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f <br /> DATE June 3, 2004 S E C ® IR <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 04 <br /> Primary Agency San Joaquin County Environmental Health Department(SJCEHD) <br /> WORK PERFORMED THIS QUARTER [First—2004] <br /> 1 Conducted groundwater monitoring and sampling of ten wells on March 29, 2004 <br /> 2 Performed periodic oxygen infection in wells SP-1 and SP-1A on January 7, January 23, February 4, <br /> February 19, March 5, March 22,And March 30, 2004 <br /> 3 Prepared quarterly groundwater sampling and remediation progress report <br /> WORK PROPOSED FOR NEXT QUARTER [Second—2004] <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 Resume periodic sod vapor extraction <br /> 4 Submit groundwater monitoring and sampling reduction request <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 third quarter of 1998 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 /> „Y <br /> Current Site Information <br /> Current Phase of Protect Groundwater Monitoring and Periodic <br /> Remediation < <br /> Frequency of Monitoring and Sampling Quarterly, Ten wells-MW-1 through MW- <br /> 7, MWAA, MW-4A, MW-5A t <br /> Are Liquid Phase Hydrocarbons Present On-site No <br /> Water Supply Wells within a 2,000-foot radius and their 65 wells within 2,000 feet in various <br /> Respective Direction directions <br /> Current Remediation Techniques Oxygen injection and sod vapor extraction <br /> Permits for Discharge San Joaquin Valley Air Pollution Control <br /> District Authority to Construct No N-4761- <br /> 1-0 <br /> Historic Range in Depth to Water, Q3-98 to Q1-04 MW-1, 14 17 to 22 15 feet bgs <br /> a <br /> fi <br /> 5 <br /> 3 <br /> 19976 04-1Q Report doc i <br /> k <br />