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This website was prepared by the organizations named below as an account of work sponsored by the Water Environment Research Foundation (WERF). Neither WERF, members of WERF, the organizations named below, nor any person acting on their behalf: (a) makes any warranty, express or implied, with respect to the use of any information, apparatus, method, or process disclosed in this website or that such use may not infringe on privately owned rights; or (b) assumes any liabilities with respect to the use of, or for damages resulting from the use of, any information, apparatus, method, or process disclosed in this website.

Organizations that helped prepare this report:

• Tetra Tech, Inc.
• WENK Associates

This website was reviewed by a panel of independent experts selected by WERF. Mention of trade names or commercial products does not constitute WERF nor EPA endorsement or recommendations for use. Similarly, omission of products or trade names indicates nothing concerning WERF's nor EPA's positions regarding product effectiveness or applicability.

The research on which this website is based was funded, in part, by the United States Environmental Protection Agency through Cooperative Agreement No. CR-83155901-1 with the Water Environment Research Foundation (WERF). Unless an EPA logo appears on the site, this website is a publication of WERF, not EPA. Funds awarded under the Cooperative Agreement cited above were not used for editorial services, reproduction, printing, or distribution."

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