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Reactive Transport in 3-Dimensions

Project Summary – MNA Evaluation for the Brooklawn Site

Overview

Battelle PNWD provided a range of technical services to evaluate monitored natural attenuation as a potential remedial alternative at the Brooklawn site in Baton Rouge, Louisiana.  The RT3D reactive transport code was used to predict contaminant fate and transport as part of this evaluation.  The bioremediation team, following U.S. EPA guidelines, evaluated the lines of evidence that are required to support a decision to use monitored natural attenuation at the site.

The Site

The Brooklawn site is located north of the city of Baton Rouge, Louisiana and approximately one mile away from the Mississippi River.  The Brooklawn site is located at the interface between Pleistocene sedimentary deposits (clay material with occasional silt/sand lenses) and the recent alluvial sediments bordering the Mississippi River (typically interlayered silt, sand, and clay deposits).  Hydraulic gradients at the site vary significantly over time and are controlled by fluctuations in the Mississippi River stage.

It is estimated that approximately 160,000 tons of non-aqueous phase liquid (NAPL) contaminants were disposed at the Brooklawn site.  NPC Services, Inc. is currently applying hydraulic containment and source recovery at the site.  Based on the results of NPC Services Inc.'s efforts, with technical support from Battelle PNWD, monitored natural attenuation (MNA) has been selected as the preferred option for addressing the dissolved chlorinated solvent plume.   The MNA approach is replacing the previous pump-and-treat system at the site.

Figure depicting the source areas and extent of the contaminant plume at the Brooklawn site.

Conceptual model of lateral contaminant distribution.  Figure depicting the source areas and extent of the contaminant plume at the Brooklawn site.

Aerial view of the Brooklawn site.

Aerial view of the Brooklawn site. 

The Scope

Battelle was contracted to evaluate lines of evidence for MNA and support the client in the use of the RT3D code to develop a numerical reactive transport model for the site.  Several tasks were required for this effort:

  • MNA Screening Assessment:  Perform an initial screening assessment of natural attenuation potential at the site per U.S. EPA guidelines.
  • Microcosm Tests:  Evaluate the degradation sequence and reaction rates for chlorinated ethane biodegradation at the site under natural attenuation conditions.
  • Modeling Support:  Develop the necessary reaction routines and provide technical support in setting up and calibrating the site model.
  • Groundwater Monitoring Guidance:  Provide input to monitoring plans with respect to meeting U.S. EPA guidelines for MNA.

The Result

The project was successfully completed in August, 2001.  Battelle PNWD provided technical support to NPC Services Inc. for submittal of a revised remediation approach at the site to the Environmental Protection Agency.  The assessment concluded that the dissolved-phase plume will stabilize and stop migrating before reaching the compliance location.  A long-term monitoring plan was proposed to meet the requirements for implementation of MNA as the selected remediation approach.

With Battelle PNWD's technical support, NPC Services Inc. has gained regulatory approval for implementing the revised remediation approach at the site.  A significant cost savings will be realized from this change.

Contact Information

Battelle PNWD integrates geological, hydrological, biological, and environmental data to evaluate, design, simulate, and/or optimize remediation systems, applying RT3D as a design/evaluation framework where appropriate.

For more information on this project and/or our services, contact:


Program Manager
Environmental Systems Group
Battelle
902 Battelle Blvd., K6-96
Richland, WA 99352
USA
509-371-7072
509-371-7174 FAX

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