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Date October 29, 2004 <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, R G <br /> Consultant Project No U5469-14-4 <br /> Primary Agency/Regulatory ID No Nuel Henderson, R G /San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER(Third 2004) <br /> 1 Stratus monitored groundwater elevations and collected quarterly groundwater samples from <br /> monitoring wells MW-1 through MW-10 (Figure 2) on September 14, 2004 <br /> 2 Stratus technician(s) visited the site five times (between July 7, 2004 and September 14, 2004) to <br /> conduct operation and maintenance of the ozone injection 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 2004) <br /> • 1 Quarterly groundwater monitoring and sampling will continue at the site The next sampling event is <br /> tentatively scheduled for December 2004 <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 (DIPE), 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 will operate and maintain the ozone injection system The ozone injection monitoring plan has <br /> been revised to collect field parameters on a monthly basis In addition to the quarterly sampling, <br /> additional groundwater samples will be collected from MW-1, MW-4 through MW-10 on a quarterly <br /> basis and analyzed for chemical oxygen demand (COD) using USEPA Method 410 4, total iron using <br /> EPA Method 200 7, and heterotrophic plate count using SM9215B <br /> Current Phase of Project Monitoring/Interim Remediation <br /> Frequency of Groundwater Sampling All Monitoring Wells= Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date September 14, 2004 <br /> Is Free Product(FP) Present on Site No <br /> FP Recovered This Quarter NIA <br /> Cumulative FP Recovered to Date NIA <br /> pproximate Depth to Groundwater 44 26 to 44 92 feet below around surface b s <br /> Groundwater Flow Direction East-northeast <br /> P IBp-Arco for URS\5469IQuaderly120041Arco_5469_3Q04 doc 5TKAW5 <br />