Published:
November 1, 1998
Originator:
EPA Office of Research and Development
EPA Number:
EPA 600-R-98-147

This report represents the synthesis of information published in a variety of scientific reports or contained in established scientific databases. We collected no new data specifically for the production of this report. Because of the vast number of different research projects prducing the data used in this report, no attempt was made to verify the quality of these data. It was assumed that if the data were published or were stored in establisheddatabases that they had been verified. However, any data that appeared "unusual" or questionable were checked with the originator of those data. The spatial displays presented in this report were not prepared to meet EPA spatial locational gudielines; the displays were prepared from disparate datasets and represent a best attemtp at approximating location.

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