ACCRUED CAPPING, CLOSURE AND POST CLOSURE (Tables)

3 Months Ended

Jul. 31, 2012

Changes to Accrued Capping, Closure and Post-Closure Liabilities

The changes to accrued capping, closure and post-closure liabilities for the three months ended July 31, 2012 and 2011 are as follows:

	Three Months Ended July 31,
	2012			2011
Beginning balance	$	39,629		$	36,407
Obligations incurred		1,084			756
Accretion expense		899			835
Payments		(1,119	)		(316	)
Ending balance	$	40,493		$	37,682