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23 April 2001 <br /> AGE-NC Protect No 96-0229 <br /> Page 2 of 7 <br /> I <br /> Prevention permit and replaced with one 20,000-gallon gasoline UST Upon removal, soil samples <br /> were collected from the floor of the excavation and beneath product piping TPH-g was detected in <br /> i <br /> soil samples collected beneath the dispenser and product piping area and stockpiled soil at <br /> concentrations as high as 260 milligrams per kilogram (mg/kg) <br /> I <br /> Total lead was detected in soil collected beneath the dispenser area, product piping area and in <br /> stockpiled soil at concentrations as high as 2 9 mg/kg <br /> BTEX constituents were detected in soil collected beneath the dispenser and product piping areas, <br /> beneath the east end of the UST area and in stockpiled soil at concentrations as high as 7 8 mg/kg <br /> The greatest benzene concentration was detected beneath the product pipe area at a concentration <br /> of 0 44 mg/kg <br /> MTBE was detected in soil beneath the dispenser and product piping areas,beneath the east and west <br /> ends of the UST area and in stockpiled soil at concentrations as high as 5 08 mg/kg TAME was <br /> detected in soil beneath the dispenser and product piping areas and in stockpiled soil at <br /> concentrations as high as 0 47 mg/kg TBA was detected in soil beneath the east and west ends of <br /> the UST area, beneath the dispenser and product piping areas and in stockpiled soil at concentrations <br /> . as high as 5 1 mg/kg No other fuel oxygenates were detected above laboratory reporting limits from <br /> the analyzed samples Analytical results of soil samples collected during UST removal activities are <br /> summarized in Table 1 <br /> 22 PREVIOUS SUBSURFACE INVESTIGATION <br /> The following is a brief summary of site assessment activities <br /> • Between July and October 1996,nine soil borings(P-1 through P-9)were advanced to depths <br /> of approximately 40 feet both on-site and off-site Soil samples collected from borings P-2, <br /> P-3, P-4, P-5, P-7 and P-8 contained TPH-g at concentrations ranging up to 7,800 mg/kg, <br /> BTEX compounds were detected in soil samples collected from all borings at concentrations <br /> as high as 530 mg/kg, MTBE was detected in soil samples collected from P-1, P-3,P-4 and <br /> P-7 at concentrations as high as 0 012 mg/kg Grab ground water samples collected from P- <br /> 1, P-2, P-3, P-4, P-7, P-8 and P-9 contained TPH-g at concentrations as high as 210,000 <br /> micrograms per liter (µg/1) and BTEX compounds as high as 27,000 µg11, MTBE was <br /> detected in water samples from P-1, P-2, P-3,P-4 and P-9 at concentrations as high as 1,000 <br /> ,ug/l Analytical results of soil and grab ground water samples collected dunng the July <br /> through October 1996 investigation are summarized in Tables 2 and 3 <br /> • On 18, 19, 20 and 21 November 1997, six groundwater monitoring wells (MW-1 through <br /> • MW-6) were installed on and off-site as part of ongoing site assessment activities TPH-g <br /> Advanced GeoEnvironmental,Inc <br />