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AMBRIA <br /> 1 <br /> 4 May 5, 2005 <br /> Mr Richard Stiffler <br /> City of Stockton Department of Municipal Utilities <br /> Environmental Control Section <br /> 2500 Navy Drive <br /> Stockton, California 95206-1191 <br /> Re April 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 Stlffler <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 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 perms, 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 Cambna's Groundwater Extraction System <br /> Installation Report dated July 27, 2001 <br /> Self-monitoring Sample Date April 14, 2005 <br /> Laboratory Analyses Total petroleum hydrocarbons as gasoline,benzene,toluene,ethylbenzene,and <br /> xylenes (BTEX), methyl tertiary butyl ether(MTBE), di-isopropyl ether(DIPS), ethyl tertiary butyl <br /> ether(ETBE),tertiary-amyl methyl ether(TAME), and tertiary-butyl alcohol(TBA)by EPA 8260B, <br /> pH by EPA 150 1, and total petroleum hydrocarbons (TPH) by EPA 1664 GWE system effluent <br /> Cambria analytical data are summarized in Table 1 <br /> Environmental <br /> Technology,Inc <br /> Analytical Results Laboratory analytical results indicate that samples taken from our final discharge <br /> 00 Hollis Street point were below the permit specified discharge limits for all analyzed constituents The certified <br /> Suite A <br /> Emeryville CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />