WORK PLANS - Laserfiche WebLink

Home Browse Search

u I � p Site Background Information: Stallworth Auto Sales Page 2 of 10 After removal, laboratory analysis of soil samples collected from the floor of the UST excavations and dispensers areas detected total petroleumhydrocarbons 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 collectedbeneath the formerwaste oil UST at concentrations as high as 50 mg/kg (zinc) . Analytical results of soil samples collected beneath the former USTs andpiping area are summarized in attached Tables Al and A2. PREVIOUS SITE ASSESSMENT AND SAMPLING On 08 February 2000, three soil probe borings (134 through 13-3) were advanced at the site as part of preliminary site assessment activities : l • 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 (µg/1) and 9,900 µg/1, respectively. BTEX compounds were detected at concentrations of 151000 µg/1, 48,000 µg/1, 3 ,200 µg/1, 55,000 µg/1, respectively. No fuel oxygenates were detected in the ground water sample analysis. On 23 and 24 May 2000 five ground water monitoring wells (MW-lA, MW-113 and MW-2 through MW-4) were installed at the site. MW- lA and MW-2 are screened from 30 feet to 50 feet bsg, and MW- 1B, 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- 1B at concentrations as high as 6, 100 mg/kg and 2,600 mg/kg, respectively. BTEX compounds ?' Advanced GeoEnvironmental, Inc. t