In early 2005, ARS completed a full-scale FeroxSM project at a DOD facility in Maryland. The primary goal of this remedial action was source zone reduction. The CVOC’s of concern were 1,1,2,2-PCA, cis-1,2-DCE, PCE, and TCE at concentrations greater than 1,000 mg/liter.

The geology consisted of coastal plain deposits of silty sand and gravel overlying a layer of weathered bedrock (saprolite) that was approximately 10’ to 20’ feet thick. The saprolitic bedrock transitioned to competent fractured garnet schist at approximately 30’ feet bgs. The treatment zone extended from the saprolite into the fractured shist.

As part of the injection process, Pneumatic Fracturing (PF) was applied as a precursor to emplacing ZVI powder. More than 77,000 pounds of H-200 ZVI powder were delivered at depths between 15 feet to 35 feet bgs. through 15 boreholes. The project was completed within 16 workdays and on-budget.

Groundwater monitoring within the treatment zone conducted by the site consultant showed immediate and long-term reduction in the target CVOCs. A paper titled “Enhanced Insitu Reduction of CVOCs using Zero-Valent Iron” is scheduled for presentation at the Battelle Chlorinated Solvents Conference in Monterey in May.