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<br />` COLORADO DEPARTMENT OF HEALTH <br />Water Quality Control Division <br />4210 Eas[ 11th Avenue <br />Denver, Colorado 80220 <br />R2.TIONALE <br />ROCKCASTLE COMPANY <br />GRASSY GAP COAL MINE (formerly GRASSY CREEK COAL MINE) <br />PERMIT NUMBER CO-0035653 <br />ROUTT COUNTY <br />i <br />FACILITY TYPE: Industrial, Coal - Renewal <br />SIC NO.: 1211 <br />LOCATION: Sec. 20, 28, 29, 31, 32, TSN, 88741, <br />approzimately ten miles southeast of Hayden, CO <br />LEGAL 6 LOCAL CONTACT: Robert H. Sherman <br />Mine Manager <br />P.O. Boz 773987 <br />Steamboat Springs, CO 80477 <br />(303)+879-6785 <br />RECEIVING {iATERS: Grassy Creek <br />SUB-BASIN, SEGMENT: Segment 12, Yampa River Sub-basin, Upper <br />Colorado River Basin <br />CLASSIFICATION: Recreational, Close 2 <br />Aquatic Life, Class 2 (Cold) <br />Agricultural Uee <br />Q7-10 (Stream low-flow): N/A, limitations are not flow-based <br />DESIGN FLOW: Sedimentation ponds contain and treat 10-year, <br />24-hour precipitation event <br /> <br />