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' 20 March 2002 <br /> AGE-NC Project No 01-0877 <br />' Page 5 of 7 <br />' 3 7 EQUIPMENT DECONTAMINATION <br /> Prior to sample collection, Geoprobe soil and ground water sampling equipment was thoroughly <br />' rinsed with clean water after washing with a solution of Alconox Geoprobe rods were thoroughly <br /> cleaned prior to soil probe boring advancement <br />' 4.0. FINDINGS <br />' Soil descriptions were utilized to construct the site geological model, laboratory analysis of soil and <br /> ground water samples were utilized to assess the petroleum hydrocarbon-Impact on soil and ground <br /> water <br /> 41 SOIL PROFILE <br />' Generally, light brown to bluish gray, damp to moist, silty clay, clayey silt to silt with sand were <br /> encountered from surface grade to approximately 10 feet bsg and at 20 and 25 feet bsg Bluish gray <br /> lie to very dark red, moist, silty sand was encountered at 15 feet bsg and at 30 feet bsg in boring B3 <br /> Moderate brown to very dark red,very moist, sandy silt to silt with sand was encountered at 30 feet <br /> bsg Bonng logs are Included In Appendix A A line of cross section is illustrated on Figure 2 and <br /> a geologic cross section is depicted on Figure 3 <br /> Hydrocarbon odor was observed in soil samples from borings B 1 through B4 Organic vapor was <br /> detected in the soil samples collected from borings B1 through B4 at concentrations as high as 976 <br /> parts per million (B1-20) Organic vapor field measurements are included on the boring logs in <br /> Appendix A <br /> 42 ANALYTICAL RESULTS OF SOIL SAMPLES <br /> TPH-g, TPH-d and TPH-mo were detected in the soil samples collected from borings B 1 through <br /> B4 at concentrations ranging from 0 38 (milligrams per kilogram) mg/kg to 8,100 mg/kg TPH-g, <br /> 400 mg/kg to 5,500 mg/kg TPH-d and 200 mg/kg to 9,200 mg/kg TPH-mo TRPH was detected in <br /> the soil samples collected from borings B1 through B4 at concentrations as high as 36,000 mg/kg <br /> (B4-30) One or more BTEX compounds were detected in the samples collected from borings B1 <br /> through B4, with the exception of the 15-foot soil sample from B3, at concentrations as high as 45 <br /> mg/kg benzene, 630 mg/kg toluene, 150 mg/kg ethylbenzene and 760 mg/kg total xylenes (B4-30) <br /> Seven additional volatile organic compounds were detected in the soil samples at concentrations <br /> ranging from 0 010 mg/kg to 440 mg/kg <br /> Advanced GeoEnvironmental,Inc <br />