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<br />MINREC, INC. ANNUAL HYDROLOGIC REPORT PAGE 5 <br />presented in a table in Appendix Iv. The quality of the discharge <br />from the mine shows little change from prior years except the <br />' conductivity, total dissolved solids and iron in the mine discharge <br />has continued to decrease each year. The treatment provided by the <br />algae and cattails in the long pond is believed to contribute to <br />' the improved quality of the mine discharge. <br />' The following table presents arithmetic averages of flow and <br />quality measurements taken at the outfall of the No. 1 Mine <br />discharge. <br /> <br /> <br />1 <br /> <br /> <br />1 <br />1 <br />LJ <br />LJ <br /> <br /> <br /> <br />NO. 1 MINE QUALITY <br />YEAR FLOW pH COND TDS IRON <br />1989 16.5 7.9 3598 2512 1.51 <br />1990 17.0 8.1 3157 2129 1.16 <br />1991 20.1 8.1 2890 2018 1.28 <br />1992 19.3 8.0 2722 1805 0.72 <br />1993 22.4 7.9 2643 1738 0.54 <br />1994 21.2 7.6 2627 1710 0.52 <br />1995 31.7 7.8 2487 1680 0.17 <br />The 1994 data is for the period January through March 1994. The <br />1995 data is for the period January through November. <br />The units for the figures in the above table are; flow (gpm), pH <br />(standard units); conductivity (umhos/cm); total dissolved solids <br />(mg/1) and iron (mg/1). Iron was measured as total recoverable <br />until April 1994 when the Colorado Department of Public Health and <br />Environment changed the discharge permit to require iron to be <br />measured as potentially dissolved. <br />ANTICIPATED IMPACT <br />Discharge from the No. 1 mine may slightly impact the quality of <br />water in North Thompson Creek. The mine water discharge has a low <br />iron content and an acceptable pH, however its conductivity is <br />quite high. A 30 gpm flow with a conductivity of 2487 discharging <br />into a receiving stream with a 5 cfs flow and a conductivity of 130 <br /> <br />