Laserfiche WebLink
GROUNDWATER MONITORING <br />Bedrock <br />Three sandstone aquifers are monitored at the site. They are, in ascending order: <br />Trout Creek Sandstone (2 wells), Middle Sandstone (6 wells), and Twentymile <br />Sandstone (3 wells). The #5 and #6 Mines are between the Trout Creek Sandstone <br />and the Middle Sandstone. <br />WATER LEVELS <br />The potentiometric levels, represented by water levels in the two Trout Creek <br />Sandstone wells (Fig. 3), recovered to the levels measured in 1986 through 1988. <br />The recovery of the two wells is apparently from reduction in pumping for use since <br />both wells are used for water supply as well as monitoring. The 1994 levels in both <br />the No. 5 Mine Well and the Okie Plaza Well appear to be 45 to 70 feet lower than the <br />levels measured when monitoring was initiated in 1985 and 1987, respectively. Water <br />level fluctuations of 20 to 200 feet are also observed but no seasonal pattern is <br />evident or expected. The Okie Plaza well was abandoned in June 1994 as mining <br />advanced through its locations. <br />The water levels in the Middle Sandstone (Figs. 4 to 9) show fluctuations which are <br />apparently related to dewatering and subsidence associated with Mines 5 and 6. The <br />C-81-044 1994 AHR Page 2 <br />