prepared and published jointly by American Public Health Association, American Water Works Association, Water Pollution Control Federation ; joint editorial board, Lenore S. Clesceri, Arnold E. Greenberg, R. Rhodes Trussell ; Mary Ann H. Franson, managing editor
prepared for Office of Water Program Operations (WH-547), United States Environmental Protection Agency ; prepared by contractor, Roy F. Weston, Inc., subcontractor, L-Z Associates, Inc