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Revised October, 1989 • <br />assumed that in general-the bedrock will be encountered at about <br />live feet below the existing ground surface on ateeg slopes. The <br />cut slopes proposed will be 1.5H:SV in soil and 0.2ffiH:ly in rock <br />to be consistent with others at the mine. However, these cut <br />slopes and sections may need to be revised during the construction <br />phase, depending upon depth to bedrock and actual field conditions. <br />I! substantial revisions to the road design are necessary, the <br />appropriate permit revision requests will be made to the CMLRD. <br />Prior to the road construction, a reconnaissance geologic map will <br />be completed on the Upper Waste Pile access roadway corridor with <br />emphasis on the detection of slope instabilities and drainage <br />characteristics. Utilizing the results of the reconnaissance <br />geologic mapping and adjoining surface facility rood d®mign <br />studies, WECC will complete a preliminary access road cut-elope <br />stabilization and drainage design. This design will be submitted <br />for the Division's approval prior to any disturbance of the access <br />road corridor. <br />Initial construction of the Upper Waste Pile access road will be <br />as a pioneer road with minimal excavation. A final geotechnical ' <br />investigation o! the pioneer road cut-slcpes will then be completed <br />to verify, or amend as necessary, the findings of the • <br />reconnaissance geologic mapping of the road corridor. Utilizing <br />these findings, wECC will prepare a final cut-elope and drainage <br />design for the access road. The Division's written approval of the <br />final design will be received and construction completed in <br />accordance with the designs prior to the transportation of any <br />waste material along the access road. <br />vegetation will be removed prior to stripping topsoil from the <br />access road site. Topsoil from the access road w111 be stockpiled <br />in a pile within the area shown on Drawing MG-R-C-001 designated <br />as the 5pai1 Stockpile Area. A dozer blade width buffer zone <br />between Copsofi stockpile and roadcut spoil stockpile will be <br />maintained. Because the access rohd will remain open following <br />reclamation of the mina sits, the topsoil from the road cut will <br />be used as seedbed quality material for reclamation of the refuse <br />pile itself or for othez disturbed areas around the mine site. In <br />the meantime, the topsoil stockpile will be seeded with the <br />permanent seed mix described in Table 4.4.5.A of the Mt. Gunnison <br />M and R Plan. <br />Following removal of the topsoil, the additional excavated material <br />will be stockpiled at the top of the hill as <br /> <br />-32- <br />