Laserfiche WebLink
RECOMMENDED LIMITS IN WATER FOR PETROLEUM-BASED FUEL COMPONENTS <br /> TO PROTECT THE BENEFICIAL USE OF MUNICIPAL AND DOMESTIC SUPPLY <br /> Aromatic Hydrocarbons— <br /> Benzene 1.0 µg/l California Primary MCLI <br /> 0.35 µg/l 1-in-a-million incremental cancer risk level(OEHHA)2 <br /> n-Butylbenzene 45 µg/l California Drinking Water Action Level (DHS) <br /> Ethylbenzene 700 µg/1 California and USEPA Primary MCL' <br /> 29 µg/l Taste and odor threshold(USEPA)3 <br /> Toluene 150 µg/l California Primary MCLI <br /> 42 µg/1 Taste and odor threshold(USEPA)3 <br /> Xylenes (sum of isomers) 1750 µg/l California Primary MCLI <br /> 17 µg/l Taste and odor threshold(USEPA)3 <br /> Aliphatic Hydrocarbons— <br /> n-Hexane 400 µg/l USEPA Health Advisory4 <br /> Hydrocarbon Mixtures— <br /> Diesel or Kerosene 100 µg/l Taste and odor threshold(USEPA)5 <br /> Gasoline 5 gg/l Taste and odor threshold(SWRCB.)6 <br /> Additives— <br /> Lead 15 µg/l USEPA Drinking Water Action Level' <br /> Ethylene dibromide(EDB) 0.05 µg/l California and USEPA Primary MCLI <br /> Ethylene dichloride$ 0.5 µg/1 California Primary MCLI <br /> 0.001 µg/l 1-in-a-million incremental cancer risk level (OEHHA)2 <br /> Methyl t-butyl ether(MTBE) 35 µg/1 California Drinking Water Action Level(DHS) <br /> Polynuclear Aromatic Hydrocarbons(PAHs or PNAs)— <br /> Carcinogenic PAHs9 0.0029 µg/1 1-in-a-million incremental cancer risk level(OEHH.'. <br /> Acenaphthene 20 µg/l USEPA NAWQC 10(taste and odor) <br /> Anthracene 2100 µg/1 USEPA IRIS reference dose 11 <br /> Benzo(a)pyrene 0.2 µg/l California and USEPA Primary MCL' <br /> Dibenz(a,h)anthracene 0.0085 µg/l 1-in-a-million incremental cancer risk level(OEHHA)2 <br /> Naphthalene 20 µg/l USEPA Health Advisory <br /> 1 Primary MCLs are health based,but also reflect other factors relating to technologic and economic feasibility of <br /> attainment and monitoring in a water distribution system and at the tap, not necessarily in the water resource. <br /> 2 Derived from oral cancer potency factor published by the California Environmental Protection Agency,Office of <br /> Environmental Health Hazard Assessment,assuming 2 liters/day water consumption and 70 kg body weight. <br /> 3 Federal Register,Vol.54,No.97,pp. 22138,22139. <br /> 4 Health advisory=4000µg/1 for 10 day exposure or less. No lifetime exposure advisory has been developed. <br /> However,lifetime health advisories are normally at least ten-fold lower than 10-day advisories. Therefore,a level <br /> of 400 gg/l would be a reasonable estimate of a lifetime protective level for n-hexane. <br /> 5 1980 Health Advisory. Document states that the 100µg/1 level should be health protective for 10 days of <br /> exposure or less. No lifetime exposure advisory has been developed. However,lifetime health advisories are <br /> normally at least ten-fold lower than 10-day advisories. Therefore,a level of 10µg/1 would be a reasonable <br /> estimate of a lifetime health protective level for diesel or kerosene. <br /> 6 McKee&Wolf, Water Quality Criteria,2nd Ed.,State Water Resources Control Board(1963, 1978)p.230. <br /> ' Liability under Proposition 65 may also exist for responsible parties where levels in water exceed 0.25µg/1. <br /> 8 Also know as 1,2-dichloroethane. <br /> 9 Based on benzo(a)pyrene;see 22 CCR§12000(Proposition 65)for list of carcinogens;criteria for individual <br /> PAHs may be calculated by dividing cancer risk level by weighting factors(PEFs)on attached table. <br /> to National Ambient Water Quality Criteria. <br /> 11 Integrated Risk Information System;listed value assumes 2 liters/day water consumption,70 kg body weight,and <br /> 20%relative source contribution from drinking water. J% 17 May 1995 <br />