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0- <br /> 1 IN <br /> EA Engincaring.Sclince,aid TtcchnoloUy <br /> CA 949) <br /> 41S A] <br /> 11)4 <br /> FA 30 Oc I obc r 1990 <br /> ' -— <br /> Lisa Backluni. <br /> Chevron U.S.A.Inc. <br /> P0.Box 5004 <br /> 2410 Camino Ramon <br /> Sart Ramon.California 94583-080-s <br /> PX': Site Code 1138 <br /> Groundwater/Soil RcmcdWon at romr_r Cljcvmn Station <br /> 45 Put Harding Way.stockjoij,Qlifornia <br /> Dear h,41.5.Backlund: <br /> Please rcvlcw this exPlAtu dO"10 the letter dated 13 September <br /> Public Health SeMocs,rcgalding the abovc.MfCTcnced site clC I M from San Joaquin County <br /> =up Orad investigation.add-resud <br /> to Chevron U.S.A.Inc. B=u$c Of difficulties In obtaining c4sen=ts go install&groundwater <br /> mniforing w-."in El D=do Street that Is heavily L-Afficked and beicause the nd w ta Ic <br /> has been steadily declining since the wells wtm installed.EA gm wa b <br /> R wOtk Plan that differs <br /> from the%v.-k Plan submitted to San Joaquin Public I Icalth District to IntLVY 1989. M�c words P1211 authored in March 1990 Includes a proposal to install two deeper numitoring wvlIs on th rk <br /> site and two wells off th- e <br /> $i:c if A deeper water belp'J'S zone <br /> beneath the site is f to have <br /> -s Of San Joaquin County for apprm'fal, <br /> nx--ts Your approval.be subrnitted to Pub lic f1c,21th Service -Onur4nds in <br /> the wock plan.i it <br /> b=lrnp=cd by petroleum hydtocarbons from abom EA Tel found <br /> The work plan proposes further investigation of groundwater b=usc all monitoring%.cl <br /> dry or contained only raidu.,j water in the bottom cap,mWering them uscle Is wr-re <br /> ss as umniforins or <br /> extraction wells. As you can see in the Attached quarterly summary report on <br /> in September 1990).all wells went dry b,.tv=a March and July"Zr uly 1999.except <br /> N whgic'huwl'os=!pled until March IWO. ?-IW2 has since(June 19W)gone dry, The most <br /> ro=t gauging on 18 brVernber 1990 found all monitoring wells to be dry. <br /> Nl=-'vh"c'a so"ranedi3"n system has been installed according to a work plan approved in <br /> the S ring of 199M 111c system AT Originally proposed has been n iod by intruding wells <br /> N Nt%%14,NIW5 Xxtir ncl <br /> and NIW6'sso"v3POrextrAviOn%%Tits(R-efi-Sure3of ftquan y <br /> Pon). 7N.e five vapor ed re <br /> e`x=ctiOA wells WW groundwa:ff monitoring Wills htW3-6 have been <br /> plumbed to the SYs'M and"tTNti0M=!rncnt equipimnt ha.,c <br /> natural 9"supply and electrical which will be hooked- <br /> up to the system during the%va of 22 Octob�= S)stem S <br /> 29 Octobe;r 1990, startup is planned for the week of <br /> PI:Lns 10 MITXXUAIC Smundwattr cutnot be edea cicrxd <br /> ttJxi all 'on of petroleurn h turtha Undl dccM waters WV investigated <br /> ?*Mrbons;down to secondAq'M <br /> f _cL It <br /> f I!n MIS is assctu <br /> EWS=b 1990%wk plan I 1MP1==tcd u4 gmundwItcr . ouna cont1la dpcualcum <br /> T MA 1:1i "dmsardcortuncL;Onofpmpo" .... IC CV"dOhS Will be <br /> ln1MwMkPlzrt. A copy of the%,ork plan is jjt;jChW to fjciliga nXxu*r'n8 wells int <br /> te)VUr MV1CW am Comment. <br />