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i <br /> S E C 0 R <br /> DATE: April 12, 2006 <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> Store Number: 7-Eleven Store#20632 <br /> Site Address: 4627 Da Vinci Drive, Stockton, CA <br /> 7-Eleven Contact: Mr. Ken Hilliard <br /> Consulting Company: SECOR International, Inc. — Mr. Jaff Auchterlonie <br /> SECOR Project No.: 77EL.20632.06 <br /> Primary Agency: San Joaquin County Environmental Health Department <br /> SJCEHD <br /> WORK PERFORMED THIS QUARTER [First—20061 <br /> 1. Conducted groundwater monitoring and sampling of seven wells on January 16, 2006. <br /> 2. Prepared quarterly groundwater sampling and status report. <br /> WORK PROPOSED FOR NEXT QUARTER [Second—2006] <br /> 1. Perform quarterly groundwater sampling and prepare status report. <br /> DISCUSSION <br /> An active 7-Eleven convenience store and gasoline station are operated at the site (Figures 1 <br /> and 2). Monitoring and sampling have 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, Seven wells- MW-1, MW-2, <br /> MW-3, MW-4R, MW-5, MW-6, MW-7 <br /> Are Liquid Phase Hydrocarbons Present On-site: No <br /> Water Supply Wells within a 2,000-foot radius and <br /> their Respective Direction: None <br /> Current Remediation Techniques: None <br /> Permits for Discharge: None <br /> Historic Range in Depth to Water, Q4-97 to Q4-05 MW-1, 3.40 to 7.13 feet bgs <br /> Current Quarter Monitoring Data See Figure 2 and Table 1 <br /> Wells Monitored and Sampled: Seven wells, MW-1, MW-2, MW-3, <br /> MW-4R, MW-5, MW-6, MW-7 <br /> Dissolved Oxygen Concentrations Measured In: Seven wells, MW-1, MW-2, MW-3, <br /> MW-4R, MW-5, MW-6, MW-7 <br /> Depth to Groundwater (DTW) (Measured Below <br /> Top of Casing) 4.96 to 6.03 ft <br /> Average Change in Groundwater Elevation Since <br /> Last Event: 1.75 foot increase <br /> 20632 06-1Q Report.doc SECOR International Incorporated <br />