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Questions & Answers


What about NAPL mobilization with injections? Do you recommend having hydraulic control (a P&T system) to prevent potential contaminant mobilization from moving off-site?

Answer

As part of the Regenesis Remediation Services’ design process, we evaluate the potential of hydraulically pushing the plume and mobilizing NAPL. One of the items we carefully consider is the injection volume compared to total and effective porosity of the aquifer or saturated soils in a perched water bearing zone. Since even our high volume application remediation technologies typically do not fill even 40% of the effective pore volume, pushing plumes and NAPL on sites has not been a phenomenon observed on sites using Regenesis designed applications.

Depending on the remediation technology we are using and site conditions, we combine groundwater extraction with the injection operations. This can be used to enhance distribution of the injected remediation chemistry, extract free-phase product you intend on mobilizing, or both. Additionally, RRS typically begins injections on sites with confirmed or suspected NAPL by applying the remediation chemistry from the perimeter of the plume and progressing to the injection points in the hot spot(s) or source areas towards the end of the injection event. Especially for in situ chemical oxidation applications, this creates a reactive zone along the perimeter of the plume to help remediation more contaminant mass that might have been mobilized.