1. Environmental Scientist, California Environmental Protection Agency, State Water Resources Control Board, Los Angeles Region, 320 West 4th St., Suite 200, Los Angeles, CA 90013.
2. Former Graduate Researcher, Dept. of Environmental Health Sciences, School of Public Health, Univ. of California, Los Angeles, 56-070 CHS, Box 951772, Los Angeles, CA 90095-1772.
3. Professor, Environmental Science and Engineering Program, School of Public Health, Univ. of California, Los Angeles, 46-081B CHS, Box 951772, Los Angeles, CA 90095-1772.