Installation of Ferox sm Source Zone Treatment at Hunters Point Navy Shipyard
In October of 2004, ARS completed a second-phase application of
FeroxSM treatment at Parcel C located at Hunters Point Shipyard in
San Francisco, California. The objective of the project was to
address groundwater TCE contamination in a roughly 40,000-sq. ft.
area under and around two buildings. This application was an
expansion of a successful application by ARS in December of 2002
as part of a technology demonstration to address the hot spot of
the plume with TCE concentrations upward of 80,000 ug/l. Subsequent
to the first application, TCE in the hot spot area was reduced to
double-digit ppb levels.
The recently completed 2nd application targeted the portion of
contaminations outside the first treatment area with TCE
concentrations higher than 1,000 ug/l. ARS successfully emplaced
more than 70,000 pounds of a proprietary zero-valent iron powder
(H-200, visit www.zerovalentiron.com) via thirteen (13) injection
points at various depths ranging from 14 feet to 60 feet bgs.
Pneumatic fracturing was required at some locations to facilitate
delivery of the ZVI material into the subsurface. Post-Injection sampling
results 3 months after this field application shows TCE concentrations
reduced by 99% or higher in a number of monitoring points. TCE in the
“hottest” monitoring well was reduced from 4,400 ug/l to 230 ug/l as of
January 2005. ARS expects the concentration within the treatment area to
continue decreasing following a similar long-term pattern observed after
the first phase treatment.
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