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r <br /> DATE July 28, 2003 l`f�t��"ilr4�.th EA!_7�i <br /> 7-ELEVEN, INC QUARTERLY REPORT <br /> • <br /> Store Number 7-Eleven Store#21756 03 JUL 29 PM 12= 52 { <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 03 0506 <br /> Primary Agency San Joaquin County Environmental Health Department(SJCEHD) <br /> WORK PERFORMED THIS QUARTER[Second—2003] <br /> 1 Conduct groundwater monitoring and sampling of four wells on April 17, 2003 <br /> 2 Prepare quarterly groundwater sampling and status report <br /> WORK PROPOSED FOR NEXT QUARTER [Third—20031 <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 x <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 a <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 /> s <br /> Frequency of Monitoring and Sampling Quarterly, Four wells- MW-1 through MW- <br /> F <br /> Are Liquid Phase Hydrocarbons Present On-site No <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 02-03 MW-1, 16 54 to 22 33 feet bgs <br /> Current Quarter Monitorin 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, MWA through MW-4 <br /> Approximate Depth to Groundwater(DTW) 17 74 to 21 13 ft b s <br /> Approximate Change in DTW Since Last Event 0 35 foot rise <br /> a <br /> Groundwater Flow Direction and Gradient Northwest @ 0 002 foot per foot(Figure 2) <br /> Current Quarter Analytical Data (See Figure 3 and Table 1) <br /> Maximum TPHg Concentrations Not Detected, <50 to <200 u IL <br /> • Maximum Benzene Concentrations ^Not Detected, <0 50 to <2 0 g/L _ <br /> Maximum MtBE Concentrations MW-1, 720 ug/L <br /> Maximum TBA Concentrations Not Detected, <5 0 to <20 ug/L. <br /> r <br /> 21756 03-2Q Report doc <br />