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U6~ 9ii: ~.) 1G:1J F.i\ 1 ,9 i~1 .A3 ~GG1 <br />ENVIROCON, INC. <br />9+00 souTH :a9 E~sr <br />SUITE ]t0 <br />MuPMY. VTGN 9~t01 <br />TEL EPHOHE~ (9017 ?989365 <br />FAX' I90t11B9.%6t <br />ENPIFiiCiiN, IM1'l, Idjnp~: up~ <br />`` l . ~I- <br />~y~ ~ II~~~~II~~~~ ~11 <br />ENCiIROCON, INC. <br />June 30, 1993 <br />Ms. Kathleen Welt <br />Mountain Coal Company <br />West Elk Mine <br />P.O. Boy 591 <br />Somerset, CO. 81434 <br />RE: DIVERSION DITCH ON THE WEST SIDE OF REFLISF. 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 on]y. <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 />o ve me a call. <br />S~ ~' \ <br />Charles C. Rehn, P.E. <br />General Manager <br />Salt Lake Citv Branch <br />AZ~/dl~Co mpeny <br />yyl c (~~ ~ 1 N <br />L~~'l~b <br />~~ <br />