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EXHIBIT "D" _ MINING PLAN (Technical Revision 6-20-85, Page 3) <br />high-intensity precipitation event. From the National Oceanic and Atmospheric <br />Administration, in 29 years for Canon City, the heaviest one day rainfall during the <br />period of record was 2.74 inches. A 3 ft. deep channel sloping at approximately <br />1. 5% will be constructed to the west with rock placed at the bottom of the channel to <br />prevent erosion and sedimentation. (See Drawing "A". ) <br />All slopes in the mined area will be sloped to a 2 1/2:1 slope, compacted and <br />seeded with the seed mixture in the Reclamation Plan to prevent erosion and <br />sedimentation. <br />The water that collects in the mined area will be allowed to drain at 0. 5% grade <br />from the back wall towards the north and west edges of the terrace. Presently, please <br />note tha t the elevation of Highway 115 is 5, 325 ft. ; the elevation at 2 f 1 is 5, 258 ft. <br />11~ It <br />and the Section Corner elevation at the base of the terrace is 5, 258 ft. (See Map in <br />Exhibit "C") Therefore, the majority of the water runs to the north and east side at <br />the top of the terrace and runs through five water channels down to the irrigation canal. <br />The opaator will cut these channels to a depth of three ft. lined with rock and compact <br />the sides to prevent erosion and sedimentation at a slope of 2 1/2:1, as outlined in blue on <br />Drawing "B". This will allow the water to drain through the irrigation ditch. The <br />operator will also plane rip-rap along the head of these channels to prevent erosion <br />and sedimentation. <br />The operator will place a 3 ft. overburden and concrete berm along the top of <br />the mesa and thus allow the water to run through only one channel as outlined. As <br />the mining proceeds, the operator will use the same drainage plan for the north and <br />west side (See map, Exhibit "C" in red) which will drain into the natural drainage <br />found on the west side as outlined on the map. The operator will have a buffer of <br />undisturbed land on the north west side and will build a berm along the edge of this <br />3 ft. high to stabilize the sides by channeling the runoff to the one drainage channel <br />