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2 .0 PRE-DREDGING SITE PREPARATION AND DESIGN FEATURES <br /> 2. 1 Site Design <br /> The present discussion addresses only those aspects of site design which directly influence site <br /> construction and operation as they relate to the facility' s long-term objectives . All other design elements (e .g. , <br /> construction details, materials, etc .) derive from specific information not yet available and thus are <br /> necessarily deferred to the facility ' s final design phase. <br /> 2. 1. 1 Containment Basin Capacity and Configuration Requirements <br /> The containment basin constructed within Site IRA4 (Figure 2 . 1 ) must satisfy four criteria : ( 1 ) <br /> provide sufficient material storage capacity for the projected 50-year material storage requirements of Reach <br /> III of the ICWW in Indian River County, (2) provide adequate separation from adjacent properties , (3 ) <br /> minimally impact sensitive on- site habitats, most notably the wetlands that comprise most ofthe site ' s eastern <br /> one-half, and (4) minimize the excavation depth required to obtain adequate dike material . <br /> First, to repeat, Site IR- 14 is designated as the primary site to serve the maintenance needs of Reach <br /> III of the Waterway in Indian River County . Thus, Site IR44 must provide adequate capacity for the <br /> projected 50-year material storage requirements of Reach III. A comprehensive evaluation of Jacksonville <br /> District Corps of Engineers ' archival records confirmed that this segment of the Waterway has not been <br /> dredged since its 1959 deepening to the present - 12-ft MLW project depth . Nevertheless, the most recent <br /> ( 1996) examination survey documented a total in situ reach shoal volume of 57,498 cubic yards (cy) within <br /> the authorized channel . The projected 50-year storage requirement for Reach III — 162,658 cy — derives <br /> from this documented volume and includes a bulking plus over-dredging factor of 2 . 15 . Thus, the IR- 14 <br /> containment basin must provide a capacity of about 163 ,000 cy. <br /> Second, the basin ' s placementon the site must provide adequate separation from adjacent properties. <br /> As shown in Figure 2 . 1 , the containment dike' s outside toe lies 250 ft from the eastern right-of--way of Indian <br /> River Boulevard on the site ' s western side, and 100 ft from a proposed wetland mitigation area to the north <br /> and <br /> 5 <br />