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(~ROIINDifATER ?[ONITORINO <br />• Hedroek <br />Three sandstone aquifers are monitored at the site. They are, <br />in ascending order: Trout Creek Sandstone (2 wells), Middle <br />Sandstone (6 wells), and Twentymile Sandstone (3 wells). The <br />#5 and #6 Mines are between the Trout Creek Sandstone and the <br />Middle Sandstone. <br />RATER LEVELB <br />The potentiometric levels, represented by water levels in the <br />two Trout Creek Sandstone wells, recovered to the levels <br />measured in 1986 through 1988. The recovery of the two wells <br />is apparently from reduction in pumping for use since both <br />wells are used for water supply as well as monitoring. The <br />• 1993 levels in both the No. 5 Mine Well and the Okie Plaza <br />Well appear to be 45 to 70 feet lower than the levels measured <br />when monitoring was initiated in 1985 and 1987, respectively. <br />Water level fluctuations of 20 to 200 feet are also observed <br />but no seasonal pattern is evident or expected. It is likely <br />that the fluctuations are related to pumping for use, as <br />evidenced by the 1993 data. The water levels in the Middle <br />Sandstone show fluctuations which are apparently related to <br />dewatering and subsidence associated with Mines 5 and 6. The <br />declines in the levels in Wells 81-01 and 83-01 between 1988 <br />and 1990 appear to have leveled off since the middle of 1990, <br />and appear to be recovering. Water levels in these two wells <br />• and in Well TR-7A measured during 1993 are similar to the <br />2 <br />