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7-3), There is no trend concerning seasonal mean water levels. The shallowest mean water • <br />levels for the four Wolf Creek coal wells analyzed (2WC, 3WC, 4WC, and 17WC) occur in all <br />four seasons of the year. Vi suzl examination of the Wolf Creek coal water level <br />hydrographs (Appendix 7-2) indicates that the greatest response to recharge occurs in the <br />spring and summer, suggesting that; both snowmelt and rainfall are important forms of <br />recharge. The deepest seasonal mean water levels occur in the fall and spring. <br />A pattern does tend to emerge concerning amounts of seasonal water level fluctuation. The <br />least amount of fluctuation typically occurs in the fall and ranges from 2,5 feet at Well <br />17WC to 25.2 feet at Well 4WC. The greatest amount of fluctuation occurs in the spring <br />and summer seasons at Wells 3WC, 4W'C, and 17WC, and ranges from 5.1 feet at Well 17WC to <br />35.4 feet at Well 347C. Regardless of the season, the greater water level fluctuations <br />occur at the wells that are located closer to the crop. The total range of fluctuation in <br />Wells 3WC and 4WC (closest to the crop) is four to eight times greater than the range of <br />fluctuation in Wells 2WC and 77WC (furthest from the crop). <br />Trout Creek Sandstone Water Levels. Two wells (GW-52W-200TC and CW-s2W-201TC) were <br />completed in the Trout Creek Sandstone aquifer in November, 1988. Well 201TC will be used • <br />as the production well for the Seneca II-W Mine and Well 200TC will be monitored to <br />evaluate the performance of the sandstone aquifer and to measure long term drawdowns in <br />the aquifer resulting from pumpage to supply mine water needs. The location of Wells <br />200TC and 201TC is shown on Exhibit 7-1. <br />Water level readings were taken during a short term aquifer test performed in December, <br />1988. The pre-pumpage reading indicated the aquifer is flowing artesian with a head of <br />approximately 30 feet above ground surface. The well flowed at approximately 5 gpm prior <br />to capping. <br />Potentiometric Surfaces. Potenti ometric surface contour maps for the alluvium, Wa dge <br />overburden, Wadge coal, and Wolf Crcek coal are presented on Exhibits 7-2 through 7-4, <br />The water table surfaces for the alluvial aquifers are presented on Exhibit 7-2. The <br />water table elevations used on the exhibit are the arithmetic mean of the values for the <br />period of record that are believed valid. The distribution of the alluvial wells is such <br />that construction of uniform contours between wells on Exhibit 7-2 cannot be done with any • <br />high degree of confidence. Thus, only the water table elevations at each well location <br />18 <br />