RDX, an organic explosive, was the primary contaminant of concern at Iowa Army Ammunition Plant and secondary contaminants included HMX and TNT. The use of Daramend® reagent supported the efficient removal of all target compounds in soil.
Initial RDX concentrations ranged from 819 mg/kg to 2,270 mg/kg with a mean concentration of 1,530 mg/kg. The initial HMX mean concentration was 1,112 mg/kg and the initial TNT mean concentration was 95.8 mg/kg. Daramend was applied ex situ on two batched samples of soil impacted with nitroaromatic explosive compounds totaling 6,000 cubic yards.
The application involved five treatment cycles to one soil batch and six treatment cycles to the second soil batch over a period of approximately 8 weeks. The concentrations of all regulated compounds, including key degradation intermediates, were reduced to less than their respective remedial criteria in all sampling zones. RDX concentration ranged from 3 mg/kg to 32 mg/kg, HMX mean concentration was reduced to 84.5 mg/kg, and TNT mean concentration was reduced to 6.1 mg/kg.