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, 2012
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 or Other Jurisdiction of Incorporation or Organization)	(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 12 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	53,426,174
(Class)	(Outstanding as of November 5, 2012)

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 Comprehensive Income (Loss)	4
Unaudited Consolidated Statements of Cash Flows	5
Unaudited Consolidated Statements of Stockholders’ Equity	6
Notes to Unaudited Consolidated Financial Statements	7
ITEM 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations	28
ITEM 3: Quantitative and Qualitative Disclosures About Market Risk	40
ITEM 4: Controls and Procedures	41
PART II: OTHER INFORMATION
Item 1: Legal Proceedings	42
Item 1A: Risk Factors	42
Item 5: Other Information	42
Item 6: Exhibits	44
Signatures	45

CLEAN HARBORS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

ASSETS

(in thousands)

	September 30, 2012		December 31, 2011
	(unaudited)
Current assets:
Cash and cash equivalents	$	523,614	$	260,723
Marketable securities	11,113		111
Accounts receivable, net of allowances aggregating $11,103 and $12,683, respectively	399,362		449,553
Unbilled accounts receivable	34,401		29,385
Deferred costs	6,995		5,903
Prepaid expenses and other current assets	53,252		73,349
Supplies inventories	63,934		56,242
Deferred tax assets	16,617		16,602
Total current assets	1,109,288		891,868
Property, plant and equipment:
Land	37,735		37,185
Asset retirement costs (non-landfill)	2,565		2,529
Landfill assets	69,544		58,466
Buildings and improvements	196,612		189,445
Camp equipment	136,797		110,242
Vehicles	281,690		231,980
Equipment	806,177		729,154
Furniture and fixtures	3,993		3,759
Construction in progress	51,466		24,522
	1,586,579		1,387,282
Less—accumulated depreciation and amortization	583,165		483,335
Total property, plant and equipment, net	1,003,414		903,947
Other assets:
Long-term investments	4,326		4,245
Deferred financing costs	12,530		13,607
Goodwill	157,724		122,392
Permits and other intangibles, net	151,810		139,644
Other	10,311		10,100
Total other assets	336,701		289,988
Total assets	$	2,449,403	$	2,085,803

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

(dollars in thousands)

	September 30, 2012			December 31, 2011
	(unaudited)
Current liabilities:
Current portion of capital lease obligations	$	5,937		$	8,310
Accounts payable	174,327			178,084
Deferred revenue	29,060			32,297
Accrued expenses	136,687			147,992
Current portion of closure, post-closure and remedial liabilities	19,552			15,059
Total current liabilities	365,563			381,742
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,921 and $3,885, respectively	29,712			30,996
Remedial liabilities, less current portion of $12,631 and $11,174, respectively	117,981			124,146
Long-term obligations	800,000			524,203
Capital lease obligations, less current portion	3,477			6,375
Unrecognized tax benefits and other long-term liabilities	125,915			117,354
Total other liabilities	1,077,085			803,074
Stockholders’ equity:
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 53,386,280 and 53,182,859  shares, respectively	534			532
Shares held under employee participation plan	(469		)	(469		)
Additional paid-in capital	508,182			497,919
Accumulated other comprehensive income	59,056			31,353
Accumulated earnings	439,452			371,652
Total stockholders’ equity	1,006,755			900,987
Total liabilities and stockholders’ equity	$	2,449,403		$	2,085,803

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,
	2012			2011			2012			2011
Revenues	$	533,806		$	556,053		$	1,628,946		$	1,438,250
Cost of revenues (exclusive of items shown separately below)	372,940			386,518			1,140,878			1,006,849
Selling, general and administrative expenses	60,339			65,704			197,892			178,752
Accretion of environmental liabilities	2,488			2,435			7,409			7,231
Depreciation and amortization	41,300			34,604			116,794			87,000
Income from operations	56,739			66,792			165,973			158,418
Other (expense) income	(91		)	164			(465		)	5,931
Loss on early extinguishment of debt	(26,385		)	—			(26,385		)	—
Interest expense, net of interest income of $221 and $623 for the quarter and year-to-date ended 2012 and $153 and $700 for the quarter and year-to-date ended 2011, respectively	(11,596		)	(10,927		)	(33,836		)	(28,047		)
Income before provision for income taxes	18,667			56,029			105,287			136,302
Provision for income taxes	6,308			18,896			37,487			47,283
Net income	$	12,359		$	37,133		$	67,800		$	89,019
Earnings per share:
Basic	$	0.23		$	0.70		$	1.27		$	1.68
Diluted	$	0.23		$	0.70		$	1.27		$	1.67
Weighted average common shares outstanding - basic	53,374			53,023			53,303			52,921
Weighted average common shares outstanding - diluted	53,565			53,370			53,519			53,298

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

3

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(in thousands)

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2012		2011			2012		2011
Net income	$	12,359	$	37,133		$	67,800	$	89,019
Other comprehensive income:
Unrealized gains (losses) on available-for-sale securities (net of taxes of $146 and $63 for the quarter and year-to-date 2012 and $33 and $211 for the quarter and year-to-date 2011, respectively)	894		(14		)	310		(805		)
Foreign currency translation adjustments	29,086		(58,130		)	27,393		(37,732		)
Other comprehensive income (loss)	29,980		(58,144		)	27,703		(38,537		)
Comprehensive income (loss)	$	42,339	$	(21,011	)	$	95,503	$	50,482

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

4

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Nine Months Ended
	September 30,
	2012			2011
Cash flows from operating activities:
Net income	$	67,800		$	89,019
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	116,794			87,000
Allowance for doubtful accounts	809			623
Amortization of deferred financing costs and debt discount	1,173			1,230
Accretion of environmental liabilities	7,409			7,231
Changes in environmental liability estimates	(3,553		)	(2,467		)
Deferred income taxes	(494		)	(197		)
Stock-based compensation	5,235			5,329
Excess tax benefit of stock-based compensation	(1,786		)	(1,949		)
Income tax benefit related to stock option exercises	1,776			1,949
Other expense (income)	465			(2,577		)
Write-off deferred financing costs and debt premium	5,341			—
Environmental expenditures	(7,833		)	(8,551		)
Changes in assets and liabilities, net of acquisitions
Accounts receivable	59,881			(32,670		)
Other current assets	5,130			(14,113		)
Accounts payable	(18,969		)	30,241
Other current and long-term liabilities	(6,486		)	(8,762		)
Net cash from operating activities	232,692			151,336
Cash flows from investing activities:
Additions to property, plant and equipment	(130,326		)	(113,644		)
Proceeds from sales of fixed assets	4,190			5,925
Acquisitions, net of cash acquired	(92,475		)	(336,960		)
Additions to intangible assets, including costs to obtain or renew permits	(2,409		)	(2,356		)
Purchase of marketable securities	(10,517		)	—
Proceeds from sales of marketable securities	—			425
Other	5,120			—
Proceeds from sale of long-term investments	—			1,000
Net cash used in investing activities	(226,417		)	(445,610		)
Cash flows from financing activities:
Change in uncashed checks	(13,955		)	(2,580		)
Proceeds from exercise of stock options	231			1,089
Remittance of shares, net	(1,604		)	(1,897		)
Proceeds from employee stock purchase plan	4,627			2,451
Deferred financing costs paid	(9,638		)	(8,442		)
Payments on capital leases	(5,303		)	(5,775		)
Principal payment on debt	(520,000		)	—
Distribution of cash earned on employee participation plan	(55		)	(189		)
Excess tax benefit of stock-based compensation	1,786			1,949
Issuance of senior unsecured notes, at par	800,000			—
Issuance of senior secured notes, including premium	—			261,250
Net cash from financing activities	256,089			247,856
Effect of exchange rate change on cash	527			1,367
Increase (decrease) in cash and cash equivalents	262,891			(45,051		)
Cash and cash equivalents, beginning of period	260,723			302,210
Cash and cash equivalents, end of period	$	523,614		$	257,159
Supplemental information:
Cash payments for interest and income taxes:
Interest paid	$	41,176		$	30,169
Income taxes paid	5,578			35,085
Non-cash investing and financing activities:
Property, plant and equipment accrued	$	31,978		$	20,288

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					Additional Paid-in Capital					Accumulated Earnings		Total Stockholders’ Equity
Balance at January 1, 2012	53,183		$	532	$	(469	)	$	497,919		$	31,353	$	371,652	$	900,987
Net income	—		—		—			—			—		67,800		67,800
Other comprehensive income	—		—		—			—			27,703		—		27,703
Stock-based compensation	91		—		—			5,235			—		—		5,235
Issuance of restricted shares, net of shares remitted	(24	)	—		—			(1,604		)	—		—		(1,604		)
Exercise of stock options	39		2		—			229			—		—		231
Net tax benefit on exercise of stock options	97		—		—			1,776			—		—		1,776
Employee stock purchase plan	—		—		—			4,627			—		—		4,627
Balance at September 30, 2012	53,386		$	534	$	(469	)	$	508,182		$	59,056	$	439,452	$	1,006,755

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

6

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 16, 2012.

During the three months ended March 31, 2012, the Company re-assigned certain departments among its segments to support management reporting changes. Accordingly, the Company re-allocated shared departmental costs among its segments. The Company has recast the prior year segment information to conform to the current year presentation. See Note 14, “Segment Reporting.”

(2) RECENT ACCOUNTING PRONOUNCEMENTS

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 required a change in the presentation of the financial statements and required retrospective application. In December 2011, the FASB deferred certain provisions of the ASU that relate to presentation of reclassification adjustments. The Company retrospectively adopted this guidance utilizing two separate but consecutive statements to report the components of other comprehensive income, and recast the financial statements for the years ending 2011, 2010 and 2009 in the Company's Current Report on Form 8-K filed on July 16, 2012. This standard had no impact on the Company's financial position, results of operations or cash flows.

(3) BUSINESS COMBINATIONS

Acquisitions during 2012

The Company acquired during the second quarter of 2012 all of the outstanding stock of a privately owned Canadian company which provides workforce accommodations, camp catering and fresh food services and during the third quarter of 2012 certain assets of a privately owned U.S. company that is engaged in the business of materials handling services that includes a variety of support equipment to provide customers with a sole source for any dredging and dewatering project. The combined purchase price for these acquisitions were approximately $83.7 million, including the assumption and payment of debt of $7.7 million, and post-closing adjustments of $3.9 million based upon the assumed target amounts of working capital. 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. 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.

7

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 dates. Final determination of the fair value may result in further adjustments to the values presented below (in thousands).

	At Acquisition Dates (As reported at September 30, 2012)
Current assets (i)	$13,964
Property, plant and equipment	35,882
Customer relationships and other intangibles	17,690
Current liabilities	(4,022	)
Other liabilities	(3,388	)
Total identifiable net assets	60,126
Goodwill (ii)	23,574
Total	$83,700

_______________________

(i) The preliminary fair value of the financial assets acquired includes customer receivables with an aggregate fair value of $7.3 million. Combined gross amounts due were $7.5 million.  

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial Services segment and will not be deductible for tax purposes.

Acquisition related costs included in selling, general and administrative expenses in the Company's consolidated statements of income for the three and nine months ended September 30, 2012 were immaterial.

The following unaudited pro forma combined summary data presents information as if the 2012 acquisitions had been acquired at the beginning of 2011 and assumes that there were no material, non-recurring pro forma adjustments 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 two acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012	September 30, 2011	September 30, 2012	September 30, 2011
Pro forma combined revenues	$534,770	$568,427	$1,666,377	$1,477,304
Pro forma combined net income	$12,465	$38,616	$73,799	$93,524

Acquisitions during the third quarter of 2011

During the three months 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 $142.1 million, including the assumption and payment of debt of $25.2 million, and post-closing adjustments of $4.5 million based upon the assumed target amounts of working capital.     

During the three months ended September 30, 2012, the Company finalized the purchase accounting of the identified acquired assets and liabilities, including the completion of the intangible assets, current liabilities and remedial liability valuations. The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands).

8

	At Acquisition Dates (As reported at June 30, 2012)			Measurement Period Adjustments			At Acquisition Dates (As Adjusted)
Current assets (i)	$	41,491		$	60		$	41,551
Property, plant and equipment	62,969			—			62,969
Customer relationships and other intangibles	23,371			—			23,371
Other assets	1,671			—			1,671
Current liabilities	(23,403		)	255			(23,148		)
Asset retirement obligations and remedial liabilities	(200		)	—			(200		)
Other liabilities	(2,419		)	—			(2,419		)
Total identifiable net assets	103,480			315			103,795
Goodwill (ii)	38,654			(315		)	38,339
Total	$	142,134		$	—		$	142,134

_______________________

(i) The fair value of the financial assets acquired includes customer receivables with an 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 $13.3 million, $11.1 million and $13.9 million has been assigned to the Oil and Gas Field Services segment, the Technical Services segment, and the Industrial Services segment, respectively, and will not be deductible for tax purposes.

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 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 June 30, 2012, the Company finalized the purchase accounting for the acquisition of Peak. The following table summarizes the amounts of identifiable assets acquired and liabilities assumed at June 10, 2011 (in thousands).

	At June 10, 2011 (As adjusted)
Current assets (i)	$	45,222
Property, plant and equipment	151,574
Identifiable intangible assets	12,337
Other assets	8,009
Current liabilities	(28,785		)
Asset retirement obligations	(103		)
Other liabilities	(11,341		)
Total identifiable net assets	176,913
Goodwill (ii)	28,220
Total	$	205,133

_______________________

(i) The fair value of the financial assets acquired includes customer receivables with a 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 $12.9 million and $15.3 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectively.

9

(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, trade payables and accrued liabilities approximate their carrying value due to the short maturity of these instruments. The carrying value of the cash equivalents and accrued liabilities is Level 2 in the fair value hierarchy. The fair value of the Company’s senior notes at September 30, 2012 was $820.9 million is based on available market data and at December 31, 2011 was $538.5 million is based on quoted market prices. The senior unsecured notes fair value is Level 2 in the fair value hierarchy.

As of September 30, 2012 and December 31, 2011, the Company's assets measured at fair value on a recurring basis were as follows (in thousands):

September 30, 2012
	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, 2012
Auction rate securities	$	—	$	—	$	4,326	$	4,326
Marketable securities	$	11,113	$	—	$	—	$	11,113

December 31, 2011
	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, 2011
Auction rate securities	$	—	$	—	$	4,245	$	4,245
Marketable securities	$	111	$	—	$	—	$	111

The fair value of marketable securities is recorded based on quoted market prices and changes in fair value were included in accumulated other comprehensive income. During the nine months ended September 30, 2012 and 2011, the Company recorded an unrealized pre-tax gain of $0.1 million and an unrealized pre-tax loss of $0.2 million, respectively, on its auction rate securities, which was included in accumulated other comprehensive income.  

The auction rate securities are classified as available for sale and the fair value of these securities as of September 30, 2012 was estimated utilizing a probability discounted cash flow analysis. As of September 30, 2012, all of the Company's auction rate securities continue to have AAA underlying ratings. The Company attributes the $0.4 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.

The following table presents 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, 2012 and 2011 (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2012		2011			2012		2011
Balance at beginning of period	$	4,326	$	5,311		$	4,245	$	5,437
Sale of auction rate securities	—		(1,000		)	—		(1,000		)
Unrealized gains (losses) included in other comprehensive income	—		(72		)	81		(198		)
Balance at September 30,	$	4,326	$	4,239		$	4,326	$	4,239

10

(5) GOODWILL AND OTHER INTANGIBLE ASSETS

The changes to goodwill for the nine months ended September 30, 2012 were as follows (in thousands):

	2012
Balance at January 1, 2012	$	122,392
Acquired from acquisitions	27,449
Increase from adjustments related to the acquisitions during the measurement period	5,037
Currency translation	2,846
Balance at September 30, 2012	$	157,724

The Company evaluates goodwill for impairment on an annual basis at the reporting unit level on the last day of each fiscal year and more frequently if events occur or circumstances change which suggests that the goodwill should be evaluated. The Company performed its annual impairment tests using an income approach. As of September 30, 2012, the Company assessed the performance of its Oil and Gas Field Services reporting unit due to its lower than anticipated financial results and concluded the fair value of the reporting unit more likely than not exceeds the carrying value. The Company will continue to assess this reporting unit's performance.

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

	September 30, 2012							December 31, 2011
	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)
Permits	$	114,910	$	48,907	$	66,003	17.8	$	106,939	$	45,629	$	61,310	17.9
Customer relationships	98,613		25,113		73,500		7.0	83,721		17,650		66,071		7.9
Other intangible assets	23,764		11,457		12,307		3.5	21,528		9,265		12,263		5.3
	$	237,287	$	85,477	$	151,810	8.9	$	212,188	$	72,544	$	139,644	10.0

The aggregate amortization expense for the three and nine months ended September 30, 2012 was $4.4 million and $11.8 million, respectively. The aggregate amortization expense for the three and nine months ended September 30, 2011 was $3.2 million and $8.7 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 for the recent acquisitions assigned to customer relationships and other intangible assets are $12.8 million and $0.6 million, respectively, and the weighted amortization period for customer relationships and other intangible assets are 7.6 years and 2.8 years, respectively.

Below is the expected future amortization for the net carrying amount of finite lived intangible assets at September 30, 2012 (in thousands):

Years Ending December 31,	Expected Amortization
2012 (three months)	$	4,146
2013	15,485
2014	15,007
2015	14,150
2016	13,478
Thereafter	83,749
	$	146,015

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(6) ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	September 30, 2012		December 31, 2011
Insurance	$	22,602	$	21,712
Interest	7,605		15,434
Accrued disposal costs	1,796		2,455
Accrued compensation and benefits	41,885		56,029
Income, real estate, sales and other taxes	24,568		14,863
Other	38,231		37,499
	$	136,687	$	147,992

(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, 2012 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2012	$	25,764		$	9,117		$	34,881
New asset retirement obligations	2,292			—			2,292
Accretion	2,145			810			2,955
Changes in estimates recorded to statement of income	490			446			936
Other changes in estimates recorded to balance sheet	(2,058		)	15			(2,043		)
Expenditures	(1,995		)	(565		)	(2,560		)
Currency translation and other	120			52			172
Balance at September 30, 2012	$	26,758		$	9,875		$	36,633

All of the landfill facilities included in the above were active as of September 30, 2012. New asset retirement obligations incurred in the period January through July 2012 were discounted at the credit-adjusted risk-free rate of 8.56%. Subsequent to the Company's $800.0 million senior unsecured notes offering which was completed on July 30, 2012, the Company recalculated its credit-adjusted risk-free rate. Beginning in August 2012, new asset retirement obligations will be discounted at the rate of 6.66%. The Company has used a consistent inflation rate of 1.02% throughout the 2012 year.

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(8) REMEDIAL LIABILITIES

The changes to remedial liabilities for the nine months ended September 30, 2012 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, 2012	$	5,600		$	78,449		$	51,271		$	135,320
Accretion	206			2,585			1,663			4,454
Changes in estimates recorded to statement of income	(50		)	(846		)	(3,593		)	(4,489		)
Expenditures	(65		)	(3,488		)	(1,720		)	(5,273		)
Currency translation and other	99			4			497			600
Balance at September 30, 2012	$	5,790		$	76,704		$	48,118		$	130,612

(9) FINANCING ARRANGEMENTS

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

	September 30, 2012		December 31, 2011
Senior secured notes, at 7.625%, due August 15, 2016	$	—	$	520,000
Senior unsecured notes, at 5.25%, due August 1, 2020	800,000		—
Revolving credit facility, due May 31, 2016	—		—
Unamortized notes premium and discount, net	—		4,203
Long-term obligations	$	800,000	$	524,203

At September 30, 2012, the revolving credit facility had no outstanding loans, $163.4 million available to borrow and $86.6 million of letters of credit outstanding. There have been no changes to the revolving credit facility since December 31, 2011.

On July 13, 2012, the Company redeemed $30.0 million principal amount of the $520.0 million aggregate principal amount of the Company's 7.625% senior secured notes (“2016 Notes”) in accordance with the terms of the 2016 Notes. On July 16, 2012, the Company commenced a tender offer to purchase any and all of the $490.0 million aggregate principal amount of the then outstanding 2016 Notes following such partial redemption. On July 30, 2012, the Company purchased the $339.1 million principal amount of the 2016 Notes which had been tendered by July 27, 2012, and called for redemption on August 15, 2012 the $150.9 million principal amount of the 2016 Notes which had not been tendered. The Company financed that purchase and call for redemption of the 2016 Notes through a private placement of $800.0 million aggregate principal amount of 5.25% senior unsecured notes due 2020 (“New Notes”) which the Company also completed on July 30, 2012. The Company intends to use the $262.8 million of remaining net proceeds from such private placement of the New Notes to finance potential future acquisitions and for general corporate purposes. The Company is conducting an exchange offer for the unregistered New Notes originally issued for New Notes the Company registered under the Securities Act of 1933, as amended, pursuant to a registration statement which became effective in October 2012.

In connection with the tender offer and redemption of the 2016 Notes described above, the Company recorded an aggregate $26.4 million loss on early extinguishment of debt, which consisted of $21.1 million of purchase, consent and redemption fees and non-cash expenses of $5.3 million, of which $8.8 million related to unamortized financing costs offset partially by $3.5 million of unamortized net premium.

The principal terms of the New Notes are as follows:

The New Notes mature on August 1, 2020 and bear interest at a rate of 5.25% per annum, computed on the basis of a 360-day year composed of twelve 30-day months and payable semi-annually on August 1 and February 1 of each year, commencing on February 1, 2013.  The Company may redeem some or all of the New Notes at any time on or after August 1, 2016 upon not less than 30 nor more than 60 days' notice, at the following redemption prices (expressed as percentages of the

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principal amount) if redeemed during the twelve-month period commencing on August 1 of the year set forth below, plus, in each case, accrued and unpaid interest, if any, to the date of redemption: 

Year	Percentage
2016	102.625	%
2017	101.313	%
2018 and thereafter	100.000	%

At any time prior to August 1, 2015, the Company may also redeem up to 35% of the aggregate principal amount of all New Notes issued under the indenture (whether on July 30, 2012 or thereafter pursuant to an issuance of additional New Notes under the indenture) at a redemption price of 105.250% 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 New 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 New 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 New Notes and the related indenture contain various customary covenants and are guaranteed by substantially all the Company's current and future domestic restricted subsidiaries. The New Notes are the Company's and the guarantors' senior unsecured obligations ranking equally with the Company's and the guarantors' existing and future senior unsecured obligations and senior to any future indebtedness that is expressly subordinated to the New Notes and the guarantees. The New Notes and the guarantees rank effectively junior in right of payment to the Company's and the guarantors' secured indebtedness (including loans and reimbursement obligations in respect of outstanding letters of credit) under the Company's revolving credit facility and capital lease obligations to the extent of the value of the assets securing such secured indebtedness. The New Notes are not guaranteed by the Company's Canadian or other foreign subsidiaries, and the new notes will be structurally subordinated to all indebtedness and other liabilities, including trade payables, of the Company's subsidiaries that are not guarantors of the New Notes.

The financing arrangements and principal terms of the 2016 Notes and the revolving credit facility are discussed further in the Company’s Current Report on Form 8-K dated July 16, 2012.

