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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 1986 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 Chia well. <br />Water levels for well GC-2 for 1986 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 Culch 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 /> Well P-s is used to monitor the Second White Sandstone. The Second White <br /> Sandstone is shallow ne ar well P-5 and therefore, in the recharge zone of this <br />• aquifer. Water-level elevation data plotted on Figure 2.7-29m shows Che <br />z-sz3 ~ REy~SED FEB 13 'S7 <br />