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2009-323A
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2009-323A
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Last modified
3/17/2016 1:36:04 PM
Creation date
10/1/2015 12:58:28 AM
Metadata
Fields
Template:
Official Documents
Official Document Type
Certificate
Approved Date
12/15/2009
Control Number
2009-323A
Agenda Item Number
8.D.
Entity Name
Florida Inland Navigation District
Subject
Dredged Material Exhibit B
Supplemental fields
SmeadsoftID
7963
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� a <br /> 4. 0 POST-DREDGING SITE MANAGEMENT <br /> The post-dredging phase of site operation begins following the completion of decanting and <br /> continues until the start of the next planned dredging event. Post-dredging site management will be <br /> accomplished through the joint efforts of the FIND and the Jacksonville District, COE, and will include, at <br /> a minimum , quarterly site inspections . Additional post-dredging site management tasks are discussed in the <br /> following section . <br /> During the post-dredging phase, dredged material deposited within the containment basin is actively <br /> managed to reduce its moisture content. Through this process, the material is made suitable for handling and <br /> removal, should market conditions prove favorable . However, Site IR44' s intended use as a permanent <br /> facility requires other management procedures between successive dredging operations. These include a <br /> comprehensive monitoring and data collection effort, mosquito control, and site security. Each element of <br /> post-dredging site management is discussed below . <br /> 4. 1 Dewatering Operations <br /> Dewatering techniques to be used at Site IR- 14 depend on the physical characteristics of the dredged <br /> material . As discussed in Section 2 .3 .3 , preliminary data indicate that the material to be placed in the IR44 <br /> containment basin may contain up to 80% silts and clays (i .e . , particles <0 . 074 mm in diameter), with <br /> organics comprising up to 3 % . This fine-grained fraction will be the most resistant to drying. The relatively <br /> thin deposition layer resulting from a typical dredging operation (<2. 0 ft, Section 3 . 3 ) suggests that the <br /> coarser sediment fraction will likely dry through natural evaporation and percolation alone . However, <br /> effectively lowering the moisture content of the fine-grained fraction will likely still require supplementary <br /> dewatering techniques . The most appropriate dewatering techniques for this purpose include surface water <br /> removal , progressive trenching to promote continued drainage, and progressive reworking or removal of the <br /> dried surface layer. Each procedure and its specific application to the present situation are discussed below . <br /> Decanting all ponded surface water is necessary before significant evaporative drying of the fine- <br /> grained material can occur . Simply continuing to lower the weir crest will remove most of the ponded water <br /> following the completion of dredging operations. However, the anticipated topography of the deposition <br /> 36 <br />
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