(10) INCOME TAXES

The Company’s effective tax rate for the three and nine months ended September 30, 2012 was 33.8% and 35.6%, respectively, compared to 33.7% and 34.7% for the same period in 2011.

As of September 30, 2012, the Company had recorded $36.2 million of liabilities for unrecognized tax benefits and $28.8 million of interest and penalties. As of December 31, 2011, the Company had recorded $36.2 million of liabilities for unrecognized tax benefits and $26.8 million of interest and penalties.

The Company believes that it is reasonably possible that total unrecognized tax benefits and related reserves will decrease by approximately $63.8 million within the next twelve months as a result of the lapse of the statute of limitations. The $63.8 million (which includes interest and penalties of $28.6 million) is primarily related to a historical Canadian debt restructuring transaction and, if realized, will be recorded in earnings and therefore will impact the effective income tax rate.

(11) EARNINGS PER SHARE

The Company computed basic earnings per share, or EPS, for the three and nine months ended September 30, 2012 using the weighted average number of shares outstanding during the periods. For the three and nine months ended September 30, 2012, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations below except for 66,000 outstanding performance stock awards for which the performance criteria were not attained at that time. For the three and nine months ended September 30, 2011, the EPS calculations below include the dilutive effects of all then outstanding options, restricted stock, and performance awards except for 73,000 outstanding performance stock awards for which the performance criteria were not attained at that time.

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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,
	2012		2011		2012		2011
Numerator for basic and diluted earnings per share:
Net Income	$	12,359	$	37,133	$	67,800	$	89,019
Denominator:
Basic shares outstanding	53,374		53,023		53,303		52,921
Dilutive effect of equity-based compensation awards	191		347		216		377
Dilutive shares outstanding	53,565		53,370		53,519		53,298
Basic earnings per share:	$	0.23	$	0.70	$	1.27	$	1.68
Diluted earnings per share:	$	0.23	$	0.70	$	1.27	$	1.67

(12) STOCK-BASED COMPENSATION

The following table summarizes the total number and type of awards granted during the three and nine months ended September 30, 2012, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2012			September 30, 2012
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	33,494	$	53.41	108,761	$	60.49
Performance stock awards	1,392	$	53.41	70,511	$	66.98
Total awards	34,886			179,272

Certain performance stock awards granted in March 2012, June 2012 and September 2012 are subject to achieving three performance goals including predetermined revenue, EBITDA and total reportable incident rate targets for a specified period of time as well as service conditions.  As of September 30, 2012, based on year-to-date results of operations, management has not determined that it is probable that the performance targets for the 2012 performance awards will be achieved by December 31, 2013. As a result, the Company recognized no expense during the three and nine months ended September 30, 2012 related to the 2012 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, 2012 and December 31, 2011, the Company had recorded reserves of $30.2 million and $30.3 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, 2012 and December 31, 2011, the Company also believed that it was reasonably possible that the amount of these potential liabilities could

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be as much as $2.7 million more. 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, 2012, the $30.2 million of reserves consisted of (i) $27.4 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets and (ii) $2.8 million primarily related to federal and state enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of September 30, 2012, the principal legal and administrative proceedings in which the Company was involved 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. In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec claiming a 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 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, 2012 and December 31, 2011, the Company had accrued $14.2 million and $13.3 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings.

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. On December 16, 2011, the parties to the lawsuits described above reached an Agreement in Principle (“AIP”) to resolve all outstanding disputes. The AIP required additional approvals by County and State authorities before a final settlement and dismissal of the lawsuits can be finalized, and the approvals were obtained in November 2012.

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 68 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 68 sites, two involve facilities that are now owned by the Company and 66 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 66 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, seven are currently requiring expenditures on remediation, 13 are now settled, and 15 are not currently requiring expenditures on remediation. The status of one of the facilities now owned by the Company

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(the BR Facility) and one of the Listed Third Party Sites (the Casmalia site) 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.

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.  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, 2012 and December 31, 2011, the amount of the Company’s reserves relating to the Marine Shale site was $4 million and $3.8 million, respectively.

Certain Other Third Party Sites.  At 15 of the 66 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 15 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 15 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 66 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.

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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, 2012 and December 31, 2011, there were three and four proceedings, respectively, for which the Company reasonably believed that the sanctions could equal or exceed $100,000. The Company believes that the fines or other penalties in these or any of the other regulatory proceedings, individually or in the aggregate, will not have a material adverse effect on its financial condition, results of operations or cash flows.

Other Contingencies

In December 2010, the Company paid $10.5 million to acquire a minority interest in Safety-Kleen, Inc. ("Safety-Kleen"). Subsequent to the purchase of those securities but prior to December 31, 2010, Safety-Kleen 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 attributable to the minority interest by the privately-held company and 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. Subsequent to September 30, 2012, the Company has stayed the litigation pending the completion of the Company's proposed acquisition of Safety-Kleen.

(14) SEGMENT REPORTING

During the quarter ended March 31, 2012, the Company re-assigned certain departments among its segments to support management reporting changes. Accordingly, the Company re-allocated shared departmental costs among its segments. The Company has recast the prior year segment information to conform to the current year presentation.

The Company’s operations are managed in four reportable segments: Technical Services, Field Services, Industrial Services and Oil and Gas Field Services. 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 is other expense (income) and loss on early extinguishment of debt 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 months ended September 30, 2012 and 2011 (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, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	236,605	$	60,194		$	149,120		$	87,619	$	268		$	533,806
Intersegment revenues, net	5,501		(2,531		)	(4,599		)	2,296		(667		)	—
Direct revenues	$	242,106	$	57,663		$	144,521		$	89,915	$	(399	)	$	533,806

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	For the Three Months Ended September 30, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	221,424	$	105,181		$	123,639		$	105,546		$	263		$	556,053
Intersegment revenues, net	6,934		(5,661		)	(171		)	(532		)	(570		)	—
Direct revenues	$	228,358	$	99,520		$	123,468		$	105,014		$	(307	)	$	556,053

	For the Nine Months Ended September 30, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	676,074	$	174,557		$	458,858		$	318,158	$	1,299		$	1,628,946
Intersegment revenues, net	22,779		(10,309		)	(19,970		)	8,962		(1,462		)	—
Direct revenues	$	698,853	$	164,248		$	438,888		$	327,120	$	(163	)	$	1,628,946

	For the Nine Months Ended September 30, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	633,187	$	216,377		$	351,534		$	236,553	$	599		$	1,438,250
Intersegment revenues, net	17,181		(13,279		)	(7,217		)	4,859		(1,544		)	—
Direct revenues	$	650,368	$	203,098		$	344,317		$	241,412	$	(945	)	$	1,438,250

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, other expense (income), and loss on early extinguishment of debt to its segments.

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Adjusted EBITDA:
Technical Services	$	67,332		$	62,531		$	184,874		$	174,033
Field Services	5,707			19,318			15,599			31,527
Industrial Services	37,860			25,933			107,452			77,630
Oil and Gas Field Services	14,752			25,062			60,961			45,748
Corporate Items	(25,124		)	(29,013		)	(78,710		)	(76,289		)
Total	$	100,527		$	103,831		$	290,176		$	252,649
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	$	2,488		$	2,435		$	7,409		$	7,231
Depreciation and amortization	41,300			34,604			116,794			87,000
Income from operations	56,739			66,792			165,973			158,418
Other expense (income)	91			(164		)	465			(5,931		)
Loss on early extinguishment of debt	26,385			—			26,385			—
Interest expense, net of interest income	11,596			10,927			33,836			28,047
Income before provision for income taxes	$	18,667		$	56,029		$	105,287		$	136,302

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

	September 30, 2012		December 31, 2011
Property, plant and equipment, net
Technical Services	$	323,159	$	308,118
Field Services	35,323		30,296
Industrial Services	301,748		254,469
Oil and Gas Field Services	278,245		267,987
Corporate Items	64,939		43,077
Total property, plant and equipment, net	$	1,003,414	$	903,947
Intangible assets:
Technical Services
Goodwill	$	45,473	$	44,410
Permits and other intangibles, net	79,615		81,605
Total Technical Services	125,088		126,015
Field Services
Goodwill	2,232		2,232
Permits and other intangibles, net	3,140		1,204
Total Field Services	5,372		3,436
Industrial Services
Goodwill	69,870		45,444
Permits and other intangibles, net	34,537		19,701
Total Industrial Services	104,407		65,145
Oil and Gas Field Services
Goodwill	40,149		30,306
Permits and other intangibles, net	34,518		37,134
Total Oil and Gas Field Services	74,667		67,440
Total	$	309,534	$	262,036

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

	September 30, 2012		December 31, 2011
Technical Services	$	619,868	$	604,904
Field Services	47,001		37,850
Industrial Services	445,048		345,202
Oil and Gas Field Services	377,938		429,938
Corporate Items	959,548		667,909
Total	$	2,449,403	$	2,085,803

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

	September 30, 2012		December 31, 2011
United States	$	1,427,861	$	1,119,491
Canada	1,021,542		961,936
Other foreign	—		4,376
Total	$	2,449,403	$	2,085,803

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(15) GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

The New Notes are and the 2016 Notes were guaranteed by substantially all of the Company's subsidiaries organized in the United States. Each guarantor for the New Notes and the 2016 Notes is a wholly-owned subsidiary of the Company and its guarantee is both full and unconditional and joint and several.  The New Notes are and the 2016 Notes were 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, 2012 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	327,020	$	114,602	$	81,992	$	—		$	523,614
Intercompany receivables	328,608		—		115,876		(444,484		)	—
Other current assets	26,065		342,516		217,093		—			585,674
Property, plant and equipment, net	—		449,338		554,076		—			1,003,414
Investments in subsidiaries	1,218,442		502,375		91,751		(1,812,568		)	—
Intercompany debt receivable	—		485,539		3,701		(489,240		)	—
Other long-term assets	12,735		141,232		182,734		—			336,701
Total assets	$	1,912,870	$	2,035,602	$	1,247,223	$	(2,746,292	)	$	2,449,403
Liabilities and Stockholders’ Equity:
Current liabilities	$	11,976	$	234,742	$	118,845	$	—		$	365,563
Intercompany payables	—		444,484		—		(444,484		)	—
Closure, post-closure and remedial liabilities, net	—		124,481		23,212		—			147,693
Long-term obligations	800,000		—		—		—			800,000
Capital lease obligations, net	—		289		3,188		—			3,477
Intercompany debt payable	3,701		—		485,539		(489,240		)	—
Other long-term liabilities	90,438		7,798		27,679		—			125,915
Total liabilities	906,115		811,794		658,463		(933,724		)	1,442,648
Stockholders’ equity	1,006,755		1,223,808		588,760		(1,812,568		)	1,006,755
Total liabilities and stockholders’ equity	$	1,912,870	$	2,035,602	$	1,247,223	$	(2,746,292	)	$	2,449,403

21

Following is the condensed consolidating balance sheet at December 31, 2011 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	91,581	$	128,071	$	41,071	$	—		$	260,723
Intercompany receivables	319,444		—		126,823		(446,267		)	—
Other current assets	43,687		324,607		262,851		—			631,145
Property, plant and equipment, net	—		392,566		511,381		—			903,947
Investments in subsidiaries	1,064,966		421,648		91,654		(1,578,268		)	—
Intercompany debt receivable	—		472,929		3,701		(476,630		)	—
Other long-term assets	13,228		111,104		165,656		—			289,988
Total assets	$	1,532,906	$	1,850,925	$	1,203,137	$	(2,501,165	)	$	2,085,803
Liabilities and Stockholders’ Equity:
Current liabilities	$	15,612	$	220,968	$	145,162	$	—		$	381,742
Intercompany payables	—		446,267		—		(446,267		)	—
Closure, post-closure and remedial liabilities, net	—		133,773		21,369		—			155,142
Long-term obligations	524,203		—		—		—			524,203
Capital lease obligations, net	—		475		5,900		—			6,375
Intercompany debt payable	3,701		—		472,929		(476,630		)	—
Other long-term liabilities	88,403		7,588		21,363		—			117,354
Total liabilities	631,919		809,071		666,723		(922,897		)	1,184,816
Stockholders’ equity	900,987		1,041,854		536,414		(1,578,268		)	900,987
Total liabilities and stockholders’ equity	$	1,532,906	$	1,850,925	$	1,203,137	$	(2,501,165	)	$	2,085,803

22

Following is the consolidating statement of income (loss) for the three months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	314,822		$	223,982		$	(4,998	)	$	533,806
Cost of revenues (exclusive of items shown separately below)	—			218,697			159,241			(4,998		)	372,940
Selling, general and administrative expenses	9			35,810			24,520			—			60,339
Accretion of environmental liabilities	—			2,150			338			—			2,488
Depreciation and amortization	—			20,778			20,522			—			41,300
Income from operations	(9		)	37,387			19,361			—			56,739
Other expense	—			(8		)	(83		)	—			(91		)
Loss on early extinguishment of debt	(26,385		)	—			—						(26,385		)
Interest (expense) income	(11,247		)	180			(529		)	—			(11,596		)
Equity in earnings of subsidiaries	50,039			15,869			—			(65,908		)	—
Intercompany dividend income (expense)	—			—			3,439			(3,439		)	—
Intercompany interest income (expense)	—			10,290			(10,290		)	—			—
Income before provision for income taxes	12,398			63,718			11,898			(69,347		)	18,667
Provision for income taxes	39			3,831			2,438			—			6,308
Net income	12,359			59,887			9,460			(69,347		)	12,359
Other comprehensive income (loss)	29,980			29,980			13,042			(43,022		)	29,980
Comprehensive income (loss)	$	42,339		$	89,867		$	22,502		$	(112,369	)	$	42,339

Following is the consolidating statement of income (loss) 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	(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 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	37,133			56,756			17,691			(74,447		)	37,133
Other comprehensive (loss) income	(58,144		)	(58,144		)	(20,839		)	78,983			(58,144		)
Comprehensive (loss) income	$	(21,011	)	$	(1,388	)	$	(3,148	)	$	4,536		$	(21,011	)

23

Following is the consolidating statement of income for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	920,101		$	724,532		$	(15,687	)	$	1,628,946
Cost of revenues (exclusive of items shown separately below)	—			630,652			525,913			(15,687		)	1,140,878
Selling, general and administrative expenses	27			122,167			75,698			—			197,892
Accretion of environmental liabilities	—			6,430			979			—			7,409
Depreciation and amortization	—			56,568			60,226			—			116,794
Income from operations	(27		)	104,284			61,716			—			165,973
Other expense	—			(333		)	(132		)	—			(465		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest (expense) income	(32,679		)	—			(1,157		)	—			(33,836		)
Equity in earnings of subsidiaries	124,965			49,236			—			(174,201		)	—
Intercompany dividend income (expense)	10,010			—			10,354			(20,364		)	—
Intercompany interest income (expense)	—			30,894			(30,894		)	—			—
Income before provision for income taxes	75,884			184,081			39,887			(194,565		)	105,287
Provision for income taxes	8,084			19,473			9,930			—			37,487
Net income	67,800			164,608			29,957			(194,565		)	67,800
Other comprehensive income (loss)	27,703			27,703			11,370			(39,073		)	27,703
Comprehensive income (loss)	$	95,503		$	192,311		$	41,327		$	(233,638	)	$	95,503

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 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
Other comprehensive (loss) income	(38,537		)	(38,537		)	(15,044		)	53,581			(38,537		)
Comprehensive income (loss)	$	50,482		$	111,824		$	24,612		$	(136,436	)	$	50,482

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Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(49,918	)	$	98,497		$	184,113		$	232,692
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,664		)	(54,662		)	(130,326		)
Proceeds from sales of fixed assets	—			3,411			779			4,190
Acquisitions, net of cash acquired	—			(51,424		)	(41,051		)	(92,475		)
Costs to obtain or renew permits	—			(625		)	(1,784		)	(2,409		)
Purchase of marketable securities	—			—			(10,517		)	(10,517		)
Other	—			603			4,517			5,120
Net cash from investing activities	—			(123,699		)	(102,718		)	(226,417		)
Cash flows from financing activities:
Change in uncashed checks	—			(7,771		)	(6,184		)	(13,955		)
Proceeds from exercise of stock options	231			—			—			231
Proceeds from employee stock purchase plan	4,627			—			—			4,627
Remittance of shares, net	(1,604		)	—			—			(1,604		)
Excess tax benefit of stock-based compensation	1,786			—			—			1,786
Deferred financing costs paid	(9,638		)	—			—			(9,638		)
Payments on capital leases	—			(781		)	(4,522		)	(5,303		)
Principal payment on debt	(520,000		)	—			—			(520,000		)
Issuance of senior unsecured notes	800,000			—			—			800,000
Distribution of cash earned on employee participation plan	(55		)	—			—			(55		)
Dividends (paid) / received	10,010			(23,669		)	13,659			—
Interest (payments) / received	—			43,954			(43,954		)	—
Net cash from financing activities	285,357			11,733			(41,001		)	256,089
Effect of exchange rate change on cash	—			—			527			527
Increase in cash and cash equivalents	235,439			(13,469		)	40,921			262,891
Cash and cash equivalents, beginning of period	91,581			128,071			41,071			260,723
Cash and cash equivalents, end of period	$	327,020		$	114,602		$	81,992		$	523,614

25

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		)
Proceeds from sale of fixed assets	—			545			5,380			5,925
Acquisitions, net of cash acquired	—			(50,166		)	(286,794		)	(336,960		)
Costs to obtain or renew permits	—			(486		)	(1,870		)	(2,356		)
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 of 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
Increase (decrease) 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

(16) SUBSEQUENT EVENT

On October 26, 2012, the Company signed an agreement and plan of merger (the "Merger Agreement") which provides that, subject to the terms and conditions contained in the Merger Agreement, the Company will acquire 100% jof Safety-Kleen, a Delaware corporation headquartered in Richardson, Texas. Safety-Kleen is the largest re-refiner and recycler of used oil in North America and a leading provider of parts cleaning and environmental services. Safety-Kleen services commercial and industrial customers in the U.S., Canada and Puerto Rico. The proposed addition of Safety-Kleen aligns with the Company's acquisition strategy of increasing density in its existing markets and establishing leadership positions in new markets.

Under the terms of the Merger Agreement, the Company will pay to Safety-Kleen shareholders cash consideration in an amount equal to $1.25 billion plus the amount of cash and cash equivalents held by Safety-Kleen on the closing date less the amount of debt held by Safety-Kleen on the closing date, plus or minus, as applicable, the amount by which Safety-Kleen's working capital (excluding cash) on the closing date exceeds or is less than $50 million.

26

The Merger Agreement is not subject to a financing contingency. The Company has received a backup financing commitment from Goldman Sachs Bank USA, but is considering other financing options, which may include a combination of existing cash, debt and equity. The acquisition is subject to approval by regulators and the Safety-Kleen shareholders, as well as other customary closing conditions, and is expected to be completed by the end of 2012. The Merger Agreement is subject to termination by either the Company or Safety-Kleen under certain circumstances.

27

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 on 10-Q 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 February 29, 2012, 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 60,000 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 200 locations, including over 50 waste management facilities, throughout North America in 38 U.S. states, seven Canadian provinces, Mexico and Puerto Rico. 

During the three months ended March 31, 2012, we re-assigned certain departments among the segments to support management reporting changes. Accordingly, we re-allocated shared departmental costs among our segments. We have recast the prior year segment information to conform to the current year presentation.

We report our business in four operating segments, consisting 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, 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.

Acquisitions

The Company acquired during the second quarter of 2012 all of the outstanding stock of a privately owned Canadian company which provides workforce accommodations, camp catering and fresh food services to the remote industries of natural resources and during the third quarter of 2012 certain assets of a privately owned U.S. company that is engaged in the business of materials handling services that includes a variety of support equipment to provide customers with a sole source for any dredging and dewatering project. The combined purchase price for these acquisitions were approximately $83.7 million, including the assumption and payment of debt of $7.7 million, and post-closing adjustments of $3.9 million based upon the assumed target amounts of working capital.

Additionally, on October 26, 2012, the Company signed the Merger Agreement which provides that, subject to the terms and conditions contained in the Merger Agreement, the Company will acquire 100% of Safety-Kleen, Inc. ("Safety-Kleen"), a

28

Delaware corporation headquartered in Richardson, Texas. Safety-Kleen is the largest re-refiner and recycler of used oil in North America and a leading provider of parts cleaning and environmental services. Safety-Kleen services commercial and industrial customers in the U.S., Canada and Puerto Rico. The proposed addition of Safety-Kleen aligns with the Company's acquisition strategy of increasing density in its existing markets and establishing leadership positions in new markets.

Under the terms of the Merger Agreement, the Company will pay to Safety-Kleen shareholders cash consideration in an amount equal to $1.25 billion plus the amount of cash and cash equivalents held by Safety-Kleen on the closing date less the amount of debt held by Safety-Kleen on the closing date, plus or minus, as applicable, the amount by which Safety-Kleen's working capital (excluding cash) on the closing date exceeds or is less than $50 million.

The Merger Agreement is not subject to a financing contingency. The Company has received a backup financing commitment from Goldman Sachs Bank USA, but is considering other financing options, which may include a combination of existing cash, debt and equity. The acquisition is subject to approval by regulators and the Safety-Kleen shareholders, as well as other customary closing conditions, and is expected to be completed by the end of 2012. The Merger Agreement is subject to termination by either the Company or Safety-Kleen under certain circumstances.

Summary of Operations

 During the three months ended September 30, 2012, our revenues were $533.8 million, compared with $556.1 million

during the three months ended September 30, 2011. Although our Technical Services and Industrial Services segments

experienced revenue growth during the three months ended September 30, 2012, the year-over-year revenue decrease was driven

primarily due to decreases in the level of emergency response work within our Field Service segment as well as decreases in our

Oil and Gas Field Service segment.

Our Technical Services revenues accounted for 45% of our total revenues for the three months ended September 30, 2012.  The year-over-year increase in revenues of 6% was primarily due to increases in volumes being processed through our incinerators, landfills, treatment, storage and disposal facilities, and waster water treatment plants.  The utilization rate at our incinerators was 91.3% for the three months ended September 30, 2012, compared with 89.0% in the comparable period of 2011, and an increase in our landfill volumes.

Our Field Services revenues accounted for 11% of our total revenues for the three months ended September 30, 2012. The year-over-year decrease in revenue of 42% resulted primarily from a decreased level of emergency response work during the three months ended September 30, 2012. During the three months ended September 30, 2011, Field Services performed emergency response work to the Yellowstone River oil spill in Montana which accounted for $41.5 million of our third party revenues.

Our Industrial Services revenues accounted for 27% of our total revenues for the three months ended September 30, 2012. The year-over-year increase in revenue of 17% was primarily due to an increase in our lodging business, particularly our fixed lodging locations, growth in the oil sands region of Canada an increase in a broad array of our specialty services and a higher level of turnaround work year-over-year.

Our Oil and Gas Field Services revenues accounted for 17% of our total revenues for the three months ended September 30, 2012. The year-over-year decrease of 14% was primarily due to a reduction in fluids handling and surface rental activity, decreased exploration activities and a reduction in the energy services business.

