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• Optimizing the Design Features of the Funnel and Gate Groundwater Remediation Technology
  Start Date: 3/1/1998
  End Date: 3/31/2002  

Executive Summary

The funnel and gate groundwater remediation technology has received increased attention and application as an in situ alternative to the typical pump and treat system. Understanding the effects of heterogeneity on system performance can be the difference between a successful remediation project and a project that fails to meet its cleanup goals. In an attempt to characterize and quantify the effects of heterogeneity on funnel and gate system performance, a numerical modeling study of 15 simulated heterogeneous flow domains was conducted. Each realization was tested to determine if the predicted capture width met the capture width expected for a homogeneous flow domain with the same bulk properties. This study revealed that the capture width of the funnel and gate system varied significantly with the level of heterogeneity of the aquifer. Two possible remedies were investigated for bringing systems with less than acceptable capture widths to acceptable levels of performance. First, it was determined that enlarging the funnel and gate via a factor of safety applied to the design capture width could compensate for the capture width variation in the heterogeneous flow domains. In addition, it was shown that the use of a pumping well downstream of the funnel and gate could compensate for the effects of aquifer heterogeneity on the funnel and gate capture width. However, if a pumping well is placed downstream of the funnel and gate to control the hydraulic gradient through the gate, consideration should be given to the gate residence time in relation to the geochemistry of the contaminant removal or destruction process in the gate.
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• Design and Implementation of a GIS Geologic Data Base for Environmental Planning at the Savannah River Site (SRS)
  Start Date: 9/1/1994
  End Date: 9/30/1998  

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
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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  

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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• Aquifer Vulnerability and Contamination Potential Assessment at Marine Corps Air Station, Beaufort, SC
  Start Date: 3/21/2001
  End Date: 9/21/2003  

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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