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� EC0R <br /> DATE April 26, 2004 <br /> • 7-ELEVEN, INC. QUARTERLY REPORT <br /> Store Number 7-Eleven Store#17334 <br /> A <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 Protect No 77EL 17334 04 ) <br /> Primary Agency San Joaquin County Environmental Health Department (SJCEHD) <br /> WORK PERFORMED THIS QUARTER [First—2004] <br /> 1 Conducted groundwater monitoring and sampling of five wells on February 13, 2004 <br /> 2 Prepared quarterly groundwater sampling report <br /> WORK PROPOSED FOR NEXT QUARTER [Second --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 Site Information <br /> Current Phase of Protect Groundwater Monitonn <br /> Frequency of Monitoring and Sampling Quarterly, Five wells- MW-2, MW-3, MW- <br /> 4, MW-5A, and MW-513 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> e <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 Q1-04 MW-2, 14 95 to 19 89 feet bgs I <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-5B s <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) 17 64 to 18 81 ft b s <br /> Average Change in Groundwater Elevation Since Last <br /> Event 1 15 foot increase <br /> Groundwater Flow Direction and Gradient Northeast @ 0 004 foot per foot(Figure 2) <br /> i <br /> 17334 04-10 Report doc <br />