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NAWQA: Contaminant Trends in Lake Sediments
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A national assessment of trends in metals and hydrophobic organic contaminants in streams and rivers of the United States using lake and reservoir sediment cores.

The Contaminant Trends in Lake Sediments (CTLS) Project is part of the U.S. Geological Survey’s National Water-Quality Assessment Program (NAWQA). The program began in 1991 with the purpose of producing a long-term assessment of the status of and trends in the quality of the Nation’s water resources. Trends in water- quality is one of the highest-priority issues for NAWQA.

CTLS Fact Sheets

All Things Related to Sealcoat

    National Summaries

    Topical Findings

    Local Results

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 U.S. Department of the Interior, U.S. Geological Survey
 Contact for NAWQA: nawqa_who@usgs.gov
 Maintainer: gs-w-tx_webmaster@usgs.gov
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 document URL- http://tx.usgs.gov/coring/index.htm
 Last Update: November 7, 2013