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C A M B R I A <br /> December 15,2005 <br /> Ms Vicla McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202-2708 <br /> Re Site Conceptual Model <br /> Former Shell Service Station <br /> 1160 West Yosemite Avenue <br /> Manteca,California <br /> SAP Code 168801 <br /> Incident No 97422510 <br /> Dear Ms McCartney <br /> Cambria Environmental Technology,Inc (Cambria)prepared this Site Conceptual Model(SCM) <br /> on behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell) for the referenced site <br /> Presented below are the site description and the SCM <br /> l SITE LOCATION AND DESCRIPTION <br /> r� The subject property is a former Shell service station located on the southeast comer of West <br /> Yosemite Avenue and South Union Road in a commercial area of Manteca,California(Figure 1) <br /> A historical site map indicates the former station layout included five dispenser islands, an <br /> underground fuel storage tank(UST)complex, and a waste oil UST The former site features are <br /> shown on Figure 2 After Shell ceased operations at this location, the property was divided into <br /> two parcels,which have subsequently been redeveloped as retail stores <br /> SCM <br /> An SCM describes the relationship between the source area, transport pathways, and potential <br /> receptors Cambia developed the SCM for the subject site based on review of all available <br /> geological and analytical data for the subject site Supporting documents for the SCM include <br /> historical soil and groundwater analytical tables, available boring and well logs for the site, <br /> sensitive receptor survey information, and a list of environmental reports for the subject site <br /> These documents along with the SCM are presented in Appendix A Some key findings of the <br /> SCM are listed below <br /> Cambria <br /> Environmental <br /> Technology,Inc • The chemicals of concern (COC) at the site are total petroleum hydrocarbons as <br /> gasoline (TPHg),benzene,xylenes, and 1,2-DCA V <br /> �0Perkins Street x'�U ,1d£it <br /> oma CA 95476 L ,L <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />