Public Information Meeting 7 MARCH 2017

Transcription

1 Public Information Meeting 7 MARCH 2017

2 Outline of the Presentation Overview of the project Key dates and milestones Anticipated construction Timetable & Activities Required sea turtle monitoring during construction Planned construction management Questions and Answers

3 Project Length = 15,500 ft Total Volume = 2,600,000 cy Project Overview Project length 15,500 ft (~2.9 miles) Total Volume 2.6 MCY Average fill density 168 cy/ft Hydraulic/Hopper Dredging Offshore borrow area Summer construction for safety, efficiency and economy (Jun-Sept 2017)

4 Borrow Area 1.7 miles offshore 286 acres No-work buffer required Excavation Limit 7 ft Available Volume ~3.3 MCY

5 Sand Quality* Borrow Area 28 cores (1 per 11 acres) Mean grain size = mm fine-grain <1% Granular & gravel = 2.3% Native Beach 140 samples Mean grain size = mm fine-grain <1% Granular & gravel = 6.6% *Source: EA App C Geotechnical Data

6 Photo on 11 Sep 2014

7 Cape Hatteras National Seashore Village of Buxton

8 Overall Project Plan (1)

9 Overall Project Plan (2) Primary Staging Area 1.6 MCY (60% of Volume) 6,000 ft (270 cy/ft)

10 Primary Staging Area near South End at Decommissioned US Coast Guard Base (Approved by National Park Service)

11 Typical Fill Templates Berm Crest at 7 ft NAVD Seaside Slope at 1 on 15 (native) Initial berm width = ~250 ft Waves expected to overtop berm and shift sand landward Dune growth expected to reverse cycle of erosion Seaward half of berm expected to shift offshore and produce gentle slopes and characteristic surf zone topography Adjusted berm width = ~140 ft

12 Profile Adjustment After Nourishment 0-50 ft ~250 ft ~140 ft >19 ft

13 Key Dates and Milestones Permitting Interagency meetings Public meetings Permit applications and document preparations Permitting liaison Engineering Coastal process and engineering studies Final design Project manual Bidding Bid issuance Bid opening Selection of bidder Contracting

14 Key Dates and Milestones - Permitting Three scoping meetings with state and federal agencies 10/22/2014, 1/8/2015, and 7/29/2015 Environmental Assessment and 7 Appendices September 2015 Permit Applications to NPS, USACE, and NCDEQ September 2015 Fifty-six (56) major weekly/biweekly meetings with NPS, USACE, USFWS and Dare County Feb 2015 Mar Water Quality Certification November 23, 2015 Major CAMA Permit December 15, 2015 Biological Opinion February 8, 2016 NPS Special Use Permit March 11, 2016 USACE Permit March 14, 2016

15 Key Dates and Milestones - Bidding Bid issuance March 15, 2016 Pre-bid meeting March 24, 2016 Bid opening April 7, 2016 Selection of bidder Weeks Marine Notice of Award April 20, 2016 Contract between Dare County and Weeks April 28, 2016 Notice to Proceed May 6, 2016 $34 M $34.15 M $11 M higher than budget $800 K lower than budget

16 Anticipated Construction Timetable Pre-Construction Meeting April 2017 Contractor mobilization From May 15, 2017 Pre-Construction survey (including MHW) May 15, 2017 First day of pumping (Anticipated) June 1, 2017 Last day of pumping August 31, 2017 Post-Construction survey September 1, 2017 Post-Construction meeting Within 7 days after filling First Load at Nags Head (NC) on 24 May 2011

17 Contractor s Possible Equipment on the Beach Illustration Provided by First Coastal Photo by Lignelli Family

18 Backshore Corridor Wherever Possible Construction Activities

19 Edisto Beach (SC) Nourishment Video by CSE (Feb 2017)

20 Nags Head (NC) Nourishment Time Lapse Video by Sun Realty (July 2011)

21 Environmental Protection Measures Protection of Endangered Species at Sea (by Contractor) Non-capture trawling sweeping Deflectors and specific equipment modification Endangered species monitor onboard dredges Dredging Quality Management (Silent Inspector) Protection of Endangered Species on the Beach Day time monitors (by County & NPS) Night time monitors (by County & NPS) Lighting, storage of equipment, escarpment, etc (by Contractor)

22 Required Sea Turtle Monitoring During Construction Daily monitoring Night time monitoring Before 9 AM If sand is placed at night NEST Trained Volunteers for the 2011 Nags Head Nourishment Year Turtle Nests # along Project Area ??

23 Turtle Nesting During 2011 Nags Head Nourishment

24 Planned Construction Management Daily construction observation Weekly project meeting Periodic memo with construction updates Construction progress map Contractor s daily quality control report Dredge s daily production report Turtle monitoring daily/weekly report The County will not know the schedule for sand placement along specific areas until the project is underway. A tracking map of the oceanfront will be available on the County s web site to assist homeowners in determining the approximate week to expect work in a particular section of beach.

25 Questions and Answers (1) (1) Where is the project? ~2.2 miles in the CHNS and ~0.8 mile in Buxton (2) What is the cost of the project? $22,150,000 (3) What will the project do? Widen the beach an average of ~140 ft (4) How will the Buxton project help protect NC Highway 12? Wider beach more protection (5) When will construction begin? Anticipate on June 1, 2017 (6) Hong long will it take to place ~2.6 mcy of sand on the beach? ~3 months (7) What is the life expectancy of the project? 10 yrs under normal conditions (8) What type of dredge will be used? Cutter-suction & hopper dredges (9) How do dredges work? (10) How will the sand reach the beach? Submerged pipe (11) How will the sand be shaped? Bulldozers

26 Questions and Answers (2) (12) Will construction proceed continuously along the beach? No (13) What will be the normal area of impact each day? ft (14) Hong long before the new beach can be used? Immediately (15) Will construction activities occur at night? Yes (16) How noisy will construction be? Various (17) Hong long will it take to complete work along a section of beach? ~300 feet per day (18) What will the new sand look like? Similar color and texture (19) Will the water be muddy for a while? No (20) How long will the pipeline block my section of beach? 1-3 Weeks (21) Will the pipeline damage my dunes? No (22) Will the sand be pumped on my sandbags? No (23) Is the pipeline dangerous? Yes

27 Questions and Answers (3) (24) What are the public safety measures during the project? Fencing& Ribbon (25) Will the public be able to watch construction? Yes (26) Will the new beach produce unpleasant odors? No (27) Will the profile of the beach remain the same? Not initially (28) Will the nourished beach erode faster than the beach has in the past? To a small degree (29) Why is the project constructed in the summer? Safety, Efficiency & Economy (30) What will happen to the organisms living in the beach? Rapidly recovery (31) Will dredging leave a big hole offshore & produce a biological dead zone? (32) Will the project affect surf fishing or offshore species? No Not to the degree the season of the year affects fishing

28 More Information