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yy F <br /> DATE May116 2003 S E C 0 R <br /> 7-ELEVEN INC. QUARTERLY �'r"'�ABrM HEAL,TIJ <br /> ' yt`IT ()ERIIICE <br /> • Store Number 7-Eleven Store#21756 <br /> D3MAY 2n AM 1I; 29 > <br /> Site Address 853 East Yosemite Avenue, Manteca, CA <br /> 7-Eleven Contact Mr Bob DeNinno <br /> Consulting Company SECOR International, Inc -Mr Jaff Auchterlonie <br /> f <br /> SECOR Project No 77EL 21756 03 0506 <br /> Primary Agency San Joaquin County Environmental Health Department (SJCEHD) <br /> 9 <br /> WORK PERFORMED THIS QUARTER [First-2003] <br /> 1 Conduct groundwater monitoring and sampling of three wells on March 10, 2003 <br /> 2 Prepare quarterly groundwater sampling and status report ` <br /> WORK PROPOSED FOR NEXT QUARTER [Second-2003] <br /> 1 Perform quarterly groundwater sampling and prepare status report <br /> DISCUSSION i <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 r <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- l <br /> 4 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> F' <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 Q1-03 MW-1, 16 54 to 22 33 feet bgs <br /> Current Quarter Monitoring Data (See Figure 2 and Table 1) ; <br /> a <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) 18 04 to 21 51 ft bgs_ <br /> Approximate Change in DTW Since Last Event 1 56 foot rise <br /> Groundwater Flow Direction and Gradient Northeast @ 0 002 foot per foot(Figure 2) <br /> Current Quarter Analytical Data (See Figure 3 and Table 1) <br /> Maximum TPHg Concentrations Not Detected, X50 ug/L - <br /> Maximum Benzene Concentrations Not Detected, <0 50 ug/L <br /> Y <br /> • Maximum MtBE Concentrations MW-1, 790 ug/L ^` <br /> Maximum TBA Concentrations Not Detected, <5 0 ug/L a <br /> iys <br /> `u <br /> 21756 03-10 Report <br /> ' 4 <br /> i <br />