Our cost of revenues decreased from $386.5 million during the three months ended September 30, 2011 to $372.9 million during the three months ended September 30, 2012.  Our cost of revenues decreased primarily due to the lack of emergency response work in 2012.  Our gross profit margin was 30.1% for the three months ended September 30, 2012, compared to 30.5% in the same period last year. The year-over-year decrease in gross margin was primarily due to decreased gross margin in our Oil and Gas Field Services segment.

During the three months ended September 30, 2012, our effective tax rate was 33.8%, compared with 33.7% for the same period last year.

Environmental Liabilities

We have accrued environmental liabilities as of September 30, 2012, of approximately $167.2 million, substantially all of which we assumed as part of acquisitions.  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

29

greater amounts than currently anticipated.

We realized a net benefit in the nine months ended September 30, 2012 of $3.6 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, 2012, a charge of approximately $0.5 million was recorded in cost of revenues and a benefit of approximately $4.1 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,” and Item 8, "Financial Statements and Supplementary Data," of our Annual Report on Form 10-K for the year ended December 31, 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,
	2012		2011		2012		2011
Revenues	100.0	%	100.0	%	100.0	%	100.0	%
Cost of revenues (exclusive of items shown separately below)	69.9		69.5		70.0		70.0
Selling, general and administrative expenses	11.3		11.8		12.1		12.4
Accretion of environmental liabilities	0.5		0.4		0.5		0.5
Depreciation and amortization	7.7		6.2		7.2		6.0
Income from operations	10.6		12.1		10.2		11.1
Other (expense) income	—		—		—		0.4
Loss on early extinguishment of debt	(4.9	)	—		(1.6	)	—
Interest expense, net of interest income	(2.2	)	(2.0	)	(2.1	)	(2.0	)
Income before provision for income taxes	3.5		10.1		6.5		9.5
Provision for income taxes	1.2		3.4		2.3		3.3
Net Income	2.3	%	6.7	%	4.2	%	6.2	%

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 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.

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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,
	2012		2011			2012		2011
Net income	$	12,359	$	37,133		$	67,800	$	89,019
Accretion of environmental liabilities	2,488		2,435			7,409		7,231
Depreciation and amortization	41,300		34,604			116,794		87,000
Other expense (income)	91		(164		)	465		(5,931		)
Loss on early extinguishment of debt	26,385		—			26,385		—
Interest expense, net	11,596		10,927			33,836		28,047
Provision for income taxes	6,308		18,896			37,487		47,283
Adjusted EBITDA	$	100,527	$	103,831		$	290,176	$	252,649

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

	For the Nine Months Ended
	September 30,
	2012			2011
Adjusted EBITDA	$	290,176		$	252,649
Interest expense, net	(33,836		)	(28,047		)
Provision for income taxes	(37,487		)	(47,283		)
Allowance for doubtful accounts	809			623
Amortization of deferred financing costs and debt discount	1,173			1,230
Change in environmental liability estimates	(3,553		)	(2,467		)
Deferred income taxes	(494		)	(197		)
Stock-based compensation	5,235			5,329
Excess tax benefit of stock-based compensation	(1,786		)	(1,949		)
Income tax benefits related to stock option exercises	1,776			1,949
Eminent domain compensation	—			3,354
Prepayment penalty on early extinguishment of debt	(21,044		)	—
Environmental expenditures	(7,833		)	(8,551		)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	59,881			(32,670		)
Other current assets	5,130			(14,113		)
Accounts payable	(18,969		)	30,241
Other current and long-term liabilities	(6,486		)	(8,762		)
Net cash from operating activities	$	232,692		$	151,336

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 months ended September 30, 2012 and 2011 (in thousands). We consider the Adjusted EBITDA contribution from each operating segment to include revenue attributable to each segment less

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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 2012 in how we manage our business. This table and subsequent discussions should be read in conjunction with Item 6, "Selected Financial Data" and Item 8, "Financial Statements and Supplementary Data" included in our Annual Report on Form 10-K for the year ended December 31, 2011, Item 8, "Financial Statements and Supplementary Data" and in particular Note 14, "Segment Reporting," included in our Current Report on Form 8-K filed on July 16, 2012 and Item 1, "Unaudited Financial Statements" and in particular Note 14, "Segment Reporting," in this report.

Three months ended September 30, 2012 versus the three months ended September 30, 2011

	Summary of Operations (in thousands)
	For the Three Months Ended September 30,
	2012			2011			$ Change			% Change
Direct Revenues:
Technical Services	$	242,106		$	228,358		$	13,748		6.0	%
Field Services	57,663			99,520			(41,857		)	(42.1	)
Industrial Services	144,521			123,468			21,053			17.1
Oil and Gas Field Services	89,915			105,014			(15,099		)	(14.4	)
Corporate Items	(399		)	(307		)	(92		)	30.0
Total	533,806			556,053			(22,247		)	(4.0	)
Cost of Revenues (exclusive of items shown separately) (1):
Technical Services	158,508			147,282			11,226			7.6
Field Services	46,158			74,248			(28,090		)	(37.8	)
Industrial Services	98,760			89,410			9,350			10.5
Oil and Gas Field Services	67,888			72,204			(4,316		)	(6.0	)
Corporate Items	1,626			3,374			(1,748		)	(51.8	)
Total	372,940			386,518			(13,578		)	(3.5	)
Selling, General & Administrative Expenses:
Technical Services	16,266			18,545			(2,279		)	(12.3	)
Field Services	5,798			5,954			(156		)	(2.6	)
Industrial Services	7,901			8,125			(224		)	(2.8	)
Oil and Gas Field Services	7,275			7,748			(473		)	(6.1	)
Corporate Items	23,099			25,332			(2,233		)	(8.8	)
Total	60,339			65,704			(5,365		)	(8.2	)
Adjusted EBITDA:
Technical Services	67,332			62,531			4,801			7.7
Field Services	5,707			19,318			(13,611		)	(70.5	)
Industrial Services	37,860			25,933			11,927			46.0
Oil and Gas Field Services	14,752			25,062			(10,310		)	(41.1	)
Corporate Items	(25,124		)	(29,013		)	3,889			(13.4	)
Total	$	100,527		$	103,831		$	(3,304	)	(3.2	)%

_______________________

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

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Revenues

Technical Services revenues increased6.0%, or $13.7 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to increases in volumes being processed through our incinerators, landfills, treatment, storage and disposal facilities, and waste water treatment plants. The utilization rate at our incinerators was 91.3% for the three months ended September 30, 2012, compared with 89.0% in the comparable period of 2011, and our landfill volumes increased due to several large scale projects and Bakken Oil Fields related activity.

Field Services revenues decreased42.1%, or $41.9 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to the decreased level of emergency response work. During the three months ended September 30, 2011, Field Services performed emergency response work to the Yellowstone River oil spill in Montana which accounted for $41.5 million of our third party revenues.

Industrial Services revenues increased17.1%, or $21.1 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to an increase in our lodging business, particularly our fixed lodging locations ($11.9 million), growth in the oil sands region of Canada, an increase in a broad array of our specialty services, and a higher level of turnaround work year-over-year. These increases resulted partially from revenues associated with our acquisitions in 2012 and 2011, including Peak in June 2011.

Oil and Gas Field Services revenues decreased14.4%, or $15.1 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to a reduction in fluids handling and surface rentals activity related to the acquisition of Peak in June 2011 ($7.9 million), decreased exploration activities ($5.9 million), and a reduction in the energy services business ($4.6 million). During the three months ended June 30, 2012, we began repositioning some of our solids control assets and rental equipment as a result of the shift earlier this year by many energy producers away from some dry gas wells toward liquid gas and oil plays.

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, competitive industry pricing, and the effects of fuel prices on our fuel recovery fees.

Cost of Revenues

Technical Services cost of revenues increased7.6%, or $11.2 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to increases in outside transportation ($3.3 million), materials for reclaim ($3.2 million), salary and labor expenses ($2.0 million), outside disposal and rail costs ($1.1 million).

Field Services cost of revenues decreased37.8%, or $28.1 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to decreases in the level of emergency response work including the Yellowstone River oil spill in Montana during the three months ended September 30, 2011 ($28.1 million).

Industrial Services cost of revenues increased10.5%, or $9.4 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to increased salary and labor expenses associated with acquisitions during 2012 and 2011.

Oil and Gas Field Services cost of revenues decreased6.0%, or $4.3 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to costs related to a reduction in fluids handling and surface rentals activity, decreased exploration activities and a reduction in the energy services business.

 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, 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 decreased12.3%, or $2.3 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to decreased incentive compensation and environmental changes in estimate.

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Field Services selling, general and administrative expenses decreased2.6%, or $0.2 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to decreased incentive compensation.

Industrial Services selling, general and administrative expenses decreased2.8%, or $0.2 million, in the three months ended September 30, 2012 from the comparable period in 2011 primarily due to decreased incentive compensation.

Oil and Gas Field Services selling, general and administrative expenses decreased6.1% or $0.5 million for the three months ended September 30, 2012, from the comparable period in 2011. The decreased was primarily due to decreases in incentive compensation.

Corporate Items selling, general and administrative expenses decreased8.8%, or $2.2 million, for the three months ended September 30, 2012, as compared to the same period in 2011 primarily to decreases in incentive compensation ($2.7 million).

Depreciation and Amortization

	Three Months Ended September 30,
	(in thousands)
	2012		2011
Depreciation of fixed assets	$	31,636	$	28,456
Landfill and other amortization	9,664		6,148
Total depreciation and amortization	$	41,300	$	34,604

Depreciation and amortization increased 19.4%, or $6.7 million, in the third quarter of 2012 compared to the same period in 2011. 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 volumes at our landfill facilities and increase in other intangibles resulting from recent acquisitions.

Interest Expense, Net

	Three Months Ended September 30,
	(in thousands)
	2012			2011
Interest expense	$	11,817		$	11,080
Interest income	(221		)	(153		)
Interest expense, net	$	11,596		$	10,927

Interest expense, net increased $0.7 million in the third quarter of 2012 compared to the same period in 2011. The increase in interest expense was primarily due to the issuance of $800.0 million 5.25% senior unsecured notes offset by the redemption and repurchase of $520.0 million 7.625% senior secured notes in July 2012. The result of the transactions resulted in an additional amount of notes at a more favorable coupon rate.

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Nine months ended September 30, 2012 versus the Nine months ended September 30, 2011

	Summary of Operations (in thousands)
	For the Nine Months Ended September 30,
	2012			2011			$ Change			% Change
Direct Revenues:
Technical Services	$	698,853		$	650,368		$	48,485		7.5	%
Field Services	164,248			203,098			(38,850		)	(19.1	)
Industrial Services	438,888			344,317			94,571			27.5
Oil and Gas Field Services	327,120			241,412			85,708			35.5
Corporate Items	(163		)	(945		)	782			(82.8	)
Total	1,628,946			1,438,250			190,696			13.3
Cost of Revenues (exclusive of items shown separately) (1):
Technical Services	457,242			422,435			34,807			8.2
Field Services	128,847			153,638			(24,791		)	(16.1	)
Industrial Services	307,226			243,830			63,396			26.0
Oil and Gas Field Services	240,947			178,194			62,753			35.2
Corporate Items	6,616			8,752			(2,136		)	(24.4	)
Total	1,140,878			1,006,849			134,029			13.3
Selling, General & Administrative Expenses:
Technical Services	56,737			53,900			2,837			5.3
Field Services	19,802			17,933			1,869			10.4
Industrial Services	24,210			22,857			1,353			5.9
Oil and Gas Field Services	25,212			17,470			7,742			44.3
Corporate Items	71,931			66,592			5,339			8.0
Total	197,892			178,752			19,140			10.7
Adjusted EBITDA:
Technical Services	184,874			174,033			10,841			6.2
Field Services	15,599			31,527			(15,928		)	(50.5	)
Industrial Services	107,452			77,630			29,822			38.4
Oil and Gas Field Services	60,961			45,748			15,213			33.3
Corporate Items	(78,710		)	(76,289		)	(2,421		)	3.2
Total	$	290,176		$	252,649		$	37,527		14.9	%

_______________________

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

Revenues

Technical Services revenues increased7.5%, or $48.5 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to an increase in volumes being processed through our incinerators, landfills, treatment, storage and disposal facilities, and waste water treatment plants.

Field Services revenues decreased19.1%, or $38.9 million, in the nine months ended September 30, 2012 from the

35

comparable period in 2011. Field Services performed emergency response work related to the Yellowstone River oil spill in Montana during the nine months ended September 30, 2011 which accounted for $41.5 million of our third party revenues.

Industrial Services revenues increased27.5%, or $94.6 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to an increase in our lodging business ($78.1 million), growth in the oil sands region of Canada, and an increase in a broad array of our specialty services. These increases resulted partially from revenues associated with our acquisitions in 2012 and 2011, including Peak in June 2011.

Oil and Gas Field Services revenues increased35.5%, or $85.7 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to fluids handling and surface rentals activity related to the acquisition of Peak in June 2011 ($41.3 million) and increased exploration activities partially from revenues associated with an acquisition in July 2011($43.1 million), offset partially by a reduction in the energy services business ($9.4 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 general conditions of the oil and gas industries, competitive industry pricing, and the effects of fuel prices on our fuel recovery fees.

Cost of Revenues

Technical Services cost of revenues increased8.2%, or $34.8 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to increases in salary and labor expenses ($8.3 million), materials for reclaim costs ($6.0 million), outside disposal and rail costs ($5.8 million), chemicals and consumables expenses ($3.1), subcontractor fees ($1.8 million), vehicle and equipment repair costs ($1.5 million), changes in environmental estimate ($1.4 million) and outside transportation costs ($1.3 million), offset partially by a decrease in foreign exchange costs ($1.5 million).

Field Services cost of revenues decreased16.1%, or $24.8 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due primarily due decreased emergency response work. During the three months ended September 30, 2011 Field Services performed emergency response work to the Yellowstone River oil spill in Montana.

Industrial Services cost of revenues increased26.0%, or $63.4 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to increased salary and labor expenses ($31.5 million), material and supplies expenses ($21.0 million), catering costs associated with the increased lodging services revenues ($4.8 million) and equipment rental fees ($4.8 million). These increases resulted partially from costs associated with recent acquisitions in 2012 and 2011, including Peak in June 2011.

Oil and Gas Field Services cost of revenues increased35.2%, or $62.8 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to salary and labor expenses ($29.9 million), subcontractor fees ($8.5 million), travel costs ($5.0 million), vehicle expenses ($3.9 million), rent expense ($3.8 million), equipment repair expenses ($3.5 million) and equipment rental fees ($2.9 million), offset partially by decreases in foreign exchange costs ($3.7 million). These net increases resulted partially from costs associated with acquisitions in 2011.

 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 increased5.3%, or $2.8 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to increased salaries expense offset partially by environmental changes in estimate.

Field Services selling, general and administrative expenses increased10.4%, or $1.9 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to increased salaries expense.

Industrial Services selling, general and administrative expenses increased5.9%, or $1.4 million, in the nine months ended September 30, 2012 from the comparable period in 2011 primarily due to the 2012 acquisitions resulting in increased salaries expense.

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Oil and Gas Field Services selling, general and administrative expenses increased44.3%, or $7.7 million, for the nine months ended September 30, 2012, from the comparable period in 2011. The increase was primarily due to the 2011 acquisitions resulting in increases in salaries, commissions and bonus expense, and travel expense.

Corporate Items selling, general and administrative expenses increased8.0%, or $5.3 million, for the nine months ended September 30, 2012, as compared to the same period in 2011 primarily due to increases in salaries ($3.8 million), travel costs related primarily to a national sales meeting held in April ($1.8 million), employee benefits ($1.5 million) and a year-over-year benefit in environmental changes in estimate ($0.7 million), offset by decreased incentive compensation ($2.9 million).

Depreciation and Amortization

	Nine Months Ended September 30,
	(in thousands)
	2012		2011
Depreciation of fixed assets	$	92,346	$	70,410
Landfill and other amortization	24,448		16,590
Total depreciation and amortization	$	116,794	$	87,000

Depreciation and amortization increased 34.2%, or $29.8 million, in the first nine months of 2012 compared to the same period in 2011. 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 increased volumes at our landfill facilities and increase in other intangibles resulting from recent acquisitions.

Interest Expense, Net

	Nine Months Ended September 30,
	(in thousands)
	2012			2011
Interest expense	$	34,459		$	28,747
Interest income	(623		)	(700		)
Interest expense, net	$	33,836		$	28,047

Interest expense, net increased $5.8 million in the first nine months of 2012 compared to the same period in 2011. The increase in interest expense was primarily due to the issuance of $800.0 million senior unsecured notes offset by the redemption and repurchase of $520.0 million senior secured notes in July 2012. Although interest expense increased, the result of the transactions resulted in an additional amount of notes at a more favorable coupon rate.

Loss on Early Extinguishment of Debt

During the third quarter of 2012, we recorded a $26.4 million loss on early extinguishment of debt in connection with a redemption and repurchase of our $520.0 million previously outstanding senior secured notes. This loss consisted of $21.1 million of purchase, consent and redemption fees and non-cash expenses of $5.3 million, of which $8.8 million related to unamortized financing costs offset partially by $3.5 million of unamortized net premium.

Income Taxes

Our effective tax rate for the three and nine months ended September 30, 2012 was 33.8% and 35.6%, compared to 33.7% and 34.7% for the same periods in 2011. The increase in the effective tax rate for the nine months ended September 30, 2012 was primarily attributable to the recording of the investment tax credit for the solar energy project and a partial release of a valuation allowance associated with the Company's foreign tax credit both recorded in 2011.

Income tax expense for the three months ended September 30, 2012 decreased $12.6 million to $6.3 million from $18.9 million for the comparable period in 2011. Income tax expense for the nine months ended September 30, 2012 decreased $9.8 million to $37.5 million from $47.3 million for the comparable period in 2011. The decreased tax expense for the three and nine months ended September 30, 2012 was primarily attributable to our $26.4 million loss on early extinguishment of debt related to our redemption and repurchase of $520.0 million senior secured notes in July 2012.

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A valuation allowance is required to be established when, based on an evaluation of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. At September 30, 2012 and December 31, 2011, we had a remaining valuation allowance of $12.0 million and $11.5 million, respectively. The allowance as of September 30, 2012 consisted of $10.2 million of foreign tax credits, $1.3 million of state and federal net operating loss carryforwards and $0.5 million of foreign net operating loss carryforwards. The allowance as of December 31, 2011 consisted of $10.2 million of foreign tax credits, $1.1 million of state net operating loss carryforwards and $0.2 million of foreign net operating loss carryforwards.

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, 2012 and December 31, 2011, included accrued interest and penalties of $28.8 million and $26.8 million, respectively.  Tax expense for each of the three months ended September 30, 2012 and 2011 included interest and penalties of $0.7 million and $0.9 million, respectively.

The Company believes that it is reasonably possible that total unrecognized tax benefits and related reserves will decrease by approximately $63.8 million within the next twelve months as a result of the lapse of the statute of limitations. The $63.8 million (which includes interest and penalties of $28.6 million) is primarily related to a historical Canadian debt restructuring transaction and, if realized, will be recorded in earnings and therefore will impact the effective income tax rate.

Liquidity and Capital Resources

Cash and Cash Equivalents

During the nine months ended September 30, 2012, cash and cash equivalents increased$262.9 million primarily related to cash flow from operations, issuance of $800.0 million of senior unsecured notes, partially offset by the redemption and repurchase of the $520.0 million senior secured notes and acquisition payments.

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. On October 29, 2012, the Company signed a definitive agreement to acquire 100% of the outstanding common shares of Safety-Kleen, a leading North American used oil recycling and re-refining, parts cleaning and environmental solutions company. We are currently considering several financing options for the transaction that include a combination of existing cash, debt and equity. If however, in the event that more favorable financing arrangements could not be secured, we contemporaneously entered into a commitment letter agreement with Goldman Sachs Bank USA to borrow up to $475.0 million of variable rate secured loans and up to $375.0 million of unsecured senior increasing rate bridge loans. We anticipate that with a combination of existing cash, debt and equity financing options, our cash flow provided by operating activities will provide the necessary funds on a short and long term basis to meet operating cash requirements.

At September 30, 2012, cash and cash equivalents totaled $523.6 million, compared to $260.7 million at December 31, 2011. At September 30, 2012, cash and cash equivalents held by foreign subsidiaries totaled $82.0 million and were readily convertible into other foreign currencies including U.S. dollars. At September 30, 2012, the cash and cash equivalent balances for our U.S. operations were $441.6 million. Our U.S. operations had net operating cash from operations of $48.6 million for the nine months ended September 30, 2012. Additionally, we have available a $250.0 million revolving credit facility of which $163.4 million was available to borrow at September 30, 2012. Based on the above and on our current plans, we believe that our U.S. operations have adequate financial resources to satisfy their liquidity needs without being required to repatriate earnings from foreign subsidiaries. Accordingly, although repatriation to the U.S. of foreign earnings would generally be subject to U.S. income taxation, net of any available foreign tax credits, we have not recorded any deferred tax liability related to such repatriation since we intend to permanently reinvest foreign earnings outside the U.S.

We had accrued environmental liabilities as of September 30, 2012 of approximately $167.2 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

38

credit facility provide additional potential sources of liquidity should they be required.

Cash Flows for the nine months ended September 30, 2012

Cash from operating activities in the first nine months of 2012 was $232.7 million, an increase of 53.8%, or $81.4 million, compared with cash from operating activities in the first nine months of 2011. The change was primarily the result of increased depreciation and amortization primarily due to acquisitions and other increased capital expenditures in recent periods and a net increase in working capital items.

Cash used for investing activities in the first nine months of 2012 was $226.4 million, a decrease of 49.2% or $219.2 million, compared with cash used for investing activities in the first nine months of 2011.  The change was due primarily from lower year-over-year costs associated with acquisitions offset partially by increases in additions to property, plant and equipment.

Cash used for financing activities in the first nine months of 2012 was $256.1 million, compared with cash from financing activities of $247.9 million in the first nine months of 2011. The change was primarily the result of the issuance of $800.0 million aggregate principal amount of 5.25% senior unsecured notes and the $520.0 million redemption and repurchase of the 7.625% senior secured notes during the third quarter of 2012.

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, compared with cash used for operating activities of $153.9 million 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 resulted primarily from year-over-year higher costs associated with additions to property, plant and equipment and acquisitions.

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 the redemption of debt in the third quarter of 2010.

Financing Arrangements

On July 13, 2012, we redeemed $30.0 million principal amount of the $520.0 million aggregate principal amount of our 2016 Notes which were outstanding on June 30, 2012 in accordance with the terms of the 2016 Notes. On July 16, 2012, we commenced a tender offer to purchase any and all of the $490.0 million aggregate principal amount of the then outstanding 2016 Notes which remained outstanding following such partial redemption. On July 30, 2012, we purchased the $339.1 million principal amount of the 2016 Notes which had been tendered by July 27, 2012, and called for redemption on August 15, 2012 the $150.9 million principal amount of the 2016 Notes which had not been tendered. We financed that purchase and call for redemption of the 2016 Notes through a private placement of $800.0 million aggregate principal amount of 5.25% senior unsecured notes due 2020 (the “New Notes”) which we also completed on July 30, 2012. We intend to use the $262.8 million of remaining net proceeds from such private placement of the New Notes to finance potential future acquisitions and for general corporate purposes. We completed these transactions to obtain more liquidity with improved terms and conditions. For further detail, see Note 9, "Financing Arrangements," to our consolidated financial statements included in Item 1 of this report.

