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�} Date August 1,2005 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 5469 Address 130 South Wilson Way, Stockton, California <br /> ARCO Environmental Engineer PaulSupple <br /> Consulting Co/Contact Person Stratus Environmental, Inc /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 <br /> Services 1 Site Code 0710 <br /> WORK PERFORMED THIS QUARTER(Second 2005) <br /> 1 Stratus monitored groundwater elevations and collected quarterly groundwater samples from <br /> monitonng wells MW-1 through MW-10 (Figure 2)on June 8, 2005 <br /> 2 Stratus technician(s) visited the site six times (between April 5, 2005 and June 29, 2005) to conduct <br /> 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(Third 2005) <br /> 1 Quarterly groundwater monitoring and sampling will continue at the site The next sampling event is <br /> tentatively scheduled for September 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 8260E <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, 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 /> 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 ,lune 8, 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 42 16 to 42 95 feet below ground surface b s <br /> K IBP-Arco for URS%5469IQuarterly120051Arco_5469_2Q05 docPage 2 of 6 5TKAW5 <br />