New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Wt - Wetlands Programs
Chapter Env-Wt 600 - COASTAL LANDS AND TIDAL WATERS/WETLANDS
Part Env-Wt 607 - DREDGING ACTVITIES
Section Env-Wt 607.06 - Dredge Methods
Universal Citation: NH Admin Rules Env-Wt 607.06
Current through Register No. 13, March 27, 2025
(a) For non-FNP projects, sediment dispersion modeling shall be done to characterize sediment resuspension and dispersion during operations, and modeling outputs shall be used to design operations, including measures to avoid and minimize impacts from suspended sediment and turbidity on living marine resources. Sediment dispersion models shall be field-verified to various sediment and hydraulic conditions to ensure they have been calibrated appropriately to predict sediment transport and dispersion.
(b) Proposed dredging methods shall:
(1) Be based on the nature of
the sediment as determined by sediment characterization, results of contaminant
testing, turbidity transport modeling, and resource vulnerabilities;
(2) Be based on suitability of existing site
conditions;
(3) Be based on
location and suitability of disposal options;
(4) Represent the least
environmentally-impacting practicable alternative; and
(5) Be by one of the following means, listed
in descending order of preference:
a.
Mechanical closed, or enviro, bucket dredge;
b. Mechanical clamshell dredge;
c. Mechanical open bucket dredge;
or
d. Suction dredge.
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