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C A M B R I A <br /> 0 MAR i �, 200 <br /> March 13, 2003 <br /> LAVIROWE1VT HEALfH <br /> Mr Robert J Castelli PERM !!SERVICES <br /> Technical Services Supervisor <br /> c/o Mr Richard Stiff7er <br /> City of Stockton Department of Municipal Utilities <br /> I nvironmental Control Section <br /> 2500 Navy Drive <br /> Stockton, CA 95206-1191 <br /> Re February 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 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 <br /> GROUNDWATER EXTRACTION SYSTEM DESCRIPTION <br /> Groundwater is extracted from well RW-IA, using a pneumatic submersible pump, and treated by <br /> three 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) was included in Cambria's Groundwater Extraction System <br /> Installation Report dated July 27, 2001 <br /> Self-monitoring Sample Date- February 21, 2003 and February 25, 2003 <br /> Laboratory Analyses- Total petroleum hydrocarbons as gasoline,benzene,toluene, ethylbenzene, and <br /> xylenes(BTEX), and methyl tertiary butyl ether(MTBE)by EPA 8260,pH by EPA 150 1, and total <br /> petroleum hydrocarbons (TPH) by EPA 1664 GWE system analytical data are summarized in <br /> Table 1 <br /> Cambna <br /> Environmental <br /> Technology,Inc Analytical Results Laboratory analytical results indicate that samples taken from our final discharge <br /> 0 point were below the permit specified discharge limits for all analyzed constituents The laboratory <br /> Hollis Street <br /> A reports for the required samples taken on February 21, 2003 (BTEX and MTBE), and <br /> EmeTyville CA 94608 <br /> Tel(510)420-0700 <br /> Pax(510)420-9170 <br />