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Date A riI 30, 2002 <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 (First 2002): <br /> 1. Depth to groundwater was measured in the vapor extraction and groundwater monitoring wells on <br /> March 12, 2002. Groundwater samples were collected from monitoring wells MW-1 through MW-6, <br /> and vapor wells VW-1 through VW-5, and submitted for laboratory analysis. <br /> 2. Compiled and evaluated groundwater monitoring and chemical analytical 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 /> WORK PROPOSED FOR NEXT QUARTER(Second 2002): <br /> • 1. Quarterly' groundwater monitoring will continue on behalf of ARCO. The next sampling event is <br /> tentatively scheduled for June 2002. Monitoring wells MW-1 through MW-6, and vapor extraction <br /> wells VW-1 through VW-5,will be sampled and analyzed for total petroleum hydrocarbons as gasoline <br /> (TPHG) using United States Environmental Protection Agency (USEPA) Method 8015 DHS LOFT, <br /> and for benzene, toluene, ethylbenzene, total xylenes (BTEX), tertiary butyl alcohol (TBA), methyl <br /> tertiary butyl ether (MTBE), di-isopropyl ether (D1PE), ethyl tertiary butyl ether (ETBE), tertiary amyl <br /> methyl ether(TAME), and 1,2-Dichloroethane (1,2-DCA) using EPA 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: Quarterly _. <br /> Sampling Date: March 12,2002 <br /> Is Free Product(FP) Present on Site: No FP detected durinq this quarter <br /> FP Recovered this Quarter: No FP <br /> Cumulative FP Recovered to Date: 7 gallons <br /> Approximate Depth to Groundwater: 25.94 to 27.40 feet b s <br /> Direction of Groundwater Flow: East <br /> Groundwater Gradient: 0.0026 fVft <br /> P:1ARCO%05481QTRLY120021Arco_05.48_1 Q02.doc Delta <br />