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FEB-18-99 THU 09.'54-AM � _ P. 07 <br /> FEB. -11' 99(THVI 15: 1 t U.10CAL -T NORTH RE TEL!510 94k-�-'81 P. 006 <br /> DRAFT <br /> The purpose of soil and water investigation is "to assess the nature and verticai <br /> and; ere extent of the unaurhorized release and to detenttin6 a cast--effectNe meths d of <br /> cleanup.." (Cal. Code of Reqs-,tit. 23, §2725, mb& (a)) <br /> SWRCB Rssolutaon No. 92-49,Policies and Procedurw for 1"Yestiganon wed <br /> Clamp tend Abatemetu ofDischarges Umkr Water Code Seaiorr 13304 also applies to <br /> petrtalcum USI cages. Resolution No. 92-49 directs that water affected by an <br /> unautborized release atttain either bacltground water quality or dte best water quality <br /> which is reasonable tfbacWound water quiditty catmot be restored (SWRCB Resolution <br /> No. 92-49,m.G).- Any alt�%lavei*f water qusfity less suis t thm b� <br /> an=be eon=emt with the modmun benefit to the people of the state, not unreasmtmbly <br /> affe=current and anticipated bencfidd use of water, and not result in water quality loss <br /> than that prestmbed in the water quality control plan for the basin within which the site is <br /> located OWUMfter Rasin Plan)- (Ibid.) <br /> Resolution No- 92-49 does not require,however,that the r eg4sitte level of water <br /> quality be met at the rime of site closure. Even ifthe requisite feed of water quafity has <br /> not yet been attained, a site may be closed ifthe level will be attained within a reasonable <br /> e <br /> Period (SWRCB Resolution No. 92,49,17i.A). <br /> The Cenral Va cy RWQCR's Basin Plan designates existing and potential <br /> benefit W uscs of grouudwstcr in the Sart Joaquin Valley groundwatet basic as ruuseicq=1 <br /> and domestic supply(MM, agricultural supply(AMtX kdug" service supply(IND), <br /> and industrial process suppIy(PRD). (cvRWQCB&SWRCB,Water Quality Conn+ol <br /> Piaq Central Valley Region(1994)at p.II•3) The Basin Plan specifies a narrative taste <br /> and odor water quality objective as f*Aows: `Ground waters shall mx contain caste or <br /> odor-producing substaztces in concentrations th=cause nuisance or adversely aff= <br /> beadficaa.l uses." (Id. at p. III-10) The Basin Plan also contains the Mowing nanvive <br /> waw quality objective fur organo chemicals: "...ground waters designated for use as <br /> domcsdr-ar=nidpai supply(IvW shall not contain concentrations of chemicai <br /> constituents in excess of maximum contaminant fevels(MCI..$) specified in_-Title 22 ofthe <br /> California Code of Rcgutationa..," (Id. ac m-9). <br />