Monitored natural attenuation definition

Monitored natural attenuation means representative groundwater monitoring of the natural attenuation of each substance in a groundwater plume to a concentration equal to or less than groundwater criteria, provided such monitoring demonstrates that:

Monitored natural attenuation means the reliance on natural attenuation processes, within the context of a carefully controlled and monitored site cleanup approach, to achieve site-specific remediation objectives within a time-frame that is reasonable compared to that offered by other more active methods.

Monitored natural attenuation means a methodology for remediation that relies upon a variety of naturally occurring chemical, physical and biological processes to achieve target concentrations in a manner that is equally as protective of public health, safety and welfare, and the environment as other methods, and that is accompanied by a program of monitoring to document the progress and results of the above-mentioned processes.

Examples of Monitored natural attenuation in a sentence

• Monitored natural attenuation is another response action that may be effective in certain situations.

• Monitored Natural Attenuation Monitored natural attenuation (MNA) refers to the reliance on natural processes to achieve site- specific remediation objectives within a reasonable timeframe.

• Monitored natural attenuation (MNA) is a technically feasible and cost-effective remedial action for many chlorinated solvent groundwater plumes.

• Monitored natural attenuation may be considered as an alternative to continuing active remediation, once the remedial goals of a project have been met, such as source area reduction or contaminant migration stabilization.

• Monitored natural attenuation (MNA) is a specific remedial strategy which collects additional data such as pH, dissolved oxygen (DO), and oxygen reduction potential (ORP) to quantify the rates and mechanisms that are limiting the extent and/or concentration of contamination.

More Definitions of Monitored natural attenuation

Monitored natural attenuation means remediation by natural attenuation that is monitored to determine achievement of remediation goals over a specified time period.

Monitored natural attenuation. [MNA] means the use of natural attenuation processes in a carefully controlled and monitored approach to site remediation.

Monitored natural attenuation means an approach to the reduction in the concentration of chemicals of concern in environmental media due to naturally occurring physical, chemical, and biological processes.

Monitored natural attenuation means a remediation process that closely monitors the natural or enhanced attenuation process.

Monitored natural attenuation or “MNA” means the collection of samples on an annual or semiannual basis from monitoring wells associated with SWMUs and AOCs. The purpose of MNA is to demonstrate that contaminant concentrations are decreasing due to one or more natural processes in the subsurface. If MNA shows no decreases in contaminant concentrations or that they are increasing, the Secretary may evaluate whether changes to the corrective measure or a new corrective measure is necessary.

Monitored natural attenuation means the reliance on natural attenuation processes, within the context of a carefully con- trolled and monitored site cleanup approach, to achieve site- specific remediation objectives within a time-frame that is rea- sonable compared to that offered by other more active meth- ods.

Monitored natural attenuation means natural attenuation is demonstrated by a reduction in hydrocarbon mass and concentration over time, the presence of biodegradation by-products and the presence of hydrocarbon utilising bacteria.