...(“natural attenuation”) faster and more completely than by engineering approaches. EPA defines natural attenuation as “the biodegradation, dispersion,...are protective of human health and the ecosystem”. Reliance on natural attenuation is not a do-nothing ducking of responsibility; nor is it a walk-away...

...contaminants in an aquifer. Natural attenuation, according to a definition proposed by the US EPA, is “the biodegradation, dispersion, dilution, sorption,...are protective of human health and the ecosystem.” 53 The retardation factor (R) describes the reduction in the rate of transport of a dissolved contaminant...

...“natural attenuation” as: The biodegradation, dispersion, dilution, sorption, volatilization, and! or chemical and biochemical stabilization of contaminants...are protective of human health and the ecosystem. As part of this definition, abiotic oxidation and hydrolysis are also attenuation mechanisms that destroy...

...dispersion, dilution, sorption, volatihisation, and/or chemical and biochemical stabihisation ofcontaminants to effectively reduce contaminant toxicity, mobility,...levels that are protective of human health and the Physical Chemical Biological Dilution Gas dissolution/exsolution Aerobic degradation Dispersion Precipitation...

...dispersion, dilution, sorption, volatilisation, and/or chemical and biochemical stabihisation ofcontaminants to effectively reduce contaminant toxicity, mobility, or volume to levels that are protective ofhuman health and the 10 Many processes combine to achieve natural attenuation and these can be grouped...

...volatilization and/or chemical and biochemical stabilization of contaminants, that effectively reduce toxicity, mobility or volume to levels that are protective of human health and the environment. The key elements determining the fate and hence the NA of most chemicals suspected of...