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S E C 0 R <br /> DATE September 18, 2006 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report <br /> . Second Quarter 2006 <br /> Service Station Number 5469 <br /> Site Address 130 South Wilson Way, Stockton, California <br /> Mr Don Pratt <br /> Environmental Business Manager <br /> Client Contact Atlantic Richfield Company <br /> P O Box 1257 <br /> San Ramon, California 94583 <br /> Consulting Company SECOR International Incorporated — Mr Rusty Benkosky <br /> SECOR Project No 77BP 05469 00 0336 <br /> Primary Agency/Contact San Joaquin County Environmental Health Department (SJC- <br /> EHD)/ Mr Nuel Henderson <br /> WORK PERFORMED THIS QUARTER [Second —2006] <br /> 1 Stratus Environmental Inc (Stratus) conducted coordinated quarterly groundwater <br /> monitoring and sampling from monitoring wells MW-1 through MW-13 on May 30, 2006 <br /> 2 Stratus prepared and submitted the Quarterly Groundwater Monitoring Report — First <br /> Quarter 2006 on April 26, 2006 <br /> 3 Stratus performed routine operation and maintenance (O&M) and collected field <br /> parameters from the groundwater monitoring wells for the ozone sparge (OS) system <br /> WORK PROPOSED FOR NEXT QUARTER [Third —2006] <br /> 1 Stratus will perform coordinated quarterly groundwater monitoring and sampling <br /> 2 SECOR International Incorporated (SECOR) will prepare and submit the Quarterly <br /> Groundwater Monitoring and Remediation Progress Report—Second Quarter 2006 <br /> 3 Stratus will continue to perform O&M and collect field parameters from the groundwater <br /> monitoring wells for the OS system <br /> DISCUSSION <br /> The subject site is an active service station and convenience store located at the northeast <br /> corner, at the intersection of Wilson Way and Washington Street in Stockton, California The site <br /> dispenses gasoline from two pump islands situated in the southwestern corner of the property, <br /> and an underground storage tank (UST) complex situated in the west central portion of the <br /> property Motor vehicle fuels were also released to the subsurface at the Knowles-Roek <br /> property, situated immediately north of the site at 102 South Wilson Way, and at the former Top <br /> Filling Station, situated immediately northwest of the site at 101 South Wilson Way SJC-EHD is <br /> also directing environmental oversight cases relating to underground fuel releases at both of <br /> these properties <br /> A site location map and site plan are included as Figures 1 and 2, respectively The current and <br /> historical groundwater monitoring and sampling data are summarized in Figures 3 and 4 and in <br /> Tables 1 and 2 Previous investigation information and site history is included in Attachment A <br /> Stratus Groundwater Sampling Data Package are included in Attachment B Certified laboratory <br /> analytical report, and chain-of-custody documentation for the quarterly sampling are included as <br /> Attachment C Remediation system field data sheets, chain-of-custody documentation, and waste <br /> 11BP-ARM04 BP Valley Portfolio154691ReportslQMRs1200615469 2Q2006 doc SECOR International Incorporated <br />