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�w <br /> Date October 28, 2005 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 5469 Address 130 South Wilson Way, Stockton, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person Stratus Environmental, Inc 1 Jay R Johnson, P G <br /> Consultant Project No U5469-14-4 <br /> Primary Agency/Regulatory ID No Nuel Henderson, P G , San Joaquin County Public Health Services/ <br /> 0710 <br /> WORK PERFORMED THIS QUARTER(Third 2005) <br /> 1 Stratus monitored groundwater elevations and collected quarterly groundwater samples from <br /> monitoring wells MW-1 through MW-10 (Figure 2) on September 8, 2005 <br /> 2 Stratus technician(s) visited the site eight times (between July 12, 2005 and September 30, 2005) to <br /> conduct operation and maintenance of the ozone infection system, and to collect field and laboratory <br /> parameters as identified in the monitoring plan for operation of the ozone injection system <br /> 3 Stratus complied and evaluated groundwater monitoring data <br /> • WORK PROPOSED FOR NEXT QUARTER(Fourth 2005) <br /> 1 Quarterly groundwater monitoring and sampling will be conducted jointly with the Knowles (102 S <br /> Wilson) and Top Filling (101 S Wilson) sites The next sampling event is scheduled for December 8, <br /> 2005 <br /> 2 Groundwater samples will be collected from monitoring wells MW-1 through MW-10 and analyzed for <br /> gasoline range organics (GRO), benzene, toluene, ethylbenzene, total xylenes (BTEX), tertiary butyl <br /> alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary butyl ether <br /> (ETRE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and ethanol using USEPA <br /> Method 8260B <br /> 3 Stratus wilt continue to operate and maintain the ozone infection system In addition to the quarterly <br /> sampling, additional groundwater samples will be collected from MW-1, and MW-4 through MW-10 on <br /> a quarterly basis and analyzed for chemical oxygen demand (COD) using USEPA Method 410 4, total <br /> iron using EPA Method 200 7, and heterotrophic plate count using SM9215B <br /> 4 Stratus will prepare and submit a Site Conceptual Model (SCM) for the subject site As requested by <br /> SJCEHD the SCM will include hydrogeologic and chemical analytical data from the Knowles and Top <br /> Filling sites <br /> Current Phase of Project Monitoring 1 Interim Remediation <br /> Frequency of Groundwater Sampling All Monitoring Wells = Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date September 8, 2005 <br /> t <br /> K 1Bp-Arco for URS154691Quarterly120051Arco_5469}QOS docAage 2 of 6 3rKAWO <br />