Beneficial Use of Dredged Material Southwest Pass Calcasieu Mermentau Freshwater Atchafalaya Houma Lafourche Barataria Tiger Pass South Pass Baptiste Collette Mississippi River Shallow Draft Crossings Beneficial Use Sites Deep Draft Crossings GIWW New Orleans Harbor Coastal Zone The New Orleans District (MVN) has largest maintenance dredging program in the nation. MVN maintains 11 major navigational channels in LA. (2800 miles of waterways) Annually remove about 74.4 million CY of shoal material. LA Coastal Zone generally follows the GIWW Most Mississippi River Deep Draft Crossings (DDX) and all Shallow Draft Crossings (SDX) outside of LA Coastal Zone Beneficial Use of Dredged Material

MVN Beneficial Use of Dredged Material Average Annual Totals Maintenance Dredging = 74,440,564 CY Fluff = 16,319,069 CY Unavailable = 18,689,262 CY Suitable & Available for BU = 39,432,233 CY Although approximately 74.4 million cubic yards (CY) is annually removed during routine maintenance dredging in MVN, the actual number of CY’s that is both suitable and available for beneficial use placement each year is a smaller number: Unsuitable material = “Fluff”. Approximately 16.3 million CY of “fluff” is removed annually from the Calcasieu and Atchafalaya River bar channels. Unavailable material = dredged material that is removed from sites that are too distant (i.e., remote) from suitable beneficial use disposal areas to be affordable (primarily from the Miss River Deep Draft and Shallow Draft Crossings). Subtraction of material that is unsuitable and unavailable for beneficial use placement reduces the amount that can be used beneficially to about 39.4 million CY’s annually. A recalculation of the amount of dredged material that is annually used beneficially to remove the amount that is either unsuitable or unavailable results in a percentage increase in the amount of dredged material that is annually used beneficially (to 42% instead of 22%). BENEFICIAL USE = 16,438,861 CY

1976- 2015 ~39,568 acres of created land (~62 square miles of land) NEW ORLEANS DISTRICT Beneficial Use of Dredged material 1976-2015 ~ 33,083 acres wetlands ~ 3,485 acres other habitats ~ 3,000 acres uplands (Southwest Pass) Other Habitats = Bird Islands, Beach/Shoreline Nourishment, Barrier Island Restoration 1976- 2015 ~39,568 acres of created land (~62 square miles of land)

Breakdown of Total Cumulative Acres Created from 1976 through 2015 (39,568 acres): Wetlands = 33,083 Other Habitats = 3,485 (includes bird nesting islands, barrier island restoration, beach nourishment, bank stabilization) Southwest Pass Uplands = 3,000

Projects with No Federal Standard BU Placement Sites Houma Shallow Draft Crossings Deep Draft Crossings Beneficial Use Sites New Orleans Harbor Berwick Bay Harbor & GIWW Mississippi River Dredging Sites remote from potential Beneficial Use (BU) sites: Miss River-Shallow Draft Crossings, Miss River-Deep Draft Crossings, New Orleans Harbor, Berwick Bay Harbor, GIWW Houma Navigation Canal, Terrebonne Bay/Cat Island Pass – existing oyster leases prohibit BU of dredged material in Terrebonne Bay

Projects with 100% Federal Standard BU Placement Sites Mermentau Freshwater Lafourche Barataria Tiger Pass South Pass Baptiste Collette Beneficial Use Sites BU Sites are located adjacent to navigation channels Little, or no, environmental, landowner, oyster lease impediments 2. Most BU efforts/placement sites are “unconfined” (no retention dikes required)

Projects with Some Federal Standard BU Placement Sites Atchafalaya River Beneficial Use Sites Houma Southwest Pass Calcasieu River BU Sites adjacent to navigation channels BU efforts typically “unconfined” Non-BU primarily for ODMDS use (Calcasieu, Atchafalaya, Southwest Pass)

West Bay Sediment Diversion - Mile 0.0 South Pass Southwest Pass Pass a Loutre West Bay Sediment Diversion Cubit’s Gap Burrwood Bayou Mile 10.0 BHP Mile 17.0 BHP Mile 10.0 AHP ODMDS HDDA Mile 22.0 BHP Mississippi River SOUTHWEST PASS Mile 10.0 AHP to Mile 22.0 BHP LEGEND Dredging Reach Open Water Placement Sites O&M primarily accomplished using Hopper Dredges Nature of shoaling due to efforts in maintaining full authorized channel dimensions all year round Cutterheads are not used in Head of Passes and Jetties reaches where channel bends (navigation safety issues) Hopper Dredges dump in ODMDS and Head of Passes hopper dredge disposal area (HDDA) No direct Beneficial Use (BU) of dredged material Cutterhead dredges performing maintenance of the Southwest Pass navigation channel deposit material on either side of the channel in shallow open water areas for coastal habitat (i.e., emergent and high marsh) creation/restoration. 3. HDDA maintenance dredging = 100% BU (cutterhead dredge) Necessary to maintain disposal capacity of HDDA for Head of Passes hopper dredge use Indirect BU for Southwest Pass O&M

MISSISSIPPI RIVER DEEP DRAFT CROSSINGS Lake Pontchartrain New Orleans Baton Rouge Belmont Crossing LaBranche Wetlands The estimated cost to transport 1 million CY Dredged Material from Belmont Crossing to the LaBranche Wetlands site is about $26 million (using either of the 2 transportation alternatives investigated) Belmont Crossing is the annually dredged site located nearest to the LaBranche Wetlands site (approximately 31 miles distance following the Miss River alignment & crossing the Bonnet Carre Spillway property) Pumping dredged material from the crossing to this site via cutterhead dredge pipeline not economically feasible due to amount of pipeline & booster pumps required (also doubtful if any dredging contractor has sufficient pipeline to meet this need – would need to purchase additional pipeline, which would further drive up the costs) Plan 1 uses 25 hopper barges and 3 booster pumps in addition to a hopper dredge working at the crossing: barges travel Miss River to Bonnet Carre Spillway and then dredged material is pumped from barges across spillway property northwards to reach the eroded marsh LaBranche Wetlands placement site (total distance of about 31 miles). Plan 2 uses 84 hopper barges and no booster pumps in addition to a hopper dredge working at the crossing: barges travel Miss River to IHNC Lock and then travel across Lake Pontchartrain to reach the LaBranche Wetlands placement site (total distance of about 84 miles).

Southwest Pass Calcasieu River Lafourche Barataria CWPPRA - O&M Program 1. 1,514 acres of coastal habitat restored under CWPPRA 2. 6,217,041 CY of dredged material from 6 projects (1996 – 2015) Calcasieu River – CWPPRA sites (6) are all located in the Sabine National Wildlife Refuge (5,516,810 CY = 1,329 acres) Bayou Lafourche/Port Fourchon – West Belle Pass CWPPRA site (426,202 CY = 168 acres) Barataria Bay Waterway – CWPPRA project on Queen Bess Island to restore barrier island habitat for nesting brown pelicans (51,950 CY = 0 acres) Southwest Pass – CWPPRA demonstration project using a dustpan dredge (BEACHBUILDER) with flexible pipeline to perform maintenance dredging in Southwest Pass with dredged material being discharged to create emergent marsh in shallow open water areas in West Bay (222,079 CY = 17 acres)

Continuing Authorities Program 1 Continuing Authorities Program 1. 1504 acres of coastal habitat restored using Section 204 & 1135 2. 13,166,597 CY of dredged material from 4 projects (1991 – 2003) 3. $5,485,852 (average = $3648 per acre) Calcasieu River Houma Barataria Beneficial Use Sites MR-GO

Cubic Yards From Fiscal Year (FY) 1996 through FY 2015: Average Annual CY Average Annual BU CY From Fiscal Year (FY) 1996 through FY 2015: Average annual CY = 74.4 million CY Average annual BU paid for by MVN O&M program = 14.9 million CY (20%) Average annual BU paid for by Others = 1.4 million CY (1.9%) Average annual BU CY = 16.3 million CY (22%) Average annual Non-BU CY = 58.1 million CY (78%) BU O&M = beneficial use of dredged material paid for by MVN project O&M funds BU Other = beneficial us of dredged material paid for by programs other than MVN O&M funding (such as CWPPRA, CIAP, Section 204, Section 1135, and Contributed Funds) Non-BU = dredged material not used beneficially