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uti'Ju: 9J 16:1J F.~S 1 5n1 .•98 9GG1 ER\"iFi!c:i hV. I`!'. ~p11°~ 11O° <br />• ENVIROCON, INC. <br /> wro souTH ..e EAST <br /> swrE m9 <br /> wUPRAY. Ut4v. $a,p} <br /> TELEPHONE' 190,) ]969966 <br /> FA%: 100,1 ]9&9661 <br />ENCiIROCON, INC. <br />• <br />• <br />June 30, 1993 <br />Ms. Kathleen Welt <br />Mountain Coal Company <br />West Elk iVIine <br />P.O. Bas 591 <br />Somerset, CO. 81434 <br />RE: bIVERSION DITCH ON THE WEST SIDE OF REFUSE PILE <br />Dear Kathy: <br />Per your request, we have reviewed the hydrology on the west side of the <br />refuse pile. It is proposed to place a diversion berm along the southwest ditch. Tlus <br />berm will be constructed approximately two feet high with a 2H:1V slope. The <br />purpose of the berm is to divert clean surface water from entering the southwest <br />ditch. Water will not be stored by this berm, as it will act as a diversion only. <br />However, the 100 year storm event is only 2.6 inches. Depth of water at any given <br />time behind the diversion berm will not exceed more than two inches. <br />If you have any further questions concerning this letter of certification, please <br />e ve me a call. <br />S~ e' <br />Charles C. Rehn, P.E. <br />General Manager <br />Salt Lake City Branch <br />AZ 2 M.Compeny ~~ <br />