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15 March 2002 <br /> AGE-NC Project No 97-0249 <br /> Page 8of10 <br /> I area The inferred extent of dissolved hydrocarbon-impact within HU-1 is depicted in Figure <br /> 9, the HU-1 plume appears delineated towards the north, northeast and southwest of the <br /> former UST area <br /> • Hydrologic Unit No 2 appears to be significantly less impacted than HU-1, contaminants <br /> were detected in 5 of 9 water samples from HU-2 TPH-g has been detected in water samples <br /> at concentrations as high as 780µg/1, TPH-d concentrations as high as 330 gg/1 and benzene <br /> concentrations as high as 15 µg/l A dissolved petroleum-hydrocarbon plume appears to be <br /> located between the former UST area and the south fuel dispenser area, a second minor <br /> petroleum-hydrocarbon plume appears to be located in the area between CPT soil borings <br /> P-13 and P-15 The inferred extent of dissolved hydrocarbon-impact within HU-2 is depicted <br /> in Figure 10, the HU-2 plumes appear delineated towards the north, northeast, east and <br /> northwest of the former UST area <br /> • Hydrologic Unit No 3 appears to be significantly less petroleum-impacted than HU-1 and not <br /> as widespread than HU-2, contaminants were detected in 3 of 9 water samples from HU-3 <br /> TPH-g has been detected in water samples at concentrations as high as 740 ,ug/l, TPH-d <br /> concentrations as high as 1,000 µg/1 and benzene concentrations as high as 16 µg/1 A <br /> dissolved petroleum-hydrocarbon plume appears to be located in the area between CPT soil <br /> borings P-15 and P-17 The inferred extent of dissolved hydrocarbon-impact within HU-3 <br /> is depicted in Figure 11, the HU-3 plume appears delineated towards the north, northeast, <br /> east and northwest of the former UST area <br /> Hydrologic Unit No 4 at the site is characterized by wide-spread concentrations of fuel <br /> components, contaminants were detected in 6 of 9 water samples from HU-4 TPH-g has <br /> been detected in water samples at concentrations as high as 550 µg/l, TPH-d at <br /> concentrations as high as 650,ug/l,benzene concentrations as high as 37 µg/l and 1,2-DCA <br /> at a concentration of 1 1 µg/1 The plume appears to be widespread and generally located near <br /> the former UST area and the north fuel dispenser area The inferred extent of dissolved <br /> hydrocarbon-impact within HU-4 is depicted in Figure 12, the HU-4 plume appears <br /> delineated towards the north and east of the former UST area <br /> • Hydrologic Unit No 5 at the site is characterized by increasing concentrations of fuel <br /> components, contaminants were detected in 6 of 8 water samples from HU-5 TPH-g has <br />' been detected in water samples at concentrations as high as 2,900 ug/l, TPH-d at <br /> concentrations as high as 2,300 µg/l, benzene concentrations as high as 140 µg/1 and <br /> 1,2-DCA concentrations as high as 6 8 µg/1 The plume appears to be widespread and <br /> generally located near the former UST area, however intense petroleum hydrocarbon <br /> concentrations were detected in the area containing P-11 and P-15 and in the area containing <br /> P-12 The inferred extent of dissolved hydrocarbon-impact within HU-5 is depicted in Figure <br />' 13, the HU-5 plume appears delineated towards the north, northeast, east and southwest of <br /> the former UST area <br />' advanced GeoEnvironmental,Inc <br />