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• Date April 29, 2002 <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 (First 2002) <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 (Second 2002) <br /> 1 Quarterly groundwater monitoring will continue at the site The next sampling event is tentatively <br /> scheduled for June 2002 Groundwater monitoring wells MW-1 through MW-3 will be purged and <br /> samples will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG), <br /> benzene, toluene, ethylbenzene, and total xylenes (BTEX) using U S Environmental Protection <br /> Agency (USEPA) Method 8015/8020 DHS LUFT, and for methyl tertiary butyl ether (MTBE), tertiary <br /> butyl alcohol (TBA), di-isopropyl ether (D1PE), ethyl tertiary butyl ether (ETRE), tertiary amyl methyl <br /> ether (TAME), and 1,2-dichloroethane (1,2-DCA) using USEPA Method 8260 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling All MonitoringWells= Quarterly <br /> Frequency of Groundwater Monitoring Quarter) <br /> Sampling Date March 18,2002 <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 8 14 to 8 94 feet bgs <br /> Groundwater Flow Direction East-northeast <br /> Groundwater Gradient 0 001 fuft <br /> • <br /> P\ALRCO\60801Quartcrly120021Arco_6080_IQ02 doc Delta <br />