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State Req. <br />Seasonal fluctuations in ground water levels are evident from <br />examining data in Appendix 7-2. For the most part, water <br />levels are lowest in the spring before snowmelt and highest in <br />the late summer and early fall. The degree to which ground <br />water levels will fluctuate is determined by the amount and <br />rate of recharge and discharge, and to a lesser extent by <br />factors such as barometric efficienty. In general, water level <br />changes at the Seneca Mine are gradual and rarely fluctuate <br />more than a few feet per year. <br />Three additional wells will be drilled in 1981 to define the <br />poteritiometric surface in the southern part of the permit. The <br />location of these wells is shown on Exhibit 7-2. <br />iii. Aquifer Test Analyses <br />Ten aquifer tests have been conducted using monitoring wells <br />completed in the alluvial, spoils, and lv'adge Coal aquifers at • <br />the Seneca II Mine. Constant discharge tests (Theis, 1935; <br />Cooper and Jacob, 1946; Neuman, 1975), slug tests (Cedergren, <br />1967; Cooper et al., 1967), and bailer tests (Skibitzke, 1958) <br />were used to determine aquifer physical characteristics. <br />A summary of aquifer test results is presented in Table 7-14a; <br />specific test data for all aquifer tests conducted at the <br />Seneca II Mine can be found in Appendix 7-9. Although no <br />site-specific pumping test data is available for the Wolf Creek <br />Coal, Wadge Overburden, and Trout Creek sandstone aquifers, <br />aquifer tests have been performed on these strata at the nearby <br />Seneca II-W Mine. The results of aquifer Cesting by Peabody at <br />the Seneca !I-W Mine are shown in Table 7-14 b. a swrunary of <br />aquifer test data from other area coal mines is presented in <br />Table 7-15. <br />Ground water occurs under unconfined conditions in the alluvial <br />and spoils aquifers. The remaining aquifers are unconfined <br />7-46 Revises 04/30/90 <br />