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5.4.3 Surface Water <br />5.4.3.1 Monitoring Program <br />Surface water conditions in Arequa Gulch are assessed at three locations between the <br />AGVLF and the confluence of the Arequa Gulch and Cripple Creek. The sample station <br />designations are: AG -1.0, AG -1.5, and AG -2.0. Sample stations are shown on Figure 2- <br />2. The surface stations are located over the granites that are adjacent to the Diatreme. <br />Field parameters and water quality samples are collected quarterly at AG -1.0, AG -1.5, <br />and AG -2.0 and analyzed for the parameters listed in Table 3 -1. <br />5.4.3.2 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 AG -1.0, AG -1.5, and <br />AG -2.0 are provided in Tables 5 -12, 5 -13, and 5 -14. Time series plots of selected <br />parameters (flow and pH, nitrate, and sulfate) are provided in Figures 5 -8 and 5 -9. <br />Minimal water quality data have been collected from AG -2.0, due to dry conditions. <br />5.4.3.3 Discussion <br />Flow at AG -1.0 is nearly continuous, but low. Surface water flows at AG -1.5 are <br />seasonal and variable (0 to 700 gpm). Flow at AG -1.5, when it occurs, is most frequently <br />in May through October due to snowmelt and runoff and seasonal rains. There has been <br />only one recorded flow at AG 2.0 and that was in 2003. Median measured (non -zero) <br />flow is 0.63 gpm and 12.8 gpm for AG 1.0 and AG 1.5, respectively. Flow data for AG- <br />1.0, AG -1.5, and AG -2.0 are shown in Figure 5 -8. No surface flow has been recorded in <br />Arequa Gulch at AG -1.5 or AG -2.0 since mid -2003. <br />The surface waters in Arequa Gulch are characterized as calcium- sulfate waters. Water <br />quality data show the median field pH value is 4.3 SU at AG -1.0 and 6.06 SU at AG -1.5. <br />Median nitrate values were 16 and 14.2 mg /L as N at AG -1.0 and AG -1.5, respectively. <br />Median sulfate values were 710.5 and 666 mg /L at AG -1.0 and AG -1.5, respectively. <br />Time series plots for pH, nitrate, and sulfate are shown in Figure 5 -9. Water quality data <br />are provided in Tables 5 -12, 5 -13, and 5 -14. <br />Compiled data and statistics for aluminum, manganese, and zinc, which are elevated in <br />the district background, are provided in Tables 5 -12 and 5 -13. The water quality data for <br />'Cripple Creek & Victor Gold Mining Company <br />Cresson Project Hydrologic Evaluation for Mine Life Extension 2 <br />24 <br />