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n �I <br /> 19449 Riverside Drive,.Suite 230,Sonoma,California 95476 <br /> CONESTOGA-ROVERS Telephone: 707.9354850 Facsimile: 7079356649 <br /> &ASSOCIATESwww.CRAworld.com k <br /> December 3,2007 <br /> Mr. Frank Girardi R LE CE N E D <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street DEC 0 6 2007 <br /> Stockton, California 95202 1. <br /> ENVIRONMENT HEALTH <br /> PERMIT/SENVICES <br /> Re: Subsurface Investigation Work Plan and Agency Response <br /> Shell-branded Service Station <br /> 2320 North El Dorado Street <br /> Stockton,California <br /> SAP Code 136145 <br /> Incident No. 97471966 <br /> Dear Mr. Girardi: <br /> Conestoga-Rovers & Associates (CRA) prepared this work plan on behalf of Equilon Enterprises LLC <br /> dba Shell Oil Products US (Shell) to further assess the extent of petroleum hydrocarbons and fuel <br /> y <br /> oxygenates in groundwater beneath the referenced site (Figures 1 and 2) as requested by the'San Joaquin <br /> County Environmental Health Department (SJCEHD) in their October 11, 2007 letter to'.Shell. The <br /> proposed scope of work complies with SJCEHD and Central Valley Regional Water Quality Control <br /> Board (RWQCB) guidelines. This work plan supersedes Cambria Environmental Technology, Inc.'s <br /> previously approved October 4, 2004 Site Investigation Work Plan. This document also piovides a <br /> response to additionally requested items in SJCEHD's October 11,2007 letter. <br /> SITE LOCATION AND DESCRIPTION <br /> The subject property is an operating Shell-branded service station located on the southeast'corner of the <br /> El Dorado Street and Hampton Street intersection in a mixed commercial and residential area of <br /> Stockton, California (Figure 1). The station layout includes three underground storage tanks (USTs), <br /> four dispenser islands,and a service station building(Figure 2). $ <br /> AGENCY RESPONSE <br /> The following provides a response to the SJCEHD's comments in their October 11, 2007 letter not <br /> pertaining to additional vertical and horizontal site assessment. <br /> Source of Contamination: As previously documented, the subject site appears to have been impacted by <br /> I: <br /> a petroleum hydrocarbon plume originating from the adjacent, upgradient Castle Motors site located at = <br /> Equal <br /> Employment <br /> Opportmity Employer J <br /> NOMINEES <br /> Worldwide Engineering,Environmental,Construction,and IT Services J <br /> Ia IJ/ <br />