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1 <br /> DATE November 25, 2003 E C ® rR <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> Store Number 7-Eleven Store#17647 <br /> Site Address 1048 West Yosemite Avenue, Manteca, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc —Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 17647 03 0506 <br /> Primary Agency San Joaquin County Environmental Health Department(SJCEHD) <br /> WORK PERFORMED THIS QUARTER [Third—2003] <br /> 1 Conduct groundwater monitoring and sampling of three wells on July 16, 2003 <br /> 2 Prepare quarterly groundwater sampling and status report <br /> WORK PROPOSED FOR NEXT QUARTER [Fourth—2003] <br /> 1 Pending site closure concurrence with the Regional Water Quality Control Board (RWQCB), destroy <br /> monitoring wells MW-1 through MW-3 <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 first quarter of 2000 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 Project Groundwater Monitoring <br /> Frequency of Monitoring and Sampling Quarterly, Three wells- MW-1 through <br /> MW-3 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000 foot radius and their <br /> Respective Direction Municipal well 1,000 feet north <br /> Current Remediation Techniques None <br /> Permits for Discharge None <br /> Historic Range in Depth to Water, Q1-00 to Q2-03 MW-1, 12 90 to 18 88 feet bgs <br /> Current Quarter Monitoring Data (See Figure 2 and Table 1) <br /> Wells Monitored and Sampled Three wells, MW-1 through MW-3 <br /> Dissolved Oxygen Readings Collected From Three wells, MW-1 through MW-3 <br /> Approximate Depth to Groundwater(DTW) 18 59 to 18 88 ft bgs <br /> Average Change in Groundwater Elevation Since Last <br /> Event 3 42 foot decrease <br /> Groundwater Flow Direction and Gradient Southeast @ 0 009 foot per foot(Figure 2) <br /> 17647 03-3Q Report doc <br />