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COLORADO DEPARTMENT • HEALTH <br />' blater Quality Control Division <br />4210 East 11th Avenue <br />Denver, Colorado 80220 <br />• <br />SUMMARY OF RATIONALE <br />PEABODY COAL COMPANY <br />MESA GRAVEL PIT <br />PERMIT NUMBER: CO-0037656 <br />ROUTT COUNTY <br />TYPE OF FACILITY: <br />SIC N0: <br />Minor Industrial - New <br />1442 <br />LOCATION: In the Southwest ~ of Section 17, and the <br />Southeast ~ of Section 18, Township 6 North, <br />Range 87 West, about 5 miles east of <br />Hayden, Colorado. <br />CONTACTS: Leonard Shearer <br />12015 East 46th Avenue Suite 600 <br />Denver, Colorado 80239 <br />(303)+37t-7990 <br />RECEIVING WATER: An unnamed tributary to Sage Creek <br />• Recreation - Class 2 Agriculture <br />CLASS: Aquatic Life - Cold, Class 2 <br />Effluent Limited Segment <br />DESIGN FLOW: N/A <br />FACILITY DESCRIPTION: The facility is a gravel extraction operation. <br />The total pit area is about 10 acres, and will <br />take about two years to mine, operating from <br />May to November. Future expansion to the west <br />is possible. <br />A sedimentation pond is located directly <br />northwest of the pit- The pond is designed <br />for containment of a 10-year, 24-hour <br />precipitation event. <br />Discharge will consist solely of groundwater and <br />storm runoff. No process water is used at the <br />site. Drainage upslope of the pit will be <br />diverted around the pond. <br />• <br />