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Title: Environmental Assessment : Construction of Intracoastal Waterway Dredged Material Management Area O-23, Martin County, Florida
Authors: United States. Army. Corps of Engineers. Jacksonville District.
Keywords: Martin County (Fla.)
Dredging spoil
Intracoastal waterways
Environmental management
Environmental protection
Publisher: United States. Army. Corps of Engineers. Jacksonville District.
Abstract: The Jacksonville District, U.S. Army Corps of Engineers (Corps) will be conducting maintenance dredging of the Intracoastal Waterway (IWW) and Okeechobee Waterway (OWW) in Martin County, Florida. Currently there is one dredged material management area for dredged material from the OWW, and limited capacity for the IWW north of the Stuart Causeway. The proposed O-23 DMMA site is being proposed to handle the estimated approximately 250,000 cubic yards of shoal material to be removed from portions of Reach I and II of the OWW over the next fifty years. Due to its relatively close proximity to the IWW (5 miles), the proposed O-23 DMMA site may also receive dredged material from portions of that waterway as well. The purpose of the proposed project is to construct a new dredged material management area (DMMA) to place dredged material from future dredging of federal channels or other permitted dredging projects. The need for the project is driven by the available capacity of any localized disposal site to account for the accumulation of sediment, commonly referred to as shoaling. Shoaling has restricted the width of the OWW and IWW project channels and reduced their depths hindering safe and efficient vessel navigation. Periodic dredging is required to remove accumulated sediments and thus maintain the channels at their federally authorized or permitted designed depths. This Environmental Assessment (EA) and Finding of No Significant Impact (FONSI) will evaluate construction of an upland site for future placement of dredged material. A separate National Environmental Policy Act (NEPA) analysis will be conducted for dredging and placement of material at this site. The Preferred Alternative consists of constructing a DMMA at the O-23 site, which is approximately 31 acres in size. Approximately 21 acres will be used for construction of the DMMA, of which approximately 14 acres will be used for the confined disposal facility. The remaining 10 acres will preserve the on-site sand pine, pine flatwoods, and wetlands in addition to buffering adjacent properties from the project. Dredged material will be hydraulically pumped and placed in the upland site, which is provided by the Florida Inland Navigation District.
Description: Environmental Assessment and Finding of No Significant Impact
Rights: Approved for Public Release; Distribution is Unlimited
Size: 68 pages / 14.17 MB
Types of Materials: PDF/A
Appears in Collections:Environmental Documents

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