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C A M B R I A r FEB 2 5 2004 ENVIRONMENT HEALTH February 20, 2004 Mr Harlin Knoll PERMIT/SERVICES San Joaquin County Environmental Health Department 304 East Weber Avenue, Third Floor Stockton, California 95202 Re Groundwater Monitoring Report- Fourth Quarter 2003 Shell-branded Service Station 7700 Moreland Street Stockton, California SAP Code 136146 Incident No 97259207 SJCEHD Site Code 852 Dear Mr Knoll Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equilon Enterprises LLC dba Shell Oil Products US (Shell) in accordance with the quarterly reporting requirements of 23 CCR 2652d FOURTH QUARTER 2003 ACTIVITIES Blaine Tech Services, Inc (Blaine), of San Jose, California gauged and sampled all site wells and prepared a summary table of field gauging data and petroleum hydrocarbon and methyl tertiary butyl ether concentrations Cambria prepared a summary table of groundwater analytical data for oxygenates (Table 1), a site vicinity/receptor survey map (Figure 1), and a groundwater contour/chemical concentration map (Figure 2) Blaine's report,presenting the laboratory report, is included as Appendix A ANTICIPATED FIRST QUARTER 2004 ACTIVITIES Cambria received San Joaquin County Environmental Health Department's (SJCEHD's) July 14, 2003 letter approving our February 20, 2003 Site Investigation Work Plan Cambria is currently pursuing a San Joaquin County encroachment permit to install proposed well MW-7 Once Cambria receives this permit, we will schedule the drilling and notify SJCEHD r Cambna Blaine will gauge and sample all site wells and tabulate the data Cambria will prepare a Environmental groundwater monitoring report Technology,Inc F d Operkins Street P 0 Box 259 Sonoma CA 95476 u r Tel(707)935-4850 e Fax(707)935-6649 i r r