Natural Recovery

• What is it?

< Natural attenuation of contaminant levels in biologically active zone

< Recovery of system- Not the sediments

< Generally driven by deposition of clean sediments – natural capping

• When is it appropriate?

< Large volumes of contaminated sediment with marginal level of contamination

< Low energy, depositional environments

< Dredging for navigation not required

< Outside of region subject to more active remediation

• What are the key assessment needs?

< Evaluation of operative processes and rates