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S E C ® R <br /> DATE August 31 2006 <br /> Quarterly Groundwater Monitoring and Remediation Progress Report <br /> • Second Quarter 2006 <br /> Service Station Number 6100 <br /> Site Address 25775 South Patterson Pass Road, Sacramento, California <br /> Mr Don Pratt 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 06100 00 0336 <br /> Primary Agency/Contact San Joaquin County Environmental Health Department/ <br /> Mr Nuel Henderson <br /> WORK PERFORMED THIS QUARTER [Second --2006] <br /> 1 Stratus Environmental, Inc (Stratus) conducted quarterly groundwater monitoring and <br /> sampling on June 26, 2006 <br /> 2 Stratus prepared and submitted the Quarterly Summary Report— Fast Quarter 2006 on <br /> April 28, 2006 <br /> 3 Stratus performed routine operation and maintenance (O&M), collected permit <br /> compliance samples, and measured field parameters of the soil vapor extraction (SVE) <br /> system at the site <br /> . 4 Stratus performed well development on newly installed monitoring wells MW-16 through <br /> MW-20 <br /> WORK PROPOSED FOR NEXT QUARTER [Third—2006] <br /> 1 Stratus will perform quarterly groundwater monitoring and sampling <br /> 2 SECOR International Incorporated (SECOR) will prepare and submit the Quarterly <br /> Summary Report— Second Quarter 2006 <br /> 3 Stratus will continue to perform O&M, collect permit compliance samples, and measure <br /> field parameters of the SVE system <br /> 4 Stratus will submit the well installment report fot the newly installed wells <br /> DISCUSSION <br /> The site is currently an active 76-branded service station (formerly operated as ARCO Service <br /> Station No 6100) located approximately 700 feet west of the intersection of Patterson Pass <br /> Road and Interstate 580 in the city of Tracy, California Monitoring and sampling have been <br /> conducted at the site since February 2001 <br /> A site location map and site plan is 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 is included in Attachment B, a copy of the Well <br /> Development and Ground water Sampling Data Package is also included in Attachment B Field <br /> data sheets and certified laboratory analytical report, and chain-of-custody documentation for the <br /> quarterly sampling are included as Attachment C Remediation system field data sheets, chain- <br /> of-custody documentation, and waste management activities associated with the SVE system are <br /> presented in Attachment D Copies of the certified laboratory analytical reports and chain-of- <br /> IBP-ARC0104 BP Valley Portfoho161001ReportslQMRs16100 202006 doc SECOR Intemabonai incorporated <br />