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Environmental Health - Toxic Substances

Research Projects

Chlorinated Solvents Contamination

Aerial photo and map legend of a remediation system at the Naval Air Station, Pensacola, Fla.
USGS scientists assisted the U.S. Navy with the design and assessment of an innovative remediation system that involved the injection of an oxygen-release compound in the source area of a chlorobenzene and benzene plume at the Naval Air Station, Pensacola, Florida. The two transects are along groundwater flow paths -- from the Natural Attenuation of Chlorinated Solvents Photo Gallery

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Chlorinated solvents have properties that make them useful for degreasing fats, oils, waxes, and resins. They are used widely and have been manufactured in large quantities. Some chlorinated solvents are dichloromethane, tetrachloroethene, trichloroethane, and tricholoroethene. The U.S. production of these compounds in 1980 were 255,000, 347,000, 314,000, and 121,000 metric tons, respectively.

Chlorinated solvents in general are harmful to human and ecological health. They can cause or are suspected of causing cancer, and are toxic or harmful to aquatic organisms.

Spills and leaks of chlorinated solvents have caused widespread subsurface contamination in the environment. Commonly these contaminants are present in the subsurface in the form of non-aqueous phase liquids (NAPL, the bulk chemical product), as dissolved contaminants in ground water, associated with aquifer sediments, and as vapors in the unsaturated zone. Because the density of these NAPL’s is greater than water, they tend to sink in ground water systems, which results in a complex dispersal and plume patterns, long-term sources in the subsurface, and difficult clean-up. Under the proper conditions, biodegradation and volatilization can contribute significantly to the removal of chlorinated solvents from the subsurface, making natural attenuation a potentially important remediation alternative.

The project activities undertaken fall into 2 general categories: Plume-scale research at representative contamination sites, and research on microbial degradation pathways for chlorinated solvents. More information is provided on these activities as follows:

Plume-Scale Research at Representative Contamination Sites

Chlorinated Solvents in Fractured Sedimentary Rock -- Naval Air Warfare Center (NAWC) Research Site, West Trenton, New Jersey

Field Investigation of Natural Attenuation of Chlorinated Solvents -- Picatinny Arsenal, New Jersey

Microbial Degradation Pathways for Chlorinated Solvents

Microbial Degradation of Chloroethenes in Ground Water Systems

Application of Molecular Methods in Microbial Ecology to Understand the Natural Attenuation of Chlorinated Solvents

Program Headlines Related to Chlorinated Solvents Contamination

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