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Use of Cometabolic Air Sparging to Remediate Chloroethene-Contaminated Groundwater Aquifers

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Cost and performance rept.

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The United States Department of Defense DoD is faced with the task of remediating many sites contaminated with a variety of compounds, including chlorinated aromatic hydrocarbon CAH compounds. When a contaminant release occurs, these compounds may be present in the geologic media in any or all of three phases adsorbed to soils, in free-phase form, or dissolved in groundwater. Of the three phases, dissolved contaminants in the groundwater are considered to be of greatest concern because of the risk of human exposure through drinking water primary concerns for sorbed and free-phase contaminants often reside with their potential impact to groundwater. CAHs, used for years as industrial cleaners and degreasers, comprise some of the most common groundwater contaminants found at federal installations chloroethenes and chloroethanes are among the most common solvents. The United States Air Force USAF uses more than 900 sites contaminated with chlorinated solvents in excess of drinking-water standards, and that may require cleanup. Industry, other government agencies, and up to 85 of Superfund sites United States Environmental Protection Agency U.S. EPA and USAF, 1993 face similar cleanup situations. The Environmental Security Technology Certification Program ESTCP supported an 18-month field study to investigate the cometabolic air sparging CAS process at McClellan Air Force Base, California. McClellan AFB McAFB was selected as the demonstration site for a variety of reasons 1 McAFB has significant CAH groundwater contamination 2 previous studies supported by the Air Expeditionary Forces Technologies Division AFRLMLQ, Tyndall AFB, Florida demonstrated that indigenous bacteria at McAFB could utilize propane as a growth substrate and support cometabolic CAH degradation and 3 McAFB is a member of the Strategic Environmental Research and Development Plan SERDP National Environmental Technologies Test Site Program NETTS.

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  • Water Pollution and Control

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