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• {z <br /> Date August 24, 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./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 (Second 2001): <br /> I. 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 June 19, 2001. <br /> 2. Monitored well VW5-D for the presence of free product, measured thickness, and removed product by <br /> bailing. <br /> 3. Compiled and evaluated groundwater monitoring data. <br /> 4. Maintained and operated the SVE and AS systems. Conducted site visits to optimize system <br /> performance and collect air vapor samples. <br /> WORK PROPOSED FOR NEXT QUARTER(Third 2001): <br /> 1. Quarterly groundwater monitoring will continue on behalf of ARCO. The next sampling event is <br /> tentatively scheduled for September 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, ethylbenzene, 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-51D 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: June 19,2001 <br /> Is Free Product(FP)Present on Site: Yes <br /> FP Recovered this Quarter: 3 gallons <br /> Cumulative FP Recovered to Date: 7 gallons <br /> C:IARC0105481QTRLY120011Arco-0548 2Q01 Report.doe Delta <br /> 08/24/01 <br />