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DATE February 7, 2006 <br /> 7-ELEVEN, INC. QUARTERLY REPORT ((v" <br /> Store Number 7-Eleven Store#14117 FEB 1 0 2006 <br /> MEN <br /> Site Address 2725 Country Club Boulevard, Stockton, , F I HE TIS <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc —Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 14117 05 <br /> Primary Agency San Joaquin County Environmental Health Department <br /> (SJCEHD) <br /> WORK PERFORMED THIS QUARTER [Fourth —2005] <br /> 1 Conducted groundwater monitoring and sampling of eight wells on December 9, 2005 <br /> 2 Prepared quarterly groundwater sampling progress report <br /> 3 Conducted oxidation capacity testing in well 1-1 <br /> WORK PROPOSED FOR NEXT QUARTER [First—2006] <br /> 1 Perform quarterly groundwater sampling and prepare status report <br /> 2 With approval of access agreement, install offsite groundwater monitoring well MW-9 <br /> 3 Submit report of oxidation capacity testing in well 1-1 <br /> DISCUSSION <br /> The site is a 7-Eleven convenience store and gas station (Figures 1 and 2) Underground <br /> storage tanks (USTs) at the site were replaced in July 1998 Monitoring and sampling has <br /> • been conducted at the site since the third quarter of 1999 The current groundwater <br /> monitoring and sampling data are summarized in Table 1, and presented in Figures 2 and 3 <br /> Historical groundwater monitoring and sampling results are summarized in Table 2 The well <br /> completion details are summarized in Table 3 An active USA Gasoline (former Exxon) <br /> service station is located east of the site <br /> Current Site Information <br /> Current Phase of Project Groundwater Monitoring <br /> Frequency of Monitoring and Sampling Quarterly, Eight wells - MW-1 through <br /> MW-8 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000-foot radius and 11 domestic wells in various <br /> their Respective Direction directions, nearest is 400 feet north- <br /> northwest <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, Q3-99 to Q4-05 MW-1, 6 69 to 10 15 feet bgs <br /> Current Quarter Monitoring Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Eight wells, MW-1 through MW-8 <br /> • Dissolved Oxygen Concentrations Measured In Eightwells,MW-1 through MW-8 <br /> 14117 05-4Q Report doc SECOR International Incorporated <br />