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�i <br /> Date November 9, 2001 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 00548 Address: 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer: Paul Supple <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 (Third 2001): <br /> 1. Groundwater samples were collected from monitoring wells MW-1 through MW-6 and submitted for <br /> laboratory analysis. Depth to groundwater measurements were also collected from the vapor <br /> extraction and groundwater monitoring wells on September 11, 2001. <br /> 2. Compiled and evaluated groundwater monitoring data. <br /> 3. Maintained and operated the SVE and AS systems. Conducted site visits to optimize system <br /> performance and collect air vapor samples. <br /> 4. Compressor for air sparging was shut down due to complaints from neighbors and was restarted after <br /> installing a timer on corepressor to run between 0700 hrs and 2200 hrs. <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 2001): <br /> 1. Quarterly groundwater monitoring will continue on behalf of ARCO. The next sampling event is <br /> tentatively scheduled for December 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 DHS LUFT, and for benzene, toluene, ethyl benzene,.total <br /> xylenes (BTEX), tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether <br /> (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME) and 1,2-Dichlororthane <br /> (1,2-DCA) using EPA method 8260. <br /> 2. Operate and maintain ASISVE system. <br /> 3. Monitor well VW-5D for the presence of free product (measure thickness and remove product by <br /> bailing if encountered). <br /> Current Phase of Project: Remediation <br /> Frequency of Groundwater Sampling: Wells MW-1 through MW-6 = Quarterly <br /> Frequency of Groundwater Monitoring: Quarterly <br /> Sampling Date: Se tember 11,2001 <br /> Is Free Product(FP) Present on Site: No FP detected during this quarter <br /> FP Recovered this Quarter: No FP <br /> Cumulative FP Recovered to Date: 7 gallons <br /> Approximate Depth to Groundwater: 27.69 to 29.65 feet bgs <br /> P:\ARCO\0548\QTRLY\2001\Arco-0548-3QOI Report.doc Delta <br />