An integrated-comprehensive approach to DNAPL characterization
- and others
Disposal of industrial solvents, primarily trichloroethylene and tetrachloroethylene, at the Savannah River Site has resulted in contamination of soil and groundwater. These solvents are relatively insoluble and are denser than water. This type of contaminant tends to move downward as a separate fluid and its distribution is highly stratified and dependent on geologic control. A program, integrating the results from physical, chemical, and geophysical techniques, as well as operational records and theoretical studies is currently underway. Results from three years of the program provide consistent evidence for an improved conceptual model for the behavior of dense nonaqueous phase liquids (DNAPL) under real site conditions. In particular, the data indicate that substantial DNAPL is retained in clays above the water table, and that DNAPL zones below the water table contain significant quantities of residual water. These observations have been confirmed by careful integration of a several complementary characterization tools. For example, the data suggest that codisposed inorganic salt solutions may limit the applicability of some currently proposed geophysical tools, but may provide opportunistic applicability for inexpensive tools that are not normally associated with DNAPL study. The resulting conceptual model for DNAPL behavior at the site is the basis for cost effective (compact and well targeted) future characterization and remediation activities.
- OSTI ID:
- 210497
- Report Number(s):
- CONF-9509139--
- Country of Publication:
- United States
- Language:
- English
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