The migration, dissolution, and fate of chlorinated solvents in the urbanized alluvial valleys of the southwestern USA |
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Authors: | R E Jackson |
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Institution: | (1) Duke Engineering and Services (formerly INTERA), 9111 Research Blvd., Austin, Texas 78758, USA Fax: +1-512-425-2099 e-mail: rejacks@duke-energy.com, US |
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Abstract: | The migration, dissolution, and subsequent fate of spilled chlorinated solvents in the urban alluvial valleys of the southwestern
U.S. appear to be governed by a unique set of hydrogeologic and geochemical processes occurring within terrigeneous clastic
depositional systems. The alluvial and lacustrine fill of the basins, the trapping of solvents in fine-grained sediments beneath
the urbanized valley centers, the oxic conditions typical of the deeper alluvium, and the contaminant-transport patterns produced
by large-scale basin pumping combine to produce long aqueous-phase plumes derived from the dissolution of trapped chlorinated
solvents. Although of limited aqueous solubility, these dense solvents are sufficiently mobile and soluble in the southwestern
alluvial valleys to have produced aqueous plumes that have migrated several kilometers through the deeper alluvium and have
contaminated valuable water-supply well fields in California, Arizona, and New Mexico. The typical length of these plumes
and the presence of oxic groundwater indicate that it is unlikely that natural attenuation will be a practical remedial option
in the southwestern alluvial valleys or in other alluvial systems in which similar hydrogeologic and geochemical conditions
exist.
Received, December 1996 · Revised, October 1997 · Accepted, November 1997 |
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Keywords: | contamination USA arid regions hydrochemistry chlorinated solvents |
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