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RECOMMENDED LI IN WATER FOR PETROLEUM-BASE*UEL COMPONENTS <br /> TO PROTECT THE NEFICIAL USE OF MUNICIPAL AND DOMESTIC SUPPLY t <br /> Aromatic Hydrocarbons— <br /> Benzene 1.0 µg/! California Primary MCL' <br /> 0.35 µg11 1-in-a-million incremental cancer risk level (OEHHA)` } <br /> n-Burylbenzene 45 4g/1 California Drinking Water Action Level (DHS) <br /> Ethylbenzene 700 µg/1 California and USEPA Primary MCL' <br /> 29 4g11 Taste and odor threshold (USEPA)3 <br /> Toluene 150 µg/1 California Primary MCL' <br /> 42 µgA Taste and odor threshold(USEPA)3 <br /> Xylenes (sum of isomers) 1750 µg/l California Primary MCL' <br /> 17 µg11 Taste and odor threshold(USEPA)3 <br /> Aliphatic Hydrocarbons— <br /> n-Hexane 400 µg/1 USEPA Health Advisory] <br /> Hydrocarbon Mixtures— <br /> Diesel or Kerosene 100 µg/1 Taste and odor threshold (USEPA)5 <br /> Gasoline 5 µg11 Taste and odor threshold(SWRCB)6 <br /> Additives— <br /> Lead 15 agll USEPA Drinking Water Action Level <br /> Ethylene dibromide (EDB) 0.05 µg/1 California and USEPA Primary MCL' <br /> Ethylene dichlorides OS µg11 California Primary MCL' <br /> Methyl t-buryl ether(MTBE) 35 4g/1 California Drinking Water Action Level (DHS) <br /> Polynuclear Aromatic Hydrocarbons(PAHs or PNAs)— <br /> Carcinogenic PAHs9 0.0029 µg11 I-in-a-million incremental cancer risk level (OEHHA)' <br /> Acenaphthene 20 µg/1 USEPA NAWQC10(taste and odor) <br /> Anthracene 2100 µ;ll USEPA IRIS reference dose' <br /> Benzo(a)pyrene 0.2 µg11 California and USEPA Primary MCL1 <br /> Dibenz(a,h)anthracene 0.0085 4g/1 l-in-a-million incremental cancer risk level (OEHHA)' <br /> Naphthalene 20 ug/1 USEPA Health Advisory <br /> 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 /> '- Derived from oral cancer potency factor published by the California Environmental Protection Agency.Office of <br /> Environmental Health Hazard Assessment,assuming 2 litersiday water consumotion and 70 kg body weight. <br /> 3 Federal Register,Vol. 54,No. 97, <br /> g pp.22138.22139. <br /> l Health advisory =4000µ,a <br /> i1 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 100 µg11 would be a reasonable estimate of a lifetime protective level for n-hexane. <br /> 5 1980 Health Advisory. Document states that the 100 go 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 10µg11 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 /> 7 Liability under Proposition 65 may also exist for responsible parties where levels in water exceed 0.25 u_e/l. <br /> 8 Also know as 1,2-dichloroethane. <br /> 9 Based on benzo a <br /> Opyrene;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)an attached table. <br /> 10 National Ambient Water Quality Criteria <br /> 1' Integrated Risk Information System: listed value assumes 2 litersiday water consumption. 70 kg body weight and <br /> 20% relative source contribution from drinking water. ,191 17 ktay 1995 <br />