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RAG, Empire Corporation 1999 AHR <br />~~ Colorado Division of Minerals & Geology (DMG), as well as data collected to meet the <br />requirements of the Colorado Wastewater Discharge Permit System (CDPS permit). <br />Data contained in Figures 4, 5, 6, 10, and 21 reflect some different values then <br />reported in last years AHR. During overview of the historic data, some <br />inconsistencies were noted and corrected accordingly. Also, Wells TR-4 and 259 are <br />each missing a water level reading in 1999 due to a broken pressure gauge. These <br />discrepancies are reflected in figures 4 and 10 and in the Support Data tables. <br />GROUNDWATER MONITORING <br />• BEDROCK <br />Three sandstone aquifers are monitored at the site. They are, in ascending order: <br />Trout Creek Sandstone (1 well), 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 surface represented by water level measurements in the Trout <br />Creek Sandstone 5 Mine well (Fig. 3), has recovered to the levels measured in 1986 <br />through 1988. This recovery is apparently from a reduction in pumping for use by the <br />mining operation. The well is used for water supply as well as monitoring. Historical <br />Page 2 <br />