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. Jacksonville Harbor, in Duval County, FL, begins at the mouth of the St. Johns River where it empties into the Atlantic Ocean (Figure 1). The Federally authorized Jacksonville Harbor navigation project provides deep-draft vessels access to terminal facilities located within the City of Jacksonville. Jacksonville Harbor also serves the US Navy and the US Marine Corps. The Jacksonville Harbor General Re-evaluation Report (GRR) is investigating deepening and widening the Federal navigation channel. The GRR will most likely identify about 20 million cubic yards (cu yd) of material to be dredged and placed. All of this new- work dredging material is Offshore Dredged Material Disposal Site (ODMDS)-quality, w ith most of this dredged volume assumed to be going into the Jacksonville Harbor ODMDS (Figure 1) because options for upland disposal are unavailable. This material could be more beneficially used to create complex island habitat in the St. Johns River, which would additionally save the GR R millions of dollars. This Coastal and Hydraulics Engineering Technical Note (CHETN) was prepared by the US Army Engineer District (USAED), Jacksonville (SAJ), as part of the Regional Sediment Management (RSM) program, to emphasize a least-cost and beneficial alternative for using dr edged material not suitable for nearshore placement. JACKSONVILLE HARBOR SEDIMENTS. There are four designations of dredged material quality throughout Jacksonville Harbor: 1. Beach quality material, which has less than 10% fine sediments. 2. Nearshore quality material, which has more than 10% but less than 20% fine sediments. 3. ODMDS quality material, which is too fine for beach or nearshore placement and must pass testing for physical, chemical, and toxicological parameters according to Section 103 of the Marine Protection, Research, and Sanctuaries Act (1972). 4. Confined Disposal Facility (CDF)- only quality material, wh ich is not suitable to be placed on the beach, nearshore, or within ODMDS, but which is

Creation of Island Habitat in Jacksonville Harbor, FL