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DATE December 22 2003 E C ® R <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> • Store Number 7-Eleven Store#14117 <br /> Site Address 2725 Country Club Boulevard, Stockton, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc -- Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 14117 03 0518 <br /> Primary Agency San Joaquin County Environmental Health Department(SJCEHD) <br /> WORK PERFORMED THIS QUARTER [Third—2003] <br /> 1 Conducted groundwater monitoring and sampling of seven wells on September 18, 2003 <br /> 2 Prepared quarterly groundwater sampling progress report <br /> 3 Installed one groundwater monitoring well (MW-8) <br /> WORK PROPOSED FOR NEXT QUARTER [Fourth—2003] <br /> 1 Perform quarterly groundwater sampling and prepare status report <br /> 2 Prepare assessment report summarizing the addition of one monitoring well and one sod boring for <br /> vertical plume delineation <br /> DISCUSSION <br /> The site is a 7-Eleven convenience store and gas station (Figures 1 and 2) Underground storage <br /> tanks (USTs) at the site were replaced in July 1998 Monitoring and sampling has been conducted at <br /> the site since the third quarter of 1999 The current groundwater monitoring and sampling data are <br /> summarized in Table 1 and presented in Figures 2 and 3 Historical groundwater monitoring and <br /> sampling results are summarized in Table 2 The well 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, Eight wells- MW-1 through <br /> MW-8 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000-foot radius and their 12 domestic wells in various directions <br /> Respective Direction Nearest is 400 feet north-northwest <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, 03-99 to Q3-03 MW-1, 6 75 to 10 15 feet bgs <br /> Current Quarter Monitoring Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Eight wells, MW-1 through MW-8 _ <br /> Dissolved Oxygen Readings Collected From Eight wells, MW-1 through MW-8 <br /> Approximate Depth to Groundwater(DTW) 7 90 to 10 61 ft b s <br /> Average Change to Groundwater Elevation Since Last <br /> Event 1 30 foot decrease <br /> Groundwater Flow Direction and Gradient Radially outward from MW-3 @ 0 02 foot <br /> per foot(Figure 2 <br /> 14117 03-3Q Report doc <br />