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FIELD MEASUREMENTS OF PRE- AND POST-REMEDIAL CONTAMINANT FLUX BY INTEGRAL PUMPING TESTS (WASHINGTON, DC)
Citation:
BROOKS, M. C., C. G. ENFIELD, M. D. ANNABLE, AND A. L. WOOD. FIELD MEASUREMENTS OF PRE- AND POST-REMEDIAL CONTAMINANT FLUX BY INTEGRAL PUMPING TESTS (WASHINGTON, DC). Presented at DoD's Environmental Challenges, Partners in Environmental Technology, Washington, DC, November 30 - December 02, 2004.
Impact/Purpose:
To inform the public.
Description:
The complete removal of all dense nonaqueous phase liquid (DNAPL) contaminant from source zone areas has not been demonstrated with current remedial techniques, and conflicting views on the benefits of partial DNAPL source zone remediation have been expressed in the literature. A comparison of flux measurements before and after remedial activities is one metric that has been proposed to assess benefits of partially alleviating DNAPL source-zones. Integral pumping tests (IPT) have recently been used to measure mass flux at a number of sites, and the technique consists of extracting water from a series of wells aligned perpendicular to the groundwater flow direction. Concentration-time series measurements from the pumping well effluents are used with estimates of the Darcy velocity to calculate contaminant flux. An objective of this work is the application of the IPT technique to measure contaminant flux before and after remedial activities at four field sites located in Fort Lewis, Washington; Borden, Ontario; Jacksonville, Florida; and Hill Air Force Base, Utah. Pre-remedial tests have been completed at all sites, and post remedial tests are projected to be completed over the next year or two. Results to date will be presented, and a comparison will be made to an independent flux measurement technique based on tracer-laden absorbent material placed in the same well series. In addition, the application of analytical solutions to pumping well(s) in a uniform flow field to directly estimate the Darcy velocity without explicit knowledge of the hydraulic conductivity will be discussed.