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SWG-2011-00854 - The Nature Conservancy - Nueces County

Published June 17, 2014
Expiration date: 7/18/2014
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Full Public Notice    Project Plans

 

The applicant proposes to construct Phase II of the Shamrock Island Restoration Project which consists of constructing rubblemound (rock) breakwaters, placing shoreline breach fill, and constructing a feeder mound.  The three rubblemound breakwaters will span a total length of 1,500 linear feet including 90- to 95-foot gaps between breakwaters.  The crest of the breakwaters will be constructed to +4.0 feet NAVD88 with a crest width of 6 feet and side slopes of 2H:1V.  The total volume for the breakwaters is approximately 9,800 cubic yards (CY).  The breakwaters will consist of armor stone and bedding stone placed on a geotextile fabric.  The breach fill will be constructed to +4.0 feet NAVD88 and the feeder mound will be constructed to a maximum of + 1.5 feet NAVD88.  The volumes for the breach and feeder mound are approximately 900 and 45,000 CY respectively.  The sand material for the breach fill and feeder mound will be hydraulically dredged from a south and north borrow areas and transported via pipeline to the respective placement areas.  The borrow areas and 150-foot-wide access channel will be dredged up to -8.0 feet NAVD88 with a 4H:1V side slope.  The volume of the access channel is approximately 10,500 CY which will be restored after construction.  The total areas for the north and south borrow areas are 57 and 59 acres, respectively.  An access corridor is located between the access channel and the breach fill which has been limited in width to reduce any disturbances to the island.