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Environmental!Technical support Unit-(916)255-3015-C-Ma ed:Tuesday,13 June 1995 4.17 P M- Page 2 d 3 <br /> -- . ------------------r ---------. -------_–_ --------- --------------------------- <br /> RECOMMENDED LIMITS IN WATER FOR PETROLEUM-BASED FUEL COMPONENTS <br /> TO PR OTE CT THE BENEFICIAL USE OF M Uj VICIPALAND DOMES77C SUPPLY <br /> Aromatic Hydrocarbons — <br /> Benzene 1.0 yrgli Califo Primaxy MCL' <br /> 0.35 Ngo1 1-ina- illion incremental cancer risk level(OEHHAf <br /> n-Butylbenzene 45 jAgfl Californ a Drinking Water Action Level(DHS) <br /> Ethylbenzene 700 Ngt f Califorina and USEPA Primary MCL <br /> 29 yigll Taste ar d odor threshold(USFPA <br /> Toluene 150 yrgil Califon Primary MCLI <br /> 42 yrgil Taste ar d odor threshold(USEPA} <br /> Xylenes(sum of isomers) 1750 ygll Califon Primary MCLI <br /> 17 yg/1 Taste aT d odor threshold('USEPAJ <br /> Aliphatic Hydrocarbons — 4 <br /> n-Hexane 400 y40 USEPA Health Advisory <br /> Hydrocarbon Miztum — <br /> Diesel or Kerosene 100 )cgll Taste d odor threshold(USEPA; <br /> Gasoline 5 vigil Taste odor threshold(SWRCB)6 <br /> Additives — <br /> Lead 15 yrgll USEPA Drinking Water Action Lev e17 <br /> Ethylene dibromide(EDB) 0.05 ugll California and USEPA Primary MCL' <br /> Ethylene dichloride$ 0.5 yigll CaliforniaPrimary MCL <br /> 0.001 yrgll I-in-a-irtillion incremental cancer risk level(OEHHA) <br /> Methyl t butyl ether(NIrBE) 35 yigll Califon ' Drinking Rater Action Level(DHS) <br /> Polyrruclearrlrornatw Hydrocarbons(PAHs or PNAs) <br /> Carcinogenic PAW 0.0029 wgfl 1-ina- 'llion incremental cancer risk level(OEHHA} <br /> Acenaphthene 20 ]4g/l USEPA NAWQC10(taste and odor) <br /> Anthracene 2100 yo USIEPA IRIS reference dose <br /> Benzo(a)pyrene 0.2 )40 Califor iia and USEPA Primary MCL' <br /> Dibenz(a,h)anthracene 0.0085 y�gfl 1-in�a llion incremental cancer risk level(OEHHA)z <br /> Naphthalene 20 yigll USEPA.Health Advisory <br /> ' Primary MCLS are health based,but also reflect other facto relating to technologic and economic feasibility of <br /> attainment and monitoring in a water distribution system at the tap,not necessarily in the water resource. <br /> 2 Derived from oral cancer potency factor published by the C ilifomia Environmental Protection Agency,Office of <br /> Environmental Health Hazard Assessment,assuming 2 liter sJday water consumption and 70 kg body weight <br /> 3 Federal Register, Vol.54,No.97,pp.22138,22139. <br /> 4 Health advisory=4000 jue for 10 day exposure or less. N lifetime exposure advisory has been developed. <br /> However,lifetime health advisories arenarmally at least tei-fold lower than 10-day advisories. Therefore,a level <br /> of 400 ygil would be a reasonable estimate of alifetime pr restive level for n-hexane. <br /> 5 1980 Health Advisory. Document states that the loo pigll it vel should be health protective for 10 days of <br /> expasur a or less. No lifetime exposure advisory has been dwelopeil. However,lifetime health advisories are <br /> normally at least ten-fold lower than 10-day advisories. Thuureforc,a level of 10,Mgll would be a reasonable <br /> estimate of a lifetime health protective level for diesel or kcrosene. <br /> 6 McKee&Wolf,Water Quality Criteria,2nd Fd,State Watar resources Control Bard(1953, 1978)p.230. <br /> 7 Liability under Proposition 65 may also exist for responsible parties where levels in water exceed 0.25 Ygd. <br /> s Also know as 1,2-dichlomethane. <br /> 9 Based on benzo(a)pyrene; see 22 CCR§12000(Propositio 65)for list of carcinogens; criteria for individual <br /> PAHs may be calculated by dividing cancer risk level by w 'ghting factors(PEFs)on attached table <br /> to National Ambient Water Quality Criteria <br /> n Integrated Risk Information System;listen value assumes litersiday water consumption,70 kg body weight,and <br /> 20%relative source contribution from drinking water. ,®1 17 May 1995 <br />