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Dredging & Dredged Material Disposal

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star  General Recommendations:
Propwashing is not an acceptable dredging method or means of entering or traversing on, across, or through tracts. In general, discharge of dredged material is not allowed on state-owned submerged lands. Construction techniques such as silt curtains or other barriers that minimize turbidity and migration of dredged materials into sensitive areas are encouraged.

In some situations, dredged material is a resource that may be disposed of in an environmentally sound manner. Beneficial use of dredged material includes, but is not limited to, beach and coastal-wetland nourishment, seagrass restoration, shoreline protection, and mangrove and saltmarsh wetland creation. If dredged material cannot be used beneficially, it should be placed in existing placement areas or on upland sites where levees can be used to contain the material.

Discharge of dredged material in sensitive areas has the potential to cause adverse water quality impacts resulting in reduced oxygen availability for aquatic species, reduced light for seagrasses, and other detrimental environmental effects. Dredged material placement should be coordinated with the commenting agency.

The following mitigation sequence may be applied during the evaluation of potential adverse impacts of a project: (1) avoidance of adverse impacts; (2) minimization of adverse impacts; and (3) compensation for unavoidable adverse impacts.

star  Definitions and Explanations
DA - No dredging on this tract.
Water depths on this tract may be sufficient for access without dredging. Dredging may destroy or degrade sensitive estuarine habitats and reduce the productivity of the bay.

DB - No dredging in water less than 4 feet deep as measured from mean low water.
Protects shallow water areas of 4 feet or less which contain sensitive habitat.

DC - No dredging in water less than 6 feet deep as measured from mean low water.
Protects sensitive estuarine habitats, usually in clearer water where light penetration may reach 6 feet.

DD - No dredging to a depth exceeding 6 feet as measured from mean low water.
This tract is generally shallow, and the creation of excessively deep pockets of water could alter current patterns, cause stagnation pools, and create traps for fish when tide levels drop.

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George Martin
George Martin