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►1 <br /> r <br /> Date July 31, 2002 <br /> f <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 2168 Address 441 Charter Way, Stockton, California <br /> ARCO Environmental Engineer Kyle Christie <br /> Consulting Co/Contact Person URS Group, Inc / Mr Vern Elarth <br /> Consultant Project No U2168-03-4 <br /> Primary Agency/Regulatory ID No Samuel Savi , San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER(Second 2002) <br /> 1 Performed quarterly groundwater monitoring and sampling for the second quarter 2002 The <br /> monitoring event was coordinated with the adjacent service stations Groundwater samples were <br /> collected from monitoring wells MW-1 through MW-8, MW-1B, MW-1C, MW-813, and MW-8C, and <br /> submitted for chemical analysis <br /> 2 Groundwater monitoring data was compiled and evaluated <br /> WORK PROPOSED FOR NEXT QUARTER(Third 2002) <br /> iThe next sampling event is tentatively scheduled for September 2002 Groundwater samples will be <br /> collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) using USEPA Method 8015/8020 DHS LUFT, and for tertiary butyl <br /> alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether(TAME), and 1,2-dichloroethane (1,2-DCA) using USEPA Method 8260 <br /> Current Phase of Project Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-8, MW-1 B, MW-1 C, <br /> MW-8B and MW-8C= Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sample Date June 13, 2002 <br /> Is Free Product(FP) Present on Site No <br /> FP Recovered This Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 19 73 to 24 15 feet b9s. <br /> Direction of Groundwater Flow Fast-Southeast <br /> Groundwater Gradient 0 0018 ft/ft <br /> P Tp-Arco for URS121681Quarterly120021Arco_2168_2QO2 doc <br />