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'i Date November 2, 2001 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 6080 Address 85 Louise Avenue, Lathrop, California <br /> ARCO Environmental Engineer Paul Supple <br /> Consulting Co/Contact Person Delta Environmental Consultants, Inc 1 Jay R Johnson <br /> Consultant Project No D000-339-2 <br /> Primary Agency/Regulatory ID No Lori Duncan, 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-3 and submitted for <br /> laboratory analysis <br /> 2 Delta compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2001) <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 Groundwater monitoring wells MW-1 <br /> through MW-3 will be purged and samples will be collected and analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, and total xylenes (BTEX) using <br /> U S Environmental Protection Agency(USEPA) Method 8015/8020 DHS LUFT and for methyl tertiary <br /> butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME), and 1,2-dichloroethane (1,2-DCA) using USEPA Method <br /> 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 24,2001 <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 9 58 to 10 40 feet bgs <br /> Groundwater Flow Direction East <br /> Groundwater Gradient 0 0006 ft/ft <br /> P 1ARC0160801Quarterly\200I1Arco_6080_3Q01 doc Delta <br />