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DATE June 13 2003 <br /> . 7-ELEVEN, INC QUARTERLY REPORT <br /> Store Number 7-Eleven Store#20632 <br /> Site Address 4627 Da Vinci Drive, Stockton, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc —Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 20632 03 0506 <br /> Primary Agency San Joaquin County Environmental Health Department (SJCEHD) <br /> WORK PERFORMED THIS QUARTER [First—2003] <br /> 1 Conduct groundwater monitoring and sampling of seven wells on March 26, 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 <br /> An active 7-Eleven convenience store and gasoline station is operated at the site (Figures 1 and 2) <br /> Monitoring and sampling has been conducted at the site since the fourth quarter of 1997 The current <br /> groundwater monitoring and sampling data are summarized in Table 1 and presented in Figures 2 and <br /> 3 Historical groundwater monitoring and sampling results are summarized in Table 2 The well <br /> 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, Seven wells- MW-1, MW-2, <br /> MW-3, MW-4R, MW-5, MW-6, MW-7 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000 foot radius and their <br /> Respective Direction None <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, 04-97 to Q1-03 MW-1, 4 13 to 7 13 feet bgs <br /> Current Quarter Monitoring Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Seven wells, MW-1, MW-2, MW-3, MW- <br /> 4R, MW-5, MW-6, MW-7 <br /> Dissolved Oxygen Readings Collected From Seven wells, MW-1, MW-2, MW-3, MW- <br /> 4R, MW-5, MW-6, MW-7 <br /> Approximate Depth to Groundwater(DTW) 5 84 to 7 18 ft bgs <br /> Approximate Change in DTW Since Last Event 0 77 foot rise <br /> Groundwater Flow Direction and Gradient Southwest @ 0 004 foot per foot (Figure <br /> 2) <br /> 20632 03-10 Report <br />