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• Site Background Information <br />' AGE-NC Project No 02-0950 <br /> Page 2 of 4 <br />' STRATIGRAPHY <br /> Generally, gray, orange-brown to dark-brown, dry slit with sand and gravel (fill material) was <br /> encountered from surface grade to approximately 6 feet below surface grade (bsg) Light yellow- <br /> orange-brown to dark brown,damp to moist clays,clayey silts,and clayey sands were encountered <br /> from approximately 6 feet to 21 feet bsg Brown,blue-gray to dark-gray, saturated, fine to coarse <br /> sand and silty sand were encountered from approximately 21 feet to 29 feet bsg, but to almost 35 <br /> feet bsg in the area of MW-2 Gray to blue-gray, moist to saturated clay with medium to high <br /> toughness and plasticity was encountered from approximately 29 feet to 36 feet bsg Blue-gray to <br />' green-gray, saturated silt was encountered <br /> wapet to 49 feet bsg in soil proximately <br /> ly 49 feet bsg to total h <br /> oring <br /> B4 Green-gray,saturated fine sand was encountered frompproxim <br />' in soil boring B4 <br /> PREVIOUS SITE ASSESSMENTS <br /> On 15 and 16 October 2002 three soil borings(BI though 133)were advanced to a depth of 35 feet <br /> obing unit <br /> uipped with I 25-inch <br /> bsg utilizing avan-mounted' Geopro 0of soil andugrab� groundwateasamp es After probing• probing rods,for the collection and analysis <br /> to a depth of 25 feet bsg, ground water was found to be at approximately 22 feet bsg <br /> ' Soil boring B1 was advanced in the northwest er of the former UST exca as onXand soil boringT ecavation, soil was <br /> B s <br /> was advanced approximately 5 feet east of the former <br /> advanced approximately 10 feet southwest of the former UST excavation <br /> ' <br /> A total of six samples les were analyzed for the petroleum hydrocarbon products TPH-g was <br /> p <br /> detected in soil samples collected from all three borings at a maximum concentration of <br /> 22,000 milligrams per kilogram (mg/kg) in sample 132-15 TPH-d was detected in soil samples <br /> collected from borings B 1 and B2 at s maximum es concentration <br /> collected from all 0threegbog gsin aatple maxBimum <br /> 2-15 <br /> BTEX compounds were detected m p <br /> concentrations of 1 1 mg/kg, 460 mg/kg, 320 mg/kg, and 1,830 mg/kg, respectively, in sample <br /> B2-15 Lead was detected by EPA Method <br /> B2d 5010B in one soil sample No additional analytes werected in boring dete ted at o a at a <br /> hove <br /> concentration of 59 mg/kg in sample <br /> ' laboratory detection limits in the soil samples analyzed <br /> A grab ground water sample was collected from each of the three borings on 15 and 16 October <br /> ' 2002 and analyzed for the petroleum hydrocarbon products TPH-g was detected in ground water <br /> samples collected from each boring at a maximum concentration of 170,000 micrograms per liter <br /> (µg/1)in boring B2 TPH-d was detected in ground water samples collected from borings B 1 and B2 <br /> ' at a maximum concentration of 23,OOOt�rg/lbor Hors agmaximum�concentrations f S50 µg11(B3), <br /> compounds were detected in <br /> ground water samples collected from a g <br /> ' Advanced GeoEnvironmental,Inc <br />