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Combat training at the Joint Readiness Training Center and Fort Polk (Reservation) often involves using materials such as ammunition, propellants, projectiles, explosives, and pyrotechnics. Residues from these materials could affect the quality of surface water that drains training areas of the Reservation. Transport of these typically hydrophobic compounds can occur when contaminants are dispersed in the water or when they are adsorbed to suspended solids. Freshwater mussels are ideal integrators of stream water quality and may be useful in determining whether residues from explosive compounds are transported into surface water downstream from training areas. The mussels (1) have limited mobility in a stream, (2) filter several gallons of water daily, (3) are exposed to suspended and dissolved chemicals in a stream, and (4) have life spans that range from 10 to 100 years. In 2002, the U.S. Geological Survey, in cooperation with the U.S. Army Joint Readiness Training Center and Fort Polk, collected freshwater mussels as part of an ongoing water-quality monitoring program. This report presents data for selected explosive compounds (table 1) analyzed in tissue from mussels collected from 16 selected streams that drain the two major training areas, the Main Post and the Peason Ridge training area, of the Reservation. This report also presents a comparison of results between a previous study (1994) and the current study (2002).

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Explosive compounds detected in tissue of freshwater mussels from selected streams near or on the Fort Polk Military Reservation, Louisiana, May and June 2002