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 Framework for Dredged Material Management
May 2004
Sediment
Material, such as sand, silt, or clay, suspended in or settled on the bottom of a
water body. Sediment input to a body of water comes from natural sources, such
as erosion of soils and weathering of rock, or as the result of anthropogenic
activities, such as forest or agricultural practices, or construction activities. The
term dredged material refers to material which has been dredged from a water
body, while the term sediment refers to material in a water body prior to the
dredging process.
Suspended solids
Organic or inorganic particles that are suspended in water. The term includes
sand, silt, and clay particles as well as other solids, such as biological material,
suspended in the water column.
Territorial sea
The strip of water immediately adjacent to the coast of a nation measured from
the baseline as determined in accordance with the Convention on the territorial
sea and the contiguous zone (15 UST 1606; TIAS 5639), and extending a distance
of 3 nmi from the baseline.
Toxicity
Level of mortality or other end point demonstrated by a group of organisms that
has been affected by the properties of a substance, such as contaminated water,
sediment, or dredged material.
Toxic pollutant
Pollutants, or combinations of pollutants, including disease-causing agents, that
after discharge and upon exposure, ingestion, inhalation, or assimilation into any
organism, either directly from the environment or indirectly by ingestion through
food chains, will, on the basis of information available to the Administrator of the
U.S. Environmental Protection Agency, cause death, disease, behavioral
abnormalities, cancer, genetic mutations, physiological malfunctions, or physical
deformations in such organisms or their offspring.
Turbidity
An optical measure of the amount of material suspended in the water. Increasing
the turbidity of the water decreases the amount of light that penetrates the water
column. Very high levels of turbidity can be harmful to aquatic life (USACE
1986).
Upland environment
The geochemical environment in which dredged material may become
unsaturated, dried out, and oxidized.
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