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CAMBRIA LJ <br /> ,t t 26 <br /> March 28, 2001 <br /> Ms Lori Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, 3`d Floor <br /> Stockton, California 95201 <br /> Re Site Investigation Work Plan <br /> Texaco-Branded Service Station <br /> 440 West Charter Way <br /> Stockton, California <br /> SAP 121258 <br /> Incident 88870583 <br /> SJCPHS Site Code 1055 <br /> Dear Ms Duncan <br /> Cambria Environmental Technology, Inc (Cambria) prepared this work plan on behalf of <br /> Equiva Services LLC to propose additional assessment at the above referenced site Cambria <br /> recommended additional site assessment in our December 20, 2000 Site Investigation Report <br /> based on the findings of that investigation Presented below is our proposed scope of work to <br /> complete this investigation A complete site background including summary of previous <br /> Investigations was included in our previous site investigation report The work plan <br /> presented below is written to comply with San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS/EHD) and Regional Water Quality Control Board <br /> (RWQCB)guidelines <br /> WORK PLAN <br /> Technical Rationale for Proposed Scope of Work <br /> a Petroleum hydrocarbons were detected in deep groundwater samples collected from boring <br /> CPT-1 through CPT-4 Further assessment of the extent of petroleum hydrocarbons in <br /> Oakland, CA groundwater at depth is warranted <br /> San Ramon CA <br /> Sonoma, CA . The highest concentrations of petroleum hydrocarbon were found in borings CPT-1 and <br /> Cambna CPT-3 Boring CPT-1 was located onsite near the suspected source area, the former <br /> environmental northeastern dispenser, and CPT-3 was located offsite, east (downgradient) of the site <br /> Tedmoiogy,inc Although petroleum hydrocarbon concentrations were lower in CPT-3 than in CPT-1, <br /> *Perkins Street <br /> P O Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> fax(707)935-6649 <br />