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T <br /> <br />DE PAIi LdC.NT OI rlAf UIiAL IIC'iOIIfICC.`i <br />D Mo nlu P, :ca4 E+UCUrwC U~rccun <br />MIN~U I~ANU 121:CLAMA'I'IUN <br />423 Cenlen nial Budding. 1313 Shaman Street <br />Denver, Colorado 80203 Tcl (303) 066-3561 <br />David C. Shelton <br />Director <br />November S, 1987 <br />Water puality Control Di. vi.sior7 <br />Colorado Department of llf~altll <br />4210 East 11th Avenue <br />Denver, Colorado 80220 <br />Attn: Sandy Squires <br />Re: Ohio Creek Mine No. 7. <br />Our File No. C-002-80 <br />Dear Sandy: <br />In response to our telr_phone c•onversaCion fin October 28, 1981, the Colorado <br />Mined Land Reclamation Division h•~s rcvicwrd nnrl approved the sediment control <br />plan for the Ohio Creek l4iuc' No. 2 (OC 112) under the provisions of Rulc 4.05. <br />OC b2 is a small underground coal mine (3.2 acres of disturbance) with one <br />sediment pond. The sediment pond is already in existence and has been <br />designed to contain the runoff from a 10-year, 7.4-hour precipitation event. <br />The emergency spillway is designed to safely pass the peak flow from a 25-year, <br />29-hour precipitation event- The pr.inc•ipal spillway/dewatering device is a <br />trickle tube which allows for a retention time of 24 /lours. <br />IF you need further information, please call me. <br />,Sincerely <br />~ ~~ ~~ <br />~. <br />J~m llerron <br />Reclamation Specialist <br />Jfl /mt <br />