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DATE June 13, 2003 s E C ® R <br /> 7-ELEVEN, INC. QUARTERLY REPORT 4 H. <br /> Store Number 7-Eleven Store#17334 <br /> Site Address 4501 North Pershing Avenue, Stockton, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc —Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 17334 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 five wells on March 27, 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, Five wells- MW-2, MW-3, MW- <br /> 4, MW-5A, and MW-5B <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000 foot radius and their <br /> Respective Direction 1,500 feet upgradient (type unknowns <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, 04-97 to Q1-03 MW-2, 14 95 to 19 89 feet bgs <br /> Current Quarter Monitoring Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Five wells- MW-2, MW-3, MW-4, MW-5A, <br /> and MW-515 <br /> Dissolved Oxygen Readings Collected From Five wells- MW-2, MW-3, MW-4, MW-5A, <br /> and MW-5B <br /> Approximate Depth to Groundwater(DTW) 16 91 to 18 17 ft bgs <br /> Approximate Change in DTW Since Last Event 1 18 foot rise <br /> Groundwater Flow Direction and Gradient Northeast @ 0 004 foot per foot (Figure 2) <br /> 17334 03 10 Report <br />