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Mobile, AL (Thin Layer Disposal)

Beneficial Uses: Capping, Fish and Wildlife Habitats
Lead Agency: Mobile District
Placement Date(s): 1988
Location: Lower Mobile Bay, Alabama
Placement Method: Thin-layer disposal. Dredged material was placed using a small dredge that could be manipulated to spread the material as it fell from the pipe in thin layers.
Substrate Type: Primarily silty maintenance material
Project Size: Less than 10 acres
Project Costs: Estimated $1.00 per cubic yard
Monitoring: Pre-, during, and post-project monitoring conducted by USACE District Mobile, U.S. Environmental Protection Agency, and U.S. Army Engineer Waterways Experiment Station. Motile and non-motile organism impacts and recolonization and water quality were monitored. Minimal impacts resulted, and organism levels were at pre-project levels in 6 months.
Comments: Thinlayer (not more than 12 inches) placement over a large bay bottom area is intended to minimize impacts on benthos and reduce recovery time.

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