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GUIDELINES
Disposal
2. Upland Disposal
i.
Dredged material disposal sites shall not impair scenic views
and will be completely enclosed by levees or berms of sufficient
capacity to allow for the settling of sediments before entrapped
water leaves the leveed area. The outside face of the levees
shall be sloped at 1 ½ to 1 (horizontal to vertical) or
flatter and seeded with grass or otherwise protected to prevent
erosion. Outlet structures in levees shall be placed so that
water discharged within the levees will take the longest possible
time to reach the outlet and shall be designed so that only water
having the least possible amount of turbidity is allowed to return
to the receiving waters.
ii. Except as noted below, upland disposal and site preparation shall
be conducted such that:
a) Surface runoff from disposal sites
is controlled to protect water quality and prevent sedimentation
of adjacent water bodies, wetlands, and drainage ways. Disposal
runoff water must enter the receiving waterway through a controlled
outfall at a location with adequate circulation and flushing
characteristics. Underground springs and aquifers must be identified
and protected;
b) Levees are constructed according to accepted engineering standards;
are adequate to support and contain the maximum potential height
and volume of dredged materials at the site; and form a sufficiently
large containment area to encourage proper ponding and to prevent
the return of dredged materials into the waterway or estuary.
Containment ponds and outfall weirs shall be designed to maintain
adequate standing water at all times to further encourage settling
of dredged materials. The levees shall be constructed within
the boundaries of the disposal site and shall be constructed
of material obtained from within the site or other approved source.
c) Clean dredged material placed on upland disposal sites located
directly adjacent to designated beach nourishment sites may be
allowed to flow directly into the waterway without conforming
to Items i and ii, above, provided that all policies and standards
for in-water disposal and beach nourishment are met and the dredged
materials are not allowed to enter wetlands or the waterway in
areas other than the designated beach nourishment site.
iii. Upland
disposal sites which are not intended for dredged material
disposal or development use within a two year period following
disposal shall be revegetated with native plant species as soon
as site and weather conditions allow, unless habitat management
plans agreed upon by resource management agencies specify that
open sand areas should remain at the site. The dredging project
proponent shall notify the local jurisdiction and State and Federal
permitting and resource management agencies when disposal is
completed and shall coordinate revegetation with these agencies.
The notification shall be sent to at least the following agencies:
the local jurisdiction, U.S. Army Corps of Engineers, National
Marine Fisheries Service, Soil and Water Conservation District,
Natural Resource Conservation Service, Division of State Lands,
Oregon Department of Fish and Wildlife, Department of Ecology,
Department of Natural Resources, and Washington Department of
Fish and Wildlife. Revegetation of a disposal site does not preclude
future uses of the sites for dredged material disposal.
iv. The disposal site design shall be reviewed to determine
if wetlands
or other habitats will form on the site during the period between
disposal actions. The disposal permit may be conditioned to allow
future disposal actions to fill the created wetlands or habitats.
v. Oregon jurisdictions add: "The area shall not
be a significant Goal 17 wetland."
vi. The final height and slope after each use of a upland
dredged material disposal site shall be such that:
a) The site does not enlarge itself
by sloughing and erosion into adjacent areas;
b) Loss of materials from the site during storms and freshets
is minimized;
c) Interference with the view from nearby residences, scenic
points, and parks does not occur.
vii.
Coordinate with Oregon Division of State Lands or Washington
Department of Natural Resources to determine what, if any, royalties
are required. |