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-' A URS Operating Services,Inc. • ARR for ESI/Climar <br /> f � START.EPA Region Vl❑ Revision: 0 <br /> Contract No.68-W5-0031 Date: 0411998 <br /> Pate 9 of 37 <br /> TOTAL METALS-AQUEOUS: <br /> Total metals values from analysis of surface water collected from Tenmile Creek were compared to <br /> two different upgradient data sets. Upgradient data sets for the Tenmile mining district and the <br /> Climax Mine had minimal differences. Comparative results showed only differences between <br /> elevated concentrations of calcium and sodium. Because of the low toxicity associated with these <br /> elements, they are not discussed further in this ARR. Total metals analysis indicted elevated <br /> concentrations of aluminum and manganese at the CM NPDES discharge for approximately five <br /> downstream miles. Molybdenum was detected at elevated concentrations from the CM NPDES <br /> discharge downstream to Dillon Reservoir. Concentrations of these elements gradually decreased <br /> as the distance from the site increased. <br /> Iron and zinc were detected at elevated concentrations in total metals samples farther downgradient <br /> of the site on Tenmile Creek. Zinc was first detected at an elevated concentration at approximately <br /> two miles downstream of the CM NPDES outfall. These elevated concentrations of zinc continued <br /> until approximately ten miles downstream of the CM NPDES outfall. Iron was first detected at an <br /> elevated concentration at approximately four miles downstream of the CM NPDES outfall. These <br /> elevated concentrations of iron continued until approximately ten miles downstream of the CM <br /> NPDES outfall with exceptions of being non-detect in samples collected at six miles and nine miles. <br /> In the 1994 SSI,elevated concentrations of aluminum and zinc were identified in surface water from <br /> the CM NPDES outfall to approximately 3.1 miles downstream of the CM NPDES outfall. <br /> DISSOLVED METALS-AQUEOUS: <br /> Dissolved metals values from analysis of surface water collected from Tenmile Creek were <br /> compared to two different upgradient data sets. Upgradient data sets for the Tenmile mining district <br /> and the Climax Mine had minimal differences. Comparative results showed only differences <br /> between elevated concentrations of calcium and sodium. Because of the low toxicity associated with <br /> these elements, they are not discussed further in this ARR. Dissolved metals analysis indicated <br /> elevated concentrations of aluminum and manganese at the CM NPDES discharge for approximately <br /> three downstream miles. Molybdenum was detected at elevated concentrations from the CM NPDES <br /> 75-51119.00 <br /> F:\START\CLIMAX\Final.ARR\CLIMAX.TXT.wpd:bas <br />