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DATE October 23, 2003 S E C ® R <br /> 7-ELEVEN, INC. QUARTERLY 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 03 0506 <br /> Primary Agency San Joaquin County Environmental Health Department(SJCEHD) <br /> WORK PERFORMED THIS QUARTER [Third—2003] <br /> 1 Conduct groundwater monitoring and sampling of four wells on July 16, 2003 <br /> 2 Prepare quarterly groundwater sampling and status report <br /> WORK PROPOSED FOR NEXT QUARTER [Fourth—2003] <br /> 1 Perform quarterly groundwater sampling and prepare status report <br /> DISCUSSION <br /> An active 7-Eleven convenience store is operated at the site (Figures 1 and 2) Underground storage # <br /> tanks (USTs) were removed from the site in 1998 Monitoring and sampling has been conducted at <br /> the site since the first quarter of 2000 The current groundwater monitoring and sampling data are <br /> summarized in Table 1 and presented in Figures 2 and 3 Historical groundwater monitoring and <br /> sampling results are summarized in Table 2 The well 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 MW- <br /> 4 <br /> Are Liquid Phase Hydrocarbons Present On-site No s <br /> Water Supply Wells within a 2,000 foot radius and their <br /> Respective Direction One municipal well 2,000 feet southwest <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, Q1-00 to Q3-03 MW-1, 16 54 to 23 06 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 Readings Collected From Four wells, MW-1 through MW-4 <br /> Approximate Depth to Groundwater(DTW) 20 44 to 23 82 ft bgs _ <br /> Average Change in Groundwater Elevation Since Last <br /> Event 2 68 foot decrease <br /> Groundwater Flow Direction and Gradient Northwest @ 0 002 foot per foot(Figure 2 <br /> s <br /> 21756 03-3Q Report doc <br />