SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

I rr-I:rinnl;il R..vrnnlendnll+Ins � P:1�c'i r?I =-t Notes for Table 1: Waley Quality Objectives for groundwater from the Water Ouality Control Plan(Basin Plan)lot the Sacramento River Basin and the San Joaquin River Basin,Fourth Edition Similar language is found in the Tulare.Lak.e Basin Plan Chemical Constituents ' Ground waters shall not contain chemical constituents in concentrations that adversely affect beneficial uses At a minimum,around waters designated for use as domestic or municipal supply(MUN)shall not contain concentrations of chemicalconstituents in excess of the maximum contaminant levels.(MCLs)specified in the following provisions of Title 22 of the California Code of Regulations_which are incorporated by reference into this plan.Tables 64431-A(Inorganic Chemicals)and 64431-e(Fluoride)of Section 64431.Table 64444-A.(Organic Chemicals)of Section 64444.and Tables 64449-A-(Secondary Maximum Contaminant Levels-Consumer Acceptance Limiis)and 64449-6 (SecondaryMaximum Contaminant Levels-Ranges),of Section 64449. This incorporation-by-reference is prospective,including future changes to the incorporated provisions as the changes take effect. At a minimum.water designated for ureas domestic or municipal _ supply(MUN)shall.not contain lead In excess of 0 015 mg/I. To protect all beneficial uses.the Regional Water Board may apply limits more stringent than MCLS. - - - - To� Ground waters shall be maintained free of toxic substances in concentrations that produce detrimental physiological responses in human,plant.animal,or aquatic life associated with designated beneficial use(s). This objective applies regardless of whether the toxicity is caused by a single-substance or the.interactive effect of multiple substances. Tastes and Odors - - - Ground waters shall not contain taste-or odor-producing substances iri concentrations that cause nuisance or adversely affect beneficial uses. (b) Primary MCLS are human health based•ibut also may reflect other factors,relating to technologic and economic feasibility of attainment and monitoring in a water distribution system;and at the tapThese factors may'not be relevant for the water resource. !c) 1-in-a-million cancer risk estimate derived from published oral cancer slope factor by assuming 2 literslday water consumption and 70 kg body weight. - td) 1f adopted as proposed.this limit would become the numerical limit used to interpret this objective. re) Health advisory=4000 ug/L for 10 day exposure or less. No lifetime exposure advisory has been developed. However. lifetime health advisories are normally at least ten-fold Lower than 10-day.advisories. Therefore.a level of 400 ug/L would be a reasonable estimate of a lifetime protective level. - _ (t) Secondary MCLS are human welfare based,but also may reflect other factors relating to technologic and economic feasibility of attainment and monitoring in a water distribution system and at the tap These factorsmaynot be relevant for the water resource. (g) Value listed is for 1.3.5-trimethylbenzene. Taste and odor treshold should be similar for 1.2.4-dimethylbenzene (h1 Liability under Proposition 65 may also exist for responsible parties where levels in water exceed 0.25 ug/L. _ (i) Listed value assumes 2 liters/day water consumption.70 kg body weight.and 20%relative source contribution from drinking water (j) Concentrations of individual PAHs are adjusted by dividing the concentrations by the potency equivalency factors(PEFs)in . the table on the following page. The limit applies to the sum of these adjusted concentrations. For dcllllmonsof lerllls and acronN nis used 111 Fable-1picase see the stall rc'porl, I C oillplic'Illpn of If"Nett-011(l/lll' (;n(1/S a\ailahl'on the intcrnel at docunlenlsA\q_pals pages 9 to I ,ur... ;mrrab.,[ Inn\I;rrha.k"C RP.f?(-'13 1AI?rit"01.14