Altair Disposal Services S-4 Registration of securities issued in business combination transactions

EXHIBIT 12.1

Ratio of Earnings to Fixed Charges

CLEAN HARBORS, INC.

Offer to Exchange 5.25% Senior Notes due 2020

Registered under the Securities Act of 1933 for

All Outstanding Unregistered 5.25% Senior Notes due 2020

	For the Six Months Ended June 30,						For the Year Ended December 31,
	2012			2011			2011			2010			2009			2008			2007
	(In thousands)
Income from operations before income taxes	$	86,620		$	80,273		$	184,678		$	184,477		$	61,472		$	93,977		72,238
Add (Subtract):
Capitalized interest	(49		)	(393		)	(451		)	(541		)	(236		)	(157		)	(1,179		)
Amortization of capitalized interest	362			377			678			616			567			541			435
Fixed charges (see calculation below)	27,790			21,672			46,260			35,620			23,511			18,736			22,897
Income from operations before income taxes as adjusted	$	114,723		$	101,929		$	231,165		$	220,172		$	85,314		$	113,098		$	94,391
Fixed charges:
Interest expense, net	$	22,240		$	17,120		$	39,389		$	27,936		$	15,999		$	8,403		$	13,157
Interest income	402			546			798			874			825			623			4,023
Capitalized interest	49			393			451			541			236			157			1,179
Amortization of capitalized interest	(362		)	(377		)	(678		)	(616		)	(567		)	(541		)	(435		)
Preferred stock dividend	—			—			—			—			—			—			332
Portion of operating lease rental expenses deemed to be representative of the interest factor	5,461			3,990			6,300			6,885			7,018			5,624			4,641
Fixed charges	$	27,790		$	21,672		$	46,260		$	35,620		$	23,511		$	18,736		$	22,897
Ratio of earnings to fixed charges	4.1x			4.7x			5.0x			6.2x			3.6x			6.0x			4.1x