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H <br /> • Date _ February 28, 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: Delta Environmental Consultants_ Inc./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 (Fourth 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 /> WORK PROPOSED FOR NEXT QUARTER (First 2002): <br /> 1. Delta will continue to perform routine quarterly groundwater monitoring on behalf of ARCO. The next <br /> sampling event is tentatively scheduled for February 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 LOFT, 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: Quarterly ~ <br /> Sampling Date: December 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: 39.90 to 40.80 feet b s _ <br /> Groundwater Flow Direction: Northeast <br /> Groundwater Gradient: 0.0022 ft/ft <br /> PAARC0154691Quarterly120011Arco_5469_4Q01.doc Delta <br />