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Page Title: Figure 1-3. Schematic of contaminant migration pathways for nearshore CDFs
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Volatilization
Weir
Bioturbation
Effluent
Unsaturated
High Tide
Ground
Partially
Water
Infiltration
Saturated
Low Tide
Soluble Diffusion
Saturated
Seepage
Existing
Leachate
Seepage
Bottom
Figure 1-3. Schematic of contaminant migration pathways for nearshore CDFs
1.4 Applicability
1.4.1 Disposal in CDFs
The UTM provides methods for assessment, where appropriate, of potential
effects of proposed disposal of dredged material in upland, nearshore, and island
CDFs. It uses physical, chemical, and biological analyses as necessary to provide
effects-based conclusions within a tiered framework regarding potential
contaminant-related impacts outside the CDF associated with the five potential
pathways (USACE/EPA 1992): effluent, precipitation runoff, leachate and
seepage, volatilization, and direct uptake by wetland and terrestrial plants and
animals.
1.4.2 This Manual Does Not Address
Impacts at the dredging site associated with the dredging activity itself.
Physical impacts related to construction of the CDF and the disposal of
dredged material.
Impacts associated with material excavated from drainage ditches and
land clearing activities.
Impacts associated with the discharge of fill material.
Submerged confined disposal, such as CAD, disposal in CAD pits,
capping, or other disposal activities in the aquatic environment.
Any unconfined disposal (e.g., beach nourishment), whether on land, in
wetlands, nearshore, or in water.
Microbiological impacts unless there may be human health concerns.
1-5
Chapter 1
Introduction

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