UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_______________________

FORM 10-Q

☒

QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

FOR THE QUARTERLY PERIOD ENDED

JUNE 30, ~~2022~~2023

☐

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

02061-9149

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including area code: (781) 792-5000

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading Symbol

Name of each exchange on which registered

Common Stock, $0.01 par value

CLH

New York Stock Exchange

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 ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer

☒

Accelerated filer

☐

Non-accelerated filer

☐

Smaller reporting company

☐

Emerging growth company

☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

The number of shares of Common Stock, $0.01 par value, of the registrant outstanding at July ~~29, 2022~~28, 2023 was ~~54,103,226.~~54,150,830.

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 Operations			2
Unaudited Consolidated Statements of Comprehensive Income			3
Unaudited Consolidated Statements of Cash Flows			4
Unaudited Consolidated Statements of Stockholders’ Equity			5
Notes to Unaudited Consolidated Financial Statements			6

ITEM 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations			2221

ITEM 3: Quantitative and Qualitative Disclosures About Market Risk			3432

ITEM 4: Controls and Procedures			3433

PART II: OTHER INFORMATION

ITEM 1: Legal Proceedings			3534
ITEM 1A: Risk Factors			3534
ITEM 2: Unregistered Sales of Equity Securities and Use of Proceeds			3534
ITEM 3: Defaults Upon Senior Securities			3534
ITEM 4: Mine Safety Disclosures			3534
ITEM 5: Other Information			3534
ITEM 6: Exhibits			3635
Signatures			3736

Table of Contents

~~CLEAN~~.CLEAN HARBORS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(in thousands)


		June 30, 2022		December 31, 2021			June 30, 2023		December 31, 2022
ASSETS	ASSETS	(unaudited)				ASSETS	(unaudited)
Current assets:	Current assets:					Current assets:
Cash and cash equivalents	Cash and cash equivalents	$	344,631	$	452,575	Cash and cash equivalents	$	238,776	$	492,603
Short-term marketable securities	Short-term marketable securities	70,797		81,724		Short-term marketable securities	87,346		62,033
Accounts receivable, net of allowances aggregating $49,817 and $40,140, respectively		1,005,488		792,734
Accounts receivable, net of allowances aggregating $43,393 and $45,253, respectively						Accounts receivable, net of allowances aggregating $43,393 and $45,253, respectively	981,233		964,603
Unbilled accounts receivable	Unbilled accounts receivable	134,173		94,963		Unbilled accounts receivable	122,679		107,010
Inventories and supplies	Inventories and supplies	275,696		250,692		Inventories and supplies	325,882		324,994
Prepaid expenses and other current assets	Prepaid expenses and other current assets	93,320		68,483		Prepaid expenses and other current assets	92,559		82,518
Total current assets	Total current assets	1,924,105		1,741,171		Total current assets	1,848,475		2,033,761
Property, plant and equipment, net	Property, plant and equipment, net	1,913,145		1,863,175		Property, plant and equipment, net	2,082,693		1,980,302
Other assets:	Other assets:					Other assets:
Operating lease right-of-use assets	Operating lease right-of-use assets	157,048		161,797		Operating lease right-of-use assets	181,243		166,181
Goodwill	Goodwill	1,244,655		1,227,042		Goodwill	1,288,291		1,246,878
Permits and other intangibles, net	Permits and other intangibles, net	637,254		644,912		Permits and other intangibles, net	626,320		620,782
Other	Other	48,449		15,602		Other	74,315		81,803
Total other assets	Total other assets	2,087,406		2,049,353		Total other assets	2,170,169		2,115,644
Total assets	Total assets	$	5,924,656	$	5,653,699	Total assets	$	6,101,337	$	6,129,707

LIABILITIES AND STOCKHOLDERS' EQUITY	LIABILITIES AND STOCKHOLDERS' EQUITY					LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:	Current liabilities:					Current liabilities:
Current portion of long-term debt	Current portion of long-term debt	$	17,535	$	17,535	Current portion of long-term debt	$	10,000	$	10,000
Accounts payable	Accounts payable	409,218		359,866		Accounts payable	374,438		446,629
Deferred revenue	Deferred revenue	94,531		83,749		Deferred revenue	105,327		94,094
Accrued expenses and other current liabilities	Accrued expenses and other current liabilities	387,047		391,414		Accrued expenses and other current liabilities	348,857		396,716
Current portion of closure, post-closure and remedial liabilities	Current portion of closure, post-closure and remedial liabilities	34,551		25,136		Current portion of closure, post-closure and remedial liabilities	21,802		23,123
Current portion of operating lease liabilities	Current portion of operating lease liabilities	47,176		47,614		Current portion of operating lease liabilities	53,991		49,532
Total current liabilities	Total current liabilities	990,058		925,314		Total current liabilities	914,415		1,020,094
Other liabilities:	Other liabilities:					Other liabilities:
Closure and post-closure liabilities, less current portion of $12,379 and $12,015, respectively		90,618		87,088
Remedial liabilities, less current portion of $22,172 and $13,121, respectively		101,484		98,752
Closure and post-closure liabilities, less current portion of $12,186 and $13,205, respectively						Closure and post-closure liabilities, less current portion of $12,186 and $13,205, respectively	108,522		105,596
Remedial liabilities, less current portion of $9,616 and $9,918, respectively						Remedial liabilities, less current portion of $9,616 and $9,918, respectively	102,560		106,372
Long-term debt, less current portion	Long-term debt, less current portion	2,510,963		2,517,024		Long-term debt, less current portion	2,294,306		2,414,828
Operating lease liabilities, less current portion	Operating lease liabilities, less current portion	112,854		117,991		Operating lease liabilities, less current portion	129,058		119,259
Deferred tax liabilities	Deferred tax liabilities	322,108		314,853		Deferred tax liabilities	346,328		350,389
Other long-term liabilities	Other long-term liabilities	79,621		78,790		Other long-term liabilities	96,262		90,847
Total other liabilities	Total other liabilities	3,217,648		3,214,498		Total other liabilities	3,077,036		3,187,291
Commitments and contingent liabilities (See Note 17)		0		0
Commitments and contingent liabilities (See Note 16)						Commitments and contingent liabilities (See Note 16)
Stockholders’ equity:	Stockholders’ equity:					Stockholders’ equity:
Common stock, $0.01 par value:	Common stock, $0.01 par value:					Common stock, $0.01 par value:
Authorized 80,000,000 shares; issued and outstanding 54,110,459 and 54,419,321 shares, respectively		541		544
Authorized 80,000,000 shares; issued and outstanding 54,090,202 and 54,064,797 shares, respectively						Authorized 80,000,000 shares; issued and outstanding 54,090,202 and 54,064,797 shares, respectively	541		541

Additional paid-in capital	Additional paid-in capital	512,662		536,377		Additional paid-in capital	502,422		504,240
Accumulated other comprehensive loss	Accumulated other comprehensive loss	(162,702)		(196,012)		Accumulated other comprehensive loss	(165,966)		(167,181)
Accumulated earnings	Accumulated earnings	1,366,449		1,172,978		Accumulated earnings	1,772,889		1,584,722
Total stockholders’ equity	Total stockholders’ equity	1,716,950		1,513,887		Total stockholders’ equity	2,109,886		1,922,322
Total liabilities and stockholders’ equity	Total liabilities and stockholders’ equity	$	5,924,656	$	5,653,699	Total liabilities and stockholders’ equity	$	6,101,337	$	6,129,707

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

Table of Contents

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share amounts)


		Three Months Ended				Six Months Ended					Three Months Ended				Six Months Ended
		June 30,				June 30,					June 30,				June 30,
		2022		2021		2022		2021			2023		2022		2023		2022
Revenues:	Revenues:									Revenues:
Service revenues	Service revenues	$	1,085,043	$	734,563	$	2,027,104	$	1,397,271	Service revenues	$	1,159,090	$	1,085,043	$	2,212,323	$	2,027,104
Product revenues	Product revenues	271,269		191,895		498,317		337,335		Product revenues	238,810		271,269		492,964		498,317
Total revenues	Total revenues	1,356,312		926,458		2,525,421		1,734,606		Total revenues	1,397,900		1,356,312		2,705,287		2,525,421
Cost of revenues: (exclusive of items shown separately below)	Cost of revenues: (exclusive of items shown separately below)									Cost of revenues: (exclusive of items shown separately below)
Service revenues	Service revenues	736,560		492,662		1,429,984		943,000		Service revenues	771,600		736,560		1,523,195		1,429,984
Product revenues	Product revenues	161,909		125,224		311,874		235,422		Product revenues	175,912		161,909		355,831		311,874
Total cost of revenues	Total cost of revenues	898,469		617,886		1,741,858		1,178,422		Total cost of revenues	947,512		898,469		1,879,026		1,741,858
Selling, general and administrative expenses	Selling, general and administrative expenses	155,608		124,106		306,781		245,747		Selling, general and administrative expenses	167,382		155,608		334,135		306,781
Accretion of environmental liabilities	Accretion of environmental liabilities	3,197		2,873		6,353		5,826		Accretion of environmental liabilities	3,486		3,197		6,893		6,353
Depreciation and amortization	Depreciation and amortization	87,868		71,592		172,166		143,755		Depreciation and amortization	89,697		87,868		174,455		172,166

Income from operations	Income from operations	211,170		110,001		298,263		160,856		Income from operations	189,823		211,170		310,778		298,263
Other income (expense), net		1,265		(1,480)		1,969		(2,708)
Other (expense) income, net										Other (expense) income, net	(1,283)		1,265		(1,167)		1,969
Loss on early extinguishment of debt										Loss on early extinguishment of debt	—		—		(2,362)		—
Gain on sale of business	Gain on sale of business	8,864		—		8,864		—		Gain on sale of business	—		8,864		—		8,864

Interest expense, net of interest income of $563, $580, $1,056 and $1,060, respectively		(26,256)		(18,051)		(51,273)		(35,969)
Interest expense, net of interest income of $2,001, $563, $4,956 and $1,056, respectively										Interest expense, net of interest income of $2,001, $563, $4,956 and $1,056, respectively	(30,072)		(26,256)		(50,704)		(51,273)
Income before provision for income taxes	Income before provision for income taxes	195,043		90,470		257,823		122,179		Income before provision for income taxes	158,468		195,043		256,545		257,823
Provision for income taxes	Provision for income taxes	46,886		23,395		64,352		33,368		Provision for income taxes	42,702		46,886		68,378		64,352
Net income	Net income	$	148,157	$	67,075	$	193,471	$	88,811	Net income	$	115,766	$	148,157	$	188,167	$	193,471
Earnings per share:	Earnings per share:									Earnings per share:
Basic	Basic	$	2.73	$	1.23	$	3.56	$	1.63	Basic	$	2.14	$	2.73	$	3.48	$	3.56
Diluted	Diluted	$	2.71	$	1.22	$	3.54	$	1.62	Diluted	$	2.13	$	2.71	$	3.46	$	3.54
Shares used to compute earnings per share - Basic	Shares used to compute earnings per share - Basic	54,318		54,529		54,362		54,625		Shares used to compute earnings per share - Basic	54,092		54,318		54,084		54,362
Shares used to compute earnings per share - Diluted	Shares used to compute earnings per share - Diluted	54,597		54,854		54,639		54,945		Shares used to compute earnings per share - Diluted	54,448		54,597		54,422		54,639

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

Table of Contents

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)


		Three Months Ended				Six Months Ended					Three Months Ended				Six Months Ended
		June 30,				June 30,					June 30,				June 30,
		2022		2021		2022		2021			2023		2022		2023		2022
Net income	Net income	$	148,157	$	67,075	$	193,471	$	88,811	Net income	$	115,766	$	148,157	$	188,167	$	193,471
Other comprehensive (loss) income, net of tax:
Unrealized loss on available-for-sale securities		(128)		(48)		(656)		(122)
Other comprehensive income (loss), net of tax:										Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on available-for-sale securities										Unrealized gain (loss) on available-for-sale securities	44		(128)		218		(656)

Unrealized gain (loss) on fair value of interest rate hedge		11,243		(349)		35,924		2,759
Unrealized gain on fair value of interest rate hedges										Unrealized gain on fair value of interest rate hedges	12,556		11,243		7,727		35,924
Reclassification adjustment for interest rate hedge amounts realized in net income	Reclassification adjustment for interest rate hedge amounts realized in net income	2,164		2,494		5,358		4,942		Reclassification adjustment for interest rate hedge amounts realized in net income	(4,930)		2,164		(9,054)		5,358
Reclassification adjustment for settlement of interest rate hedges										Reclassification adjustment for settlement of interest rate hedges	—		—		(5,905)		—
Unfunded pension liability	Unfunded pension liability	20		—		10		—		Unfunded pension liability	(7)		20		(7)		10
Foreign currency translation adjustments	Foreign currency translation adjustments	(13,838)		8,543		(7,326)		15,009		Foreign currency translation adjustments	7,898		(13,838)		8,236		(7,326)
Other comprehensive (loss) income, net of tax		(539)		10,640		33,310		22,588
Other comprehensive income (loss), net of tax										Other comprehensive income (loss), net of tax	15,561		(539)		1,215		33,310
Comprehensive income	Comprehensive income	$	147,618	$	77,715	$	226,781	$	111,399	Comprehensive income	$	131,327	$	147,618	$	189,382	$	226,781

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

Table of Contents

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)


		Six Months Ended					Six Months Ended
		June 30,					June 30,
		2022		2021			2023		2022
Cash flows from operating activities:	Cash flows from operating activities:					Cash flows from operating activities:
Net income	Net income	$	193,471	$	88,811	Net income	$	188,167	$	193,471
Adjustments to reconcile net income to net cash from operating activities:	Adjustments to reconcile net income to net cash from operating activities:					Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	Depreciation and amortization	172,166		143,755		Depreciation and amortization	174,455		172,166
Allowance for doubtful accounts	Allowance for doubtful accounts	6,927		2,109		Allowance for doubtful accounts	1,209		6,927
Amortization of deferred financing costs and debt discount	Amortization of deferred financing costs and debt discount	3,135		1,806		Amortization of deferred financing costs and debt discount	2,718		3,135
Accretion of environmental liabilities	Accretion of environmental liabilities	6,353		5,826		Accretion of environmental liabilities	6,893		6,353
Changes in environmental liability estimates	Changes in environmental liability estimates	1,232		445		Changes in environmental liability estimates	387		1,232
Deferred income taxes	Deferred income taxes	2,226		1,912		Deferred income taxes	(356)		2,226
Other (income) expense, net		(1,969)		2,708
Other expense (income), net						Other expense (income), net	1,167		(1,969)
Stock-based compensation	Stock-based compensation	12,547		6,785		Stock-based compensation	10,518		12,547
Loss on early extinguishment of debt						Loss on early extinguishment of debt	2,362		—
Gain on sale of business	Gain on sale of business	(8,864)		—		Gain on sale of business	—		(8,864)

Environmental expenditures	Environmental expenditures	(7,028)		(6,594)		Environmental expenditures	(16,323)		(7,028)
Changes in assets and liabilities, net of acquisitions:	Changes in assets and liabilities, net of acquisitions:					Changes in assets and liabilities, net of acquisitions:
Accounts receivable and unbilled accounts receivable	Accounts receivable and unbilled accounts receivable	(263,584)		(51,285)		Accounts receivable and unbilled accounts receivable	(5,659)		(263,584)
Inventories and supplies	Inventories and supplies	(23,888)		765		Inventories and supplies	(1,111)		(23,888)
Other current and non-current assets	Other current and non-current assets	(25,504)		(12,043)		Other current and non-current assets	(22,749)		(25,504)
Accounts payable	Accounts payable	45,748		49,880		Accounts payable	(78,139)		45,748
Other current and long-term liabilities	Other current and long-term liabilities	19,002		30,552		Other current and long-term liabilities	(27,966)		19,002
Net cash from operating activities	Net cash from operating activities	131,970		265,432		Net cash from operating activities	235,573		131,970
Cash flows used in investing activities:	Cash flows used in investing activities:					Cash flows used in investing activities:
Additions to property, plant and equipment	Additions to property, plant and equipment	(148,042)		(91,988)		Additions to property, plant and equipment	(204,298)		(148,042)
Proceeds from sale and disposal of fixed assets	Proceeds from sale and disposal of fixed assets	3,023		3,479		Proceeds from sale and disposal of fixed assets	2,944		3,023
Acquisitions, net of cash acquired	Acquisitions, net of cash acquired	(68,766)		(22,918)		Acquisitions, net of cash acquired	(120,636)		(68,766)
Proceeds from sale of business, net of transaction costs	Proceeds from sale of business, net of transaction costs	17,486		—		Proceeds from sale of business, net of transaction costs	—		17,486
Additions to intangible assets including costs to obtain or renew permits	Additions to intangible assets including costs to obtain or renew permits	(836)		(1,750)		Additions to intangible assets including costs to obtain or renew permits	(1,114)		(836)
Purchases of available-for-sale securities						Purchases of available-for-sale securities	(74,451)		(23,182)
Proceeds from sale of available-for-sale securities	Proceeds from sale of available-for-sale securities	32,835		70,526		Proceeds from sale of available-for-sale securities	50,290		32,835
Purchases of available-for-sale securities		(23,182)		(89,689)
Net cash used in investing activities	Net cash used in investing activities	(187,482)		(132,340)		Net cash used in investing activities	(347,265)		(187,482)
Cash flows used in financing activities:	Cash flows used in financing activities:					Cash flows used in financing activities:
Change in uncashed checks	Change in uncashed checks	475		(2,895)		Change in uncashed checks	2,392		475
Tax payments related to withholdings on vested restricted stock	Tax payments related to withholdings on vested restricted stock	(2,571)		(4,739)		Tax payments related to withholdings on vested restricted stock	(4,335)		(2,571)
Repurchases of common stock	Repurchases of common stock	(33,694)		(45,409)		Repurchases of common stock	(8,001)		(33,694)
Deferred financing costs paid	Deferred financing costs paid	(321)		(146)		Deferred financing costs paid	(6,346)		(321)

Payments on finance leases	Payments on finance leases	(6,552)		(3,577)		Payments on finance leases	(7,588)		(6,552)
Principal payments on debt	Principal payments on debt	(8,768)		(3,768)		Principal payments on debt	(618,975)		(8,768)

Proceeds from issuance of debt						Proceeds from issuance of debt	500,000		—
Borrowing from revolving credit facility						Borrowing from revolving credit facility	114,000		—
Payment on revolving credit facility						Payment on revolving credit facility	(114,000)		—
Net cash used in financing activities	Net cash used in financing activities	(51,431)		(60,534)		Net cash used in financing activities	(142,853)		(51,431)
Effect of exchange rate change on cash	Effect of exchange rate change on cash	(1,001)		3,915		Effect of exchange rate change on cash	718		(1,001)
(Decrease) increase in cash and cash equivalents		(107,944)		76,473
Decrease in cash and cash equivalents						Decrease in cash and cash equivalents	(253,827)		(107,944)
Cash and cash equivalents, beginning of period	Cash and cash equivalents, beginning of period	452,575		519,101		Cash and cash equivalents, beginning of period	492,603		452,575
Cash and cash equivalents, end of period	Cash and cash equivalents, end of period	$	344,631	$	595,574	Cash and cash equivalents, end of period	$	238,776	$	344,631
Supplemental information:	Supplemental information:					Supplemental information:
Cash payments for interest and income taxes:	Cash payments for interest and income taxes:					Cash payments for interest and income taxes:
Interest paid	Interest paid	$	48,104	$	34,164	Interest paid	$	49,257	$	48,104
Income taxes paid, net of refunds	Income taxes paid, net of refunds	29,307		32,519		Income taxes paid, net of refunds	92,494		29,307
Non-cash investing activities:	Non-cash investing activities:					Non-cash investing activities:
Property, plant and equipment accrued	Property, plant and equipment accrued	21,156		8,807		Property, plant and equipment accrued	26,427		21,156
Remedial liability assumed in acquisition of property, plant and equipment	Remedial liability assumed in acquisition of property, plant and equipment	13,073		—		Remedial liability assumed in acquisition of property, plant and equipment	—		13,073
ROU assets obtained in exchange for operating lease liabilities	ROU assets obtained in exchange for operating lease liabilities	20,686		5,774		ROU assets obtained in exchange for operating lease liabilities	38,474		20,686
ROU assets obtained in exchange for finance lease liabilities	ROU assets obtained in exchange for finance lease liabilities	7,646		18,704		ROU assets obtained in exchange for finance lease liabilities	13,992		7,646

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

Table of Contents

CLEAN HARBORS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands)


