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Site Background Information : Stallworth Auto Sales Page 3 of 11 at concentrations as high as 6 , 100 mg/kg and 2 , 600 mg/kg , respectively. BTEX compounds were detected in boring MW- 1 B soil samples at concentrations as high as 16 mg/kg, 220 mg/kg , 67 mg/kg and 360 mg/kg , respectively. Toluene was detected in the ' 25-foot soil sample collected from MW-2 at a concentration of 0 . 0085 mg/kg . • Fuel oxygenates were not detected in the soil samples analyzed . • After the installation and development of the five ground water monitoring wells on- site , each well was sampled . The ground water samples were analyzed for the suite of five fuel additives and , with the exception of MW- 1 B , for TPH-g , TPH-d and BTEX. • TPH-g was detected in the ground water samples collected from monitoring wells MW- 1A, MW-2 and MW-3 at a maximum concentration of 380 , 000 pg/I ( MW- 1A) . TPH-d was detected in the groundwater sample collected from monitoring well MW- 1A at a concentration of 13 , 000 pg/I . The highest concentration of hydrocarbon- impacted ground water resides in the area of the former USTs. • BTEX compounds were detected in the water samples analyzed from MWAA, MW- 2 and MW-4 at concentrations as high as 3 , 000 pg/l , 100 , 000 pg/I , 6 , 500 pg/I and 323000 pg/I , respectively. Fuel oxygenates were not detected in the ground water samples analyzed . i IOn 20 November 2001 , one soil boring ( CPT-1 ) was advanced on-site utilizing CPT technology to model the geological and hydrogeologic framework and to assess potential dissolved petroleum-migration pathways beneath the site . Lithologic data was collected from the boring . A twin boring was then advanced to collect grab ground water samples i from selected depths. • Groundwater samples were collected from CPT- 1 at the following intervals : 71 feet to 74 feet bsg , 104 feet to 106 feet bsg , 126 feet to 129 feet bsg and 145 feet to 148 feet bsg . • TPH-g was detected in all fourwater samples collected at concentrations of 16 , 000 micrograms per liter ( pg/1 ) , 500 pg/l , 460 pg/I and 140 , 000 pg/l , respectively. TPH-d was detected in three of the water samples collected at concentrations as high as 40, 000 pg/1 . • BTEX compounds were detected in all the water samples collected at concentrations as high as 560 pg/I benzene, 12 , 000 pg/I toluene , 3 , 000 pg/I ethylbenzene and 15 , 000 pg/I total xylenes . • DIPE was detected in the water sample collected from 126- 129 feet bsg at a concentration of 1 .4 pg/1 . EDB was detected in the sample collected from 145- 148 ' feet bsg , at a concentration of 86 pg/I . 1 , 2-DCA was detected in the water samples j Advanced CeoEnvironmental, Inc. i c