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• <br />presented shows a low point in March 1986 and recovery to November 1986. <br />THIRD WHITE SANDSTONE AQUIFER <br />Two wells are used to monitor the Third White Sandstone. Figures 4.8-23 and <br />4.8-24 present water-level elevation hydrographs for wells GB2 and GBBI <br />respectively. <br />Well GB2 has exhibited a decrease in water level of approximately 6 feet from <br />mid-1982 to November 1986. Periods of constant water level have occurred throughout <br />this time. The declines in water-level are probably due to mining in the Ashmore <br />pit, but also could be natural variations. <br />• Figure 4.8-24 presents water levels for well GBB1. Static water levels have <br />been above land surface in the past except for periods of recovery after pumping in <br />1985. Well completion is thought to have affected water levels in well GBB1. <br />SECOND WHITE SANDSTONE AQUIFER <br />Wells GE-3 and GBB2 penetrate the Second White Sandstone aquifer between the G <br />and F coals in the operational mine area. Figure 4.8-25 and 4.8-26 present the <br />water-level elevation versus time hydrographs for wells GE-3 and GBB2. <br />Water-level elevations for well GE-3 show a decrease of seventy feet over a <br />five to six month period (Figure 4.8-25). Levels remained fairly consistent through <br />1978 to 1984 when a recovery trend was apparent. The radical water-level change is <br />thought to be caused by effects of local underground mining. Well GBB2 has shown <br />4-226 y <br />REVISED FF8 13 '87