
	Three Months Ended September 30, 2018
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	82,663	$	3,556	$	86,219
Services Revenue:
Transportation and Logistics (2)		24,534		9,345		33,879
Industrial Cleaning (3)		—		5,691		5,691
Technical Services (4)		—		14,185		14,185
Remediation (5)		—		6,776		6,776
Other (6)		—		4,666		4,666
Revenue	$	107,197	$	44,219	$	151,416


	Three Months Ended September 30, 2017
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	77,071	$	2,595	$	79,666
Services Revenue:
Transportation and Logistics (2)		20,590		4,955		25,545
Industrial Cleaning (3)		—		4,328		4,328
Technical Services (4)		—		20,314		20,314
Remediation (5)		—		2,672		2,672
Other (6)		—		1,529		1,529
Revenue	$	97,661	$	36,393	$	134,054


	Nine Months Ended September 30, 2018
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	232,942	$	9,459	$	242,401
Services Revenue:
Transportation and Logistics (2)		59,686		22,593		82,279
Industrial Cleaning (3)		—		13,353		13,353
Technical Services (4)		—		55,370		55,370
Remediation (5)		—		8,454		8,454
Other (6)		—		6,530		6,530
Revenue	$	292,628	$	115,759	$	408,387


	Nine Months Ended September 30, 2017
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	217,012	$	8,133	$	225,145
Services Revenue:
Transportation and Logistics (2)		51,543		15,218		66,761
Industrial Cleaning (3)		—		13,252		13,252
Technical Services (4)		—		55,778		55,778
Remediation (5)		—		6,495		6,495
Other (6)		—		2,914		2,914
Revenue	$	268,555	$	101,790	$	370,345

(1)

We categorize our treatment and disposal revenue as either “Base Business” or “Event Business” based on the underlying nature of the revenue source. We define Event Business as non-recurring projects that are expected to equal or exceed 1,000 tons, with Base Business defined as all other business not meeting the definition of Event Business. For the three months ended September 30, 2018 and 2017, 22% and 26%, respectively, of our treatment and disposal revenue was derived from Event Business projects. Base Business revenue accounted for 78% and 74% of our treatment and disposal revenue for the three months ended September 30, 2018 and 2017, respectively. For the nine months ended September 30, 2018 and 2017, 20% and 22%, respectively, of our treatment and disposal revenue was derived from Event Business projects. Base Business revenue accounted for 80% and 78% of our treatment and disposal revenue for the nine months ended September 30, 2018 and 2017, respectively.

(2)

Includes such services as collection and transportation of non-hazardous and hazardous waste.

(3)

Includes such services as industrial cleaning and maintenance for refineries, chemical plants, steel and automotive plants, and refinery services such as tank cleaning and temporary storage.

(4)

Includes such services as total waste management programs, retail services, laboratory packing, less-than-truck-load service and household hazardous waste collection. Contracts for Technical Services may extend beyond one year and a portion of the transactions price can be fixed.

(5)

Includes such services as site assessment, onsite treatment, project management and remedial action planning and execution. Contracts for Remediation may extend beyond one year and a portion of the transaction price can be fixed.

(6)

Includes such services as emergency response and marine.

We provide services in the United States and Canada. The following table presents our revenue disaggregated by our reportable segments and geographic location where the underlying services were performed:


	Three Months Ended September 30, 2018						Three Months Ended September 30, 2017
			Field &						Field &
	Environmental		Industrial				Environmental		Industrial
$s in thousands	Services		Services		Total		Services		Services		Total
United States	$	85,183	$	44,219	$	129,402	$	76,428	$	36,393	$	112,821
Canada		22,014		—		22,014		21,233		—		21,233
Total revenue	$	107,197	$	44,219	$	151,416	$	97,661	$	36,393	$	134,054


	Nine Months Ended September 30, 2018						Nine Months Ended September 30, 2017
			Field &						Field &
	Environmental		Industrial				Environmental		Industrial
$s in thousands	Services		Services		Total		Services		Services		Total
United States	$	245,086	$	115,759	$	360,845	$	217,986	$	101,790	$	319,776
Canada		47,542		—		47,542		50,569		—		50,569
Total revenue	$	292,628	$	115,759	$	408,387	$	268,555	$	101,790	$	370,345