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43 2.0 22.5 24.5 <br />44 9.0 15.0 24.0 <br />45 6.0 18.5 24.5 <br />46 3.0 20.5 23.5 <br />Average 4.3 20.1 24.4 <br />Since Area 2 is 34.67 acres in size, an average depth of 4.3 feet yields 240,500 cy of <br />soil/overburden. Part of the overburden and topsoil from Area 2 will be backfilled in part of Area 1 <br />to create a) 3h:1V sideslopes around the lake and b) provide a peninsula of land that will later be <br />used for industrial use. See Map F for the location of this piece as well as all other pieces of land <br />created in this manner. In order to make these pieces usable, the land level must be raised above the <br />100 year flood level, which is 4466' to 4467' above sea level at this location. <br />The remainder of the soil and overburden will be used to backfill the slopes of Area 2 and provide <br />fill for some areas that will be made into land parcels after reclamation. <br />During the mining of Areas 1 and 2, the Grand Junction Drainage District return irrigation water <br />will be channeled into the middle ditch as shown on Map C-2. Once Area 2 is mined out, a series of <br />3 - 4' diameter culverts will be placed under the Excel Energy/Western Slope Gas easement be- <br />tween Areas 1 and 2. The irrigation water will then be fed into the lake made from excavation in <br />Mining Area 2. This water will flow through the culverts and flow to the lake in Mining Area 1. At <br />this time, the sediment pond may not be used. A dike will be cut from the Area 1 lake to the origi- <br />nal drainage leading to the Colorado River. This dike will have a large discharge gate that can be <br />shut if needed, effectively making both lakes a large sediment pond. When topsoil/overburden <br />stripping of areas 3, 4 and 5 occws, one or more of these lakes may be temporarily drained to allow <br />the construction of the land areas. Water from this pumping, as well as return water from the irriga- <br />lion canal, will be redirected to the sediment pond. The spillway of the pond will be able to handle <br />up to 2000 gpm without causing erosion, which is a much higher rate than the water inflow, there- <br />fore, the pumping will reduce the lake level. Also, since the lake water has had considerable time to <br />settle, it will be clean and the sediment pond will simply act as a holding pond for the discharge. <br />All NPDES discharge requirements will be met. <br />IS Road Pit 10/02 10 <br />