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l �y <br /> Date Januaa 31, 2001 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 00548 Address 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer Chuck Carmel <br /> Consulting Co/Contact Person Delta Environmental Consultants Inc 1 Jay R Johnson <br /> Consultant Project No D000-321-1 <br /> Primary Agency/Regulatory ID No Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Fourth 2000) <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-6 for laboratory <br /> analysis Groundwater elevation data was also collected from vapor extraction and monitoring wells <br /> on December 18, 2000 <br /> 2 Delta Environmental, Inc compiled and evaluated groundwater monitoring data <br /> 3 Maintained and operated the SVE and AS systems Conducted site visits to optimize system <br /> performance <br /> 4 Prepared and submitted a startup and source test report to San Joaquin Valley Unified APCD <br /> WORK PROPOSED FOR NEXT QUARTER (First 2001) <br /> 1 Quarterly groundwater monitoring will continue on behalf of ARCO The next sampling event is <br /> tentatively scheduled for March 2001 Monitoring wells MW-1 through MW-6 will be sampled and <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHG) using United States Environmental <br /> Protection Agency (USEPA) Method 8015 modified, and for benzene, toluene, ethylbenzene, and total <br /> xylenes, using USEPA Method 8020 Groundwater samples will also be tested for tertiary butyl <br /> alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME) and 1,2-Dichlororthane (1,2-DCA) using EPA method <br /> 8260 <br /> 2 Operation and maintenance of ASISVE system <br /> 3 Free Product bailing and removal <br /> Current Phase of Protect Monitoring/Remediation <br /> Frequency of Groundwater Sampling Wells MW-1 through MW-6 = Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date December 18,2000 <br /> Is Free Product(FP) Present on Site Yes <br /> . FP Recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> C 1ARC0105481QTRL.Y1200010548Q400 DOC Delta <br /> 01/31/01 <br />