		Common Stock						Accumulated Other Comprehensive Loss										Common Stock								Accumulated Other Comprehensive Loss
		Number of Shares	$0.01 Par Value		Additional Paid-in Capital					Accumulated Earnings			Total Stockholders’ Equity			Number of Shares			$0.01 Par Value			Additional Paid-in Capital			Accumulated Other Comprehensive Loss					Total Stockholders’ Equity
Balance at January 1, 2022		54,419	$	544		$	536,377	$	(196,012)		$	1,172,978		$	1,513,887
Balance at January 1, 2023																	Balance at January 1, 2023	54,065		$	541		$	504,240				$	(167,181)			$	1,584,722			$	1,922,322
Net income	Net income	—	—			—		—			45,314			45,314			Net income	—		—			—			—				72,401				72,401
Other comprehensive income		—	—			—		33,849			—			33,849
Other comprehensive loss																	Other comprehensive loss	—		—			—			(14,346)				—				(14,346)
Stock-based compensation	Stock-based compensation	—	—			5,712		—			—			5,712			Stock-based compensation	—		—			6,018			—				—				6,018
Issuance of common stock for restricted share vesting, net of employee tax withholdings	Issuance of common stock for restricted share vesting, net of employee tax withholdings	36	—			(1,831)		—			—			(1,831)			Issuance of common stock for restricted share vesting, net of employee tax withholdings	49		—			(3,351)			—				—				(3,351)
Repurchases of common stock	Repurchases of common stock	(41)	—			(3,694)		—			—			(3,694)			Repurchases of common stock	(22)		—			(3,000)			—				—				(3,000)
Balance at March 31, 2022		54,414	544			536,564		(162,163)			1,218,292			1,593,237
Balance at March 31, 2023																	Balance at March 31, 2023	54,092		541			503,907			(181,527)				1,657,123				1,980,044
Net income	Net income	—	—			—		—			148,157			148,157			Net income	—		—			—			—				115,766				115,766
Other comprehensive loss		—	—			—		(539)			—			(539)
Other comprehensive income																	Other comprehensive income	—		—			—			15,561				—				15,561
Stock-based compensation	Stock-based compensation	—	—			6,835		—			—			6,835			Stock-based compensation	—		—			4,500			—				—				4,500
Issuance of common stock for restricted share vesting, net of employee tax withholdings	Issuance of common stock for restricted share vesting, net of employee tax withholdings	31	—			(740)		—			—			(740)			Issuance of common stock for restricted share vesting, net of employee tax withholdings	34		—			(984)			—				—				(984)
Repurchases of common stock	Repurchases of common stock	(335)	(3)			(29,997)		—			—			(30,000)			Repurchases of common stock	(36)		—			(5,001)			—				—				(5,001)

Balance at June 30, 2022		54,110	$	541		$	512,662	$	(162,702)		$	1,366,449		$	1,716,950
Balance at June 30, 2023																	Balance at June 30, 2023	54,090		$	541		$	502,422		$	(165,966)			$	1,772,889			$	2,109,886

Common Stock Accumulated
Other
Comprehensive Loss
Number
of
Shares
$0.01
Par
Value
Additional
Paid-in
Capital Accumulated
Earnings Total
Stockholders’
Equity
Balance at January 1, 2021 54,773 $ 548 $ 582,749 $ (211,477) $ 969,731 $ 1,341,551
Net income — — — — 21,736 21,736
Other comprehensive income — — — 11,948 — 11,948
Stock-based compensation — — 3,480 — — 3,480
Issuance of common stock for restricted share vesting, net of employee tax withholdings 78 1 (3,720) — — (3,719)
Repurchases of common stock (300) (3) (26,543) — — (26,546)
Balance at March 31, 2021 54,551 546 555,966 (199,529) 991,467 1,348,450
Net income — — — — 67,075 67,075
Other comprehensive income — — — 10,640 — 10,640
Stock-based compensation — — 3,305 — — 3,305
Issuance of common stock for restricted share vesting, net of employee tax withholdings 42 — (1,020) — — (1,020)
Repurchases of common stock (200) (2) (18,861) — — (18,863)
Balance at June 30, 2021 54,393 $ 544 $ 539,390 $ (188,889) $ 1,058,542 $ 1,409,587


	Common Stock						Accumulated Other Comprehensive Loss
	Number of Shares	$0.01 Par Value		Additional Paid-in Capital					Accumulated Earnings			Total Stockholders’ Equity
Balance at January 1, 2022	54,419	$	544		$	536,377	$	(196,012)		$	1,172,978		$	1,513,887

Net income	—	—			—		—			45,314			45,314
Other comprehensive income	—	—			—		33,849			—			33,849
Stock-based compensation	—	—			5,712		—			—			5,712
Issuance of common stock for restricted share vesting, net of employee tax withholdings	36	—			(1,831)		—			—			(1,831)
Repurchases of common stock	(41)	—			(3,694)		—			—			(3,694)
Balance at March 31, 2022	54,414	544			536,564		(162,163)			1,218,292			1,593,237

Net income	—	—			—		—			148,157			148,157
Other comprehensive loss	—	—			—		(539)			—			(539)
Stock-based compensation	—	—			6,835		—			—			6,835
Issuance of common stock for restricted share vesting, net of employee tax withholdings	31	—			(740)		—			—			(740)
Repurchases of common stock	(335)	(3)			(29,997)		—			—			(30,000)












Balance at June 30, 2022	54,110	$	541		$	512,662	$	(162,702)		$	1,366,449		$	1,716,950

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

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CLEAN HARBORS, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

(1) BASIS OF PRESENTATION

The accompanying consolidated interim financial statements are unaudited and 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 and are necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented. Management has made estimates and assumptions affecting the amounts reported in the Company's consolidated interim financial statements and accompanying footnotes; actual results could differ from those estimates and judgments. 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 conjunction with the financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022.

(2) SIGNIFICANT ACCOUNTING POLICIES

The Company's significant accounting policies are described in Note 2, "Significant Accounting Policies," in the Company's Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022. There have been no material changes in these policies or their application ~~during~~except for the ~~periods presented.~~change described below.

Segment Reporting and Goodwill

Pursuant to the previous succession announcement, effective March 31, 2023, Michael L. Battles and Eric W. Gerstenberg, former Chief Financial Officer and Chief Operating Officer of the Company, respectively, were appointed co-CEOs. As a result, the Company’s new Chief Operating Decision Maker (“CODM”) is a committee comprised of both co-CEOs, who, going forward, will manage the business, make operating decisions and assess performance. The Company does not expect that the new CODM structure will change how the Company is managed and as such will continue to report as two operating segments; (i) the Environmental Services segment and (ii) the Safety-Kleen Sustainability Solutions segment and assess the recoverability of goodwill under three reporting units; (i) Environmental Sales and Service, (ii) Environmental Facilities and (iii) Safety-Kleen Sustainability Solutions.

(3) REVENUES

The ~~Company’s~~Company generates revenues through the following operating segments: Environmental Services and Safety-Kleen Sustainability Solutions. The Company's Environmental Services operating segment generally has four sources of revenue and the Safety-Kleen Sustainability Solutions operating segment has two sources of revenue. The Company disaggregates third-party revenues ~~are disaggregated~~ by geographic location and source of revenue as management believes these categories depict how revenue and cash flows are affected by economic factors. The Company's significant sources of revenue include:

Technical Services—Technical Services contribute to the revenues of the Environmental Services operating segment. Revenues for these services are generated from fees charged for waste material management and disposal services including onsite environmental management services, large remediation projects, collection and transportation, packaging, recycling, treatment and disposal of waste. Revenue is primarily generated by short-term projects, most of which are governed by master service agreements that are long-term in nature. These master service agreements are typically entered into with the Company's larger customers and outline the pricing and legal frameworks for such arrangements. Services are provided based on purchase orders or agreements with the customer and include prices based upon units of volume of waste, material and personnel costs as well as transportation and other fees. Collection and transportation revenues are recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred as a basis for measuring the satisfaction of the performance obligation. Revenues for treatment and disposal of waste are recognized upon completion of treatment, final disposition in a landfill or ~~incineration,~~incinerator, or when the waste is shipped to a third-party for processing and disposal. The Company periodically enters into bundled arrangements for the collection and transportation and disposal of waste. For such arrangements, transportation and disposal are considered distinct performance obligations and the Company allocates revenue to each based on the relative standalone selling price (i.e., the estimated price that a customer would pay for the services on a standalone basis). Revenues and the related costs from waste that is not yet completely processed and disposed of are deferred. The deferred revenues and costs are recognized when the services are completed. The period between collection and transportation and the final processing and disposal ranges depending on the location of the customer, but generally is measured in days.

~~Field and Emergency Response Services~~—Field and Emergency Response Services contribute to the revenues of the Environmental Services operating segment. Field Services revenues are generated from cleanup services at customer sites, including those managed by municipalities and utility providers, or other locations on a scheduled or emergency response basis. Services include confined space entry for tank cleaning, site decontamination, remediation, railcar cleaning, manhole/vault clean outs, product recovery and transfer and vacuum services. Additional services include filtration and water treatment services. Response services for environmental emergencies of any scale range from man-made disasters such as oil spills to natural disasters such as hurricanes. Emergency response services also include spill cleanup on land and water, contagion disinfection, decontamination and disposal services most recently in response to the COVID-19 pandemic. Field and emergency response services are provided based on purchase orders or agreements with customers and include prices generally based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The

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Company uses the input method to recognize revenue over time, based on time and materials incurred. The duration of such services can be over a number of hours, several days or even months for larger scale projects.

Industrial Services and Other—Industrial Services contribute to the revenues of the Environmental Services operating segment. These revenues are primarily generated from industrial and specialty services provided to refineries, ~~mines, upgraders,~~ chemical plants, manufacturing facilities, power generation companies, pulp and paper mills, ~~manufacturing facilities, power generation facilities~~mines and other industrial customers throughout North America. Services include in-plant cleaning and maintenance services, plant outage and turnaround services, specialty cleaning services including chemical cleaning, pigging and high and ultra-high pressure water cleaning, leak detection and repair, daylighting, production services and upstream energy services. Services are provided based on purchase orders or agreements with the customer and include prices based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred.

Field and Emergency Response Services—Field and Emergency Response Services contribute to the revenues of the Environmental Services operating segment. Field Services revenues are generated from cleanup services at customer sites, including those managed by municipalities and utility providers, or other locations on a scheduled or emergency response basis. Services include confined space entry for tank cleaning, site decontamination, remediation, railcar cleaning, manhole/vault clean outs, product recovery and transfer and vacuum services. Additional services include filtration and water treatment services. Response services for environmental emergencies of any scale range from man-made disasters such as oil spills to natural disasters like hurricanes. Emergency response services also include spill cleanup on land and water, as well as contagion disinfection, decontamination and disposal services. Field and emergency response services are provided based on purchase orders or agreements with customers and include prices generally based upon daily, hourly or job rates for equipment, materials and personnel. The Company recognizes revenue for these services over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The Company uses the input method to recognize revenue over time, based on time and materials incurred. The duration of such services can be over a number of hours, several days or even months for larger scale projects.

Safety-Kleen Environmental Services—Safety-Kleen Environmental Services revenues contribute both to the Environmental Services operating segment and the Safety-Kleen Sustainability Solutions operating segment depending upon the nature of such revenues and operating responsibilities relative to executing the revenue contracts. Revenues from providing containerized waste handling and disposal services, parts washer services and vacuum services, referred to collectively as the Safety-Kleen branches' core service offerings, contribute to the revenues of the Environmental Services operating segment. In addition, sales of packaged blended oil products and other complementary product sales contribute to the revenues of the Environmental Services operating segment. Revenues generated from waste oil, anti-freeze and oil filter collection services, sales of bulk blended oil products and sales of bulk automotive fluids contribute to the Safety-Kleen Sustainability Solutions operating segment.

Generally, the revenue from services is recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. The duration of such services can be over a number of hours or several days. The Company uses the input method to recognize revenue over time, based on time and materials incurred. Product revenue is recognized upon the transfer of control whereby control transfers when the products are delivered to the customer. Containerized waste services consist of profiling, collecting, transporting and recycling or disposing of a wide variety of waste. Related collection and transportation revenues are recognized over time, as the customer receives and consumes the benefits of the services as they are being performed and the Company has a right to payment for performance completed to date. Parts washer services include customer use of ~~our~~the Company's parts washer equipment, cleaning and maintenance of the parts washer equipment and removal and replacement of used cleaning fluids. Parts washer services are considered a single performance obligation due to the highly integrated and interdependent nature of the arrangement. Revenue from parts washer services is recognized over the service interval as the customer receives the benefit of the services.

Safety-Kleen Oil—Safety-Kleen Oil related sales contribute to the revenues of the Safety-Kleen Sustainability Solutions segment. These revenues are generated from sales of high-quality base and blended lubricating oils to third-party distributors, government agencies, fleets, railroads and industrial customers. The business also sells recycled fuel oil to asphalt plants, industrial plants and pulp and paper companies. The used oil is also processed into vacuum gas oil which can be further re-refined into lubricant base oils or sold directly into the marine diesel oil fuel market. Revenue for oil products is recognized at a point in time, upon the transfer of control. Control transfers when the products are delivered to the customer.

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The following tables present the Company's third-party revenue disaggregated by source of revenue and geography (in thousands):


		For the Three Months Ended June 30, 2022									For the Three Months Ended June 30, 2023
		Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total			Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total
Primary Geographical Markets	Primary Geographical Markets									Primary Geographical Markets
United States	United States	$	945,579	$	236,879	$	79	$	1,182,537	United States	$	1,041,739	$	212,994	$	116	$	1,254,849
Canada	Canada	138,927		34,848		—		173,775		Canada	119,743		23,308		—		143,051
Total third-party revenues	Total third-party revenues	$	1,084,506	$	271,727	$	79	$	1,356,312	Total third-party revenues	$	1,161,482	$	236,302	$	116	$	1,397,900

Sources of Revenue	Sources of Revenue									Sources of Revenue
Technical Services	Technical Services	$	387,019	$	—	$	—	$	387,019	Technical Services	$	389,908	$	—	$	—	$	389,908
Field and Emergency Response Services (1)		144,860		—		—		144,860
Industrial Services and Other (2)		360,870		—		79		360,949
Industrial Services and Other										Industrial Services and Other	399,545		—		116		399,661
Field and Emergency Response Services										Field and Emergency Response Services	154,359		—		—		154,359
Safety-Kleen Environmental Services	Safety-Kleen Environmental Services	191,757		49,381		—		241,138		Safety-Kleen Environmental Services	217,670		62,452		—		280,122
Safety-Kleen Oil	Safety-Kleen Oil	—		222,346		—		222,346		Safety-Kleen Oil	—		173,850		—		173,850
Total third-party revenues	Total third-party revenues	$	1,084,506	$	271,727	$	79	$	1,356,312	Total third-party revenues	$	1,161,482	$	236,302	$	116	$	1,397,900

~~_____________~~

~~(1) Includes approximately $34.2 million of third-party revenues from the operations of the HydroChemPSC business~~


	For the Three Months Ended June 30, 2022
	Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total
Primary Geographical Markets
United States	$	945,579	$	236,879	$	79	$	1,182,537
Canada	138,927		34,848		—		173,775
Total third-party revenues	$	1,084,506	$	271,727	$	79	$	1,356,312

Sources of Revenue
Technical Services	$	387,019	$	—	$	—	$	387,019
Industrial Services and Other	360,870		—		79		360,949
Field and Emergency Response Services	144,860		—		—		144,860
Safety-Kleen Environmental Services	191,757		49,381		—		241,138
Safety-Kleen Oil	—		222,346		—		222,346
Total third-party revenues	$	1,084,506	$	271,727	$	79	$	1,356,312

~~(2) Includes approximately $173.7 million of third-party revenues from the operations of the HydroChemPSC business~~


		For the Three Months Ended June 30, 2021									For the Six Months Ended June 30, 2023
		Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total			Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total
Primary Geographical Markets	Primary Geographical Markets									Primary Geographical Markets
United States	United States	$	616,585	$	180,216	$	79	$	796,880	United States	$	2,000,323	$	434,765	$	223	$	2,435,311
Canada	Canada	106,562		23,016		—		129,578		Canada	222,141		47,835		—		269,976
Total third-party revenues	Total third-party revenues	$	723,147	$	203,232	$	79	$	926,458	Total third-party revenues	$	2,222,464	$	482,600	$	223	$	2,705,287

Sources of Revenue	Sources of Revenue									Sources of Revenue
Technical Services	Technical Services	$	306,865	$	—	$	—	$	306,865	Technical Services	$	756,417	$	—	$	—	$	756,417
Industrial Services and Other										Industrial Services and Other	735,924		—		223		736,147
Field and Emergency Response Services	Field and Emergency Response Services	106,986		—		—		106,986		Field and Emergency Response Services	302,445		—		—		302,445
Industrial Services and Other		150,367		—		79		150,446
Safety-Kleen Environmental Services	Safety-Kleen Environmental Services	158,929		40,453		—		199,382		Safety-Kleen Environmental Services	427,678		112,011		—		539,689
Safety-Kleen Oil	Safety-Kleen Oil	—		162,779		—		162,779		Safety-Kleen Oil	—		370,589		—		370,589
Total third-party revenues	Total third-party revenues	$	723,147	$	203,232	$	79	$	926,458	Total third-party revenues	$	2,222,464	$	482,600	$	223	$	2,705,287

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For the Six Months Ended June 30, 2022
Environmental Services Safety-Kleen Sustainability Solutions Corporate Total
Primary Geographical Markets
United States $ 1,780,257 $ 439,409 $ 151 $ 2,219,817
Canada 245,047 60,557 — 305,604
Total third-party revenues $ 2,025,304 $ 499,966 $ 151 $ 2,525,421
Sources of Revenue
Technical Services $ 710,675 $ — $ — $ 710,675
Field and Emergency Response Services (1)
277,219 — — 277,219
Industrial Services and Other (2)
669,708 — 151 669,859
Safety-Kleen Environmental Services 367,702 93,769 — 461,471
Safety-Kleen Oil — 406,197 — 406,197
Total third-party revenues $ 2,025,304 $ 499,966 $ 151 $ 2,525,421

~~_____________~~

~~(1) Includes approximately $62.2 million of third-party revenues from the operations of the HydroChemPSC business~~

~~(2) Includes approximately $329.8 million of third-party revenues from the operations of the HydroChemPSC business~~


		For the Six Months Ended June 30, 2021									For the Six Months Ended June 30, 2022
		Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total			Environmental Services		Safety-Kleen Sustainability Solutions		Corporate		Total
Primary Geographical Markets	Primary Geographical Markets									Primary Geographical Markets
United States	United States	$	1,192,093	$	319,206	$	158	$	1,511,457	United States	$	1,780,257	$	439,409	$	151	$	2,219,817
Canada	Canada	183,932		39,217		—		223,149		Canada	245,047		60,557		—		305,604
Total third-party revenues	Total third-party revenues	$	1,376,025	$	358,423	$	158	$	1,734,606	Total third-party revenues	$	2,025,304	$	499,966	$	151	$	2,525,421

Sources of Revenue	Sources of Revenue									Sources of Revenue
Technical Services	Technical Services	$	578,905	$	—	$	—	$	578,905	Technical Services	$	710,675	$	—	$	—	$	710,675
Industrial Services and Other										Industrial Services and Other	669,708		—		151		669,859
Field and Emergency Response Services	Field and Emergency Response Services	212,154		—		—		212,154		Field and Emergency Response Services	277,219		—		—		277,219
Industrial Services and Other		270,177		—		158		270,335
Safety-Kleen Environmental Services	Safety-Kleen Environmental Services	314,789		79,431		—		394,220		Safety-Kleen Environmental Services	367,702		93,769		—		461,471
Safety-Kleen Oil	Safety-Kleen Oil	—		278,992		—		278,992		Safety-Kleen Oil	—		406,197		—		406,197
Total third-party revenues	Total third-party revenues	$	1,376,025	$	358,423	$	158	$	1,734,606	Total third-party revenues	$	2,025,304	$	499,966	$	151	$	2,525,421

Contract Balances


(in thousands)	(in thousands)	June 30, 2022		December 31, 2021		(in thousands)	June 30, 2023		December 31, 2022
Receivables	Receivables	$	1,005,488	$	792,734	Receivables	$	981,233	$	964,603
Contract assets (unbilled receivables)	Contract assets (unbilled receivables)	134,173		94,963		Contract assets (unbilled receivables)	122,679		107,010
Contract liabilities (deferred revenue)	Contract liabilities (deferred revenue)	94,531		83,749		Contract liabilities (deferred revenue)	105,327		94,094

The timing of revenue recognition, billings and cash collections results in billed accounts receivable, unbilled receivables (contract assets) and customer advances and deposits or deferred revenue (contract liabilities) on the consolidated balance sheet. Generally, billing occurs subsequent to revenue recognition, as a right to payment is not just subject to passage of time, resulting in contract ~~assets. Contract~~ assets, which are generally classified as current. The Company sometimes receives advances or deposits from its customers before revenue is recognized, resulting in contract liabilities. These assets and liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. The contract liability balances at the beginning of each period presented were generally fully recognized in the subsequent three-month period.

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(4) BUSINESS COMBINATIONS

~~2022~~2023 Acquisition

On ~~June 17, 2022,~~March 31, 2023, the Company acquired ~~a privately-owned company~~Thompson Industrial Services, LLC ("Thompson Industrial") for an all-cash purchase price of ~~approximately $73.8~~$111.9 million, net of cash acquired and subject to the final settlement of working ~~capital adjustments.~~capital. The operations of ~~the newly acquired company~~Thompson Industrial expand the ~~Safety-Kleen Sustainability Solutions~~Environmental Services segment's ~~waste oil collection capabilities and re-refining business throughout~~industrial service operations in the ~~southeast~~southeastern region of the United ~~States, including the addition of a re-refinery in Georgia.~~States.

The preliminary allocation of the purchase price is provisional and was based on estimates of the fair value of assets acquired and liabilities assumed as of ~~June 17, 2022.~~the acquisition date. The Company continues to obtain information to complete the valuation of these balances and the associated income tax accounting. Measurement period adjustments will reflect new information obtained

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about facts and circumstances that existed as of the acquisition date. The following table summarizes the preliminary determination and recognition of assets acquired and liabilities assumed (in thousands):

~~At June 17, 2022~~

~~Accounts receivable~~

~~1,079~~

~~Inventories and supplies~~

~~5,737~~

~~Prepaid expenses and other current assets~~

~~269~~

~~Property, plant and equipment~~

~~23,270~~

~~Permits and other intangibles~~

~~16,750~~

~~Operating lease right-of-use assets~~

~~585~~

~~Other non-current assets~~

~~Current liabilities~~

~~(2,756)~~

~~Current portion of operating lease liabilities~~

~~(186)~~

~~Operating lease liabilities, less current portion~~

~~(399)~~

~~Total identifiable net assets~~

~~44,391~~

~~Goodwill~~

~~29,375~~

~~Total purchase price~~

~~73,766~~


	At Acquisition Date As Reported March 31, 2023		Measurement Period Adjustments		At Acquisition Date As Reported June 30, 2023
Accounts receivable	$	25,793	$	(563)	$	25,230
Inventories and supplies	233		—		233
Prepaid expenses and other current assets	1,150		154		1,304
Property, plant and equipment	28,030		(1,301)		26,729
Permits and other intangibles	28,100		800		28,900
Operating lease right-of-use assets	4,716		—		4,716
Other non-current assets	36		36		72
Current liabilities	(11,514)		1,586		(9,928)
Current portion of operating lease liabilities	(1,653)		—		(1,653)
Operating lease liabilities, less current portion	(3,063)		—		(3,063)

Other long-term liabilities	—		(570)		(570)
Total identifiable net assets	71,828		142		71,970
Goodwill	40,092		(167)		39,925
Total purchase price	$	111,920	$	(25)	$	111,895

~~Intangible~~Permits and other intangible assets acquired include customer relationships, trademarks/tradenames and non-compete agreements and are anticipated to have estimated useful lives of between five and 15 years with a weighted average useful life of approximately 13 years. The excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible and intangible assets acquired and liabilities assumed, was recorded as goodwill. The goodwill recognized is attributable to the expected operating synergies, assembled workforce and growth potential that the Company expects to realize from the acquisition. Goodwill generated from the acquisition is deductible for tax purposes.

The operations included in the Company's financial statements for the three and six months ended June 30, 2023, and pro forma revenue and earnings amounts on a combined basis as if this acquisition had been completed on January 1, 2022 are immaterial to the consolidated financial statements of the Company.

2022 Acquisitions

On June 17, 2022, the Company acquired a privately-owned company for an all-cash purchase price of approximately $78.9 million, net of cash acquired. The operations of the newly acquired company expand the Safety-Kleen Sustainability Solutions segment's waste oil collection capabilities and re-refining business throughout the southeastern region of the United States, including the addition of a re-refinery in Georgia.

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The Company has finalized the purchase accounting for this acquisition. The allocation of the purchase price was based on estimates of the fair value and assets acquired and liabilities assumed as of June 17, 2022. The following table summarizes the final determination and recognition of assets acquired and liabilities assumed (in thousands):


	At Acquisition Date As Reported December 31, 2022		Measurement Period Adjustments		Final Allocation At Acquisition Date As Reported June 30, 2023
Accounts receivable	$	1,111	$	(22)	$	1,089
Inventories and supplies	5,816		(71)		5,745
Prepaid expenses and other current assets	144		—		144
Property, plant and equipment	19,605		2,626		22,231
Permits and other intangibles	23,500		—		23,500
Operating lease right-of-use assets	585		—		585
Other non-current assets	13		—		13
Current liabilities	(3,271)		(104)		(3,375)
Current portion of operating lease liabilities	(186)		—		(186)
Operating lease liabilities, less current portion	(399)		—		(399)

Other long-term liabilities	(55)		(2,626)		(2,681)
Total identifiable net assets	46,863		(197)		46,666
Goodwill	32,015		197		32,212
Total purchase price	$	78,878	$	—	$	78,878

Permits and other intangible assets acquired include supplier relationships, permits, customer relationships and trademarks/tradenames and are anticipated to have estimated useful lives of between five and 20 years with a weighted average useful life of approximately 1718 years. The excess of the total purchase price, which includes the aggregate cash consideration paid in excess of the fair value of the tangible and intangible assets acquired, was recorded as goodwill. The goodwill recognized is attributable to the expected operating synergies, assembled workforce and growth potential that the Company expects to realize from the acquisition. Goodwill generated from the acquisition is deductible for tax purposes.

The operations included in the Company's financial statements for the period ended June 30, 2022 and pro forma revenue and earnings amounts on a combined basis as if this acquisition had been completed on January 1, 2021 are immaterial to the consolidated financial statements of the Company.

~~2021 Acquisitions~~

On October 8, 2021, the Company completed the acquisition of LJ Energy Services Intermediate Holding Corp. and its subsidiaries (collectively, “HydroChemPSC”), a privately-owned company, for an all-cash purchase price of approximately $1.23 billion. HydroChemPSC is a leading U.S. provider of industrial cleaning, specialty maintenance and utilities services. These operations enhance and have been integrated into the Company's Environmental Services segment. In the first quarter ofDecember 9, 2022, the Company ~~received $5.0 million after finalizing the acquisition date working capital balances, which decreased the overall purchase price.~~

The allocation of the purchase price was based on estimates of the fair value of assets acquired and liabilities assumed as of October 8, 2021. The Company continues to obtain information to complete the valuation of these balances and the associated income tax accounting. Measurement period adjustments reflect new information obtained about facts and circumstances that existed

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as of the acquisition date, including the adjustment for the monies received for the working capital finalization noted above. The components and allocation of the purchase price consist of the following amounts (in thousands):

At Acquisition Date As Reported December 31, 2021 Measurement Period Adjustments
At Acquisition Date
As Reported
June 30, 2022
Accounts receivable, including unbilled receivables $ 131,924 $ (395) $ 131,529
Inventories and supplies 3,162 — 3,162
Prepaid expenses and other current assets 16,016 363 16,379
Property, plant and equipment 313,540 — 313,540
Other intangibles 289,000 — 289,000
Operating lease right-of-use assets 34,347 68 34,415
Other non-current assets 1,045 (60) 985
Current liabilities (115,704) (883) (116,587)
Current portion of operating lease liabilities (11,659) 382 (11,277)
Operating lease liabilities, less current portion (26,128) (216) (26,344)
Deferred tax liabilities (85,908) 2,436 (83,472)
Other long-term liabilities (2,685) (242) (2,927)
Total identifiable net assets 546,950 1,453 548,403
Goodwill (i)
683,463 (6,453) 677,010
Total purchase price $ 1,230,413 $ (5,000) $ 1,225,413
~~_____________~~

(i) Goodwill represents the excess of the fair value of the net assets acquired over the purchase price. Goodwill of $677.0 million was assigned to the Environmental Sales & Service reporting unit and is attributable to the future economic benefits arising from the acquired operations, synergies and the acquired workforce of HydroChemPSC. None of the goodwill related to this acquisition will be deductible for tax purposes.

HydroChemPSC's results of operations have been included in the Company's financial statements for the period subsequent to the completion of the acquisition on October 8, 2021. The following unaudited supplemental pro-forma data presents consolidated information as if the acquisition had occurred on January 1, 2021 (in thousands):

Three Months Ended June 30, 2021 Six Months Ended June 30, 2021
Pro forma combined revenues $ 1,121,121 $ 2,107,309
Pro forma combined net income 74,526 102,078

The pro forma results do not include any costs incurred directly attributable to the acquisition of HydroChemPSC. The pro forma results do reflect impacts resulting from the issuance of $1.0 billion senior secured term loans issued in connection with the acquisition assuming interest rates in effect at the time of the acquisition.

This pro forma financial information is not necessarily indicative of the Company's consolidated operating results that would have been reported had the transactions been completed as described herein, nor is such information necessarily indicative of the Company's consolidated results for any future period. Interest expense used in calculating the pro forma net income did not contemplate the interest rate swaps that the Company put in place in early 2022.

~~On March 27, 2021, the Company also~~ acquired a privately-owned business for ~~$22.8~~$12.6 million cash consideration. The acquired company ~~increases~~expands the Safety-Kleen Sustainability Solutions segment's ~~network within~~oil collection operations in the ~~south central~~southeastern region of the United States. In connection with this acquisition, ~~a final~~ goodwill ~~amount~~ of ~~$16.3~~$2.6 million was recognized. The results of operations for the acquired business were not material in 2022.

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(5) DISPOSITION OF BUSINESS

On June 30, 2022, the Company completed the sale of a line of business as part of its continuous focus on divesting certain non-core operations. The divested line of business was previously included within the Environmental Sales & ~~Services~~Service reporting unit of the Environmental Services segment. The Company determined that the disposition did not constitute a strategic shift and that the impact on the Company's overall operations and financial results will not be material. Accordingly, the operations associated with the disposal are not reported in discontinued operations. The final purchase price for the line of business was ~~sold for $19.5~~$18.8 million, ~~and is subject to customary post-closing conditions.~~after settling working capital. The gain on sale of $8.9 million, after accounting for the assets sold, liabilities transferred upon sale and transaction costs, is included in gain on sale of business in the ~~Company’s~~Company's consolidated statement of operations for the three and six months ended June 30, 2022.

(6) INVENTORIES AND SUPPLIES

Inventories and supplies consisted of the following (in thousands):


		June 30, 2022		December 31, 2021			June 30, 2023		December 31, 2022
Oil and oil related products	Oil and oil related products	$	112,656	$	101,965	Oil and oil related products	$	129,575	$	151,519
Supplies	Supplies	136,038		126,602		Supplies	162,788		143,743
Solvent and solutions	Solvent and solutions	11,304		8,099		Solvent and solutions	13,004		11,994
Other	Other	15,698		14,026		Other	20,515		17,738
Total inventories and supplies	Total inventories and supplies	$	275,696	$	250,692	Total inventories and supplies	$	325,882	$	324,994

Supplies inventories consist primarily of critical spare parts to support the Company's incinerator and re-refinery operations

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and other general supplies used in our normal day-to-day operations. Other inventories consist primarily of parts washer components, cleaning fluids, absorbents and automotive fluids, such as windshield washer fluid and antifreeze.

(7) PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following (in thousands):


		June 30, 2022		December 31, 2021			June 30, 2023		December 31, 2022
Land	Land	$	174,744	$	165,010	Land	$	174,235	$	172,579
Asset retirement costs (non-landfill)	Asset retirement costs (non-landfill)	19,598		19,105		Asset retirement costs (non-landfill)	27,164		22,001
Landfill assets	Landfill assets	214,558		205,873		Landfill assets	244,639		232,872
Buildings and improvements (1)	Buildings and improvements (1)	571,078		551,795		Buildings and improvements (1)	617,189		591,397
Camp equipment		124,672		127,680

Vehicles (2)	Vehicles (2)	950,754		912,836		Vehicles (2)	1,174,004		1,112,188
Equipment (3)	Equipment (3)	2,136,376		2,092,395		Equipment (3)	2,307,666		2,195,064
Furniture and fixtures		6,574		6,444

Construction in progress	Construction in progress	98,189		60,447		Construction in progress	170,120		140,328
		4,296,543		4,141,585			4,715,017		4,466,429
Less - accumulated depreciation and amortization	Less - accumulated depreciation and amortization	2,383,398		2,278,410		Less - accumulated depreciation and amortization	2,632,324		2,486,127
Total property, plant and equipment, net	Total property, plant and equipment, net	$	1,913,145	$	1,863,175	Total property, plant and equipment, net	$	2,082,693	$	1,980,302

________________

(1) Balances inclusive of gross right-of-use ("ROU") assets classified as finance leases of $8.0 million ~~and $8.9 million respectively.~~ in both periods.

(2) Balances inclusive of gross ROU assets classified as finance leases of ~~$85.3~~$120.8 million and ~~$77.7~~$106.7 million, respectively.

(3) Balances inclusive of gross ROU assets classified as finance leases of ~~$9.3~~ $9.2 million in both periods.

Depreciation expense, inclusive of landfill and finance lease amortization, was $77.2 million and $149.2 million for the three and six months ended June 30, 2023, respectively. Depreciation expense, inclusive of landfill and finance lease amortization, was $75.6 million and $147.7 million for the three and six months ended June 30, 2022, respectively. ~~Depreciation expense, inclusive of landfill and finance lease amortization, was $63.8~~The Company recorded $1.4 million and ~~$128.4~~$2.7 million ~~for~~of capitalized interest during the three and six months ended June 30, ~~2021,~~2023, respectively. The Company recorded $0.7 million and $1.1 million of capitalized interest during the three and six months ended June 30, 2022, respectively. The capitalized interest in the periods is mainly due to the construction of a new incinerator in Kimball, Nebraska.

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(8) GOODWILL AND OTHER INTANGIBLE ASSETS

The changes in goodwill by segment for the six months ended June 30, ~~2022~~2023 were as follows (in thousands):

Environmental Services Safety-Kleen Sustainability Solutions Totals
Balance at January 1, 2022 $ 1,085,534 $ 141,508 $ 1,227,042
Increase from current period acquisition — 29,375 29,375
Measurement period adjustments from prior period acquisition (6,453) — (6,453)
Decrease from disposition of business (4,412) — (4,412)
Foreign currency translation (659) (238) (897)
Balance at June 30, 2022 $ 1,074,010 $ 170,645 $ 1,244,655


	Environmental Services		Safety-Kleen Sustainability Solutions		Totals
Balance at January 1, 2023	$	1,071,846	$	175,032	$	1,246,878
Increase from current period acquisition	39,925		—		39,925
Measurement period adjustments from prior period acquisitions	—		340		340

Foreign currency translation	818		330		1,148
Balance at June 30, 2023	$	1,112,589	$	175,702	$	1,288,291

~~The decrease from disposition of business relates to the divestiture discussed in Note 5, "Disposition of Business."~~ The Company assesses goodwill on an annual basis as of December 31 or at an interim date when events or changes in the business environment (“triggering events”) would more likely than not reduce the fair value of a reporting unit below its carrying value. During the period ended June 30, ~~2022,~~2023, no such triggering events were identified.

As of June 30, ~~2022~~2023 and December 31, ~~2021,~~2022, the Company's intangible assets consisted of the following (in thousands):


		June 30, 2022						December 31, 2021							June 30, 2023						December 31, 2022
		Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net			Cost		Accumulated Amortization		Net		Cost		Accumulated Amortization		Net
Permits	Permits	$	189,675	$	105,957	$	83,718	$	187,519	$	102,408	$	85,111	Permits	$	190,209	$	113,404	$	76,805	$	188,373	$	109,036	$	79,337
Customer and supplier relationships	Customer and supplier relationships	589,192		229,277		359,915		576,474		214,776		361,698		Customer and supplier relationships	604,992		244,537		360,455		583,709		229,368		354,341
Other intangible assets	Other intangible assets	95,688		25,100		70,588		94,271		19,359		74,912		Other intangible assets	100,068		31,291		68,777		89,388		24,818		64,570
Total amortizable permits and other intangible assets	Total amortizable permits and other intangible assets	874,555		360,334		514,221		858,264		336,543		521,721		Total amortizable permits and other intangible assets	895,269		389,232		506,037		861,470		363,222		498,248
Trademarks and trade names	Trademarks and trade names	123,033		—		123,033		123,191		—		123,191		Trademarks and trade names	120,283		—		120,283		122,534		—		122,534
Total permits and other intangible assets	Total permits and other intangible assets	$	997,588	$	360,334	$	637,254	$	981,455	$	336,543	$	644,912	Total permits and other intangible assets	$	1,015,552	$	389,232	$	626,320	$	984,004	$	363,222	$	620,782

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Amortization expense of permits, customer and supplier relationships and other intangible assets was $12.5 million and $25.2 million in the three and six months ended June 30, 2023, respectively. Amortization expense of permits, customer and supplier relationships and other intangible assets was $12.3 million and $24.5 million in the three and six months ended June 30, 2022, respectively. ~~Amortization expense of permits, customer and supplier relationships and other intangible assets was $7.8 million and $15.4 million in the three and six months ended June 30, 2021, respectively.~~

The expected amortization of the net carrying amount of finite-lived intangible assets at June 30, ~~2022~~2023 was as follows (in thousands):


Years Ending December 31,	Years Ending December 31,	Expected Amortization		Years Ending December 31,	Expected Amortization
2022 (six months)		$	24,966
2023		45,728
2023 (six months)				2023 (six months)	$	24,894
2024	2024	40,256		2024	46,461
2025	2025	39,051		2025	43,036
2026	2026	37,167		2026	41,146
2027				2027	39,067
Thereafter	Thereafter	327,053		Thereafter	311,433
		$	514,221		$	506,037

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(9) ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES

Accrued expenses and other current liabilities consisted of the following (in thousands):

June 30, 2022 December 31, 2021
Accrued insurance $ 96,642 $ 102,853
Accrued interest 19,763 19,785
Accrued compensation and benefits 113,575 133,604
Accrued income, real estate, sales and other taxes 66,071 29,954
Interest rate swap liability — 17,383
Accrued other 90,996 87,835
$ 387,047 $ 391,414

~~The decrease in the interest rate swap liability balance from December 31, 2021 is due to changes in future interest rate~~

expectations. As of June 30, 2022, the interest rate swap derivatives are in an asset position and therefore are included within Other Assets on the consolidated balance sheet. For additional information relating to the interest rate swaps, see Note 12, "Financing Arrangements."


	June 30, 2023		December 31, 2022
Accrued insurance	$	96,132	$	92,909
Accrued interest	33,611		20,033
Accrued compensation and benefits	83,680		123,226
Accrued income, real estate, sales and other taxes	41,839		61,442

Accrued other	93,595		99,106
	$	348,857	$	396,716

(10) CLOSURE AND POST-CLOSURE LIABILITIES

The changes to closure and post-closure liabilities (also referred to as “asset retirement obligations”) from January 1, ~~2022~~2023 through June 30, ~~2022~~2023 were as follows (in thousands):


		Landfill Retirement Liability		Non-Landfill Retirement Liability		Total			Landfill Retirement Liability		Non-Landfill Retirement Liability		Total
Balance at January 1, 2022		$	53,425	$	45,678	$	99,103

Balance at January 1, 2023								Balance at January 1, 2023	$	62,251	$	56,550	$	118,801
Liabilities assumed in acquisitions								Liabilities assumed in acquisitions	—		584		584
Measurement period adjustments from prior period acquisitions								Measurement period adjustments from prior period acquisitions	—		3,015		3,015
New asset retirement obligations	New asset retirement obligations	1,657		—		1,657		New asset retirement obligations	1,348		—		1,348

Accretion	Accretion	2,250		1,993		4,243		Accretion	2,555		2,182		4,737
Changes in estimates recorded to consolidated statement of operations	Changes in estimates recorded to consolidated statement of operations	329		47		376		Changes in estimates recorded to consolidated statement of operations	—		135		135
Changes in estimates recorded to consolidated balance sheet	Changes in estimates recorded to consolidated balance sheet	—		504		504		Changes in estimates recorded to consolidated balance sheet	(260)		1,531		1,271
Expenditures	Expenditures	(2,126)		(622)		(2,748)		Expenditures	(5,408)		(4,093)		(9,501)
Currency translation and other	Currency translation and other	(100)		(38)		(138)		Currency translation and other	169		149		318
Balance at June 30, 2022		$	55,435	$	47,562	$	102,997
Balance at June 30, 2023								Balance at June 30, 2023	$	60,655	$	60,053	$	120,708

During the first quarter of 2023, the Company's non-commercial landfill at the Deer Park, Texas incineration facility reached its permitted capacity, as expected. The Company has commenced closure activities; however, there have been no changes to the liabilities related to this location. In the six months ended June 30, ~~2022,~~2023, there were no significant ~~charges~~benefits or ~~benefits~~charges resulting from changes in estimates for closure and post-closure liabilities.

~~New asset retirement obligations incurred during the first six months of 2022 were discounted at the credit-adjusted risk-free rate of 5.37%.~~

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(11) REMEDIAL LIABILITIES

The changes to remedial liabilities from January 1, ~~2022~~2023 through June 30, ~~2022~~2023 were as follows (in thousands):


		Remedial Liabilities for Landfill Sites		Remedial Liabilities for Inactive Sites		Remedial Liabilities (Including Superfund) for Non-Landfill Operations		Total			Remedial Liabilities for Landfill Sites		Remedial Liabilities for Inactive Sites		Remedial Liabilities (Including Superfund) for Non-Landfill Operations		Total
Balance at January 1, 2022		$	1,780	$	59,787	$	50,306	$	111,873
Liability assumed in acquisition of real estate		—		—		13,073		13,073
Measurement period adjustment from a prior period acquisition		—		—		242		242
Balance at January 1, 2023										Balance at January 1, 2023	$	1,824	$	59,749	$	54,717	$	116,290

Accretion	Accretion	42		1,264		804		2,110		Accretion	44		1,304		808		2,156
Changes in estimates recorded to consolidated statement of operations	Changes in estimates recorded to consolidated statement of operations	1		731		124		856		Changes in estimates recorded to consolidated statement of operations	6		386		(140)		252
Expenditures	Expenditures	(25)		(1,676)		(2,579)		(4,280)		Expenditures	(26)		(1,966)		(4,830)		(6,822)
Currency translation and other	Currency translation and other	—		(9)		(209)		(218)		Currency translation and other	—		12		288		300
Balance at June 30, 2022		$	1,798	$	60,097	$	61,761	$	123,656
Balance at June 30, 2023										Balance at June 30, 2023	$	1,848	$	59,485	$	50,843	$	112,176

In the six months ended June 30, ~~2022,~~2023, there were no significant benefits or charges resulting from changes in estimates for remedial liabilities. The $13.1 million liability assumed in acquisition relates to real estate that the Company acquired in the first quarter of 2022. In purchasing the property, the Company assumed a known associated remedial liability, which was contemplated in the purchase price.

(12) FINANCING ARRANGEMENTS

Long-term Debt

The following table is a summary of the Company’s long-term debt (in thousands):


Current Portion of Long-Term Debt:	Current Portion of Long-Term Debt:	June 30, 2022		December 31, 2021		Current Portion of Long-Term Debt:	June 30, 2023		December 31, 2022
Secured senior term loans	Secured senior term loans	$	17,535	$	17,535	Secured senior term loans	$	10,000	$	10,000

Long-Term Debt:	Long-Term Debt:					Long-Term Debt:
Secured senior term loans due June 30, 2024 ("2024 Term Loans")	Secured senior term loans due June 30, 2024 ("2024 Term Loans")	$	708,323	$	712,091	Secured senior term loans due June 30, 2024 ("2024 Term Loans")	$	—	$	613,975
Secured senior term loans due October 8, 2028 ("2028 Term Loans")	Secured senior term loans due October 8, 2028 ("2028 Term Loans")	985,000		990,000		Secured senior term loans due October 8, 2028 ("2028 Term Loans")	975,000		980,000
Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes")	Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes")	545,000		545,000		Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes")	545,000		545,000
Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes")	Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes")	300,000		300,000		Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes")	300,000		300,000
Unsecured senior notes, at 6.375%, due February 1, 2031 ("2031 Notes")						Unsecured senior notes, at 6.375%, due February 1, 2031 ("2031 Notes")	500,000		—

Long-term debt, at par	Long-term debt, at par	$	2,538,323	$	2,547,091	Long-term debt, at par	$	2,320,000	$	2,438,975
Unamortized debt issuance costs and discount, net	Unamortized debt issuance costs and discount, net	(27,360)		(30,067)		Unamortized debt issuance costs and discount, net	(25,694)		(24,147)
Long-term debt, at carrying value	Long-term debt, at carrying value	$	2,510,963	$	2,517,024	Long-term debt, at carrying value	$	2,294,306	$	2,414,828

Financing Activities

The Company's significant financing arrangements are described in Note 12, "Financing Arrangements," in the Company's Annual Report on Form 10-K for the year ended December 31, 2022 and there have been no material changes to the arrangements described therein. As previously disclosed, on January 24, 2023, the Company completed a private placement of $500.0 million aggregate principal amount of unsecured senior notes which mature on February 1, 2031 (collectively referred to with the 2027 and 2029 Notes as the "Notes"). The proceeds from the 2031 Notes, along with a $114.0 million borrowing on the Company's revolving credit facility and available cash, were used to repay the $614.0 million outstanding principal amount of the 2024 Term Loans. In connection with the repayment, the Company recognized a loss on early extinguishment of debt of $2.4 million in the first quarter of 2023.

The Company maintains a $400.0 million revolving credit facility under which the Company had no outstanding loan balance as of June 30, 2023 and December 31, 2022. During the three months ended March 31, 2023, the Company borrowed $114.0 million on the revolving credit facility to repay the outstanding principal amount of the 2024 Term Loans. The Company repaid the full amount of the borrowing on May 26, 2023. As of June 30, 2023, the Company had $274.8 million available to borrow under the revolving credit facility and outstanding letters of credit were $125.2 million. Subject to certain conditions, this credit facility will expire in October 2025.

As of June 30, ~~2022~~2023 and December 31, ~~2021,~~2022, the estimated fair value of the Company’s outstanding long-term debt, including the current portion, was ~~$2.5~~$2.3 billion and ~~$2.6~~$2.4 billion, respectively. The Company’s estimates of fair value of its long-term debt, including the current portion, are based on quoted market prices or other available market data which are considered Level 2

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measures according to the fair value hierarchy. Level 2 utilizes quoted market prices in markets that are not active, broker or dealer ~~quotations~~quotation or alternative pricing sources with reasonable levels of price transparency for similar assets and liabilities.

~~The Company maintains~~Upon the phase-out of LIBOR as a ~~$400.0 million revolving credit facility under which~~referenced rate, the Company ~~had no outstanding loan balances as~~has transitioned all of ~~June 30, 2022 and December 31, 2021.~~its variable rate debt to a successor rate, namely Term SOFR. As of June 30, ~~2022,~~2023, after taking into account the interest rate swaps discussed under the "Cash Flow Hedges" header below, the Company's variable rate debt consists of $385.0 million of the 2028 Term Loans and any borrowings under the revolving credit facility.

In accordance with the October 8, 2021 amendment to the credit agreement, the 2028 Term Loan will generally bear interest at a rate of Term SOFR plus an adjustment of 0.11448%, based upon one-month Term SOFR. The Term Loan Agreement also provides for Term SOFR adjustments for other interest periods, however the Company ~~had $290.6 million available~~expects to ~~borrow~~elect the one-month Term SOFR for interest payments on that debt. The 2.00% margin applicable to the 2028 Term Loans prior to the phase-out of LIBOR also remains applicable to the interest payments under Term SOFR, so in total, the 2028 Term Loan will bear interest at Term SOFR plus 2.11448%. The Company expects these changes will not be material to future financial results.

On April 28, 2023, the Company entered into an amendment to the credit agreement for the revolving credit facility. As amended, the terms of the agreement are substantially the same as prior to the amendment except for certain updates required to transition the agreement to include a defined LIBOR successor rate. Under the amended agreement, borrowings under the revolving credit facility will bear interest at a rate, at the Company’s option, of either (i) “Term SOFR” (as defined in the amended agreement) plus an applicable margin ranging from 1.50% to 1.75% per annum based primarily on the level of the Company’s average liquidity for the most recent 30 day period or (ii) Bank of America's base rate plus an applicable margin ranging from 0.50% to 0.75% per annum based primarily on such average liquidity. The amended agreement also continues to provide (i) for an unused line fee payable to the lenders, calculated on the then unused portion of the lenders’ $400.0 million maximum commitments, ranging from 0.25% to 0.375% per annum of the unused commitment, and (ii) for outstanding letters of credit, ~~were $109.4 million. Subject~~a fee payable to ~~certain conditions, this credit facility~~the lenders equal to the then applicable margin for Term SOFR borrowings described above, and to the issuing banks a standard fronting fee and customary fees and charges in connection with all amendments, extensions, draws and other actions with respect to letters of credit. The Company expects these changes will ~~expire in October 2025.~~not be material to future financial results.

Cash Flow Hedges

The ~~Company’s~~Company's strategy to hedge against fluctuations in variable interest rates involves entering into interest rate derivative agreements.

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~~Although the interest rates on the Term Loans are variable, the~~The Company ~~has~~ effectively fixed the interest rate on $350.0 million principal of the previously outstanding 2024 Term Loans by entering into interest rate swap agreements in 2018 with a notional amount of $350.0 million ("2018 Swaps"). ~~Under~~On January 24, 2023, concurrently with the ~~terms~~repayment of the ~~2018 Swaps,~~2024 Term Loans, the Company ~~receives~~received a settlement payment of $8.3 million from the counterparties. As a result of the settlement, the Company also reclassified the amounts previously deferred in accumulated other comprehensive loss and recognized a settlement gain of $8.3 million in interest ~~based on~~expense during the ~~one-month LIBOR index and pays interest at a weighted average rate of approximately 2.92%, resulting in a fixed effective annual interest rate of approximately 4.67%.~~three months ended March 31, 2023.

In ~~January~~ 2022, the Company entered into interest rate swap agreements ~~("2022 Swaps")~~ with a notional amount of $600.0 million ("2022 Swaps") to effectively fix the interest rate on $600.0 million principal of the outstanding 2028 Term Loans. Under the terms of the 2022 Swaps' agreements, the Company ~~will receive~~receives interest based upon the variable rates on the 2028 Term Loans and ~~pay~~pays a fixed amount of interest. The fixed rate on these instruments is 0.931% through June 30, 2023 ~~and then increases to 1.9645% from July 1, 2023 through September 30, 2027. The variable~~which, together with the 2.00% interest rate margin for borrowings on ~~these instruments is designed to both mirror~~ the ~~current~~ 2028 Term Loan interest payments and the successor rate upon the eventual sunsetting of the LIBOR rate. Under the terms of the 2022 Swaps, the Company currently receives interest based on the one-month LIBOR index and pays interest at a weighted average rate of 0.931%, resultingLoans, results in ~~a fixed~~an effective annual interest rate of approximately 2.931%. The fixed rate on these instruments increased to 1.9645% on July 1, 2023 and the variable rate became linked to Term SOFR to mirror the variable interest payments for the 2028 Term Loans. Including the 2.00% interest rate margin for borrowings on the 2028 Term Loans and the 0.11448% SOFR adjustment per the 2028 Term Loans, the effective annual interest rate of this $600.0 million is now 4.07898%. The 2022 Swaps expire September 30, 2027.

~~The~~At the inception of these instruments, the Company ~~has~~ designated both the 2018 Swaps and the 2022 Swaps (collectively referred to as the “Swaps”) as cash flow hedges. The Company recognizes the fair value of the derivative instruments by counterparty as either a net asset, included in Other Assets, or net liability, included in Accrued expenses and other current liabilities, on the consolidated balance sheets. As of June 30, ~~2022,~~2023, the Company recorded a ~~related~~ derivative asset with a fair value of ~~$33.7 million. As~~$49.1 million comprised only of the 2022 Swaps as the 2018 Swaps were settled during the period, as noted above. The balance of the derivative asset as of December 31, ~~2021, the derivative liability totaled $17.4 million. The change in the fair value~~2022 was $60.6 million, which included both of the ~~interest rate swap liability is mainly due to the passage of time and changes in future interest rate expectations.~~

The fair value of the Swaps are measured using discounted cash flow valuation methodologies based upon the yield curves of the relevant variable rate indexes that are observable at commonly quoted intervals for the term of the Swaps and as such is considered a Level 2 measure according to the fair value hierarchy.Swaps.

No ineffectiveness has been identified on the Swaps and, therefore the change in fair value is recorded in stockholders' equity as a component of accumulated other comprehensive loss. Amounts are reclassified from accumulated other comprehensive loss into interest expense on the consolidated statement of operations in the same period or periods during which the hedged transactions affect earnings.

~~(13) INCOME TAXES~~

The Company records a tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. Losses from jurisdictions for which no benefit can be recognized and the income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period. The estimated annual effective tax rate may be significantly impacted by projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised. The Company’s effective tax rate for the three and six months ended June 30, 2022 was 24.0% and 25.0%, compared to 25.9% and 27.3%, respectively, for the comparable periods in 2021.

As of June 30, 2022 and December 31, 2021, the Company had recorded $3.6 million and $5.5 million, respectively, of gross liabilities for unrecognized tax benefits and $1.9 million and $2.3 million, respectively, of accrued interest.

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~~(14)~~(13) EARNINGS PER SHARE

The following are computations of basic and diluted earnings per share (in thousands, except per share amounts):


		Three Months Ended				Six Months Ended					Three Months Ended				Six Months Ended
		June 30,				June 30,					June 30,				June 30,
		2022		2021		2022		2021			2023		2022		2023		2022
Numerator for basic and diluted earnings per share:	Numerator for basic and diluted earnings per share:									Numerator for basic and diluted earnings per share:
Net income	Net income	$	148,157	$	67,075	$	193,471	$	88,811	Net income	$	115,766	$	148,157	$	188,167	$	193,471

Denominator:	Denominator:									Denominator:
Weighted-average basic shares outstanding	Weighted-average basic shares outstanding	54,318		54,529		54,362		54,625		Weighted-average basic shares outstanding	54,092		54,318		54,084		54,362
Dilutive effect of outstanding stock awards	Dilutive effect of outstanding stock awards	279		325		277		320		Dilutive effect of outstanding stock awards	356		279		338		277
Dilutive shares outstanding	Dilutive shares outstanding	54,597		54,854		54,639		54,945		Dilutive shares outstanding	54,448		54,597		54,422		54,639

Basic earnings per share:	Basic earnings per share:	$	2.73	$	1.23	$	3.56	$	1.63	Basic earnings per share:	$	2.14	$	2.73	$	3.48	$	3.56

Diluted earnings per share:	Diluted earnings per share:	$	2.71	$	1.22	$	3.54	$	1.62	Diluted earnings per share:	$	2.13	$	2.71	$	3.46	$	3.54

For the three months ended June 30, 2023 and 2022, ~~and 2021,~~ all ~~then~~ outstanding performance awards and restricted stock awards were included in the calculation of diluted earnings per share except for ~~104,700~~105,560 and ~~33,708,~~104,700, respectively, of performance stock awards for which the performance criteria were not attained at the reporting ~~dates and~~dates. For the three months ended June 30, 2023 there were no restricted stock awards excluded from the calculation of diluted earnings per share. For the three months ended June 30, 2022 there were 8,376 ~~and 500, respectively, of~~ restricted stock awards which were excluded from the calculation of diluted earnings per share as their inclusion would have an antidilutive effect.

For the six months ended June 30, 2023 and 2022, ~~and 2021,~~ all ~~then~~ outstanding performance awards and restricted stock awards were included in the calculation of diluted earnings per share except for ~~104,700~~105,560 and ~~33,708,~~104,700, respectively, of performance stock awards for which the performance criteria were not attained at the reporting dates and ~~25,876~~19,839 and ~~12,604,~~25,876, respectively, of restricted stock awards which were excluded as their inclusion would have an antidilutive effect.

~~(15)~~(14) ACCUMULATED OTHER COMPREHENSIVE LOSS

The changes in accumulated other comprehensive loss by component and related tax impacts for the six months ended June 30, ~~2022~~2023 were as follows (in thousands):

Foreign Currency Translation Unrealized (Loss) Gain on Available-For-Sale Securities Unrealized (Loss) Gain on Interest Rate Hedge Unrealized Loss on Unfunded Pension Liability Total
Balance at January 1, 2022 $ (177,824) $ (150) $ (17,383) $ (655) $ (196,012)
Other comprehensive (loss) income before reclassifications (7,326) (830) 45,685 10 37,539
Amounts reclassified out of accumulated other comprehensive loss — — 5,358 — 5,358
Tax benefit (provision) — 174 (9,761) — (9,587)
Other comprehensive (loss) income (7,326) (656) 41,282 10 33,310
Balance at June 30, 2022 $ (185,150) $ (806) $ 23,899 $ (645) $ (162,702)


	Foreign Currency Translation Adjustments		Unrealized Loss on Available-For-Sale Securities		Unrealized Gain on Fair Value of Interest Rate Hedges		Unrealized Loss on Unfunded Pension Liability		Total
Balance at January 1, 2023	$	(209,339)	$	(563)	$	43,058	$	(337)	$	(167,181)
Other comprehensive income (loss) before reclassifications	8,236		276		8,607		(7)		17,112
Amounts reclassified out of accumulated other comprehensive loss	—		—		(20,175)		—		(20,175)
Tax (provision) benefit	—		(58)		4,336		—		4,278
Other comprehensive income (loss)	8,236		218		(7,232)		(7)		1,215
Balance at June 30, 2023	$	(201,103)	$	(345)	$	35,826	$	(344)	$	(165,966)

The amount ~~realized~~realized in the ~~consolidated~~consolidated statement of operations during the three and six months ended June 30, ~~2022~~2023 which was reclassified out of ~~accumulated~~accumulated other ~~comprehensive~~comprehensive loss was as follows (in thousands):

Other Comprehensive (Loss) Income Component For the Three Months Ended June 30, 2022 For the Six Months Ended June 30, 2022 Location
Unrealized loss on interest rate hedge $ (2,164) $ (5,358) Interest expense, net of interest income


Component of Accumulated Other Comprehensive Loss	For the Three Months Ended June 30, 2023		For the Six Months Ended June 30, 2023		Location
Unrealized Gain on Fair Value of Interest Rate Hedges (1)	$	6,049	$	20,175	Interest expense, net of interest income

________________

(1) For the six months ended June 30, 2023, the balance is inclusive of an $8.3 million gain realized in connection with the settlement of the 2018 Swaps. For more information on this transaction, see Note 12, "Financing Arrangements."

~~(16)~~

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(15) STOCK-BASED COMPENSATION

Total stock-based compensation cost charged to selling, general and administrative expenses for the three and six months ended June 30, 2023 was $4.5 million and $10.5 million, respectively. Total stock-based compensation cost charged to selling, general and administrative expenses for the three and six months ended June 30, 2022 was $6.8 million and $12.5 million, respectively. ~~Total~~The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation ~~cost charged to selling, general and administrative expenses~~expense for the three and six months ended June 30, ~~2021~~2023 was ~~$3.3~~$0.6 million and ~~$6.8~~$1.7 million,

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respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation expense for the three and six months ended June 30, 2022 was $1.2 million and $2.3 million, respectively. The total income tax benefit recognized in the consolidated statements of operations from stock-based compensation expense for the three and six months ended June 30, 2021 was $0.8 million and $1.5 million, respectively.

Restricted Stock Awards

The following table summarizes information about restricted stock awards for the six months ended June 30, ~~2022:~~2023:


Restricted Stock	Restricted Stock	Number of Shares	Weighted Average Grant-Date Fair Value		Restricted Stock	Number of Shares	Weighted Average Grant-Date Fair Value
Balance at January 1, 2022		452,197	$	76.88
Balance at January 1, 2023					Balance at January 1, 2023	427,142	$	84.64
Granted	Granted	137,697	93.00		Granted	151,318	134.07
Vested	Vested	(56,068)	75.94		Vested	(57,657)	85.30
Forfeited	Forfeited	(15,487)	82.65		Forfeited	(33,119)	102.51
Balance at June 30, 2022		518,339	81.09
Balance at June 30, 2023					Balance at June 30, 2023	487,684	$	98.69

As of June 30, ~~2022,~~2023, there was ~~$30.4~~$34.9 million of total unrecognized compensation cost arising from restricted stock awards. This cost is expected to be recognized over a weighted average period of ~~2.8~~3.1 years. The total fair value of restricted stock vested during the three and six months ended June 30, 2023 was $5.9 million and $8.1 million, respectively. The total fair value of restricted stock vested during the three and six months ended June 30, 2022 was $3.9 million and $5.6 ~~million, respectively. The total fair value of restricted stock vested during the three and six months ended June 30, 2021 was $4.9 million and $8.9~~ million, respectively.

Performance Stock Awards

Performance stock awards are subject to performance criteria established by the Compensation Committee of the Company's Board of Directors prior to or at the date of grant. The vesting of the performance stock awards is based on achieving targets currently based on revenue, Adjusted EBITDA ~~Adjusted EBITDA~~ Margin, Return on Invested Capital and Total Recordable Incident Rate. In addition, performance stock awards include continued service conditions.

The following table summarizes information about performance stock awards for the six months ended June 30, ~~2022:~~2023:


Performance Stock	Performance Stock	Number of Shares	Weighted Average Grant-Date Fair Value		Performance Stock	Number of Shares	Weighted Average Grant-Date Fair Value
Balance at January 1, 2022		169,757	$	85.56
Balance at January 1, 2023					Balance at January 1, 2023	213,679	$	91.62
Granted	Granted	154,172	92.64		Granted	119,382	130.77
Vested	Vested	(35,718)	86.14		Vested	(58,636)	92.49
Forfeited	Forfeited	(5,722)	87.14		Forfeited	(26,584)	114.37
Balance at June 30, 2022		282,489	89.32
Balance at June 30, 2023					Balance at June 30, 2023	247,841	$	107.83

As of June 30, ~~2022,~~2023, there was ~~$13.1~~$5.1 million of total unrecognized compensation cost arising from unvested performance stock awards deemed probable of vesting. No performance awards vested during the three months ended June 30, ~~2022~~2023 and June 30, ~~2021.~~2022. The total fair value of performance awards vested during the six months ended June 30, ~~2022~~2023 and June 30, ~~2021~~2022 was ~~$3.8~~$7.8 million and ~~$6.4~~$3.8 million, respectively.

~~(17)~~(16) COMMITMENTS AND CONTINGENCIES

~~Legal and Administrative Proceedings~~

The Company and its subsidiaries are subject to legal proceedings and claims arising in the ordinary course of business. Actions filed against the Company arise from commercial and employment-related claims including alleged class actions related to sales practices and wage and hour claims. The plaintiffs in these actions may be seeking damages or injunctive relief or both. These actions are in various jurisdictions and stages of proceedings, and some are covered in part by insurance. In addition, the Company’s waste management services operations are regulated by federal, state, provincial and local laws enacted to regulate discharge of

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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~~government authorities and other interested parties. The issues involved in such proceedings generally relate to alleged violations of

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existing permits and licenses or alleged responsibility 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 the prior owners of certain of the Company’s facilities shipped waste.

At June 30, ~~2022~~2023 and December 31, ~~2021,~~2022, the Company had recorded reserves of ~~$36.8~~$29.4 million and ~~$36.1~~$37.1 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. As of June 30, 2023 and December 31, 2022, the $29.4 million and $37.1 million, respectively, of reserves consisted of (i) $22.8 million and $24.1 million, respectively, related to pending legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $6.6 million and $13.0 million, respectively, primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses on the consolidated balance sheets.

In management's opinion, it is not reasonably possible that the potential liability beyond what has been recorded, if any, that may result from these actions, either individually or collectively, will have a material effect on ~~our~~the Company's financial position, results of operations or cash flows. The Company periodically adjusts the aggregate amount of these reserves when 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 June 30, 2022 and December 31, 2021, the $36.8 million and $36.1 million, respectively, of reserves consisted of (i) $24.1 million for both periods, related to pending legal~~

Legal or administrative proceedings, including Superfund liabilities, which were included in remedial liabilities on the consolidated balance sheets, and (ii) $12.7 million and $12.0 million, respectively, primarily related to federal, state and provincial enforcement actions, which were included in accrued expenses and other current liabilities on the consolidated balance sheets.Administrative Proceedings

As of June 30, ~~2022,~~2023, the ~~Company's~~ principal legal and administrative proceedings ~~were as follows:~~

~~Ville Mercier.~~ ~~In September 2002,~~in which the Company ~~acquired the stock of a subsidiary (the "Mercier Subsidiary")~~was involved, or which ~~owns a hazardous waste incinerator in Ville Mercier, Quebec (the "Mercier Facility"). The property adjacent~~had been terminated during 2023, relate 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 2 permits to dump organic liquids into lagoons on the property to a company unrelated to the Mercier Subsidiary. In 1999, Ville MercierSafety-Kleen product liability cases and 3 neighboring municipalities filed separate legal proceedings against the Mercier Subsidiary and the Government of Quebec. In 2012, the municipalities amended their existing statement of claim to seek $2.9 million (CAD) in general damages and $10.0 million (CAD) in punitive damages, plus interest and costs, as well as injunctive relief. Both the Government of Quebec and the Company have filed summary judgment motions against the municipalities. The parties are attempting to negotiate a resolution and hearings on the motions have been delayed. In September 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 more recent notice notifies the Mercier Subsidiary that, if the Mercier Subsidiary does not take certain remedial measures at the site, the Minister intends to undertake those measures at the site and claim direct and indirect costs related to such measures. The Company has accrued for costs expected to be incurred relative to the resolution of this matter and believes this matter will not have future material effect on its financial position, results of operations or cash flows.Superfund proceedings.

Safety-Kleen Product Liability ~~Cases.~~Cases: ~~On December 28, 2012, the Company acquired~~ Safety-Kleen, Inc. ("Safety-Kleen") ~~and thereby became subject to~~, which is a legal entity acquired by the ~~legal proceedings~~Company in which Safety-Kleen was a party on that date. In addition to certain Superfund proceedings in which Safety-Kleen has been named as a potentially responsible party as described below under “Superfund Proceedings,” Safety-Kleen2012, has been named as a defendant in ~~various~~certain product liability ~~lawsuits~~cases that are currently pending in various courts and jurisdictions throughout the United States. As of June 30, ~~2022, Safety-Kleen has been named in~~2023, there were approximately ~~60 outstanding~~63 proceedings (excluding cases which have been settled but not formally dismissed), wherein persons claim personal injury resulting from the use of Safety-Kleen's parts ~~washer~~cleaning equipment or cleaning products. These proceedings typically involve allegations that the solvent used in Safety-Kleen's parts ~~washer~~cleaning equipment contains contaminants and/or that Safety-Kleen's recycling process does not effectively remove the contaminants that become entrained in the solvent during their use. In addition, certain claimants assert that Safety-Kleen failed to warn adequately ~~warn~~ the product user of potential risks, including a historic failure to warn that solvent contains trace amounts of toxic or hazardous substances such as benzene.

The Company maintains insurance that it believes will provide coverage for these product liability claims (over amounts accrued for self-insured retentions and deductibles in certain limited cases), except for punitive damages to the extent not insurable under state law or excluded from insurance coverage. The Company also believes that these claims lack merit and historically has ~~historically~~ vigorously defended, and intends to continue to vigorously defend itself and the safety of its products against all of these claims. Such matters are subject to many uncertainties and outcomes are not predictable with assurance. Consequently, the Company is unable to ascertain the ultimate aggregate amount of monetary liability or financial impact with respect to these matters as of June 30, ~~2022.~~2023. From January 1, ~~2022~~2023 to June 30, ~~2022, 8~~2023, 14 product liability claims were settled or dismissed. Due to the nature of these claims and the related insurance, the Company did not incur any expense as insurance provided coverage in full for all such claims. Safety-Kleen may be named in similar, additional lawsuits in the future, including claims for which insurance coverage may not be available.

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Superfund ~~Proceedings~~

Proceedings:The Company has been notified that either the Company (which, since December 28, 2012, has included Safety-Kleen) 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 131 sites which are subject to or are proposed to become subject to proceedings under federal or state Superfund laws. Of the 131 Superfund related sites, ~~6 (including the BR Facility described below)~~six involve facilities that are now owned or leased by the Company and 125 involve third-party sites to which either the Company or the prior owners of certain of the Company’s facilities shipped ~~wastes.~~waste. Of the 125 third-party sites, 30 are now settled, 15 are currently requiring expenditures on remediation and 80 are not currently requiring expenditures on remediation.

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 indemnification obligations, 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,~~(if any) of the Company

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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,~~(if any) with prior owners, which may either benefit the Company or subject the Company to potential indemnification obligations. The Company believes its potential monetary liability could exceed $1.0 million at 3three of the 131 Superfund related sites.

~~BR Facility.~~ The Company acquired in 2002 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 U.S. Environmental Protection Agency ("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 storm water 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. In 2018, the Company completed performing corrective actions at the BR Facility under an order issued by the Louisiana Department of Environmental Quality and has also completed conducting the remedial investigation feasibility study for Devil's Swamp under the order issued by the EPA at which point the feasibility study, with several remedial alternatives, was submitted to the EPA for review. During 2020, the EPA signed a Record of Decision which defined the remediation alternative selected and approved by the EPA and in return, the Company increased the estimated remedial liability for this inactive site by $3.3 million. Changes in the natural landscape and/or new information identified during the remediation could impact this estimate; however, any such changes are not expected to have a future material effect on the Company's financial position, liquidity or results of operation.

~~Third-Party Sites.~~ Of the 125 third-party ~~Superfund~~ sites at which the Company has been notified it is a PRP or potential PRP or may have indemnification obligations, the Company has an indemnification ~~agreement~~agreements at a total of 17 sites. These agreements indemnify the Company (which now includes Safety-Kleen) with respect to any liability at the 17 sites for waste disposed prior to the Company's (or Safety-Kleen's) acquisition of the former subsidiaries of Waste Management and ~~McKesson.~~McKesson which had shipped waste to those sites. Accordingly, the indemnifying parties are paying all costs of defending those subsidiaries in those 17 cases, including legal fees and settlement costs. However, there can be no guarantee that the Company's ultimate liabilities for those 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. Except for ~~the~~those indemnification agreements ~~which the Company holds from ChemWaste and McKesson,~~discussed, the Company does not have an indemnity agreement with respect to any of the 125 third-party sites discussed above.

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 June 30, ~~2022 and December 31, 2021,~~2023 there were 2no proceedings for which the Company ~~reasonably~~ believes it is possible that the sanctions could equal or exceed $1.0 million. As of December 31, 2022, there was one proceeding for which the Company believed it was possible that the sanctions could equal or exceed $1.0 million. The Company believes that the fines or other penalties in ~~these~~this or any of the other regulatory proceedings will, ~~not,~~ individually or in the aggregate, not have a material effect on its financial condition, results of operations or cash flows.

~~(18)~~(17) SEGMENT REPORTING

Segment reporting is prepared on the same basis that the Company's chief ~~executive officer, who~~operating decision maker, which is a committee comprised of the Company's ~~chief operating decision maker,~~co-Chief Executive Officers, manages the business, makes operating decisions and assesses performance. The Company is managed and

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reports as 2two operating segments; (i) the Environmental Services segment and (ii) the Safety-Kleen Sustainability Solutions segment.

Third-party revenue is revenue billed to outside customers by a particular segment. Direct revenues is revenue allocated to the segment providing the product or service. Intersegment revenues represent the sharing of third-party revenues among the segments based on products and services provided by each segment as if the products and services were sold directly to the third-party. ~~Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers.~~ The intersegment revenues are shown net. The operations not managed through the Company’s operating segments described above are recorded as “Corporate Items.”

The following ~~table reconciles~~tables reconcile third-party revenues to direct revenues for the three and six months ended June 30, ~~2022~~2023 and ~~2021~~2022 (in thousands):


																For the Three Months Ended					For the Three Months Ended
		For the Three Months Ended June 30, 2022				For the Three Months Ended June 30, 2021						June 30, 2023								June 30, 2022
		Third-party revenues		Intersegment revenues, net		Direct revenues		Third-party revenues		Intersegment revenues, net			Direct revenues			Third-Party Revenues		Intersegment Revenues (Expenses), net			Direct Revenues		Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues
Environmental Services	Environmental Services	$	1,084,506	$	6,237	$	1,090,743	$	723,147	$	950		$	724,097	Environmental Services	$	1,161,482	$	10,554		$	1,172,036	$	1,084,506	$	6,237	$	1,090,743
Safety-Kleen Sustainability Solutions	Safety-Kleen Sustainability Solutions	271,727		(6,237)		265,490		203,232		(950)			202,282		Safety-Kleen Sustainability Solutions	236,302		(10,554)			225,748		271,727		(6,237)		265,490
Corporate Items	Corporate Items	79		—		79		79		—			79		Corporate Items	116		—			116		79		—		79
Total	Total	$	1,356,312	$	—	$	1,356,312	$	926,458	$	—		$	926,458	Total	$	1,397,900	$	—		$	1,397,900	$	1,356,312	$	—	$	1,356,312

For the Six Months Ended June 30, 2022 For the Six Months Ended June 30, 2021
Third-party revenues Intersegment revenues, net Direct revenues Third-party revenues Intersegment revenues, net Direct revenues
Environmental Services $ 2,025,304 $ 12,884 $ 2,038,188 $ 1,376,025 $ 2,674 $ 1,378,699
Safety-Kleen Sustainability Solutions 499,966 (12,884) 487,082 358,423 (2,674) 355,749
Corporate Items 151 — 151 158 — 158
Total $ 2,525,421 $ — $ 2,525,421 $ 1,734,606 $ — $ 1,734,606

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	For the Six Months Ended				For the Six Months Ended
	June 30, 2023				June 30, 2022
	Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues		Third-Party Revenues		Intersegment Revenues (Expenses), net		Direct Revenues
Environmental Services	$	2,222,464	$	20,313	$	2,242,777	$	2,025,304	$	12,884	$	2,038,188
Safety-Kleen Sustainability Solutions	482,600		(20,313)		462,287		499,966		(12,884)		487,082
Corporate Items	223		—		223		151		—		151
Total	$	2,705,287	$	—	$	2,705,287	$	2,525,421	$	—	$	2,525,421

The primary financial measure by which the Company evaluates the performance of its segments is ~~"Adjusted~~Adjusted EBITDA," which consists of net income plus accretion of environmental liabilities, stock-based compensation, depreciation and amortization, net interest expense, loss on early extinguishment of debt and provision for income taxes and excludes other gains, losses orand non-cash charges not deemed representative of fundamental segment results and other ~~(income) expense,~~income (expense), net. Transactions between the segments are accounted for at the Company’s best estimate based on similar transactions with outside customers.

The following table presents Adjusted EBITDA information used by management by reported segment (in thousands):


		For the Three Months Ended				For the Six Months Ended					For the Three Months Ended				For the Six Months Ended
		June 30,				June 30,					June 30,				June 30,
		2022		2021		2022		2021			2023		2022		2023		2022
Adjusted EBITDA:	Adjusted EBITDA:									Adjusted EBITDA:
Environmental Services	Environmental Services	$	269,341	$	176,041	$	452,943	$	316,295	Environmental Services	$	305,622	$	269,341	$	533,967	$	452,943
Safety-Kleen Sustainability Solutions	Safety-Kleen Sustainability Solutions	97,010		63,314		148,887		94,946		Safety-Kleen Sustainability Solutions	53,415		97,010		94,878		148,887
Corporate Items	Corporate Items	(57,281)		(51,584)		(112,501)		(94,019)		Corporate Items	(71,531)		(57,281)		(126,201)		(112,501)
Total	Total	309,070		187,771		489,329		317,222		Total	287,506		309,070		502,644		489,329
Reconciliation to Consolidated Statements of Operations:	Reconciliation to Consolidated Statements of Operations:									Reconciliation to Consolidated Statements of Operations:
Accretion of environmental liabilities	Accretion of environmental liabilities	3,197		2,873		6,353		5,826		Accretion of environmental liabilities	3,486		3,197		6,893		6,353
Stock-based compensation	Stock-based compensation	6,835		3,305		12,547		6,785		Stock-based compensation	4,500		6,835		10,518		12,547
Depreciation and amortization	Depreciation and amortization	87,868		71,592		172,166		143,755		Depreciation and amortization	89,697		87,868		174,455		172,166
Income from operations	Income from operations	211,170		110,001		298,263		160,856		Income from operations	189,823		211,170		310,778		298,263
Other (income) expense, net		(1,265)		1,480		(1,969)		2,708
Other expense (income), net										Other expense (income), net	1,283		(1,265)		1,167		(1,969)
Loss on early extinguishment of debt										Loss on early extinguishment of debt	—		—		2,362		—
Gain on sale of business	Gain on sale of business	(8,864)		—		(8,864)		—		Gain on sale of business	—		(8,864)		—		(8,864)

Interest expense, net of interest income	Interest expense, net of interest income	26,256		18,051		51,273		35,969		Interest expense, net of interest income	30,072		26,256		50,704		51,273
Income before provision for income taxes	Income before provision for income taxes	$	195,043	$	90,470	$	257,823	$	122,179	Income before provision for income taxes	$	158,468	$	195,043	$	256,545	$	257,823

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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 Form 10-Q contains forward-looking statements, which are generally identifiable by use of the words "believes," "expects," "intends," "anticipates," "plans to," "seeks," "should," "estimates," "projects," "may," "likely" or similar expressions. Such statements may include, but are not limited to, statements about future financial and operating results, the Company's plans, objectives, expectations and intentions and other statements that are not historical facts. Forward-looking statements are neither historical facts nor assurances of future performance. Such statements are based upon the beliefs and expectations of Clean Harbors' management as of this date only and are subject to certain risks and uncertainties that could cause actual results to differ materially, including, without limitation, those items identified as "Risk Factors,” in this report under Item 1A and in our Annual Report on Form 10-K filed with the Securities and Exchange Commission ("SEC") on ~~February 23, 2022,~~March 1, 2023, and in other documents we file from time to time with the SEC. Therefore, readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management’s opinions only as of the date hereof. Our actual results and financial condition may differ materially from those indicated in the forward-looking statements. Clean Harbors undertakes no obligation to revise or publicly release the results of any revision to these forward-looking statements other than through its filings with the SEC, which may be viewed in the "Investors" section of the Clean Harbors website.

Overview

We are North America’s leading provider of environmental and industrial services supporting our customers in finding environmentally responsible solutions to further their sustainability goals in today's world. Everywhere industry meets the environment, we strive to provide eco-friendly products and services that protect and restore North America's natural environment. We believe we operate, in the aggregate, the largest number of hazardous waste incinerators, landfills and treatment, storage and disposal facilities ("TSDFs") in North America. We serve over 300,000 customers, including the majority of Fortune 500 ~~companies. This diverse customer base includes the~~companies, across various markets including chemical ~~energy,~~and manufacturing, ~~and additional markets,~~ as well as numerous government agencies. These customers rely on us to deliver a broad range of services including but not limited to end-to-end hazardous waste management, emergency response, industrial cleaning and maintenance and recycling services. We are also the largest re-refiner and recycler of used oil in North America and the largest provider of parts ~~washer~~cleaning and related environmental services to commercial, industrial and automotive customers in North America.

Performance of our segments is evaluated on several factors of which the primary financial measure is Adjusted EBITDA, as reconciled to our net income and described more fully below. The following is a discussion of how management evaluates its segments in regards to other factors including key performance indicators that management uses to assess the segments’ results, as well as certain macroeconomic trends and influences that impact each reportable segment:

•Environmental Services - Environmental Services segment results are predicated upon ~~customer~~the demand by our customers for ~~waste~~our wide variety of services, waste volumes ~~generated~~managed by delivering such services and project work for which responsible waste handling and/or disposal is required. Environmental Services results are also impacted by the demand for planned and unplanned industrial related cleaning and maintenance services at customer sites, ~~and~~ environmental cleanup services on a scheduled or emergency basis, including response to ~~national~~large scale events such as major chemical spills, natural disasters, or other ~~events~~instances where immediate and specialized services are ~~required, including our contagion disinfection, decontamination and disposal services. With the addition of~~required. The Environmental Services segment results include the Safety-Kleen branches' core environmental service offerings ~~(e.g.~~of containerized waste disposal, parts washer and vacuum ~~services), the Environmental Services~~services. These results are ~~further impacted~~driven by the volumes of waste collected from these customers, the overall number of parts washers placed at customer sites and the demand for and frequency of other offered services. In managing the business and evaluating performance, management tracks the volumes and mix of waste handled and disposed of or recycled, generally through our incinerators, TSDFs and landfills, the utilization rates of our incinerators, equipment and workforce, including billable hours, and the number of parts washer services performed, ~~among~~and pricing realized by our business and peer companies as well as other key metrics. Levels of activity and ultimate performance associated with this segment can be impacted by several factors including overall U.S. GDP, U.S. industrial production, economic conditions in the ~~automotive,~~chemical, manufacturing and ~~other industrial~~automotive markets including efforts and economic incentives to reshore operations to the U.S., available capacity at waste disposal outlets, weather conditions, efficiency of our operations, technology, changing regulations, competition, market pricing of our services, costs incurred to deliver our services and the management of our related operating costs.

•Safety-Kleen Sustainability Solutions - Safety-Kleen Sustainability Solutions segment results are impacted by our customers' demand for high-quality, environmentally responsible recycled oil products and their demand for our related service ~~offerings~~ and ~~products.~~product offerings. Safety-Kleen Sustainability Solutions offers high quality recycled base and blended oil

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products, including our KLEEN+ brand of Group II+ base oils, ~~and various blended oil products~~ to end users including fleet customers, distributors and manufacturers of oil products.

~~Table of Contents~~

Segment results are impacted by market pricing, overall demand ~~as well as product~~and the mix ~~as it relates to these~~of our oil ~~products.~~products sales. Segment results are also predicated on the demand for ~~the~~ Safety-Kleen Sustainability ~~Solutions~~Solutions' other product and service offerings including collection services for used oil, used oil filters and other automotive fluids. These fluid collections are used as feedstock in our oil re-refining to ~~make~~produce our base and blended oil products and our recycled automotive related fluid products or are integrated into the Clean Harbors' recycling and disposal network. In operating the business and evaluating performance, management tracks the volumes and relative percentages of base and blended oil sales along with various pricing metrics associated with the commodity driven ~~margin. Management also tracks~~margin between product pricing and the ~~volumes and pricing~~overall costs associated with the collection of used ~~oil and automotive fluid collections.~~oil. Levels of activity and ultimate performance associated with this segment can be impacted by economic conditions in the automotive services and manufacturing markets, efficiency of our operations, technology, weather conditions, changing regulations, competition and the management of our related operating ~~costs and the availability of raw materials including used oil and additives.~~costs. Costs incurred in connection with the collection of used oil and other raw materials associated with the segment’s oil related products can also be ~~volatile.~~volatile and can be impacted by global events and their relative impact on commodity products and pricing. The overall market price of oil and regulations that change the possible usage of used oil ~~including the International Maritime Organization's 2020 regulation ("IMO 2020") and other regulations related to the~~or burning of used ~~motor~~ oil as a fuel, ~~both~~ impact the premium the segment can charge for used oil collections.

Highlights

Total direct revenues for the three and six months ended June 30, ~~2022~~2023 were $1,397.9 million and $2,705.3 million, compared with $1,356.3 million and $2,525.4 ~~million, compared with $926.5 million and $1,734.6~~ million for the three and six months ended June 30, ~~2021.~~2022. Our Environmental Services segment direct revenues increased ~~$366.6~~$81.3 million and ~~$659.5~~$204.6 million or ~~50.6%~~7.5% and ~~47.8%~~10.0% from the comparable periods in ~~2021. Our~~2022 driven by continued demand for our services and growth from the recent acquisition of ~~HydroChemPSC~~Thompson Industrial Services, LLC ("Thompson Industrial") on October 8, 2021, contributed to increases in both our industrial services and field and emergency response service offerings within the Environmental Services segment. The sales and operations of HydroChemPSC have been fully integrated into the Environmental Services segment and we estimate that for the three and six months ended June 30, 2022, total revenues from the HydroChemPSC business were approximately $207.9 million and $392.0 million, respectively. Core organic growth within the Environmental Services segment also contributed to the overall increases in direct revenues for the segment in 2022 as compared to the comparable periods in 2021.March 31, 2023. In the three and six months ended June 30, ~~2022,~~2023, our Safety-Kleen Sustainability Solutions segment direct revenues ~~increased $63.2~~decreased $39.7 million and ~~$131.3~~$24.8 million or ~~31.2%~~15.0% and ~~36.9%~~5.1% from the comparable periods in ~~2021 predominately~~2022, due to ~~higher~~lower market-based pricing ofon our base ~~and blended~~ oil ~~products.~~product sales. The segment has increased the pricing on our collection of used oil services. Foreign currency translation of our Canadian operations negatively impacted our consolidated direct revenues by ~~$7.3~~$8.5 million and $18.6 million in the three and six months ended June 30, ~~2022.~~2023.

In the three and six months ended June 30, 2022, costs have increased in both the Environmental Services and Safety-Kleen Sustainability Solutions segments when comparing to the prior year given the increase in business levels, revenue mix, inflationary pressures seen across several cost categories and supply chain constraints. Our business began seeing the impact of macroeconomic factors including inflationary pressures and supply chain constraints in 2021 and these factors continue to impact the business operations. Supply chain challenges for additives and other materials used in the oil re-refining process have delayed production, added costs and shifted the product mix within our Safety-Kleen Sustainability Solutions segment. Similarly within the Environmental Services segment, supply chain challenges have delayed fleet and equipment delivery, increasing rental and external transportation costs.

Both segments have seen the impact of inflationary pressures, most notably in labor and the cost of certain supplies used in the operations of our businesses, including fuel related costs. In recent quarters, we have executed upon pricing strategies, including fuel surcharges, and cost control initiatives to mitigate, to the greatest extent possible, the impact of these inflationary pressures. As a result of these focused efforts, costs as a percentage of direct revenues for the three months ended June 30, 2022 improved when compared to previous quarters also impacted by these inflationary pressures.

~~We reported income~~Income from operations for the three and six months ended June 30, ~~2022 of~~2023 was $189.8 million and $310.8 million, compared with $211.2 million and $298.3 ~~million, compared with $110.0 million and $160.9~~ million in the three and six months ended June 30, ~~2021,~~2022, representing ~~increases~~a decrease of ~~$101.2 million~~10.1% and ~~$137.4 million.~~an increase of 4.2%, respectively. Net income for the three and six months ended June 30, ~~2022~~2023 was ~~$148.2~~$115.8 million and ~~$193.5~~$188.2 million, compared with net income of ~~$67.1~~$148.2 million and ~~$88.8~~$193.5 million in the three and six months ended June 30, ~~2021,~~2022, representing ~~increases~~decreases of ~~$81.1 million~~21.9% and ~~$104.7 million.~~2.7%, respectively.

Adjusted EBITDA, which is the primary financial measure by which we evaluate our segments, ~~are evaluated, increased 64.6%~~decreased 7.0% to $287.5 million in the three months ended June 30, 2023 from $309.1 million in the three months ended June 30, 2022 ~~from $187.8 million~~predominately due to lower revenue in the ~~three~~Safety-Kleen Sustainability Solutions segment. For the six months ended June 30, ~~2021 and~~2023, Adjusted EBITDA increased ~~54.3% to~~2.7% from $489.3 million in the six months ended June 30, 2022 ~~from $317.2~~to $502.6 million in the six months ended June 30, ~~2021. This improved performance was driven by~~2023 due to the increased revenue ~~levels in both segments noted above,~~and focused pricing initiatives in the Environmental Services segment's disposal network, strong spread management as it relates to the pricing of base oil products and used motor oil collection services in the Safety-Kleen Sustainability Solutions segment and cost control initiatives across the entire

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~~business.~~segment. Additional information regarding Adjusted EBITDA, which is a non-GAAP measure, including a reconciliation of Adjusted EBITDA to net income, appears below under "Adjusted EBITDA."

Net cash from operating activities for the six months ended June 30, ~~2022 was~~2023 increased $103.6 million from $132.0 million ~~as compared~~in 2022 to ~~net cash from operating activities of $265.4~~$235.6 million in ~~the comparable period of 2021.~~2023. Adjusted free cash flow, which management uses to measure our financial strength and ability to generate cash, was an ~~outflow~~inflow of ~~$13.0~~$34.2 million in the six months ended June 30, ~~2022~~2023 as compared to ~~positive adjusted free cash flow~~an outflow of ~~$176.9~~$13.0 million in the comparable period of ~~2021. These expected decreases~~2022. This change is due to increases in ~~our~~net cash ~~flows were the result of an increase in working capital arising~~ from ~~our significant growth in the business, comparatively higher incentive compensation and interest payments and higher levels of cash spending~~operating activities, partially offset by incremental spend on ~~the acquisition of~~ property, plant and equipment ~~partially offset by higher operating income.~~net of proceeds from sale and disposal of fixed assets. Additional information regarding adjusted free cash flow, which is a non-GAAP measure, including a reconciliation of adjusted free cash flow to net cash from operating activities, appears below under ""Adjusted Free Cash ~~Flow.~~Flow."

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Segment Performance

The primary financial measure by which we evaluate the performance of our segments is Adjusted ~~EBITDA, as described below under~~ ~~"Adjusted EBITDA"~~.EBITDA. The following table sets forth certain financial information associated with our results of operations for the three and six months ended June 30, ~~2022~~2023 and June 30, ~~2021~~2022 (in thousands, except percentages):


		Summary of Operations																					Summary of Operations
		For the Three Months Ended										For the Six Months Ended											For the Three Months Ended										For the Six Months Ended
		June 30, 2022			June 30, 2021			Change			% Change	June 30, 2022			June 30, 2021			Change			% Change		June 30, 2023			June 30, 2022			Change			% Change	June 30, 2023			June 30, 2022			Change			% Change
Direct Revenues(1):	Direct Revenues(1):																					Direct Revenues (1):
Environmental Services	Environmental Services	$	1,090,743		$	724,097		$	366,646		50.6%	$	2,038,188		$	1,378,699		$	659,489		47.8%	Environmental Services	$	1,172,036		$	1,090,743		$	81,293		7.5%	$	2,242,777		$	2,038,188		$	204,589		10.0%
Safety-Kleen Sustainability Solutions	Safety-Kleen Sustainability Solutions	265,490			202,282			63,208			31.2	487,082			355,749			131,333			36.9	Safety-Kleen Sustainability Solutions	225,748			265,490			(39,742)			(15.0)	462,287			487,082			(24,795)			(5.1)
Corporate Items	Corporate Items	79			79			—			N/M	151			158			(7)			N/M	Corporate Items	116			79			37			N/M	223			151			72			N/M
Total	Total	1,356,312			926,458			429,854			46.4	2,525,421			1,734,606			790,815			45.6	Total	1,397,900			1,356,312			41,588			3.1	2,705,287			2,525,421			179,866			7.1
Cost of Revenues(2):	Cost of Revenues(2):																					Cost of Revenues (2):
Environmental Services	Environmental Services	743,659			487,257			256,402			52.6	1,428,995			938,512			490,483			52.3	Environmental Services	781,251			743,659			37,592			5.1	1,534,611			1,428,995			105,616			7.4
Safety-Kleen Sustainability Solutions	Safety-Kleen Sustainability Solutions	151,020			123,025			27,995			22.8	303,037			231,401			71,636			31.0	Safety-Kleen Sustainability Solutions	153,901			151,020			2,881			1.9	329,758			303,037			26,721			8.8
Corporate Items	Corporate Items	3,790			7,604			(3,814)			N/M	9,826			8,509			1,317			N/M	Corporate Items	12,360			3,790			8,570			N/M	14,657			9,826			4,831			N/M
Total	Total	898,469			617,886			280,583			45.4	1,741,858			1,178,422			563,436			47.8	Total	947,512			898,469			49,043			5.5	1,879,026			1,741,858			137,168			7.9
Selling, General & Administrative Expenses:	Selling, General & Administrative Expenses:																					Selling, General & Administrative Expenses:
Environmental Services	Environmental Services	77,743			60,799			16,944			27.9	156,250			123,892			32,358			26.1	Environmental Services	85,163			77,743			7,420			9.5	174,199			156,250			17,949			11.5
Safety-Kleen Sustainability Solutions	Safety-Kleen Sustainability Solutions	17,460			15,943			1,517			9.5	35,158			29,402			5,756			19.6	Safety-Kleen Sustainability Solutions	18,432			17,460			972			5.6	37,651			35,158			2,493			7.1
Corporate Items	Corporate Items	60,405			47,364			13,041			27.5	115,373			92,453			22,920			24.8	Corporate Items	63,787			60,405			3,382			5.6	122,285			115,373			6,912			6.0
Total	Total	155,608			124,106			31,502			25.4	306,781			245,747			61,034			24.8	Total	167,382			155,608			11,774			7.6	334,135			306,781			27,354			8.9
Adjusted EBITDA:	Adjusted EBITDA:																					Adjusted EBITDA:
Environmental Services	Environmental Services	269,341			176,041			93,300			53.0	452,943			316,295			136,648			43.2	Environmental Services	305,622			269,341			36,281			13.5	533,967			452,943			81,024			17.9
Safety-Kleen Sustainability Solutions	Safety-Kleen Sustainability Solutions	97,010			63,314			33,696			53.2	148,887			94,946			53,941			56.8	Safety-Kleen Sustainability Solutions	53,415			97,010			(43,595)			(44.9)	94,878			148,887			(54,009)			(36.3)
Corporate Items	Corporate Items	(57,281)			(51,584)			(5,697)			(11.0)	(112,501)			(94,019)			(18,482)			(19.7)	Corporate Items	(71,531)			(57,281)			(14,250)			(24.9)	(126,201)			(112,501)			(13,700)			(12.2)
Total	Total	$	309,070		$	187,771		$	121,299		64.6%	$	489,329		$	317,222		$	172,107		54.3%	Total	$	287,506		$	309,070		$	(21,564)		(7.0)%	$	502,644		$	489,329		$	13,315		2.7%
Adjusted EBITDA as a % of Direct Revenues:	Adjusted EBITDA as a % of Direct Revenues:																					Adjusted EBITDA as a % of Direct Revenues:
Environmental Services		24.7		%	24.3		%	0.4		%		22.2		%	22.9		%	(0.7)		%
Safety-Kleen Sustainability Solutions		36.5		%	31.3		%	5.2		%		30.6		%	26.7		%	3.9		%
Corporate Items		N/M			N/M			N/M				N/M			N/M			N/M
Environmental Services (3)																						Environmental Services (3)	26.1		%	24.7		%	1.4		%		23.8		%	22.2		%	1.6		%
Safety-Kleen Sustainability Solutions(3)																						Safety-Kleen Sustainability Solutions(3)	23.7		%	36.5		%	(12.8)		%		20.5		%	30.6		%	(10.1)		%
Corporate Items (4)																						Corporate Items (4)	(5.1)		%	(4.2)		%	(0.9)		%		(4.7)		%	(4.5)		%	(0.2)		%
Total	Total	22.8		%	20.3		%	2.5		%		19.4		%	18.3		%	1.1		%		Total	20.6		%	22.8		%	(2.2)		%		18.6		%	19.4		%	(0.8)		%

_____________________

N/M = not meaningful

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

(2)Cost of ~~revenue is~~revenues are 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.

(3)Calculated as a percentage of individual segment direct revenue.

(4)Calculated as a percentage of total Company revenue.

Table of Contents

Direct Revenues

There are many factors which have impacted and continue to impact our revenues including, but not limited to: overall levels of industrial activity and economic growth in North America, existence or non-existence of large scale environmental waste and remediation projects, competitive industry pricing, overall market incineration capacity including captive incinerator closures, miles driven and related lubricant demand, impacts of acquisitions and divestitures, the level of emergency response services, government infrastructure investment, weather related events, the number of parts washers placed at customer sites, base and blended oil pricing, market supply for base oil products, market changes relative to the collection of used oil, our ability to manage the spread between oil product prices and prices for the collection of used oil ~~the number of parts washers placed at customer sites~~ and foreign currency translation. In addition, customer efforts to minimize hazardous waste and changes in regulation can ~~also~~ impact our revenues.

Environmental Services


		For the Three Months Ended								For the Six Months Ended									For the Three Months Ended								For the Six Months Ended
		June 30,				2022 over 2021				June 30,				2022 over 2021					June 30,				2023 over 2022				June 30,				2023 over 2022
(in thousands, except percentages)	(in thousands, except percentages)	2022		2021		Change		% Change		2022		2021		Change		% Change		(in thousands, except percentages)	2023		2022		Change		% Change		2023		2022		Change		% Change

Direct revenues	Direct revenues	$	1,090,743	$	724,097	$	366,646	50.6	%	$	2,038,188	$	1,378,699	$	659,489	47.8	%	Direct revenues	$	1,172,036	$	1,090,743	$	81,293	7.5	%	$	2,242,777	$	2,038,188	$	204,589	10.0	%

Environmental Services direct revenues for the three months ended June 30, ~~2022~~2023 increased ~~$366.6~~$81.3 million from the comparable period in ~~2021 driven~~2022 primarily ~~by the incremental business from the HydroChemPSC operations within industrial service and field and emergency response service revenues coupled with organic~~due to growth ~~across our other waste disposal service offerings. Direct revenues of~~in our industrial service offerings ~~increased $203.8~~and Safety-Kleen core service offerings. The $38.7 million of which approximately $173.7 million was generated by HydroChemPSC, while the remainder was primarily due to increased demand and pricing for our core industrial services. Technical services revenues increased $91.6 million largely due to higher throughput at our facilities and higher value waste streams coupled with pricing initiatives across the business. Higher volumes at our incinerators drove an increase in utilization from 87% in the second quarter of 2021 to 90% in the second quarter of 2022. We also saw an increase in landfill volumes in the second quarter of 2022 as compared to the second quarter of 2021. Field and emergency response services revenues increased approximately $40.1 million despite a $6.3 million decrease in COVID-19 decontaminationour industrial service ~~revenues. This overall increase~~offerings revenue was ~~both related to~~driven by contributions from the ~~HydroChemPSC business~~acquisition of ~~$34.2 million~~Thompson Industrial on March 31, 2023, as well as ~~organic~~ growth ~~from~~in the legacy ~~field services~~industrial operations. Direct revenues for the Safety-Kleen core service offerings increased ~~$31.1~~$25.9 million from the comparable period in ~~2021~~2022 due to improved pricing and greater demand for our containerized waste, parts washer and vacuum services. Field and emergency response service revenues increased $9.5 million. Within our technical services operations, utilization at our incinerators for the three months ended June 30, 2023 was 84% as compared to 90% in the prior year due to outages for required maintenance early in the second quarter of 2023. The Canadian operations of the Environmental Services segment were negatively impacted by ~~$5.8~~$7.0 million due to foreign currency translation.

Environmental Services direct revenues for the six months ended June 30, ~~2022~~2023 increased ~~$659.5~~$204.6 million from the comparable period in ~~2021. Consistent with the discussion above, a significant portion of this increase is~~2022 due to ~~the incremental business from the HydroChemPSC operations within industrial service and field and emergency response service revenues and organic~~ growth across our service offerings. ~~Direct revenues of~~Revenue from our industrial ~~service offerings increased $388.2~~services operations grew $66.2 million ~~of which approximately $329.8 million was generated by HydroChemPSC while the remainder was primarily~~ due to ~~increased demand and pricing for our~~organic growth as well as contributions from the acquisition of Thompson Industrial. Safety-Kleen core ~~industrial services. Technical~~ services ~~revenues increased $155.4~~offerings contributed $60.0 million ~~largely due~~ to ~~higher throughput at our facilities and higher value waste streams coupled with pricing initiatives. Utilization at our incinerators increased to 88%~~the overall growth of the Environmental Services segment in the first six months of 2022 largely driven by increased volume and fewer down days as compared to utilization of 83% in the six months ended June 30, 2021 which was impacted by significant weather events in the first quarter of 2021. We also saw an increase in landfill volumes in the six months of 20222023 as compared to the first six months of ~~2021.~~2022. This increase was generally due to greater demand and improved pricing for our containerized waste, parts washer and vacuum services. Technical services revenue increased $45.7 million with contributions across our portfolio of waste disposal facilities more than offsetting slightly lower revenues at our incinerators. Utilization at our incinerators for the six months ended June 30, 2023 was 82% as compared to 88% in the prior year due to unplanned outages for required maintenance and significant weather events early in the year. Pricing at the incinerators for the six months ended June 30, 2023 improved when compared to 2022 partially offsetting this lower utilization. Field and emergency response ~~services~~service revenues increased approximately $67.4 million despite a $25.8 million decrease in COVID-19 decontamination service revenues. This overall increase was both related to contributions from the HydroChemPSC business of $62.2 million as well as organic growth from increased demand in the legacy field services operations. Direct revenues for the Safety-Kleen core service offerings increased $48.0$25.2 million from the comparable period in ~~2021 due to improved pricing and greater demand for our containerized waste and vacuum services.~~2022. The Canadian operations of the Environmental Services segment were negatively impacted by ~~$5.8~~$14.7 million due to foreign currency translation.

~~Table of Contents~~

Safety-Kleen Sustainability Solutions


		For the Three Months Ended								For the Six Months Ended									For the Three Months Ended								For the Six Months Ended
		June 30,				2022 over 2021				June 30,				2022 over 2021					June 30,				2023 over 2022				June 30,				2023 over 2022
(in thousands, except percentages)	(in thousands, except percentages)	2022		2021		Change		% Change		2022		2021		Change		% Change		(in thousands, except percentages)	2023		2022		Change		% Change		2023		2022		Change		% Change

Direct revenues	Direct revenues	$	265,490	$	202,282	$	63,208	31.2	%	$	487,082	$	355,749	$	131,333	36.9	%	Direct revenues	$	225,748	$	265,490	$	(39,742)	(15.0)	%	$	462,287	$	487,082	$	(24,795)	(5.1)	%

Safety-Kleen Sustainability Solutions direct revenues for the three and six months ended June 30, 2022 increased $63.2 million and $131.3 million respectively from the comparable periods in 2021 predominately due to higher pricing of our base and blended oil products. ForIn the three months ended June 30, ~~2022, base oil sales revenues increased $47.8 million and blended oil sales revenues increased $6.7~~2023, Safety-Kleen Sustainability Solutions direct revenue decreased $39.7 million from the comparable period in ~~2021 both due to pricing increases which more than offset lower volumes sold. Pricing increases also drove increases~~2022. This decrease was driven by a $42.8 million decrease in base oil sales ~~revenues~~due to lower pricing despite increased volumes sold. Revenues from the collection of ~~$98.2 million~~used oil and blended oil sales ~~revenue~~partially offset this decrease by $4.1 million and $2.3 million respectively. The increase in revenues from the collection of ~~$17.7 million~~used oil was driven by higher collection volumes and pricing increases for these services, while the ~~six months ended June 30, 2022 when compared with the six months ended June 30, 2021.~~increase in blended oil sales was driven by higher volume which offset a lower price for these products. The Canadian operations of the Safety-Kleen Sustainability Solutions segment were negatively impacted by $1.5 million in ~~both~~ the three ~~and~~months ended June 30, 2023 due to foreign currency translation.

Table of Contents

In the six months ended June 30, 2023, Safety-Kleen Sustainability Solutions direct revenues decreased $24.8 million from the comparable period in 2022 largely due to a $31.7 million reduction in revenues from base oil sales due to lower pricing despite increased volumes sold. Revenues from contract packaging and blending decreased $7.6 million and blended oil revenues decreased $3.1 million. Partially offsetting these decreases were incremental revenues of $12.4 million from our recycled fuel oil and refinery byproducts driven by operations acquired in mid-2022 and an increase of $2.7 million in revenues from the collection of used oil due to higher collection volumes and pricing increases for these services. The Canadian operations of the Safety-Kleen Sustainability Solutions segment were negatively impacted by $3.9 million in the six months ended June 30, 2023 due to foreign currency translation.

Cost of Revenues

We believe that ~~our ability to manage~~ operating ~~costs~~cost management is ~~important~~vital to our ability to remain price competitive. ~~We continue to~~As we experience ~~the current~~cost increases, including those driven by macroeconomic inflationary pressures ~~across several cost categories, but most notably related to~~such as internal and external labor, transportation, general supplies and energy related ~~costs. We continue to~~costs, we manage these ~~increases~~costs through ~~constant~~diligent cost monitoring ~~as well as our~~and overall customer pricing strategies designed to offset the negative inflationary impacts on our margins.

We ~~also~~ continue to upgrade the quality and efficiency of our services through the development of new technology and continued modifications and expansion at our facilities, invest in new business opportunities and aggressively implement strategic sourcing and logistics solutions in the face of these inflationary pressures, while also continuing to optimize our management and operating structure in an effort to manage our operating margins.

Environmental Services

For the Three Months Ended For the Six Months Ended
June 30, 2022 over 2021 June 30, 2022 over 2021
(in thousands, except percentages) 2022 2021
Change %
Change 2022 2021 Change % Change
Cost of revenues $ 743,659 $ 487,257 $ 256,402 52.6 % $ 1,428,995 $ 938,512 $ 490,483 52.3 %
As a % of Direct revenues 68.2 % 67.3 % 0.9 % 70.1 % 68.1 % 2.0 %


	For the Three Months Ended											For the Six Months Ended
	June 30,						2023 over 2022					June 30,						2023 over 2022
(in thousands, except percentages)	2023			2022			Change			% Change		2023			2022			Change			% Change
Cost of revenues	$	781,251		$	743,659		$	37,592		5.1	%	$	1,534,611		$	1,428,995		$	105,616		7.4	%
As a % of Direct revenues	66.7		%	68.2		%	(1.5)		%			68.4		%	70.1		%	(1.7)		%

Environmental Services cost of revenues for the three months ended June 30, ~~2022~~2023 increased ~~$256.4~~$37.6 million from the comparable period in ~~2021, primarily due to the increase in direct revenues noted above, including additional costs from the HydroChemPSC operations. Cost of revenues~~2022, however as a percentage of direct revenues for the three months ended June 30, 2022 remained relatively consistent with the three months ended June 30, 2021 despite lower COVID-19 decontamination services and higher industrial services which typically operate at a lower margin than our waste disposal focused offerings.revenue these costs decreased 1.5%. Overall, labor and benefit related costs increased ~~$124.8~~$32.4 million and equipment and supply costs increased ~~$61.2~~$7.1 million, ~~and external~~commensurate with the revenue growth in the business. External transportation, vehicle and fuel related costs ~~increased $51.1 million.~~decreased $4.4 million which, along with the pricing increases noted above, drove the improvement in these total costs as a percentage of revenues.

Environmental Services cost of revenues for the six months ended June 30, ~~2022~~2023 increased ~~$490.5~~$105.6 million from the comparable period in ~~2021, primarily due to the increase in direct revenues noted above, including additional costs from the HydroChemPSC operations. Cost of revenues~~2022, however as a percentage of ~~direct revenues increased 2.0% from~~revenue these costs decreased 1.7%. Overall, commensurate with the ~~comparable period~~revenue growth in the prior year mainly due to the mix of services, including lower COVID-19 decontamination services and the growth of our industrial services offerings which typically operate at margins lower than our waste disposal focused offerings. Inflationary pressures across several cost categories including labor, transportation, equipment and supply costs have also contributed to the increase of these costs as a percentage of revenues. Overall,business, labor and benefit related costs increased ~~$234.9~~$74.0 million and equipment and supply costs increased ~~$128.5 million and external~~$27.3 million. External transportation, vehicle and fuel related costs also increased ~~$91.5 million.~~

~~Table~~$2.1 million, however these costs improved as a percentage of ~~Contents~~

revenue driving overall improvement in the segment's costs as a percentage of revenue.

Safety-Kleen Sustainability Solutions


		For the Three Months Ended											For the Six Months Ended												For the Three Months Ended											For the Six Months Ended
		June 30,						2022 over 2021					June 30,						2022 over 2021						June 30,						2023 over 2022					June 30,						2023 over 2022
(in thousands, except percentages)	(in thousands, except percentages)	2022			2021			Change			% Change		2022			2021			Change			% Change		(in thousands, except percentages)	2023			2022			Change			% Change		2023			2022			Change			% Change
Cost of revenues	Cost of revenues	$	151,020		$	123,025		$	27,995		22.8	%	$	303,037		$	231,401		$	71,636		31.0	%	Cost of revenues	$	153,901		$	151,020		$	2,881		1.9	%	$	329,758		$	303,037		$	26,721		8.8	%
As a % of Direct revenues	As a % of Direct revenues	56.9		%	60.8		%	(3.9)		%			62.2		%	65.0		%	(2.8)		%			As a % of Direct revenues	68.2		%	56.9		%	11.3		%			71.3		%	62.2		%	9.1		%

Safety-Kleen Sustainability Solutions cost of revenues for the three months ended June 30, ~~2022~~2023 increased ~~$28.0~~$2.9 million from the comparable period in ~~2021.~~2022. As a percentage of revenues, these costs increased by 11.3% predominately due to the market related pricing decreases discussed in the revenue section above. Overall, labor and benefit related expense increased $5.2 million, transportation, vehicle and fuel costs increased $4.8 million and equipment and supply costs increased $2.0 million. These cost increases were driven by the increased collection and production volumes and the additional costs from businesses acquired in mid-2022. The cost of used oil as the primary raw ~~materials used~~material in ~~production of~~ our recycled base and blended oil products ~~increased $17.8~~decreased by $9.7 million driven ~~mainly~~ by ~~increased costs~~our efforts to ~~obtain used~~manage the spread between the pricing of base oil ~~through~~products and our used oil collection services. ~~The increase in base oil pricing~~We expect these raw material costs to continue to decrease in the ~~second~~third quarter of ~~2022 as compared to the same period in 2021 has resulted in a correlating increase in the cost we now pay for used oil feedstock. Increased external transportation, vehicle and fuel costs~~2023.

Table of ~~$5.1 million also contributed to the overall increase in cost of revenues, with fuel being the largest component of this increase.~~Contents

Safety-Kleen Sustainability Solutions cost of revenues for the six months ended June 30, ~~2022~~2023 increased ~~$71.6~~$26.7 million from the comparable period in ~~2021. The cost~~2022 and as a percentage of ~~raw materials used in production of our oil products~~revenues, these costs increased ~~$49.5 million, more than half of which was~~by 9.1% mainly due to ~~increased costs to obtain used oil through our used oil collection services. As noted above,~~ the ~~increase in base oil~~market related pricing ~~has resulted in a correlating increase~~decreases discussed in the ~~cost we now pay for used oil feedstock. Other costs that contributed to the overall increase include the cost of~~revenue section above. Overall, external transportation, vehicle and fuel costs ~~which~~ increased ~~$9.6~~$13.6 million, ~~and~~ labor and benefit related expense increased $10.9 million and equipment and supply costs ~~which~~ increased ~~$2.8 million.~~

~~As a percentage of revenues, Safety-Kleen Sustainability Solutions~~$3.3 million also driven by increased collection and production volumes and the incremental costs from businesses acquired mid-2022. Similar to the discussion in the preceding paragraph, costs of ~~revenues~~oil additives and other raw materials decreased by 3.9% and 2.8% in the three and six months ended June 30, 2022 as compared to the comparable periods in 2021. This margin improvement was largely driven by the increased pricing of our products which outpaced the increase in cost of revenues as the business continued to capitalize on the favorable market conditions and efficient management of the spread between the pricing of products and the rising costs to obtain oil feedstock, including labor and fuel costs, in this inflationary environment.$2.6 million.

Selling, General and Administrative Expenses

We strive to manage our selling, general and administrative ("SG&A") expenses commensurate with the overall performance of our segments and corresponding revenue levels. We believe our ability to properly align these costs with business performance is reflective of our strong management of the businesses and further promotes our ability to remain competitive in the marketplace.

Environmental Services


		For the Three Months Ended											For the Six Months Ended												For the Three Months Ended											For the Six Months Ended
		June 30,						2022 over 2021					June 30,						2022 over 2021						June 30,						2023 over 2022					June 30,						2023 over 2022
(in thousands, except percentages)	(in thousands, except percentages)	2022			2021			Change			% Change		2022			2021			Change			% Change		(in thousands, except percentages)	2023			2022			Change			% Change		2023			2022			Change			% Change
SG&A expenses	SG&A expenses	$	77,743		$	60,799		$	16,944		27.9	%	$	156,250		$	123,892		$	32,358		26.1	%	SG&A expenses	$	85,163		$	77,743		$	7,420		9.5	%	$	174,199		$	156,250		$	17,949		11.5	%
As a % of Direct revenues	As a % of Direct revenues	7.1		%	8.4		%	(1.3)		%			7.7		%	9.0		%	(1.3)		%			As a % of Direct revenues	7.3		%	7.1		%	0.2		%			7.8		%	7.7		%	0.1		%

Environmental Services SG&A expenses for the three and six months ended June 30, ~~2022~~2023 increased ~~$16.9~~$7.4 million and $17.9 million, respectively, from the comparable ~~period~~periods in ~~2021, most predominately~~2022 however, as a percentage of revenues, these costs remained relatively consistent as a result of cost control initiatives. The overall cost increases were due to ~~a $12.9 million increase in~~higher labor and ~~benefit~~benefits related ~~costs. Environmental Services SG&A expenses for~~costs of $6.9 million in the three months ended June 30, 2023 and $18.2 million in the six months ended June 30, ~~2022 increased $32.4 million from the comparable period in 2021, also~~2023 predominately due to ~~increased labor~~investments in our employees and ~~benefit related costs of $23.9 million. Increased costs~~higher incentive compensation resulting from ~~the HydroChemPSC business operations drove approximately $12.0 million~~revenue growth and $24.2 million of the labor and benefit cost increases, respectively. As a percentage of revenue, the Environmental Services SG&A improved by 1.3% in both the three and six months ended June 30, 2022, driven both by the HydroChemPSC business operations which have lower SG&A expenses when compared to the business's related revenues and overall improved leverage of SG&A in the legacy Environmental Services business. The improved leverage of our SG&A spending significantly contributed to the overall increase in profitability of the segment.

~~Table of Contents~~

profitability.

Safety-Kleen Sustainability Solutions


		For the Three Months Ended											For the Six Months Ended												For the Three Months Ended											For the Six Months Ended
		June 30,						2022 over 2021					June 30,						2022 over 2021						June 30,						2023 over 2022					June 30,						2023 over 2022
(in thousands, except percentages)	(in thousands, except percentages)	2022			2021			Change			% Change		2022			2021			Change			% Change		(in thousands, except percentages)	2023			2022			Change			% Change		2023			2022			Change			% Change
SG&A expenses	SG&A expenses	$	17,460		$	15,943		$	1,517		9.5	%	$	35,158		$	29,402		$	5,756		19.6	%	SG&A expenses	$	18,432		$	17,460		$	972		5.6	%	$	37,651		$	35,158		$	2,493		7.1	%
As a % of Direct revenues	As a % of Direct revenues	6.6		%	7.9		%	(1.3)		%			7.2		%	8.3		%	(1.1)		%			As a % of Direct revenues	8.2		%	6.6		%	1.6		%			8.1		%	7.2		%	0.9		%

Safety-Kleen Sustainability Solutions SG&A expenses for the three and six months ended June 30, ~~2022~~2023 increased ~~$1.5~~$1.0 million and ~~$5.8~~$2.5 million from the comparable periods in ~~2021~~2022 and as a percentage of revenues, these costs increased from the prior period, mainly due to the revenue reductions discussed above. The overall cost increases were primarily ~~attributable~~due to higher labor and benefit ~~cost increases of $1.2 million and $4.6 million, respectively. As a percentage of revenue, these~~ costs ~~improved~~ in ~~both~~ the three and six months ended June 30, ~~2022 when compared to~~2023, as we expanded our sales team for the ~~same periods~~segment in ~~the prior year.~~mid-2022.

Corporate Items


		For the Three Months Ended											For the Six Months Ended												For the Three Months Ended											For the Six Months Ended
		June 30,						2022 over 2021					June 30,						2022 over 2021						June 30,						2023 over 2022					June 30,						2023 over 2022
(in thousands, except percentages)	(in thousands, except percentages)	2022			2021			Change			% Change		2022			2021			Change			% Change		(in thousands, except percentages)	2023			2022			Change			% Change		2023			2022			Change			% Change
SG&A expenses	SG&A expenses	$	60,405		$	47,364		$	13,041		27.5	%	$	115,373		$	92,453		$	22,920		24.8	%	SG&A expenses	$	63,787		$	60,405		$	3,382		5.6	%	$	122,285		$	115,373		$	6,912		6.0	%
As a % of Total Clean Harbors' Direct revenues		4.5		%	5.1		%	(0.6)		%			4.6		%	5.3		%	(0.7)		%
As a % of Total Company Direct revenues																								As a % of Total Company Direct revenues	4.6		%	4.5		%	0.1		%			4.5		%	4.6		%	(0.1)		%

We manage our Corporate ~~Items~~ SG&A expenses commensurate with the overall total Company performance and direct revenue levels. Generally, as revenues increase, we would expect some increase in these costs. Corporate ~~Items~~ SG&A expenses for the three and six months ended June 30, ~~2022 increased from the comparable periods in 2021, but decreased in both periods~~2023 remained consistent as a percentage of total Clean Harbors' direct revenues ~~which has also contributed~~when compared to ~~Clean Harbors' overall profitability.~~the

~~For the three months ended June 30, 2022, the overall cost increase~~

Table of ~~$13.0 million included a $6.8 million increase~~Contents

same periods in labor and benefits related costs, including higher stock-based compensation costs and human resource related costs. The higher stock-based compensation costs are primarily driven by the timing of grants in 2022. Overall we expect the stock-based grants in the current year to remain relatively consistent with the prior year. The ~~remaining net increase is spread across various cost categories.~~

~~For~~SG&A expenses for the six months ended June 30, 2022 ~~the overall increase~~includes a benefit of ~~$22.9~~$3.0 million ~~included a $13.3 million increase in labor and benefits~~ related ~~costs, including higher stock-based compensation costs, incentive costs and human resource related costs. Similar~~ to the discussion above, the increase in stock-based compensation is mainly due to the timing of grants in 2022, though we expect the overall grants for 2022 to be relatively consistent with 2021. Both bad debt expense and information technology/cyber-security related technology costs increased $4.0 million, respectively. These increases were partially offset by the $3.0 million breakup fee received ~~related to~~from Vertex Energy, Inc. for the termination of the proposed asset ~~acquisition from Vertex Energy, Inc. The remaining net increase is spread across various cost categories.~~acquisition.

Adjusted EBITDA

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 ~~GAAP.~~generally accepted accounting principles ("GAAP"). Adjusted EBITDA is not calculated identically by all companies and therefore our measurements of Adjusted EBITDA, while defined consistently and in accordance with our existing credit agreement, may not be comparable to similarly titled measures reported by other companies.


	For the Three Months Ended											For the Six Months Ended
	June 30,						2023 over 2022					June 30,						2023 over 2022
(in thousands, except percentages)	2023			2022			Change			% Change		2023			2022			Change			% Change
Adjusted EBITDA:
Environmental Services	$	305,622		$	269,341		$	36,281		13.5	%	$	533,967		$	452,943		$	81,024		17.9	%
Safety-Kleen Sustainability Solutions	53,415			97,010			(43,595)			(44.9)		94,878			148,887			(54,009)			(36.3)
Corporate Items	(71,531)			(57,281)			(14,250)			(24.9)		(126,201)			(112,501)			(13,700)			(12.2)
Total	$	287,506		$	309,070		$	(21,564)		(7.0)	%	$	502,644		$	489,329		$	13,315		2.7	%
Adjusted EBITDA as a % of Direct Revenues (1):
Environmental Services	26.1		%	24.7		%	1.4		%			23.8		%	22.2		%	1.6		%
Safety-Kleen Sustainability Solutions	23.7		%	36.5		%	(12.8)		%			20.5		%	30.6		%	(10.1)		%
Corporate Items	(5.1)		%	(4.2)		%	(0.9)		%			(4.7)		%	(4.5)		%	(0.2)		%
Total	20.6		%	22.8		%	(2.2)		%			18.6		%	19.4		%	(0.8)		%

______________

~~Table~~(1) Environmental Services and Safety-Kleen Sustainability Solutions calculated as a percentage of ~~Contents~~

For the Three Months Ended For the Six Months Ended
June 30, 2022 over 2021 June 30, 2022 over 2021
(in thousands, except percentages) 2022 2021 Change %
Change 2022 2021 Change % Change
Adjusted EBITDA:
Environmental Services $ 269,341 $ 176,041 $ 93,300 53.0 % $ 452,943 $ 316,295 $ 136,648 43.2 %
Safety-Kleen Sustainability Solutions 97,010 63,314 33,696 53.2 148,887 94,946 53,941 56.8
Corporate Items (57,281) (51,584) (5,697) (11.0) (112,501) (94,019) (18,482) (19.7)
Total $ 309,070 $ 187,771 $ 121,299 64.6 % $ 489,329 $ 317,222 $ 172,107 54.3 %
individual segment revenues. Corporate Items calculated as a percentage of total Company revenues.

We use Adjusted EBITDA to enhance our understanding of our 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 certain expenses relating to transactions not reflective of our core operations. Adjusted EBITDA margin for the Environmental Services segment improved due to the revenue pricing increases and cost management in both cost of revenues and SG&A expenses. Adjusted EBITDA margin in Safety-Kleen Sustainability Solutions segment decreased mainly due to the reduced revenue amounts. Corporate Items Adjusted EBITDA margin remained relatively consistent as a percentage of total Company revenues with the slight increase due to insurance related charges in cost of revenues.

The information about our operating performance provided by ~~this financial measure~~Adjusted EBITDA is used by our management for a variety of purposes. We regularly communicate Adjusted EBITDA results to our lenders since our loan covenants are based upon levels of Adjusted EBITDA achieved and to our board of directors, and we discuss with the board our interpretation of such ~~results with the board.~~results. We also compare our Adjusted EBITDA performance against internal targets as a key factor in determining cash and ~~stock~~equity 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.

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 users of our financial statements to obtain~~provides a better understanding of our core operating performance and ~~to evaluate the efficacy~~how management evaluates and measures our performance.

Table of ~~the methodology and information used by management to evaluate and measure such performance on a standalone and a comparative basis.~~Contents

The following is a reconciliation of net income to Adjusted EBITDA for the following periods (in thousands, except percentages):

For the Three Months Ended For the Six Months Ended
June 30, June 30,
2022 2021 2022 2021
Net income $ 148,157 $ 67,075 $ 193,471 $ 88,811
Accretion of environmental liabilities 3,197 2,873 6,353 5,826
Stock-based compensation 6,835 3,305 12,547 6,785
Depreciation and amortization 87,868 71,592 172,166 143,755
Other (income) expense, net (1,265) 1,480 (1,969) 2,708
Gain on sale of business (8,864) — (8,864) —
Interest expense, net of interest income 26,256 18,051 51,273 35,969
Provision for income taxes 46,886 23,395 64,352 33,368
Adjusted EBITDA $ 309,070 $ 187,771 $ 489,329 $ 317,222
As a % of Direct revenues 22.8 % 20.3 % 19.4 % 18.3 %

~~Table of Contents~~


	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2023			2022			2023			2022
Net income	$	115,766		$	148,157		$	188,167		$	193,471
Accretion of environmental liabilities	3,486			3,197			6,893			6,353
Stock-based compensation	4,500			6,835			10,518			12,547
Depreciation and amortization	89,697			87,868			174,455			172,166
Other expense (income), net	1,283			(1,265)			1,167			(1,969)
Loss on early extinguishment of debt	—			—			2,362			—
Gain on sale of business	—			(8,864)			—			(8,864)
Interest expense, net of interest income	30,072			26,256			50,704			51,273
Provision for income taxes	42,702			46,886			68,378			64,352
Adjusted EBITDA	$	287,506		$	309,070		$	502,644		$	489,329
As a % of Direct revenues	20.6		%	22.8		%	18.6		%	19.4		%

Depreciation and Amortization


		For the Three Months Ended								For the Six Months Ended									For the Three Months Ended								For the Six Months Ended
		June 30,				2022 over 2021				June 30,				2022 over 2021					June 30,				2023 over 2022				June 30,				2023 over 2022
(in thousands, except percentages)	(in thousands, except percentages)	2022		2021		Change		% Change		2022		2021		Change		% Change		(in thousands, except percentages)	2023		2022		Change		% Change		2023		2022		Change		% Change
Depreciation of fixed assets and amortization of landfills and finance leases	Depreciation of fixed assets and amortization of landfills and finance leases	$	75,616	$	63,828	$	11,788	18.5	%	$	147,674	$	128,402	$	19,272	15.0	%	Depreciation of fixed assets and amortization of landfills and finance leases	$	77,194	$	75,616	$	1,578	2.1	%	$	149,226	$	147,674	$	1,552	1.1	%
Permits and other intangibles amortization	Permits and other intangibles amortization	12,252		7,764		4,488		57.8		24,492		15,353		9,139		59.5		Permits and other intangibles amortization	12,503		12,252		251		2.0		25,229		24,492		737		3.0
Total depreciation and amortization	Total depreciation and amortization	$	87,868	$	71,592	$	16,276	22.7	%	$	172,166	$	143,755	$	28,411	19.8	%	Total depreciation and amortization	$	89,697	$	87,868	$	1,829	2.1	%	$	174,455	$	172,166	$	2,289	1.3	%

Depreciation and amortization for the three and six months ended June 30, ~~2022~~2023 increased by ~~$16.3~~$1.8 million and ~~$28.4~~$2.3 million from the comparable periods in ~~2021~~2022 due to ~~the~~increased depreciation and amortization offrom new finance leases in the ~~HydroChemPSC~~period and the Thompson Industrial tangible and intangible assets ~~which were~~ acquired on March 31, 2023.

Loss on Early Extinguishment of Debt


	For the Three Months Ended								For the Six Months Ended
	June 30,				2023 over 2022				June 30,				2023 over 2022
(in thousands, except percentages)	2023		2022		Change		% Change		2023		2022		Change		% Change
Loss on early extinguishment of debt	$	—	$	—	$	—	—	%	$	(2,362)	$	—	$	(2,362)	100.0	%

During the six months ended June 30, 2023, we recorded a $2.4 million loss on early extinguishment of debt in inconnection with the ~~fourth quarter~~repayment of ~~2021.~~the remaining $614.0 million principal amount of the 2024 Term Loans. For additional information regarding this repayment, see Note 12, "Financing Arrangements," to the accompanying financial statements.

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Gain on Sale of Business

For the Three Months Ended For the Six Months Ended
June 30, 2022 over 2021 June 30, 2022 over 2021
2022 2021 Change %
Change 2022 2021 Change %
Change
Gain on sale of business $ 8,864 $ — $ 8,864 100.0 % $ 8,864 $ — $ 8,864 100.0 %


	For the Three Months Ended								For the Six Months Ended
	June 30,				2023 over 2022				June 30,				2023 over 2022
(in thousands, except percentages)	2023		2022		Change		% Change		2023		2022		Change		% Change
Gain on sale of business	$	—	$	8,864	$	(8,864)	100.0	%	$	—	$	8,864	$	(8,864)	(100.0)	%

During the three and six months ended June 30, 2022, we recorded aan $8.9 million gain on the sale of a non-core line of business within our Environmental Services segment. For additional information regarding this gain on sale of business, see Note 5, "Disposition of Business," to the accompanying financial statements.

~~Provision~~Interest Expense, Net of Interest Income


	For the Three Months Ended								For the Six Months Ended
	June 30,				2023 over 2022				June 30,				2023 over 2022
(in thousands, except percentages)	2023		2022		Change		% Change		2023		2022		Change		% Change
Interest expense, net of interest income	$	(30,072)	$	(26,256)	$	(3,816)	14.5	%	$	(50,704)	$	(51,273)	$	569	(1.1)	%

Interest expense, net of interest income for ~~Income Taxes~~

For the Three Months Ended For the Six Months Ended
June 30, 2022 over 2021 June 30, 2022 over 2021
(in thousands, except percentages) 2022 2021 Change %
Change 2022 2021 Change %
Change
Provision for income taxes $ 46,886 $ 23,395 $ 23,491 100.4 % $ 64,352 $ 33,368 $ 30,984 92.9 %
Effective tax rate 24.0 % 25.9 % (1.9) % 25.0 % 27.3 % (2.3) %

the three months ended June 30, 2023 increased $3.8 million from the comparable period in 2022 due to higher interest rates on our portfolio of debt obligations. Interest expense, net of interest income for the six months ended June 30, 2023 decreased $0.6 million from the comparable period in 2022 due to the $8.3 million benefit recognized from settling interest rate swaps in connection with repaying certain of our variable rate debt in January 2023. Absent this benefit, interest expense, net of interest income, increased $7.7 million due to higher interest rates on our portfolio of debt obligations. The ~~provision for income taxes~~effective interest rates on our long-term debt for the three and six months ended June 30, ~~2022 increased $23.5 million~~2023 were 5.52% and ~~$31.0 million from the~~5.30%, respectively. The comparable ~~periods in 2021, due to an increase in income before provision for income taxes. Our effective tax~~ rates for the three and six months ended June 30, 2022 were 4.24% and 3.90% respectively.

For the remainder of 2023, we anticipate the effective rate will be approximately 5.96% given the current interest rate environment and our portfolio of long-term debt. For additional information regarding the financing events during 2023 and our current portfolio of long-term debt, see Note 12, "Financing Arrangements," to the accompanying financial statements.

