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<br />GROUNDWATER MONITORING <br />BEDROCK <br />Three sandstone aquifers are monitored at the site. They are, in ascending order: Trout <br />Creek Sandstone (2 wells), Middle Sandstone (6 wells), and Twentymile Sandstone (3 <br />wells). The #5 and #& Mines are between the Trout Creek Sandstone and the Middle <br />Sandstone. <br />WATER LEVELS <br />The potentiometric levels, represented by water levels in the two Trout Creek Sandstone <br />wells, recovered to the levels measured in 1986 through 1988. The recovery of the two <br />wells is apparently from reduction in pumping for use since both wells are used for water <br />• supply as well as monitoring. The 1994 levels in both the No. 5 Mine Well and the Okie <br />Plaza Well appear to be 45 to 70 feet lower than the levels measured when monitoring <br />was initiated in 1985 and 1987, respectively. Water level fluctuations of 20 to 200 feet are <br />also observed but no seasonal pattern is evident or expected. The Okie Plaza well was <br />abandoned in June 1994 as mining advanced through its location. The water levels in the <br />Middle Sandstone show fluctuations that are apparently related to dewatering and <br />subsidence associated with Mines 5 and 6. The declines in the levels in Wells 81-01 and <br />83-01 between 1988 and 1990 appear to have leveled off since the middle of 1990, and <br />appear to be recovering with significant level increases in 1994. Water levels in these two <br />wells and in Well TR-7A measured during 1994 are similar to the levels measured in the <br />G <br /> <br />