As of September 30, 2012, 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, 2012, $36.2 million of unrecognized tax benefits and related reserves and $28.8 million of potential interest and 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 might make any cash payments to settle these liabilities. However, we believe no material cash payments will be required in the next 12 months.

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Auction Rate Securities

As of September 30, 2012, our long-term investments included $4.3 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. As of September 30, 2012, we have recorded an unrealized pre-tax loss of $0.4 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.

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, 2012 (in thousands): 

	Three Months Remaining
Scheduled Maturity Dates	2012			2013			2014			2015			2016			Thereafter			Total
Senior unsecured notes	$	—		$	—		$	—		$	—		$	—		$	800,000		$	800,000
Capital lease obligations	2,518			4,239			2,305			352			—			—			9,414
	$	2,518		$	4,239		$	2,305		$	352		$	—		$	800,000		$	809,414
Weighted average interest rate on fixed rate borrowings	5.3		%	5.3		%	5.3		%	5.3		%	5.3		%	5.3		%

In addition to the fixed rate borrowings described in the above table, we had at September 30, 2012 variable rate instruments that included a revolving credit facility with maximum borrowings of up to $250.0 million (with a $215.0 million sub-limit for letters of credit). Commencing in 2013, we will begin remitting interest payments in the amount of $21.0 million each related to the $800.0 million senior unsecured notes payable semi-annually on August 1 and February 1 of each year .

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 2012, the Canadian subsidiaries transacted approximately 2.4% 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 $1.0 million and $0.4 million for the three months ended September 30, 2012 and 2011, 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 $2.3 million and $1.0 million for the nine months ended September 30, 2012 and 2011, respectively. 

At September 30, 2012, $4.3 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.

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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 on 10-Q, 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, 2012 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 quarter ending September 30, 2012 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

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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

In light of our signing on October 26, 2012 of an agreement to acquire Safety-Kleen, Inc., the following supplements and updates Item 1A,“Risk Factors,” of our Annual Report on Form 10-K for the year ended December 31, 2011.

Risks Related to Our Proposed Acquisition of Safety-Kleen

We cannot assure you that our proposed acquisition of Safety-Kleen will be completed.

On October 26, 2012, we entered into an agreement and plan of merger with Safety-Kleen, Inc. (“Safety-Kleen”) pursuant to which we will acquire Safety-Kleen for cash in an amount (subject to working capital and other closing adjustments) equal to $1.25 billion. We now anticipate the acquisition will be completed in the fourth quarter of 2012. However, consummation of the acquisition will be subject to certain conditions including, among others: (i) approval by Safety-Kleen shareholders holding at least a majority of outstanding Safety-Kleen shares (although shareholders holding approximately 81% of such shares have entered into voting and lock-up agreements pursuant to which they have generally agreed to vote such shares in favor of the acquisition); (ii) expiration or termination of the applicable Hart-Scott-Rodino and Canadian Competition Bureau antitrust waiting periods; (iii) accuracy of the representations and warranties of the parties, in each case subject to certain materiality exceptions; (iv) compliance by the parties with their respective obligations under the merger agreement, subject to certain materiality exceptions; (v) the parties having executed certain other documents and ancillary agreements at or prior to the closing of the acquisition; and (vi) the absence of any material adverse effect relating to Safety-Kleen and its subsidiaries, taken as a whole, subject to certain exceptions. Furthermore, we or Safety-Kleen may terminate the merger agreement if the merger is not consummated by April 26, 2013, except if the transaction date is extended. We cannot assure you that the required conditions will be met or that the proposed acquisition will be completed.

If we are unable to successfully integrate the business and operations of Safety-Kleen into our business and operations and realize synergies in the expected time frame, our future results would be adversely affected.

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

If the combined company is not able to achieve these objectives, the anticipated benefits to us of the acquisition 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 business, failure to implement the business plan for the combined company, unanticipated issues in integrating operating, 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 Safety-Kleen's customers and employees or to achieve the anticipated benefits of the acquisition.

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The Safety-Kleen acquisition may expose us to unknown liabilities.

Because the merger agreement provides that we will acquire all the outstanding common shares of Safety-Kleen, our investment will be subject to all of Safety-Kleen's liabilities other than its currently outstanding debt which will paid off at the time of the acquisition. If there are unknown liabilities or other obligations, including contingent liabilities, our business could be materially affected. We may learn additional information about Safety-Kleen that adversely affects us, such as unknown liabilities or other 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.

We will incur significant transaction and acquisition-related costs in connection with the acquisition.

We will incur significant costs in connection with the acquisition and may incur additional unanticipated costs to retain key employees.In addition, until the closing of the acquisition, we expect to incur certain non-recurring costs associated with financing the acquisition.We will also be subject to capital market risks in connection with our plan to raise financing to fund the portion of the purchase price above the amount of our now available cash which we plan to use. In the event that less than all of the acquisition purchase price is available to us at the time of closing through our available cash and such debt and / or equity financings as we may elect to pursue, we would be required to draw under the back-up financing commitment we have obtained from Goldman Sachs Bank USA in connection with acquisition, and the cost to do so may be less favorable to us than if we finance the acquisition through alternative financing.

Failure to complete our proposed acquisition of Safety-Kleen could negatively affect our stock price as well as our future business and financial results.

If the acquisition is not completed, we will be subject to a number of risks, including but not limited to the following:

• we must pay costs related to the acquisition including, among others, legal accounting and financial advisory fees, as well as fees and expenses with respect to the back-up financing commitment we have obtained, whether or not the acquisition is completed; and

• we could be subject to litigation related to our failure to complete the acquisition and various other factors, which could adversely affect our business, financial results and stock price.

Fluctuations in oil prices may have a negative effect on Safety-Kleen's future results of operations.

A significant portion of Safety-Kleen's business involves collecting used oil from certain of its customers, re-refining a portion of such used oil into base and blended lubricating oils, and then selling both such re-refined oil and the excess recycled oil which Safety-Kleen does not have the capacity to re-refine (“RFO”) to other customers.The prices at which Safety-Kleen sellsits re-refined oil and RFO are affected by changes in the reported spot market prices of oil. If applicable rates increase or decrease, Safety-Kleen typically will charge a higher or lower corresponding price for its re-refined oil and RFO. The price at which Safety-Kleen sellsits re-refined oil and RFO is affected by changes in certain indices measuring changes in the price of heavy fuel oil, with increases and decreases in the indices typically translating into a higher or lower price for Safety-Kleen's RFO. The cost to collect used oil, including the amounts Safety-Kleen must pay to obtain used oil and the fuel costs of its oil collection fleet, typically also increases or decreases when the relevant indices increase or decrease. However, even though the prices Safety-Kleen can charge for its re-refined oil and RFO and the costs to collect and re-refine used oil and process RFO typically increase and decrease together, there is no assurance that when Safety-Kleen's costs to collect and re-refine used oil and process RFO increase it will be able to increase the prices it charges for its re-refined oil and RFO to cover such increased costs or that the costs to collect and re-refine used oil and process RFO will decline when the prices it can charge for re-refined oil and RFO decline. These risks are exacerbated when there are rapid fluctuations in these oil indices.

The price at which Safety-Kleen purchases used oil from its large customers through its oil collection services is generally fixed for a period of time by contract, in some cases for up to 90 days. Because the price Safety-Kleen pays for a majority of its used oil is fixed for a period of time and it can take up to eight weeks to transport, re-refine and blend collected used oil into Safety-Kleen's finished blended lubricating oil products, Safety-Kleen typically experiences margin contraction during periods when the applicable index rates decline. If the index rates decline rapidly, Safety-Kleen may be locked into paying higher than market prices for used oil during these contracted periods while the prices it can charge for its finished oil products decline. If the prices Safety-Klee charges for its finished oil products and the costs to collect and re-refine used oil and process RFO do not move together or in similar magnitudes, Safety-Kleen's profitability may be materially and negatively impacted.

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Safety-Kleen has entered into several commodity derivatives since 2011, which are comprised of cashless collar contracts related to crude oil, in each case, where Safety-Kleen sold a call option to a bank and then purchased a put option from the same bank, in order to manage against significant fluctuations in crude oil, which are closely correlated with indices discussed above. However, these commodity derivatives are designed to only mitigate Safety-Kleen's exposure to declines in these oil indices below a price floor, and Safety-Kleen will not be protected and its profitability may be materially and negatively impacted by declines above the price floor. In addition, these commodity derivatives will limit Safety-Kleen's potential benefit when these oil indices increase above a price cap because Safety-Kleenwill be required to make payments in that circumstance. Furthermore, Safety-Kleen's current commodity derivatives expire at various intervals, and there is no assurance that we or Safety-Kleen will be able to enter into commodity derivatives in the future with acceptable terms.

Item 5—Other Information

Subsequent to the issuance of the Company's Form 10-Q for the period ended March 31, 2012, management identified a disclosure error in Note 15, ''Guarantor and Non-Guarantor Subsidiaries Financial Information.'' The previously disclosed guarantor information did not provide the details of comprehensive income by guarantor for the periods ended March 31, 2012 and 2011. While the Form 10-Q for the period ended March 31, 2012, was not materially misstated, the Company will provide the guarantor comprehensive income disclosure within its Form 10-Q for the period ended March 31, 2013. For the period ended March 31, 2012, the other comprehensive income and comprehensive income was $15.2 million and $47.2 million, respectively, for Clean Harbors, Inc., $15.2 million and $71.8 million, respectively, for the U.S. Guarantors, and $6.3 million and $25.6 million, respectively, for the Foreign Non-Guarantors. For the period ended March 31, 2011, the other comprehensive income and comprehensive income was $16.5 million and $39.2 million, respectively, for Clean Harbors, Inc., $16.5 million and $51.4 million, respectively, for the U.S. Guarantors and $5.7 million and $14.9 million, respectively, for the Foreign Non-Guarantors.

Item 6—Exhibits

Item No.	Description	Location
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 Robert E. Gagnon	Filed herewith
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, 2012, formatted in XBRL: (i) Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Income, (iii) Unaudited Consolidated Statements of Comprehensive Income, (iv) Unaudited Consolidated Statements of Cash Flows, (v) Unaudited Consolidated Statements of Stockholders’ Equity, and (vi) 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.

44

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, 2012
		By:	/s/  ROBERT E. GAGNON
			Robert E. Gagnon
			Executive Vice President and Chief Financial Officer
Date:	November 9, 2012

45

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, 2012

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Robert E. Gagnon, 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/ Robert E. Gagnon

Robert E. Gagnon

Executive Vice President and Chief Financial Officer

Date: November 9, 2012

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, 2012 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, 2012
		By:	/s/  ROBERT E. GAGNON
			Robert E. Gagnon
			Executive Vice President and Chief Financial Officer
Date:	November 9, 2012

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BUSINESS COMBINATIONS (Details)		3 Months Ended
	Sep. 30, 2012 Acquisitions During 2012 [Member] USD ($)	Sep. 30, 2012 Acquisitions During 2011 [Member] USD ($)		Sep. 30, 2011 Acquisitions During 2011 [Member] USD ($)	Sep. 30, 2011 Acquisitions During 2011 [Member] Oil and Gas Field Services USD ($)	Sep. 30, 2011 Acquisitions During 2011 [Member] Technical Services [Member] USD ($)	Sep. 30, 2011 Acquisitions During 2011 [Member] Industrial Services USD ($)	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') USD ($)	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') CAD	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') Oil and Gas Field Services USD ($)	Jun. 10, 2011 Peak Energy Services Ltd.'s ('Peak') Industrial Services USD ($)	Jun. 30, 2012 Scenario, Previously Reported [Member] Acquisitions During 2011 [Member] USD ($)		Jun. 10, 2011 Scenario, Previously Reported [Member] Peak Energy Services Ltd.'s ('Peak') USD ($)
Business Combinations
Business Combination	$ 83,700,000			$ 142,100,000				$ 205,100,000	200,200,000
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred	7,700,000			(25,200,000)					37,500,000
Post-closing adjustments	3,900,000			4,500,000
Business Combination, Acquired Receivables, Fair Value	7,300,000			21,400,000				33,300,000
Customer receivables, gross amount due				22,100,000				34,700,000
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 (In CAD)									158,700,000
Cash paid per share in exchange for acquisition (in dollars per share)								$ 0.95
Exchange rate translation									0.976057
Summary of Recognised Amounts of Identifiable Assets and Liabilities Assumed [Roll Forward]
Current assets												41,491,000	[1]	45,222,000	[1]
Current assets, Measurement Period Adjustments		60,000	[2]
Current assets, (As adjusted)		41,551,000	[2]									41,491,000	[1]	45,222,000	[1]
Property, plant and equipment												62,969,000		151,574,000
Property, plant and equipment, Measurement Period Adjustements		0
Property, plant and equipment, (As adjusted)		62,969,000										62,969,000		151,574,000
Identifiable intangible assets												23,371,000		12,337,000
Customer relationships and other intangibles, Measurement Period Adjustements		0
Identifiable intangible assets ( As adjusted)		23,371,000										23,371,000		12,337,000
Other assets												1,671,000		8,009,000
Other assets, Measurement Period Adjustements		0
Other assets (As adjusted)		1,671,000										1,671,000		8,009,000
Current liabilities												(23,403,000)		(28,785,000)
Current liabilities, Measurement Period Adjustements		255,000
Current liabilities (As adjusted)		(23,148,000)										(23,403,000)		(28,785,000)
Asset retirement obligations and remedial liabilities												(200,000)		(103,000)
Asset retirement obligations and remedial liabilities, Measurement Period Adjustments		0
Asset retirement obligations and remedial liabilities (As adjusted)		(200,000)										(200,000)		(103,000)
Other liabilities												(2,419,000)		(11,341,000)
Other liabilities, Measurement Period Adjustments		0
Other liabilities (As adjusted)		(2,419,000)										(2,419,000)		(11,341,000)
Total identifiable net assets		103,795,000										103,480,000		176,913,000
Total identifiable net assets, Measurement Period Adjustments		315,000
Goodwill					13,300,000	11,100,000	13,900,000			12,900,000	15,300,000	38,654,000	[3]	28,220,000	[3]
Goodwill, Measurement Period Adjustments		(315,000)	[3]
Goodwill (As adjusted)		38,339,000	[3]		13,300,000	11,100,000	13,900,000			12,900,000	15,300,000	38,654,000	[3]	28,220,000	[3]
Total (As adjusted)		142,134,000										142,134,000		205,133,000
Total, Measurement Period Adjustments		$ 0

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

[2] The fair value of the financial assets acquired includes customer receivables with an aggregate fair value of $21.4 million. Combined gross amounts due were $22.1 million

[3] Goodwill, which is attributable to expected operating and cross-selling synergies, will not be deductible for tax purposes. Goodwill of $12.9 million and $15.3 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectively.

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 523,614	$ 260,723	$ 257,159	$ 257,159	$ 302,210
Intercompany receivables	0	0
Other current assets	585,674	631,145
Property, plant and equipment, net	1,003,414	903,947
Investments in subsidiaries	0	0
Intercompany debt receivable	0	0
Other long-term assets	336,701	289,988
Total assets	2,449,403	2,085,803
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	365,563	381,742
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	147,693	155,142
Long-term obligations	800,000	524,203
Capital lease obligations, net	3,477	6,375
Intercompany debt payable	0	0
Other long-term liabilities	125,915	117,354
Total liabilities	1,442,648	1,184,816
Stockholders' equity	1,006,755	900,987
Total liabilities and stockholders' equity	2,449,403	2,085,803
Clean Harbors, Inc.
ASSETS
Cash and cash equivalents	327,020	91,581	91,557		100,476
Intercompany receivables	328,608	319,444
Other current assets	26,065	43,687
Property, plant and equipment, net	0	0
Investments in subsidiaries	1,218,442	1,064,966
Intercompany debt receivable	0	0
Other long-term assets	12,735	13,228
Total assets	1,912,870	1,532,906
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	11,976	15,612
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	800,000	524,203
Capital lease obligations, net	0	0
Intercompany debt payable	3,701	3,701
Other long-term liabilities	90,438	88,403
Total liabilities	906,115	631,919
Stockholders' equity	1,006,755	900,987
Total liabilities and stockholders' equity	1,912,870	1,532,906
U.S. Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	114,602	128,071	145,150		124,582
Intercompany receivables	0	0
Other current assets	342,516	324,607
Property, plant and equipment, net	449,338	392,566
Investments in subsidiaries	502,375	421,648
Intercompany debt receivable	485,539	472,929
Other long-term assets	141,232	111,104
Total assets	2,035,602	1,850,925
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	234,742	220,968
Intercompany payables	444,484	446,267
Closure, post-closure and remedial liabilities, net	124,481	133,773
Long-term obligations	0	0
Capital lease obligations, net	289	475
Intercompany debt payable	0	0
Other long-term liabilities	7,798	7,588
Total liabilities	811,794	809,071
Stockholders' equity	1,223,808	1,041,854
Total liabilities and stockholders' equity	2,035,602	1,850,925
Foreign Non-Guarantor Subsidiaries
ASSETS
Cash and cash equivalents	81,992	41,071	20,452		77,152
Intercompany receivables	115,876	126,823
Other current assets	217,093	262,851
Property, plant and equipment, net	554,076	511,381
Investments in subsidiaries	91,751	91,654
Intercompany debt receivable	3,701	3,701
Other long-term assets	182,734	165,656
Total assets	1,247,223	1,203,137
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	118,845	145,162
Intercompany payables	0	0
Closure, post-closure and remedial liabilities, net	23,212	21,369
Long-term obligations	0	0
Capital lease obligations, net	3,188	5,900
Intercompany debt payable	485,539	472,929
Other long-term liabilities	27,679	21,363
Total liabilities	658,463	666,723
Stockholders' equity	588,760	536,414
Total liabilities and stockholders' equity	1,247,223	1,203,137
Consolidating Adjustments
ASSETS
Cash and cash equivalents	0	0
Intercompany receivables	(444,484)	(446,267)
Other current assets	0	0
Property, plant and equipment, net	0	0
Investments in subsidiaries	(1,812,568)	(1,578,268)
Intercompany debt receivable	(489,240)	(476,630)
Other long-term assets	0	0
Total assets	(2,746,292)	(2,501,165)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities	0	0
Intercompany payables	(444,484)	(446,267)
Closure, post-closure and remedial liabilities, net	0	0
Long-term obligations	0	0
Capital lease obligations, net	0	0
Intercompany debt payable	(489,240)	(476,630)
Other long-term liabilities	0	0
Total liabilities	(933,724)	(922,897)
Stockholders' equity	(1,812,568)	(1,578,268)
Total liabilities and stockholders' equity	$ (2,746,292)	$ (2,501,165)

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INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Income Tax Disclosure [Abstract]
The Company's effective tax rate (including taxes on income from discontinued operations) (as a percent)	33.80%	33.70%	35.60%	34.70%
Unrecognized tax benefits and related reserves including interest and penalties	$ 36.2		$ 36.2		$ 36.2
Unrecognized tax benefits, interest	28.8		28.8		26.8
Anticipated decrease in unrecognized tax benefits (including interest and penalties) in the next twelve months	63.8		63.8
Anticipated decrease in interest and penalties included in unrecognized tax benefits, in the next twelve months	$ 28.6		$ 28.6

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidating statement of income
Revenues	$ 533,806	$ 556,053	$ 1,628,946	$ 1,438,250
Cost of revenues (exclusive of items shown separately below)	372,940	386,518	1,140,878	1,006,849
Selling, general and administrative expenses	60,339	65,704	197,892	178,752
Accretion of environmental liabilities	2,488	2,435	7,409	7,231
Depreciation and amortization	41,300	34,604	116,794	87,000
Income from operations	56,739	66,792	165,973	158,418
Other (expense) income	(91)	164	(465)	5,931
Gains (Losses) on Extinguishment of Debt	(26,385)	0	(26,385)	0
Interest (expense) income	(11,596)	(10,927)	(33,836)	(28,047)
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	18,667	56,029	105,287	136,302
Provision (benefit) for income taxes	6,308	18,896	37,487	47,283
Net income	12,359	37,133	67,800	89,019
Other comprehensive (loss) income	29,980	(58,144)	27,703	(38,537)
Comprehensive income	42,339	(21,011)	95,503	50,482
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	9	27	27	77
Accretion of environmental liabilities	0	0	0	0
Depreciation and amortization	0	0	0	0
Income from operations	(9)	(27)	(27)	(77)
Other (expense) income	0	0	0	0
Gains (Losses) on Extinguishment of Debt	(26,385)		(26,385)
Interest (expense) income	(11,247)	(10,739)	(32,679)	(28,045)
Equity in earnings of subsidiaries	50,039	52,408	124,965	129,273
Intercompany dividend income (expense)	0	0	10,010	0
Intercompany interest income (expense)	0	0	0	0
Income from continuing operations, before provision for income taxes	12,398	41,642	75,884	101,151
Provision (benefit) for income taxes	39	4,509	8,084	12,132
Net income	12,359	37,133	67,800	89,019
Other comprehensive (loss) income	29,980	(58,144)	27,703	(38,537)
Comprehensive income	42,339	(21,011)	95,503	50,482
U.S. Guarantor Subsidiaries
Consolidating statement of income
Revenues	314,822	327,093	920,101	838,654
Cost of revenues (exclusive of items shown separately below)	218,697	229,272	630,652	582,767
Selling, general and administrative expenses	35,810	39,889	122,167	114,621
Accretion of environmental liabilities	2,150	2,120	6,430	6,297
Depreciation and amortization	20,778	16,069	56,568	41,760
Income from operations	37,387	39,743	104,284	93,209
Other (expense) income	(8)	51	(333)	3,781
Gains (Losses) on Extinguishment of Debt	0		0
Interest (expense) income	180	(10)	0	163
Equity in earnings of subsidiaries	15,869	18,548	49,236	50,260
Intercompany dividend income (expense)	0	0	0	0
Intercompany interest income (expense)	10,290	6,759	30,894	24,459
Income from continuing operations, before provision for income taxes	63,718	65,091	184,081	171,872
Provision (benefit) for income taxes	3,831	8,335	19,473	21,511
Net income	59,887	56,756	164,608	150,361
Other comprehensive (loss) income	29,980	(58,144)	27,703	(38,537)
Comprehensive income	89,867	(1,388)	192,311	111,824
Foreign Non-Guarantor Subsidiaries
Consolidating statement of income
Revenues	223,982	237,589	724,532	619,615
Cost of revenues (exclusive of items shown separately below)	159,241	165,875	525,913	444,101
Selling, general and administrative expenses	24,520	25,788	75,698	64,054
Accretion of environmental liabilities	338	315	979	934
Depreciation and amortization	20,522	18,535	60,226	45,240
Income from operations	19,361	27,076	61,716	65,286
Other (expense) income	(83)	113	(132)	2,150
Gains (Losses) on Extinguishment of Debt	0		0
Interest (expense) income	(529)	(178)	(1,157)	(165)
Equity in earnings of subsidiaries	0	0	0	0
Intercompany dividend income (expense)	3,439	3,491	10,354	10,484
Intercompany interest income (expense)	(10,290)	(6,759)	(30,894)	(24,459)
Income from continuing operations, before provision for income taxes	11,898	23,743	39,887	53,296
Provision (benefit) for income taxes	2,438	6,052	9,930	13,640
Net income	9,460	17,691	29,957	39,656
Other comprehensive (loss) income	13,042	(20,839)	11,370	(15,044)
Comprehensive income	22,502	(3,148)	41,327	24,612
Consolidating Adjustments
Consolidating statement of income
Revenues	(4,998)	(8,629)	(15,687)	(20,019)
Cost of revenues (exclusive of items shown separately below)	(4,998)	(8,629)	(15,687)	(20,019)
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 (expense) income	0	0	0	0
Gains (Losses) on Extinguishment of Debt			0
Interest (expense) income	0	0	0	0
Equity in earnings of subsidiaries	(65,908)	(70,956)	(174,201)	(179,533)
Intercompany dividend income (expense)	(3,439)	(3,491)	(20,364)	(10,484)
Intercompany interest income (expense)	0	0	0	0
Income from continuing operations, before provision for income taxes	(69,347)	(74,447)	(194,565)	(190,017)
Provision (benefit) for income taxes	0		0	0
Net income	(69,347)	(74,447)	(194,565)	(190,017)
Other comprehensive (loss) income	(43,022)	78,983	(39,073)	53,581
Comprehensive income	$ (112,369)	$ 4,536	$ (233,638)	$ (136,436)

