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' 15 June 2004 l� AGE-NC Project No 01-0815 ' Page 5 of 8 ' at 40 feet bsg Blue hydrocarbon stained, clay was encountered from approximately 53 feet bsg to 55 feet bsg Lines of cross section are illustrated on Figure 2 and stratigraphic cross sections are depicted in Figures 3 and 4 ' Selected soil samples were sent to Cooper Testing Laboratory(CTL) and analyzed for geotechnical properties The soil sample collected from MW1 at 15 feet bsg is described as a brown sandy silt, with a porosity of 40 9%, an average permeability of 1 OX 10-5 centimeters per second(cm/sec) and a specific gravity of 2 73 cThe hydraulic conductivity in sample MW1-15 ranged from 1 2X 10-5 cm/sec to 1 4X 10 5 cm/sec, which, according to Robertson and others (1990), is consistent 1 with soil behavior associated with clayey silts The soil sample collected from MW2 at 40 feet bsg is described as a gray silty sand,with a porosity of 44 2%,an average permeability of 6 OX 10-6cm/sec r and a specific gravity of 2 66 The hydraulic conductivity in sample MW2 -40 ranged from ' 4 3 X 10-'cm/sec to 6 7X 10-6cm/sec,which is consistent with soil behavior associated with clayey silt to silty sand The soil sample collected from MW3 at 50 feet bsg is described as a gray clayey sand to sandy clay, with a porosity_of 39 5%to 39 2%, an average permeability of 1 OX 10 6 cm/sec and a specific gravityof2 67 cm/sec The hydraulic conductivityin sample MW3-50 ranged from 1 OX 10' cm/sec to 1 1 X 10-6 cm/sec, which is consistent with soil behavior associated with clayey silts CTL . laboratory reports are included in Appendix E ' Hydrocarbon like odors were detected in soil samples collected from 25 to 55 feet bsg in boring Y p g g MW 1, between 25 feet to 45 feet bsg in boring MW2, between 25 feet and 55 feet bsg in boring MW3 and between 35 feet to 50 feet bsg in boring MW4 In addition, organic vapor was detected by the OVM in soil samples collected from all four borings at concentrations as high as 480 parts ' per million(ppm)in sample MW2-40 Organic vapor field measurements are included on the boring logs in Appendix B ' 32 ANALYTICAL RESULTS OF SOIL SAMPLES A total of 14 soil samples were analyzed for TPH-g, BTEX and five fuel additives TPH-g was detected in soil samples collected from borings MW1 through MW4 at maximum ' concentrations in each boring of 12 milligrams per kilogram(mg/kg)(MW 1-40),2 9 mg/kg (MW2- 45), 5 7 mg/kg (MW3-45) and 2 7 mg/kg(MW4-40), respectively At least one of the following,benzene,toluene,ethylbenzene and total xylenes,were detected in soil 1 samples collected from bona s MW1 through MW4 at maximum concentrations of 0 44 p g g mg/kg (benzene),0 072 mg/kg(toluene),0 12 mg/kg(ethylbenzene)and 0 20 mg/kg(xylenes),respectively 1 ' Advanced GeoEnvironmental,Inc 1