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of flow measured at each spring is presented in a subsequent section of this tab (Spring • <br />Flow). <br />Aquifer Characteristics. In 1987 and 1988, a total of 14 aquifer tests were conducted at <br />the Seneca II-Y Mine on monitoring wells completed in the eLtuvium, Wedge coal end <br />overburden, and Wolf Creek coal unite, and the Trout Creek sandstone aquifer. In 1990, <br />1992, end 1993, 26 additional aquifer tests were conducted on or near the Yoast leasehold <br />on monitoring wells completed (n the alluvium, Lennox coal end overburden, Yadga coal, <br />overburden, end underburden, end the Yo Lf Creek coal units. <br />Aquifer testing conducted in 1987 to 1988 consisted of constant discharge tests, slug <br />tests, and bailer tests (see Teb 7 of the Seneca II-Y PAP, 1989). testing conducted in <br />1990 [0 1993 consisted of variable discharge pumping tests (Aron end Scatt, 1965), end <br />slug tests (Cooper et el., 1967). Constant discharge end slug techniques involve matching <br />graphs of drawdown/recovery data against theoretical type curves. Bailer tests require <br />the use of analytical solutions to determine aquifer characteristics. The variable <br />discharge technique involves graphical treatment of specific drawdown (change in head with <br />respect to change in discharge over time) versus time. <br />The results of aquifer testing at Yoast are presented in Appendix 7-3 and summarized in <br />Table 7-9. Stati sticel summaries for the alluvium, Yadga coal, overburden, and <br />underburden, and Yolf Creek coal are given in Table 7-10. Data collected et the Seneca II <br />end II-Y Mines, as well es relevant date derived from regional geohydrologic studies of <br />the area (Stewart, 1983; Robson and Stewart, 1990) ere compared with recent date collected <br />from Toast wells, and ere included in Table 7-11. <br />In general, ground water occurs under unconfined conditions only within the alluvium. The <br />remaining units tested are confined, except in outcrop areas. Test results for the four <br />Lennox wells, Yedge overburden Yetl TOV1 and Yadga coal Yell YY2 ere presented only for <br />completeness. ]t is presumed [hat the annular seals have failed et the four Lennox wells, <br />as indicated by the presence of flowing water around the well casing at the ground <br />surface. The transmissivities end storativities at the two Yadga wells are quite <br />unrepresentative of bedrock wells. High transmissivities are not likely to be due to <br />fractured bedrock since well failures (i.e., Leaky seals) have been observed at all six <br />wells. • <br />Alluvial Yells. Transmissivity values of 0.53 to 171 ft2/day (9.1 ft2/day geometric mean) <br />30 <br />