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CAMBRIA <br /> October 7, 2004 <br /> Ms Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 E Weber Avenue, Third Floor RECEIVED <br /> Stockton, California 95202 <br /> Re Site Conceptual Model OCT 12 2004 <br /> Shell-branded Service Station SWIRCNMENT HMI H <br /> 620 West Charter Way PERMIT/SERVICES <br /> Stockton, California <br /> SAP Code 136147 <br /> Incident No 98996187 <br /> SJCEHD Site Code 1058124 <br /> I <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) as requested in San <br /> Joaquin County Environmental Health Department (SJCEHD) correspondence dated <br /> July 2, 2004 As discussed with SJCEHD staff, the approved cone penetration test (CPT) <br /> investigation was not completed prior to submittal of this SCM <br /> SITE BACKGROUND <br /> Site Description <br /> The subject site is an active Shell-branded service station located at 620 West Charter Way, east <br /> of Interstate 5 in a commercial area of Stockton, California (Figure 1) The site layout includes a <br /> service station building, six dispenser islands, a fuel underground storage tank (UST) complex, <br /> and a car wash (Figure 2) <br /> Previous Investigations <br /> During February 1989, Delta Environmental Consultants (Delta) drilled eight soil borings to <br /> assess site conditions prior to UST removal and replacement activities In November 1989, four <br /> USTs were excavated and removed Soil samples were collected from former tanks and product <br /> Cambria line trench excavations <br /> Environmental <br /> Technology,Inc <br /> Between December 1989 and January 1990, Delta installed groundwater monitoring wells MW-1 <br /> 0 Hollis Street <br /> Suite A through MW-7 Underground piping was installed to wells MW-2, MW-3, MW-4, MW-5, and <br /> Emeryville CA 94608 <br /> tel(510)420-0700 <br /> -10)420-9170 <br /> L- - - — <br />