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reported for the same day) increase from SG -05 to SG -07 and decrease from SG -07 to <br />SG -10. <br />The surface waters in Squaw Gulch are characterized as calcium- sulfate waters. Water <br />quality data show that median field pH values increased from 4.15 SU at SG -05 to 4.63 <br />SU at SG -07 and 6.10 SU at SG -10. Median nitrate values ranged from 3.93 to 2.92 to <br />3.06 (mg/L as N) at SG -05, SG -07, and SG -10, respectively. Median sulfate values are <br />elevated and increase from 247 mg/L at SG -05, to 754 mg/L at SG -07, and then decrease <br />to 615.5 mg/L at SG -10. Time series plots for pH, nitrate, and sulfate are shown in <br />Figure 5 -3. Water quality data are provided in Tables 5 -2, 5 -3, and 5 -4. <br />Compiled data and statistics for other aluminum, manganese, and zinc, which are <br />common geochemical indicators in the Diatreme, are provided in Tables 5 -2, 5 -3, and 5- <br />4. The water quality data indicate elevated but relatively stable concentrations for <br />aluminum, manganese, and zinc for the individual stations SG -05, SG -07, and SG -10 <br />since 1998, 2007, and 1998, respectively. Aluminum, manganese, and zinc <br />concentrations increase from SG -05 to SG -07 and decrease from SG -07 to SG -10. Other <br />trace metals are analyzed as part of the monitoring program. Median values for arsenic, <br />chromium, lead, mercury, selenium, and silver in the surface waters at SG -05, SG -07, <br />and SG -10 were less than the analytical detection limits. Median concentrations of <br />cadmium, copper, and nickel were above the analytical detection limits, but low at SG- <br />05, SG -07 (except copper), and SG -10 (except cadmium and copper). Trace metal data <br />also are provided in Tables 5 -2, 5 -3, and 5 -4. <br />5.2.3.4 MLE2 Impacts to Surface Waters <br />The SGVLF construction and operation in the middle reaches of the Squaw Gulch <br />drainage (Figure 2 -2) will cover approximately 346 acres with impermeable liner. The <br />SGVLF will capture precipitation and is therefore likely to reduce surface runoff and <br />flows in lower reaches of the Squaw Gulch drainage. Periodic flow at SG -10 is expected <br />to continue due to snow melt and runoff in the spring and from precipitation and runoff in <br />the summer and fall in the lower reaches of the Squaw Gulch drainage; however the <br />quantity of water is expected to be reduced. Based on the water composition for SG -05, <br />SG -07, and SG -10, the water quality constituent concentrations at SG -10 after the <br />construction of the SGVLF are expected to be similar to the current conditions. The <br />removal of historic mine features and other materials during construction of the SGVLF <br />'Cripple Creek & Victor Gold Mining Company <br />Cresson Project Hydrologic Evaluation for Mine Life Extension 2 <br />17 <br />