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S ECOR �- <br /> DATE February_9,_2006 <br /> 7-ELEVEN, INC. QUARTERLY REPORT <br /> Store Number 7-Eleven Store#19976 <br /> Site Address 1399 North Main Street, Manteca, CA <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc — Mr Jaff Auchterlonie <br /> SECOR Project No 77EL 19976 05 <br /> Primary Agency San Joaquin County Environmental Health Department s <br /> (SJCEHD) <br /> WORK PERFORMED THIS QUARTER [Fourth — 2005] <br /> 1 Conducted groundwater monitoring and sampling on October 26, 2005 <br /> 2 Performed periodic oxygen injection in wells SP-1 and SP-1A <br /> 3 Prepared quarterly groundwater sampling and remediation progress report <br /> WORK PROPOSED FOR NEXT QUARTER [First—2006] <br /> 1 Perform quarterly groundwater sampling and prepare status report <br /> 2 Continue periodic oxygen injection into wells SP-1 and SP-1A <br /> 3 Install three additional oxygen injection wells and one additional monitoring well per <br /> approval of work plan from SJCEHD and submit report <br /> 4 Submit report of evaluation of oxidation capacity of groundwater to CRWQCB - <br /> DISCUSSION <br /> - An active 7-Eleven convenience store and gasoline station is operated at the site (Figures 1 <br /> and 2)J Monitoring and sampling has been conducted at the site since the third quarter of <br /> 1998 The current groundwater monitoring and sampling data are summarized in Table 1, <br /> and presented in Figures 2 and 3 ' Historical groundwater monitoring and sampling results <br /> 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 and Periodic <br /> Remediation <br /> Frequency of Monitoring and Sampling Quarterly, Nine wells- MW-1, MW-1A, <br /> MW-2, MW-3, MW-4A, MW-5, MW- <br /> 5A, MW-6, and MW-7 Semi-annual, <br /> One well —MW-4 <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000-foot radius and 68 wells within 2,000 feet in various <br /> their Respective Direction directions (Survey of Sensitive <br /> Receptors, April 12, 1999, ITS <br /> Current Remediation Techniques Oxygen injection and sod vapor <br /> extraction <br /> Permits for Discharge San Joaquin Valley Air Pollution <br /> Control District Permit to Operate No <br /> N-5013-1-0 <br /> Historic Range in Depth to Water, Q3-98 to Q4-05 MW-1, 14 17 to 25 51 feet bgs <br /> 19976 05-4Q Report doc SECOR Intemational Incorporated <br />