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Historic activities at an active manufacturing facility contaminated a sand aquifer with
chlorinated solvents (primarily perchloroethene, PCE). Previous remediation activities
included an extensive pump and treat system as well as other in situ activities. The
cost of operating the pump and treat system was such that the client looked for a
more cost-eff ective remediation approach. Regenesis Remediation Services (RRS)
combined bioremediation/in situ chemical reduction (ISCR) approach proved to be
cost-eff ective as a replacement technology for the pump and treat system, saving the client
more than $200,000 per year. This remediation solution was installed both inside and outside
of the manufacturing facility during winter in sub-zero temperatures.
Four treatment rows of a total 48 injection points were used to apply the product with a
treatment area of 5-30 feet below ground surface.
The following in situ remediation technologies were used:
3-D Microemulsion FE is an engineered electron donor material that off ers a novel 3-stage electron donor release profi le, pH neutral chemistry and is delivered on-site as a factory-emulsifi ed product. When injected into the subsurface, this stimulates bioremediation of the pollutant by the process of biologically enhanced reductive dechlorination. Bio-Dechlor INOCULUM Plus is an enriched natural microbial consortium containing a high density of Dehalococcoides sp. (DHC). This microbial consortium, when added to the subsurface augments the naturally occurring population of microbes that carry out the desired reductive dechlorination process. CRS (Chemical Reducing Solution) is a soluble iron substrate designed to easily distribute to an aquifer and stimulate that serves to stimulate the abiotic in situ chemical reduction (ISCR) of halogenated hydrocarbon contaminants.