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REMEDIAL LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at the beginning of the period	$ 135,320
Accretion	4,454
Changes in estimates recorded to statement of income	(4,489)
Expenditures	(5,273)
Currency translation and other	600
Balance at the end of the period	130,612
Remedial Liabilities for Landfill Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at the beginning of the period	5,600
Accretion	206
Changes in estimates recorded to statement of income	(50)
Expenditures	(65)
Currency translation and other	99
Balance at the end of the period	5,790
Remedial Liabilities for Inactive Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at the beginning of the period	78,449
Accretion	2,585
Changes in estimates recorded to statement of income	(846)
Expenditures	(3,488)
Currency translation and other	4
Balance at the end of the period	76,704
Remedial Liabilities (Including Superfund) for Non-Landfill Operations
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at the beginning of the period	51,271
Accretion	1,663
Changes in estimates recorded to statement of income	(3,593)
Expenditures	(1,720)
Currency translation and other	497
Balance at the end of the period	$ 48,118

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FINANCING ARRANGEMENTS (Tables)

9 Months Ended

Sep. 30, 2012

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, 2012		December 31, 2011
Senior secured notes, at 7.625%, due August 15, 2016	$	—	$	520,000
Senior unsecured notes, at 5.25%, due August 1, 2020	800,000		—
Revolving credit facility, due May 31, 2016	—		—
Unamortized notes premium and discount, net	—		4,203
Long-term obligations	$	800,000	$	524,203

Schedule of Debt Instrument Redemption Price [Table Text Block]

The Company may redeem some or all of the New Notes at any time on or after August 1, 2016 upon not less than 30 nor more than 60 days' notice, at the following redemption prices (expressed as percentages of the principal amount) if redeemed during the twelve-month period commencing on August 1 of the year set forth below, plus, in each case, accrued and unpaid interest, if any, to the date of redemption: 

Year	Percentage
2016	102.625	%
2017	101.313	%
2018 and thereafter	100.000	%

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SUBSEQUENT EVENT Subsequent Event (Details) (Safety-Kleen [Member], Acquisition [Member], USD $)	Oct. 26, 2012
Safety-Kleen [Member] | Acquisition [Member]
Subsequent Event [Line Items]
Business Acquisition, Cost of Acquired Entity, Purchase Price	$ 1,250,000,000
Business Acquisition, Contingent Consideration, Working Capital, Basis	$ 50,000,000

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SUBSEQUENT EVENT

9 Months Ended

Sep. 30, 2012

Subsequent Events [Abstract]

SUBSEQUENT EVENT

SUBSEQUENT EVENT

On October 26, 2012, the Company signed an agreement and plan of merger (the "Merger Agreement") which provides that, subject to the terms and conditions contained in the Merger Agreement, the Company will acquire 100% jof Safety-Kleen, a Delaware corporation headquartered in Richardson, Texas. Safety-Kleen is the largest re-refiner and recycler of used oil in North America and a leading provider of parts cleaning and environmental services. Safety-Kleen services commercial and industrial customers in the U.S., Canada and Puerto Rico. The proposed addition of Safety-Kleen aligns with the Company's acquisition strategy of increasing density in its existing markets and establishing leadership positions in new markets.

Under the terms of the Merger Agreement, the Company will pay to Safety-Kleen shareholders cash consideration in an amount equal to $1.25 billion plus the amount of cash and cash equivalents held by Safety-Kleen on the closing date less the amount of debt held by Safety-Kleen on the closing date, plus or minus, as applicable, the amount by which Safety-Kleen's working capital (excluding cash) on the closing date exceeds or is less than $50 million.

The Merger Agreement is not subject to a financing contingency. The Company has received a backup financing commitment from Goldman Sachs Bank USA, but is considering other financing options, which may include a combination of existing cash, debt and equity. The acquisition is subject to approval by regulators and the Safety-Kleen shareholders, as well as other customary closing conditions, and is expected to be completed by the end of 2012. The Merger Agreement is subject to termination by either the Company or Safety-Kleen under certain circumstances.

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EARNINGS PER SHARE (TEXT) (Details) (Outstanding Stock Awards [Member]) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Outstanding Stock Awards [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	66	73	66	73

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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Y	Sep. 30, 2011	Dec. 31, 2011 Y
Finite-lived intangible assets
Cost	$ 237,287,000		$ 237,287,000		$ 212,188,000
Accumulated Amortization	85,477,000		85,477,000		72,544,000
Net	151,810,000		151,810,000		139,644,000
Weighted Average Amortization Period (in years)			8.9		10.0
Aggregate amortization expense	4,400,000	3,200,000	11,800,000	8,700,000
Permits
Finite-lived intangible assets
Cost	114,910,000		114,910,000		106,939,000
Accumulated Amortization	48,907,000		48,907,000		45,629,000
Net	66,003,000		66,003,000		61,310,000
Weighted Average Amortization Period (in years)			17.8		17.9
Customer relationships
Finite-lived intangible assets
Cost	98,613,000		98,613,000		83,721,000
Accumulated Amortization	25,113,000		25,113,000		17,650,000
Net	73,500,000		73,500,000		66,071,000
Weighted Average Amortization Period (in years)			7.0		7.9
Other intangible assets
Finite-lived intangible assets
Cost	23,764,000		23,764,000		21,528,000
Accumulated Amortization	11,457,000		11,457,000		9,265,000
Net	12,307,000		12,307,000		12,263,000
Weighted Average Amortization Period (in years)			3.5		5.3
Acquisition [Member] | Customer relationships
Finite-lived intangible assets
Net	12,800,000		12,800,000
Weighted Average Amortization Period (in years)			7.6
Acquisition [Member] | Other intangible assets
Finite-lived intangible assets
Net					$ 600,000
Weighted Average Amortization Period (in years)			2.8

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Tables)

9 Months Ended

Sep. 30, 2012

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

Schedule of condensed consolidating balance sheet

Following is the condensed consolidating balance sheet at September 30, 2012 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	327,020	$	114,602	$	81,992	$	—		$	523,614
Intercompany receivables	328,608		—		115,876		(444,484		)	—
Other current assets	26,065		342,516		217,093		—			585,674
Property, plant and equipment, net	—		449,338		554,076		—			1,003,414
Investments in subsidiaries	1,218,442		502,375		91,751		(1,812,568		)	—
Intercompany debt receivable	—		485,539		3,701		(489,240		)	—
Other long-term assets	12,735		141,232		182,734		—			336,701
Total assets	$	1,912,870	$	2,035,602	$	1,247,223	$	(2,746,292	)	$	2,449,403
Liabilities and Stockholders’ Equity:
Current liabilities	$	11,976	$	234,742	$	118,845	$	—		$	365,563
Intercompany payables	—		444,484		—		(444,484		)	—
Closure, post-closure and remedial liabilities, net	—		124,481		23,212		—			147,693
Long-term obligations	800,000		—		—		—			800,000
Capital lease obligations, net	—		289		3,188		—			3,477
Intercompany debt payable	3,701		—		485,539		(489,240		)	—
Other long-term liabilities	90,438		7,798		27,679		—			125,915
Total liabilities	906,115		811,794		658,463		(933,724		)	1,442,648
Stockholders’ equity	1,006,755		1,223,808		588,760		(1,812,568		)	1,006,755
Total liabilities and stockholders’ equity	$	1,912,870	$	2,035,602	$	1,247,223	$	(2,746,292	)	$	2,449,403

Following is the condensed consolidating balance sheet at December 31, 2011 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	91,581	$	128,071	$	41,071	$	—		$	260,723
Intercompany receivables	319,444		—		126,823		(446,267		)	—
Other current assets	43,687		324,607		262,851		—			631,145
Property, plant and equipment, net	—		392,566		511,381		—			903,947
Investments in subsidiaries	1,064,966		421,648		91,654		(1,578,268		)	—
Intercompany debt receivable	—		472,929		3,701		(476,630		)	—
Other long-term assets	13,228		111,104		165,656		—			289,988
Total assets	$	1,532,906	$	1,850,925	$	1,203,137	$	(2,501,165	)	$	2,085,803
Liabilities and Stockholders’ Equity:
Current liabilities	$	15,612	$	220,968	$	145,162	$	—		$	381,742
Intercompany payables	—		446,267		—		(446,267		)	—
Closure, post-closure and remedial liabilities, net	—		133,773		21,369		—			155,142
Long-term obligations	524,203		—		—		—			524,203
Capital lease obligations, net	—		475		5,900		—			6,375
Intercompany debt payable	3,701		—		472,929		(476,630		)	—
Other long-term liabilities	88,403		7,588		21,363		—			117,354
Total liabilities	631,919		809,071		666,723		(922,897		)	1,184,816
Stockholders’ equity	900,987		1,041,854		536,414		(1,578,268		)	900,987
Total liabilities and stockholders’ equity	$	1,532,906	$	1,850,925	$	1,203,137	$	(2,501,165	)	$	2,085,803

Schedule of consolidating statement of income

Following is the consolidating statement of income (loss) for the three months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	314,822		$	223,982		$	(4,998	)	$	533,806
Cost of revenues (exclusive of items shown separately below)	—			218,697			159,241			(4,998		)	372,940
Selling, general and administrative expenses	9			35,810			24,520			—			60,339
Accretion of environmental liabilities	—			2,150			338			—			2,488
Depreciation and amortization	—			20,778			20,522			—			41,300
Income from operations	(9		)	37,387			19,361			—			56,739
Other expense	—			(8		)	(83		)	—			(91		)
Loss on early extinguishment of debt	(26,385		)	—			—						(26,385		)
Interest (expense) income	(11,247		)	180			(529		)	—			(11,596		)
Equity in earnings of subsidiaries	50,039			15,869			—			(65,908		)	—
Intercompany dividend income (expense)	—			—			3,439			(3,439		)	—
Intercompany interest income (expense)	—			10,290			(10,290		)	—			—
Income before provision for income taxes	12,398			63,718			11,898			(69,347		)	18,667
Provision for income taxes	39			3,831			2,438			—			6,308
Net income	12,359			59,887			9,460			(69,347		)	12,359
Other comprehensive income (loss)	29,980			29,980			13,042			(43,022		)	29,980
Comprehensive income (loss)	$	42,339		$	89,867		$	22,502		$	(112,369	)	$	42,339

Following is the consolidating statement of income (loss) 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	(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 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	37,133			56,756			17,691			(74,447		)	37,133
Other comprehensive (loss) income	(58,144		)	(58,144		)	(20,839		)	78,983			(58,144		)
Comprehensive (loss) income	$	(21,011	)	$	(1,388	)	$	(3,148	)	$	4,536		$	(21,011	)

Following is the consolidating statement of income for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	920,101		$	724,532		$	(15,687	)	$	1,628,946
Cost of revenues (exclusive of items shown separately below)	—			630,652			525,913			(15,687		)	1,140,878
Selling, general and administrative expenses	27			122,167			75,698			—			197,892
Accretion of environmental liabilities	—			6,430			979			—			7,409
Depreciation and amortization	—			56,568			60,226			—			116,794
Income from operations	(27		)	104,284			61,716			—			165,973
Other expense	—			(333		)	(132		)	—			(465		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest (expense) income	(32,679		)	—			(1,157		)	—			(33,836		)
Equity in earnings of subsidiaries	124,965			49,236			—			(174,201		)	—
Intercompany dividend income (expense)	10,010			—			10,354			(20,364		)	—
Intercompany interest income (expense)	—			30,894			(30,894		)	—			—
Income before provision for income taxes	75,884			184,081			39,887			(194,565		)	105,287
Provision for income taxes	8,084			19,473			9,930			—			37,487
Net income	67,800			164,608			29,957			(194,565		)	67,800
Other comprehensive income (loss)	27,703			27,703			11,370			(39,073		)	27,703
Comprehensive income (loss)	$	95,503		$	192,311		$	41,327		$	(233,638	)	$	95,503

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 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
Other comprehensive (loss) income	(38,537		)	(38,537		)	(15,044		)	53,581			(38,537		)
Comprehensive income (loss)	$	50,482		$	111,824		$	24,612		$	(136,436	)	$	50,482

Schedule of condensed consolidating statement of cash flows

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(49,918	)	$	98,497		$	184,113		$	232,692
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,664		)	(54,662		)	(130,326		)
Proceeds from sales of fixed assets	—			3,411			779			4,190
Acquisitions, net of cash acquired	—			(51,424		)	(41,051		)	(92,475		)
Costs to obtain or renew permits	—			(625		)	(1,784		)	(2,409		)
Purchase of marketable securities	—			—			(10,517		)	(10,517		)
Other	—			603			4,517			5,120
Net cash from investing activities	—			(123,699		)	(102,718		)	(226,417		)
Cash flows from financing activities:
Change in uncashed checks	—			(7,771		)	(6,184		)	(13,955		)
Proceeds from exercise of stock options	231			—			—			231
Proceeds from employee stock purchase plan	4,627			—			—			4,627
Remittance of shares, net	(1,604		)	—			—			(1,604		)
Excess tax benefit of stock-based compensation	1,786			—			—			1,786
Deferred financing costs paid	(9,638		)	—			—			(9,638		)
Payments on capital leases	—			(781		)	(4,522		)	(5,303		)
Principal payment on debt	(520,000		)	—			—			(520,000		)
Issuance of senior unsecured notes	800,000			—			—			800,000
Distribution of cash earned on employee participation plan	(55		)	—			—			(55		)
Dividends (paid) / received	10,010			(23,669		)	13,659			—
Interest (payments) / received	—			43,954			(43,954		)	—
Net cash from financing activities	285,357			11,733			(41,001		)	256,089
Effect of exchange rate change on cash	—			—			527			527
Increase in cash and cash equivalents	235,439			(13,469		)	40,921			262,891
Cash and cash equivalents, beginning of period	91,581			128,071			41,071			260,723
Cash and cash equivalents, end of period	$	327,020		$	114,602		$	81,992		$	523,614

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		)
Proceeds from sale of fixed assets	—			545			5,380			5,925
Acquisitions, net of cash acquired	—			(50,166		)	(286,794		)	(336,960		)
Costs to obtain or renew permits	—			(486		)	(1,870		)	(2,356		)
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 of 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
Increase (decrease) 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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COMMITMENTS AND CONTINGENCIES (Details)			3 Months Ended				12 Months Ended			12 Months Ended	3 Months Ended	12 Months Ended	21 Months Ended	1 Months Ended			3 Months Ended			12 Months Ended
	Sep. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2012 Legal and Administrative Proceedings USD ($)	Dec. 31, 2011 Legal and Administrative Proceedings USD ($)	Sep. 30, 2012 Ville Mercier USD ($)	Sep. 30, 2012 Ville Mercier CAD	Dec. 31, 1999 Ville Mercier Municipalities	Dec. 31, 1968 Ville Mercier Permits	Dec. 31, 2011 Ville Mercier USD ($)	Dec. 31, 2006 Deer Trail, Colorado Facility Lawsuits	Sep. 30, 2012 Superfund Proceedings Sites	Dec. 31, 2002 Superfund Proceedings Sites	May 31, 2006 Superfund Proceedings Sites	May 31, 2007 Casmalia Site Sites	Sep. 30, 2012 Marine Shale Site USD ($)	Dec. 31, 2011 Marine Shale Site USD ($)	Sep. 30, 2012 Certain Other Third Party Sites USD ($) Sites	Sep. 30, 2012 Federal and State Enforcement Actions USD ($) Proceedings	Dec. 31, 2011 Federal and State Enforcement Actions USD ($) Proceedings	Dec. 31, 2010 Other Contingencies USD ($)
Legal and Administrative Proceedings
Reserves relating to legal and administrative proceedings	$ 30,200,000	$ 30,300,000	$ 27,400,000															$ 2,800,000
Possible increase in legal and administrative proceedings			2,700,000	2,700,000
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
Damages claimed by municipalities					1,600,000
Suit against alleged past costs						17,400,000
Accrued remedial liabilities	130,612,000	135,320,000			14,200,000				13,300,000
Number of lawsuits filed										2
Superfund Proceedings
Number of sites subject to proceedings under federal or state superfund laws											68
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												66
Third party sites arising out of acquisition of assets												35
Third party sites requiring expenditure on remediation											7
Number of sites for which environmental remediation expense is settled											13
Number of sites for which environmental remediation expense is not required											15
Third party sites requiring expenditure on remediation being contested by the entity											1
Number of sites owned by third party excluded from cleanup or related liabilities											2
Third party sites where EPA requested information on prior owner														1
Remaining reserves relating to listed third party sites															4,000,000	3,800,000
Indemnification agreement with third party sites																	15
Additional cleanup liabilities, maximum																	100,000
Notices received from owners of third party sites seeking indemnification from the company													5
Federal and State Enforcement Actions
Number of proceedings relating to waste treatment																		3	4
Sanctions relating to waste treatment																		100,000	100,000
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

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FINANCING ARRANGEMENTS (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended									0 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Jul. 30, 2012 Senior secured notes	Jul. 13, 2012 Senior secured notes	Sep. 30, 2012 Senior secured notes	Aug. 15, 2012 Senior secured notes	Jul. 16, 2012 Senior secured notes	Jun. 30, 2012 Senior secured notes	Dec. 31, 2011 Senior secured notes	Sep. 30, 2012 Senior Note at 5.25% [Member]	Dec. 31, 2011 Senior Note at 5.25% [Member]	Jul. 30, 2012 Issuance of Debt [Member] Senior secured notes	Jul. 30, 2012 Issuance of Debt [Member] Senior secured notes Redemption Period, Twelve Month Period Commencing on August 1, 2016 [Member]	Jul. 30, 2012 Issuance of Debt [Member] Senior secured notes Redemption Period, Twelve Month Period Commencing on August 1, 2017 [Member]	Jul. 30, 2012 Issuance of Debt [Member] Senior secured notes Redemption Period, Commencing on August 1, 2018 [Member]	Jul. 30, 2012 Issuance of Debt [Member] Senior secured notes Redemption Period, Prior to August 1, 2015 [Member]	Jul. 30, 2012 Issuance of Debt [Member] Senior secured notes Redemption Period, Prior to August 1, 2015 [Member] Maximum [Member]
Financing arrangements
Senior secured notes								$ 0	$ 150,900,000	$ 490,000,000	$ 520,000,000	$ 520,000,000	$ 800,000,000	$ 0
Revolving credit facility, due May 31, 2016	0		0		0
Unamortized notes premium and discount, net								0				4,203,000
Long-term obligations	800,000,000		800,000,000		524,203,000
Debt Instrument, Interest Rate, Stated Percentage						5.25%		7.625%			7.625%		5.25%
Revolving credit facility, maximum borrowing capacity	163,400,000		163,400,000
Letters of Credit Outstanding, Amount	86,600,000		86,600,000
Extinguishment of Debt, Amount						339,100,000	30,000,000
Debt Instrument, Face Amount						800,000,000
Proceeds from Issuance of Long-term Debt						262,800,000
Gains (Losses) on Extinguishment of Debt	(26,385,000)	0	(26,385,000)	0		(26,400,000)
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost						21,100,000
Write off of Deferred Debt Issuance Cost						(5,300,000)
Unamortized Debt Issuance Expense						8,800,000
Debt Instrument, Unamortized Premium						$ 3,500,000
Interest Rate Computed On The Basis of a 360 Day Year															360 days
Interest at a Rate Computed on the Basis of Twelve 30-Day Month															30 days
Debt Instrument, Redemption Payment Term, Percentage of Principal Amount																				35.00%
Long-term Debt Redemption Price with Net Proceeds from Equity offerings as Percentage of Principal Amount																			105.25%
Long-term Debt Redemption, Price as Percentage of Principal Amount																102.625%	101.313%	100.00%	100.00%
Long-term Debt Redemption Price Due to Change of Control as Percentage of Principal Amount																			101.00%

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Accumulated Other Comprehensive Income	Accumulated Earnings
Balance at January 1, 2012 at Dec. 31, 2011	$ 900,987	$ 532	$ (469)	$ 497,919	$ 31,353	$ 371,652
Balance at January 1, 2012 (in shares) at Dec. 31, 2011		53,183
Increase (Decrease) in Stockholders' Equity
Net income	67,800					67,800
Other comprehensive income	27,703				27,703
Stock-based compensation	5,235			5,235
Stock-based compensation (in shares)		91
Issuance of restricted shares, net of shares remitted	(1,604)			(1,604)
Issuance of restricted shares, net of shares remitted (in shares)		(24)
Exercise of stock options	231	2		229
Exercise of stock options (in shares)		39
Net tax benefit on exercise of stock options	1,776			1,776
Net tax benefit on exercise of stock options (in shares)		97
Employee stock purchase plan	4,627			4,627
Employee stock purchase plan (in shares)		0
Balance at September 30, 2012 at Sep. 30, 2012	$ 1,006,755	$ 534	$ (469)	$ 508,182	$ 59,056	$ 439,452
Balance at September 30, 2012 (in shares) at Sep. 30, 2012		53,386

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GOODWILL AND OTHER INTANGIBLE ASSETS (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2012 (three months)	$ 4,146
2013	15,485
2014	15,007
2015	14,150
2016	13,478
Thereafter	83,749
Total	$ 146,015

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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 30, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes to goodwill

The changes to goodwill for the nine months ended September 30, 2012 were as follows (in thousands):

	2012
Balance at January 1, 2012	$	122,392
Acquired from acquisitions	27,449
Increase from adjustments related to the acquisitions during the measurement period	5,037
Currency translation	2,846
Balance at September 30, 2012	$	157,724

Summary of amortizable other intangible assets

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

	September 30, 2012							December 31, 2011
	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)
Permits	$	114,910	$	48,907	$	66,003	17.8	$	106,939	$	45,629	$	61,310	17.9
Customer relationships	98,613		25,113		73,500		7.0	83,721		17,650		66,071		7.9
Other intangible assets	23,764		11,457		12,307		3.5	21,528		9,265		12,263		5.3
	$	237,287	$	85,477	$	151,810	8.9	$	212,188	$	72,544	$	139,644	10.0

