ST. JOHNS RIVER WATER MANAGEMENT DISTRICT

Transcription

1 ST. JOHNS RIVER WATER MANAGEMENT DISTRICT Eau Gallie River & Elbow Creek Restoration Dredging Melbourne, Florida Planning, Permitting, and Final Engineering Design June 11, 2015

2 Introductions St. Johns River Water Management District Ralph Brown, P.E. (Project Manager) Woody Boynton, P.E. (Director, Division of Administrative and Operational Services) William Tredik, P.E. (Indian River Lagoon Protection Initiative Leader) Taylor Engineering, Inc. Jonathan Armbruster, P.E. (Project Manager) David Stites, Ph.D. (Environmental Services) Amec Foster Wheeler, Inc. Mike Kelley, P.E. (Survey and Geotechnical Investigations) 2

3 Presentation Outline 1) Project Problem, Objectives, and Solution 2) Project Location a) Dredging footprint b) Dredged material management footprint 3) Construction Methods a) Hydraulic dredging and pipeline b) Temporary dredged material management area (DMMA) c) Dewatering d) Permanent sediment storage 3

4 Presentation Outline 4. Project Progress a) Data Collection b) Design c) Permitting 5. Project Schedule a) Design and Permitting b) Construction 6. Questions and Answers 4

5 Project Problem Muck deposits in the Eau Gallie River and Elbow Creek damage: o Water quality and natural resources o Recreational activities o Property values o Navigability 5

6 Project Objectives Improve ecosystem characteristics o Water quality and habitat o Wildlife diversity Improve recreational opportunities o Fishable/swimmable waters Ballard Park Boat Ramp 6

7 Project Solution Restoration Dredging o Remove accumulated muck sediments o Dewater and dispose of dredged material o Avoid water quality, wetland, and species impacts 7

8 Project Dredging Limits Dredge from the confluence of the IRL with the Eau Gallie River to the Eau Gallie River Control Dam Project limits also include Elbow Creek from: o o o Confluence of Elbow Creek & Eau Gallie River Laurie Street Bridge Magnolia Avenue Bridge Upstream Eau Gallie Control Dam Downstream Eau Gallie Control Dam 8

9 Project Introduction (Overview) a) Overview b) Background Eau Gallie River Restoration Project begins at the mouth 9

10 Eau Gallie Control Dam a) Overview b) Background Eau Gallie River Restoration Project ends at the control dam 10

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12 Complete Project Footprint Sediment Management Here Dredging Here DMMA: Sediment Dewatering Dredging Pipelines Sediment Storage Melbourne Airport

13 Project Equipment on the Water Hydraulic Dredge inch hydraulic dredge Observer boats DMMA return water pipeline Booster pumps Turbidity curtains Dredge crew work boats Dredged pipelines Signs 13

14 DMMA Facility and Equipment Booster pumps Dredged material slurry pipeline DMMA return water pipeline Earthwork equipment Worker vehicles Job trailer Typical DMMA View Typical Paired Pipeline Layout 14

15 Dewatering Techniques Gravity settling (primary method) Optional methods (If necessary) o Coagulants/flocculants o Geotextile tubes o Hydrocyclones o Filter presses o Scalping pump boxes o Hydraulic scalpers and classifiers Geotextile Tubes Hydrocyclone 15

16 Final Sediment Disposal Material will be trucked from the DMMA site to Sarno Road Landfill Trucking route avoids public roads Approx. 625,000 cubic yards Truck Route DMMA Disposal 20 cubic yard dump truck 16

17 Survey & Geotechnical Data Collection Bathymetric and boundary surveys Shoreline condition survey Geotechnical investigation (water and land) Sediment chemistry o Metals, nutrients, flocculent, and coagulant testing Muck Location Muck Probe Muck Thickness 17

18 Natural Resources Surveys and Assessments Shoreline vegetation Submerged resources Wetlands delineations Upland habitat characterization Listed species assessments 18

19 Engineering Design Dredging Template 19

20 Engineering Design - Pipeline Corridor Paired pipeline o Slurry inflow and water outflow Directional drill under major roadways o Apollo Road o Wickham Road Road cuts under smaller roads 20

21 Engineering Design - DMMA Earthen containment facility Stormwater management Outflow weir Internal roads Vegetated buffers and fencing Discharge Weir 21

22 Environmental Protections Daylight (12 hours) dredge operation Contractor safety controls in project specifications Noise protection o No night time equipment operation o Noise-shielded booster pump operation In-water signs and markers for pipeline and dredging equipment Turbidity management o Turbidity not to exceed 29 NTU above background (FDEP) Manatee Protection Plan requirements Shoreline and DMMA vegetated buffers Fencing around DMMA 22

23 Permitting Required permits o FDEP and USACE o Project qualifies for restoration permits o City of Melbourne Coordination o Brevard County o City of Melbourne Airport Authority o City of Melbourne o Florida East Coast Railroad o Other private entities o EGRET 23

24 Project Schedule Permit Authorizations Federal, State, City of Melbourne Permits For DMMA construction mid-september 2015 For dredging early 2016 Construction DMMA construction Fall 2015 Dredging begins Winter Spring 2016 Project completion December

25 Questions? 25