ARCHIVED REPORTS_XR0008307 - Laserfiche WebLink

Home Browse Search

• 22 June 2001 AGE-NC Project No 01-0839 Page 2 of 7 2 2 UNDERGROUND STORAGE TANK REMOVAL On 05 January 1999, one 12,000-gallon fuel UST and two 10,000-gallon fuel USTs, were removed from the site by Henderson Construction of Stockton, California A representative of Touchstone Developments was present on-site to observe field activities and to collect soil samples The approximate locations of the former USTs are shown on Figure 2 Soil samples were collected beneath the former USTs at depths of 14 to 16 feet below surface grade (bsg),beneath the product dispensers at 3 feet bsg, beneath the product piping at depths of 3 5 to 4 feet bsg and from the stockpiled soil excavated from the UST excavation Soil samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), volatile aromatic compounds - benzene, toluene, ethylbenzene and total xylenes (BTEX), and fuel oxygenates - di-isopropyl ether (DIPE), ethyl-tertiary butyl ether (ETBE), methyl-tertiary butyl ether (MTBE), tertiary-amyl methyl ether(TAME) and tertiary butanol (TBA) The three USTs were located at the southeast end of the site During the UST removals, a total of seven soil samples (1T through 3T), two from beneath each 10,000-gallon UST and three from . beneath the 12,000-gallon UST were collected from the floor of the UST excavation A total of nine soil samples, one from beneath each product dispenser(DI through D-5) and one beneath every 20 linear feet of product piping(PI through P4)were collected Also, four two-part composite samples (SP-1 through SP-4) were collected from the soil stockpile TPH-g was detected in three of the seven soil samples collected beneath the former USTs at concentrations of 1 0 mg/kg (ITC-15 5), 2,300 mg/kg (2TW-15 5) and 1 1 mg/kg (3TW-15 5) TPH-g was also detected in one of the five soil sample collected beneath the product dispensers at a concentration of 17 mg/kg (D2-3) and in one of the four samples from the stockpiled soil at a concentration of 1 0 mg/kg (SP-1) Toluene, ethylbenzene and total xylenes were detected in UST sample 2TW-15 5 at concentrations of 1 1 mg/kg, 8 4 mg/kg and 70 mg/kg, respectively Toluene and total xylenes were detected in soil sample P44 at concentrations of 0 005 mg/kg and 0 016 mg/kg, respectively MTBE was detected in 15 of the 20 soil samples collected during the UST removal activities at concentrations as high as 17 mg/kg (D2-3) TBA was detected in soil sample ITE-15 5 at a concentration of 1 3 mg/kg and in all four stockpile soil samples at concentrations as high as 0 67 mg/kg A summary of soil analytical results are presented in Table 1 Advanced GeoEnviranmental,Inc