Seagrass Transplantation & Environmental & Marine Consulting Services, Inc. Drew Campbell, Vice President & Lead Scientst.
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1 Indian River Lagoon Symposium Seagrass Transplantation & Project Considerations Environmental & Marine Consulting Services, Inc. Drew Campbell, Vice President & Lead Scientst March 26 th, 2013
2 Regulatory Requirements US Army Corps of Engineers: Section 10 of the Rivers and Harbors Act of 1899 (Maintain i Safe Navigation) Florida Department of Environmental Protection Sovereignty Submerged Lands: Chapter 18-20, F.A.C. (Submerged Lands within Aquatic Preserves) Environmental Resources Permit: Chapter 62-4, F.A.C. (Environmental Protection) County & Municipal Permits (Local Ordinance Dependent)
3 Seagrass Environmental Health Light Depth Trubidity Color Chlor A TSS Sediment Type Nutrients Hydrology Tides & Currents Wave Action & Scour Boat Traffic Water Quality Nutrients Salinity
4 Seagrass Transplantation Elements Site Selection Donor Site Recipient (Restoration) Site Matching Environmental Conditions (current and future) Methods Wet until planted; Fragile Manual Divers, Snorkelers, Waders with Seagrass Plugs, Peat Pots, or Staples Mechanical Seagrass Plugs or Mats
5 Seagrass Transplantation Measuring Success Bi-annual Monitoring (Growing Season) Divers or Aerial Surveys 5 Years of Monitoring Successful establishment should occur within 2-3 years Potential Variables Effecting Success Landuse & Surfacewater Run-off, Hydrology & Water Quality Civil Engineering Projects, Ex: Maintenance of Channel, Transportation Projects, etc. Public at Large: Recreational & Commercial Boat Traffic Storm Activity
6 Seagrass Transplantation as Restoration or Mitigation? As Restoration Activity vs. As Mitigation Activity Funding Dependent Mitigation Funds NEP EPA, FDEP, SJRWMD, St. Dredging, g, Coastal Construction, Lucie County, Local Sponsors Utility Transmissions, Docks, Bridges & Roadways Regional Approach Options Site Specific (on-site) Permit Approval Expedited Regulatory Challenges Proactive Action Reactive Action Mitigation Banking or Public- Private Teaming Opportunities
7 Lake Worth Lagoon Seagrasses 1940 vs Decrease in seagrass coverage in Lake Worth Lagoon 1940: 4271 acres 2001: 1630 acres 62% PBC ERM
8 Problem: Peak Discharges Transport Muck Sediments to Lake Worth Lagoon S-155 Structure
9 Muck Deposits in C-51 Canal & Lagoon Muck Deposits Cause Problems Increased turbidity, reduced light penetration Covers naturally occurring sandy sediments Muck Characteristics Highly organic fluvial sediments Fine grained (0.180 to mm) Highly mobile and easily transported
10 Project Information Needs for C-51 and Lake Worth Lagoon Existing Muck Characterizations Locations Volume Physical Characteristics Chemistry y( (Nutrients & Toxicity) Identify Potential Seagrass Habitat Restoration Areas Within the Lagoon
11 Area 1 Southern Boulevard Line 1 Area 2 Line 2 Line 3 Area 3 95 Line 4 Area 4 Belvedere Road Line 5 Area 5 Line 6 Area 6 Line 7 Area 7 Line 8 Area 8 Forest Hill Boulevard Line 9 Area 9 Line 10 Area 10 Line 11 Area 11 Legend Muck Thickness Units: Feet Line 12 Line 13 Line 14 Line 15 Line 16 S Area Area 13 Area 14 Area 15 Area Line Cross Section Locations SOURCE: Milian, Swain & Associates, Inc Ecology and Environment, Inc. SCALE 1:12, , , , , ,000 Feet Meters Figure 3.1 C-51 HYDROGRAPH SURVEY LOCATIONS AND MUCK THICKNESS
