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DATE April 4, 2006 <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> • Store Number 7-Eleven Store#17334 <br /> Site Address 4501 North Pershing Avenue, Stockton, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc — Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 17334 06 <br /> Primary Agency San Joaquin County Environmental Health Department <br /> SJCEHD <br /> WORK PERFORMED THIS QUARTER [First—2006] <br /> 1 Conducted groundwater monitoring and sampling of five wells on January 17, 2006 <br /> 2 Prepared quarterly groundwater monitoring and sampling report <br /> WORK PROPOSED FOR NEXT QUARTER [Second —2006] <br /> 1 Perform quarterly groundwater sampling <br /> 2 Prepare status report <br /> DISCUSSION <br /> An active 7-Eleven convenience store and gasoline station is operated at the site (Figures 1 <br /> and 2) Monitoring and sampling has been conducted at the site since the fourth quarter of <br /> 1997 The current groundwater monitoring and sampling data are summarized in Table 1, <br /> and presented in Figures 2 and 3 Historical groundwater monitoring and sampling results <br /> are summarized in Table 2 The well completion details are summarized in Table 3 <br /> Current Site Information <br /> Current Phase of Project Groundwater Monitoring <br /> Frequency of Monitoring and Sampling Quarterly, Five wells- MW-2, MW-3, <br /> MW-4, MW-5A, and MW-56 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000-foot radius and <br /> their Respective Direction 1,500 feet upgradient (type unknown) <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, Q4-97 to Q4-05 MW-2, 14 95 to 20 43 feet bgs <br /> Current Quarter Monitoring Data See Figure 2 and Table 1 <br /> Wells Monitored and Sampled Five wells- MW-2, MW-3, MW-4, MW- <br /> 5A, and MW-513 <br /> Dissolved Oxygen Concentrations Measured In Five wells- MW-2, MW-3, MW-4, MW- <br /> 5A, and MW-5B <br /> Depth to Groundwater (DTW) (Measured Below <br /> Top of Casing) 16 55 to 17 58 ft <br /> Average Change in Groundwater Elevation Since <br /> Last Event 2 15 foot increase <br /> 17334 06-10 Report doc SECOR International Incorporated <br />