ARCHIVED REPORTS XR0003313 - Laserfiche WebLink

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DATE October 28, 2004 S E C 0 R 7-ELEVEN, INC. QUARTERLY REPORT • Store Number 7-Eleven Store#20632 Site Address 4627 Da Vinci Drive, Stockton, CA 7-Eleven Contact Mr Ken Hilliard Consulting Company SECOR International, Inc — Mr Jaff Auchterlorne SECOR Project No 77EL 20632 04 Primary Agency San Joaquin County Environmental Health Department (SJCEHD) WORK PERFORMED THIS QUARTER [Third—2004] 1 Conducted groundwater monitoring and sampling of seven wells on July 8, 2004 2 Prepared quarterly groundwater sampling and status report 3 Submitted offsite assessment work plan WORK PROPOSED FOR NEXT QUARTER [Fourth — 2004] 1 Perform quarterly groundwater sampling and prepare status report 2 Obtain access agreement and perform offsite assessment DISCUSSION An active 7-Eleven convenience store and gasoline station is operated at the site (Figures 1 and 2) Monitoring and sampling have been conducted at the site since the fourth quarter of 1997 The current groundwater monitoring and sampling data are summarized in Table 1, • and presented in Figures 2 and 3 Historical groundwater monitoring and sampling results are summarized in Table 2 The well completion details are summarized in Table 3 Current Site Information Current Phase of Project Groundwater Monitoring Frequency of Monitoring and Sampling Quarterly, Seven wells- MW-1, MW-2, MW-3, MW-4R, MW-5, MW-6, MW-7 Are Liquid Phase Hydrocarbons Present On-site No Water Supply Wells within a 2,000-foot radius and their Respective Direction None Current Remediation Techniques None Permits for Discharge None Historic Range in Depth to Water, Q4-97 to Q3-04 MW-1, 4 13 to 7 13 feet bgs Current Quarter Monitoring Data (See Figure 2 and Table 1) Wells Monitored and Sampled Seven wells, MW-1, MW-2, MW-3, MW-4R, MW-5, MW-6, MW-7 Dissolved Oxygen Concentrations Measured In Seven wells, MW-1, MW-2, MW-3, MW-4R, MW-5, MW-6, MW-7 Approximate Depth to Groundwater (DTW) 6 33 to 7 69 ft bgs 20632 04-3Q Report doc