Riverine Sand Mining Scofield Island Restoration Project (BA-40)

Transcription

1 Riverine Sand Mining Scofield Island Restoration Project (BA-40) Kenneth Bahlinger CPRA Project Manager Michael Poff CEC Project Engineer October 24, 2012 committed to our coast committed to our coast

2 Coastal Protection and Restoration Authority of Louisiana

3 Vicinity Map EMPIRE WATERWAY PROJECT SITE BURAS TRIUMPH BOOTHVILLE VENICE SOUTHWEST PASS HEAD OF PASSES

4 Project Setting Plaquemines Parish 2.4 mile long barrier island Significant wetland loss Historical shoreline erosion rate ~ 16.5 ft/yr Proposed Habitats: Dune ~240 Ac, Marsh ~ 400 Ac First Use of Miss. River Sand for Barrier Island Dune

5 Recent and Future Projects in Vicinity West Belle Pass Caminada Headland East Grand Terre Chenier Ronquille Chaland Headland Bay Joe Wise Shell Island Pelican Island Scofield Island Grand Liard Note: All CWPPRA Projects are NOAA Sponsored CWPPRA CIAP/State Surplus CWPPRA/CIAP CWPPRA CWPPRA CWPPRA LCA/Berm to Barrier CWPPRA CWPPRA/Berm to Barrier CWPPRA Constructed Under Construction Funded for Construction In Engineering and Design

6 Finfish LOUISIANA PLAQUEMINES PARISH Million pounds Million pounds Source LSU Ag Center: Coastal Protection and Restoration Authority of Louisiana

7 Shrimp LOUISIANA PLAQUEMINES PARISH 74.3 Million pounds 14.2 Million pounds Source LSU Ag Center: Coastal Protection and Restoration Authority of Louisiana

8 Crabs LOUISIANA PLAQUEMINES PARISH 30.7 Million pounds 1.3 Million pounds Source LSU Ag Center: Coastal Protection and Restoration Authority of Louisiana

9 Oysters LOUISIANA PLAQUEMINES PARISH 933,741 Sacks 302,662 Sacks Source LSU Ag Center: Coastal Protection and Restoration Authority of Louisiana

10 Project Timeline NOAA CWPPRA Plan Formulation commenced in 2004 Feasibility Study initiated in % Design Review in March 2010 BP Berm Permits for construction were issued in July 2011 Construction Contractor Notice to Proceed issued on May 1, 2012

11 Project Overview Unique Aspects of the Project

12 Scofield Island Gulf of Mexico Image Date: May 13, 2011

13 Primary Objective Transport sand from the Mississippi River to Scofield Island in the most efficient manner. POINT A MISSISSIPPI RIVER POINT B SCOFIELD ISLAND

14 Unique Aspects of the Project First use of Mississippi River Sand for Barrier Island Excavation in one of the nations busiest navigational waterways Delivery of riverine sediments over 22 miles A conveyance corridors that requires: Jack and bore casing pipe installation under two highways Crossing of 2 levees and a harbor canal Construct barrier island on berm platform

15 Project Goals Create and sustain critical barrier island habitats Use sand from Mississippi River for dune platform Construct intertidal marsh platform Address diverse concerns and needs of stakeholders Evaluate use of Mississippi River as a sustainable resource for coastal restoration

16 Stakeholders Mississippi River Navigational interests U.S. Army Corps of Engineers U.S. Coast Guard Plaquemines Parish Government Empire Waterway Users Louisiana Department of Transportation for highway crossings Oyster Lease Holders along Empire Waterway and at Scofield Island Landowners along 18 mile conveyance corridor segment of Empire Waterway and at Scofield Island Local Recreational/Commercial Fishermen

17 Engineering & Design Detailed screening analysis of multiple borrow areas (7), dredge methods (2), conveyance corridors (4), and conveyance methods (2) Selected 2 Borrow Areas / 2 dredge methods for flexibility and optimizing contractor bidding Impacts to River/levees 20 Year Design Life

18 Primary Challenges: Determine most efficient Conveyance Corridor considering technical, environmental, institutional, and fiscal parameters; Corridor crosses about 60 pipelines; Achieve consensus among diverse stakeholders especially Navigation Industry, U. S. Coast Guard, and U.S. Army Corps of Engineers; Quantify potential impacts of mining riverine sand sources on river hydrodynamics Consideration of cultural resources along river

19 Sediment Mining and Conveyance Methodology Screening 19

20 Borrow Area MR-E-09 Section

21 Conveyance Corridor Upper Segment

22 Scofield Island A-A Project Design & Benefits

23 Scofield Island Construction Parameters FILL VOLUMES BEACH/DUNE FILL TOTAL 1,632,000 yd 3 MARSH FILL TOTAL 1,762,000 yd 3 CONTAINMENT DIKE FILL TOTAL 525,000 yd 3 LINEAR FEET BEACH/DUNE FILL TOTAL CONTAINMENT DIKE FILL TOTAL FLOTATION CHANNEL (REQUIRED) 13,100 ft 15,600 ft 14,100 ft ACRES BEACH/DUNE TOTAL Project Design & Benefits MARSH TOTAL 240 ac 400 ac

24 STATUS TODAY Great Lakes Dredge and Dock is the Contractor NTP May 1, 2012 First 3 months surveying; Assembling pipe at 3 construction yards Jack and Bore under roads Completion August 2013 Coastal Protection and Restoration Authority of Louisiana

25 Coastal Protection and Restoration Authority of Louisiana

26 Coastal Protection and Restoration Authority of Louisiana

27 Communication/Coordinating with Stakeholders Lessons Learned Sand quality of the Mississippi River performance versus offshore sand source performance Renewability of the Riverine sources Logistics of Riverine Mining in the Mississippi River

28 Lessons Learned Work together with Navigation Industry, U. S. Coast Guard, and U.S. Army Corps of Engineers to ensure Safety, Open Navigation Channel, and River Operations Working together to keep the Mississippi River open, safe, and restore the coast of Louisiana.

29 Acknowledgements DESIGN TEAM ALPINE OCEAN SEISMIC SURVEY, INC. ARCHAEOLOGICAL RESEARCH, INC.

30 For additional information/discussion: Kenneth Bahlinger (225) Coastal Protection and Restoration Authority of Louisiana