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• <br />Comprehensive Analytical Resulu Aeport <br />Pas[ and Wes[ Willow Creek <br /> <br />F <br />6 <br />L <br />7 <br />~ .. <br />Creede Mining District Aqueous Surface Water Samples <br />(concentrations in micrograms per liter) <br />Analyse prenge <br />Background Average Value Elevated <br />Release Sample N Elented <br />Release Samples Fiighat <br />Relnse Value l.oration <br />Highest Release Sample <br />Arsen¢ (Dis) + + + + <br /> + + + a <br />Cadmium (Dis) s + <br /> + + <br />CDDDer (Dis) + - s <br /> + + + <br />Iron (Dis) + + <br /> + o <br /> <br /> + o + <br />Mangaruae (D'u) - <br /> <br />Zinc (Dis) + <br /> <br />For aquatic life the primary metals of concern are cadmium, lead, and zinc. These metals are widespread <br />and are frequently present at concentratioru which greatly exceed the Ambient Water Quality Criteria for <br />surface waters found in the Superfund Chemical Data Matrix (SCDM) (Cadmium 1.1, Lead 3.2, and Zinc <br />110, values in micrograms per liter). In addition, the Table Value Standards adopted by the Colorado <br />Water Quality Control Commission are exceeded along sections of East Willow Creek and the Rio Grande <br />River for lead (at 6 locations) and for zinc (at 9 locations). <br />Surface water and sediment samples analyzed fot cyanide were found to be non-detect. Surface water <br />samples analyzed for organics were found to be non-detect. One sediment sample was found to contain <br />several semivolatile organic analyzes (SE-32, Table 6, see discussion in Section 5.3.4). <br />For sediment samples, elevated concentrations for 12 metals were observed at one or more locations for <br />a total of 160 instances. Eleva[ed metals concentrations for sediment samples occurred at a higher <br />frequency than that of aqueous samples, nonetheless, there is general correlation geographically between <br />aqueous and sediment locations which exhibit elevated concentrations. The following table summarizes <br />the sediment data. <br />8 <br />