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• MAY 0 2 2003 <br /> lVil 30, 2003 <br /> PERMIT�SERVICES <br /> ARCO QUARTERLY GROUNDWATER MONITORING RE ORT <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(First 2003): <br /> 1. Stratus monitored groundwater elevations and collected quarterly groundwater samples from <br /> monitoring wells MW-1 through MW-10 (Figure 2) on February 26, 2003. In addition to quarterly <br /> sampling, additional groundwater samples were collected periodically during first quarter 2003 as per <br /> ozone injection monitoring plan. <br /> 2. Stratus complied and evaluated groundwater monitoring data. <br /> 3. Stratus visited the site eleven times (between January 09, 2003 and March 17, 2003) to collect field <br /> and laboratory parameters identified in the monitoring plan of operation of ozone injection system to <br /> evaluate and optimize the performance of the C-SpargeTM system. <br /> 4. Stratus submitted a Well Installation and Site Investigation Report(dated February 26, 2003). <br /> WORK PROPOSED FOR NEXT QUARTER(Second 2003): <br /> 1. Quarterly groundwater monitoring and sampling will continue at the site. The next sampling event is <br /> tentatively scheduled for June 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 (D1PE), <br /> ethyl tertiary butyl ether (ETRE), tertiary amyl methyl ether (TAME), 1,2-Dichloroethane (1,2-DCA), <br /> and ethanol using USEPA Method 82606. <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, oxidation reduction <br /> potential (ORP) using American Standard Testing Method (ASTM) 01498-76, 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/interim Remediation <br /> ® Frequency of Groundwater Sampling: All Monitoring Wells =Quarterly <br /> PA3p-Arco for URS\54691Quartcrly\20031Arco_5469_1Q03.doc 5-rkATU5 <br />