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. Date November 20, 2002 <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 <br /> Consultant Project No: U5469-04-3 <br /> Primary Agency/Regulatory ID No: Nuel Henderson /San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 2002): <br /> 1. Stratus collected groundwater samples from monitoring wells MW-1 through MW-10 and submitted <br /> them for laboratory analysis. <br /> 2. Groundwater monitoring data was compiled and evaluated. <br /> 3. Stratus continued to pursue access agreements for off-site monitoring wells. <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2002): <br /> 1. Quarterly groundwater monitoring and sampling will continue at the site. The next sampling event is <br /> tentatively scheduled for December 2002. <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, and total xylenes <br /> (BTEX) using USEPA Method 8015/8020 DHS LUFT, and for tertiary butyl alcohol (TBA), methyl <br /> tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl <br /> methyl ether (TAME), 1,2-Dichloroethene (1,2-DCA), and ethylene dibromide (EDB) using USEPA <br /> Method 82606. <br /> 3. Stratus will conduct the onsite CPT investigation as outlined in Delta's Work Plan for Additional Site <br /> Assessment and Interim Remediation/Feasibility Testing (dated March 4, 2002), and approved by <br /> SJCPHS. <br /> 4. Upon receipt of an access agreement for the proposed off-site monitoring wells, Stratus will install the <br /> wells as outlined in the approved work plan. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: _ All Monitory Wells =Quarterly <br /> Frequency of Groundwater Monitoring: Quarter) <br /> Sampling Date: September 19, 2002 <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: 41.78 to 42.49 feet b s <br /> Groundwater Flow Direction: Northeast <br /> Groundwater Gradient: 0.0021 ft/ft <br /> PABp-Arco for URS154691Quarterly120021Arco_5469-3Q02.doe 3TkAI V-9 <br />