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CAMBRIA <br /> June 13, 2005 <br /> Mr Richard Stiffler <br /> City of Stockton Department of Municipal Utiliti \',i'lt} <br /> Environmental Control Section <br /> 2500 Navy Drive <br /> Stockton, California 95206-1191 <br /> Re May 2005 Self-Monitoring Report <br /> Former Shell Service Station <br /> 2575 Country Club Boulevard <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), Cambria Environmental <br /> Technology, Inc (Cambria)presents this self-monitoring report for the referenced site <br /> GROUNDWATER EXTRACTION SYSTEM DESCRIPTION <br /> i <br /> Groundwater is extracted from well RW-IA,using 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 The City of Stockton issued a revised self-monitoring <br /> sample program in a letter dated October 10, 2003 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 /> Self-monrtonng Sample Date• May 16, 2005 <br /> Laboratory Analyses Total petroleum hydrocarbons as gasoline,benzene,toluene,ethylbenzene,and <br /> xylenes (BTEX),methyl tertiary butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl tertiary butyl <br /> ether(ETBE),tert-amyl methyl ether(TAME)and tertbutyl alcohol(TBA)by EPA 8260B,total toxic <br /> organics by EPA 624 and 625, pH by EPA 150 1, total petroleum hydrocarbons (TPH) by EPA <br /> 1664A,and Metals by EPA 200 7 GWE system effluent analytical data are summarized in Table 1 <br /> Cambria <br /> Enverental Analytical Results Laboratory analytical results indicate that samples taken from our final discharge <br /> Technology, <br /> point were below the permit specified discharge limits for all analyzed constituents The certified <br /> 0.1kins Street <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />