Aquifer Vulnerability and Contamination Potential Assessment at Marine Corps Air Station, Beaufort, SC

 Start date: 3/21/2001

End date: 9/21/2003   

Status: Completed

Executive Summary

This study is executing a comprehensive aquifer vulnerability and contamination potential assessment (VCPA) at the Marine Corps Air Station, Beaufort (MCAS) with the results of the assessment integrated into the installation’s Geographic Information System (GIS). The objective of the integration, which merges environmental and infrastructure GIS, is to facilitate the development of risk management plans, fulfill regulatory reporting requirements, and aid in answering public enquiries concerning environmental issues within and surrounding the MCAS. This project correlates pertinent environmental data already held by the MCAS and new information collected by this study to create a comprehensive, site-wide model of the groundwater, surface water and hydrogeology of the air base.

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Application of Geophysical Techniques to Site Characterization and 3D Visualization

 Start date: 1/1/1998

End date: 12/31/2002   

Status: Completed

Executive Summary

ESRI is providing geophysical expertise and oversight to Argonne National Laboratory's (ANL) QuickSiteSM investigations of subsurface DNAPL contamination at former USDA Commodity Credit Corporation grain storage sites in the Midwest. At these sites materials used to fumigate grain decades ago are the cause of DNAPL contamination. The DNAPL, commonly carbon tetrachloride, migrates through the overlying glacial sediments and accumulates on clay layers and atop the bedrock surface at depths to 100 feet. Insofar as many CCC sites were located within or near town limits, the potential for contamination of public drinking supplies is high. Because the geological characteristics of the glacial overburden are laterally and vertically variable, geophysical methods are needed to detect and map buried channels and other heterogeneities that might influence contaminant transport.

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Seismic DNAPL Detection at 200 West Area, USDOE Hanford Site

 Start date: 10/1/1998

End date: 12/31/2002   

Status: Completed

Executive Summary

The goal of the seismic reflection research was to determine whether high concentrations of DNAPL (CCl4) in the subsurface at 200 West Area could give rise to seismic amplitude anomalies. If such amplitude anomalies exist, the distribution can be mapped and calibrated versus borehole measurements. A secondary goal was to map the subsurface geology and delineate probable preferential pathways for DNAPL transport.

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Development of a Contamination Potential Map for a Portion of the General Separations Area, Savannah River Site, SC

 Start date: 9/1/1994

End date: 9/30/1998   

Status: Completed

Executive Summary

Geographic Information System (GIS) methodology has been developed to evaluate and map the "contamination potential" or aquifer sensitivity of the upper groundwater flow system at DOE’s Savannah River Site in southwestern South Carolina. The integration of diverse subsurface and soils information is possible using a stack-unit mapping approach. This is the first time that a stack-unit mapping approach, developed in the Midwest for mapping glacial sediments, has been used to delineate geologic materials in a coastal plain environment. Surface elevation contour maps were constructed for the tops of six Tertiary units based on over 200 boring logs.

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Seismic DNAPL Detection at M-Area Seepage Basin USDOE Savannah River Site 1995-1997

 Start date: 1/1/1995

End date: 12/1/1997   

Status: Completed

Executive Summary

This project tests the feasibility of using high-resolution seismic techniques and direct hydrocarbon indicator analyses to image free-phase and dissolved phase DNAPLs at the M-Area seepage basin, USDOE Savannah River Site, South Carolina. Another objective is to map the subsurface geology and determine the geologic controls on the distribution of the DNAPL plume.

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Seismic Reflection Investigation of the Crackerneck Fault: Post-Cretaceous Faulting in Atlantic Coastal Plain Sediments at the Savannah River Site, SC

 Start date: 1/1/1996

End date: 1/1/1997   

Status: Completed

Executive Summary

High resolution vibroseis seismic reflection data were collected during 1996 to investigate the Crackerneck fault, a southeast dipping high-angle reverse fault known to originate within the crystalline basement and offset overlying Cretaceous age Coastal Plain sediments in the A and M areas of the northwestern part of Savannah River Site, near Aiken, S.C. The seismic survey, comprised of 8 profiles, was designed to image from top-of-basement (approx. 300 m) to the Tertiary age Ellenton-Congaree Formations (approx. 100-50 m) to enable detailed mapping of the Crackerneck fault and associated structures.

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