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• Although it is difficult to accurately quantify the amount of ground water discharging <br />from the permit area, ground water movement can be estimated using Darcy's Law: <br />q = -kmi <br />where: <br />q = the quantity of flow per unit,aq uifer width <br />k = hydraulic conductivity <br />m = aquifer saturated thickness <br />i = hydraulic gradient <br />Hydraulic conductivity values (k) are from Table 7-(l, "Summary of Specific Aquifer <br />Characteristics for Seneca II-W Mine" (see Page 32). Values for m, aquifer saturated <br />thickness, were determined from lithologic logs for wells installed in the permit area. <br />Hydraulic gradient (i) values were measured from the potenti ometric surface maps for each <br />aquifer (Exhibits 7-2 through 7-4). Average values for k, m, and i are shown below. <br />k = 2 x 10_1 ft/day (Wadge Overburden) <br />k = 3 x 102 ft/day (Wadge Coal) <br />k = 4 x 10 3 ft/day (Wolf Creek Coal) <br />~J <br />m = 62.5 ft (Wadge Overburden) <br />m = 9.1 ft (Wadge Coal) <br />m = 20.5 ft (Wolf Creek Coal) <br />i = -0.11 (Wadge Overburden) <br />i = -0.09 (Wadge Coal) <br />i = -0.11 (Wolf Creek Coal) <br />therefore: <br />q = 1.38 ft=/day (Wadge Overburden) <br />q 0.02 ftz/day (Wadge Coal) <br />q = 0.009 ft'/day (Wolf Creek Coal) <br />C ro and water movement through the permit area is predominantly to the west (see Exhibits <br />7-2 through 7-4 ). The permit area is about 9800 feet long at its maximum north-south <br />extension; therefore, the total flow (0) through the permit area can be calculated for <br />• each aquifer: <br />25 <br />