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CHEVRON EMC "058420213 09/19 '00 "-58 N0.075 04/10 <br /> Chevron <br /> Chevron <br /> Chevron Environmental Management <br /> September 7, 2000 Company <br /> 6001'Bollinger Canyon Road <br /> P.0.Box 6012 <br /> Sen Ramon.CA 94583-0712 <br /> Mr. Philip lsoren.a, P.T. <br /> California.Regional Water Quality Control Board, Robert 0.Mihatovicb <br /> Pipoiine Program Manager <br /> Central Valley Region Phono:(926)842-1341 <br /> 3443 Routi.er Road, Suite A Facsimile:(9251842-0213 <br /> Sacramento,California 95827-3003 <br /> Confirmation of Approval <br /> Former Mansfield Property,Tracy,San .Joaquin County <br /> Former Lyoffi Loading Station., Tracy,Sa.n,Joaquin County <br /> Thompson Chevrolet Off-Site Issues, Patterson,Sta>nisl.a.u.s County <br /> California. <br /> Dear Mr. Isorena.: <br /> This letw is to confirm,your. August 29, 2000 telephone conversation.with Ms. Pen.n.y F'ottrell of <br /> Geomatrix Consultants(Geomatrix). it is Chevron.Lnvirotttln.en.tal. Management Company's <br /> (CB'MC) understanding that youapproved the revisions to the work plans for th.e subject sites. <br /> The following is a summary of the approved work plans as discussed during your telephone <br /> conversation. <br /> Former. Mansfield Pro city <br /> You approved.the proposed plan. to perform.four grab groundwater borings to characterize <br /> groundwater quality immediately d.owngra.dient of affected soil, as shown,on Figure 1. of the <br /> August 24, 2000 Geom.a.trix letter"Response to RWQ03 Comments, Former Mansfield <br /> Properly, Tracy,California". Work will be performed as approved and described in. the June 29, <br /> 2000 Geomatrix work plan. "Grab Groundwater Sampling Work Plan., Former Mansfield <br /> Property, Byron.Road.,Tracy, California." <br /> Former L, oth Loading Station <br /> You approved the proposed plan to perform two grab groundwater borings to evaluate the lateral. <br /> extent:of groundwater quality downgradi.ent of monitoring wells MW-6 a.n.d.MW-7 as shown.on. <br /> Figure 3. of the August 24, 2000 Geomatrix letter"Response to RWQCB Comments, Former. <br /> Lyoth,Loading Station ,Tracy, California". Work will. be performed as approved.and described <br /> in the June 29, 2000 Geomatrix work plan "Grab Groundwater Sampling Work Plan.,Former. <br /> Lyoth.Loading Station,26501 Banta Road, Tracy, California."As youhave discussed with Ms. <br /> Fottrell, the needto install permanent monitoring wells down.gradi,en.t of MW-6 and MW-7 will <br /> be determined after Chevron's review of the grab grou.n.dwater sample results. <br />