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Natural Attenuation

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The Natural Attenuation documents provide a framework for thinking about natural attenuation based on science, focusing on the basic information needed to determine and document the conditions necessary for natural processes to be an effective part of remediating contaminants in groundwater.
The Attenuation Processes for Metals and Radionuclides document facilitates implementation of the new EPA guidance for monitored natural attenuation (MNA) of metals and radionuclides with a framework providing a consistent basis for states, stakeholders, federal agencies, and site owners to evaluate and implement attenuation-based remedies.
The Bioremediation of DNAPLs (BioDNAPLs) documents address the selection and design of in situ bioremediation (ISB) systems for chlorinated ethene DNAPL source zones, as well as technical and related regulatory considerations.
The Enhanced Attenuation: Chlorinated Organics (EA) document provides direction to regulators and practitioners on integrating EA into remedial decision making for a smooth transition between aggressive remediation and monitored natural attenuation.
The Enhanced In Situ Biodenitrification (EISBD) document addresses nitrate-contaminated groundwater, associated with environmental and health problems and an emerging technology for remediating and protecting public and domestic supply wells.
The In Situ Bioremediation (ISB) documents address the systematic characterization, evaluation, and appropriate design and testing of ISB for biotreatable contaminants.
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