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Site Background Information: Ralph's Square-Bui
<br /> AGE-NC Project No. 07-1537
<br /> Page 4 of 5
<br /> since 2002. The highest concentrations of dissolved hydrocarbons were detected at wells
<br /> MW-2 and MW-3, near the northeast and southeast corners of the former UST area. Low
<br /> concentrations of petroleum hydrocarbons and fuel additives were detected in well MW-1,
<br /> generally located up-gradient from the former UST area.
<br /> On 19 March, 20 March and 21 March 2008 five ground water monitoring wells (MW-7
<br /> through MW-11) were installed at the site; additionally one boring (135) was advanced at
<br /> the site. The newly installed wells were later surveyed on 29 April 2008.
<br /> During the March 2008 investigation, a total of thirty eight soil samples collected from pilot
<br /> borings MW7 through MW 11 and ten soil samples collected from soil probe boring B5 were
<br /> analyzed for the constituents listed in Sections 2.1.2. and 2.3, respectively. Constituents
<br /> of concern (COC) were detected in soil samples collected from pilot boring MW-11 and
<br /> from soil boring B5.
<br /> TPH-g was reported in soil samples collected from MW 11-20, MW 11-25, MW 11-30,
<br /> MW 11-35, MW 11-40, MW 11-45, MW 11-50, MW 11-75, and B5-20 at concentrations of
<br /> 3,800 milligrams per kilogram (mg/kg), 3,700 mg/kg, 220 mg/kg, 19 mg/kg, 5.0 mg/kg, 60
<br /> mg/kg, 2.0 mg/kg, 640 mg/kg, and 1 .2 mg/kg, respectively.
<br /> BTEX compounds were detected in soil samples collected from MW11-20, MW11-25,
<br /> MW 11-30, MW 11-35, MW 11-40, MW 11-45, MW 11-65, MW 11-75, MW 11-90, MW 11-98,
<br /> and B5-20:
<br /> • Benzene was reported in the soil samples collected from MW11-20, MW11-25,
<br /> MW 11-30, MW 11-35, MW 11-45, and MW 11-75 at concentrations of 2.1 mg/kg, 2.2
<br /> mg/kg, 0.58 mg/kg, 0.012 mg/kg, 0.076 mg/kg, and 0.078 mg/kg, respectively.
<br /> • Toluene was reported in the soil samples collected from MW11-20, MW11-25,
<br /> MW 11-30, MW 11-35, MW 11-75, and 135-20 at concentrations of 150 mg/kg, 260
<br /> mg/kg, 13 mg/kg, 0.14 mg/kg, 8.4 mg/kg, and 0.042 mg/kg, respectively.
<br /> • Ethylbenzene was reported in the soil samples collected from MW 11-20, MW 11-25,
<br /> MW 11-30, MW 11-35, MW 11-75, and 135-20 at concentrations of 190 mg/kg, 150
<br /> mg/kg, 6.0 mg/kg, 0.20 mg/kg, 11 mg/kg, and 0.013 mg/kg, respectively.
<br /> • Xylenes were reported in the soil samples collected from MW 11-20, MW 11-25,
<br /> MW 11-30, MW 11-35, MW 11-40, MW 11-45, MW 11-65, MW 11-75, MW 11-90,
<br /> MW 11-98, and B5-20 at a maximum concentration of 1,200 mg/kg (MW 11-20), 790
<br /> mg/kg, 31.7 mg/kg, 1.03 mg/kg, 1.03 mg/kg, 0.028 mg/kg, 1.78 mg/kg, 0.0048
<br /> mg/kg, 71 mg/kg, 0.036 mg/kg, 0.054 mg/kg, and 0.16 mg/kg, respectively.
<br /> Advanced GeoEnvironmental,Inc.
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