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Iw (V . Date T February 28, 2002 ARCO QUARTERLY GROUNDWATER MONITORING REPORT Facility No 2168 Address 441 Charter Way, Stockton, California ARCO Environmental Engineer Kyle Christie Consulting Co/Contact Person Delta Environmental Consultants, Inc /Jay R Johnson Consultant Project No D000-329-1 - Primary Agency/Regulatory ID No Lori Duncan, San Joaquin County Public Health Services WORK PERFORMED THIS QUARTER (Fourth 2001) 1 Performed quarterly groundwater monitoring and sampling for the fourth quarter 2001 The monitoring event was coordinated with the adjacent service stations Groundwater samples were collected from monitoring wells MW-1 through MW-8, MW-113, MW-1C, MW-$B, and MW-8C, and submitted for chemical analysis 2 Delta compiled and evaluated groundwater monitoring data • WORK PROPOSED FOR NEXT QUARTER (First 2002) The next sampling event is tentatively scheduled for February 2002 Groundwater samples will be collected and analyzed for total petroleum hydrocarbons as gasoline (TPHG), benzene, toluene, ethylbenzene, and total xylenes (BTEX) using USEPA Method 8015/8020 DHS LUFT, and for tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), and 1,2-dichloroethane (1,2-DCA) using USEPA Method 8260 Current Phase of Protect Monitoring Frequency of Groundwater Sampling MW-1 through MW-8, MW-1 B, MW-1 C, MW-813 and MW-8C= Quarterly Frequency of Groundwater Monitoring Quarter) Sample Date December 6, 2001 Is Free Product(FP) Present on Site No FP Recovered This Quarter NA Cumulative FP Recovered to Date NA Approximate Depth to Groundwater 18 29 to 25 45 feet bgs Direction of Groundwater Flow Southeast Groundwater Gradient 0 0026 ft/ft • P\ARC0121681QTPLY120011Arco_2168_4Q01 doc Delta