Technology Status Report: In Situ Flushing - CLU-IN

In Situ Flushing Project Summaries
GWRTAC Case Study Database
applied in four increments, and since the holes percolated at different rates, the time interval
between doses varied from hole to hole. Testing in three pits was stopped when time intervals
between surfactant applications approached ten hours, creating unacceptable permeabilities were
being created. After seven days of washing the pits received rinses of local, potable well water.
Undisturbed soils beneath each hole were analyzed for residual contamination after nine to 14 PV
of surfactant solution had been applied, and after the final potable water rinses. Contaminant
concentrations in these soils were 5,000 to 10,000 ug/g, which was comparable to prewash
conditions. Researchers concluded that the in situ soil washing was not measurably effective, and
that it is likely that the same ineffectiveness would occur at other chronic spill sites with
contaminants with high soil-sorption values (K>103).
Project costs were not available from reference source.
Report(s)/Publication(s) (Additional Information Sources):
Nash, J. H., 1988, Project Summary Field Studies of In Situ Soil Washing, EPA/600/S2-87/110,
U.S. Environmental Protection Agency, February 1988.
U.S. Environmental Protection Agency, 1991: Engineering Bulletin In Situ Soil Flushing,
EPA/540/2-91/021, U.S. EPA Office of Emergency and Remedial Response (OERR), Washington,
DC 20460, Office of Research and Development (ORD), Cincinnati, Ohio 45268, 8 pp., October
1991.
Ground-Water Remediation Technologies Analysis Center
Operated by Concurrent Technologies Corporation
Appendix - Page 100 of 164
Copyright GWRTAC 1998
Revision 1
Tuesday, November 17, 1998