Environmental
What is 'natural attenuation' in the context of contaminated site remediation in Idaho?
ANatural erosion of contaminated soil
BThe naturally occurring processes (biodegradation, dilution, dispersion) that reduce contaminant concentrations without active cleanup✓ Correct
CA government-mandated cleanup approach
DThe natural filtering of water through soil
Explanation
Natural attenuation (also called monitored natural attenuation) relies on natural processes — biodegradation, dilution, volatilization, sorption — to reduce contamination levels over time. Idaho DEQ may approve it as a cleanup remedy under certain conditions.
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