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8/22/2016 State.co.us Executive Branch Mail - Fwd: FW: FW: FW: LorencitoTR-19 Adequacy Letter Response <br />For example, for Pond 5, the original designed sediment elevation is 6760.6 ft for disturbed conditions. For <br />post -mining condition, the sediment input is about 0.3 ac -ft, which is equivalent to 0.3 ft in height. That makes <br />the sediment elevation 6760.9 (= 6760.6+0.3). <br />The sediment elevation could be over-estimated if the existing elevation is lower than the original design <br />elevation mrany previous dean-ou1. <br />Frmnn:Zuber DNR, Rob [mailto:robzuber@state.cous] <br />Sent: Monday, July 1D'2016O:O6AK4 <br />To: Ron Thompson <nonthompson@nem/e|kcoa|.com> <br />Cc: Koblitz, Jerry <Jerry.KobIitz@arcadis.com>; Louis Head <Ihead@newelkcoal.com>; Jim Begano <br />^jimb@newel kcoa|.com> <br />Subject: Re: FW: FW: LnvencitoTR'19Adequacy Letter Response <br />| agree that approach is reasonable, Ron. <br />However, | am having trouble understanding the reported numbers in the table. For Pond 05, the sediment <br />elevation went up slightly (6760.6 to 6760.9) but the volume decreased by over 90% (37 to 0.21 ac -ft). Can you <br />guys give me a little more explanation on that? | imagine | am missing something simple. <br />ims <br />hftps://mai|.google.com/mail/u/0/?ui~2&i�e29129fcb5&vi ew=pt&search= inbox&th= 1m|~156a43fcd264089u 4/10 <br />