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- ~ST~~N <br />-- - ~~_t>.~tt <br />INC. <br />- - a Su(uKlior7~ <br />of <br />WCSIPIR f°C~f <br />Avoarr[iorr, lnc. <br />May 15, 1996 <br />Mr. Dan Mathews <br />Division of Minerals and Geology <br />2148 Broadway, #C-5 <br />Grand Junction, CO 81503 <br />iii iiiiiiiiiiiii iii <br />999 <br />RE~EIV4~b <br />a^~~. <br />{tali <br />D+~i;,an of f.^.inerafa 8 dcoloQy <br />Grand Junctic~ <br />RE: Certification of Temporary Truck Dump Sediment Basin and Haul Road, REVISED". <br />Dear Dan: <br />The purpose of this letter is to certify that the Sediment Basin and Haul Road at the Temporary <br />Truck Dump were constructed in substantial accordance with the submitted and approved permit <br />documents. <br />I am a registered professional engineer in the state of Colorado and my experience fulfills the <br />requirements of the Colorado Surface Coal Mining Reclamation Act. <br />I have inspected the Temporary Truck Dump and Lay down Area and have noted the following: <br />The sediment control structures appeaz to be in place and functioning as intended. The sediment <br />pond covering the area is actually an incised basin excavated to provide 100% containment of a <br />25 year, 24 hour precipitation event. The design was based on the DMG suggestion made in a <br />letter to Murari Shrestha dated Feb. 16, 1996. A check survey of the basin showed that it will <br />contain nearly twice the required volume of 0.06 acre feet. All of the drainage from the newly <br />disturbed area and topsoil stockpile aze duected to this structure. <br />All of the newly disturbed azea and haul road was stripped of topsoil to a minimum depth of six <br />inches. This topsoil is stockpiled next to the sediment basin. <br />The newly constructed haul road appears to be functioning as intended. Inspections during <br />construction showed reasonable agreement with the submitted typical haul road construction <br />section Rl-b shown on Permit Map 67. The subgrade was substantially roll compacted with <br />Deserado Mine <br />P.0. Box 1067 <br />Rangely, Colorado 81648 <br />Telephone i0}/675 8431 <br />Telecopier 303/675-52?9 <br />