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1%00" s E C 0 R _ <br /> DATE: February 28, 2007 <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.14117.06 <br /> Primary Agency: San Joaquin County Environmental Health Department <br /> (SJCEHD) <br /> WORK PERFORMED THIS QUARTER [Fourth —2006] <br /> 1. Conducted groundwater monitoring and sampling of eight wells on December 1, 2006. <br /> 2. Prepared quarterly groundwater sampling progress report. <br /> WORK PROPOSED FOR NEXT QUARTER [First—2007] <br /> 1. Perform quarterly groundwater sampling and prepare status report. <br /> 2. With approval of access agreement, install offsite groundwater monitoring well MW-10. <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 Q4-06 MW-1, 6.28 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: Eight wells, MW-1 through MW-8 <br /> 14117 06AQ Report SECOR International Incorporated <br />