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Date May 23, 2001 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No: 00548 Address: 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer: Chuck Carmel <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 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 March 14, 2001. <br /> 2. Compiled and evaluated groundwater monitoring data. <br /> 3. Conducted bimonthly site visits to measure and bail free product from well VW-5D <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 (Second 2001): <br /> 1. Quarterly groundwater monitoring will continue on behalf of ARCO. The next sampling event is <br /> tentatively scheduled for June 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 /> (DIPS), 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. Measure free product and bail and remove, if necessary. <br /> i <br /> CAlARC0105481QTRLY1200110548 Q101.doc Delta <br /> 05/23/01 <br />