			(8,629		)	386,518
Selling, general and administrative expenses	27			39,889			25,788			—			65,704
Accretion of environmental liabilities	—			2,120			315			—			2,435
Depreciation and amortization	—			16,069			18,535			—			34,604
Income from operations	(27		)	39,743			27,076			—			66,792
Other income	—			51			113			—			164
Interest (expense) income	(10,739		)	(10		)	(178		)	—			(10,927		)
Equity in earnings of subsidiaries	52,408			18,548			—			(70,956		)	—
Intercompany dividend income (expense)	—			—			3,491			(3,491		)	—
Intercompany interest income (expense)	—			6,759			(6,759		)	—			—
Income from operations before provision for income taxes	41,642			65,091			23,743			(74,447		)	56,029
Provision for income taxes	4,509			8,335			6,052			—			18,896
Net income (loss)	$	37,133		$	56,756		$	17,691		$	(74,447	)	$	37,133

Following is the consolidating statement of income for the three months ended September 30, 2010 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	346,045	$	142,426		$	(820	)	$	487,651
Cost of revenues (exclusive of items shown separately below)	—			235,915		100,178			(820		)	335,273
Selling, general and administrative expenses	25			40,903		12,691			—			53,619
Accretion of environmental liabilities	—			2,218		277			—			2,495
Depreciation and amortization	—			12,367		10,525			—			22,892
Income from operations	(25		)	54,642		18,755			—			73,372
Other income (loss)	—			74		(743		)	—			(669		)
Loss on early extinguishment of debt	(2,294		)	—		—			—			(2,294		)
Interest (expense) income	(7,196		)	78		(80		)	—			(7,198		)
Equity in earnings of subsidiaries	56,001			8,641		—			(64,642		)	—
Intercompany dividend income (expense)	—			—		3,292			(3,292		)	—
Intercompany interest income (expense)	—			8,243		(8,243		)	—			—
Income from continuing operations before provision for income taxes	46,486			71,678		12,981			(67,934		)	63,211
Provision for income taxes	7,659			12,596		4,129			—			24,384
Income from continuing operations	38,827			59,082		8,852			(67,934		)	38,827
Income from discontinued operations, net of tax	—			—		—			—			—
Net income	$	38,827		$	59,082	$	8,852		$	(67,934	)	$	38,827

Following is the consolidating statement of income for the nine months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	838,654	$	619,615		$	(20,019	)	$	1,438,250
Cost of revenues (exclusive of items shown separately below)	—			582,767		444,101			(20,019		)	1,006,849
Selling, general and administrative expenses	77			114,621		64,054			—			178,752
Accretion of environmental liabilities	—			6,297		934			—			7,231
Depreciation and amortization	—			41,760		45,240			—			87,000
Income from operations	(77		)	93,209		65,286			—			158,418
Other income	—			3,781		2,150			—			5,931
Interest (expense) income	(28,045		)	163		(165		)	—			(28,047		)
Equity in earnings of subsidiaries	129,273			50,260		—			(179,533		)	—
Intercompany dividend income (expense)	—			—		10,484			(10,484		)	—
Intercompany interest income (expense)	—			24,459		(24,459		)	—			—
Income from operations before provision for income taxes	101,151			171,872		53,296			(190,017		)	136,302
Provision for income taxes	12,132			21,511		13,640			—			47,283
Net income	$	89,019		$	150,361	$	39,656		$	(190,017	)	$	89,019

