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Revised April, 1984 <br />• The rate of recharge in the overburden aquifer is controlled by <br /> the asount of precipitation, the infiltration characteristics of the <br /> overlying soils, and the horizontal eatent of the recharge area. <br /> Dsing an average annual precipitation of 16 inches, and as <br /> infiltration capacity of 20I from Soil Conservation Service <br /> information on the „soils covering the proposed permit area, it <br /> follows that 3.2 inches per year (0.27 feet per year) should be <br /> available for ground water recharge. In the undisturbed condition, <br /> the original horizontal eztent of the overburden aquifer recharge <br /> area was 73 feet wide aad 20,000 feet long, covering 33.5 acres <br /> within and adjacent to the proposed permit area. ?lultiplying the <br /> infiltration capacity of 0.27 feet per year times 33.5 acres gives a <br /> recharge capacity of approzimately 9 acre-feet per year, or <br />• approai~ately 154,000 gpd/aq. mi., for the overburden aquifer, <br /> prior to disturbance by mining in the proposed permit area. <br />Ground Water Storage Characteristics <br />Storage characteristics in the overburden aquifer were <br />determined from pump teats, as Listed in Table 27, Aquifer <br />Characteristics. The storage coefficient of the overburden aquifer <br />where it is not faulted, is 1.12 a 10-5 (no unite). A fault with a <br />atratigraphic displacement ranging from 60 to 100 feet rune <br />northwest-southeast through the proposed permit and adjacent area. <br />The amount of storage in the overburden aquifer was calculated using <br />. the method of Lohman (1972, page 8), as follows: <br />2.04-41a <br />