The guide encourages project managers to consider a mix of remedies, including dredging and disposing of sediment; capping it to limit further contamination; or allowing natural attenuation to let chemical contaminants in soil or groundwater to degrade naturally. The final document includes new language encouraging project managers to conduct more analyses and consider more sources of uncertainty regarding the overall contamination of a site. In the final guide the language included directions to take steps to cap contaminants "sufficient" to protect the environment.
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