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Site Background Information : Stallworth Auto Sales Page 8 of 11 • TPH-g was detected in soil samples collected from MW11 at depths of 60 feet, 65 y 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 ) isopropylbenzene ; 0 . 96 mglkg (60 feet bsg ), 1 . 1 mg/ kg (65 feet bsg ) and 0 . 16 mg/kg (70 feet bsg ) n -propy] 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- trimethylbenzene ; 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 4 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 i (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 I; 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 GeoEnvironmentil, Inc.