EXHIBIT 99.1

Full Year 2020 by Quarter and Full Year 2019 Unaudited Segment Information

The following table sets forth certain financial information associated with our results of operations (unaudited, in thousands):

			Summary of Operations
			For the Three Months Ended																								For the Twelve Months Ended
			March 31, 2020						June 30, 2020						September 30, 2020						December 31, 2020						December 31, 2020						December 31, 2019
Direct Revenues(1):
Environmental Services			$	705,192					$	612,594					$	650,560					$	667,555					$	2,635,901					$	2,795,994
Safety-Kleen Sustainability Solutions			153,281						97,350						128,712						128,563						507,906						615,060
Corporate Items			90						56						72						72						290						1,136
Total			858,563						710,000						779,344						796,190						3,144,097						3,412,190
Cost of Revenues(2):
Environmental Services			491,121						385,113						416,539						446,342						1,739,115						1,934,556
Safety-Kleen Sustainability Solutions			113,828						76,318						87,924						96,802						374,872						430,746
Corporate Items			1,717						9,250						7,166						5,631						23,764						22,517
Total			606,666						470,681						511,629						548,775						2,137,751						2,387,819
Selling, General and Administrative Expenses:
Environmental Services			68,213						51,240						54,019						57,396						230,868						261,025
Safety-Kleen Sustainability Solutions			15,249						12,601						11,175						10,795						49,820						56,065
Corporate Items			45,845						39,998						41,350						43,163						170,356						166,964
Total			129,307						103,839						106,544						111,354						451,044						484,054
Adjusted EBITDA
Environmental Services			145,858						176,241						180,002						163,817						665,918						600,413
Safety-Kleen Sustainability Solutions			24,204						8,431						29,613						20,966						83,214						128,249
Corporate Items			(44,181)						(46,406)						(41,782)						(42,959)						(175,328)						(170,529)
Total			$	125,881					$	138,266					$	167,833					$	141,824					$	573,804					$	558,133

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(1) Direct revenue is revenue allocated to the segment performing the provided service.

(2) Cost of revenue is shown exclusive of items presented separately on the consolidated statements of operations, which consist of (i) accretion of environmental liabilities and (ii) depreciation and amortization.

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

			For the Three Months Ended																								For the Twelve Months Ended
			March 31, 2020						June 30, 2020						September 30, 2020						December 31, 2020						December 31, 2020						December 31, 2019
Net income			$	11,572					$	29,023					$	54,910					$	39,332					$	134,837					$	97,740
Accretion of environmental liabilities			2,561						2,766						2,822						2,902						11,051						10,136
Stock-based compensation			3,291						2,786						6,662						5,763						18,502						17,816
Depreciation and amortization			74,533						72,494						74,470						71,418						292,915						300,725
Other expense (income), net			2,365						500						(2,268)						(307)						290						(2,897)
Loss on early extinguishment of debt			—						—						—						—						—						6,131
Loss (gain) on sale of businesses			3,074						184						118						—						3,376						(687)
Interest expense, net of interest income			18,787						18,654						17,407						18,272						73,120						78,670
Provision for income taxes			9,698						11,859						13,712						4,444						39,713						50,499
Adjusted EBITDA			$	125,881					$	138,266					$	167,833					$	141,824					$	573,804					$	558,133