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C A M B R I A <br /> Apnl 24, 2002 <br /> Ms Lori Duncan <br /> San Joaquin County Public Health Services r <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor N <br /> 7E _ <br /> Stockton, California 95202 <br /> Re Site Investigation Work Plan y <br /> Former Texaco Service Station r, <br /> 440 West Charter Way <br /> Stockton, California Q, <br /> SAP Code 121258 <br /> Incident No 88870583 <br /> SJCPHS/EHD Site Code 1055 <br /> Dear Ms Duncan <br /> Cambria Environmental Technology, Inc (Cambria) prepared this work plan on behalf of Shell <br /> Oil Products US (Shell) The work plan was requested by San Joaquin County Public Health <br /> Services Environmental Health Division (SJCPHS/EHD) in their March 5, 2002 letter to Equiva <br /> Services LLC As requested by SJCPHS/EHD, we have included plans for a feasibility study in <br /> this work plan A complete site background including summary of previous investigations was <br /> included in our previous site investigation report for this site The work plan presented below is <br /> written to comply with San Joaquin County Public Health Services, Environmental Health <br /> Division (SJCPHS/EHD) and Regional Water Quality Control Board (RWQCB) guidelines <br /> TECHNICAL RATIONALE FOR PROPOSED SCOPE OF WORK <br /> • Petroleum hydrocarbons have been detected in deep groundwater beneath the site <br /> Repeatable monitoring of the petroleum hydrocarbons found at depth is warranted to <br /> determine concentration trends over time <br /> • SJCPHS/EHD has directed Shell to install two sets of three wells screened at approximately <br /> Oakland CA 70 feet below grade (fbg) and 120 fbg The work plan below proposes the installation of six <br /> San Ramon CA deep screened monitoring wells (three-clusters of two wells) as per SJCPHS/EHD direction <br /> Sonoma CA <br /> P <br /> Cambria • The proposed locations of the wells are shown on Figure 2 The well locations were <br /> Environmental determined based on previous groundwater analytical data collected from cone penetration <br /> Technology, Inc testing (CPT) bonngs drilled at the site All six wells are placed along the axis of the plume <br /> *Perkins Street to allow monitoring of the plume in the suspected source area (MW-19-80 and NW-19-120), <br /> P 0 Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />