Y--DREDGED MATERIAL CONTAINMENT AREA 14B DIKE RAISING AND WEIR IMPROVEMENTS, SAVANNAH HARBOR, JASPER COUNTY, SOUTH CAROLINA.

This project includes the raising of the existing perimeter containment dike of the Dredge Material Containment Area (DMCA) 14B. The perimeter dike spans a length of 25,000 feet. The crest of the quote mark front dike, quote mark or the stretch of dike that parallels the Savannah River, is currently at an approximate elevation of 33 feet MLLW. The quote mark back dike, quote mark or stretch of dike that's opposite the front dike, is currently at elevation 25 feet MLLW. The cross dikes transition in elevation from 33 to 25 feet MLLW. This project will involve raising the current dike approximately 6 feet in height to an elevation range of 31 to 39 feet MLLW. The construction of the new dike will be on the interior slope of the existing dike. The design also includes a stability berm/counterweight on the inside toe of the new dike from Stations 52+00 to 157+00. Approximately 760,000 cubic yards (CY) of fill material will be required for the raising. This estimate includes the volume required to fill the template (560,000 CY) and accounts for any settlement or displacement that will occur during or prior to construction (200,000 CY). Fill material will be obtained from the interior of DMCA 14B. Additionally, a contract option will be included for the construction of an 8 acre oval-shaped bird island within the interior of the DMCA. Weir repairs are required for the four weirs that control drainage from the DMCA. All four weirs will be relocated a distance of approximately 70 feet to the interior of the DMCA. A second contract option will consist of adding a fifth new weir, adjacent to an existing weir which will tie into one of the existing outfall pipes.