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1 .i`'mow°' �. :•'liu:,.._ .4 -- _ - _ �•-..sem _ w. �" �aoo-3,► <br /> IBMii <br /> Results of Initial Investigation and Work Plan December 18, 1990 <br /> ARCO Service Station No. 548, Stockton, Ca:ifornia AGS 30004-2 <br /> Mobile Chem Labs Inc. of Martinez, California (Hazardous Waste Testing Laboratory <br /> Certificate No. 195). Copies of laboratory analytical reports are in Appendix B. <br /> The concentrations of hydrocarbons in soil samples are presented in Table 2. TPHg <br /> concentrations were below detection limits and BTEX cot icentrations were below 0.010 ppm <br /> in the samples from boring B-1 at 10, 20, and 45 feet below grade. Results of analyses of . <br /> the soil sample collected from 6fl feet.below grade in boring B-1 indicated a TPHg <br /> caricentration of 1,400 Ppm and BTEX concentrations of 0.61, 24, 28, and 160ppm; <br /> respectively. At 40 feet below grade, TPHg concentrations were 8.6 ppm and BTEX <br /> concentrations were below 1.0 ppm. <br /> Results of analyses of the soil sample collected fro 30` eet below grade in boring B-3 <br /> indicated TPHg concentrations of 650 ppm and BTEX concentrations of less than 0.005 13, <br /> 9.4,and 58 ppiii respectively. The soil sample collected fro 45 eet below grade in boring: <br /> B-3:contained'TPHg concentrations of 840 ppm and BTEX concentrations of l'?,22;6.3, <br /> and:64 ppm,respectively. These compounds were below detection limits in the soil sample <br /> collected from.40 feet below grade. <br /> TPHg and BTEX concentrations were below 1.0 ppm in soil samples collected from borings t <br /> B-2, B-4 and B-5, except in the sample collecte 10 eet below grade in boring B-2 (5-10- . <br /> B2). A concentration of 1.6 ppm TPHg Vas detected in soil sample S-10-132. <br /> a <br /> Ij <br /> e <br /> �!i®p/led GeoSYstems <br />