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<br /> <br />NATIONAL WATER-QUALITY ASSESSMENT PROGRAM <br /> <br />Identification of Water-Quality Trends Using <br />Sediment Cores from Dillon Reservoir, <br />Summit County, Colorado <br /> <br />Water-Resources Investigations Report 01-4022 <br /> <br /> <br /> <br />I... ... -..... ~ - <br />. "" <br /> <br />U.S. Department of the Interior <br />U.S. Geological Survey <br /> <br />~ - "-, - ~ <br />_ ~....-:. ,,-.-.-. "l< <br /> <br />