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1 <br />' MINREC, ZNC. <br />ANNUAL HYDROLOGIC REPORT <br />' PAGE 5 <br />The units for the figures in the above table are; flow (qpm), pH <br />(standard units); conductivity (umhos/cm); total dissolved solids <br />(mg/1) and iron (mg/1). <br />' ANTICIPATED IMPACT <br /> Discharge from the No. 1 mine continues to slightly impact the <br />quality of water in North Thompson Creek. The mine water discharge <br />has a low iron content and an acceptable pH, however its <br />conductivity is quite high. A 22 gpm flow with a conductivity of <br />' 2653 discharging into a receiving stream with a 5 cfs flow and a <br />conductivity of 110 would increase the conductivity of the <br />receiving stream to about 135 which is considered insignificant. <br />The Colorado Department of Health has implemented new regulations <br />' regarding saline discharges into the Colorado River. A discharge <br />of one ton of salt per day can be considered a no-salt discharge by <br />the Department of Health. At the maximum expected flow rate of 40 <br />' gpm from the No. 1 Mine, the TDS concentration could be as high as <br />4150 mg/1 and still not exceed the one ton per day of salt <br />discharge limitation. Currently the TDS of the discharge is <br />' consistently less than 2000 mg/1. <br />The entire mine site has been reclaimed and seeded. Good plant <br />' growth occurred during 1966 through 1993. During 1992 a study was <br />performed at the mine site that demonstrates that untreated <br />drainage from the reclaimed area contributes fewer suspended solids <br />' than untreated drainage from the natural surrounding area, (permit <br />pages 4-19i though 4-19iii). <br /> <br />1 <br /> <br /> <br />1 <br /> <br />