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To keep the Mine <br />pumping water from the lower levels of the Mine, collecting that water at the 19 <br />level, pumping it to the <br />was discharged into Ralston Creek. R:00032, 00043. During dewatering, the <br />water level near the Mine was drawn down to 2,200 feet below the Steve level. <br />R:00263. Cotter maintained a water treatment system at the site from 1972 to <br />June 2002. R:00031 -32. <br />dry during operations, Cotter dewatered the Mine by <br />7 level, then to the surface where it was treated before it <br />Once Cotter extracted all of the uranium it wanted <br />from the Mine, Cotter allowed the Mine to flood in 2000. R:00044. <br />Cotter shut down the water treatment system in June 2002. R:00057, <br />00122. Cotter terminated sump recirculation at the site in April 2008. R:00058, <br />n. 6; 00122, 00203. Subsequent semiannual monitoring and effluent reports <br />show increased levels of uranium at the Ralston Creek BPL (below property line) <br />monitoring station, located at the edge of the site downstream from the alluvial <br />fill area. R:00875. In- stream water quality standards published by the Water <br />Quality Control Commis ion within the Colorado Department of Public Health <br />and Environment limits the amount of uranium in this area of Ralston Creek at <br />0.03 mg /L. R:00096; 5 C.C.R. §§ 1002 -31 and 1002- 38(3)(d). The levels of <br />uranium in Ralston Creek have exceeded this limit since water treatment and <br />R:00145 -146, 00221, 00225 In its EPP, Cotter acknowledges that the level of the mine <br />pool may be affected by precipitation. R:00071, 00077, 00145 -146; see also R:00214 <br />(precipitation ranged from 14.96 to 22.23 inches during 68% of all years). <br />8 The published standard is 30 pg /L, which equals .03 mg/L. <br />17 <br />