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i <br /> r <br /> DATE February 15, 2005 E C ® R <br /> �J <br /> 7-ELEVEN, INC. QUARTERLY REPORT ` <br /> fj� <br /> Store Number 7-Eleven Store#19976 <br /> Site Address 1399 North Main Street, Manteca, CA <br /> �f <br /> 7-Eleven Contact Mr Ken Hilliard <br /> Consulting Company SECOR International, Inc —Mr Jaff Auchterlonie ! <br /> SECOR Project No 77EL 19976 04 <br /> Primary Agency San Joaquin County Environmental Health Department <br /> SJCEHD <br /> WORK PERFORMED THIS QUARTER [Fourth —2004] <br /> 1 Conducted groundwater monitoring and sampling on December 10, 2004 ' <br /> 2 Performed periodic oxygen infection in wells SP-1 and SP-1A <br /> 3 Prepared quarterly groundwater sampling and remediation progress report <br /> 4 Conducted soil vapor extraction (SVE) test on November 23, 2004, using well MW-2 <br /> WORK PROPOSED FOR NEXT QUARTER [First—2005] <br /> 1 Perform quarterly groundwater sampling and prepare status report <br /> 2 Continue periodic oxygen infection into wells SP-1 and SP-1A <br /> 3 Continue periodic SVE from MW-2 <br /> DISCUSSION <br /> An active 7-Eleven convenience store and gasoline station is operated at the site (Figures 1 <br /> . and 2) Monitoring and sampling ha$'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, Eight wells- MW-1, MW-1A, <br /> MW-2, MW-3, MW-5, MW-5A, MW-6, <br /> and MW-7 Annually, Two wells— <br /> MW-4 and MW-4A <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, IT) ' <br /> Current Remediation Techniques Oxygen infection and soil vapor <br /> extraction <br /> Permits for Discharge San Joaquin Valley Air Pollution <br /> Control District Authority to Construct <br /> No N-4761-1-0 <br /> • Historic Range in Depth to Water, Q3-98 to Q4-04 MW-1, 14 17 to 23,418' feet bgs <br /> 19976 04-40 Report doc <br />