ARCHIVED REPORTS XR0000211 - Laserfiche WebLink

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SECTIONONE 0®tr®dued u a "The total dissolved solids (TDS) exceed 3,000 milligrams per titer (mg/1) (5,000 mhos/cm, electrical conductivity) and it is not reasonably expected by the Regional Water Board [for the ground water] to supply a public water system", or 0 "There is contamination, either by natural processes or by human activity (unrelated to a specific pollution incident), that cannot reasonably be treated for domestic use using either Best Management Practices or best economically achievable treatment practices", or o "The water source does not provide sufficient water to supply a single well capable of producing an average, sustained yield of 200 gallons per day", or o "The aquifer is regulated as a geothermal energy producing source or has been exempted administratively pursuant to 40 CFR, Section 146 4 for the purpose of underground injection of fluids associated with the production of hydrocarbon or geothermal energy, provided that these fluids do not constitute a hazardous waste under 40 CFR Section 2613 " The basin plan specifies a narrative taste and odor water quality objective as follows "Groundwaters designated for use as domestic or municipal supply (MUN) shall not contain taste- or odor-producing substances in concentrations that cause a nuisance or adversely affect beneficial uses " The basin plan also contains the following narrative water quality objective for toxic substances as follows " groundwaters designated for beneficial use as domestic or municipal supply (MUN) shall not contain concentrations of constituents in excess of the maximum contaminant levels(MCLs) specified in Title 22 of the California Code of Regulations " (Id at 3-6) IWith regard to the water quality objective for toxicity, the State Department of Health Services(DHS) has set a MCL for drinking water of 1 part per Whon(ppb)for benzene, 100 ppb for toluene, 680 ppb for ethylbenzene, and 1,750 ppb for xylene (Cal Code of Regs, Title 22, § 64444) Although DHS has not yet set an MCL for methyl-tertiary-butyl-ether(MTBE),DHS has set an interum action level of 35 ppb (DHS Memorandum from Joseph P Brown, Ph D, Acting Chief Water Toxicology Unit to Alexis M MUea, P E, Acting Supervisor, Standards and Technology Unit, Office of Dnniang Water (February 19, 1991) p 2) DHS has more recently proposed a 5 ppb MTBE concentration as a secondary drinking water standard for taste and odor(DHS Drmlang Water MCLS, January 7, 1999) The threshold odor concentration of commercial gasoline (measured as total petroleum hydrocarbon gasoline, or TPH g)in water is commonly accepted to be 5 ppb,with 10 ppb giving a strong odor The threshold odor concentration of commercial diesel (measured as TPH-d) in water is commonly accepted to be 100 ppb(SWRCB, Water Quality Criteria(2d ed 1963)p 230) ® T%1987W7300ONA%STOGKTOMREPORT%SHOREPtM D0GI8-FEB-MQ73009NA%SNA 1-3