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Section 779.15(a) Continued. <br />.~ <br />Revised 11/20/80 <br />fault zone in Section 26, T9N, R78W, the coal aquifer has an aver- <br />age permeability of 16.5 gpd/ft2, storage coefficient of 1.8 x <br />10-4, and an average yield of more than 20 gpm. These values mean <br />that the Sudduth coal seam is a confined artesian aquifer and, <br />where it has been locally fractured by faulting, the coal aquifer <br />can store and transmit water in sufficient quantities for a spe- <br />cific use. <br />The elevation of the piezometric surface of the coal aquifer is <br />shown on Map 15a, Kerr Mine Area Ground Water Hydrology. Water <br />level elevations measured once per month in the bedrock monitor <br />wells were used to depict the contours of the piezometric surface <br />on the map. Where the density of data was not sufficient to deter- <br />mine the exact elevation of the piezometric surface, contour lines <br />were not drawn. The data used to construct the map are contained <br />in Table 8a, Kerr Mine Area Ground Slater Level Data. <br />• <br />The elevation and flow of ground water at any one location is <br />affected by three factors; elevation of the recharge area, gradient <br />of the piezometric surface, and geologic structure of the confined <br />aquifer. A good example of how the elevation of a recharge area <br />affects ground water elevation is shown on Map 15a, Kerr Mine Area <br />Ground Water Hydrology, in the middle and southeastern portions of <br />..~ sa~W. <br />Section 26, in the vicinity of monitor well~`/9-40. The elevation <br />of the aquifer outcrop near well 79-40 is about 8350 feet, whereas <br />the outcrop elevation near well `DH-4, just to the north, is 8150 <br />feet. Since the aquifer is recharged at the outcrop, the measured <br />water levels and piezometric surface contours in the vicinity <br />reflect this change in outcrop elevation. Ground .water flows in <br />the direction of the piezometric surface gradient, from high to low <br />elevation. The migration of ground water is also controlled by the <br />structure of the confined aquifer. In the ground water basin <br />_ formed by the Johnny Moore Syncline, flow is from the recharge area <br />779-31 as <br />