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• Water-level elevations were monitored with continuous <br />recorders in wells CoyB and GC3A to define the fluctuations in the <br />Flume alluvial ground-water system. Figure 2.7-43 shows that water <br />levels were gradually declining in May, June and July of 1986. <br />These increases in depth to water were occurring because of the <br />decrease in rechazge during this period of time and the use of <br />water by evapotranspiration. The daily variations in the Summer of <br />1986 were normally only a few hundredths, which could likely be due <br />to the natural variations because of daily barometric pressure <br />changes. A small amount of daily fluctuatior- could possibly be <br />attributed to evapotranspiration but is relatively small if it <br />occurred. <br />Section 2.7.5.1a of the Trapper Mine permit presents the <br />• aquifer characteristics for this area. Pump tests were conducted <br />on the Coy alluvial well using observation well CoyA. This pump <br />test produced a transmissivity of 950 gal/day/foot and a <br />permeability of 2.4 ft/day. A multi-well pump test was also <br />conducted at the GC3 Flume alluvial site. Transmissivity at this <br />alluvial site for the pumping well was 520 gal/day/foot. This data <br />indicates a permeability 1.1 ft/day. A transmissivity of 950 <br />gal/day/foot, a gradient of 0.1 and a width of 400 feet indicate <br />that 26 gpm of ground water were flowing in the Flume alluvium at <br />the Coy site in 1986. d flow rate of approximately 8 gpm is <br />thought to be representative of the amount or ground water moving <br />at the Coy site in 1992. <br />• <br />.'~T:.~v <br />t.~'._'. <br />~~ ~'_. -- .YM' <br />Afl15® ll/83/92 <br />li! i~ ~. .'.1`. <br />