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• of 6.2, average nitrate values of 9.4 mg/L, and average sulfate values of 740 <br />mg/L. <br />Gold Run <br />Three wells were used to summarize the water quality in the Gold Run watershed: <br />GRMW-2A and -3A are completed in the granite in the upper reaches of the <br />watershed and GRMW-IA is completed in the lower reaches of the watershed. <br />All wells were installed in mid-1998. Water levels vary by less than 10 feet. <br />Overall, the ground water in Gold Run is characterized by calcium-sulfate- <br />bicarbonate solutions with neutral pH, low nitrates and average sulfate values of <br />707 mg/L, 1,723 mg/L and 184 mg/L in GRMW-IA, GRMW-2A, and GRMW- <br />3A, respectively. <br />Squaw Gulch <br />Water quality was summarized for four wells and one shallow piezometer in <br />Squaw Gulch. The oldest well was installed in 1994 and the most recent well was <br />installed in 1998. The monitoring wells are designated SGMW-3A (diatreme), <br />SGMW-3B (alluvium/shallow diatreme), SGMW-5 (granite), and SGMW-6. The <br />• shallow piezometer is screened in the alluvium and is designated SG-04PZ. Five <br />monitoring wells have been plugged and abandoned in Squaw Gulch due to the <br />development and expansion of the SGOSA. Seasonal fluctuations of water levels <br />are seen in the piezometer and alluvial well. SGMW-5 and SGMW-6 have shown <br />dry conditions since they were installed. Ground water levels in SGMW-3A vary <br />from 141.7 to 150 feet bellow ground surface ("bgs"). <br />Overall, the ground water in Squaw Gulch is characterized as calcium-sulfate <br />dominated. Data show an average pH value of 4.9 in the alluvium (SG-04-PZ) <br />and an average pH value of 6.1 in the shallow bedrock (SGMW-3B). Nitrate <br />values average 3.7 mg/l in the alluvium and 0.96 mg/l in the shallow bedrock. <br />Sulfate values average 421 mg/1 in the alluvium and 701 mg/l in the shallow <br />bedrock. Deeper ground water quality data (SGMW-5 and SGMW-6) are absent <br />due to the dry conditions as a result of historic drainage of the diatreme. <br />Grassy Valley <br />There have been 42 wells monitored in the Grassy Creek Valley. Three <br />piezometers and five wells were drilled in 2007 to supplement the hydrogeologic <br />characterization of Grassy Valley. There are 18 wells and piezometers in Grassy <br />• <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />4-14