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5.2.2 Mine Life Extension 2 <br />MLE2 proposes to construct a 220 million ton SGVLF in the middle reaches of Squaw <br />Gulch. The SGVLF will cover approximately 348 acres with impermeable liner. The <br />SGVLF will overlie and abut the SGOSA on its northeast (upgradient) side. The <br />downstream extent of the SGVLF will be a toe berm constructed across the valley. The <br />toe berm will include the realigned SH 67. The disturbance limits and the proposed <br />layout of the SGVLF are shown on Figure 2 -2. <br />As noted on Figure 2 -2, SGMW -3A, SGMW -3B, SG- 04 -PZ, SG -05, and SG -07 will be <br />lost to the SGVLF development. <br />5.2.3 Surface Water <br />5.2.3.1 Monitoring Program <br />Surface water conditions in Squaw Gulch are assessed at three locations between the <br />EMPs below the SGOSA and the confluence of the Squaw Gulch and Cripple Creek, <br />designated as SG -05, SG -07, and SG -10. Monitor locations are shown on Figure 2 -2. <br />SG -05 is located within the Diatreme. SG -07 and SG -10 are located over the granites <br />adjacent to the Diatreme. <br />Field parameters and water quality samples are collected quarterly at SG -05, SG -07, and <br />SG -10 and analyzed for the parameters listed in Table 3 -1. <br />5.2.3.2 Data <br />The period of record and compiled field measurements and water quality data (number of <br />measurements, less than detection events, maximum value, minimum value, average <br />value, standard deviation, and median value) for the sample stations SG -05, SG -07, and <br />SG -10 are provided in Tables 5 -2, 5 -3, and 5 -4, respectively. Time series plots of <br />selected parameters (flow and pH, nitrate, and sulfate) are provided in Figures 5 -2 and 5- <br />3, respectively. <br />5.2.3.3 Discussion <br />Surface water flows in Squaw Gulch are seasonal and generally low (0 to 164 gpm). <br />Flow, when it occurs, is typically in the 2 quarter due to snowmelt and runoff. <br />Occasional late 3 and early 4 quarter flows due to seasonal rains also are observed. <br />Flow data for SG -05, SG -07, and SG -10 are shown in Figure 5 -2. Flow rates (when <br />'Cripple Creek & Victor Gold Mining Company <br />Cresson Project Hydrologic Evaluation for Mine Life Extension 2 <br />16 <br />