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i ' 29 January 2001 AGE-NC Protect No 00-0725 ' Page 8of11 ' 42 ANALYTICAL RESULTS FOR SOIL SAMPLES A total of five excavation, two stockpile composite and seven depth-discrete soil samples were analyzed for TPH-g, BTEX and nine fuel additives by EPA Method 8015 Modified, 8020 and 8260 Modified, respectively • The highest concentration of TPH-g was detected in soil near the north wall of the excavation (sample NW-13') Low concentration of TPH-g was also detected In the soil sample collected from the south wall of the excavation TPH-g was detected in the composite stockpile soil ' samples at concentration of 200 milligram per kilogram (mg/kg) and 260 mg/kg • TPH-g was detected In four soil samples collected from the pilot soil borings advanced for the monitoring well installations TPH-g was detected at concentrations as high as 2,300 ' mg/kg encountered in sample MW2-15 collected at the bottom of the well boring This well pilot boring was established at the western edge of the excavation ' • BTEX were detected at concentrations as high as 4 0 mg/kg from the excavation wall samples BTEX compounds were also detected in the stockpiled soil from the excavation as • high as 0 31 mg/kg BTEX compounds were detected at concentrations as high as 35 mg/kg ' from the well boring samples The greatest concentration of benzene was detected In the deepest soil sample collected from within the soil boring for well MW-2 at 6 8 mg/kg ' • Fuel additives were not detected in the soil samples analyzed Analytical results of soil samples are summarized on Table 1 and Table 2 The laboratory reports (MAI Laboratory I D No 51177-51183 and 54767-54773), quality assurance and quality control (QA-QC) report and chain-of-custody forms are included in Appendix E 43 MASS CALCULATIONS ' Based on the hydrocarbon concentration of TPH-g in excavated stockpile soil samples and highest concentration of TPH-g In soil at the base of the c%cavatlon, an estimated 13 gallons or 64 kilograms (kg) of gasoline were removed from the site during both the UST removal and soil excavation procedures The mass and volume calculations are presented in Appendix F ' Advanced GeoEnviron mental,Inc 1