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r \ <br /> Date April 25, 2001 <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 Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (First 2001) <br /> 1 Performed quarterly groundwater monitoring and sampling for first quarter 2001 Groundwater <br /> samples were collected from monitoring wells MW-1 through MW-8, MW-1 B, MW-1 C, MW-81B and <br /> MW-8C and submitted for chemical analysis <br /> 2 Delta compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER(Second 2001) <br /> The next sampling event is tentatively scheduled for May 2001 Groundwater samples will be collected <br /> and analyzed for total petroleum hydrocarbons as gasoline (TPHG) using U S Environmental Protection <br /> Agency (USEPA) Method 8015 DHSILUFT, and for benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX), tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPS), ethyl <br /> tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME) and 1,2-dichloroethane (1,2-DCA) using <br /> USEPA Method 8260 <br /> Current Phase of Project 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 Quarterly <br /> Sample Date February 21, 2001 <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 18 83 to 23 78 feet bgs <br /> Direction of Groundwater Flow East-Southeast <br /> Groundwater Gradient 0 0026 ft/ft <br /> C\ARCO\21681QTRi.Y\2001\2168Q101 DOC Delta <br /> 4125101 <br />