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1 mHECE U E <br /> C A M B R I A JUL 1 9 2005 <br /> ENVIRONMENT HEALTH <br /> PERNliTISERVICES <br /> July 15, 2005 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report-- Second Quarter 2005 <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> SAP Code 136186 <br /> Incident No 98996222 <br /> Dear Mr Knoll <br /> Cambna Environmental Technology, Inc (Cambna) 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 /> SECOND QUARTER 2005 ACTIVITIES <br /> Blaine Tech Services, Inc (Blaine) of San Jose, California gauged and sampled all site wells and <br /> prepared a summary table of field gauging and laboratory analytical data Cambna prepared a <br /> site vicinity/well survey map (Figure 1), and a groundwater contour/chemical concentration map <br /> (Figure 2) Groundwater elevation data from BF-1 appears to be anomalous and was not used <br /> this quarter for preparing the groundwater contour map Blaine's report, which includes the <br /> laboratory report, is included as Appendix A Sampling was coordinated with sampling activities <br /> conducted at the Chevron service station located at 3775 Tracy Boulevard Available <br /> groundwater monitoring data and analytical results for the Chevron station are included as <br /> Appendix B <br /> A correction was made to Blaine's Well Concentrations table for the methanol analysis <br /> performed during the fourth quarter of 2004 on water samples collected from wells MW-lA and <br /> BF-1 The lab reported the results in parts per million and this was not converted to parts per <br /> billion on the Blaine table The methanol data is accurately reported in Blaine's table included <br /> with this report <br /> Cambria <br /> Environmental <br /> IVnology,Inc <br /> 270 Perkins Street <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />