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• Date July 26, 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. /Ja 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 (Second 2004): <br /> 1. Stratus monitored groundwater elevations and collected quarterly groundwater samples from <br /> monitoring wells MW-1 through MW-10 (Figure 2)on June 8, 2004. <br /> 2. Stratus technician(s) visited the site five times (between April 5, 2004 and June 28, 2004) 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 2004): <br /> . 1. Quarterly groundwater monitoring and sampling will continue at the site. The next sampling event is <br /> tentatively scheduled for September 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 /> (ETBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and ethanol using USEPA <br /> Method 82606. <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 SM921513. <br /> 4. Stratus will gather necessary information from the two adjacent sites that are in the LOP and prepare <br /> a Site Conceptual Model (SCM). <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: June 8, 2004 <br /> Is Free Product(FP) Present on Site: No <br /> FP Recovered This Quarter: N/A <br /> . Cumulative FP Recovered to Date: NIA <br /> PABp-Arco for URS\5469\Quarteriy\2004\Arco_5469_2Q04.doc 5r;ZATU5 <br />