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DATE June 3, 2004 E C ® [ld <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 Auchterlorne <br /> SECOR Project No 77EL 14117 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 eight wells on March 3, 2004 <br /> 2 Prepared quarterly groundwater sampling progress report <br /> WORK PROPOSED FOR NEXT QUARTER [Second —20041 <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 <br /> at the site since the third quarter of 1999 The current groundwater monitoring and sampling data <br /> are summarized in Table 1, and presented in Figures 2 and 3 Historical groundwater monitoring <br /> and sampling results are summarized in Table 2 The well completion details are summarized in <br /> • Table 3 An active USA Gasoline (former Exxon) service station is located east of the site <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, Q3-99 to Q1-04 MW-1, 6 69 to 10 15 feet bgs <br /> Current Quarter Monitoring Data wee 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, MWA through MW-8 <br /> Approximate Depth to Groundwater(DTW) 5 99 to 7 47 ft_bgs <br /> Average Change to Groundwater Elevation Since Last <br /> Event 2 31 foot increase <br /> Groundwater Flow Direction and Gradient Radially outward from MW-3 between <br /> 0 015 and 0 009 feet per foot(Figure 2 <br />� i <br /> 14117 04-1Q Report doc <br />