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ARCO Products Company • 2 ARCO Service station#595,6200 North Highway94,Stockton,CA February 28,2000 • twenty-one samples with concentrations ranging from 1 94 mg/kg (PL-5@4 5') to 11,300 mg/kg (OPL-3@4 5') Benzene was reported in fifteen samples at concentrations ranging from 0 0316 mg/kg (PL-2@7') to 48 3 mg/kg (D-4@5') MtBE was reported in fourteen of the samples ranging in concentration from 0 110 mg/kg (VL- 3@3') to b 47 mg/kg (D-1@3') TBA, DIPE, EtBE, TAME, 1,2 DCA, and EDB were reported as nondetect in all samples Approximately 189 tons of soil generated dunng the removal of the underground facilities and the trenching for new piping was disposed of at BFI Landfill in Livermore, CA PROPOSED SCOPE OF WORK The scope of work for this site assessment will include the installation of four groundwater monitoring wells and the drilling of two soil borings with the possible installation of soil vapor extraction wells in the soil borings at the locations shown on Figure 2 The wells and borings have been proposed to evaluate the vertical and lateral extent of petroleum hydrocarbons in soil and groundwater beneath the product lines and dispensers As required by the Occupational Health and Safety Administration (OSHA) Standard "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910 120), and by California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR has prepared a Site-Specific Health and Safety Plan prior to the commencement of fieldwork The Site-Specific Health and Safety Plan will be reviewed by the field staff and contractors before beginning field operations at the site and is included as Attachment B The specific scope of work is discussed below • Soil Borings and SVE Well Installation. Two soil borings will be dnlled at the locations shown on Figure 2 Soil borings will be drilled to a minimum depth of 40 feet bgs or until three consecutively "clean" soil samples are collected Borings will be drilled using 8-inch diameter hollow-stem auger Upon completion of drilling, a 2-inch diameter soil vapor extraction well may be installed in selected borings depending on field observations If PTD readings or other subjective field data suggest the presence of significant concentrations of hydrocarbons in soil, a SVE well will be installed in that boring Borings in areas where field data suggest no obvious hydrocarbon impact will be backfilled with cement grout from the bottom of the boring to the surface • Groundwater Monitoring Wells. Four groundwater monitoring . wells (MW-1 through MW-4) will be installed at the locations shown 077 4194131O/WPLAN2