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Status Report for the Week of March 17, 2008
TECHNICAL ASSISTANCE
Technical Assistance to Region IV: On February 28, 2008, Dr. Scott
Huling (GWERD) provided RPM Brian Farrier with review comments and
recommendations with regard to in-situ chemical oxidation (ISCO) at the
Brunswick Wood Preserving Site in Brunswick, GA. It was pointed out
that the recovery of mobile NAPL is much more efficient and cost
effective than ISCO. There are several mass transfer and mass transport
limitation mechanisms associated with the permanganate oxidation of
NAPLs that limit the extent of their remediation. It was recommended
that enhanced NAPL recovery be further evaluated prior to the deployment
of ISCO activities. The GWERD ISCO Engineering Issue Paper was
referenced and a number of related technical areas were suggested for
further discussions on this issue.
(01-R04-005)
(S. Huling(GWERD)580-436-8610)
Technical Assistance to Region V: On March 4, 2008, Dr. John Wilson
(GWERD) provided U.S. EPA, Region 5, Office of Regional Council Mark
Koller with a review of presentations concerning the source of
hydrocarbons at the DuPont Road Site in Oregon, OH. The comments
followed a presentation in the Regional Office on January 16, 2008, and
an Ohio EPA investigation report. Issues under consideration were
matching soil characteristics, migration direction based on weathering
gradient, source of petroleum in a drainage system, and the nature of
NAPLs at the site.
(08-R05-002)
(J. Wilson(GWERD)580-436-8534)
Technical Assistance to Region IX: On March 4, 2008, Dr. John Wilson
(GWERD) provided Michael Gill and RPM Patricia Bowlin with comments on
two documents related to the McCormick and Baxter Superfund Site in
Stockton, CA. With respect to "Biological Studies Design and
Rationale," it was suggested that the use of data from biotrap studies
is not appropriate to estimate rate constants for biodegradation in
ground water. The use of microcosm studies as initial model input was
also discussed. Comments regarding the "Draft Work Plan McCormick and
Baxter Microcosm Study" concerned field analytical procedures, microcosm
experiments, and the use of data from microcosm studies in model
applications.
(93-R09-004)
(J. Wilson(GWERD)580-436-8534)