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DATE March 11, 2004 S EC C ® R <br /> 7-ELEVEN, INC. QUARTERLY REPORT <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 [Fourth—2003] <br /> 1 Conducted groundwater monitoring and sampling of five wells on December 5, 2003 <br /> 2 Prepared quarterly groundwater sampling and status report <br /> WORK PROPOSED FOR NEXT QUARTER [First—2004] <br /> 1 Perform quarterly groundwater sampling <br /> 2 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 Siete 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-58 <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 unknown) <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, Q4-97 to Q4-03 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-513 <br /> Dissolved Oxygen Readings Collected From Five wells- MW-2, MW-3, MW-4, MW-5A, <br /> and MW-513 <br /> Approximate Depth to Groundwater(DTW) —18 63 to 19 76 ft bgs <br /> Average Change in Groundwater Elevation Since Last <br /> Event 0 41 foot decease <br /> Groundwater Flow Direction and Gradient Northeast @_0 011 foot per foot(Figure 21 <br /> 17334 03-4Q Report <br />