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The recommended plan of improvement consists of the following: dredging an entrance channel, 300 feet wide and 12 feet deep through the offshore bar, a distance of approximately 5,160 feet; providing an inner channel, 90 feet wide and 10 feet deep from the entrance channel to the Atlantic Intracoastal Waterway, a distance of 11,000 feet; dredging the lower 5,200 feet of the inner channel; dredging an upcoast deposition basin adjacent to the weir section of the north jetty to a depth of -20 feet to provide a capacity of 200,000 cubic yards; constructing a north jetty 3,385 feet long with a low weir section for sand bypassing; constructing sand dikes on both sides of the inlet to tie the jetties to the existng dune line; and possibly constructing a fishing walkway on top of the south jetty. The adverse environmental effects will be temporary increase in turbidity; alteration of existing vegetation during construction of south sand dike; temporary disturbance of birds and mammals in the area; destruction of some benthic organisms by dredge cutterhead; smothering of invertebrates under jetty stone and in beach disposal area; and possible displacement of wildlife species.
This supplement presents detailed descriptions, a revised cost estimate and updated benefits reflecting modifications to the channels, jetties, and weir system that had previously been approved in the General Design Memorandum. The proposed plan in this supplement provides for the construction of an upcoast and downcoast jetty, an upcoast and downcoast 650' weir section, two sand dikes, two deposition basins, an inner channel, and a 45 deg flared entrance channel. The proposed plan has the same general alignment as the GDM Plan, but incorporates some significant design improvements.