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1 <br /> <br />1 <br /> <br /> <br />C~ <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />.~ <br />EYHIBIT D (Cont'd) <br />because of low production rates, five-year mining stages are <br />planned to occur simultaneously with mining stages in the <br />wet area.. <br />At the beginning of each stage any topsoil present ir. <br />the floodplain area will be removed and stored in the area <br />at the edge of the property not to be mined. Special atten- <br />tion will be given to problems of erosion, wind disturbance <br />and other climatic factors peculiar to the area. <br />Much of the nonsoil overburden will be used to back- <br />fill the westernmost pit area ~.vhich is in the final stages <br />of excavatio^ at this time. The average overburden ~.s <br />approximately four feet in depth, but there are a few small <br />areas along the base of the south cliff line where as much <br />as fifteen feet of overburden is encountered. <br />The top of the exposed gravel is generally within one <br />or two feet of the v;ater table. Dewatering is the next step <br />in each ruining stage in order to facilitate extraction ir. a <br />dry pit. Water thus removed is pumped from the pit area into <br />the Gunnison River under Colorado Lepartment of Health 7~'PDES <br />Permit No. CO-0029092 (see Exhibit N). The exception to <br />dewartering is the bench gravel scuth of the cliff line <br />in the southernmost. area. This entire deposit is above the <br />water table and is operated as a completely dry pit area. <br />All pit run material is removed to a permanent offsite <br />processing plant which crushes, screens and segregates the <br /> <br />