Characterization Activities to Determine the Extent of DNAPL in the Vadose Zone at the A-014 Outfall of A/M Area

Jackson, D. R.

doi:10.2172/762017

Cited by 12 publications

(21 citation statements)

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“…The fine-grained units at 50-ft and 80-ft depths correspond to the "300-ft [msl] clay" and "270-ft clay" units described in Eddy et al (1991) and Jackson et al (1999). The 37 latter is also known as the "Tan Clay."…”

Section: Overviewmentioning

confidence: 99%

Integrated Geophysical Detection of DNAPL Source Zones

CO¹

2001

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503 AGENCY USE ONLY (Leave blank) REPORT DATE November 28,2001 REPORT TYPE AND DATES COVERED Final Report TITLE AND SUBTITLE Integrated Geophysical Detection of DNAPL Source Zones AUTHOR(S)Blackhawk Geoservices, Inc. FUNDING NUMBERS N/A PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Blackhawk Geoservices SUPPLEMENTARY NOTESNo copyright is asserted in the United States under Title 17, U.S. code. The U.S. Government has a royalty-free license to exercise all rights under the copyright claimed herein for Government purposes. All other rights are reserved by the copyright owner. 12a. DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release: distribution is unlimited. 12b. DISTRIBUTION CODE A ABSTRACT (Maximum 200 Words)Identification of subsurface organic contamination, particularly dense nonaqueous phase liquids (DNAPLs) is one of the highest priorities -and among the most difficult -for remediation of numerous sites, including those of the DOD and DOE. Complex resistivity (CR) is the only geophysical method that has been demonstrated in the laboratory to have high sensitivity to organic compounds, by detecting responses indicative of clay-organic electrochemistry. However, direct detection of organics in the field has been elusive, in part due to the difficulty of obtaining robust measurements at very low contaminant levels in the presence of heterogeneous geological materials and cultural interference (such as metallic utilities and remediation plumbing). This project sought to improve the capability to detect DNAPL by (1) better geophysical imaging of geological pathways that control DNAPL movement and (2) direct detection by detailed comparison of CR lab to field data using this improved imaging. For the first goal, algorithms were developed for the joint tomographic imaging of seismic and resistivity data. The method requires that an empirical relationship can be established between seismic and resistivity; if values are ultimately tied to specific lithologies, then the final tomographic product can be an actual geological cross-section. Because shallow subsurface investigations are now commonly performed using a cone penetrometer (CPT)a new vibratory seismic source was developed to identify sites with clay-organic reactions measurable in the lab from core samples, perform reconnaissance field surveys, and proceed to det...

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Section: Overviewmentioning

confidence: 99%

Integrated Geophysical Detection of DNAPL Source Zones

CO¹

2001

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“…The outfall feeds an unamed tributary of Tim's Branch, which flows into Upper Three Runs Creek and eventually discharges to the Savannah River. In 1979 solvent discharges to the process sewer ended (Jackson et al, 1999). The A-014 Outfall currently receives stormwater runoff and water from a groundwater pump and treat system (M1 Stripper).…”

Section: Introductionmentioning

confidence: 99%

“…Discharges of sodium hydroxide wastes totaled 23,700 pounds in weekly batches of 380 pounds and monthly batches of 300 pounds. Although these chemical concentrations were reported as 100%, they most likely were discharged at more dilute concentrations (Jackson et al, 1996;Jackson et al, 1999). Available disposal information gives some insight into the magnitude and variety of waste streams at A/M-Area.…”

Section: Introductionmentioning

confidence: 99%

“…Various characterization studies and investigations have been conducted since soil and groundwater contamination was first identified in the A/M-Area in 1981 (Marine and Bledsoe, 1984;Pickett et al, 1987;Looney et al, 1992;Jackson et al, 1996;Jackson et al, 1997;Jackson et al, 1999;Jerome et al, 1999;Jackson et al, 2000;Vangelas, 2000). Remediation strategies have been developed and applied to meet the needs and remediation goals of the various parts of the DNAPL plume in the A/M-Area.…”

Section: Introductionmentioning

confidence: 99%

“…Beginning in 1987 soil vapor extraction was implemented in various stages for vadose remediation within A/M Area (Jackson et al, 1999). During the first year of operation more than 39,000 pounds of solvent were removed by the soil vapor extraction units (Jackson et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

DOE-EMSP Final Report: Characterization of Changes in Colloid and DNAPL Affecting Surface Chemistry and Remediation

Powers¹,

Grimberg²,

Denham³

2007

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Three‐dimensional self‐potential inversion for subsurface DNAPL contaminant detection at the Savannah River Site, South Carolina

Minsley

Sogade

Morgan

2007

Water Resources Research

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[1] Self-potential (SP) data are collected over an area of approximately 250 m 2 at the Department of Energy Savannah River Site where there is known subsurface dense nonaqueous phase liquid (DNAPL) contamination. Nonpolarizing electrodes are used to measure the SP signal on a two-dimensional (2-D) surface grid with 2-m spacing in both horizontal directions, and four borehole arrays with 3.7-m electrode spacing and 25.6-m total depth. The primary contaminants, tetrachloroethylene (PCE) and trichloroethylene (TCE), are known to undergo redox reactions in the environment. Variations in the subsurface redox conditions are proposed as an electrochemical source for the SP signals measured in this investigation. A 3-D self-potential inversion algorithm is used to find an electrical current source model, taking into account the resistivity structure derived from a 3-D spectral induced polarization survey at the same field location. The sources and sinks of electrical current can be related to the zones of relative high or low redox potential and are therefore interpreted in the context of contaminated areas. These results are reasonably correlated with DNAPL concentration data obtained from several ground-truth well measurements, indicating that the SP sources can be an indicator of contaminated areas where electrochemical source mechanisms are active. In several cases, however, the SP sources and contaminant concentrations are not correlated, reflecting the spatial variability of biogeochemical parameters in the Earth that control the SP response in addition to concentration. More extensive geochemical ground-truth information is therefore needed to validate the self-potential source inversion methodology and develop it as a predictive tool in the context of contaminated sites.

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Characterization Activities to Determine the Extent of DNAPL in the Vadose Zone at the A-014 Outfall of A/M Area

Cited by 12 publications

References 3 publications

Integrated Geophysical Detection of DNAPL Source Zones

Integrated Geophysical Detection of DNAPL Source Zones

DOE-EMSP Final Report: Characterization of Changes in Colloid and DNAPL Affecting Surface Chemistry and Remediation

Three‐dimensional self‐potential inversion for subsurface DNAPL contaminant detection at the Savannah River Site, South Carolina

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