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DATE August 12, 2005 S E C 0 R 7-ELEVEN, INC. QUARTERLY REPORT Store Number 7-Eleven Store#20632 Site Address 4627 Da Vinci Drive, Stockton, CA 7-Eleven Contact Mr Ken Hilliard Consulting Company SECOR International, Inc — Mr Jaff Auchterlonle SECOR Project No 77EL 20632 05 Primary Agency San Joaquin County Environmental Health Department SJCEHD WORK PERFORMED THIS QUARTER [Second —2005] 1 Conducted groundwater monitoring and sampling of six wells on June 8, 2005 2 Prepared quarterly groundwater sampling and status report 3 Submitted Offsite Assessment Report to SJCEHD WORK PROPOSED FOR NEXT QUARTER [Third —2005] 1 Perform quarterly groundwater sampling and prepare status report DISCUSSION An active 7-Eleven convenience store and gasoline station is operated at the site (Figures 1 and 2) Monitoring and sampling have been conducted at the site since the fourth quarter of 1997 The current groundwater monitoring and sampling data are summarized In Table 1, and presented in Figures 2 and 3 Historical groundwater monitoring and sampling results are summarized in Table 2 The well completion details are summarized In Table 3 Current Site Information Current Phase of Project Groundwater Monitoring Frequency of Monitoring and Sampling Quarterly, Seven wells- MW-1, MW-2, MW-3, MW-4R, MW-5, MW-6, MW-7 Are Liquid Phase Hydrocarbons Present On-site No Water Supply Wells within a 2,000-foot radius and their Respective Direction None Current Remediation Techniques None Permits for Discharge None Historic Range In Depth to Water, Q4-97 to Q2-05 3 40 to 7 68 feet bgs Current Quarter Monitorin Data (See Figure 2 and Table 1) Wells Monitored and Sampled Six wells, MW-2, MW-3, MW-4R, MW- 5, MW-6, MW-7 Dissolved Oxygen Concentrations Measured In Six wells, MW-2, MW-3, MW-4R, MW- D, MW-6, MW-7 Approximate Depth to Groundwater (DTW) �6 73 to 7 68 ft bgs • Average Change in Groundwater Elevation Since Last Event 1 25 foot decrease 20632 05-2Q Reporl doc