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' Report—Remedial Action Feasibility Page 12 Cutter Lumber—Western Lift Site ' GPB Project No 102 3 . August 1,2003 5.0 SAMPLE ANALYTICAL RESULTS The following sub-sections describe the sample analytical results 5.1 Soil Sample Analytical Results The soil analytical results are summarized in Summary Table 1 In general, detectable concentrations of gasoline range petroleum hydrocarbons and/or BTEX compounds are present from the approximate levels of first groundwater (about 30 feet bgs) and extending to the total depth of the borings The maximum concentrations occur near the ' 35 to 40-foot level Data from other wells suggest that contaminant concentration generally decrease dramatically between 40 and 45 feet and the 50-foot level is the effective base of the gasoline-impacted interval Three soil samples from each new boring were selected for analytic testing The soil analytical data is shown in Summary Table 1 below Summary Table 1 -Soil Analytical Data Boring No Depth Sample I Gasoline Benzene Toluene Ethyl Xylene Benzene Source feet Date I mg/Kg µg/Kg gg/Kg µg/Kg 4g/Kg VEW-1 255 260 02/21/03 ND<1 ND<3 ND<3 ND<3 ND<3 ' 355 360 02/21/03 17 55 63 131 163 405410 02/21/03 454 889 2,660 390 23,600 ASW 1 255 260 02/20/03 ND<l ND<3 ND<3 ND<3 ND<3 'i 40 5-41 0 02/21/03 1,460 4,750 26,800 13,600 68,700 45 5-46 0 02/20/03 17 1 448 1,400 227 1,140 NA=Not Applicable ND=Not Detected 5.2 Air Sample Analytical Results During the course of vapor extraction test, samples of raw, extracted vapor and of effluent gas were collected on several occasions These samples were collected to assess the effectiveness if the vapor extraction remedial process and the efficiency of the carbon unit in preventing fugitive hydrocarbon emissions to the atmosphere As shown in Summary Table 2, the first sample was collected shortly after the VES system was activated, and at several important times thereafter The laboratory data show that initially, the carbon unit was effective in eliminating gasoline-laden vapor from being discharged to the ' atmosphere The data also reflect the relative low concentration of gasoline in the vapor extracted by the VES system alone, and the much higher concentration achieved during simultaneous vapor extraction and air sparging 1 ' 2937 Veneman Ave,#13240 Geo-Phase Environmental Inc Phone(209)569-0293 Modesto, CA 95356 Fax(209)569-0295