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RRS was contracted to design and perform chemical oxidation via soil mixing to remediate tetrachloroethene (PCE) impacted soil at a dry cleaner site located in Cook County, Illinois. RegenOx® was chosen as the primary remediation technology for the chemical oxidation. The treatment area focused on soil bound PCE contamination around 1,170 mg/kg in the clayey unsaturated soils. The soil remediation objective was to reduce PCE levels below the 240 mg/kg soil saturation limit established by the Illinois EPA.
The impacted soils were removed by a mini trackhoe excavator and placed adjacent to a treatment cell inside a vacant unit where the soil mixing was performed. A proportioned amount of RegenOx was evenly dispersed throughout the excavated, contaminated soil then thoroughly mixed using the excavator.
Once mixing was complete, the soils were placed back into the treatment cell while being hydrated with a RegenOx solution. As a result of optimizing the contact between the soil, contaminants and RegenOx, powerful desorption effects strip PCE off of the soil matrix and onto the RegenOx catalytic surface. The catalyst allows localized, free-radical generation which leads to more focused and efficient contaminant destruction. RegenOx is also a non-corrosive chemical oxidation reagent which minimizes health and safety concerns while enabling use around sensitive infrastructure.
Approximately 242 cubic yards of soil bound contaminant mass was successfully treated at this site. Soil mixing was performed from surface grade to approximately 10 feet below grade.