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DATE April 18, 2005 S E C ® R 7-ELEVEN, INC QUARTERLY REPORT Store Number 7-Eleven Store#17334 Site Address 4501 North Pershing Avenue, Stockton, CA 7-Eleven Contact Mr Ken Hilliard Consulting Company SECOR International, Inc —Mr Jaff Auchterlonie SECOR Project No 77EL 17334 05 Primary Agency San Joaquin County Environmental Health Department (SJCEHD) _ WORK PERFORMED THIS QUARTER [First—2005] 1 Conducted groundwater monitoring and sampling on February 25, 2005 2 Prepared quarterly groundwater monitoring and sampling report WORK PROPOSED FOR NEXT QUARTER [Second —2005] 1 Perform quarterly groundwater sampling 2 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 has 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, Five wells- MW-2, MW-3, MW-4, MW-5A, and MW-513 Are Liquid Phase Hydrocarbons Present On-site No Water Supply Wells within a 2,000-foot radius and their Respective Direction 1,500 feet upgradient (type unknown) Current Remediation Techniques None Permits for Discharge None Historic Range in Depth to Water, Q4-97 to Q1-05 MW-2, 14 95 to 20 43 feet bgs Current Quarter Monitoring Data (See Figure 2 and Table 1) Wells Monitored and Sampled Five wells- MW-2, MW-3, MW-4, MW- 5A, and MW-513 Dissolved Oxygen Concentrations Measured In Five wells- MW-2, MW-3, MW-4, MW- 5A, and MW-513 Depth to Groundwater (DTW) 17 27 to 18 35 ft bgs - Average Change in Groundwater Elevation Since Last Event 1 55 foot increase 17334 05-1 Q Report doc