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S E C 0 R <br /> DATE July 28, 2003 t'tSr11 t^�;! '^�IT_rii f{FAf- ti <br /> • 7-ELEVEN, INC. QUARTERLY REI 66 <br /> Store Number 7-Eleven Store#17647 03 JUL 29 PM 12= 52 <br /> Site Address 1048 West 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 17647 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 three wells on April 17, 2003 <br /> 2 Prepare quarterly groundwater sampling and status report <br /> WORK PROPOSED FOR NEXT QUARTER [Third—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) The underground <br /> storage tanks (USTs) have been removed from the site Monitoring and sampling has been conducted <br /> at 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, Three wells- MW-1 through <br /> MW-3 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000 foot radius and their <br /> Respective Direction Municipal well 1,000 feet north <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, Q1-00 to Q2-03 MW-1, 12 90 to 17 26 feet bgs <br /> Current Quarter Mondonng Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Three wells, MW-1 through MW-3 <br /> Dissolved Oxygen Readings Collected From Three wells, MW-1 through MW-3 <br /> Approximate Depth to Groundwater(DTW) 15 06 to 15 75 ft bgs <br /> Approximate Change in DTW Since Last Event 0 30 foot decline <br /> Groundwater Flow Direction and Gradient East @ 0 002 footper foot(Fi2 ure 2) <br /> Current Quarter Analytical Data (See Figure 3 and Table 1) <br /> Maximum TPHg Concentrations Not Detected, <50 ug/L _ <br /> Maximum Benzene Concentrations Not Detected, <0 50 ug/L� _ <br /> Maximum MtBE Concentrations _MW-3, 0 56 ug/L <br /> Maximum TBA Concentrations Not Detected, <5 0 ug/L <br /> 17647 03-2Q Report doc <br />