Bridgeport TCE Biostimulation May 2021

Incidental releases of trichloroethene (TCE) at former electronics manufacturer in east-central Ohio impacted shallow overburden-bedrock groundwater. Hydrogeology includes 15 to 20 feet of alluvial silty clay or gravelly sand overlying fractured sandstone with estimated 10-foot thick interval of dense non-aqueous phase liquid (DNAPL) trapped in primary/secondary porosity of shallow bedrock.  Baseline [TCE] in bedrock ranged from 55-550 milligrams per liter (mg/L), up to ≈30% of TCE`s aqueous solubility limit; dechlorination byproduct cis-1,2-dichloroethene (cis-1,2-DCE) at ≤15 mg/L and Vinyl chloride (VC) not detected above method detection limits (0.25-10 mg/L).  Pump & treat system operates to manage plume migration. Responsible party desires low-impact, low-cost and sustainable strategy to achieve enhanced reductive dechlorination (ERD) which targets DNAPL destruction.