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Site Background Information - Fernando's Place
<br /> AGE-NC Project No. 00-0769
<br /> Page 5 of 7
<br /> bsg, 115 feet to 120 feet bsg, 141 feet to 146 feet bsg, and 165 feet to 170 feet bsg.
<br /> Monitoring wells MW-4 and MW-5 were constructed with a fifth screened interval from
<br /> approximately 193 feet to 198 feet bsg.
<br /> A total of 28 soil samples were analyzed. The highest concentrations of petroleum
<br /> hydrocarbon compounds were detected from soil samples collected at between 40 feet and
<br /> 60 feet bsg, in HU-1 Middle Zone. TPH-g was detected in soil samples collected from soil
<br /> borings MW-4, MW-5, and B-2 at concentrations as high as 4,500 milligrams per kilogram
<br /> (mg/kg) (MW4-58), 3,600 mg/kg (MW5-50), and 2,000 mg/kg (62-50).
<br /> Benzene was detected in soil samples collected from MW-4, MW-5, and B-2 at maximum
<br /> concentrations of 33 mg/kg(MW4-58),21 mg/kg(MW5-50), and 20 mg/kg(B2-50);toluene
<br /> was detected at maximum concentrations of 180 mg/kg (MW4-58), 100 mg/kg (MW5-50),
<br /> and 54 mg/kg (132-50); ethylbenzene was detected at maximum concentrations of 19.5
<br /> mg/kg (MW4-58), 30 mg/kg (MW5-50), and 13 mg/kg (62-50); and total xylenes were
<br /> detected at maximum concentrations of 224 mg/kg (MW4-58), 182 mg/kg (MW5-50), and
<br /> 77 mg/kg (132-50).
<br /> The fuel additives DIPE, ETBE, MTBE,TAME, TBA, EDB and 1,2-DCAwere not detected
<br /> in the soil samples collected and analyzed from the three soil borings. Additional volatile
<br /> organic compounds(VOCs)detected in the analyzed samples included isopropyl benzene,
<br /> n-propylbenzene, 1,3,5-trimethylbenzene, 1,2,4-trimethylbenzene,p-isopropyl-toluene,and
<br /> naphthalene.
<br /> REMEDIATION WELL INSTALLATIONS
<br /> Between 21 and 22 February 2007, a total of six soil borings were advanced at the site to
<br /> vertical depths of 30 feet bsg. Borings SVE-1 through SVE-3 were advanced at the
<br /> southwest edge of the property, nearthe former UST No. 3 excavation area. Borings SVE-
<br /> 4 through SVE-6 were advanced in the northeast corner of the property, near the former
<br /> UST No. 1 and UST No. 2 areas. Between 14 and 16 March 2007, a total of four soil
<br /> borings were advanced at the site. Boring EW-1 was advanced at the southwest edge of
<br /> the property, near the former UST No. 3 excavation area, to a vertical depth of 50 feet bsg.
<br /> Borings EW-2, EW-3, and EW-4 were advanced in the northeast corner of the property to
<br /> vertical depths of 120, 50, and 50 feet bsg, respectively.
<br /> A total of twelve SVE soil samples were analyzed for the petroleum hydrocarbons
<br /> constituents. TPH-g were detected in soil samples collected from SVE-3 at 25 feet bsg
<br /> (SVE3-25) and SVE-4 at 25 feet bsg (SVE4-25) at concentrations of 2.5 milligrams per
<br /> kilogram (mg/kg) and 1.0 mg/kg, respectively. BTEX compounds were detected in soil
<br /> samples SVE4-25, SVE5-20 and SVE5-25 at maximum concentrations of 0.26 mg/kg
<br /> Advanced GeoEnvironmental,Inc.
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