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STATE OF COLORADO <br />D[VIS??N DF RECLA?ATI?N, M[NING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 2 ? ? <br />Denver, Colorado 8203 <br />Phone: ?3?3? 866.3567 <br />FA??: X303) 832-81 ?6 <br />II?T?I????I? MENI??D?1VI <br />'?I?: Dan. Mathews <br />?R? Mike Boulay <br />I]ATE; September 1$, ??a9 <br />UBJET: Seneca II- permit ?Io, C?B?»?5'1, Technical Revision No. 67 QTR-?7} <br />Yoast Mine permit Na, Cy94-a$?, Technical Revision o? 4D QTR-?43} <br />Runoff Control structures <br />??LQRA]]? <br />DIVtSI?N D? <br />R?CI,AMATION <br />DINING <br />?^. <br />?A? ?T'Y <br />?il? River, fir. <br />Governor <br />Harris D, Sherman <br />Executive Director <br />Ronald VY. Cottony <br />Division Director <br />Nat+?rai Resource Trustee <br />I have reviewed TR-67 and TR-43 which were submitted b? ?? to provide design information for <br />proposed runaffcontrol structures at Seneca II- and Yoast Mines, Y have the fallowing comments <br />that should be forwarded to eneea Coal Corr?pany. <br />1. Because these structures X111 control nofffrom disturbed areas, all afthese proposed <br />structures must be located along drainages hydraulically up-gradient from an approved <br />sedimentation panel that has a ?]P permit. please add a statement to the revised tent on <br />page 1S, Tab ?? QTR-?7} and to page 11, Tab 2a QTR-4}that these will be Xocated up- <br />gradient from existing sediment ponds with approved CDP permits. <br />2, The permit text should be modified in Tab ?0 pages 1 S and 1 ? far Seneca II- and <br />Yaast, respectively to include a statement that these runoff control structures are not <br />intended to impound v?ater, The design, contruCtian, and maintenance of these <br />structures must ensure that vsrater ?lo?s through the control structure following a storm <br />event. <br />3. ?Ve have received comixa.ents regarding the pxoposed runoff Control structures from the <br />I)1v1S10r1 ofater Resources, 1nCC the strl?cture 1 Sllb?ect t0 adminlstratlQn 1t must no store <br />water out-of?priority, Ali storage must be drained Bona the runoff Control structures v?ithin <br />t?entywfaur hours or as directed by the division engineer andlor water commissioner, please <br />provrde a response and approp?ate design changes to comply with the DAR directive. The <br />?]'R's memorandum from Craig M. his, P.?., dater Resources engineer is attachedi <br />Dff ice of ?fra ce of <br />Mined land Reclamation Denver + Grand function ? Durango Active and Inactive Mines