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, 2012 (in thousands):

Years Ending December 31,	Expected Amortization
2012 (three months)	$	4,146
2013	15,485
2014	15,007
2015	14,150
2016	13,478
Thereafter	83,749
	$	146,015

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FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 2012

Fair Value Disclosures [Abstract]

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

The following table presents 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, 2012 and 2011 (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2012		2011			2012		2011
Balance at beginning of period	$	4,326	$	5,311		$	4,245	$	5,437
Sale of auction rate securities	—		(1,000		)	—		(1,000		)
Unrealized gains (losses) included in other comprehensive income	—		(72		)	81		(198		)
Balance at September 30,	$	4,326	$	4,239		$	4,326	$	4,239

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Details 4) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2011
Condensed consolidating statement of cash flows
Proceeds from sale of long-term investments	$ 0	$ 1,000
Payments to Acquire Interest in Subsidiaries and Affiliates		0
Net cash from operating activities	232,692	151,336
Cash flows from investing activities:
Additions to property, plant and equipment	(130,326)	(113,644)
Proceeds from slales of fixed assets	4,190	5,925
Acquisitions, net of cash acquired	(92,475)	(336,960)
Costs to obtain or renew permits	(2,409)	(2,356)
Proceeds from Sale and Maturity of Available-for-sale Securities	0	425
Purchase of marketable securities	(10,517)	0
Other	5,120	0
Net cash used in investing activities	(226,417)	(445,610)
Cash flows from financing activities:
Change in uncashed checks	(13,955)	(2,580)
Proceeds from exercise of stock options	231	1,089
Proceeds from employee stock purchase plan	4,627	2,451
Remittance of shares, net	(1,604)	(1,897)
Excess tax benefit of stock-based compensation	1,786	1,949
Deferred financing costs paid	(9,638)	(8,442)
Payments on capital leases	(5,303)	(5,775)
Principal payment on debt	(520,000)	0
Proceeds from Issuance of Senior Long-term Debt	800,000
Distribution of cash earned on employee participation plan	(55)	(189)
Proceeds from Issuance of Secured Debt	0	261,250
Dividends (paid) / received	0	0
Interest (payments) / received	0	0
Proceeds from Intercompany Debt		0
Net cash from financing activities	256,089	247,856
Effect of exchange rate change on cash	527	1,367
(Decrease) increase in cash and cash equivalents	262,891	(45,051)
Cash and cash equivalents, beginning of period	260,723	302,210	257,159
Cash and cash equivalents, end of period	523,614	257,159	257,159
Clean Harbors, Inc.
Condensed consolidating statement of cash flows
Proceeds from sale of long-term investments		0
Payments to Acquire Interest in Subsidiaries and Affiliates		258,597
Net cash from operating activities	(49,918)	(16,908)
Cash flows from investing activities:
Additions to property, plant and equipment	0	0
Proceeds from slales of fixed assets	0	0
Acquisitions, net of cash acquired	0	0
Costs to obtain or renew permits	0	0
Proceeds from Sale and Maturity of Available-for-sale Securities		0
Purchase of marketable securities	0
Other	0
Net cash used in investing activities	0	(258,597)
Cash flows from financing activities:
Change in uncashed checks	0	0
Proceeds from exercise of stock options	231	1,089
Proceeds from employee stock purchase plan	4,627	2,451
Remittance of shares, net	(1,604)	(1,897)
Excess tax benefit of stock-based compensation	1,786	1,949
Deferred financing costs paid	(9,638)	(8,442)
Payments on capital leases	0	0
Distribution of cash earned on employee participation plan	(55)	0
Proceeds from Issuance of Secured Debt		261,250
Dividends (paid) / received	10,010	10,186
Interest (payments) / received	0	0
Proceeds from Intercompany Debt		0
Net cash from financing activities	285,357	266,586
Effect of exchange rate change on cash	0	0
(Decrease) increase in cash and cash equivalents	235,439	(8,919)
Cash and cash equivalents, beginning of period	91,581	100,476
Cash and cash equivalents, end of period	327,020	91,557
U.S. Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Proceeds from sale of long-term investments		1,000
Payments to Acquire Interest in Subsidiaries and Affiliates		(178,884)
Net cash from operating activities	98,497	77,653
Cash flows from investing activities:
Additions to property, plant and equipment	(75,664)	(75,274)
Proceeds from slales of fixed assets	3,411	545
Acquisitions, net of cash acquired	(51,424)	(50,166)
Costs to obtain or renew permits	(625)	(486)
Proceeds from Sale and Maturity of Available-for-sale Securities		0
Purchase of marketable securities	0
Other	603
Net cash used in investing activities	(123,699)	54,503
Cash flows from financing activities:
Change in uncashed checks	(7,771)	(1,363)
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	(781)	(532)
Principal payment on debt	0
Proceeds from Issuance of Senior Long-term Debt	0
Distribution of cash earned on employee participation plan	0	0
Proceeds from Issuance of Secured Debt		0
Dividends (paid) / received	(23,669)	(24,306)
Interest (payments) / received	43,954	35,088
Proceeds from Intercompany Debt		(120,475)
Net cash from financing activities	11,733	(111,588)
Effect of exchange rate change on cash	0	0
(Decrease) increase in cash and cash equivalents	(13,469)	20,568
Cash and cash equivalents, beginning of period	128,071	124,582
Cash and cash equivalents, end of period	114,602	145,150
Foreign Non-Guarantor Subsidiaries
Condensed consolidating statement of cash flows
Proceeds from sale of long-term investments		0
Payments to Acquire Interest in Subsidiaries and Affiliates		(79,713)
Net cash from operating activities	184,113	90,591
Cash flows from investing activities:
Additions to property, plant and equipment	(54,662)	(38,370)
Proceeds from slales of fixed assets	779	5,380
Acquisitions, net of cash acquired	(41,051)	(286,794)
Costs to obtain or renew permits	(1,784)	(1,870)
Proceeds from Sale and Maturity of Available-for-sale Securities		425
Purchase of marketable securities	(10,517)
Other	4,517
Net cash used in investing activities	(102,718)	(241,516)
Cash flows from financing activities:
Change in uncashed checks	(6,184)	(1,217)
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	(4,522)	(5,243)
Principal payment on debt	0
Proceeds from Issuance of Senior Long-term Debt	0
Distribution of cash earned on employee participation plan	0	(189)
Proceeds from Issuance of Secured Debt		0
Dividends (paid) / received	13,659	14,120
Interest (payments) / received	(43,954)	(35,088)
Proceeds from Intercompany Debt		120,475
Net cash from financing activities	(41,001)	92,858
Effect of exchange rate change on cash	527	1,367
(Decrease) increase in cash and cash equivalents	40,921	(56,700)
Cash and cash equivalents, beginning of period	41,071	77,152
Cash and cash equivalents, end of period	$ 81,992	$ 20,452

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ACCRUED EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Accrued Expenses [ABSTRACT]
Insurance	$ 22,602	$ 21,712
Interest	7,605	15,434
Accrued disposal costs	1,796	2,455
Accrued compensation and benefits	41,885	56,029
Income, real estate, sales and other taxes	24,568	14,863
Other	38,231	37,499
Total accrued expenses	$ 136,687	$ 147,992

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ACCRUED EXPENSES (Tables)

9 Months Ended

Sep. 30, 2012

Accrued Expenses [ABSTRACT]

Accrued expenses

Accrued expenses consisted of the following (in thousands):

	September 30, 2012		December 31, 2011
Insurance	$	22,602	$	21,712
Interest	7,605		15,434
Accrued disposal costs	1,796		2,455
Accrued compensation and benefits	41,885		56,029
Income, real estate, sales and other taxes	24,568		14,863
Other	38,231		37,499
	$	136,687	$	147,992

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CLOSURE AND POST-CLOSURE LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2012

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, 2012 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2012	$	25,764		$	9,117		$	34,881
New asset retirement obligations	2,292			—			2,292
Accretion	2,145			810			2,955
Changes in estimates recorded to statement of income	490			446			936
Other changes in estimates recorded to balance sheet	(2,058		)	15			(2,043		)
Expenditures	(1,995		)	(565		)	(2,560		)
Currency translation and other	120			52			172
Balance at September 30, 2012	$	26,758		$	9,875		$	36,633

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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities:
Net income	$ 67,800	$ 89,019
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	116,794	87,000
Allowance for doubtful accounts	809	623
Amortization of deferred financing costs and debt discount	1,173	1,230
Accretion of environmental liabilities	7,409	7,231
Changes in environmental liability estimates	(3,553)	(2,467)
Deferred income taxes	(494)	(197)
Stock-based compensation	5,235	5,329
Excess tax benefit of stock-based compensation	(1,786)	(1,949)
Income tax benefit related to stock option exercises	1,776	1,949
Other expense (income)	465	(2,577)
Write-off deferred financing costs and debt discount	5,341	0
Environmental expenditures	(7,833)	(8,551)
Changes in assets and liabilities, net of acquisitions
Accounts receivable	59,881	(32,670)
Other current assets	5,130	(14,113)
Accounts payable	(18,969)	30,241
Other current and long-term liabilities	(6,486)	(8,762)
Net cash from operating activities	232,692	151,336
Cash flows from investing activities:
Additions to property, plant and equipment	(130,326)	(113,644)
Proceeds from sales of fixed assets	4,190	5,925
Acquisitions, net of cash acquired	(92,475)	(336,960)
Additions to intangible assets, including costs to obtain or renew permits	(2,409)	(2,356)
Purchase of marketable securities	(10,517)	0
Proceeds from sales of marketable securities	0	425
Other	5,120	0
Proceeds from sale of long-term investments	0	1,000
Net cash used in investing activities	(226,417)	(445,610)
Cash flows from financing activities:
Change in uncashed checks	(13,955)	(2,580)
Proceeds from exercise of stock options	231	1,089
Remittance of shares, net	(1,604)	(1,897)
Proceeds from employee stock purchase plan	4,627	2,451
Deferred financing costs paid	(9,638)	(8,442)
Payments on capital leases	(5,303)	(5,775)
Principal payment on debt	(520,000)	0
Distribution of cash earned on employee participation plan	(55)	(189)
Excess tax benefit of stock-based compensation	1,786	1,949
Issuance of senior unsecured notes, at par	800,000	0
Issuance of senior secured notes, including premium	0	261,250
Net cash from financing activities	256,089	247,856
Effect of exchange rate change on cash	527	1,367
Increase in cash and cash equivalents	262,891	(45,051)
Cash and cash equivalents, beginning of period	260,723	302,210
Cash and cash equivalents, end of period	523,614	257,159
Cash payments for interest and income taxes:
Interest paid	41,176	30,169
Income taxes paid	5,578	35,085
Non-cash investing and financing activities:
Property, plant and equipment accrued	$ 31,978	$ 20,288

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REMEDIAL LIABILITIES (Tables)

9 Months Ended

Sep. 30, 2012

Environmental Remediation Obligations [Abstract]

Changes to remedial liabilities

The changes to remedial liabilities for the nine months ended September 30, 2012 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, 2012	$	5,600		$	78,449		$	51,271		$	135,320
Accretion	206			2,585			1,663			4,454
Changes in estimates recorded to statement of income	(50		)	(846		)	(3,593		)	(4,489		)
Expenditures	(65		)	(3,488		)	(1,720		)	(5,273		)
Currency translation and other	99			4			497			600
Balance at September 30, 2012	$	5,790		$	76,704		$	48,118		$	130,612

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FAIR VALUE MEASUREMENTS (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Long-term Debt, Fair Value	$ 820,900,000		$ 820,900,000		$ 538,500,000
Marketable securities	11,113,000		11,113,000		111,000
Auction rate securities	4,326,000		4,326,000		4,245,000
Unrealized pre-tax gain (loss) on auction rate securities			100,000
Temporary decline in fair value of securities	400,000		400,000
Total | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities	11,113,000		11,113,000		111,000
Auction rate securities	4,326,000		4,326,000		4,245,000
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Auction rate securities
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities
Auction rate securities
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Marketable securities
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	4,326,000	5,311,000	4,245,000	5,437,000
Sale of auction rate securities	0	(1,000,000)	0	(1,000,000)
Unrealized (losses) gains included in other comprehensive income	0	(72,000)	81,000	(198,000)
Balance at the end of the period	$ 4,326,000	$ 4,239,000	$ 4,326,000	$ 4,239,000

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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 segment	Sep. 30, 2011	Dec. 31, 2011
Segment reporting information
Third party revenues	$ 533,806	$ 556,053	$ 1,628,946	$ 1,438,250
Intersegment revenues, net
Direct revenues	533,806	556,053	1,628,946	1,438,250
Property, plant and equipment, net	1,003,414		1,003,414		903,947
Goodwill	157,724		157,724		122,392
Permits and other intangibles, net	151,810		151,810		139,644
Total assets	2,449,403		2,449,403		2,085,803
Reconciliation to Consolidated Statements of Income:
Reporting segments number			4
Number of operations for which the revenues are insignificant			2
Accretion of environmental liabilities	2,488	2,435	7,409	7,231
Depreciation and amortization	41,300	34,604	116,794	87,000
Income from operations	56,739	66,792	165,973	158,418
Other expense (income)	91	(164)	465	(5,931)
Loss on early extinguishment of debt	26,385	0	26,385	0
Interest expense, net of interest income	11,596	10,927	33,836	28,047
Income from continuing operations, before provision for income taxes	18,667	56,029	105,287	136,302
United States
Segment reporting information
Total assets	1,427,861		1,427,861		1,119,491
Canada
Segment reporting information
Total assets	1,021,542		1,021,542		961,936
Other foreign
Segment reporting information
Total assets	0		0		4,376
Reportable segments
Segment reporting information
Adjusted EBITDA, Total	100,527	103,831	290,176	252,649
Property, plant and equipment, net	1,003,414		1,003,414		903,947
Total Intangible assets	309,534		309,534		262,036
Total assets	2,449,403		2,449,403		2,085,803
Technical Services
Segment reporting information
Third party revenues	236,605	221,424	676,074	633,187
Intersegment revenues, net	5,501	6,934	22,779	17,181
Direct revenues	242,106	228,358	698,853	650,368
Adjusted EBITDA, Total	67,332	62,531	184,874	174,033
Property, plant and equipment, net	323,159		323,159		308,118
Goodwill	45,473		45,473		44,410
Permits and other intangibles, net	79,615		79,615		81,605
Total Intangible assets	125,088		125,088		126,015
Total assets	619,868		619,868		604,904
Field Services
Segment reporting information
Third party revenues	60,194	105,181	174,557	216,377
Intersegment revenues, net	(2,531)	(5,661)	(10,309)	(13,279)
Direct revenues	57,663	99,520	164,248	203,098
Adjusted EBITDA, Total	5,707	19,318	15,599	31,527
Property, plant and equipment, net	35,323		35,323		30,296
Goodwill	2,232		2,232		2,232
Permits and other intangibles, net	3,140		3,140		1,204
Total Intangible assets	5,372		5,372		3,436
Total assets	47,001		47,001		37,850
Industrial Services
Segment reporting information
Third party revenues	149,120	123,639	458,858	351,534
Intersegment revenues, net	(4,599)	(171)	(19,970)	(7,217)
Direct revenues	144,521	123,468	438,888	344,317
Adjusted EBITDA, Total	37,860	25,933	107,452	77,630
Property, plant and equipment, net	301,748		301,748		254,469
Goodwill	69,870		69,870		45,444
Permits and other intangibles, net	34,537		34,537		19,701
Total Intangible assets	104,407		104,407		65,145
Total assets	445,048		445,048		345,202
Oil and Gas Field Services
Segment reporting information
Third party revenues	87,619	105,546	318,158	236,553
Intersegment revenues, net	2,296	(532)	8,962	4,859
Direct revenues	89,915	105,014	327,120	241,412
Adjusted EBITDA, Total	14,752	25,062	60,961	45,748
Property, plant and equipment, net	278,245		278,245		267,987
Goodwill	40,149		40,149		30,306
Permits and other intangibles, net	34,518		34,518		37,134
Total Intangible assets	74,667		74,667		67,440
Total assets	377,938		377,938		429,938
Corporate Items
Segment reporting information
Third party revenues	268	263	1,299	599
Intersegment revenues, net	(667)	(570)	(1,462)	(1,544)
Direct revenues	(399)	(307)	(163)	(945)
Adjusted EBITDA, Total	(25,124)	(29,013)	(78,710)	(76,289)
Property, plant and equipment, net	64,939		64,939		43,077
Total assets	$ 959,548		$ 959,548		$ 667,909

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CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 523,614	$ 260,723
Marketable securities	11,113	111
Accounts receivable, net of allowances aggregating $11,103 and $12,683, respectively	399,362	449,553
Unbilled accounts receivable	34,401	29,385
Deferred costs	6,995	5,903
Prepaid expenses and other current assets	53,252	73,349
Supplies inventories	63,934	56,242
Deferred tax assets	16,617	16,602
Total current assets	1,109,288	891,868
Property, plant and equipment:
Land	37,735	37,185
Asset retirement costs (non-landfill)	2,565	2,529
Landfill assets	69,544	58,466
Buildings and improvements	196,612	189,445
Camp equipment	136,797	110,242
Vehicles	281,690	231,980
Equipment	806,177	729,154
Furniture and fixtures	3,993	3,759
Construction in progress	51,466	24,522
Property, plant and equipment, gross	1,586,579	1,387,282
Less-accumulated depreciation and amortization	583,165	483,335
Total property, plant and equipment, net	1,003,414	903,947
Other assets:
Long-term investments	4,326	4,245
Deferred financing costs	12,530	13,607
Goodwill	157,724	122,392
Permits and other intangibles	151,810	139,644
Other	10,311	10,100
Total other assets	336,701	289,988
Total assets	2,449,403	2,085,803
Current liabilities:
Current portion of capital lease obligations	5,937	8,310
Accounts payable	174,327	178,084
Deferred revenue	29,060	32,297
Accrued expenses	136,687	147,992
Current portion of closure, post-closure and remedial liabilities	19,552	15,059
Total current liabilities	365,563	381,742
Other liabilities:
Closure and post-closure liabilities, less current portion of $6,921 and $3,885, respectively	29,712	30,996
Remedial liabilities, less current portion of $12,631 and $11,174, respectively	117,981	124,146
Long-term obligations	800,000	524,203
Capital lease obligations, less current portion	3,477	6,375
Unrecognized tax benefits and other long-term liabilities	125,915	117,354
Total other liabilities	1,077,085	803,074
Common stock, $.01 par value:
Authorized 80,000,000; shares issued and outstanding 53,386,280 and 53,182,859 shares, respectively	534	532
Shares held under employee participation plan	(469)	(469)
Additional paid-in capital	508,182	497,919
Accumulated other comprehensive income	59,056	31,353
Accumulated earnings	439,452	371,652
Total stockholders' equity	1,006,755	900,987
Total liabilities and stockholders' equity	$ 2,449,403	$ 2,085,803

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CLOSURE AND POST-CLOSURE LIABILITIES (Details) (USD $)	2 Months Ended	7 Months Ended	9 Months Ended
	Sep. 30, 2012	Jul. 31, 2012	Sep. 30, 2012	Sep. 30, 2012 Landfill Retirement Liability	Sep. 30, 2012 Non-Landfill Retirement Liability	Sep. 30, 2012 Senior Notes [Member]	Aug. 15, 2012 Senior Notes [Member]	Jul. 30, 2012 Senior Notes [Member]	Jul. 16, 2012 Senior Notes [Member]	Jun. 30, 2012 Senior Notes [Member]	Dec. 31, 2011 Senior Notes [Member]
Changes to post-closure liabilities
Balance at the beginning of the period		$ 34,881,000	$ 34,881,000	$ 25,764,000	$ 9,117,000
New asset retirement obligations			2,292,000	2,292,000
Accretion			2,955,000	2,145,000	810,000
Changes in estimates recorded to statement of income			936,000	490,000	446,000
Other changes in estimates recorded to balance sheet			(2,043,000)	(2,058,000)	15,000
Expenditures			(2,560,000)	(1,995,000)	(565,000)
Currency translation and other			172,000	120,000	52,000
Balance at the end of the period	36,633,000		36,633,000	26,758,000	9,875,000
Inflation rate (as a percent)			1.02%
Debt Instrument, Face Amount								800,000,000
Senior secured notes						$ 0	$ 150,900,000		$ 490,000,000	$ 520,000,000	$ 520,000,000
Credit-adjusted risk-free rate (as a percent)	6.66%	8.56%

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income	$ 12,359	$ 37,133	$ 67,800	$ 89,019
Other Comprehensive Income [Abstract]
Unrealized losses on available-for-sale securities (net of taxes of $146 and $63 for the quarter and year-to-date 2012 and $33 and $211 for the quarter and year-to-date 2011, respectively)	894	(14)	310	(805)
Foreign currency translation adjustments	29,086	(58,130)	27,393	(37,732)
Other comprehensive income (loss)	29,980	(58,144)	27,703	(38,537)
Comprehensive income	$ 42,339	$ (21,011)	$ 95,503	$ 50,482

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STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2012

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 months ended September 30, 2012, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2012			September 30, 2012
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	33,494	$	53.41	108,761	$	60.49
Performance stock awards	1,392	$	53.41	70,511	$	66.98
Total awards	34,886			179,272

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 30, 2012

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, 2012 and December 31, 2011, the Company had recorded reserves of $30.2 million and $30.3 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, 2012 and December 31, 2011, the Company also believed that it was reasonably possible that the amount of these potential liabilities could be as much as $2.7 million more. 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, 2012, the $30.2 million of reserves consisted of (i) $27.4 million related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets and (ii) $2.8 million primarily related to federal and state enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

As of September 30, 2012, the principal legal and administrative proceedings in which the Company was involved 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. In 1999, Ville Mercier and three neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec claiming a 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 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, 2012 and December 31, 2011, the Company had accrued $14.2 million and $13.3 million, respectively, for remedial liabilities relating to the Ville Mercier legal proceedings.

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. On December 16, 2011, the parties to the lawsuits described above reached an Agreement in Principle (“AIP”) to resolve all outstanding disputes. The AIP required additional approvals by County and State authorities before a final settlement and dismissal of the lawsuits can be finalized, and the approvals were obtained in November 2012.

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 68 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 68 sites, two involve facilities that are now owned by the Company and 66 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 66 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, seven are currently requiring expenditures on remediation, 13 are now settled, and 15 are not currently requiring expenditures on remediation. The status of one of the facilities now owned by the Company (the BR Facility) and one of the Listed Third Party Sites (the Casmalia site) 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.

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.  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, 2012 and December 31, 2011, the amount of the Company’s reserves relating to the Marine Shale site was $4 million and $3.8 million, respectively.

Certain Other Third Party Sites.  At 15 of the 66 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 15 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 15 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 66 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, 2012 and December 31, 2011, there were three and four proceedings, respectively, for which the Company reasonably believed that the sanctions could equal or exceed $100,000. The Company believes that the fines or other penalties in these or any of the other regulatory proceedings, individually or in the aggregate, will not have a material adverse effect on its financial condition, results of operations or cash flows.

