ARCHIVED REPORTS XR0002713 - Laserfiche WebLink

Home Browse Search

F �� I h .lie• ,�, �i r F :'1 •i 'y t 13O July 2003 AGE-NC Projecf N6.:98-0504. r t , P.1.age 2'of,7 '2:3.; 'UNDERGROUND STORAGE TANK REMOVAL' Two USTs; dispenser island and associated piping were removed from the site on 22 September. 1998: Four samples were collected beneath the,USTs, one sample,was collected.beneath the' ` dispenser area and three laboratory-composited•soil samples were collected from the excavated soil. ' ' Methyl tertiary butyl ether (MTBE) and tertiary butanol (TBA) were detected, in" soil samples . collected from beneath the USTs and dispenser island'at concentrations up to 39 parts per million (ppm);total petroleum hydrocarbons,quantified as gasoline(TPH-g)we're detected at concentrations . . , u0o 1,400 ppm;and volatile aromatics(benzene,toluene,ethyl benzene and xylenes: BTEX)were 'detected at'concentrations up to 190 ppm. E osc 'Approximately 200 tons of soil,were excavated during removal of the USTs. 'After removal ofthe ; USTs was completed, the soil was placed back into the excavation because of strong hydrocarbon ` odors and the proximity'to a school. Two laboratory-composited samples were collected from the stockpiled soil prior to placement'into the excavation. TPH-g,'BTEX and MTBE',and TBA were all detected in the compositesamples. 2.4. SOM EXCAVATION PROCEDURES On 10 November 1998,approximately 25 0.yards ofhydrocarbon-impacted soilwere excavated from the location of the former UST system. Soil was excavated using a backhoe.with an approximate 15-foot reach capability.'Excavated soil was field-screened for the preserice of volatile organic compounds using an:OVM..Soil was stockpiled on the•eastern edge of the site:Approximately 150 , yards of"Soil was loaded:and transported to Forward Inc.Landfill under manifest for proper disposal on 1"O November 1999. An additional 100 yards.of impacted soil were transported-to Forward Inc. 1 Landfill'far disposal on,14 December 1999. ' Soil.samples collected from the floor and sidewails ofthe excavation were obtained using a,�ackhoe. A.total of nine soil samples were'collected from the''floor and sidewalls of the over-excavation. TPH-g was detected at concentrations up to 80 milligram'per kilogram(mg/kg)in the sampld.Nm the north wall, east end of the excavation. TPH-g was not detect in soil samples collected from the northwest,and east wall of the over excavation.'Additionall :TPH- south,n y, g,was not detected in the samples collected from the south end of the west wall and from the floor of the excavation. BTEX compounds were detected at concentrations up to 1.0 mg/kg,benzene was.only detected in the north west wall sample. MTBE and TBA were detected at concentrations up to 1.3 mg/kg and ' 8:9 mg/kg, respectively. MTBE.was detected at the highest concentrations in the northern portion of the over excavation, especially in the northern west wall sample,located at the northwest.edge of. Ir . the site under Monroe Avenue.Analytical results of soil samples are summarized in Tab ie's•1.and 2. h' i Advanced GeoEnvireninental,Inc