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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 February 2000, 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 (Ng/1) and 9,900 pg/I, respectively. BTEX compounds were detected at concentrations of 15,000 pg/I, 48,000 tag/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-1B and MW-2 through MW-4)were installed at the site. MW-1 A and MW-2 are screened from 30 feet to 50 feet bsg, and MW-1 B, MW-3 and MW-4 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 Advanced Geo Environmental,Inc.