Other Contingencies

In December 2010, the Company paid $10.5 million to acquire a minority interest in Safety-Kleen, Inc. ("Safety-Kleen"). Subsequent to the purchase of those securities but prior to December 31, 2010, Safety-Kleen 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 attributable to the minority interest by the privately-held company and 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. Subsequent to September 30, 2012, the Company has stayed the litigation pending the completion of the Company's proposed acquisition of Safety-Kleen.

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SEGMENT REPORTING (Tables)

9 Months Ended

Sep. 30, 2012

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 months ended September 30, 2012 and 2011 (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, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	236,605	$	60,194		$	149,120		$	87,619	$	268		$	533,806
Intersegment revenues, net	5,501		(2,531		)	(4,599		)	2,296		(667		)	—
Direct revenues	$	242,106	$	57,663		$	144,521		$	89,915	$	(399	)	$	533,806

	For the Three Months Ended September 30, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	221,424	$	105,181		$	123,639		$	105,546		$	263		$	556,053
Intersegment revenues, net	6,934		(5,661		)	(171		)	(532		)	(570		)	—
Direct revenues	$	228,358	$	99,520		$	123,468		$	105,014		$	(307	)	$	556,053

	For the Nine Months Ended September 30, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	676,074	$	174,557		$	458,858		$	318,158	$	1,299		$	1,628,946
Intersegment revenues, net	22,779		(10,309		)	(19,970		)	8,962		(1,462		)	—
Direct revenues	$	698,853	$	164,248		$	438,888		$	327,120	$	(163	)	$	1,628,946

	For the Nine Months Ended September 30, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	633,187	$	216,377		$	351,534		$	236,553	$	599		$	1,438,250
Intersegment revenues, net	17,181		(13,279		)	(7,217		)	4,859		(1,544		)	—
Direct revenues	$	650,368	$	203,098		$	344,317		$	241,412	$	(945	)	$	1,438,250

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, other expense (income), and loss on early extinguishment of debt to its segments.

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Adjusted EBITDA:
Technical Services	$	67,332		$	62,531		$	184,874		$	174,033
Field Services	5,707			19,318			15,599			31,527
Industrial Services	37,860			25,933			107,452			77,630
Oil and Gas Field Services	14,752			25,062			60,961			45,748
Corporate Items	(25,124		)	(29,013		)	(78,710		)	(76,289		)
Total	$	100,527		$	103,831		$	290,176		$	252,649
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	$	2,488		$	2,435		$	7,409		$	7,231
Depreciation and amortization	41,300			34,604			116,794			87,000
Income from operations	56,739			66,792			165,973			158,418
Other expense (income)	91			(164		)	465			(5,931		)
Loss on early extinguishment of debt	26,385			—			26,385			—
Interest expense, net of interest income	11,596			10,927			33,836			28,047
Income before provision for income taxes	$	18,667		$	56,029		$	105,287		$	136,302

PP&E and intangible assets by segment

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

	September 30, 2012		December 31, 2011
Property, plant and equipment, net
Technical Services	$	323,159	$	308,118
Field Services	35,323		30,296
Industrial Services	301,748		254,469
Oil and Gas Field Services	278,245		267,987
Corporate Items	64,939		43,077
Total property, plant and equipment, net	$	1,003,414	$	903,947
Intangible assets:
Technical Services
Goodwill	$	45,473	$	44,410
Permits and other intangibles, net	79,615		81,605
Total Technical Services	125,088		126,015
Field Services
Goodwill	2,232		2,232
Permits and other intangibles, net	3,140		1,204
Total Field Services	5,372		3,436
Industrial Services
Goodwill	69,870		45,444
Permits and other intangibles, net	34,537		19,701
Total Industrial Services	104,407		65,145
Oil and Gas Field Services
Goodwill	40,149		30,306
Permits and other intangibles, net	34,518		37,134
Total Oil and Gas Field Services	74,667		67,440
Total	$	309,534	$	262,036

Total assets by segment

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

	September 30, 2012		December 31, 2011
Technical Services	$	619,868	$	604,904
Field Services	47,001		37,850
Industrial Services	445,048		345,202
Oil and Gas Field Services	377,938		429,938
Corporate Items	959,548		667,909
Total	$	2,449,403	$	2,085,803

Total assets by geographical area

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

	September 30, 2012		December 31, 2011
United States	$	1,427,861	$	1,119,491
Canada	1,021,542		961,936
Other foreign	—		4,376
Total	$	2,449,403	$	2,085,803

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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

9 Months Ended

Sep. 30, 2012

Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract]

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION

The New Notes are and the 2016 Notes were guaranteed by substantially all of the Company's subsidiaries organized in the United States. Each guarantor for the New Notes and the 2016 Notes is a wholly-owned subsidiary of the Company and its guarantee is both full and unconditional and joint and several.  The New Notes are and the 2016 Notes were 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, 2012 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	327,020	$	114,602	$	81,992	$	—		$	523,614
Intercompany receivables	328,608		—		115,876		(444,484		)	—
Other current assets	26,065		342,516		217,093		—			585,674
Property, plant and equipment, net	—		449,338		554,076		—			1,003,414
Investments in subsidiaries	1,218,442		502,375		91,751		(1,812,568		)	—
Intercompany debt receivable	—		485,539		3,701		(489,240		)	—
Other long-term assets	12,735		141,232		182,734		—			336,701
Total assets	$	1,912,870	$	2,035,602	$	1,247,223	$	(2,746,292	)	$	2,449,403
Liabilities and Stockholders’ Equity:
Current liabilities	$	11,976	$	234,742	$	118,845	$	—		$	365,563
Intercompany payables	—		444,484		—		(444,484		)	—
Closure, post-closure and remedial liabilities, net	—		124,481		23,212		—			147,693
Long-term obligations	800,000		—		—		—			800,000
Capital lease obligations, net	—		289		3,188		—			3,477
Intercompany debt payable	3,701		—		485,539		(489,240		)	—
Other long-term liabilities	90,438		7,798		27,679		—			125,915
Total liabilities	906,115		811,794		658,463		(933,724		)	1,442,648
Stockholders’ equity	1,006,755		1,223,808		588,760		(1,812,568		)	1,006,755
Total liabilities and stockholders’ equity	$	1,912,870	$	2,035,602	$	1,247,223	$	(2,746,292	)	$	2,449,403

Following is the condensed consolidating balance sheet at December 31, 2011 (in thousands):

	Clean Harbors, Inc.		U.S. Guarantor Subsidiaries		Foreign Non-Guarantor Subsidiaries		Consolidating Adjustments			Total
Assets:
Cash and cash equivalents	$	91,581	$	128,071	$	41,071	$	—		$	260,723
Intercompany receivables	319,444		—		126,823		(446,267		)	—
Other current assets	43,687		324,607		262,851		—			631,145
Property, plant and equipment, net	—		392,566		511,381		—			903,947
Investments in subsidiaries	1,064,966		421,648		91,654		(1,578,268		)	—
Intercompany debt receivable	—		472,929		3,701		(476,630		)	—
Other long-term assets	13,228		111,104		165,656		—			289,988
Total assets	$	1,532,906	$	1,850,925	$	1,203,137	$	(2,501,165	)	$	2,085,803
Liabilities and Stockholders’ Equity:
Current liabilities	$	15,612	$	220,968	$	145,162	$	—		$	381,742
Intercompany payables	—		446,267		—		(446,267		)	—
Closure, post-closure and remedial liabilities, net	—		133,773		21,369		—			155,142
Long-term obligations	524,203		—		—		—			524,203
Capital lease obligations, net	—		475		5,900		—			6,375
Intercompany debt payable	3,701		—		472,929		(476,630		)	—
Other long-term liabilities	88,403		7,588		21,363		—			117,354
Total liabilities	631,919		809,071		666,723		(922,897		)	1,184,816
Stockholders’ equity	900,987		1,041,854		536,414		(1,578,268		)	900,987
Total liabilities and stockholders’ equity	$	1,532,906	$	1,850,925	$	1,203,137	$	(2,501,165	)	$	2,085,803

Following is the consolidating statement of income (loss) for the three months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	314,822		$	223,982		$	(4,998	)	$	533,806
Cost of revenues (exclusive of items shown separately below)	—			218,697			159,241			(4,998		)	372,940
Selling, general and administrative expenses	9			35,810			24,520			—			60,339
Accretion of environmental liabilities	—			2,150			338			—			2,488
Depreciation and amortization	—			20,778			20,522			—			41,300
Income from operations	(9		)	37,387			19,361			—			56,739
Other expense	—			(8		)	(83		)	—			(91		)
Loss on early extinguishment of debt	(26,385		)	—			—						(26,385		)
Interest (expense) income	(11,247		)	180			(529		)	—			(11,596		)
Equity in earnings of subsidiaries	50,039			15,869			—			(65,908		)	—
Intercompany dividend income (expense)	—			—			3,439			(3,439		)	—
Intercompany interest income (expense)	—			10,290			(10,290		)	—			—
Income before provision for income taxes	12,398			63,718			11,898			(69,347		)	18,667
Provision for income taxes	39			3,831			2,438			—			6,308
Net income	12,359			59,887			9,460			(69,347		)	12,359
Other comprehensive income (loss)	29,980			29,980			13,042			(43,022		)	29,980
Comprehensive income (loss)	$	42,339		$	89,867		$	22,502		$	(112,369	)	$	42,339

Following is the consolidating statement of income (loss) 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	(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 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	37,133			56,756			17,691			(74,447		)	37,133
Other comprehensive (loss) income	(58,144		)	(58,144		)	(20,839		)	78,983			(58,144		)
Comprehensive (loss) income	$	(21,011	)	$	(1,388	)	$	(3,148	)	$	4,536		$	(21,011	)

Following is the consolidating statement of income for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Consolidating Adjustments			Total
Revenues	$	—		$	920,101		$	724,532		$	(15,687	)	$	1,628,946
Cost of revenues (exclusive of items shown separately below)	—			630,652			525,913			(15,687		)	1,140,878
Selling, general and administrative expenses	27			122,167			75,698			—			197,892
Accretion of environmental liabilities	—			6,430			979			—			7,409
Depreciation and amortization	—			56,568			60,226			—			116,794
Income from operations	(27		)	104,284			61,716			—			165,973
Other expense	—			(333		)	(132		)	—			(465		)
Loss on early extinguishment of debt	(26,385		)	—			—			—			(26,385		)
Interest (expense) income	(32,679		)	—			(1,157		)	—			(33,836		)
Equity in earnings of subsidiaries	124,965			49,236			—			(174,201		)	—
Intercompany dividend income (expense)	10,010			—			10,354			(20,364		)	—
Intercompany interest income (expense)	—			30,894			(30,894		)	—			—
Income before provision for income taxes	75,884			184,081			39,887			(194,565		)	105,287
Provision for income taxes	8,084			19,473			9,930			—			37,487
Net income	67,800			164,608			29,957			(194,565		)	67,800
Other comprehensive income (loss)	27,703			27,703			11,370			(39,073		)	27,703
Comprehensive income (loss)	$	95,503		$	192,311		$	41,327		$	(233,638	)	$	95,503

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 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
Other comprehensive (loss) income	(38,537		)	(38,537		)	(15,044		)	53,581			(38,537		)
Comprehensive income (loss)	$	50,482		$	111,824		$	24,612		$	(136,436	)	$	50,482

Following is the condensed consolidating statement of cash flows for the nine months ended September 30, 2012 (in thousands):

	Clean Harbors, Inc.			U.S. Guarantor Subsidiaries			Foreign Non-Guarantor Subsidiaries			Total
Net cash from operating activities	$	(49,918	)	$	98,497		$	184,113		$	232,692
Cash flows from investing activities:
Additions to property, plant and equipment	—			(75,664		)	(54,662		)	(130,326		)
Proceeds from sales of fixed assets	—			3,411			779			4,190
Acquisitions, net of cash acquired	—			(51,424		)	(41,051		)	(92,475		)
Costs to obtain or renew permits	—			(625		)	(1,784		)	(2,409		)
Purchase of marketable securities	—			—			(10,517		)	(10,517		)
Other	—			603			4,517			5,120
Net cash from investing activities	—			(123,699		)	(102,718		)	(226,417		)
Cash flows from financing activities:
Change in uncashed checks	—			(7,771		)	(6,184		)	(13,955		)
Proceeds from exercise of stock options	231			—			—			231
Proceeds from employee stock purchase plan	4,627			—			—			4,627
Remittance of shares, net	(1,604		)	—			—			(1,604		)
Excess tax benefit of stock-based compensation	1,786			—			—			1,786
Deferred financing costs paid	(9,638		)	—			—			(9,638		)
Payments on capital leases	—			(781		)	(4,522		)	(5,303		)
Principal payment on debt	(520,000		)	—			—			(520,000		)
Issuance of senior unsecured notes	800,000			—			—			800,000
Distribution of cash earned on employee participation plan	(55		)	—			—			(55		)
Dividends (paid) / received	10,010			(23,669		)	13,659			—
Interest (payments) / received	—			43,954			(43,954		)	—
Net cash from financing activities	285,357			11,733			(41,001		)	256,089
Effect of exchange rate change on cash	—			—			527			527
Increase in cash and cash equivalents	235,439			(13,469		)	40,921			262,891
Cash and cash equivalents, beginning of period	91,581			128,071			41,071			260,723
Cash and cash equivalents, end of period	$	327,020		$	114,602		$	81,992		$	523,614

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		)
Proceeds from sale of fixed assets	—			545			5,380			5,925
Acquisitions, net of cash acquired	—			(50,166		)	(286,794		)	(336,960		)
Costs to obtain or renew permits	—			(486		)	(1,870		)	(2,356		)
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 of 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
Increase (decrease) 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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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Other Comprehensive Income [Abstract]
Change in fair value of available for sale securities, tax	$ 146	$ 33	$ 63	$ 211

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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable, Current	$ 11,103	$ 12,683
Accrued Capping, Closure, Post-closure and Environmental Costs	6,921	3,885
Accrued Environmental Loss Contingencies, Current	$ 12,631	$ 11,174
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	80,000,000	80,000,000
Common Stock, Shares, Issued	53,386,280	53,182,859
Common Stock, Shares, Outstanding	53,386,280	53,182,859

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REMEDIAL LIABILITIES

9 Months Ended

Sep. 30, 2012

Environmental Remediation Obligations [Abstract]

REMEDIAL LIABILITIES

REMEDIAL LIABILITIES

The changes to remedial liabilities for the nine months ended September 30, 2012 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, 2012	$	5,600		$	78,449		$	51,271		$	135,320
Accretion	206			2,585			1,663			4,454
Changes in estimates recorded to statement of income	(50		)	(846		)	(3,593		)	(4,489		)
Expenditures	(65		)	(3,488		)	(1,720		)	(5,273		)
Currency translation and other	99			4			497			600
Balance at September 30, 2012	$	5,790		$	76,704		$	48,118		$	130,612

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DOCUMENT AND ENTITY INFORMATION Document	9 Months Ended
	Sep. 30, 2012	Nov. 05, 2012
Document Information [Line Items]
Entity Registrant Name	CLEAN HARBORS INC
Entity Central Index Key	0000822818
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		53,426,174

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FINANCING ARRANGEMENTS

9 Months Ended

Sep. 30, 2012

Debt Disclosure [Abstract]

FINANCING ARRANGEMENTS

FINANCING ARRANGEMENTS

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

	September 30, 2012		December 31, 2011
Senior secured notes, at 7.625%, due August 15, 2016	$	—	$	520,000
Senior unsecured notes, at 5.25%, due August 1, 2020	800,000		—
Revolving credit facility, due May 31, 2016	—		—
Unamortized notes premium and discount, net	—		4,203
Long-term obligations	$	800,000	$	524,203

At September 30, 2012, the revolving credit facility had no outstanding loans, $163.4 million available to borrow and $86.6 million of letters of credit outstanding. There have been no changes to the revolving credit facility since December 31, 2011.

On July 13, 2012, the Company redeemed $30.0 million principal amount of the $520.0 million aggregate principal amount of the Company's 7.625% senior secured notes (“2016 Notes”) in accordance with the terms of the 2016 Notes. On July 16, 2012, the Company commenced a tender offer to purchase any and all of the $490.0 million aggregate principal amount of the then outstanding 2016 Notes following such partial redemption. On July 30, 2012, the Company purchased the $339.1 million principal amount of the 2016 Notes which had been tendered by July 27, 2012, and called for redemption on August 15, 2012 the $150.9 million principal amount of the 2016 Notes which had not been tendered. The Company financed that purchase and call for redemption of the 2016 Notes through a private placement of $800.0 million aggregate principal amount of 5.25% senior unsecured notes due 2020 (“New Notes”) which the Company also completed on July 30, 2012. The Company intends to use the $262.8 million of remaining net proceeds from such private placement of the New Notes to finance potential future acquisitions and for general corporate purposes. The Company is conducting an exchange offer for the unregistered New Notes originally issued for New Notes the Company registered under the Securities Act of 1933, as amended, pursuant to a registration statement which became effective in October 2012.

In connection with the tender offer and redemption of the 2016 Notes described above, the Company recorded an aggregate $26.4 million loss on early extinguishment of debt, which consisted of $21.1 million of purchase, consent and redemption fees and non-cash expenses of $5.3 million, of which $8.8 million related to unamortized financing costs offset partially by $3.5 million of unamortized net premium.

The principal terms of the New Notes are as follows:

The New Notes mature on August 1, 2020 and bear interest at a rate of 5.25% per annum, computed on the basis of a 360-day year composed of twelve 30-day months and payable semi-annually on August 1 and February 1 of each year, commencing on February 1, 2013.  The Company may redeem some or all of the New Notes at any time on or after August 1, 2016 upon not less than 30 nor more than 60 days' notice, at the following redemption prices (expressed as percentages of the principal amount) if redeemed during the twelve-month period commencing on August 1 of the year set forth below, plus, in each case, accrued and unpaid interest, if any, to the date of redemption: 

Year	Percentage
2016	102.625	%
2017	101.313	%
2018 and thereafter	100.000	%

At any time prior to August 1, 2015, the Company may also redeem up to 35% of the aggregate principal amount of all New Notes issued under the indenture (whether on July 30, 2012 or thereafter pursuant to an issuance of additional New Notes under the indenture) at a redemption price of 105.250% 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 New 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 New 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 New Notes and the related indenture contain various customary covenants and are guaranteed by substantially all the Company's current and future domestic restricted subsidiaries. The New Notes are the Company's and the guarantors' senior unsecured obligations ranking equally with the Company's and the guarantors' existing and future senior unsecured obligations and senior to any future indebtedness that is expressly subordinated to the New Notes and the guarantees. The New Notes and the guarantees rank effectively junior in right of payment to the Company's and the guarantors' secured indebtedness (including loans and reimbursement obligations in respect of outstanding letters of credit) under the Company's revolving credit facility and capital lease obligations to the extent of the value of the assets securing such secured indebtedness. The New Notes are not guaranteed by the Company's Canadian or other foreign subsidiaries, and the new notes will be structurally subordinated to all indebtedness and other liabilities, including trade payables, of the Company's subsidiaries that are not guarantors of the New Notes.

The financing arrangements and principal terms of the 2016 Notes and the revolving credit facility are discussed further in the Company’s Current Report on Form 8-K dated July 16, 2012.

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CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues	$ 533,806	$ 556,053	$ 1,628,946	$ 1,438,250
Cost of revenues (exclusive of items shown separately below)	372,940	386,518	1,140,878	1,006,849
Selling, general and administrative expenses	60,339	65,704	197,892	178,752
Accretion of environmental liabilities	2,488	2,435	7,409	7,231
Depreciation and amortization	41,300	34,604	116,794	87,000
Income from operations	56,739	66,792	165,973	158,418
Other (expense) income	(91)	164	(465)	5,931
Loss on early extinguishment of debt	(26,385)	0	(26,385)	0
Interest expense, net of interest income of $221 and $623, for the quarter and year-to-date ended 2012 and $153 and $700 for the quarter and year-to-date ended 2011, respectively	(11,596)	(10,927)	(33,836)	(28,047)
Income from continuing operations, before provision for income taxes	18,667	56,029	105,287	136,302
Provision for income taxes	6,308	18,896	37,487	47,283
Net Income	$ 12,359	$ 37,133	$ 67,800	$ 89,019
Earnings per share:
Basic (USD Per Share)	$ 0.23	$ 0.70	$ 1.27	$ 1.68
Diluted (USD Per Share)	$ 0.23	$ 0.70	$ 1.27	$ 1.67
Weighted average common shares outstanding - basic (In Shares)	53,374	53,023	53,303	52,921
Weighted average common shares outstanding - diluted (In Shares)	53,565	53,370	53,519	53,298

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BUSINESS COMBINATIONS

9 Months Ended

Sep. 30, 2012

Business Combinations [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

Acquisitions during 2012

The Company acquired during the second quarter of 2012 all of the outstanding stock of a privately owned Canadian company which provides workforce accommodations, camp catering and fresh food services and during the third quarter of 2012 certain assets of a privately owned U.S. company that is engaged in the business of materials handling services that includes a variety of support equipment to provide customers with a sole source for any dredging and dewatering project. The combined purchase price for these acquisitions were approximately $83.7 million, including the assumption and payment of debt of $7.7 million, and post-closing adjustments of $3.9 million based upon the assumed target amounts of working capital. 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. 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 dates. Final determination of the fair value may result in further adjustments to the values presented below (in thousands).

	At Acquisition Dates (As reported at September 30, 2012)
Current assets (i)	$13,964
Property, plant and equipment	35,882
Customer relationships and other intangibles	17,690
Current liabilities	(4,022	)
Other liabilities	(3,388	)
Total identifiable net assets	60,126
Goodwill (ii)	23,574
Total	$83,700

_______________________

(i) The preliminary fair value of the financial assets acquired includes customer receivables with an aggregate fair value of $7.3 million. Combined gross amounts due were $7.5 million.  

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial Services segment and will not be deductible for tax purposes.

Acquisition related costs included in selling, general and administrative expenses in the Company's consolidated statements of income for the three and nine months ended September 30, 2012 were immaterial.

The following unaudited pro forma combined summary data presents information as if the 2012 acquisitions had been acquired at the beginning of 2011 and assumes that there were no material, non-recurring pro forma adjustments 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 two acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012	September 30, 2011	September 30, 2012	September 30, 2011
Pro forma combined revenues	$534,770	$568,427	$1,666,377	$1,477,304
Pro forma combined net income	$12,465	$38,616	$73,799	$93,524

Acquisitions during the third quarter of 2011

During the three months 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 $142.1 million, including the assumption and payment of debt of $25.2 million, and post-closing adjustments of $4.5 million based upon the assumed target amounts of working capital.     

During the three months ended September 30, 2012, the Company finalized the purchase accounting of the identified acquired assets and liabilities, including the completion of the intangible assets, current liabilities and remedial liability valuations. The following table summarizes the recognized amounts of identifiable assets acquired and liabilities assumed (in thousands).

