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C A M B R I A <br /> Z40Z <br /> i�0 V <br /> November 15,2002 <br /> a � <br /> Technical ��NLSI r <br /> Services Supervisor 1��V1Fi�l 1�'Itt � <br /> c/o Mr Richard Stiffler PERMMSERVICES <br /> City of Stockton Department of Municipal Utilities <br /> Environmental Control Section <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> Re Self-Monitoring Report <br /> Shell-branded Service Station <br /> 2575 Country Club Blvd <br /> Stockton, California <br /> Incident#98996184 <br /> SAP 136144 <br /> Dear Mr Castelli <br /> On behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell), Cambria Environmental <br /> Technology, Inc (Cambria)presents this self-monitoring report for the referenced site Discussed <br /> below are the site background, a description of the treatment system, system sampling, system <br /> performance, and planned future activities <br /> SITE DESCRIPTION <br /> The subject site is located on the northeastern corner of the intersection of Country Club Boulevard <br /> and Plymouth Road in Stockton, California The site is an operating service station with a site layout <br /> that includes a service station building, an underground fuel storage tank (UST)complex located in <br /> the southwestern corner of the site, four dispenser islands, and a waste oil tank The location of the <br /> former UST complex is in the southeastern portion of the site <br /> GROUNDWATER EXTRACTION SYSTEM DESCRIPTION <br /> The groundwater extraction (GWE) system currently consists of one pneumatic submersible pump <br /> installed in well RW-1A, a transfer tank,transfer pump,flow totalizer meter,filter vessel, and three <br /> 1,200-1b aqueous-phase,granular activated carbon(GAC)vessels Groundwater is pumped from the <br /> Oakland, CA <br /> San Ramon CA well into the transfer tank When the tank is full, level switches activate the transfer pump, which <br /> Son o m a, CA pumps water through the filter vessels, and then through three carbon vessels(connected in series) <br /> Cambria A lower explosive limit(LEL)monitor, located above the sewer discharge point,is wired to the GWE <br /> Environmental system control panel such that the system will be automatically be shut down if the LEL meter reading <br /> Tedmolog ,Inc reaches or exceeds 10% A flow totalizer located downstream of the carbon vessels records the <br /> *Tkrnsy5tTeet <br /> volume of water being discharged into the City of Stockton sewer system The discharge is authorized <br /> P O Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />