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Mine: Colowyo Coal Mine <br />Permit No.: C-1981-019 <br />Permitting Action: TR-90 <br />SAE Checklist zT pe,Ks <br />l'.e w-E w <br />Date checklist completed: 5/16/11 <br />DRMS reviewer: Tom Kaldenbach <br /> Regulation <br />Requirement Regulation complied Comment <br /> citation with ? (yes <br /> / no) <br /> Design includes the following sediment <br /> control measures: an earthen berm and <br /> shallow v-ditches or drainage swales. The <br /> submittal contains SEDCAD runs <br /> demonstrating the adequacy of these measures <br /> for controlling sediment in a 10-yr., 24-hour <br />Demonstration that effluent <br />limitations and water precipation event. A SEDCAD run for a 25- <br /> <br />quality requirements for year event was also included. The SEDCAD <br />downstream waters can be 4.05.2(3)(a) Yes runs used reasonable input variables. The 3.1- <br />met without a sediment acre disturbed area in the SAE consists of a <br />pond or other treatment. 2.7-acre topsoil stockpile and a 0.4-acre <br /> access road. Runoff from the disturbed area <br /> can be expected to be alkaline with no <br /> formation of leachates or increase in the <br /> parameters for which there are instream <br /> standards. <br />Disturbed drainage area is <br />small 4.05.2(3)(b) Yes 3.1 acres <br />No mixing of surface <br />drainage with u.g. mining 4.05.2(3)(b) Yes No u.g. mining discharge into SAE. <br />discharge <br /> <br />Page 1