In Situ Chemical Oxidation Significantly Reduces Contamination Concentrations at Former Manufacturing Facility Site

Regenesis Remediation Services (RRS) was contracted to design and perform in situ chemical oxidation (ISCO) via soil mixing to remediate trichloroethylene (TCE) impacted soils at a former manufacturing site in Hamilton, Ohio. RegenOx® was selected as the primary remediation technology based on site conditions, and the treatment area focused on soilbound TCE contamination averaging 86 mg/kg in the sandy-silt to clay-rich unsaturated soils. The remediation objective was to reduce TCE levels in the soil to below the maximum concentration for Toxicity Characteristic Leaching Procedure (TCLP) of 0.5 mg/L, to allow for subsequent off-site disposal.

The impacted soils were treated in-place by a hydraulic excavator with a specialized mixing attachment. RegenOx was evenly dispersed throughout the contaminated soil, then thoroughly mixed using the excavator attachment. Once mixing was complete, the soils were hydrated with a RegenOx solution, to maximize oxidant loading to achieve aggressive remediation goals. As a result of the soil mixing procedures, a 99% reduction in soil concentrations was achieved. RRS remediated approximately 670 cubic yards of TCE-impacted soil on this real estate redevelopment project. Soil mixing was performed primarily from 4 feet to 8 feet below ground surface (bgs) over an area of approximately 4,500 square feet. Construction activities were able to proceed on schedule due to RRS’s well managed application and proper use of the RegenOx chemistry.