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CHEVRON EMC j ` ?58420213 09/19 '00 "x:58 N0.075 03/10 Mr. Robert D. Mihalovich - 2 - 3 August 2000 Thompson Chevrolet, Patterson, Stanislaus County Chevron proposes to install a boring north of MW 3, west of MW 6, east of MW 1, and sou.tb,east of MW 1, in,response to my 1.4 March request to d.ef.ne,th.e lateral extent of TPHd pollution in.these areas_ Chevron proposes to install the bori.n.g north.of MW 3 at least 230 feet rno.rtb.of MW 3 and outside the footprint of TPH-affected. soil. This location.seems too far, Another boring shouldbe placed.mi.d.wa.y between.MW 3 and.the proposed location. The boriaag east of MW I sh.ou.l.d be moved approximately 80 feet to the n.ortbwest,just outside the T.P14-affected soil footprint. The proposed. Location is too far from the TPH-affected. soil footprilit,and would, likely show.non.detectable.levels. The work plan, is approved provided that the above comments are incorporated i.n.to the work plan. Staff may request Chevron to install permanent MWs to confirm results fromth.i.s i.nvcsti.ga.ti.on. Schedule The work plans state that depen-ding on,the availability of contractors, the fieldwork,would.be sch.ed.u.led. within two weeks of staff approval midexecution.of right of entry a.greem.en.ts between. Cli.evron.and property owners. Basedon.this schedule,by 1.8 August 2000, please submit a. schedule for im.plem.enta.ti.on of the work plans. If you have any questions, you may callme at(91.6) 255-3081. or e-Pail. at isoren.p@rb5s.swrcb.ca.gov. i PHff-IPvS. ISOUNA -�. Associate Engi.n.eer cc: Ms. Margaret Lagori.o, San.Joaquin County Public Health.Services, Stockton Mr, James Simpson, Stan.i.slaus County Department of Environmental Resources,Modesto Ms. Penny Fottrel.l, Chevron,Environmental Management Company, San.Ra.m.on. II i i i i I i L