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Third White Sandstone <br />Three wells in the pre -mining area monitor the Third White Sandstone aquifer. <br />Figures 2.7-29j, 2.7-29k and 2.7-291 present hydrographs for wells GP -9, GC -2 and <br />P-8, respectively. <br />Water -level elevations have remained fairly consistent during 1985 and 1986. <br />Water levels in the Third White Sandstone have gradually risen during the last year <br />at well GP -9. The initial water level is thought to have been affected by the <br />drilling of this well. <br />Water levels for well GC -2 for 1985 and 1986 are slightly higher than previous <br />data. Water levels have naturally varied nearly ten feet at well GC -2. Water <br />• levels have varied greatly in the Third White Sandstone at well P-8. Water levels <br />rose greatly in 1984 in this aquifer and have since shown a gradual decline after <br />spring runoff each year. The baseflow in Pyeatt Gulch also greatly varied in 1984. <br />Map M54C presents the piezometric surface of the Third White Sandstone <br />aquifer. The water -level elevation map was developed from September, 1986 water - <br />level data. The hydraulic gradient between wells GC -2 and GP -9 is 0.09 ft/ft and is <br />thought to be similar near well P-8. <br />Second White -Sandstone <br />2-523 v REyISED FEB 13 '87 <br />Well <br />P-5 is used <br />to monitor the Second White <br />Sandstone. The Second <br />White <br />Sandstone <br />is shallow near <br />well P-5 and therefore, <br />in the recharge zone of <br />this <br />• <br />aquifer. <br />Water -level <br />elevation data plotted on Figure 2.7-29m shows <br />the <br />2-523 v REyISED FEB 13 '87 <br />