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extensive workings are on the 19 level, with significant development on the 7, 9, <br />15, 16 and 17 levels. R:00032. Total mine depth is 2222 feet below the Steve <br />level portal to the bottom of the spiral decline. R:00032, 00942. <br />According to the U <br />R:00046, 00867. Ralston <br />downstream of the Mine. <br />the Mine. R:00228, 0087 <br />.S. Geological Survey, the Mine was the largest and <br />most productive uranium mine in Colorado. R:00866. Total production was <br />about seventeen million pounds of uranium. R:00866. <br />Three surface water features lie within two miles of the Mine: Ralston <br />Creek, Ralston Reservoir, and Long Lake Ditch. R:00049. The Mine is situated <br />adjacent to Ralston Creek, only three hundred feet from the creek. Table 8 -1 at <br />Creek is a perennial stream that flows into Ralston <br />Reservoir, located 1.6 miles downstream from the Mine. R:00035 -36, Table 8 -1 <br />at R:00046; 00097, n. 27 at 00203, 00867, 00924 -925. Ralston Reservoir supplies <br />drinking water to Denver, Arvada and others. R:00050, 00867. Long Lake Ditch <br />is an irrigation canal th t supplies water to Upper Long Lake and Lower Long <br />Lake, with a diversion h adgate located on Ralston Creek about 1.5 miles <br />R:00051. <br />Concentration of uranium in ground water monitoring wells increases <br />nearly 400 times from wells upgradient from the Mine to wells downgradient of <br />4, 00877- 00881. Ralston Creek is essentially devoid of <br />5 A spiral decline was developed from the 19 level to the 22 level from 1988 to 1996. <br />R:00031. <br />14 <br />