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.� PATE August 18, 2004 S E C ® R <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> • Store Number 7-Eleven Store #32262 <br /> Site Address 2360 West Grant Line Road, Tracy, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc — Mr JaffAuchterlonie <br /> SECOR Project No 77EL 32262 04 <br /> Primary Agency San Joaquin County Environmental Health Department <br /> (SJCEHD) <br /> WORK PERFORMED THIS QUARTER [Second —2004] <br /> 1 Conducted groundwater monitoring and sampling of six wells on April 26, 2004 <br /> 2 Grab sample from tank pit well (TP-1) on April 26, 2004 <br /> 3 Prepared quarterly groundwater sampling report <br /> WORK PROPOSED FOR NEXT QUARTER [Third —2004] <br /> 1 Perform quarterly groundwater sampling and prepare report <br /> 2 Install two cone penetrometer test (CPT) borings, three groundwater monitoring wells, one <br /> oxygen infection well, and one groundwater extraction well for additional lateral and vertical <br /> delineation of dissolved MtBE, and feasibility testing for interim remediation <br /> 3 Conduct oxygen infection test and groundwater extraction feasibility test <br /> DISCUSSION <br /> • The site is currently an operating 7-Eleven convenience store and gasoline station Two <br /> 10,000-gallon underground storage tanks (USTs) and one 15,000-gallon UST are located in <br /> the southeastern portion of the property (Figures 1 and 2) The current groundwater <br /> monitoring and sampling data are summarized in Table 1, and presented on Figure 2 <br /> Historical groundwater monitoring and sampling results are summarized in Table 2 The <br /> 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, Six wells- MW-1 through <br /> MW-5 and MW-61D <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000-foot radius and <br /> their Respective Direction None <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, Q4-03 to Q2-04 MW-1, 8 76 to 9 24 feet bgs <br /> Current Quarter Monitorinca Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Seven wells- MW-1 through MW-5, <br /> • MW-6D, and TP-1 <br /> Dissolved Oxygen Concentrations Measured In Six wells- MW-1 through MW-5 and <br /> 32262 04-2Q Report doc <br />