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to be monitored monthly. Water level measurements are taken with a Soil Test M-Scope, or <br />in the case of a few shallow alluvial wells, directly from a steel tape lowered in the <br />casing. Pressure readings for flowing wells are multiplied by a factor of 2.31 to obtain <br />head in feet. <br />1. Alluvium <br />The alluvial monitoring wells are located along Cressy Creek, Little Cressy Creek, and the <br />south tributary to Fish Creek (Cow Camp Creek). These wells exhibit seasonal fluctuations <br />in water level. The spring snowmelt runoff-infiltration stimulates a water level rise and <br />as the drier fall season approaches, water levels decline. The correlation between <br />streamflow and alluvial ground water levels is clearly evident in each of the drainages. <br />Generally, no significant changes in alluvial water levels were observed in 1986. Fall <br />water levels at wells CW-533, CW-534, CW-531, and CW-531-A2 were slightly tower due to <br />water being diverted from Little Cressy Creek (NPDES 001 pond), through the truck wash, <br />and into the NPDES 003 pond. This water diversion began September 18, 1984. Fall water <br />levels were also tower at well CW-S6A due to the removal of beaver dams on adjacent Little <br />Cressy Creek in the summer of 1984. _ <br />~• 2. Lennox Overburden, Lennox-Wedge Interburden, Wedge Overburden <br />Wells completed in these strata exhibit different trends in water levels and, therefore, <br />will be discussed individually. Well GW-S21 has shown little change in water level in <br />1986. This well is generally flowing except during late winter/early spring before runoff <br />recharge. Following a request from the CMLRD, a pressure gauge was installed on this well <br />in the spring of 1986 so that head measurements can be taken. Likewise, well CW-540-0 has <br />been flowing almost continuously since 1985, and was also fitted with a pressure gauge. <br />Wells CW-540-0 and CW-541-0 both showed expected drops in water level since the very <br />high runoff period in the spring of 1984. Well GW-544P2 was buried beneath spoil as <br />mining progressed in the winter of 1986. Its last observed water level (October 1985) <br />dropped over 50 feet in tyro months due to pit induced drawdowns. <br />A special situation exists at wells CW-542P1 (Lennox-Wadge Interburden) and CW-S42P2 <br />(Lennox Overburden) along with well CW-S42 (Wedge Coal). Water levels at all three wells <br />at this site have shown a shallowing trend (with some seasonal variability) since their <br />completion by the USCS in August 1981. Due to the water quality (especially high chloride <br />;~ concentration) and low recover noted at GW-S42 <br />y (see page 24 of the 1984 Annual Hydrology <br />Report), it is believed that this well, along with the other two wells at this site, have <br />11 <br />