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148 0.07 <br />Runoff from the 1 0.20 0.0 <br />cutslope and into <br />the slope from the <br />tank and pad <br />(Attachment 3) <br />148 0.07 <br />0 0 I <br />Runoff from the 0.20 <br />tank and pad away i I <br />from the slope I <br />(Attachment 4) <br />Velocity <br />Description Depth (with Freeboard) <br />I 0.47 feet 1.37 feet per second (fps) <br />Interceptor Ditch <br />(Attachment 5) <br />I 0.04 feet 0.57 fps <br />Point Discharge I <br />(Attachment 6) <br />7. CONCLUSIONS graveling <br />tank Best management practices o of <br />i/i following he <br />10 yeara24-hour <br />utilizing an upper cleanwater the site meeting effluentstandaords of 0 5 and <br />water tank result in discharge from <br />storm event. <br />Best management practices of ditch feather distribution and hay bales for point discharge energy dissipation <br />are highly recommended as part of the facility. <br />A small area exemption is warranted. <br />CERTIFICA'T'ION <br />This certification is limited to office design, based on physical descriptions and site conditions <br />information provided by Kathy Welt, Environmental and Engineering Supervisor, West Elk <br />Mine, Mountain Coal Company. L.I. analysis is good engineering practice, and conclusions <br />reached, based on the information provided, are valid to the best of my knowledge. A Small <br />Area Exemption is warranted under current rules. <br />eo5rV? . alker, P.E. <br />Colorado Registration Number 18378 <br />Date: 9 <br />5