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Site Background Information: Stallworth Auto Sales Page 8 of 11 • TPH-g was detected in soil samples collected from MW 11 at depths of 60 feet, 65 feet and 70 feet bsg at concentrations of 320 mg/kg, 340 mg/kg and 44 mg/kg, respectively. • TPH-d was detected in soil samples collected at depths of 50 feet, 60 feet and 65 feet bsg at concentrations of 150 mg/kg, 140 mg/kg and 130 mg/kg, respectively. • BTEX compounds were detected at depths of 60 feet, 65 feet and 70 feet bsg at maximum concentrations of 0.17 mg/kg benzene (60 feet bsg), 4.0 mg/kg toluene (60 feet bsg), 1 .9 mg/kg ethylbenzene (60 and 65 feet bsg), and 11.7 mg/kg total xylenes (60 feet bsg). • TAME was detected at depths of 60 feet, 65 feet and 70 feet bsg at concentrations of 0.11 mg/kg, 0.15 mg/kg and 0.060 mg/kg, respectively. • 1,2-DCA was detected at depths of 60 feet and 65 feet bsg at concentrations of 0.034 mg/kg and 0.038 mg/kg, respectively. • The following additional VOCs were detected: 0.23 mg/kg (60 feet bsg), 0.43 mg/kg (65 feet bsg) and 0.070 mg/kg (70 feet bsg) isopropyl benzene; 0.96 mg/kg (60 feet bsg), 1.1 mg/ kg (65 feet bsg) and 0.16 mg/kg (70 feet bsg) n-propyl benzene; 2.2 mg/kg (60 feet bsg), 0.22 mg/kg (65 feet bsg) and 2.1 mg/kg (70 feet bsg) 1 ,3,5- tri methyl benzene; 7.1 mg/kg (60 feet bsg), 7.0 mg/kg (65 feet bsg) and 0.30 mg/kg (70 feet bsg) 1,2,4-trimethylbenzene; 0.11 mg/kg (60 feet bsg), 0.16 mg/kg (65 feet bsg) and 0.020 mg/kg (70 feet bsg) p-isopropyltoluene; 1.3 mg/kg (60 feet bsg), 2.0 mg/kg (65 feet bsg) and 0.21 mg/kg (70 feet bsg) naphthalene; and 0.10 mg/kg (70 feet bsg) n butylbenzene. HYDROGEOLOGIC MODEL Hydrogeologic or hydrostratigraphic units (HUs)are defined as a body of rock or sediment that has hydrogeologic characteristics (i.e. hydraulic conductivity, pore pressure, etc.)that make it distinct from surrounding bodies of rock or sediment (Sanders, 1998), or a part of a body of rock that forms a distinct hydrologic unit with respect to the flow of ground water (Maxey, 1964). A `flow unit' may be defined as a hydrogeologic unit and is characterized by significantly greater hydraulic conductivity values than overlying and underlying units; a flow unit is capable of serving as a preferred migration route, and could potentially allow migration of large contaminant masses over great distances. Based on the CPT results and comparison with soil descriptions from borings previously advanced on-site, AGE has refined the previous subsurface hydrogeologic model presented in the AGE-prepared Cone Penetrometer Testing Report, dated 10 December 2004. The model is comprised of eleven informal hydrogeologic units: a vadose Advanced GeoEnvironmental,Inc.