Abstract

As specified by the U.S. Environmental Protection Agency (USEPA, 1999), the term “monitored natural attenuation … refers to the reliance on natural attenuation processes … to achieve site-specific remediation objectives within a time frame that is reasonable compared to that offered by other more active methods. The ‘natural attenuation processes’ that are at work in such a remediation approach include a variety of physical, chemical, or biological processes that, under favorable conditions, act without human intervention to reduce the mass, toxicity, mobility, volume, or concentration of contaminants in soil or groundwater. These in situ processes include biodegradation; dispersion; dilution; sorption; volatilization; radioactive decay; and chemical or biological stabilization, transformation, or destruction of contaminants. When relying on natural attenuation processes for site remediation, EPA [U.S. Environmental Protection Agency] prefers those processes that degrade or destroy contaminants.”

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