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Date April 29, 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 AgencylRegulatory ID No Nuel Henderson, P G 1 San Joaquin County Public Health <br /> Services 1 Site Code 0710 <br /> WORK PERFORMED THIS QUARTER(First 2005) <br /> 1 Stratus monitored groundwater elevations and collected quarterly groundwater samples from <br /> monitoring wells MW-1 through MW-10 (Figure 2) on March 16, 2005 <br /> 2 Stratus technician(s) visited the site seven times (between January 13, 2005 and March 31, 2005) 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(Second 2005) <br /> 1 Quarterly groundwater monitoring and sampling will continue at the site The next sampling event is <br /> tentatively scheduled for June 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 (DIPE), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and ethanol using USEPA <br /> Method 82608 <br /> 3 Stratus will continue to operate and maintain the ozone injection system In addition to the quarterly <br /> sampling, additional groundwater samples will be collected from MW-1, MW-4 through MW-10 on a <br /> 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 /> 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 March 16, 2005 <br /> Is Free Product(FP) Present on Site No <br /> FP Recovered This Quarter NIA <br /> Cumulative FP Recovered to Date NIA <br /> Approximate Depth to Groundwater 43 95 to 44 73 feet below ground surtace (bgs) <br /> K\BP-Arco for URS\5469\Quarter1y\2005\Areo_5469_1Q05 doe 3rRAW5 <br />