Rapid Assessment of Remedial Effectiveness and Rebound in Fractured Bedrock
Abstract
Fractured rock sites, impacted with chlorinated solvents such as tetrachloroethene (PCE) ortrichloroethene (TCE), remain a significant environmental challenge for the Department of Defense. Efforts to apply in situ remedial technologies, such as chemical oxidation or bio augmentation, have often proved challenging and/or unsuccessful with respect to attaining remedial objectives in fractured rock aquifers. Contaminant rebound typically is observed due to processes such as dense non-aqueous phase liquid (DNAPL) dissolution, matrix back-diffusion, and/or release of contaminants from low permeability/bypassed fracture zones. Unfortunately, the ineffectiveness of these remedial technologies is typically not recognized until after substantial time and resources have been expended via in situ pilot testing, and the mechanism(s) controlling the observed contaminant rebound often remain unidentified. This lack of understanding in the conceptual site model hinders effective site management, particularly with respect to designing an appropriate remedial approach and identifying the practical limits of remediation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 16, 2017
- Accession Number
- AD1052679
Entities
People
- Charles E Schaefer
- David Lippincott
- Harald Klammler
- Kirk Hatfield