12 C-51 Canal Muck Volume Estimates Area Muck Area Sec. A (ft 2 ) Muck Area Sec. B (ft 2 ) Section Length (ft) Volume (ft 3 ) Volume (yd 3 ) , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Total 11,019, ,127
13 C-51 Sediment Management Project Area 1 mile section, Forest Hill south 121,000 cubic yards of muck $1.7 million Dredging Contract Total Cost: $18.50/cy ($2.7 million) Partners: P t PBC, SFWMD & City WPB WPB Golf Course S-155 Control Structure
14 Contours >= 10 feet Elevation CfL- NGVD 1927) S.O :ZfLO [:J t.b:tdepo615:.. 1S 0 Sel:anenl. Sampling Stations SCALE 1:2C,DOO Figu re MUCK SEDIMENT LOCATIONS, SEDIMENT SAMPUNG STATIONS AND BArnYMETRIC CONTOURS OF LAKE W O RTH LAGOON AHD ASSOCIATED POTENTlAL MANAGEMENT MEASURES
15 Lagoon Sediment Characterization and Volume Estimates Accumulation rates between 0.1 to.09 cm/yr for the last 20 years (PBC ERM 2003)
16 Challenges Removing Muck Sediments From the Lagoon Physically difficult to manage Widespread areas within Lake Worth Lagoon Easily re-suspended spended (Flow and Turbulence) Problematic dredging, transport & disposal of dredge material Costly to remove - Budget constraints
17 Proposed Solutions Shift away from dredging within Lagoon Focus on sediment load reductions (C-51 Dredging) Substrate improvement within the Lagoon Sediment Capping with native sediments Habitat Improvement (Seagrass Planting & Recruitment) Consistency with Lake Worth Lagoon Management Plan
18 Proposed Lake W orth Lagoon Pr-oject Ar-eas
19 Improving Lagoon Substrate for SAV Improve 376 Acres of Lagoon shallow water habitat Capping or Sediment Stabilization Total Acres Suitable for Habitat Enhancement Existing Seagrass and Oyster Reefs Muck Depth >1ft. deep Area remaining (50% contains muck <1ft deep) Muck Depth >1ft. deep Total Improvable Substrate for Habitat Enhancement 843 ac -158 ac (685 ac) -66 ac (619 ac) 309 ac remaining +66 ac 376 ac
20 5 Acres of Muck Capping Sample Projects Cap Muck Sediments & Create Suitable Habitat for Seagrass Recruitment & Transplantation Muck Capping Cost: $1 Million Oysters & Mangrove: $350,000
21 Sample Projects Snook Islands Phase II acres Cap Muck Sediments & Raise Elevation to Support SAV Rock Placement to Provide Oyster Habitat & Mangrove Islands Estimated Cost: $10 Million
22 Sample Projects Mangrove Islands 4 Acres of Submerged Habitat t Capping Muck Sediments - Improved Substrate Stabilization: Oyster Reef, Mangrove, Seagrass Habitat Estimated Cost: $1.1 Million
23 IRL Seagrass Evaluation Criteria Will this Work in IRL? Evaluation of seagrass resources in the lagoon is based on three measurements: Changes in the acreage of seagrass coverage over time (gain or loss) Maximum depth of the edge of seagrass beds Percent of surface sunlight reaching seagrass restoration depth targets ***** Can we significantly ifi improve the seagrass population and condition with substrate improvement and transplantation? YES!
24 Current and Upcoming Projects Current Projects (NEP-EPA: ) Activity 2 Living Resources & Water Quality Monitoring (SJRWMD) $21,300 Activity 5 Pelican Island NWR $32,400 Activity 9 Jensen Beach Mooring Field $10,000 Upcoming Projects SFWMD 8 New Projects for IRL Prevent muck sediment transport to Lagoon Canal retrofits & stabilization $400,000 Nutrient load reduction IFAS, County $200, Seagrass Health Monitoring FOS $90,000 Continued Opportunities Public/Private partnerships
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