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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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e � <br /> both the Jupiter fine sand and the Perrine Variant loamy fine sand typically possess a hard, continuous to <br /> fractured limestone strata within 12 to 24 in . of the soil surface . If present, a shallow limestone strata could <br /> require non- standard excavation methods for containment basin construction , could limit excavation depth, <br /> and could dictate obtaining some dike construction material off site . However, inspection of the banks of the <br /> large east-west ditch that bisects these soil groups failed to reveal the indicated limestone strata. A detailed <br /> subsurface survey will provide more specific geotechnical information before final design and construction <br /> of the containment basin. As shown , the basin' s preliminary design provides the maximum footprint within <br /> the bounds set by the two preceding criteria and thus minimizes the excavation depth needed to provide the <br /> required dike material . <br /> 2. 1. 2 Containment Basin Design <br /> With the optimal basin footprint thus determined , the resulting containment basin design is specified <br /> as follows . Within the 15 . 54-acre containment area, dikes will be constructed to a crest elevation of + 14 . 7 <br /> ft NGVD, or 11 . 0 ft above the existing mean site elevation of +3 . 7 ft NGVD (Figure 2 . 3 ). The dike cross" <br /> sectional design, including side slopes of 1V : 3H and a dike crest width of 12 ft, will require 54,945 cy of <br /> material for construction . Ramps to provide equipment access to the interior of the containment basin for <br /> material dewatering and transfer will require an additional 1 ,667 cy of material. Excavating the basin interior <br /> to a mean elevation of 4 . 4 ft NGVD — 4 . 1 ft below the existing mean grade elevation of the basin footprint <br /> — will provide material for dike and ramp construction . An interior slope of approximately 0 . 2% will <br /> provide drainage from the inlet point to the outlet structures. Thus the excavated grade within the basin will <br /> range from +0 .4 ft NGVD at the inlet to - 1 .2 ft NGVD at the weirs . Excavation set back 20 ft from the inside <br /> toe of the dikes will maintain the IV :3H side slope of the dikes. With the containment basin filled to <br /> capacity, the surface of the deposition layer will tie a minimum of 4 ft below the dike crest, comprising 2 ft <br /> of freeboard and 2 ft of ponding above the maximum deposition surface. The resulting basin capacity — <br /> 178,051 cy — exceeds the projected 50-year storage requirement for Reach III by 9. 5 %. <br /> 2.2 Facility Construction <br /> Construction of the IR44 facility will occur in two phases. The first phase — to be completed as <br /> soon as practical following site acquisition — will include clearing and grubbing all vegetation from within <br /> 9 <br />
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