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Site Background Information : Stallworth Auto Sales Page 2 of 11 Figure 2 . After removal , laboratory analysis of soil samples collected from the floor of the UST excavations and dispensers areas detected total petroleum hydrocarbons as gasoline (TPH-g ) were reported in soil collected beneath the 3 , 000-gallon leaded UST at a concentration of 13 ,400 milligrams per kilogram (mg/kg ); BTEX compounds were reported at concentrations as high as 260 mg/kg . In addition , total petroleum hydrocarbons as diesel (TPH-d ) was reported in the soil sample collected beneath the diesel UST at a concentration of 29 mg/kg . Background concentrations of total lead were detected in soil samples P- 1 , P-2 , 3N and 3S . LUFT metals were detected in the soil sample collected beneath the former waste oil UST at concentrations as high as 50 mg/kg (zinc) . PREVIOUS SITE ASSESSMENT AND SAMPLING On 08 February2000 , three soil probe borings ( B- 1 through B-3 ) were advanced at the site as part of preliminary site assessment activities : • TPH-g was detected in soil samples analyzed from probe borings B- 1 through B-3 at concentrations as high as 12 , 000 milligrams per kilogram (mg/kg ), TPH-d was detected at concentrations as high as 4 , 900 mg/kg , and BTEX compounds were detected at concentrations as high as 1 , 900 mg/kg respectively. The highest benzene concentration encountered was 4 . 2 mg/kg . • One grab ground water sample collected from B- 1 was analyzed for TPH-g , TPH -d , BTEX and the suite of five fuel additives by EPA Method 8260 Modified . TPH-g and TPH -d were detected in the grab ground water sample at concentrations of 425 , 000 micrograms per liter (ug/1 ) and 9 , 900 lag/I , respectively. BTEX compounds were detected at concentrations of 15 , 000 pg/I , 48 , 000 pg/I , 3 , 200 pg/I , 55 , 000 pg/I , respectively. No fuel oxygenates were detected in the ground water sample analysis. On 23 and 24 May 2000 five ground water monitoring wells (MW- 1A, MW- 1 B and MW-2 through MW-4) were installed at the site . MW- 1A and MW-2 are screened from 30 feet to 50 feet bsg , and MW- 1 B , MW-3 and MW4 are screened from 20 feet to 40 feet bsg . • A total of 13 soil samples were analyzed for TPH-g , TPH -d , BTEX and the suite of five fuel additives by EPA Method 8260 Modified . • One TPH-g and TPH-d were detected in analyzed soil samples from boring MW- 1 B I Advanced CenEnvironlnentnl, Inc.