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fluctuations in water level for well P-5 from January, 1982 to November, 1986. <br />Water -level elevations generally have fluctuated from 6437 to 6441 ft-msl. A <br />gradual decrease'in water levels each year after spring runoff is typical. Map M54C <br />also presents the water -level elevation 'contours for the Second'White Sandstone <br />aquifer for the third quarter of 1986. The gradient near well P-5 in the Second <br />White Sandstone is thought to be approximately 0.08 ft/ft. <br />Lewis Shale <br />Only well P-3 is used to monitor water -level fluctuations in the Lewis Shale. <br />Figure 2.7-29n presents the water -level elevation versus time data for well P-3. <br />Data from 1982 to early 1984 is fairly erratic probably. from large seasonal <br />fluctuations. Water -level data after February 1984 has remained virtually <br />• unchanged.- The water -level elevation in the Lewis Shale near well P-3 has been <br />approximately 6362 ft-msl for the last year. <br />Alluvial Aquifer <br />Wells .GC -3, .and COY are completed.. in .the . Flume, alluvium, while well P-1 is <br />completed in the Pyeatt alluvial aquifer in.the pre -mining area. Figures 2.7-29o, <br />2.7-29p and 2.7-29q present water -level elevation versus time for wells P-1, GC -3 <br />and COY, respectively. Each of the wells exhibits some definite changes in water <br />level. Th+s is not__uncommon in alluvial aquifers as they are readily influenced by <br />surface runoff and precipitation. <br />Well .P-1 exhibits consistent water levels from late 1984 to November 1986. <br />2-523w REVISED FEB 13 '87 <br />