Following is the consolidating statement of income for the nine months ended September 30, 2010 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	869,468	$	449,354		$	(4,636	)	$	1,314,186
Cost of revenues (exclusive of items shown separately below)	—			597,323		327,283			(4,636		)	919,970
Selling, general and administrative expenses	75			109,947		39,810			—			149,832
Accretion of environmental liabilities	—			6,958		841			—			7,799
Depreciation and amortization	—			35,894		31,777			—			67,671
Income from operations	(75		)	119,346		49,643			—			168,914
Other income (loss)	—			388		2,097			—			2,485
Loss on early extinguishment of debt	(2,294		)	—		—			—			(2,294		)
Interest (expense) income	(21,668		)	127		(231		)	—			(21,772		)
Equity in earnings of subsidiaries	149,216			35,457		—			(184,673		)	—
Intercompany dividend income (expense)	—			—		9,904			(9,904		)	—
Intercompany interest income (expense)	—			24,450		(24,450		)	—			—
Income from continuing operations before provision for income taxes	125,179			179,768		36,963			(194,577		)	147,333
Provision for income taxes	17,993			26,960		(2,012		)	—			42,941
Income from continuing operations	107,186			152,808		38,975			(194,577		)	104,392
Income from discontinued operations, net of tax	—			—		2,794			—			2,794
Net income	$	107,186		$	152,808	$	41,769		$	(194,577	)	$	107,186

Schedule of condensed consolidating statement of cash flows

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2011 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(16,908	)	$	77,653		$	90,591		$	151,336
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,274		)	(38,370		)	(113,644		)
Acquisitions, net of cash acquired	—			(50,166		)	(286,794		)	(336,960		)
Costs to obtain or renew permits	—			(486		)	(1,870		)	(2,356		)
Proceeds from sales of fixed assets	—			545			5,380			5,925
Proceeds from sale of marketable securities	—			—			425			425
Proceeds from sale of long term investments	—			1,000			—			1,000
Investment in subsidiaries	(258,597		)	178,884			79,713			—
Net cash from investing activities	(258,597		)	54,503			(241,516		)	(445,610		)
Cash flows from financing activities:
Change in uncashed checks	—			(1,363		)	(1,217		)	(2,580		)
Proceeds from exercise of stock options	1,089			—			—			1,089
Proceeds from employee stock purchase plan	2,451			—			—			2,451
Remittance of shares, net	(1,897		)	—			—			(1,897		)
Excess tax benefit of stock-based compensation	1,949			—			—			1,949
Deferred financing costs paid	(8,442		)	—			—			(8,442		)
Payments on capital leases	—			(532		)	(5,243		)	(5,775		)
Distribution of cash earned on employee participation plan	—			—			(189		)	(189		)
Issuance of senior secured notes, including premium	261,250			—			—			261,250
Dividends (paid) / received	10,186			(24,306		)	14,120			—
Interest (payments) / received	—			35,088			(35,088		)	—
Intercompany debt	—			(120,475		)	120,475			—
Net cash from financing activities	266,586			(111,588		)	92,858			247,856
Effect of exchange rate change on cash	—			—			1,367			1,367
(Decrease) increase in cash and cash equivalents	(8,919		)	20,568			(56,700		)	(45,051		)
Cash and cash equivalents, beginning of period	100,476			124,582			77,152			302,210
Cash and cash equivalents, end of period	$	91,557		$	145,150		$	20,452		$	257,159

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2010 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(3,688	)	$	100,673		$	56,945		$	153,930
Cash flows from investing activities:
Additions to property, plant and equipment	—			(42,501		)	(32,240		)	(74,741		)
Acquisitions, net of cash acquired	—			(13,846		)	—			(13,846		)
Additions to intangible assets, including costs to obtain or renew permits	—			(1,203		)	(2,059		)	(3,262		)
Purchase of available for sale securities	—			—			(1,486		)	(1,486		)
Proceeds from sale of fixed assets and assets held for sale	—			997			14,966			15,963
Proceeds from sale of marketable securities	—			—			2,627			2,627
Proceeds from sale of long-term investments	—			1,300			—			1,300
Proceeds from insurance settlement	—			—			1,336			1,336
Investment in subsidiaries	(236,700		)	236,700			—			—
Net cash from investing activities	(236,700		)	181,447			(16,856		)	(72,109		)
Cash flows from financing activities:
Change in uncashed checks	—			(1,347		)	(3,335		)	(4,682		)
Proceeds from exercise of stock options	550			—			—			550
Proceeds from employee stock purchase plan	1,769			—			—			1,769
Remittance of shares, net	(198		)	—			—			(198		)
Excess tax benefit of stock-based compensation	1,221			—			—			1,221
Deferred financing costs paid	(53		)	—			—			(53		)
Payments of capital leases	—			(284		)	(3,077		)	(3,361		)
Principle payment on debt	(30,000		)	—			—			(30,000		)
Distribution of cash earned on employee participation plan	—			—			(148		)	(148		)
Interest (payments) / received	—			19,363			(19,363		)	—
Intercompany debt	236,700			(236,700		)	—			—
Net cash from financing activities	209,989			(218,968		)	(25,923		)	(34,902		)
Effect of exchange rate change on cash	—			—			451			451
(Decrease) increase in cash and cash equivalents	(30,399		)	63,152			14,617			47,370
Cash and cash equivalents, beginning of period	141,338			50,408			41,800			233,546
Cash and cash equivalents, end of period	$	110,939		$	113,560		$	56,417		$	280,916

