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URS Operating Services.Inc. — ARR for ESklimae <br /> START.EPA Re-ion Vlll Revision: 0 ` <br /> Contract No.68-Z-003I Date: 04/1998 <br /> Page 15 of37 <br /> of 180 ppb. Concentrations of total zinc(2.1,3.1,and 6.1 miles)and dissolved zinc(2.1 miles)were above <br /> the AWQC benchmark of 110 ppb. One concentration of dissolved silver was above the AWQC benchmark <br /> of 2.3 ppb at 1.1 miles. <br /> Water from Tenmile Creek flows into Dillon Reservoir approximately 12.1 downstream miles north-northeast <br /> of the CM NPDES discharge. Dillon Reservoir is a drinking water supply storage for the city of Denver. <br /> The drinking water intake for water stored in Dillon Reservoir is located approximately 55 miles downstream <br /> on the South Platte River at Strontia Springs Reservoir. <br /> In the late 1880s, the fishery on Tenmile Creek was completely eradicated by the impacts of acidic mine <br /> water drainage, smelter effluent and waste from the mining settlements. By 1971, Tenmile Creek was <br /> restored as a fishery by the installation of the two diversion canals by CM,thus reducing acid mine drainage <br /> released to Tenmile Creek. The headwaters of Tenmile Creek have been diverted from historical flow <br /> patterns to avoid contact with site contaminants. <br /> Tenmile Creek is a viable fishery that supports game fish species including brook, cutthroat and rainbow <br /> trout. Production data for Tenmile Creek have not been compiled. National Wetlands Inventory maps have <br /> not been completed for this region but approximately 0.56 miles of palustrine scrub-shrub and forested <br /> wetland frontage were observed and delineated along the first 3.1 miles of Tenmile Creek. Additional <br /> wetlands exist from 3.1 miles to Dillon Reservoir; however,they were not delineated for this ESI. <br /> Summary Table of Exceedence of Applicable Benchmarks From ESI Data <br /> Element,Type of Outfall 1.1 2.1 3.1 4.1 5.1 6.1 7.1 8.1 9.1 10.1 11.1 12.1 <br /> Benchmark,and(Value) Miles Miles Miles Miles Miles Miles Miles Miles Miles Miles Miles Miles <br /> Total Manganese,DW— X X X X <br /> RD/SC,(180 ppb) <br /> Dissolved Manganese,. X X X <br /> DW RD/SC,(180 ppb) <br /> Total Molybdenum, X X X X X X X X X X X X <br /> DW RD/SC,(180 ppb) <br /> Dissolved Molybdenum, X X X X X X X X X X X X <br /> DW RD/SC,(180 ppb) <br /> 75-51119.00 <br /> F:\START\CLIMAX\Final.ARR\CLIMAX.TXT.,.vpd:bas <br />