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• 11 April 2003 AGE-NC Project No 01-0865 Page 4 of 9 Hydrocarbon-like odor was detected in soil samples collected from approximately 18 to 34 feet bsg from borings B 11 and B 12,and from surface grade to 18 feet bsg in boring B 13 In addition,organic vapor was detected by the OVM in soil samples collected from borings B 11 through B 13 at concentrations in excess of the maximum detection limit of 2,000 parts per million(ppm)in sample B 11 (Appendix B) Two soil samples, one from the peat layer and one from the underlying silty sand layer, were collected from soil bonngs B 12 and B 13 and analyzed for geotechnical properties The peat samples from B 12 and B 13 were both described as dark brown to brown and black peat with silt,with very high porosity (85 to 92%) and organic content (76 to 88%), but very low average permeability (2x10 to 6x10'' centimeters per second (cm/sec)), the highest porosity and permeability was encountered in the B 12 peat sample The sand sample from B1 2 was described as a gray,clayey sand with 31%porosity and 2x 10"'cm/sec average permeability,the sand sample from B 13 was described as a dark brown silt with organics, with 33%porosity and 2x 10-'cm/sec average permeability The geotechnical laboratory reports(Cooper Testing Lab ID#255-026)and chain-of-custody forms are included in Appendix C Lines of cross section are illustrated on Figure 2 and geologic cross sections are depicted on Figures 3 and 4 32 ANALYTICAL RESULTS OF SOIL SAMPLES A total of twenty-four soil samples were submitted for laboratory analysis TPH-g was detected in soil samples B11-22, B11-23, B12-20, B12-22, B13-6 and B13-10 at a maximum concentration of 2,200 milligrams per kilogram (mg/kg) in sample B11-22, the vertical and lateral distribution of TPH-g in soil is illustrated on Figures 5 through 7 TPH-d was detected in samples B11-22, B11-23 and B12-20 at a maximum concentration of 3,500 mg/kg (B11-22) BTEX compounds were detected in samples BI 1-22, B11-23, BI 1-26, B 12-20, B12-22, B12-26, B12-30, B13-6 and B13-10 at maximum concentrations of 5 4 mg/kg benzene (Bl 1-23), 86 mg/kg toluene (B12-20), 38 mg/kg ethylbenzene (B 11-22) and 131 mg/kg total xylenes (B12-20) The vertical and lateral distribution of benzene in soil is illustrated on Figures 8 through 10 MTBE was detected by EPA Method 8260B in samples B13-6 and B13-10 at concentrations of 0 5 mg/kg and 0 038 mg/kg, respectively In addition, MTBE was detected in samples B11-30, B11-34,B11-42,B11-46,B12-14,B12-26,B12-30,B13-6 and B13-10 at amaximum concentration of 99 micrograms per liter(µg/1), in sample B 13-6,utilizing EPA extraction Method 1311 (TCLP) The vertical and lateral distribution of MTBE in soil is illustrated on Figures 11 through 13 ri Advanced GeoEnvironmental,Inc