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EASTERN MINING DISTRICT <br />CYCC Site 8 is located approximately 2.5 miles downstream of the U.S.G.S. Station 09243800. Flow was <br />monitored under the previous permit, and is currently being monitored only when water quality samples are <br />collected. <br />Foidel Creek at Mouth (U.S.G.S. Station 09243900) is located 0.85 miles upstream of the confluence of Foidel <br />Creek with Middle Creek. The station has been operating since 1975 with a period of record from October 1975 <br />through September 1981 and June 1982 through 1992. Table lOB shows a summary of flows from 1976 to present. <br />the mean annual flow for this station ranged from 0.07 cfs in water year 1977 to 4.39 cfs in water year 1981. <br />Middle Creek <br />Stream flow is monitored on Middle Creek by U.S.G.S. Station 09243700 and is located 1.25 miles upstream of the <br />confluence with Foidel Creek. The period of record far the Middle Creek station is from October 1975 through <br />September 1981 and April 1982 through the current year. Mean annual flow ranged from 0.5 cfs in 1977 to 7.22 <br />cfs in 1980. <br />Surface Water Quality <br />Farming and irrigation, road drainage, and previous mining affect baseline surface water quality above and below <br />the mine. Concentrations of major and trace constituents vary greatly with the rates of flow, evaporation, and the <br />location of sampling. A complete description of the baseline water quality prior to mining is found in Section 2.04 <br />of the previous permit. <br />Results of the analyses for surface water quality samples taken during April and May of 1993 for Upper Foidel <br />Creek neaz Oak Creek (Station No. 14) are found in Table IOD, Water Quality Foidel Creek Near Oak Creek, <br />Station No. ]4. Additional results of analyses for Upper Foidel Creek near Oak Creek, Foidel Creek at CYCC Site <br />8, and Middle Creek at U.S.G.S. Station 09243700 for 1992 are found in Tables 10E, IOF, and IOG, respectively. <br />Fluctuations in some surface water quality parameters are directly related to variations in Flow rates. As stream <br />flows increase, concentrations of suspended constituents, such as total suspended solids or total iron, increase. <br />Increases in stream flow tend to decrease the concentrations of dissolved constituents because of dilution. <br />Water quality in Upper Foidel Creek, as measured in 1993, is shown on Table IOD. Total dissolved solids ranged <br />from 226 mg/I in April 1993 to 606 mg/I in May 1993. Field pH ranged from 8.2 units in April 1993 to 8.6 units in <br />May 1993. Concentrations of total recoverable iron ranged from 0.33 mg/1 in April 1993 to 1.21 mg/1 in May 1993. <br />Total recoverable manganese concentrations ranged from 0.01 mg/1 to less than 0.01 mg/I from April 1993 to May <br />1993, respectively. Total recoverable zinc concentrations ranged from below detection limit to 0.02 mg/I during <br />April 1993. Other metals analyzed were consistently below detection limit. <br />Water quality in CYCC Site 8 is of magnesium-calcium sulfate type. Total dissolved solids ranged from 1,890 <br />mg/I in April 1992 to 3,856 mg/I in September 1992. Field pH ranged from 8.3 units in April and June 1992 to 8.5 <br />units in August 1992. Concentrations of total recoverable iron ranged from 0.4 mg/I in August 1992 to 8.0 mg/I in <br />September 1992. Total recoverable manganese concentrations ranged from 0.1 mg/I in April 1992 to 2.3 mg/l in <br />June 1992. Total recoverable zinc concentrations ranged from below detection limit in Lune 1992 to 0.2 mg/1 in <br />August and September 1992. Other metals analyzed were consistently below detection limit. <br />• <br />Permit Renewal No. 3 2.04-37 12/10/98 <br />