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r . <br /> lip <br /> p: <br /> ember 4, 2003 <br /> Mr. Michael Infurna <br /> ` C- <br /> San Joaquin County Environmental Health Department N- <br /> 304 <br /> �v`— <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 ` <br /> Re: Groundwater Monitoring Report—Third Quarter 2003 <br /> Former Shell Service Station <br /> 1267 Country Club Boulevard <br /> Stockton, California <br /> SAP Code 129480 <br /> Incident No. 97093419 <br /> SJCEHD Site Code 505602 <br /> Dear Mr. Infurna: <br /> Cambria Environmental Technology, Inc. (Cambria) prepared this report on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly reporting <br /> requirements of 23 CCR 2652d. <br /> • �' : � �1Q 20013 AC7,"V' <br /> Blaine Tech Services, Inc. (Blaine) of San Jose, California gauged the site wells and sampled <br /> selected wells at the subject site. The quarterly sampling event was coordinated with the Tosco <br /> (former BP) station located at 1403 Country Club Boulevard. Blaine prepared a summary table <br /> of field gauging data and petroleum hydrocarbon concentrations for the Shell site. Cambria <br /> prepared a summary table of additional groundwater analytical data (Table 1) for the subject site, <br /> a site vicinity/well survey map (Figure 1), and a groundwater contour/chemical concentration <br /> map with data from the Shell site and the Tosco site (Figure 2). Blaine's report, presenting the <br /> laboratory report for the subject site, is included as Appendix A. The groundwater monitoring <br /> data and analytical results for the Tosca station are included in Appendix B. <br /> Oakland, CA The laboratory noted that the total petroleum hydrocarbons as diesel reported for wells S-1, S-2, <br /> San Ramon, CA and S-3 do not match the pattern of the laboratory's standard. Upon further review, the <br /> Sonoma, CA laboratory determined that the detections are due to hydrocarbons in the early diesel range, which <br /> cambria <br /> may be indicative of gasoline in the diesel range. The laboratory also noted that the total <br /> Environmental petroleum hydrocarbons as gasoline reported for well S-3 do not match the pattern of the <br /> Technology,Inc. laboratory's standard. According to the laboratory, this detection is due to the presence of aged <br /> Perkins Street gasoline. <br /> P.O.Box 259 <br /> Sonoma,CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />