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III IIIIIIIIIIIIIIII Doc Date:12/11/2001 2.0 GROUND-WATER LEVELS Water levels or water pressure have been measured in 39 wells at Trapper Mine. Wells GD-2, GF-1, GF-3, GP-3, GP-4, and well 81-03a are flowing wells and pressure readings on these wells have been converted to static water head in feet above land surface. Well GD-1 (2) is not measured for water level because a pump is installed in this well. Monitoring wells GD-3, GF-11, and GLUX-1 were installed in 1988 and well GMP-1 was installed in 1990. Well GA-2 went dry between the second and third quarters of 1994 and remained dry throughout 1995 and 1996. The locations of these monitoring wells are shown on enclosed Maps No. 2-1 through 2-3. Wells GD-1(2) and GF-1 are completed in the Twenty Mile Sandstone, while well GF-2 is completed below the R coal in the U aquifer system. Seven wells, GA-1, GE-1, GD-2, GF-6, GP-1, GP-5, and GP-6 are used to monitor the OR aquifer. Wells GD-3 and GF-i i are completed in backfill derived from the OR aquifer and, therefore, are also used to monitor the QR aquifer. Wells GA-2, GB-1, GF-3, GP-2, GP-4, and GP-8 are used to monitor the KLM aquifer. Seven wells, GB-5, GC-1, GE-2, GF-4, GP-3, GP-7, and GMP-1 are used to observe changes in the HI aquifer. Wells GF-5 and GF-7 are completed in backfill material derived from the HI aquifer and are also used to monitor the HI aquifer. Wells GB-2, GC-2, GE-3, P-8, 81-03A, and GP-9 are used to monitor the 3rd White Sandstone aquifer. Well GE-3 is completed in both the 2nd and 3rd white sandstone and well P-5 are completed in the 2nd White Sandstone between the G and F coals, while GLUX-1 is used to monitor the 1st White Sandstone. Well P-3 is perforated in the Lewis Shale. Four alluvial wells, GC-3, P-1, J-1, and COY are used to monitor the Flume, Pyeatt, and Johnson alluviums. Wells GA-1 (OR aquifer) and GA-2 (KLM aquifer) were removed 2-1