
	Three Months Ended June 30, 2018
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	77,978	$	3,166	$	81,144
Services Revenue:
Transportation and Logistics (2)		20,982		7,551		28,533
Industrial Cleaning (3)		—		4,157		4,157
Technical Services (4)		—		20,780		20,780
Remediation (5)		—		1,325		1,325
Other (6)		—		973		973
Revenue	$	98,960	$	37,952	$	136,912


	Three Months Ended June 30, 2017
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	71,238	$	2,901	$	74,139
Services Revenue:
Transportation and Logistics (2)		18,353		4,943		23,296
Industrial Cleaning (3)		—		4,705		4,705
Technical Services (4)		—		19,802		19,802
Remediation (5)		—		3,217		3,217
Other (6)		—		898		898
Revenue	$	89,591	$	36,466	$	126,057


	Six Months Ended June 30, 2018
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	150,279	$	5,903	$	156,182
Services Revenue:
Transportation and Logistics (2)		35,152		13,248		48,400
Industrial Cleaning (3)		—		7,662		7,662
Technical Services (4)		—		41,185		41,185
Remediation (5)		—		1,678		1,678
Other (6)		—		1,864		1,864
Revenue	$	185,431	$	71,540	$	256,971


	Six Months Ended June 30, 2017
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	139,941	$	5,538	$	145,479
Services Revenue:
Transportation and Logistics (2)		30,953		10,263		41,216
Industrial Cleaning (3)		—		8,924		8,924
Technical Services (4)		—		35,464		35,464
Remediation (5)		—		3,823		3,823
Other (6)		—		1,385		1,385
Revenue	$	170,894	$	65,397	$	236,291

(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 June 30, 2018 and 2017, 19% and 23%, respectively, of our treatment and disposal revenue was derived from Event Business projects. Base Business revenue accounted for 81% and 77% of our treatment and disposal revenue for the three months ended June 30, 2018 and 2017, respectively. For the six months ended June 30, 2018 and 2017, 18% and 19%, respectively, of our treatment and disposal revenue was derived from Event Business projects. Base Business revenue accounted for 82% and 81% of our treatment and disposal revenue for the six months ended June 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 June 30, 2018						Three Months Ended June 30, 2017
			Field &						Field &
	Environmental		Industrial				Environmental		Industrial
$s in thousands	Services		Services		Total		Services		Services		Total
United States	$	84,917	$	37,952	$	122,869	$	74,297	$	36,466	$	110,763
Canada		14,043		—		14,043		15,294		—		15,294
Total revenue	$	98,960	$	37,952	$	136,912	$	89,591	$	36,466	$	126,057


	Six Months Ended June 30, 2018						Six Months Ended June 30, 2017
			Field &						Field &
	Environmental		Industrial				Environmental		Industrial
$s in thousands	Services		Services		Total		Services		Services		Total
United States	$	159,903	$	71,540	$	231,443	$	141,558	$	65,397	$	206,955
Canada		25,528		—		25,528		29,336		—		29,336
Total revenue	$	185,431	$	71,540	$	256,971	$	170,894	$	65,397	$	236,291