Environmental

In Michigan, 'natural attenuation' as a remediation strategy means:

AInstalling a pump-and-treat system to remove contaminants
BRelying on natural biological, chemical, and physical processes to reduce contamination levels over time with monitoring✓ Correct
CDigging out all contaminated soil
DInstalling a physical barrier over contaminated soil

Explanation

Natural attenuation (monitored natural attenuation) relies on natural processes—biodegradation, dilution, dispersion, volatilization—to reduce contaminant concentrations to acceptable levels over time, with ongoing monitoring to verify progress. It is an accepted remedy under Michigan's Part 201 in appropriate situations.

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