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• Date November 2, 2001 <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: Delta Environmental Consultants, Inc. l Jay R. Johnson <br /> Consultant Project No: D000-336-3 <br /> Primary Agency/Regulatory ID No: Mar aret La orio, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 2001): <br /> 1. Groundwater samples were collected from monitoring wells MW-1 through MW-10 and submitted for <br /> laboratory analysis. <br /> 2. Delta compiled and evaluated groundwater monitoring data. <br /> 3. Delta submitted a well installation report (August 17, 2001) summarizing well installation activities and <br /> sampling of groundwater monitoring wells. This report also included results of a search for water <br /> production wells within a 2,000 feet radius around the site. <br /> WORK PROPOSED FOR NEXT QUARTER(Fourth 2001): <br /> i <br /> 1. Delta will continue to perform routine quarterly groundwater monitoring on behalf of ARCO. The next <br /> sampling event is tentatively scheduled for December 2001. <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-Dichloroethane (1,2-DCA), and ethylene dibromide (EDB) using USEPA <br /> Method 8260. <br /> Current Phase of Project: Monitoring <br /> Frequency of Groundwater Sampling: All Monitoring_Wells= Quarterly _ <br /> Frequency of Groundwater Monitoring: Quarter) <br /> Sampling Date: _September 14,2001 <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: 38.78 to 39.67 feet bgs <br /> Groundwater Flow Direction: Northeast <br /> Groundwater Gradient: 0.0026 ft/ft <br /> P:1ARCO 54091Quarterly120011Arco_5469_3Q01.doc Delta <br /> i <br />