Laserfiche WebLink
24 April 2000 <br /> AGE-NC Project No. 97-0327 <br /> Page 4 of 6 <br /> ' 3.0. FINDINGS <br /> Soil descriptions were utilized to construct geologic cross sections of the site; field data was utilized <br /> to select soil samples for laboratory analysis. Petroleum hydrocarbon impact to saturated and <br /> unsaturated soil was assessed and quantified by laboratory analysis. Laboratory analysis of eleven <br /> soil samples detected TPH-g,TPH-d or BTEX compounds in four soil samples; MTBE was detected <br /> in three soil samples. <br /> 3.1. STRATIGRAPHY <br /> Generally, a pale to dark brown, very stiff to hard, fine sandy silt was encountered between 10 feet <br /> bsg and 20 feet bsg.A yellowish orange to gray-brown,dry to moist,medium dense to hard, silty fine <br /> sand was generally encountered between 25 feet bsg and 35 feet bsg. A pale to dark brown, dry to <br /> moist, very stiff to hard, fine sandy, clayey silt was generally encountered at depths between 40 and <br /> 50 feet bsg. A dark brown to gray-brown, saturated, medium dense to dense, silty fine sand was <br /> generally encountered between 55 feet bsg and 70 feet bsg. <br /> Saturated soil was generally encountered at 55 feet bsg in borings MW-1,MW-2 and MW-3; ground <br /> water levels were measured at 51 feet bsg utilizing a Solinst water level meter. Boring logs are <br />' included in Appendix A. General lithology beneath the site in cross-sectional view is depicted in <br /> Figures 3 and 4. <br /> 3.2. FIELD EVIDENCE OF HYDROCARBON-IMPACTED SOIL AND GROUND WATER <br /> Petroleum hydrocarbon odor or petroleum hydrocarbon vapor (using a PID) were detected in soil <br /> sample duplicates collected from soil boring MW-I at a depth of 40 feet bsg; soil boring MW-2 at <br /> depths between 25 and 55 feet bsg; and soil boring MW-3 at depths between 20 and 55 feet bsg, <br /> 3.3. ANALYTICAL RESULTS OF SOIL SAMPLES <br /> A total of eleven soil samples were submitted to a DHS-certified laboratory for analysis of TPH-g, <br /> TPH-d, BTEX, MTBE and fuel oxygenates. TPH-g and TPH-d were detected in soil samples <br /> collected from MW-2 at 30 and 40'feet bsg and frorii MW-3 at 45 feet bsg at concentrations as high <br /> as 480 milligrams per kilogram (mg/kg). BTEX compounds were detected in the samples from <br />' MW-2 at 40 feet bsg and from MW-3 at 45 feet bsg at concentrations ranging as high as 1.8 mg/kg. <br /> MTBE was detected in the samples from MW-1 at 40 feet bsg, MW-2 at 40 feet bsg and MW-3 at <br /> 45 feet bsg at concentrations ranging as high as 0.89 mg/kg. No other fuel oxygenates were detected <br /> 1 <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />