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CAM B R I A <br /> November$,200I'` <br /> Mr. Sam Savig. <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Avenue,Third Floor <br /> Stockton,California 95202 A' <br /> Re: Site Investigation Work Plan <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, California <br /> 'SAP Code 136147 <br /> Incident No. 98996187 <br /> SJCPHS/EHD Site Code 1058124 <br /> Dear Mr. Savig: <br /> Cambria Environmental Technology, Inc..(Cambria)prepared this work plan on behalf of Equiva <br /> Services LLC (Equiva) pursuant to San Joaquin County Public Health Services, "Environmental <br /> Health Division's (SJCPHS/EHD's) October. 1, 2001 letter to Equiva. The purpose of this <br /> investigation is to further assess the lateral_extent of petroleum constituents in deep groundwater <br /> zones beneath and east of.the site, and the.scope of work presented in this document will comply <br /> with SJCPHS/EHD and Regional Water Quality Control Board guidelines. <br /> a Site Background <br /> Site Description: The subject:site is an active.Shell-branded service station located at 620 West <br /> Charter Way,:east of Interstate 5 in Stockton,,;Califomia (Figure 1). The site layout includes a <br /> service station building, six dispenser islands, an existing fuel underground storage tank (UST) <br /> complex,a former UST complex, and a car wash(Figure 2). <br /> Previous Investigations: During February:--X1989, Delta Environmental. Consultants (Delta) <br /> drilled eight soil borings to assess site conditions prior to UST removal and replacement <br /> activities. In November 1989, four USTs were excavated and removed. Soil samples were <br /> Oakland, CA collected from former tanks and product line trench excavations. <br /> San Ramon, CA <br /> Sonoma, CA <br /> Between December 1989 and January 1990,Delta installed groundwater monitoring wells MW-1 <br /> Cambria through MW-7. Underground piping was installed to wells MW-2, MW-3, MW-4, MW-5, and <br /> Environmental <br /> Technology,Inc. MW-7 for future remediation. Two additional groundwater monitoring wells (MW-8 and <br /> MW-9) were installed in,March 1990. <br /> 270 Perkins Street <br /> P.O.Box 259 <br /> Sonoma,CA.95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />