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. Site Background Information AGE-NC Project No 02-0950 Page 2 of 4 STRATIGRAPHY Generally, gray, orange-brown to dark-brown, dry silt with sand and gravel (fill material) was encountered from surface grade to approximately 6 feet below surface grade (bsg) Light yellow- orange-brown to dark brown, damp to moist clays, clayey silts, and clayey sands were encountered from approximately 6 feet to 21 feet bsg Brown, blue-gray to dark-gray, saturated, fine to coarse sand and silty sand were encountered from approximately 21 feet to 29 feet bsg,but to almost 35 feet bsg in the area of MW-2 Gray to blue-gray, moist to saturated clay with medium to high toughness and plasticity was encountered from approximately 29 feet to 36 feet bsg Blue-gray to green-gray, saturated silt was encountered from approximately 36 feet to 49 feet bsg in soil boring B4 Green- gray, saturated fine sand was encountered from approximately 49 feet bsg to total depth in soil boring B4 PREVIOUS SITE ASSESSMENTS On 15 and 16 October 2002,three soil borings (B 1 though B3)were advanced to a depth of 35 feet bsg utilizing a van-mounted Geoprobe 5400 direct-push probing unit equipped with 1 25-inch probing rods, for the collection and analysis of soil and `grab' groundwater samples After probing to a depth of 25 feet bsg, ground water was found to be at approximately 22 feet bsg Soil boring B 1 was advanced in the northwest corner of the former UST excavation,soil boring B2 was advanced approximately 5 feet east of the former UST excavation, and soil boring B3 was advanced approximately 10 feet southwest of the former UST excavation A total of six soil samples were analyzed for the petroleum hydrocarbon products TPH-g was detected in soil samples collected from all three borings at a maximum concentration of 22,000 milligrams per kilogram (mg/kg) in sample B2-15 TPH-d was detected in soil samples collected from borings B1 and B2 at a maximum concentration of 7,500 mg/kg in sample B2-15 BTEX compounds were detected in soil samples collected from all three borings at maximum concentrations of 1 1 mg/kg, 460 mg/kg, 320 mg/kg, and 1,830 mg/kg, respectively, In sample B2-15 Lead was detected by EPA Method 6010B in one soil sample collected in boring B2 at a I concentration of 59 mg/kg in sample B2-15 No additional analytes were detected at or above laboratory detection limits In the soil samples analyzed A grab ground water sample was collected from each of the three borings on 15 and 16 October 2002 and analyzed for the petroleum hydrocarbon products TPH-g was detected in groundwater samples collected from each boring at a maximum concentration of 170,000 micrograms per liter (µg/1) in . boring B2 TPH-d was detected In ground water samples collected from borings B1 and B2 at a maximum concentration of 23,000 µg/1 in boring B2 BTEX compounds were detected in ground Advanced GeoEnvironmental,Inc