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i <br /> DATE October 28, 2004 S E C ® R <br /> 7-ELEVEN, INC QUARTERLY REPORT OCT 2 9 2004 <br /> i ENVIRONiMEN 1 HEALTH � <br /> Store Number 7-Eleven Store#21756 PERMIi1SFRVICES r <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 04 <br /> Primary Agency San Joaquin County Environmental Health Department , <br /> (SJCEHD) _ <br /> WORK PERFORMED THIS QUARTER [Third— 2004] <br /> 1 Conducted groundwater monitoring and sampling of four wells on September 3, 2004 H <br /> 2 Prepared quarterly groundwater sampling report <br /> WORK PROPOSED FOR NEXT QUARTER [Fourth —2004] r' <br /> 1 Prepare and submit site status report (monitoring and sampling reduced from quarterly to <br /> 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 Quarterly, Four wells- MW-1 through <br /> MW-4 (Effective 2Q04 Quarterly, Two <br /> wells— MW-1 and MW-2, Annual, Two <br /> wells— MW-2 and MW-3) <br /> Are Liquid Phase Hydrocarbons Present On-site No 'x <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 Q3-04 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 Three wells- MW-1, MW-3 & MW-4 <br /> (MW-2 Dry) <br /> Dissolved Oxygen Concentration Measured In Three wells- MW-1, MW-3 & MW-4 <br /> Mir - } <br /> 21756 04-3Q Report doc <br />