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impoundment through the existing drainage network and ultimately will discharge to the Indian River. Ditch <br /> construction details such as required slope and stabilization will be deferred to the final design phase of site <br /> development. <br /> 4. 2. 2 Topographic Surveys <br /> Monitoring the containment area between successive dredging events will include two topographic <br /> surveys of the deposition surface. Results from a post-dredging survey, performed as soon as possible after <br /> grading of the dewatered material , will provide an independent check of the dredging pay volume derived <br /> from pre- and post dredging bathymetric comparison . A second topographic survey should be performed <br /> immediately before the start of the next dredging operation . Used in combination with the earlier post- <br /> grading survey, this second survey will assess the degree of material consolidation and determine the <br /> remaining site capacity . <br /> 4 .3 Material Rehandling/Reuse <br /> As discussed in Section 1 . 0 , Site IR- 14 is one of three dredged material management areas being <br /> developed to serve the long-term maintenance requirements of the ICW W within Indian River County. This <br /> report, as well as the accompanying permit documentation , has emphasized that although each site has been <br /> designed fora specific service life , each is also to be operated as a permanent facility for the intermediate <br /> storage and rehandling of dredged material . To fulfill this intended use, at some point the dewatered material <br /> must be removed off site . The ultimate use of this material is discussed in the following paragraphs . <br /> Based on a comprehensive analysis of dredging records and survey data, the bulked material volume <br /> projected for placement and temporary storage over the 50-year design service life of the three Indian River <br /> County facilities exceeds 600,000 cy . Although relatively minor by the standards of some dredging <br /> operations , this volume still represents a significant quantity of potentially valuable material . Even if the <br /> possible return on the sale of this material were disregarded, the cost saving of permanent storage alone <br /> would justify an effort to determine, through a formal market analysis, the potential demand for dewatered <br /> dredged material . <br /> 39 <br />