	At Acquisition Dates (As reported at June 30, 2012)			Measurement Period Adjustments			At Acquisition Dates (As Adjusted)
Current assets (i)	$	41,491		$	60		$	41,551
Property, plant and equipment	62,969			—			62,969
Customer relationships and other intangibles	23,371			—			23,371
Other assets	1,671			—			1,671
Current liabilities	(23,403		)	255			(23,148		)
Asset retirement obligations and remedial liabilities	(200		)	—			(200		)
Other liabilities	(2,419		)	—			(2,419		)
Total identifiable net assets	103,480			315			103,795
Goodwill (ii)	38,654			(315		)	38,339
Total	$	142,134		$	—		$	142,134

_______________________

(i) The fair value of the financial assets acquired includes customer receivables with an 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 $13.3 million, $11.1 million and $13.9 million has been assigned to the Oil and Gas Field Services segment, the Technical Services segment, and the Industrial Services segment, respectively, and will not be deductible for tax purposes.

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 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 June 30, 2012, the Company finalized the purchase accounting for the acquisition of Peak. The following table summarizes the amounts of identifiable assets acquired and liabilities assumed at June 10, 2011 (in thousands).

	At June 10, 2011 (As adjusted)
Current assets (i)	$	45,222
Property, plant and equipment	151,574
Identifiable intangible assets	12,337
Other assets	8,009
Current liabilities	(28,785		)
Asset retirement obligations	(103		)
Other liabilities	(11,341		)
Total identifiable net assets	176,913
Goodwill (ii)	28,220
Total	$	205,133

_______________________

(i) The fair value of the financial assets acquired includes customer receivables with a 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 $12.9 million and $15.3 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectively.

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SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 2012

Accounting Policies [Abstract]

SIGNIFICANT ACCOUNTING POLICIES

RECENT ACCOUNTING PRONOUNCEMENTS

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 required a change in the presentation of the financial statements and required retrospective application. In December 2011, the FASB deferred certain provisions of the ASU that relate to presentation of reclassification adjustments. The Company retrospectively adopted this guidance utilizing two separate but consecutive statements to report the components of other comprehensive income, and recast the financial statements for the years ending 2011, 2010 and 2009 in the Company's Current Report on Form 8-K filed on July 16, 2012. This standard had no impact on the Company's financial position, results of operations or cash flows.

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SEGMENT REPORTING

9 Months Ended

Sep. 30, 2012

Segment Reporting [Abstract]

SEGMENT REPORTING

SEGMENT REPORTING

During the quarter ended March 31, 2012, the Company re-assigned certain departments among its segments to support management reporting changes. Accordingly, the Company re-allocated shared departmental costs among its segments. The Company has recast the prior year segment information to conform to the current year presentation.

The Company’s operations are managed in four reportable segments: Technical Services, Field Services, Industrial Services and Oil and Gas Field Services. 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 is other expense (income) and loss on early extinguishment of debt 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 months ended September 30, 2012 and 2011 (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, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	236,605	$	60,194		$	149,120		$	87,619	$	268		$	533,806
Intersegment revenues, net	5,501		(2,531		)	(4,599		)	2,296		(667		)	—
Direct revenues	$	242,106	$	57,663		$	144,521		$	89,915	$	(399	)	$	533,806

	For the Three Months Ended September 30, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services			Corporate Items			Totals
Third party revenues	$	221,424	$	105,181		$	123,639		$	105,546		$	263		$	556,053
Intersegment revenues, net	6,934		(5,661		)	(171		)	(532		)	(570		)	—
Direct revenues	$	228,358	$	99,520		$	123,468		$	105,014		$	(307	)	$	556,053

	For the Nine Months Ended September 30, 2012
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	676,074	$	174,557		$	458,858		$	318,158	$	1,299		$	1,628,946
Intersegment revenues, net	22,779		(10,309		)	(19,970		)	8,962		(1,462		)	—
Direct revenues	$	698,853	$	164,248		$	438,888		$	327,120	$	(163	)	$	1,628,946

	For the Nine Months Ended September 30, 2011
	Technical Services		Field Services			Industrial Services			Oil and Gas Field Services		Corporate Items			Totals
Third party revenues	$	633,187	$	216,377		$	351,534		$	236,553	$	599		$	1,438,250
Intersegment revenues, net	17,181		(13,279		)	(7,217		)	4,859		(1,544		)	—
Direct revenues	$	650,368	$	203,098		$	344,317		$	241,412	$	(945	)	$	1,438,250

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, other expense (income), and loss on early extinguishment of debt to its segments.

	For the Three Months Ended						For the Nine Months Ended
	September 30,						September 30,
	2012			2011			2012			2011
Adjusted EBITDA:
Technical Services	$	67,332		$	62,531		$	184,874		$	174,033
Field Services	5,707			19,318			15,599			31,527
Industrial Services	37,860			25,933			107,452			77,630
Oil and Gas Field Services	14,752			25,062			60,961			45,748
Corporate Items	(25,124		)	(29,013		)	(78,710		)	(76,289		)
Total	$	100,527		$	103,831		$	290,176		$	252,649
Reconciliation to Consolidated Statements of Income:
Accretion of environmental liabilities	$	2,488		$	2,435		$	7,409		$	7,231
Depreciation and amortization	41,300			34,604			116,794			87,000
Income from operations	56,739			66,792			165,973			158,418
Other expense (income)	91			(164		)	465			(5,931		)
Loss on early extinguishment of debt	26,385			—			26,385			—
Interest expense, net of interest income	11,596			10,927			33,836			28,047
Income before provision for income taxes	$	18,667		$	56,029		$	105,287		$	136,302

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

	September 30, 2012		December 31, 2011
Property, plant and equipment, net
Technical Services	$	323,159	$	308,118
Field Services	35,323		30,296
Industrial Services	301,748		254,469
Oil and Gas Field Services	278,245		267,987
Corporate Items	64,939		43,077
Total property, plant and equipment, net	$	1,003,414	$	903,947
Intangible assets:
Technical Services
Goodwill	$	45,473	$	44,410
Permits and other intangibles, net	79,615		81,605
Total Technical Services	125,088		126,015
Field Services
Goodwill	2,232		2,232
Permits and other intangibles, net	3,140		1,204
Total Field Services	5,372		3,436
Industrial Services
Goodwill	69,870		45,444
Permits and other intangibles, net	34,537		19,701
Total Industrial Services	104,407		65,145
Oil and Gas Field Services
Goodwill	40,149		30,306
Permits and other intangibles, net	34,518		37,134
Total Oil and Gas Field Services	74,667		67,440
Total	$	309,534	$	262,036

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

	September 30, 2012		December 31, 2011
Technical Services	$	619,868	$	604,904
Field Services	47,001		37,850
Industrial Services	445,048		345,202
Oil and Gas Field Services	377,938		429,938
Corporate Items	959,548		667,909
Total	$	2,449,403	$	2,085,803

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

	September 30, 2012		December 31, 2011
United States	$	1,427,861	$	1,119,491
Canada	1,021,542		961,936
Other foreign	—		4,376
Total	$	2,449,403	$	2,085,803

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INCOME TAXES

9 Months Ended

Sep. 30, 2012

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

The Company’s effective tax rate for the three and nine months ended September 30, 2012 was 33.8% and 35.6%, respectively, compared to 33.7% and 34.7% for the same period in 2011.

As of September 30, 2012, the Company had recorded $36.2 million of liabilities for unrecognized tax benefits and $28.8 million of interest and penalties. As of December 31, 2011, the Company had recorded $36.2 million of liabilities for unrecognized tax benefits and $26.8 million of interest and penalties.

The Company believes that it is reasonably possible that total unrecognized tax benefits and related reserves will decrease by approximately $63.8 million within the next twelve months as a result of the lapse of the statute of limitations. The $63.8 million (which includes interest and penalties of $28.6 million) is primarily related to a historical Canadian debt restructuring transaction and, if realized, will be recorded in earnings and therefore will impact the effective income tax rate.

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ACCRUED EXPENSES

9 Months Ended

Sep. 30, 2012

Accrued Expenses [ABSTRACT]

ACCRUED EXPENSES

ACCRUED EXPENSES

Accrued expenses consisted of the following (in thousands):

	September 30, 2012		December 31, 2011
Insurance	$	22,602	$	21,712
Interest	7,605		15,434
Accrued disposal costs	1,796		2,455
Accrued compensation and benefits	41,885		56,029
Income, real estate, sales and other taxes	24,568		14,863
Other	38,231		37,499
	$	136,687	$	147,992

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FAIR VALUE MEASUREMENTS

9 Months Ended

Sep. 30, 2012

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, trade payables and accrued liabilities approximate their carrying value due to the short maturity of these instruments. The carrying value of the cash equivalents and accrued liabilities is Level 2 in the fair value hierarchy. The fair value of the Company’s senior notes at September 30, 2012 was $820.9 million is based on available market data and at December 31, 2011 was $538.5 million is based on quoted market prices. The senior unsecured notes fair value is Level 2 in the fair value hierarchy.

As of September 30, 2012 and December 31, 2011, the Company's assets measured at fair value on a recurring basis were as follows (in thousands):

September 30, 2012
	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, 2012
Auction rate securities	$	—	$	—	$	4,326	$	4,326
Marketable securities	$	11,113	$	—	$	—	$	11,113

December 31, 2011
	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, 2011
Auction rate securities	$	—	$	—	$	4,245	$	4,245
Marketable securities	$	111	$	—	$	—	$	111

The fair value of marketable securities is recorded based on quoted market prices and changes in fair value were included in accumulated other comprehensive income. During the nine months ended September 30, 2012 and 2011, the Company recorded an unrealized pre-tax gain of $0.1 million and an unrealized pre-tax loss of $0.2 million, respectively, on its auction rate securities, which was included in accumulated other comprehensive income.  

The auction rate securities are classified as available for sale and the fair value of these securities as of September 30, 2012 was estimated utilizing a probability discounted cash flow analysis. As of September 30, 2012, all of the Company's auction rate securities continue to have AAA underlying ratings. The Company attributes the $0.4 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.

The following table presents 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, 2012 and 2011 (in thousands):

	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2012		2011			2012		2011
Balance at beginning of period	$	4,326	$	5,311		$	4,245	$	5,437
Sale of auction rate securities	—		(1,000		)	—		(1,000		)
Unrealized gains (losses) included in other comprehensive income	—		(72		)	81		(198		)
Balance at September 30,	$	4,326	$	4,239		$	4,326	$	4,239

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GOODWILL AND OTHER INTANGIBLE ASSETS

9 Months Ended

Sep. 30, 2012

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, 2012 were as follows (in thousands):

	2012
Balance at January 1, 2012	$	122,392
Acquired from acquisitions	27,449
Increase from adjustments related to the acquisitions during the measurement period	5,037
Currency translation	2,846
Balance at September 30, 2012	$	157,724

The Company evaluates goodwill for impairment on an annual basis at the reporting unit level on the last day of each fiscal year and more frequently if events occur or circumstances change which suggests that the goodwill should be evaluated. The Company performed its annual impairment tests using an income approach. As of September 30, 2012, the Company assessed the performance of its Oil and Gas Field Services reporting unit due to its lower than anticipated financial results and concluded the fair value of the reporting unit more likely than not exceeds the carrying value. The Company will continue to assess this reporting unit's performance.

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

	September 30, 2012							December 31, 2011
	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)	Cost		Accumulated Amortization		Net		Weighted Average Amortization Period (in years)
Permits	$	114,910	$	48,907	$	66,003	17.8	$	106,939	$	45,629	$	61,310	17.9
Customer relationships	98,613		25,113		73,500		7.0	83,721		17,650		66,071		7.9
Other intangible assets	23,764		11,457		12,307		3.5	21,528		9,265		12,263		5.3
	$	237,287	$	85,477	$	151,810	8.9	$	212,188	$	72,544	$	139,644	10.0

The aggregate amortization expense for the three and nine months ended September 30, 2012 was $4.4 million and $11.8 million, respectively. The aggregate amortization expense for the three and nine months ended September 30, 2011 was $3.2 million and $8.7 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 for the recent acquisitions assigned to customer relationships and other intangible assets are $12.8 million and $0.6 million, respectively, and the weighted amortization period for customer relationships and other intangible assets are 7.6 years and 2.8 years, respectively.

Below is the expected future amortization for the net carrying amount of finite lived intangible assets at September 30, 2012 (in thousands):

Years Ending December 31,	Expected Amortization
2012 (three months)	$	4,146
2013	15,485
2014	15,007
2015	14,150
2016	13,478
Thereafter	83,749
	$	146,015

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CLOSURE AND POST-CLOSURE LIABILITIES

9 Months Ended

Sep. 30, 2012

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, 2012 were as follows (in thousands):

	Landfill Retirement Liability			Non-Landfill Retirement Liability			Total
Balance at January 1, 2012	$	25,764		$	9,117		$	34,881
New asset retirement obligations	2,292			—			2,292
Accretion	2,145			810			2,955
Changes in estimates recorded to statement of income	490			446			936
Other changes in estimates recorded to balance sheet	(2,058		)	15			(2,043		)
Expenditures	(1,995		)	(565		)	(2,560		)
Currency translation and other	120			52			172
Balance at September 30, 2012	$	26,758		$	9,875		$	36,633

All of the landfill facilities included in the above were active as of September 30, 2012. New asset retirement obligations incurred in the period January through July 2012 were discounted at the credit-adjusted risk-free rate of 8.56%. Subsequent to the Company's $800.0 million senior unsecured notes offering which was completed on July 30, 2012, the Company recalculated its credit-adjusted risk-free rate. Beginning in August 2012, new asset retirement obligations will be discounted at the rate of 6.66%.

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EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 30, 2012

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,
	2012		2011		2012		2011
Numerator for basic and diluted earnings per share:
Net Income	$	12,359	$	37,133	$	67,800	$	89,019
Denominator:
Basic shares outstanding	53,374		53,023		53,303		52,921
Dilutive effect of equity-based compensation awards	191		347		216		377
Dilutive shares outstanding	53,565		53,370		53,519		53,298
Basic earnings per share:	$	0.23	$	0.70	$	1.27	$	1.68
Diluted earnings per share:	$	0.23	$	0.70	$	1.27	$	1.67

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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, 2012	Sep. 30, 2012
Awards granted
Shares	34,886	179,272
Restricted stock awards
Awards granted
Shares	33,494	108,761
Weighted-Average Grant-Date Fair Value (in dollars per share)	53.41	60.49
Performance stock awards
Awards granted
Shares	1,392	70,511
Weighted-Average Grant-Date Fair Value (in dollars per share)	53.41	66.98
Performance Goals	3

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STOCK-BASED COMPENSATION

9 Months Ended

Sep. 30, 2012

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 months ended September 30, 2012, as well as the related weighted-average grant-date fair values:

	Three Months Ended			Nine Months Ended
	September 30, 2012			September 30, 2012
	Shares	Weighted Average Grant-Date Fair Value		Shares	Weighted Average Grant-Date Fair Value
Restricted stock awards	33,494	$	53.41	108,761	$	60.49
Performance stock awards	1,392	$	53.41	70,511	$	66.98
Total awards	34,886			179,272

Certain performance stock awards granted in March 2012, June 2012 and September 2012 are subject to achieving three performance goals including predetermined revenue, EBITDA and total reportable incident rate targets for a specified period of time as well as service conditions.  As of September 30, 2012, based on year-to-date results of operations, management has not determined that it is probable that the performance targets for the 2012 performance awards will be achieved by December 31, 2013. As a result, the Company recognized no expense during the three and nine months ended September 30, 2012 related to the 2012 performance stock awards.

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SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2012

Accounting Policies [Abstract]

New Accounting Pronouncements, Policy

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 required a change in the presentation of the financial statements and required retrospective application. In December 2011, the FASB deferred certain provisions of the ASU that relate to presentation of reclassification adjustments. The Company retrospectively adopted this guidance utilizing two separate but consecutive statements to report the components of other comprehensive income, and recast the financial statements for the years ending 2011, 2010 and 2009 in the Company's Current Report on Form 8-K filed on July 16, 2012. This standard had no impact on the Company's financial position, results of operations or cash flows.

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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Numerator for basic and diluted earnings per share:
Net Income	$ 12,359	$ 37,133	$ 67,800	$ 89,019
Denominator:
Basic shares outstanding	53,374	53,023	53,303	52,921
Dilutive effect of equity-based compensation awards	191	347	216	377
Dilutive shares outstanding	53,565	53,370	53,519	53,298
Basic earnings per share:
Basic earnings per share: (USD Per Share)	$ 0.23	$ 0.70	$ 1.27	$ 1.68
Diluted earnings per share:
Diluted earnings per share: (USD Per Share)	$ 0.23	$ 0.70	$ 1.27	$ 1.67

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GOODWILL AND INTANGIBLE ASSETS DISCLOSURE (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Goodwill [Roll Forward]
Balance at January 1, 2012	$ 122,392
Acquired from acquisitions	27,449
Increase from adjustments related to the acquisitions during the measurement period	5,037
Currency translation	2,846
Balance at June 30, 2012	$ 157,724

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CONDENSED CONSOLIDATED STATEMENS OF INCOME (PARENTHETICAL) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Interest, Income	$ 221	$ 153	$ 623	$ 700

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BASIS OF PRESENTATION

9 Months Ended

Sep. 30, 2012

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 16, 2012.

During the three months ended March 31, 2012, the Company re-assigned certain departments among its segments to support management reporting changes. Accordingly, the Company re-allocated shared departmental costs among its segments. The Company has recast the prior year segment information to conform to the current year presentation. See Note 14, “Segment Reporting.”

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BUSINESS COMBINATIONS (Tables)

9 Months Ended

Sep. 30, 2012

Acquisitions During 2012 [Member]

Business Acquisition [Line Items]

Business Acquisition, Pro Forma Combined Information

The following unaudited pro forma combined summary data presents information as if the 2012 acquisitions had been acquired at the beginning of 2011 and assumes that there were no material, non-recurring pro forma adjustments 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 two acquisitions been combined during the periods presented, nor is it necessarily indicative of the future results of operations of the combined companies (in thousands).

	For the Three Months Ended		For the Nine Months Ended
	September 30, 2012	September 30, 2011	September 30, 2012	September 30, 2011
Pro forma combined revenues	$534,770	$568,427	$1,666,377	$1,477,304
Pro forma combined net income	$12,465	$38,616	$73,799	$93,524

Summary of recognized amounts of identifiable assets acquired and liabilities assumed

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 dates. Final determination of the fair value may result in further adjustments to the values presented below (in thousands).

	At Acquisition Dates (As reported at September 30, 2012)
Current assets (i)	$13,964
Property, plant and equipment	35,882
Customer relationships and other intangibles	17,690
Current liabilities	(4,022	)
Other liabilities	(3,388	)
Total identifiable net assets	60,126
Goodwill (ii)	23,574
Total	$83,700

_______________________

(i) The preliminary fair value of the financial assets acquired includes customer receivables with an aggregate fair value of $7.3 million. Combined gross amounts due were $7.5 million.  

(ii) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial Services segment and will not be deductible for tax purposes.

Acquisitions During 2011 [Member]

Business Acquisition [Line Items]

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).

	At Acquisition Dates (As reported at June 30, 2012)			Measurement Period Adjustments			At Acquisition Dates (As Adjusted)
Current assets (i)	$	41,491		$	60		$	41,551
Property, plant and equipment	62,969			—			62,969
Customer relationships and other intangibles	23,371			—			23,371
Other assets	1,671			—			1,671
Current liabilities	(23,403		)	255			(23,148		)
Asset retirement obligations and remedial liabilities	(200		)	—			(200		)
Other liabilities	(2,419		)	—			(2,419		)
Total identifiable net assets	103,480			315			103,795
Goodwill (ii)	38,654			(315		)	38,339
Total	$	142,134		$	—		$	142,134

_______________________

(i) The fair value of the financial assets acquired includes customer receivables with an 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 $13.3 million, $11.1 million and $13.9 million has been assigned to the Oil and Gas Field Services segment, the Technical Services segment, and the Industrial Services segment, respectively, and will not be deductible for tax purposes.

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

Business Acquisition [Line Items]

Summary of recognized amounts of identifiable assets acquired and liabilities assumed

During the three months ended June 30, 2012, the Company finalized the purchase accounting for the acquisition of Peak. The following table summarizes the amounts of identifiable assets acquired and liabilities assumed at June 10, 2011 (in thousands).

	At June 10, 2011 (As adjusted)
Current assets (i)	$	45,222
Property, plant and equipment	151,574
Identifiable intangible assets	12,337
Other assets	8,009
Current liabilities	(28,785		)
Asset retirement obligations	(103		)
Other liabilities	(11,341		)
Total identifiable net assets	176,913
Goodwill (ii)	28,220
Total	$	205,133

_______________________

(i) The fair value of the financial assets acquired includes customer receivables with a 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 $12.9 million and $15.3 million has been recorded in the Oil and Gas Field Services and Industrial Services segments, respectively.

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BUSINESS COMBINATIONS Business Combinations - 2012 (Details) (USD $)			3 Months Ended			9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Privately Owned U.S. Company		Sep. 30, 2011 Privately Owned U.S. Company	Sep. 30, 2012 Privately Owned U.S. Company		Sep. 30, 2011 Privately Owned U.S. Company
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			$ 83,700,000			$ 83,700,000
Payment of debt			7,700,000			7,700,000
Post-closing adjustments			3,900,000			3,900,000
Purchase Price Allocation
Current assets			13,964,000			13,964,000
Property, plant, and equipment			35,882,000			35,882,000
Customer relationships and other intangibles			17,690,000			17,690,000
Current liabilities			4,022,000			4,022,000
Other liabilities			3,388,000			3,388,000
Total identifiable net assets			60,126,000			60,126,000
Goodwill	157,724,000	122,392,000	23,574,000	[1]		23,574,000	[1]
Total			83,700,000			83,700,000
Preliminary fair value			7,300,000			7,300,000
Combines gross amounts			7,500,000			7,500,000
Business Acquisition, Pro Forma Information [Abstract]
Pro forma combined revenues			534,770,000		568,427,000	1,666,377,000		1,477,304,000
Pro forma combined net			$ 12,465,000		$ 38,616,000	$ 73,799,000		$ 93,524,000

[1] Goodwill represents the excess of the fair value of the net assets acquired over the purchase price attributed to expected operating and cross selling synergies. The goodwill has been assigned to the Industrial Services segment and will not be deductible for tax purposes.

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EARNINGS PER SHARE

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHARE

The Company computed basic earnings per share, or EPS, for the three and nine months ended September 30, 2012 using the weighted average number of shares outstanding during the periods. For the three and nine months ended September 30, 2012, the dilutive effect of all then outstanding options, restricted stock and performance awards is included in the EPS calculations below except for 66,000 outstanding performance stock awards for which the performance criteria were not attained at that time. For the three and nine months ended September 30, 2011, the EPS calculations below include the dilutive effects of all then outstanding options, restricted stock, and performance awards except for 73,000 outstanding performance stock awards for which the performance criteria were not attained at that time.

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,
	2012		2011		2012		2011
Numerator for basic and diluted earnings per share:
Net Income	$	12,359	$	37,133	$	67,800	$	89,019
Denominator:
Basic shares outstanding	53,374		53,023		53,303		52,921
Dilutive effect of equity-based compensation awards	191		347		216		377
Dilutive shares outstanding	53,565		53,370		53,519		53,298
Basic earnings per share:	$	0.23	$	0.70	$	1.27	$	1.68
Diluted earnings per share:	$	0.23	$	0.70	$	1.27	$	1.67