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DATE May 13, 2003 S E C ® R 7-ELEVEN, INC. QUARTERLY REPORT 7iStore Number 7-Eleven Store#19976 Site Address 1399 North Main Street, Manteca,CA 7-Eleven Contact Mr Bob DeNinno Consulting Company SECOR International, Inc —Mr Jaff Auchterlorne SECOR Project No 77EL 19976 03 0518 Primary Agency San Joaquin County Environmental Health Department(SJCEHD) WORK PERFORMED THIS QUARTER [First—2003] 1 Conduct groundwater monitoring and sampling of ten wells on March 11, 2003 2 Perform mobile oxygen injection in wells SP-1 and SP-1A 3 Prepare quarterly groundwater sampling and remediation progress report WORK PROPOSED FOR NEXT QUARTER [Second—2003] 1 Perform quarterly groundwater sampling and prepare status report 2 Resume biweekly oxygen injection into wells SP-1 and SP-1A DISCUSSION An active 7-Eleven convenience store and gasoline station is operated at the site (Figures 1 and 2) Monitoring and sampling has been conducted at the site since the third quarter of 1998 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 and Periodic Remediation Frequency of Monitoring and Sampling Quarterly, Ten wells- MW-1 through MW- 7, MW-1 A, MW-4A, MW-5A Are Liquid Phase Hydrocarbons Present On-site No Water Supply Wells within a 2,000 foot radius and their 65 wells within 2,000 feet in various Respective Direction directions Current Remediation Techniques Oxygen injection and sod vapor extraction 6 Permits for Discharge San Joaquin Valley Air Pollution Control District Authority to Construct No N-4761- 1-0 ,r Historic Range in Depth to Water,Q3-98 to Q1-03 MW-1, 14 17 to 21 12 feet bgs d� 1 I • 19976 03-1 Q Report