Document B8k5Yww2o05Rg8zEGNYOgDy78

THE TOXICOLGGI Abstracts of the 30th Annual Meeting Vol. 11, No. 1 An Official Publication of the Society of Toxicology File: Benzene Chlordane OBCP 1,3-Dichloropropene Ethylene Oibromide Heptachlor Epoxide Perchloroethylene Toxaphene Trichlorethylene Vinyl Chloride K-2661-(100) u3 K-5503K-6617K-6409- P G"Q? A K-1715- d99il < \DR-0118-7833-J K-2521- r~ --j *i jj99lJV K-5944- * K-2520- OfK K-1711-- 1 y February 1991 R&S150707 , ,. . . -- -W,i-.__ ,,, *. _ ....' \V;<5 fey 728 DEVELOPMENT OF RECOMMENDED PUBLIC HEALTH LEVELS FOR DRINKING WATER IN CALIFORNIA. Y Y Wang. BJLELam. J P Brown. A M wd A M Milca. Cali/. Dept, of Health Services. Berkeley. CA. The California Safe Drinking Water Act of 1989 requires the development of recommended public health levels (RPHLs) in addition to maximum contaminant levels (MCLs) for drinking water contaminants. RPHLs will provide additional health protection for approximately 75% of the Stax's population. RPHLs are based solely on health effects and MCLs arc to be set as close as practical to RPHLs. The Act also requires MCLs to be reviewed every five years after adoption. As of October 1990. 42 MCLs for organics and 11 for inorganics have been promulgated. Initially, 45 RPHLs (38 organics and 7 inorganics) will bo proposed. Ten of rhe RPHLs will be lower than existing MCLs: benzene, chlordanc. 1 ^-dibromo-3-chloropropanc, 1,3-dichloropropene. ethyl ene dibromide, hepiachlor epoxide, perchlorocthylcnc (PCE), toxaphene, oichlorcthylene (TCE), and vinyl chloride. RPHLs can not be enforced if the chemical can not be detected at that level. Analytical method detection limits (MDLs) need to be at least 5 to 10 times lower than the enforceable levels so that monitoring may be effectively conducted. This paper compares the RPHLs to the MDLs for data gap investigation. A preliminary analysis indicates that among the 10 chemicals, only benzene, P^E, and TOE have methods available with adequate MDLs for monitoring purposes. \-jn R&S150708