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<br /> u y UNDERGROUND STORAGE TANK REMOVAL , 4 r, i' �'•.,f�I
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<br /> . . On 22 September 1998,two USTs,the dlspenser Island;:and associated piping were remo
<br /> 'the site b'y,SSSE: Four soil sample`s were collected f ni-beneath`the USTs, one soil,samp.k was,",:
<br /> _ • collected from eneath the dispenser area, and ahree°laboratory-three, .soil samples,.were
<br /> collectedfrom the excavated soil and submitted,for laboratory analysis.
<br /> MTBE and tertiary butanol (TBA)were detected in soil samples collected from-beneath the USTs
<br /> ".—and dispenser`island.at'concentrations•as high as'39•milligrams.per kilogram'(mg/kg);;.TPH-g Was
<br /> ;detected at`conceritrations as high as 1,,400 mg/kg;and benzene,toluene;ethylbenzene;and xylenes
<br /> {BTEX) were detected at concentrations as•high as-190 mg/kg: E `'
<br /> Approximately 200 tons'of soil were excavated during the removal of the USTs.'After the removal
<br /> was. completed, the soil was placed back•into the excavation-becauseyof.the presence of strong,'
<br /> hydrocarbon odor and the.proximity of the excavation to.4 school. Two.laboratory-composited 1 +
<br /> samples were collected from the stockpiled soil prior to replacement into the excavation: TPH;g,'"
<br /> BTEX, MTBE, and TBA were all detected in the composite samples.
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<br /> SOIL EXCAVATION PROCEDURES
<br /> On.10 November 1998,-approxiniately250 yards ofhydrocarbon-impacted soil were excavated from' `
<br /> the location ofthe former UST system using'a backhoe with an approximate 15"foot reach capability.
<br /> The excavated soil was stockpiled on the eastern edge of the site and field-screened for.thepresence .
<br /> of volatile organic compounds using an organic vapor.meter(OVM). Subsequently, approximately„
<br /> 150 yards of soil was loaded and transported-to Forward 1[4c. Landfill under manifest forl'proper ;
<br /> disposal on 10 November 1999: Art' additional.100 yards of impacted soil were transported.:to T
<br /> Forward Inc. Landfill for disposal`on 1'4'December 1999: = '
<br /> -A total of nine soil samples were collected from the floor and sidewalls'of the.over-excavation forio
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<br /> laboratory analysis:TPH-g was detected at concentrations up to 80 mglkg in the sample from the east; ;
<br /> end of the north wall of the excavation.'TPH-g was not detected in soil samples collected from the
<br /> south'
<br /> northwest,and east wall of the aver-excavation.Additionally,TPH-g was not detected in the I
<br /> ' samples collected from the'south end of the west wall or the floor of the'excavation. "`
<br /> r BTEX compounds were'detected at concentrations'up to 1.0 mg/kg; benzene was only detected Irl.' '
<br /> the north west wall-sam" ple. MTBE and TBA were detected at concentrations as higli'as',1.3'mg/kg
<br /> and 8.9 mg/kg,'respectively- the highest concentrations,of MTBE were+detected in:the'northern ; r
<br /> 1,•r , portion of the over excavation, especially in-the'.northwestern wall sample(Tables 1• and 2).
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