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Field parameters and water quality samples are collected quarterly at T -2 and WCSW -01, <br />and analyzed for the parameters listed in Table 3 -1. Field parameters and water quality <br />samples also are collected quarterly for BCSW and WCSW and analyzed for the <br />parameters listed in Table 3 -1. Field parameters and water quality samples also are <br />collected semi - annually and annually for T -3 and T -1, respectively, and analyzed for the <br />parameters listed in Table 3 -1. <br />4.1.3.2 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 T -1, T -2, T -3, <br />WCSW, BCSW, and WCSW -01 are provided in Tables 4 -1, 4 -2, 4 -3, 4 -4, 4 -5, and 4 - -6 <br />respectively. Time series plots of selected parameters (flow and pH, nitrate, and sulfate) <br />are provided in Figures 4 -1 and 4 -2, respectively. <br />4.1.3.3 Discussion <br />North Fork of Wilson Creek <br />Surface water flows in the North Fork of Wilson Creek (Theresa Gulch) are seasonal and <br />generally low. Flow, when it occurs, is typically in the 2 quarter due to snowmelt and <br />runoff. Occasional 3 and 4 quarter flows due to seasonal rains also are observed. <br />Median measured (non -zero) flows are 9, 17, and 22 gpm for T -1, T -2, and T -3, <br />respectively. Flow data are shown in Figure 4 -1. Flow rates (when reported for the same <br />day) increase, in most cases, in a downstream direction (T -1 to T -2 to T -3). The median <br />(non -zero) flow increases between T -3 to WCSW from 22 gpm to 207 gpm, respectively. <br />Flows at WCSW are more evenly and seasonally represented due to discharges from the <br />City of Victor Wastewater Treatment Plant. <br />The surface waters in the North Fork of the Wilson Creek (T -1, T -2, and T -3 in Theresa <br />Gulch) are characterized as calcium- bicarbonate (T -1) or calcium- sulfate (T -2 and T -3) <br />waters. Water quality data provided in Tables 4 -1, 4 -2, and 4 -3 show median field pH <br />values that are circum- neutral and stable at 7.59 standard units ( "SU ") at T -1, 7.15 SU at <br />T -2, and 7.19 SU at T -3. Median nitrate values increase from T -1 ( <0.05 mg/L as N) to <br />T -2 (2.97 mg/L as N) and then decrease to T -3 (1.73 mg/L as N). Median sulfate values <br />increase in the downstream direction from 20 mg/L at T -1, to 300 mg /L at T -2, and to <br />441 mg /L at T -3. Time series plots of selected parameters (pH, nitrate, and sulfate) are <br />provided in Figure 4 -2. The downgradient increase in sulfate is potentially attributable to <br />'Cripple Creek & Victor Gold Mining Company <br />Cresson Project Hydrologic Evaluation for Mine Life Extension 2 <br />5 <br />