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• Sc = HAS <br />Where: Sc = storage capacity, acre-feet <br />H piezometric bead difference from the recharge <br />area to the discharge area, feet <br />A =aquifer area, acres <br />S =storage coefficient <br />Dsing a 100 foot change in elevation of piezometric head shown <br />on Map 4, Hine No. 3 Hydrology, an aquifer area of 700 acres east of <br />the fault, and an average storage coefficient of 1.12 a 10'5, the <br />amount of eater under compression in the overburden aquifer vas <br />found to be 0.8 acre-feet. The amount of water in storage is derived <br />from the specific yield of aquifer (approximately 0.15) multiplied <br />by the aquifer volume. The storage volume is calculated as 700 <br />acres z 73 feet a 0.15 = 7665 acre-feet. Total ground eater storage <br />. in the permit and adjacent area is 0.8 + 7665 7666 acre-feet. <br />Ground Water Hovement <br />Data collected from piezometers completed in the strata <br />overlying the Wadge coal seam were used to interpret the elevation <br />of the piezametric surface. Information on ground water monitoring <br />is presented is Exhibit 15, Hydrologic Monitoring Plan. 6levationa <br />of ground water levels in the overburden aquifer were used to <br />construct the piezometric surface contours on Map 1, Twentymile Park <br />Hydrology, and Map 4, Mine No. 3 Hydrology. Pump test data (Energy <br />Fuels, 1979) and atreamflov data (Boettcher, 1972) document that <br />• Foidel and Middle Creeks are hydraulically occluded from ground <br />water contribution, and that the watershed of Fish Creek <br />2.04-42 <br />