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<br />Exhibit D <br />Mining Plan <br /> <br />(a) Descriptions ojrhe methods ojmining to be employed in each stage ojthe operations as related to the <br />surface disturbance on affected lands, <br />The sand and gravel mining at the proposed site, for all phases of the project, will be by open pit <br />method. The sand and gravel will be extracted utilizing large earthmoving equipment, including <br />bulldozers, trackhoes, scrapers, motor graders and front-end loaders. Once removed, the sand and <br />gravel will be sorted using various screens, and crushed on site. Once the materials have been <br />processed, they will be stored on the project site or loaded into dump trucks. A portable weight <br />scale facility will be installed near the southwest comer of the project site. <br />The proposed sand and gravel mining pit property is approximately 38 acres in size, and is a <br />square shaped property one quarter mile in size (1280 ft by 1280 ft). With the Ciry of Grand <br />!unction setbacks and buffers requvements, 32.5 acres will be actually be mined for sand and <br />gavel. <br />Access to the project is will be located near the southwest comer of the property, which is the <br />current access point for the material storage and processing operations presently being conducted <br />on the project site. Haul roads within the project site will vary depending on the exact location of <br />the mining and stockpiled areas. In general, the processing equipment and material stockpiles will <br />be located near the center of the project. A weight scale will be located near the access gate at the <br />southwest corner of the project. All roads within the project site will be gravel to control dust. <br />(b) Earthmovtng <br />Initial earthmoving on the project site will be performed to ensure all drainage will 6e contained <br />within the project site. This will require a surface drainage Swale to be installed along the <br />southern edge of the project site to contain surface flows within the project area. The drainage <br />Swale will slope towards a new retention pond, which will be excavated near the west property <br />line. Another drainage Swale will be cut along the north and northwestern portion of the project <br />site to collect runoff from within the project site and divert it to the new retention pond. <br />The new retention pond, located along the west property line, will be sized to retain the 100-year <br />storm event, az specified in [he May 1996 edition of the Stormwater Management Manual for the <br />City ojGrand Junction and Mesa County. The pond will have a storage volume of approximately <br />109,000 cubic feet, and will be approximately 600 ft long by 50 ft wide, and 6 ft deep. <br />Earthmoving for the sand and gavel mining operations will consist of excavating the overburden <br />soils, mining the sand and gravel, and backfilling the excavated areas using overburden soil and <br />imported site materials. <br />The site will be mined in two phases, with the first phase of the project consisting of the eastern <br />half of the property, approximately 17.2 acres in size, and the second phase consisting of the <br />western half of the property, approximately 15.3 acres in size. Within each phase of the project, <br />approximately 5 acres will worked at any one time. Each phase of the mining operations is <br />estimated to require five years to complete. <br />Earthwork operations far the first phase of the project will begin at the northeazt comer of the <br />project site. Overburden soils will be removed and stockpiled in the Phase ll area, adjacent to the <br />excavated area. Next, the sands and gravel will be mined using trackhoes, front-end loaders, and <br />