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CANtBRIA <br /> 03 OCT IS Py 12' r October 8, 2003 <br /> I <br /> I <br /> Mr Richard Stiffler <br /> City of Stockton Department of Municipal Utilities <br /> Environmental Control Section <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> Re September 2003 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 Stiffler <br /> On behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell), Cambna Environmental <br /> Technology, Inc (Cambna)presents this self-monitoring report for the referenced site <br /> GROUNDWATER EXTRACTION SYSTEM DESCRIPTION <br /> Groundwater is extracted from well RWAA,usmg a pneumatic submersible pump,and treated by four <br /> granular activated carbon (GAC) vessels in series prior to discharge into the sanitary sewer The <br /> discharge is authorized under a City of Stockton wastewater discharge permit, originally issued on <br /> October 23, 2000 and revised on June 28, 2002 A detailed description of the subject site and <br /> groundwater extraction (GWE) system was included in Cambria's Groundwater Extraction System <br /> Installation Report dated July 27, 2001 <br /> MONTHLY COMPLIANCE ACTIVITIES <br /> Self-monitoring Sample Date September 10 and 23, 2003 <br /> Laboratory Analyses Total petroleum hydrocarbons as gasoline,benzene, toluene, ethylbenzene, <br /> xylenes, and methyl tertiary butyl ether(MTBE)are analyzed by EPA 8260, pH by EPA 150 1,and <br /> Cambna <br /> total petroleum hydrocarbons by EPA 1664 GWE system analytical data are summanzed in Table I <br /> Environmental Analytical Results Laboratory analytical results indicate that samples taken from our final discharge <br /> Technology,Inc <br /> point were below the permit specified discharge limits for all analyzed constituents Severn Trent <br /> *Hollis Street Laboratones, Inc extracted the pH sample collected on September 10, 2003 out of the EPA <br /> A <br /> Emeryville CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br /> V <br />