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the life of the Foidel Creek Mine. The proposed adjacent area includes the Twentymile Park ground water <br /> basin, including the downstream reaches of the perennial streams of Fish Creek and Trout Creek to the <br /> confluence with the Yampa River at Milner. The proposed general area includes the Twentymile Park ground <br /> water basin and the watersheds of Fish Creek, Foidel Creek, Middle Creek, and Trout Creek to the confluence <br /> with the Yampa River at Milner. Information sufficient for a complete response to this section on the geology <br /> and surface and ground water systems for all lands within the general area described above is included under <br /> Rules 2.04.6 and 2.04.7 of this application. <br /> SOUTHWEST MINING DISTRICT <br /> The general information provided above can be applied to the Southwest Mining District. This area is located <br /> within the surface and ground water basins described above. Map 4, Proposed Hydrologic Area Boundaries, has <br /> been modified to reflect the permit revision. <br /> EASTERN MINING DISTRICT <br /> A strict application of these definitions to Twentymile Park results in the areas shown on Map 4, Proposed <br /> Hydrologic Area Boundaries. The proposed permit area includes all lands to be disturbed by mining activities <br /> over the life of the Eastern Mining District. The proposed adjacent area includes the Twentymile Park ground <br /> water basin, including the downstream reaches of the perennial streams of Foidel Creek, Middle Creek, and <br /> Trout Creek to the confluence with the Yampa River at Milner. The proposed general area includes the <br /> Twentymile Park ground water basin and the watersheds of Fish Creek, Foidel Creek, Middle Creek, and Trout <br /> Creel: to the confluence with the Yampa River at Milner. <br /> The general information provided previously can be applied to the Eastern Mining District. This area is located <br /> within the surface and ground water basins described above. Map 4, Proposed Hydrologic Area Boundaries, <br /> presents the area covered in this permit application. <br /> The around water inflow into the mine during the proposed longwall operation in the Eastern Mining District <br /> was calculated with the application of an analytical method (Maximov, 1975). Results of these calculations are <br /> presented in Exhibit 9A, Ground Water Inflow Into Mine, Eastern Mining District, Tables 1 and 2. These <br /> equations were developed for calculation of ground water inflow into horizontal sections of an underground <br /> nnine, and are the basis for the mine inflow calculations: <br /> q = KMs (7t/at)1/2 <br /> Where: q is water inflow per a longitudinal section of an underground mine(m3/day) <br /> K is hydraulic conductivity(m/day) <br /> M is hydrostatic head (m) <br /> s is drawdown <br /> a is coefficient of piezoconductivity (m2/day) <br /> a=T/S where T is transmissivity (m2/day) and S is storativity <br /> t is time of dewatering days <br /> The total inflow per(longwall panel) section of the mine or level is then calculated from: <br /> Q= qx1 <br /> Where: 1 is length of dewatered section (m) <br /> The total horizontal inflow per (longwall panel) section of the mine or level was calculated using hydraulic <br /> conductivity ranging from 0.034 to 0.098 ft/day. The geometry of the mined area and time of dewatering are <br /> based on mining plans. The analytical equation presented above was input into a simple spreadsheet computer <br /> program (LOTUS 123) on an IBM computer. The results of the inflow calculations for the Eastern Mining <br /> PR 14-10 2.04-10 03/18/16 <br />