
	Three Months Ended March 31, 2018
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	72,301	$	2,737	$	75,038
Services Revenue:
Transportation and Logistics (2)		14,170		5,697		19,867
Industrial Cleaning (3)		—		3,505		3,505
Technical Services (4)		—		20,405		20,405
Remediation (5)		—		353		353
Other (6)		—		891		891
Revenue	$	86,471	$	33,588	$	120,059


	Three Months Ended March 31, 2017
			Field &
	Environmental		Industrial
$s in thousands	Services		Services		Total
Treatment & Disposal Revenue (1)	$	68,703	$	2,637	$	71,340
Services Revenue:
Transportation and Logistics (2)		12,600		5,320		17,920
Industrial Cleaning (3)		—		4,219		4,219
Technical Services (4)		—		15,662		15,662
Remediation (5)		—		606		606
Other (6)		—		487		487
Revenue	$	81,303	$	28,931	$	110,234

(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 March 31, 2018 and 2017, approximately 17% and 16%, respectively, of our treatment and disposal revenue was derived from Event Business projects. Base Business revenue was approximately 83% and 84% of our treatment and disposal revenue for the three months ended March 31, 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 March 31, 2018						Three Months Ended March 31, 2017
			Field &						Field &
	Environmental		Industrial				Environmental		Industrial
$s in thousands	Services		Services		Total		Services		Services		Total
United States	$	74,986	$	33,588	$	108,574	$	67,261	$	28,931	$	96,192
Canada		11,485		—		11,485		14,042		—		14,042
Total revenue	$	86,471	$	33,588	$	120,059	$	81,303	$	28,931	$	110,234