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S E C 0 R - - --- - -- <br /> DATE October 4, 2005 <br /> • 7-ELEVEN, INC. SEMI-ANNUAL REPORT <br /> Store Number 7-Eleven Store#21756 <br /> Site Address 853 East Yosemite Avenue, Manteca, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc — Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 21756 05 <br /> Primary Agency San Joaquin County Environmental Health Department <br /> (SJCEHD) <br /> WORK PERFORMED THIS PERIOD [Second and Third Quarters —2005] <br /> 1 Conducted groundwater monitoring and sampling of four wells on August 16, 2005 <br /> 2 Prepared semi-annual groundwater monitoring report <br /> WORK PROPOSED FOR NEXT PERIOD [Fourth Quarter 2005 and First Quarter 20061 <br /> 1 Prepare and submit site status report (monitoring and sampling semi-annually) <br /> DISCUSSION <br /> An active 7-Eleven convenience store is operated at the site (Figures 1 and 2) Underground <br /> storage tanks (USTs) were removed from the site in 1998 Monitoring and sampling has <br /> been conducted at the site since the first quarter of 2000 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 <br /> Current Site Information <br /> Current Phase of Project Groundwater Monitoring <br /> Frequency of Monitoring and Sampling Semi-annually, Four wells- MW-1 <br /> through MW-4 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000-foot radius and <br /> their Respective Direction One municipal well 2,000 feet <br /> southwest <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, Q1-00 to Q3-05 MW-1, 16 54 to 23 95 feet bgs <br /> Current Quarter Monitoring Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Four wells- MW-1 through MW-4 <br /> Dissolved Oxygen Concentration Measured In Four wells- MW-1 through MW-4 <br /> Depth to Groundwater (DTW) 18 73 to 22 11 ft bgs <br /> Average Change in Groundwater Elevation Since <br /> Last Event 0 94 foot decrease <br /> 21756 05-3Q Report doc SECOR Intematronal Incorporated <br />