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DATE April 13 2004 S E C ® IR <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 Protect No 77EL 21756 04 <br /> Primary Agency San Joaquin County Environmental Health Department(SJCEHD) <br /> WORK PERFORMED THIS QUARTER [First— 2004] <br /> 1 Conducted groundwater monitoring and sampling of four wells on January 13, 2004 <br /> 2 Prepared quarterly groundwater sampling report <br /> WORK PROPOSED FOR NEXT QUARTER [Second —2004] <br /> 1 Perform quarterly groundwater sampling and prepare 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 /> J <br /> Current Site Information r <br /> Current Phase of Protect Groundwater Monitoring <br /> Frequency of Monitoring and Sampling Quarterly, Four wells- MW-1 through MW- <br /> 4 (Effective 2Q04 Quarterly, Two wells — ` <br /> MW-1 and MW-2, Annual, Two wells — M <br /> MW-2 and MW-3) <br /> Are Liquid Phase Hydrocarbons Present On-site No , <br /> Water Supply Wells within a 2,000-foot radius and their <br /> t <br /> Respective Direction One municipal well 2,000 feet southwest <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> ,N <br /> Historic Range in Depth to Water, Q1-00 to Q1-04 MWA, 16 54 to 23 54 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 21 to 23 54 ft bgs <br /> Average Change in Groundwater Elevation Since Last <br /> Event 131 foot increase <br /> Groundwater Flow Direction and Gradient Northwest @ 0 002 foot per foot(Figure 2) `r <br /> ,t <br /> Y� <br /> n� <br /> A <br /> 2175604-1Q Report doe at <br /> L� <br />