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selenium, silver, and zinc). Water quality measurements for upper Theresa Gulch show <br />calcium as the dominant cation and bicarbonate as the dominant anion. The two lower <br />stations in Theresa Gulch show calcium sulfate water as does WCSW. Water quality <br />varies from T -1 to WCSW. Median pH levels at T -1 are 7.59, 7.15 at T -2, 7.19 T t -3 and <br />8.09 at WCSW. Median nitrate levels are <0.05 milligrams/Liter -N ( "mg/L ") at T -1, <br />2.97 mg/L -N at T -2, 1.73 mg/L -N at T -3 and 2.17 mg/L -N at WCSW. Median sulfate <br />levels are 20 mg/L atT -1, 300 mg/L at T -2, 441 mg/L at T -3 and 156 mg/L at WCSW. <br />The Bateman Creek station shows calcium as the dominant cation, and bicarbonate as the <br />dominant anion with a median pH level of 7.55, median nitrate of 0.07 mg/L -N and <br />median sulfate of 45.1 mg/L. The Wilson Creek station below the confluence with <br />Bateman Creek reflects a calcium bicarbonate matrix with a median pH level of 7.98, <br />median nitrate level of 3.37 mg/L -N and median sulfate level of 140 mg/L. <br />Arequa Gulch <br />Arequa Gulch is a west - draining tributary of Cripple Creek on the southwest corner of the <br />permit area. Arequa Gulch flows in response to precipitation events and is classified as <br />an ephemeral stream. CC &V has three monitoring stations on Arequa Gulch: two of <br />which have been actively monitored since mid -1985 (AG -1.0 and AG -1.5) and the other <br />of which has been monitored since mid -1990 (AG -2.0). Flow in Arequa Gulch also is <br />primarily in response to precipitation events. AG -2.0 has had only one recorded flow <br />event during the monitoring period (in 2003). <br />Arequa Gulch is classified as usable for recreation (Class N), agriculture, and as a Class 2 <br />cold water aquatic stream. Standards exist for pH, dissolved oxygen, E. Coli, minor <br />anions including chlorine, , and cyanide, nutrients of ammonia, nitrites and sulfide, as <br />well as the trace metals (aluminum, arsenic, boron, cadium, chromium, copper, iron, lead, <br />manganese, mercury, nickel, selenium, silver, and zinc). Water quality measurements for <br />the Arequa Gulch stations have been compiled and are presented in Appendix 2, Volume <br />II of this document. The water in Arequa Gulch has a calcium sulfate character, but <br />variable chemistry from upstream to downstream. Flows from historic mine features may <br />have influenced the pH, sulfate concentrations, and nitrate values. Arequa Gulch has <br />median pH levels of 4.3 at AG -1.0 and 6.06 at AG -1.5, median nitrate levels of 16 mg/L- <br />N at AG -1.0 and 14.2 mg/L -N at AG -1.5 and median sulfate levels of 710.5 mg /L at AG- <br />1.0 and 666 mg/L at AG -1.5. There is not quality data for AG -2.0 due to the lack of flow <br />at this station. Additional discussion of the flow and water quality conditions in Arequa <br />Gulch is presented in Appendix 2, Volume II. <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension 2 <br />4 -10 <br />