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STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011
Awards granted
Shares	29,642	253,804
Authorized stock split declared, number of shares per each share held		2
Restricted stock awards
Awards granted
Shares	26,091	180,305
Weighted-Average Grant-Date Fair Value (in dollars per share)	$ 54.13	$ 48.45
Performance stock awards
Awards granted
Shares	3,551	73,499
Weighted-Average Grant-Date Fair Value (in dollars per share)	$ 50.87	$ 50.87

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REMEDIAL LIABILITIES (Details) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011
Changes to remedial liabilities
Balance at the beginning of the period	$ 137,613
Liabilities assumed in acquisitions	100
Accretion	4,735
Changes in estimates recorded to statement of income	(1,516)
Settlement of obligations	(5,099)
Currency translation and other	(837)
Balance at the end of the period	134,996
Remedial Liabilities for Landfill Sites
Changes to remedial liabilities
Balance at the beginning of the period	5,511
Liabilities assumed in acquisitions	0
Accretion	203
Changes in estimates recorded to statement of income	(8)
Settlement of obligations	(49)
Currency translation and other	(134)
Balance at the end of the period	5,523
Remedial Liabilities for Inactive Sites
Changes to remedial liabilities
Balance at the beginning of the period	82,354
Liabilities assumed in acquisitions	0
Accretion	2,849
Changes in estimates recorded to statement of income	(933)
Settlement of obligations	(2,741)
Currency translation and other	(7)
Balance at the end of the period	81,522
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Changes to remedial liabilities
Balance at the beginning of the period	49,748
Liabilities assumed in acquisitions	100
Accretion	1,683
Changes in estimates recorded to statement of income	(575)
Settlement of obligations	(2,309)
Currency translation and other	(696)
Balance at the end of the period	$ 47,951

