|
M
<br /> Site Background Information - Fernando' s Place
<br /> AGE-NC Project No. 00-0769
<br /> Page 2 of 5
<br /> the CPT borings, AGE identified four potential hydrogeologic units (First Water Zone, Second Water
<br /> Zone, Third Water Zone, and Fourth Water Zone). Significant concentrations of TPH-g, BTEX, and
<br /> 1 ,2-DCA compounds were detected in grab ground water samples collected from each of the
<br /> hydrogeologie units.
<br /> INSTALLATION OF ADDITIONAL MONITORING WELLS
<br /> Between, 27 August and 10 October 2002, the site assessment scope advanced seven soil borings
<br /> for the collection of soil samples and/or the installation of monitoring wells (MW-4 through MW-9).
<br /> Screen intervals were installed at the following intervals: 20 feet to 40 feet bsg, 115 feet to 120 feet
<br /> bsg, 141 feet to 146 feet bsg, and 165 feet to 170 feet bsg. Monitoring wells MW4 and MW-5 were
<br /> constructed with a fifth screened interval from approximately 193 feet to 198 feet bsg.
<br /> A total of 28 soil samples were analyzed. The highest concentrations of petroleum hydrocarbon
<br /> compounds were detected from soil samples collected at between 40 feet and 60 feet bsg, in HU-1
<br /> Middle Zone. TPH-g was detected in soil samples collected from soil borings MW4, MW-5, and
<br /> 13-2 at concentrations as high as 4,500 milligrams per kilogram (mg/kg) (MW4-58), 3,600 mg/kg
<br /> (MW5-50), and 2,000 mg/kg (132-50).
<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 (132-50); toluene was
<br /> detected atmaximum concentrations of 180 mg/kg (MW4-58), 100 mg/kg (MW5-50), and 54 mg/kg
<br /> (132-50); ethylbenzene was detected at maximum concentrations of 19 .5 mg/kg (MW4-58), 30 mg/kg
<br /> (MW5-50), and 13 mg/kg (132-50); and total xylenes were detected at maximum concentrations of
<br /> 224 mg/kg (MW4-58), 182 mg/kg (MW5-50), and 77 mg/kg (132-50).
<br /> The fuel additives D1PE, ETBE, MTBE, TAME, TBA, EDB and 1 ,2-DCA were not detected in the
<br /> soil samples collected and analyzed from the three soil borings. Additional volatile organic
<br /> compounds (VOCs) detected in the analyzed samples included isopropylbenzene, n-propylbenzene,
<br /> 1 ,3,5-trimethylbenzene, 1 ,2,4-trimethylbenzene, p-isopropyl-toluene, and naphthalene.
<br /> CONTINUED SITE ASSESSMENT
<br /> On 07 through 09 June 2006, two soil borings, CPT-07 and CPT-08, were advanced on-site utilizing
<br /> CPT technology to characterize the geological and hydro-geological framework and to achieve
<br /> vertical definition of the petroleum hydrocarbon impacted soil and ground water. A total of two (2)
<br /> discrete soil samples were collected from boring CPT-08 and submitted for laboratory analysis for
<br /> the aforementioned constituents; soil samples were collected from CPT-08 at depths of 175 feet and
<br /> Advanced GeoEnvironmenlal, Inc.
<br />
|