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a) Method of Mining <br />EXHIBIT D <br />Mining Plan <br />It is the applicant's intent to commence sand and gravel excavation, processing (rock crushing and <br />screening), and stockpiling at the Pawnee Aggregate Pit upon receipt of approval from the Colorado <br />Division of Reclamation, Mining and Safety as well as other necessary permits. Gravel extraction and <br />processing will be seasonal, as the mine will be operating for less than 180 days of the year and operations <br />will resume within one year. Stockpiling of gravel for future use shall be dependent on County, <br />Government, and Oil and Gas industry needs. The estimated excavation and stockpiling volumes is <br />approximately 100,000 tons per year. The Pawnee Aggregate site is expected to have 7 years of gravel <br />and sand reserves. <br />The Pawnee Aggregate Mine will be a standard truck and loader operation. The main operating unit will <br />consist of a crusher and screening unit and a conveyor staking unit which will place the screened material <br />into product type stockpiles. <br />Access from the site shall be from an existing drive within the County's prescriptive right -of -way for WCR <br />99. The proposed access road for the site will be 30 feet wide and the internal haul road will be 24 feet <br />wide. These widths will be adequate for the level of anticipated truck traffic associated with the pit. <br />As material is sold from the operation a truck scale will be used to record and bill the material sales. <br />b) Earth Moving <br />Overburden will be removed by dozer and truck and loader operation. Topsoil will be stripped and <br />stockpiled separately for replacement at the time of reclamation. To remove overburden, the dozer will <br />initially rip the material and either doze the material into a spoil lift or into a stockpile for the truck and <br />loader operation. No explosives are anticipated to be used. <br />The gravel zone, which ranges from 9 to 11 feet in thickness, will be mined with the truck and loader units. <br />The trucks will transport the material to the crusher / screening area for product sizing specifications. <br />Stackers will place the material into selected stockpiles. <br />c) Water Diversions and Impoundments <br />Rain and snow melt are expected to be quickly absorbed into the zones. In areas where sheet flow can be <br />expected, swales and berms will be designed and constructed to transport the flows into the natural <br />drainage areas. A water quality pond or similar feature will be used to handle the first flush flows prior to <br />release in the natural drainage areas. <br />1 <br />