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FINANCING ARRANGEMENTS (Details) (USD $)				9 Months Ended		1 Months Ended	9 Months Ended			1 Months Ended								9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Redeemable Debt Redemption Rate of 103 Percent [Member] Maximum [Member] Senior secured notes	Sep. 30, 2011 Redeemable Debt Redemption Rate of 103 Percent [Member] Senior secured notes	Sep. 30, 2011 Redeemable Debt Redemption Rate of 107.625 Percent [Member] Senior secured notes	Mar. 31, 2011 Senior secured notes	Sep. 30, 2011 Senior secured notes	Dec. 31, 2010 Senior secured notes	May 31, 2011 Revolving credit facility	May 31, 2011 Revolving credit facility Canadian subsidiaries	Sep. 30, 2011 Revolving credit facility LIBOR loans	Sep. 30, 2011 Revolving credit facility Base rate loans	May 31, 2011 Letters of credit	May 31, 2011 Letters of credit Canadian subsidiaries	May 31, 2011 Previous revolving credit facility	Sep. 30, 2011 Previous revolving credit facility LIBOR loans	Sep. 30, 2011 Previous revolving credit facility Base rate loans	Sep. 30, 2011 LIBOR loans	Sep. 30, 2011 Base rate loans
Financing arrangements
Maximum Amount Of Redeemable Debt Instruments prior to August 2012 at a Price of 103			$ 30,000,000		$ 105,000,000
Senior secured notes, at 7.625%, due on August 15, 2016							520,000,000	270,000,000
Senior secured notes, interest rate (as a percent)								7.625%
Debt Instrument, Increase, Additional Borrowings						250,000,000
Revolving credit facility, due May 31, 2016
Unamortized notes premium and discount, net							4,590,000	(5,993,000)
Long-term obligations	524,590,000	264,007,000					524,590,000	264,007,000
Revolving credit facility, maximum borrowing capacity	250,000,000								150,000,000	100,000,000			140,000,000	75,000,000	120,000,000
Purchase price of debt instrument under purchase agreement (as a percent)							104.50%
Effective yield to maturity on debt instrument (as a percent)							6.132%
Net proceeds from issuance and sale of new notes, after deducting initial purchasers' discount and estimated other transaction expenses							255,700,000
Fair-value of outstanding long-term debt							$ 540,800,000	$ 278,300,000
Maximum percentage of the aggregate principal amount of notes redeemable on or after September 29, 2011 but prior to August 15, 2012 (as a percent)				10.00%
2012 redemption price as a percentage of the principle amount (as a percent)							103.813%
2013 redemption price as a percentage of the principle amount (as a percent)							101.906%
2014 and thereafter redemption price as a percentage of the principle amount (as a percent)							100.00%
Maximum percentage of the aggregate principal amount of notes redeemable on or after September 29, 2011 but prior to August 15, 2012 (as a percent)				103.00%
Maximum percentage of the aggregate principal amount of notes redeemable prior to August 15, 2012 with net proceeds of certain equity offerings (as a percent)					35.00%
Percentage of redemption price to principle amount (as a percent)					107.625%
Percentage of principal amount at which the entity may redeem some or all of the notes prior to April 1, 2013 (as a percent)							100.00%
Percentage of principal amount at which notes may be required to be repurchased in event of change of control (as a percent)							101.00%
Percentage of principal amount at which notes may be required to be repurchased in event of sale of assets under specified circumstances (as a percent)							100.00%
Number of subsidiaries to be added as a party to the facility										1
Variable interest rate, basis																		LIBOR	BofA’s base rate
Applicable margin on variable interest rate basis, low end of range (as a percent)											1.75%	0.75%				2.25%	1.25%
Applicable margin on variable interest rate basis, high end of range (as a percent)											2.25%	1.25%				2.75%	1.75%

