USGS Washington Water Science Center
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Fort Lewis is a 135-square-mile U.S. Army post in Pierce County, Washington, located just south of Tacoma. The Environmental and Natural Resources Division of Fort Lewis wishes to evaluate the effectiveness of the current and potential remediation activities at the Logistics Center, a regional maintenance facility at Fort Lewis where pump-and-treat systems are being used to remediate chlorinated volatile organic compounds (VOCs), especially trichloroethylene (TCE), in the ground water. To do this, the Army needs to better understand the local and regional ground-water flow systems at the site, and the relation between the two. The present and historical distributions of the contaminants of concern, especially the TCE, also need to be known. This information will also be needed to support evaluations of the potential for other remedial activities, such as natural or assisted biodegradation, that might accelerate the remediation of the site.