Laserfiche WebLink
Date March 8, 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 Coun Public Health Services <br /> WORK PERFORMED THIS QUARTER(Fourth 2001): <br /> 1. Groundwater samples were collected from monitoring wells MW-1 through MW-6, and vapor wells <br /> VW-1 through VW-5, and submitted for laboratory analysis. Depth to groundwater measurements <br /> were also collected from the vapor extraction and groundwater monitoring wells on December 13, <br /> 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 /> WORK PROPOSED FOR NEXT QUARTER (First 2002): <br /> 1. Quarterly groundwater monitoring will continue on behalf of ARCO. The next sampling event is <br /> tentatively scheduled for March 2002. 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 /> (DIPS), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME) and 1,2-Dichloroethane <br /> (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=Quarter) <br /> Frequency of Groundwater Monitoring: ^ Quarterly <br /> Sampling Date: December 13, 2001 <br /> Is Free Product(FP) Present on Site: No FP detected during_thisquuarter <br /> FP Recovered this Quarter: No FP <br /> Cumulative FP Recovered to Date: 7 gallons <br /> Approximate Depth to Groundwater: 26.95 to 29.10 feet bgs <br /> Direction of Groundwater Flow: East-Northeast <br /> Groundwater Gradient: 0.0026 ftlft <br /> P:IARCO\05481QTRLY1200I1Arco-0548_4Q01.doc Delta <br />