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?1 <br /> r� Date Aril 26, 2002 <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 Delta Environmental Consultants, Inc 1 Jay R Johnson <br /> Consultant Project No D000-329-1 <br /> Primary Agency/Regulatory ID No Samuel Savi , San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 2002) <br /> 1 Performed quarterly groundwater monitoring and sampling for the first quarter 2002 The monitoring <br /> event was coordinated with the adjacent service stations Groundwater samples were collected from <br /> monitoring wells MW-1 through MW-8, MW-1B, MW-11C, MW-8B, and MW-8C, and submitted for <br /> chemical analysis <br /> 2 Delta compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER(Second 2002) <br /> The next sampling event is tentatively scheduled for May 2002 Groundwater samples will be collected <br /> and analyzed for total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, and <br /> total xylenes (BTEX) using USEPA Method 8015/8020 DHS LUFT, and for tertiary butyl alcohol (TBA), <br /> methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETRE), tertiary amyl <br /> methyl ether (TAME), and 1,2-dichloroethane (1,2-DCA) using USEPA Method 8260 <br /> Current Phase of Protect Monitoring <br /> Frequency of Groundwater Sampling MW-1 through MW-8, MW-1B, MW-1C, <br /> MW-813 and MW-8C= Quarterly <br /> Frequency of Groundwater Monitoring Quarter) <br /> Sample Date February 14, 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 27 to 23 89 feet b s <br /> Direction of Groundwater Flow East-southeast <br /> Groundwater Gradient 0 0026 fttft <br /> P\ARCO121681QTRLY120021Arco_2168_1 Q02 doc Delta <br />