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Date August 9, 20_02 <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: URS Group, Inc. 1 Vern Elarth <br /> Consultant Project No: U548-01-4 <br /> Primary Agency/Regulatory ID No: Lori Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Second 2002): <br /> 1. Depth to groundwater was measured in the vapor extraction and groundwater monitoring wells on <br /> June 17, 2002. Groundwater samples were collected from monitoring wells MW-1 through MW-6, <br /> and vapor extraction wells VW-1 through VW-4, VW-5S, and VW-5D and submitted for laboratory <br /> analysis. <br /> 2. Groundwater monitoring and chemical analytical data was compiled and evaluated. <br /> 3. 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 2002): <br /> 1. Quarterly groundwater monitoring will continue on behalf of ARCO. The next sampling event is <br /> tentatively scheduled for September 2002. Monitoring wells MW-1 through MW-6, and vapor <br /> extraction wells VW-1 through VW-4, VW-5S, and VW-5D, will be sampled and analyzed for total <br /> petroleum hydrocarbons as gasoline (TPHG) using United States Environmental Protection Agency <br /> (USEPA) Method 8015 DHS LUFT, and for benzene, toluene, ethylbenzene, total xylenes (BTEX), <br /> tertiary butyl alcohol (TBA), methyl tertiary butyl ether (MTBE), di-isopropyl ether (DIPE), ethyl tertiary <br /> butyl ether (ETBE), tertiary amyl methyl ether (TAME), and 1,2-Dichloroethane (1,2-DCA) using EPA <br /> method 8260. <br /> 2. Operate and maintain AS/SVE system. <br /> Current Phase of Project: Remediation <br /> Frequency of Groundwater Sampling: Wells MW-1 through MW-6 and VW-1 <br /> through VW-5=Quarterly <br /> Frequency of Groundwater Monitoring: Quarter) <br /> Sampling Date: June 17, 2002 <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: 13.07 to 28.26 feet b s - <br /> . Direction of Groundwater Flow: East-Northeast <br /> Groundwater Gradient: 0.0030 ft/ft <br /> PABp-Arco for URS\548\Quarterly\Arco_0548_2Q02.doe 5tratu5 <br />