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i <br /> 1 <br /> Onsite and Offsite Assessment Report 3 <br /> The Southland Corporation,2725 Country Club Boulevard,Stockton,Califomia November 30,1998 <br /> conductor casings are composed of 104nch diameter solid Schedule 40 PVC piping and extend to <br /> approximately 12 feet BGS. Each conductor casing is protected at the surface by 10-diameter slip cap <br /> and traffic-rated street box(with watertight bolted lid)set in concrete. <br /> 1.2 Geology/Hydrogeology <br /> Groundwater was encountered in the excavation at a depth of approximately 8 feet to 11 feet below <br /> ground surface (BGS). According to Mr.Michael Infurna of the SJCPHS,typical groundwater levels in <br /> the site area are about 20 feet below grade. Mr. Infurna has indicated that the normal groundwater flow <br /> direction for the site vicinity is to the northeast. <br /> A northeast gradient configuration places the Southland site upgradienticrossgradient from the ' <br /> USA/Exxon, and upgradient from part of the Patmon Property. The USA/Exxon is also <br /> upgradient/crossgradient from the Patmon Property(see Figure 2). <br /> i <br /> I <br /> A well survey was conducted at the Department of Water Resources(DWR) and the local municipal <br /> water agency to locate all water supply wells and surface water bodies within a 2,000-foot radius of the <br /> site. Well search information indicated there are few active wells within a 2,000-foot radius of the site, i <br /> t. and most wells included in the list are perforated starting at depths of about 100 feet below grade or <br /> deeper(Appendix C). <br /> l <br /> Soil types encountered beneath the former USTs consisted of clayey sandy silt, silty clay, and silty <br /> sand. <br /> 2.0 SITE ASSESSMENT WORK <br /> a <br /> 2.1 Permitting/Site-Specific Health and Safety Plan i <br /> Fluor Daniel GTI obtained permits for the soil borings from the SJCPHS prior to proceeding with site <br /> assessment work. I <br /> Fluor Daniel GTI prepared a site-specific Health and Safety Plan as required by the Occupational <br /> Safety and Health Administration (OSHA) Standard "Hazardous Waste Operations and Emergency i <br /> Response"guidelines(29 CFR 1910.120).The document was reviewed and signed by all Fluor Daniel <br /> _ GTI personnel and subcontractors prior to commencement of work at the site. <br /> j <br /> I <br /> (- umw-rpt <br /> FLUOR DANIEL GTI <br /> 1 <br /> 4,, <br />