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2.04.5 (1) <br />• The alluvial aquifers and glacial deposits overlying the Red Canyon <br />A 1 Mine and proposed # 2 Mine site will be affected by the mining <br />operation in the immediate vicinity of the subcrop of the "D" and "E" <br />coal seams. However, these effects will be minimized by limiting <br />the mining operation an adequate distance from the subcrop itself to <br />eliminate significant induced recharge from the base of the alluvial <br />aquifer. The beds dip three to four degrees to the north, and <br />the base of the alluvial material rises to the north at approximately <br />the same rate (refer to the Isopach Map-Alluvial Aquifers, 2.04.5-3, <br />and the Geologic Cross Section Maps, 2.04.5-4 and 2.04.4-5). Ckioe the coal has <br />dipped 250 to 400 feet north from the subcrop, it is buried by <br />25 to 30 feet of relatively impervious clays tone and shale material. <br />This prevents direct vertical recharge from the alluvium and minimizes <br />the additional amount of water which can be transmitted through the <br />fractured coal, due to the affects of compaction on the coal seam. <br />The amount of water anticipated to be induced by the mining activity <br />is small considering the storage capacity and transmissivity of the <br />• alluvial material itself. <br />SURFACE WATER SYSTEM. <br />Surface drainage systems within or adjacent to the permit area of <br />tfie Red Canyon (-1 Mine and proposed A2 Mine are Ward Creek,D)illiams Creek <br />^_otton~aood Creek, Riser Creek, Rvaell Draw and agricultural irrigation systems. <br />The complexity of irrigations systems in total would be difficult <br />to show; therefore, on Drawing 2.04.5-1 the location of ditch <br />diversions from Ward Creek and Williams Creek are keyed on a <br />portion of a USGS Quad Map. These numbers correspond to the list <br />(Table 2.04.5-1) of ditch names, priority number and appropriation. <br />Runoff irrigation coming onto the yorth end of the mine site is <br />mainly from Sunrise Ditch (10), runoff from the mine site is <br />contributary to Carbon Ditch (13). Carbon ditch run-off is <br />contributary ultimately to Ward Creek. <br />Flow records of the creeY.s can be found in the Hydrology Description, <br />Section 2.04.7. <br />C J <br />RF.viSED May 8, 1981 <br />50 <br />