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| Resource Library > Technology Transfer > Programs and Initiatives > Source Zone Treatment > When To Avoid |
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When to Avoid
The following graphic can be found in the 1993 US EPA Guidance for Evaluating the Technical Impracticability of Ground water Restoration document. This figure illustrates those site-specific conditions that would inhibit or preclude effective NAPL source zone cleanup in a "reasonable" time frame (i.e. Technically impracticable). Thus, if your site specific parameters trend to the right side of this diagram, then you should avoid source removal attempts until a more detailed evaluation can be conducted. These more detailed evaluations would likely include:
- Are site characterization data sufficient to support a remedial alternative analysis?
- What is the risk of unacceptable contaminant spreading or exposure to remedial workers?
- Are there peer-reviewed case studies demonstrating successful source treatment at a comparable site(s)?
- Is a Technical Impracticabilty Waiver indicated?
- Use of an independent peer review panel of subject matter experts.
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Chlorinated solvents (red) in a basalt flow with transmissive interflow zones (Geology after Davis and DeWiest 1966)
This is a conceptual model for a site where NAPL source removal will be especially problematic or technically impracticable.
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