Provision for Income Taxes


	For the Three Months Ended											For the Six Months Ended
	June 30,						2023 over 2022					June 30,						2023 over 2022
(in thousands, except percentages)	2023			2022			Change			% Change		2023			2022			Change			% Change
Provision for income taxes	$	42,702		$	46,886		$	(4,184)		(8.9)	%	$	68,378		$	64,352		$	4,026		6.3	%
Effective tax rate	26.9		%	24.0		%	2.9		%			26.7		%	25.0		%	1.7		%

For the three months ended June 30, 2023, the provision for income taxes decreased ~~1.9%~~$4.2 million from the comparable period in 2022 due to a decrease in income before provision for income taxes. For the six months ended June 30, 2023, the provision for income taxes increased $4.0 million from the comparable period in 2022 due to the utilization of unbenefited losses in certain of our Canadian entities which benefitted the expense in 2022. Our effective tax rate for the three and ~~2.3%, respectively,~~six months ended June 30, 2023 increased 2.9% and 1.7% when compared to the three and six months ended June 30, ~~2021. The decrease in our effective tax rate is largely~~2022 also due to the utilization of ~~previous~~ unbenefited losses in ~~certain of our Canadian entities.~~2022.

In recent periods, certain Canadian entities which have historically generated net operating losses and for which we have recognized valuation allowances, have been operating at a profit. This recent profitability and associated utilization of previous unbenefited losses is due to operational improvements and tax strategies as well as government subsidies and the gain on sale of a line of business. As of June 30, 2022, we do not yet believe that sufficient positive evidence exists to support that this return to profitability will continue for a sustained period. We will continue to evaluate this on an ongoing basis to determine when, if at all, to release some or all of the associated remaining valuation allowances.

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Liquidity and Capital Resources

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 internal investing cash needs. We monitor our actual needs and forecasted cash flows, our liquidity and our capital resources, enabling us to plan our present needs and fund items that may arise during the year as a result of changing business conditions or opportunities. Furthermore, our existing cash balance and the availability of additional borrowings under our revolving credit facility provide additional potential sources of liquidity should they be required.

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Summary of Cash Flow Activity


		Six Months Ended					Six Months Ended
		June 30,					June 30,
(in thousands)	(in thousands)	2022		2021		(in thousands)	2023		2022
Net cash from operating activities	Net cash from operating activities	$	131,970	$	265,432	Net cash from operating activities	$	235,573	$	131,970
Net cash used in investing activities	Net cash used in investing activities	(187,482)		(132,340)		Net cash used in investing activities	(347,265)		(187,482)
Net cash used in financing activities	Net cash used in financing activities	(51,431)		(60,534)		Net cash used in financing activities	(142,853)		(51,431)

Net cash from operating activities

Net cash from operating activities for the six months ended June 30, ~~2022~~2023 was ~~$132.0~~$235.6 million as compared to ~~$265.4~~$132.0 million in the comparable period of ~~2021. The decrease~~2022. This $103.6 million increase in operating cash flows ~~from the comparable period of 2021~~ was attributable to improved working capital balances and increased income from operations, partially offset by an increase in ~~working capital caused by the significant growth~~income taxes paid and an increase in ~~the business, and higher incentive compensation and interest payments in the first six months of 2022, partially offset by greater levels of operating income.~~environmental expenditures.

Net cash used in investing activities

Net cash used in investing activities for the six months ended June 30, ~~2022~~2023 was ~~$187.5~~$347.3 million, an increase of ~~$55.1~~$159.8 million from the comparable period in ~~2021. The increase in net cash used in investing activities as compared to the same prior year period was primarily due to a $56.1 million increase in additions~~2022. Additions to property, plant and equipment, ~~inclusive~~net of ~~$13.5~~proceeds from the sale and disposal of fixed assets increased $56.3 million, oflargely driven by incremental capital spending for our new incinerator construction in Kimball, ~~Nebraska and a $45.8~~Nebraska. Cash used for acquisitions increased $51.9 million, ~~increase in acquisitions, net of~~while cash ~~acquired. These increases were partially offset by a $28.8 million cash increase related~~paid relative to the timing of investment transactions within our wholly owned captive insurance company ~~and a~~increased $33.8 million. Additionally, during the six months ended June 30, 2022 we received $17.5 million ~~cash inflow~~in proceeds from the disposition of a line of business.

Net cash used in financing activities

Net cash used in financing activities for the six months ended June 30, ~~2022 was~~2023 increased $91.4 million from $51.4 million ~~as compared~~in 2022 to ~~$60.5~~$142.9 million in 2023. During the ~~comparable period~~six months ended June 30, 2023, the Company repaid $614.0 million of secured senior term loans with the proceeds from issuing $500.0 million of unsecured senior notes. Associated with this refinancing the Company also paid an additional $6.0 million of additional finance costs in ~~2021. This decrease of $9.1 million was primarily due to an $11.7 million decrease in repurchases of common stock during~~ the first six months of ~~2022 partially offset by a $5.0~~2023. Partially offsetting this the Company spent $25.7 million ~~increase in debt principal payments required by the new term loans executed in the fourth quarter~~less for repurchases of ~~2021.~~common stock.

Adjusted Free Cash Flow

Management considers adjusted free cash flow to be a measure of liquidity which provides useful information to ~~both~~ management, creditors and investors about our financial strength and ~~our~~ ability to generate cash. Additionally, adjusted free cash flow is a metric on which a portion of management incentive compensation is based. We define adjusted free cash flow as net cash from operating activities excluding cash impacts of items derived from non-operating activities, ~~such as taxes paid in connection with divestitures,~~ less additions to property, plant and equipment plus proceeds from sales or disposals of fixed assets. Adjusted free cash flow should not be considered an alternative to net cash from operating activities or other measurements under GAAP. Adjusted free cash flow is not calculated identically by all companies, and therefore our measurements of adjusted free cash flow may not be comparable to similarly titled measures reported by other companies.

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The following is a reconciliation from net cash from operating activities to adjusted free cash flow for the following periods (in thousands):


		Six Months Ended					Six Months Ended
		June 30,					June 30,
		2022		2021			2023		2022
Net cash from operating activities	Net cash from operating activities	$	131,970	$	265,432	Net cash from operating activities	$	235,573	$	131,970
Additions to property, plant and equipment	Additions to property, plant and equipment	(148,042)		(91,988)		Additions to property, plant and equipment	(204,298)		(148,042)

Proceeds from sale and disposal of fixed assets	Proceeds from sale and disposal of fixed assets	3,023		3,479		Proceeds from sale and disposal of fixed assets	2,944		3,023
Adjusted free cash flow	Adjusted free cash flow	$	(13,049)	$	176,923	Adjusted free cash flow	$	34,219	$	(13,049)

Summary of Capital Resources

At June 30, ~~2022,~~2023, cash and cash equivalents and marketable securities totaled ~~$415.4~~$326.1 million, compared to ~~$534.3~~$554.6 million at December 31, ~~2021.~~2022. This reduction was primarily attributable to the net reduction of $114.0 million in long-term debt obligations and the payment of $111.9 million for the acquisition of Thompson Industrial in 2023. At June 30, ~~2022,~~2023, cash and cash equivalents held by our ~~foreign~~Canadian subsidiaries totaled ~~$52.3~~$29.3 million. The cash and cash equivalents and marketable securities balance for our U.S. operations was ~~$363.1~~$296.9 million at June 30, ~~2022.~~2023. Our U.S. operations had net operating cash inflows of ~~$139.6~~$226.0 million for the six months ended June 30, ~~2022.~~2023.

We also maintain a $400.0 million revolving credit facility of which, as of June 30, ~~2022,~~2023, approximately ~~$290.6~~$274.8 million was available to borrow ~~and~~under the facility, with letters of credit ~~under the credit facility in the amount~~ of ~~$109.4~~$125.2 million ~~were~~ outstanding.

Material Capital Requirements

Capital Expenditures

Capital expenditures during the first six months of ~~2022~~2023 were ~~$148.0~~$204.3 million as compared to ~~$92.0~~$148.0 million during the first six months of ~~2021.~~2022. We anticipate that ~~2022~~2023 capital spending, net of disposals, will be in the range of ~~$320.0~~$400.0 million to ~~$340.0 million. This includes approximately $45.0~~$420.0 million, including $85.0 million to ~~$50.0~~$90.0 million of capital spending for our new incinerator construction in Kimball, ~~Nebraska, of which $13.5 million has been spent during~~Nebraska.

We anticipate that the ~~first six months of 2022.~~

~~As always, unanticipated~~capital spending will be funded by cash from our operations. Unanticipated changes in environmental regulations could require us to make significant capital expenditures for our facilities and ~~could~~ adversely affect our results of operations and cash flow.

During the first six months of 2023, capital spending on the construction of our new incinerator at our Kimball, Nebraska facility was approximately $35.4 million. The current capital expenditure estimate for this project is approximately $180.0 million and we anticipate the project to be complete in early 2025. As of June 30, 2023, a total of $87.5 million has been spent on the project.

Financing Arrangements

In January 2023, we issued $500.0 million principal amount of 6.375% unsecured senior notes due 2031. The net proceeds of the issuance, along with a $114.0 million borrowing under our existing revolving credit facility and cash on hand, were used to repay the aggregate principal balance of our 2024 Term Loans. In the three months ended June 30, 2023, we repaid the $114.0 million borrowing on the revolving credit facility.

As of June 30, ~~2022,~~2023, our financing arrangements include (i) ~~$715.9 million of senior secured term loans due 2024, (ii)~~ $545.0 million of 4.875% senior unsecured notes due 2027, ~~(iii) $995.0~~(ii) $985.0 million of senior secured term loans due 2028, ~~and (iv)~~(iii) $300.0 million of 5.125% senior unsecured notes due ~~2029. We~~2029 and (iv) $500.0 million of 6.375% senior unsecured notes due 2031. As noted above, we also maintain our $400.0 million revolving credit ~~facility. As~~facility with no amounts owed as of June 30, 2022, under the revolving credit facility, we had no outstanding loan balance, $290.6 million available to borrow and outstanding letters of credit of $109.4 million. We obtain standby letters of credit as security for financial assurances we have been required to provide to regulatory bodies for our hazardous waste facilities and which would be called only in the event that we fail to satisfy closure, post-closure and other obligations under the permits issued by those regulatory bodies for such licensed facilities.2023.

The material terms of these arrangements are discussed further in Note 12, “Financing Arrangements,” to ~~our consolidated~~the accompanying financial ~~statements included in Item 8 of this report.~~statements.

As of ~~December 31, 2021,~~June 30, 2023, we were in compliance with the covenants of all of our debt agreements, and we believe we will continue to meet such covenants.

Common Stock Repurchases Pursuant to Publicly Announced Plan

The Company's common stock repurchases are made pursuant to the previously authorized board approved plan to repurchase up to $600.0 million of the Company's common stock. During the three and six months ended June 30, 2023, the Company repurchased and retired a total of approximately 36.5 thousand and 58.7 thousand shares of the Company's common stock, respectively, for total expenditures of approximately $5.0 million and $8.0 million, respectively. During the three and six months

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ended June 30, 2022, the Company repurchased and retired a total of approximately 0.3 million and 0.4 million shares of the Company's common stock, respectively, for total expenditures of approximately $30.0 million and $33.7 million, respectively. During the three and six months ended June 30, 2021, the Company repurchased and retired a total of approximately 0.2 million and 0.5 million shares of the Company's common stock, respectively, for total expenditures of approximately $18.9 million and $45.4 million, respectively.

Through June 30, ~~2022,~~2023, the Company has repurchased and retired a total of approximately ~~8.0~~8.3 million shares of its common stock for approximately ~~$478.3~~$502.7 million under this program. As of June 30, ~~2022,~~2023, an additional ~~$121.7~~$97.3 million remained available for repurchase of shares under this program.

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Environmental Liabilities


(in thousands, except percentages)	(in thousands, except percentages)	June 30, 2022		December 31, 2021		Change		% Change		(in thousands, except percentages)	June 30, 2023		December 31, 2022		Change		% Change
Closure and post-closure liabilities	Closure and post-closure liabilities	$	102,997	$	99,103	$	3,894	3.9	%	Closure and post-closure liabilities	$	120,708	$	118,801	$	1,907	1.6	%
Remedial liabilities	Remedial liabilities	123,656		111,873		11,783		10.5		Remedial liabilities	112,176		116,290		(4,114)		(3.5)
Total environmental liabilities	Total environmental liabilities	$	226,653	$	210,976	$	15,677	7.4	%	Total environmental liabilities	$	232,884	$	235,091	$	(2,207)	(0.9)	%

Total environmental liabilities as of June 30, ~~2022~~2023 were ~~$226.7~~$232.9 million, ~~an increase~~relatively consistent with the balance as of ~~$15.7 million compared to~~ December 31, ~~2021, primarily due~~2022. During the six months ended June 30, 2023, expenditures of $16.3 million were partially offset by accretion of $6.9 million, changes in estimates for the environmental liabilities, including those related to liabilities assumed in prior period acquisitions, of $4.7 million, and new liabilities of $1.9 million, including those assumed in acquisition, of $14.7 million and accretion of $6.4 million, partially offset by expenditures of $7.0 million. The majority of the new liabilities relate to a real estate acquisition in 2022 for which we are assuming a remedial liability. The remedial liability was contemplated when arriving at the amount paid to acquire the property.current period acquisitions.

We anticipate our environmental liabilities, substantially all of which we assumed in connection with our acquisitions, 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.

Events not anticipated (such as future changes in environmental laws and regulations) could require that payments to satisfy our environmental liabilities be made earlier or in greater amounts than currently anticipated, which could adversely affect our results of operations, cash flow and financial condition. Conversely, the development of new treatment technologies or other circumstances may arise in the future which may reduce amounts ultimately paid.

Letters of Credit

We obtain standby letters of credit as security for financial assurances we have been required to provide to regulatory bodies for our hazardous waste facilities and which would be called only in the event that we fail to satisfy closure, post-closure and other obligations under the permits issued by those regulatory bodies for such licensed facilities. As of June 30, 2023, there were $125.2 million outstanding letters of credit. See Note 12, "Financing Arrangements," to the accompanying financial statements.

Critical Accounting Policies and Estimates

Other than as described below, there were no material changes in the first six months of ~~2022~~2023 to the information provided under the heading “Critical Accounting Policies and Estimates” included in our Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022.

Goodwill and Other Long-Lived Assets. Pursuant to the previous succession announcement, effective March 31, 2023, Michael L. Battles and Eric W. Gerstenberg, were appointed co-CEOs and as a result, the Company’s new Chief Operating Decision Maker (“CODM”) is a committee comprised of both co-CEOs, who, going forward, will manage the business, make operating decisions and assess performance. The Company does not expect that the new CODM structure will change how the Company is managed and as such will continue to report as two operating segments; (i) the Environmental Services segment and (ii) the Safety-Kleen Sustainability Solutions segment and assess the recoverability of goodwill under three reporting units; (i) Environmental Sales and Service, (ii) Environmental Facilities and (iii) Safety-Kleen Sustainability Solutions.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

There were no material changes in the first six months of ~~2022~~2023 to the information provided under Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” in the Company's Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022.

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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 ~~Chief~~Co-Chief Executive ~~Officer~~Officers and Chief Financial Officer, as of the end of the period covered by this Quarterly Report on Form 10-Q, our ~~Chief~~Co-Chief Executive ~~Officer~~Officers and Chief Financial Officer have concluded that our disclosure controls and procedures (as defined under Rule 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) were effective as of June 30, ~~2022~~2023 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~~Co-Chief Executive ~~Officer~~Officers 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-15 or 15d-15 that was conducted during the six months ended June 30, ~~2022~~2023 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��~~II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

See Note ~~17,~~16, “Commitments and Contingencies,” to the unaudited consolidated financial statements included in Item 1 of this report, which description is incorporated herein by reference.

ITEM 1A. RISK FACTORS

There have been no material changes to the risk factors from the information provided in Item 1A. in the Company's Annual Report on Form 10-K for the year ended December 31, ~~2021.~~2022.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Common Stock Repurchase Program

The following table provides information with respect to the shares of common stock repurchased by us for the periods indicated.

Period
Total Number of Shares Purchased (1)
Average Price Paid Per Share (2)
Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs
Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs
(in thousands) (3)
April 1, 2022 through April 30, 2022 6,481 $ 112.93 — $ 151,748
May 1, 2022 through May 31, 2022 183,132 90.97 183,089 135,093
June 1, 2022 through June 30, 2022 151,817 87.94 151,768 121,748
Total 341,430 90.04 334,857


Period	Total Number of Shares Purchased (1)	Average Price Paid Per Share (2)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs (in thousands) (3)
April 1, 2023 through April 30, 2023	5,040	$	142.56	—	$	102,265
May 1, 2023 through May 31, 2023	36,820	137.17		36,473	97,265
June 1, 2023 through June 30, 2023	1,500	143.49		—	97,265
Total	43,360	$	138.02	36,473

________________

(1) Includes ~~6,573~~6,887 shares withheld by us from employees to satisfy employee tax obligations upon vesting of restricted stock granted to our employees under the Company's equity incentive plans.

(2) The average price paid per share of common stock repurchased under the stock repurchase program includes the commissions paid to brokers.

(3) Our board of directors has authorized the repurchase of up to $600.0 million of our common stock. We have funded and intend to fund the repurchases through available cash resources. The stock repurchase program authorizes us to purchase our common stock on the open market or in privately negotiated transactions periodically in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases has depended and will depend on several factors, including share price, cash required for business plans, trading volume and other conditions. We maintain a repurchase plan in accordance with Rule 10b5-1 promulgated under the Securities Exchange Act of 1934, as amended. During the three months ended June 30, ~~2022,~~2023, no shares were repurchased under the Rule 10b5-1 plan. Future repurchases may be made as open market or privately negotiated transactions as described above. We have no obligation to repurchase stock under this program and may suspend or terminate the repurchase program at any time.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None

ITEM 4. MINE SAFETY DISCLOSURE

Not applicable

ITEM 5. OTHER INFORMATION

~~None~~During the quarter ended June 30, 2023, no director or “officer” (as defined in Rule 16a-1(f)) of Clean Harbors, Inc. adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K.

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ITEM 6. EXHIBITS

Item No.

Description

Location

31.1

Rule 13a-14a/15d-14(a) Certification of the ~~CEO Alan S. McKim~~Co-CEO Michael L. Battles

Filed herewith

31.2

Rule 13a-14a/15d-14(a) Certification of the Co-CEO Eric W. Gerstenberg

Filed herewith

31.3

Rule 13a-14a/15d-14(a) Certification of the CFO ~~Michael L. Battles~~Eric J. Dugas

Filed herewith

Section 1350 Certifications

Filed herewith

4.43E

Amendment No. 3 to Credit Agreement, dated June 23, 2023, among Clean Harbors, Inc., as Borrower, and Goldman Sachs Lending Partners LLC, as Administrative Agent and Collateral Agent, to that certain Credit Agreement dated as of June 30, 2017, as previously amended, among the Financial Institutions party thereto, as Lenders, Goldman Sachs Lending Partners LLC, as Administrative Agreement and Collateral Agent, Clean Harbors, Inc. as Borrower, and the Loan Guarantors from time to time party thereto

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 quarterly period ended June 30, ~~2022,~~2023, formatted in iXBRL (Inline eXtensible Business Reporting Language): (i) Consolidated Balance Sheets, (ii) Unaudited Consolidated Statements of Operations, (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.

104

The cover page from the Company's Quarterly Report on Form 10-Q for the quarterly period ended June 30, ~~2022,~~2023, formatted in iXBRL and contained in Exhibit 101.

_______________________

* 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.

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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~~
			~~Chairman, President and Chief Executive Officer~~

~~Date:~~	~~August 3, 2022~~

		~~By:~~	~~/s/~~ MICHAEL L. BATTLES
			Michael L. Battles
			Co-Chief Executive Officer and Co-President

Date:	August 2, 2023

		By:	/s/ ERIC W. GERSTENBERG
			Eric W. Gerstenberg
			Co-Chief Executive Officer and Co-President

Date:	August 2, 2023

		By:	/s/ ERIC J. DUGAS
			Eric J. Dugas
			Executive Vice President and Chief Financial Officer

Date:	August ~~3, 2022~~2, 2023

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	At Acquisition Date As Reported December 31, 2021		Measurement Period Adjustments		At Acquisition Date As Reported June 30, 2022
Accounts receivable, including unbilled receivables	$	131,924	$	(395)	$	131,529
Inventories and supplies	3,162		—		3,162
Prepaid expenses and other current assets	16,016		363		16,379
Property, plant and equipment	313,540		—		313,540
Other intangibles	289,000		—		289,000
Operating lease right-of-use assets	34,347		68		34,415
Other non-current assets	1,045		(60)		985
Current liabilities	(115,704)		(883)		(116,587)
Current portion of operating lease liabilities	(11,659)		382		(11,277)
Operating lease liabilities, less current portion	(26,128)		(216)		(26,344)
Deferred tax liabilities	(85,908)		2,436		(83,472)
Other long-term liabilities	(2,685)		(242)		(2,927)
Total identifiable net assets	546,950		1,453		548,403
Goodwill (i)	683,463		(6,453)		677,010
Total purchase price	$	1,230,413	$	(5,000)	$	1,225,413


	Three Months Ended June 30, 2021		Six Months Ended June 30, 2021
Pro forma combined revenues	$	1,121,121	$	2,107,309
Pro forma combined net income	74,526		102,078


	Foreign Currency Translation		Unrealized (Loss) Gain on Available-For-Sale Securities		Unrealized (Loss) Gain on Interest Rate Hedge		Unrealized Loss on Unfunded Pension Liability		Total
Balance at January 1, 2022	$	(177,824)	$	(150)	$	(17,383)	$	(655)	$	(196,012)
Other comprehensive (loss) income before reclassifications	(7,326)		(830)		45,685		10		37,539
Amounts reclassified out of accumulated other comprehensive loss	—		—		5,358		—		5,358
Tax benefit (provision)	—		174		(9,761)		—		(9,587)
Other comprehensive (loss) income	(7,326)		(656)		41,282		10		33,310
Balance at June 30, 2022	$	(185,150)	$	(806)	$	23,899	$	(645)	$	(162,702)