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Date October 31, 2003 <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./Jay R. Johnson, R.G. <br /> Consultant Project No: U5469-14-4 <br /> Primary Agency/Regulatory ID No: Nuel Henderson, R.G. 1 San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER(Third 2003): <br /> 1. Stratus monitored groundwater elevations and collected quarterly groundwater samples from <br /> monitoring wells MW-1 through MW-10 (Figure 2) on September 9, 2003. In addition to quarterly <br /> sampling, additional groundwater samples were collected for parameters identified in the ozone <br /> injection monitoring plan. <br /> 2. Stratus technician(s) visited the site eight times (between June 23, 2003 and September 29, 2003) to <br /> troubleshoot the ozone injection system and to collect field and laboratory parameters as identified in <br /> 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 2003): <br /> 1. Quarterly groundwater monitoring and sampling will continue at the site. The next sampling event is <br /> tentatively scheduled for December 2003. <br /> 2. Groundwater samples will be collected from monitoring wells MW-1 through MW-10 and analyzed for <br /> total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX), tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl <br /> tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and <br /> ethanol using USEPA Method 8260B. <br /> 3. Stratus will operate and maintain the ozone injection system. Field and laboratory parameters <br /> identified in the ozone injection monitoring plan will be collected on a bi-monthly and quarterly basis, <br /> respectively. Groundwater samples will be collected from monitoring wells MW-1 through MW-10 and <br /> analyzed for chemical oxygen demand (COD) using USEPA Method 410.4, ferrous iron using Hach <br /> Method 8146, heterotrophic plate count using SM921513, nitrite, nitrates and sulfates using EPA <br /> Method 300.0, and Total Dissolved Solids (TDS) using USEPA Method 160.1. <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 9, 2003 <br /> Is Free Product (FP) Present on Site: No <br /> . FP Recovered This Quarter: NIA <br /> PABp-Arco for URW4691Quarterly120031Arco_5469_3Q03.doc 5TkATU5 <br />