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NORFOLK NAVAL SHIPYARD TRANSFORMS LANDFILL FROM HAZARDOUS WASTE SITE INTO THRIVING WETLAND U.S.Department of Defense, Washington, DC. Fiscal Year 2001 Defense Environmental Restoration Program Annual Report to Congress, p 15, 2002
By implementing several innovative ideas, the Navy reduced the cost
of the removal actions at a hazardous waste site by more than $2 million
and created a 1.9-acre wetland area in the process. Norfolk Naval
Shipyard (NNSY), VA, builds, repairs, and maintains ships for the Navy.
As part of these activities, NNSY paints ships and removes existing
paint coatings. The paint-removal process produces a waste product
called abrasive blasting material (ABM), which often contains hazardous
metals, such as lead, chromium, and cadmium. ABM may be classified as
hazardous waste when concentrated at high levels. Historically, NNSY
disposed of ABM in the New Gosport landfill, which is located near a
neighborhood and a Navy Youth Center in Portsmouth, VA. In 1982, low
levels of lead were found in the landfill. To prevent human exposure to
the material, the Navy graded the site, covered it with clean soil, and
planted grass. Although further studies indicated that ABM waste had not
significantly affected surrounding soils, there were elevated levels of
metal contamination in wetland soil samples downstream of the landfill,
and it was decided to remove the material. In the initial stages of the
removal action, the Navy's remediation contractor proposed an innovative
process that pre-treats the soil to stabilize lead during cleanup.
Triple superphosphate was used to pre-treat the soil and stabilize the
lead during cleanup, rendering the material non-hazardous and cheaper to
dispose of, and yielding a cost avoidance of $1.4 million. Approximately
55,000 tons of ABM and contaminated soil were removed from the site.
Other innovative ideas helped save time and money as well. For example,
heavy debris contained in the ABM was sifted from the material, cutting
costs for transportation and disposal. After the ABM was excavated, in
lieu of backfilling the large excavated area with clean fill, the
remediation team decided to create a 1.9 acre tidal wetland. The wetland
was planted with 18,000 Spartina alterniflora plants and 3,000 Spartina
patens plants. The newly created wetland area of native salt marsh
plants increased vegetated buffers in the Chesapeake Bay watershed. By
eliminating the need to backfill the area, the project avoided $750,000
in costs. The removal of the hazardous waste site and the transformation
of the property into a thriving wetland were accomplished by June 2001
as part of the Navy's Installation Restoration program with the full
support and input of the Virginia Department of Environmental Quality
and the U.S. EPA.
The Technology Innovation News Survey welcomes your comments and
suggestions, as well as information about errors for correction. Please
contact Michael Adam of the U.S. EPA Office of Superfund Remediation
and Technology Innovation at adam.michael@epa.gov or (703) 603-9915
with any comments, suggestions, or corrections.
Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.