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Details 3) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidating statement of income
Revenues	$ 556,053	$ 487,651	$ 1,438,250	$ 1,314,186
Cost of revenues (exclusive of items shown separately below)	386,518	335,273	1,006,849	919,970
Selling, general and administrative expenses	65,704	53,619	178,752	149,832
Accretion of environmental liabilities	2,435	2,495	7,231	7,799
Depreciation and amortization	34,604	22,892	87,000	67,671
Income from operations	66,792	73,372	158,418	168,914
Other income	164	(669)	5,931	2,485
Loss on early extinguishment of debt	0	(2,294)	0	(2,294)
Interest (expense) income	(10,927)	(7,198)	(28,047)	(21,772)
Equity in earnings of subsidiaries	0	0	0	0
Intercompany dividend income (expense)	0	0	0	0
Intercompany interest income (expense)	0	0	0	0
Income from continuing operations, before provision for income taxes	56,029	63,211	136,302	147,333
Provision for income taxes	18,896	24,384	47,283	42,941
Income from continuing operations	37,133	38,827	89,019	104,392
Income from discontinued operations, net of tax				2,794
Net income	37,133	38,827	89,019	107,186
Clean Harbors, Inc.
Consolidating statement of income
Revenues	0	0	0	0
Cost of revenues (exclusive of items shown separately below)	0	0	0	0
Selling, general and administrative expenses	27	25	77	75
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Income from operations	(27)	(25)	(77)	(75)
Other income	0	0	0	0
Loss on early extinguishment of debt		(2,294)		(2,294)
Interest (expense) income	(10,739)	(7,196)	(28,045)	(21,668)
Equity in earnings of subsidiaries	52,408	56,001	129,273	149,216
Intercompany dividend income (expense)	0	0	0	0
Intercompany interest income (expense)	0	0	0	0
Income from continuing operations, before provision for income taxes	41,642	46,486	101,151	125,179
Provision for income taxes	4,509	7,659	12,132	17,993
Income from continuing operations		38,827		107,186
Income from discontinued operations, net of tax		0		0
Net income	37,133	38,827	89,019	107,186
U.S. Guarantor Subsidiaries
Consolidating statement of income
Revenues	327,093	346,045	838,654	869,468
Cost of revenues (exclusive of items shown separately below)	229,272	235,915	582,767	597,323
Selling, general and administrative expenses	39,889	40,903	114,621	109,947
Accretion of environmental liabilities	2,120	2,218	6,297	6,958
Depreciation and amortization	16,069	12,367	41,760	35,894
Income from operations	39,743	54,642	93,209	119,346
Other income	51	74	3,781	388
Loss on early extinguishment of debt		0		0
Interest (expense) income	(10)	78	163	127
Equity in earnings of subsidiaries	18,548	8,641	50,260	35,457
Intercompany dividend income (expense)	0	0	0	0
Intercompany interest income (expense)	6,759	8,243	24,459	24,450
Income from continuing operations, before provision for income taxes	65,091	71,678	171,872	179,768
Provision for income taxes	8,335	12,596	21,511	26,960
Income from continuing operations		59,082		152,808
Income from discontinued operations, net of tax		0		0
Net income	56,756	59,082	150,361	152,808
Foreign Non-Guarantor Subsidiaries
Consolidating statement of income
Revenues	237,589	142,426	619,615	449,354
Cost of revenues (exclusive of items shown separately below)	165,875	100,178	444,101	327,283
Selling, general and administrative expenses	25,788	12,691	64,054	39,810
Accretion of environmental liabilities	315	277	934	841
Depreciation and amortization	18,535	10,525	45,240	31,777
Income from operations	27,076	18,755	65,286	49,643
Other income	113	(743)	2,150	2,097
Loss on early extinguishment of debt		0		0
Interest (expense) income	(178)	(80)	(165)	(231)
Equity in earnings of subsidiaries	0	0	0	0
Intercompany dividend income (expense)	3,491	3,292	10,484	9,904
Intercompany interest income (expense)	(6,759)	(8,243)	(24,459)	(24,450)
Income from continuing operations, before provision for income taxes	23,743	12,981	53,296	36,963
Provision for income taxes	6,052	4,129	13,640	(2,012)
Income from continuing operations		8,852		38,975
Income from discontinued operations, net of tax		0		2,794
Net income	17,691	8,852	39,656	41,769
Consolidating Adjustments
Consolidating statement of income
Revenues	(8,629)	(820)	(20,019)	(4,636)
Cost of revenues (exclusive of items shown separately below)	(8,629)	(820)	(20,019)	(4,636)
Selling, general and administrative expenses	0	0	0	0
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Income from operations	0	0	0	0
Other income	0	0	0	0
Loss on early extinguishment of debt		0		0
Interest (expense) income	0	0	0	0
Equity in earnings of subsidiaries	(70,956)	(64,642)	(179,533)	(184,673)
Intercompany dividend income (expense)	(3,491)	(3,292)	(10,484)	(9,904)
Intercompany interest income (expense)	0	0	0	0
Income from continuing operations, before provision for income taxes	(74,447)	(67,934)	(190,017)	(194,577)
Provision for income taxes	0	0	0	0
Income from continuing operations		(67,934)		(194,577)
Income from discontinued operations, net of tax		0		0
Net income	$ (74,447)	$ (67,934)	$ (190,017)	$ (194,577)

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BASIS OF PRESENTATION (Details)	9 Months Ended
	Sep. 30, 2011	Jun. 08, 2011	Dec. 31, 2010
Authorized stock split declared, number of shares per each share held	2
Common stock, authorized shares, prior to increase (in shares)		40,000,000
Common stock, Authorized shares (in shares)	80,000,000	80,000,000	80,000,000
Number of operating segments	4