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DATE August 13, 2004 S ECOR <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> Store Number 7-Eleven Store#14117 <br /> Site Address 2725 Country Club Boulevard, Stockton, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc — Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 14117 04 <br /> Primary Agency San Joaquin County Environmental Health Department <br /> SJCEHD <br /> WORK PERFORMED THIS QUARTER [Second —2004] <br /> 1 Conducted groundwater monitoring and sampling of seven wells on June 9, 2004 <br /> 2 Prepared quarterly groundwater sampling progress report <br /> 3 Submit Work Plan for Interim Remediation and Oxygen Infection Feasibility Test dated <br /> April 19, 2004 to SJCEHD <br /> WORK PROPOSED FOR NEXT QUARTER [Third --2004] <br /> 1 Perform quarterly groundwater sampling and prepare status report <br /> 2 Submit Field Test Program for Evaluation of Oxidation Capacity of Groundwater dated <br /> July 22, 2004 to the RWQCB <br /> 3 Submit Work Plan for Additional Offsite Assessment dated July 27, 2004 to the SJCEHD <br /> The work plan proposes installation of two offsite groundwater monitoring wells, and <br /> advancing three offsite geoprobe soil borings and three CPT borings to further define the <br /> vertical and lateral limits of impacted soil and groundwater <br /> 4 With approval of the work plans, conduct the assessment and oxidation capacity testing <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 <br /> 3 Historical groundwater monitoring and sampling results are summarized in Table 2 The <br /> well 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 12 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 /> 14117 04-20 Report doc <br />