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M <br /> CAMBRIA <br /> February 11,2003 <br /> Mr Robert J Castelh <br /> Technical Services Supervisor <br /> c/o 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- January 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), Cambia 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 Cambna's Groundwater Extraction System <br /> Installation Report dated July 27,2001 <br /> Self-monitoring Sample Date: January 24,2003 <br /> Laboratory Analyses: Total petroleum hydrocarbons as gasoline,benzene, toluene, ethylbenzene, <br /> Oakland, C A xylenes, and methyl tertiary butyl ether by EPA 8260, pH by EPA 150 1, and total petroleum <br /> San Ramon, CA hydrocarbons by EPA 1664 GWE system analytical data are summarized in Table 1 <br /> Sonoma, CA <br /> Cambna Analytical Results: Laboratory analytical results indicate that samples taken from our final discharge <br /> Envi'"O1""'erftF point were below the permit specified discharge limits for all analyzed constituents The laboratory <br /> Tethrlplogy,hit <br /> report for the required samples taken on January 24,2003 is presented in Appendix A <br /> WkinsStreel <br /> P 0 Box 259 <br /> Sonoma CA 95.476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />