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| Resource Library > Technology Transfer > Programs and Initiatives > Monitored Natural Attenuation > When to Use or Avoid |
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When to Use
The following list presents conditions under which one should consider natural attenuation as the sole remedy:
- No receptors have been or will be impacted.
- Low to no risk exists from the contaminants present at a site.
- Contaminants of concern are biodegradable (most organic compounds are).
- Contaminant mass is being destroyed, typically via biodegradation.
Biodegradation of petroleum hydrocarbons is almost universal. Biodegradation of chlorinated solvents depends on site specific biogeochemical conditions.
Because of this, AFCEE prepared a
biodegradation screening
system which was subsequently published by the
USEPA (1998).
- The results of a cost-benefit analysis indicate that natural attenuation is cost effective (it usually is)
When to Avoid
The following list presents conditions under which one should proceed with caution or exclude natural attenuation from further consideration as the sole remedy:
- Regulations do not allow for natural attenuation.
- Receptor pathways have been completed.
- Receptor pathways are likely to be completed.
- The results of a cost-benefit analysis indicate that natural attenuation is not cost effective.
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