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FILE COM <br /> 440 Charter Way <br /> Page 2 <br /> Fuel additives are documented in the subsurface environment at this and adjacent sites. You are requested <br /> to analyze samples for TPH gasoline, BTEX, EDB, 1,2-DCA, Methanol, Ethanol, <br /> T�rtia u Bdwa ol, <br /> MTBE, DIPE, ETBE, and TAME during each sampling event, including q y g <br /> er <br /> , until all nota the usa /EEPMethods 5 <br /> D, the WQCand and <br /> the State Water Resources Control <br /> Board(SW <br /> Additional workplans, remobilizations and reports are costly and will likely delay site closure, please <br /> complete the recommended scope of work during your next mobilization. Please include a brief amended <br /> proposal regarding the approach discussed above in the work plan requested below.Reports generated from <br /> this next scope of work should include contaminant concentration contours in plan, elevation and transect <br /> view underlain with hydrogeologic data and information,former and current UST system appurtenances and <br /> structures should be shown on all cross sections. Report your results in the Soil and Water Investigation <br /> (SWI) Report requested below. Additional boreholes and monitor wells may be needed at this site <br /> immediately following the issuance of the SWI Report. <br /> We request that you continue to monitor the groundwater contaminant plumes on a quarterly basis. <br /> Additional wells will be required to define the down gradient extent of the plume if the plume continues to <br /> migrate or the first set of wells fail to define the plume(s). In the event continued plume migration is <br /> identified, or impact to water supply wells is predicted please include recommendations for the installation <br /> of additional wells or remediation alternatives in your Quarterly Reports. <br /> You are to to the San Joaquin <br /> nty Public Heal <br /> Services <br /> EnvironmentaleH Health Division reports gu <br /> ision (PHS/EHD)t technical At nt on: RonRo eoaccord ng o the following <br /> schedule: <br /> . 30 days from date of this letter—Brief Work Plan Addendum for completion of SWI <br /> . 45 days from work plan implementation-Soil and Water Investigation(SWI)Report <br /> . 210 days from work plan submittal-Corrective Action Plan(CAP) <br /> Failure to comply with this directive may result in referral to the Central Valley Regional Water <br /> Quality Control for a potential Cleanup and Abatement Order. <br /> Should you have questions regarding this correspondence please contact Ron Rowe at(209)468-0342. <br /> Donna Herrin,REHS,Director <br /> Environmental Health Division <br /> Margarettagorio,Supe <br /> Ronald Rowe,Sr.REHS Site Mitigation Unit <br /> Site Mitigation Unit <br /> CC: CVRWQCB—Marty Hartzell <br /> Cambria—Joe Neely <br /> 2 <br />