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S E C 0 R f DATE May 12, 2004 7-ELEVEN, INC. QUARTERLY REPORT Store Number 7-Eleven Store#32262 Site Address 2360 West Grant Line Road, Tracy, CA 7-Eleven Contact Mr Ken Hilliard Consulting Company SECOR International, Inc —Mr JafFAuchterlonie SECOR Project No 77EL 32262 04 Primary Agency San Joaquin County Environmental Health Department (SJCEHD) WORK PERFORMED THIS QUARTER [First—20041 1 Conducted groundwater monitoring and sampling of sig,wells on January 14, 2004 2 Prepared quarterly groundwater sampling report 3 Submitted work plan for additional lateral and vertical delineation of dissolved methyl-tert-butyl ether (MtBE), and feasibility testing for interim remediation WORK PROPOSED FOR NEXT QUARTER [Second--2004] 1 Perform quarterly groundwater sampling and prepare report 2 Install monitoring wells and advance borings for additional lateral and vertical delineation of dissolved MtBE, and feasibility testing for interim remediation DISCUSSION The site is currently an operating 7-Eleven convenience store and gasoline station Two 10,000- gallon underground storage tanks (USTs) and one 15,000-gallon UST are located in the southeastern portion of the property (Figures 1 and 2) The current groundwater monitoring and • sampling data are summarized in Table 1, and presented on Figure 2 Historical groundwater monitoring and sampling results are summarized in Table 2 The well completion details are summarized in Table 3 Current Site Information Current Phase of Project Groundwater Monitoring Frequency of Monitoring and Sampling Quarterly, Six wells- MW-1 through MW-5 and MW-6D Are Liquid Phase Hydrocarbons Present On-site No Water Supply Wells within a 2,000-foot radius and their Respective Direction , None Current Remediation Techniques None Permits for Discharge None Historic Range in Depth to Water, 04-03 to Q1-04 MW-1, 8 76 to 9 24 feet bgs Current Quarter Monitoring Data (See Figure 2 and Table 1) Wells Monitored and Sampled Six wells- MW-1 through MW-5 and MW- 6D Dissolved Oxygen Readings Collected From Six wells- MW-1 through MW-5 and MW- 6D Approximate Depth to Groundwater(DTW) 6 44 to 8 77 ft bgs _ Average Change in Groundwater Elevation Since Last T • Event 0 56 foot increase Groundwater Flow Direction and Gradient Northwest @ 0.005 feet per foot(Figure 2) 32262 04-10 Report doc ;