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• fDD� <br /> l� Chevron <br /> Chevron Environmental Management <br /> September 7, 2000 Company <br /> 6001 Bollinger Canyon Road <br /> P.0.Box 6012 <br /> San Ramon,CA 94583-0712 <br /> Mr. Philip Isorena, P.E. <br /> ich <br /> California Regional Water Quality Control Board, Robert U.Pipeline Prrogog al Manager <br /> Manager <br /> Central Valley Region Phone:19251842-1341 <br /> 3443 Routier Road, Suite A Facsimile:19251842-0213 <br /> Sacramento, California 95827-3003 <br /> Confirmation of Approval <br /> Former Mansfield Property, Tracy, San Joaquin County <br /> Former Lyoth Loading Station, Tracy, San Joaquin County <br /> Thompson Chevrolet Off-Site Issues, Patterson, Stanislaus County <br /> California <br /> Dear Mr. Isorena: <br /> This letter is to confirm your August 29, 2000 telephone conversation with Ms. Penny Fottrell of <br /> Geomatrix Consultants (Geomatrix). It is Chevron Environmental Management Company's <br /> (CEMC) understanding that you approved the revisions to the work plans for the subject sites. <br /> The following is a summary of the approved work plans as discussed during your telephone <br /> conversation. <br /> Former Mansfield Property <br /> You approved the proposed plan to perform four grab groundwater borings to characterize <br /> groundwater quality immediately downgradient of affected soil as shown on Figure 1 of the <br /> August 24, 2000 Geomatrix letter "Response to RWQCB Comments, Former Mansfield <br /> Property, Tracy, Califomia". 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 Lyoth Loading Station <br /> You approved the proposed plan to perform two grab groundwater borings to evaluate the lateral <br /> extent of groundwater quality downgradient of monitoring wells MW-6 and MW-7 as shown on <br /> Figure 1 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 you have discussed with Ms. <br /> Fourell, the need to install permanent monitoring wells downgradient of MW-6 and MW-7 will <br /> be determined after Chevron's review of the grab groundwater sample results. <br />