20011202 Ver 1_Complete File_20010809

O?O? W AT ?RQG
7
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Michael F. Easley
Governor
William G. Ross, Jr., Secretary
Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
September 25, 2001
DWQ Project # 01-1202
Dare County
Page 1 of 2
Department of the Army - Wilmington District, Corps of Engineers
Colonel James W. DeLony, District Engineer
C/o: Mr. Ben F. Wood, PE, Chief, Technical Services Division
PO Box 1890
Wilmington, NC 28402-1890
Re: Wanchese Marsh Creation and Protection Project, Wanchese, Dare County, NC
Roanoke Sound / Broad Creek [03-01-51, 30-21-7, SA HQW]
APPROVAL of 401 Water Quality Certification
Dear Sir,
You have our approval, in accordance with the attached conditions, to fill eight (8) acres of waters to construct the proposed
marsh creation and protection project as you described within your application dated August 7, 2001 and received by the Division of
Water Quality (DWQ) on August 9, 2001. After reviewing your application, we have decided that this fill is covered by General
Water Quality Certification Number 3256. This Certification allows you to use Nationwide Permit No. 27. In addition, you should
get any other required federal, state or local permits before you go ahead with your project including (but not limited to) CAMA
Permit, Coastal Stormwater Permit, and Sediment and Erosion Control Permit if required. Also, this approval will expire when the
accompanying 404 permit expires unless otherwise specified in the General Certification.
This approval is only valid for the purpose and design that you described in your application. If you change your project, you
must notify us and you may be required to send us a new application. If the property is sold, the new owner must be given a copy of
this Certification and approval letter and is thereby responsible for complying with all conditions. For this approval to be valid, you
must follow the conditions listed in the DWQ General Certification No. 3256.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You must act within 60
days of the date that you receive this letter. To ask for a hearing, send a written petition, which conforms to Chapter 150B of the
North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, NC 27699-6714. This
certification and its conditions are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act. If you have any
questions, please telephone Mr. John Domey at 919-733-9646 or Ms. Deborah Sawyer at 252-946-6481.
Sincerely,
Attachment: GC 3256
Cc: Deborah Sawyer, DWQ Washington Regional Office
File Copy
Central Files
DWQ 011202
North Carolina Division of Water Quality, 401 Wetlands Certification Unit,
1650 Mail Service Center, Raleigh, NC 27699-1650 (Mailing Address)
2321 Crabtree Blvd., Raleigh, NC 27604-2260 (Location)
919-733-1786 (phone), 919-733-6893 (fax), http://h2o.enr.state.nc.us/ncwetlands/
MEMORANDUM
TO: John Dorney
Non-Discharge Branch
Regional Contact: Tom Steffens
WO Supervisor: Boger Thorne
Date:
SUBJECT: WETLAND STAFF REPORT AND RECOMMENDATIONS
Facility Name USCOE `Wilmington Dist Wanchese Marsh County DARE
Project Number 01 1202 County2
Recvd From COE Region Washington
Received Date 8/9/01 Recvd By Region
Project Type wetland' restoration
Certificates Stream'
Permit Wetland Wetland Wetland Stream Class Acres Feet
Type Type Impact Score Index Prim. Supp. Basin Req. Req.
27 atcrs 7-,;7--
ti' O N F? 30-21-7 SA 30,151. ?-
Mitigation Wetland
MitigationType Type Acres Feet
Is Wetland Rating Sheet Attached? 0 Y 0 N Did you request more info? 0 Y 0 N
Have Project Changes/Conditions Been Discussed With Applicant? 0 Y 0 N
Is Mitigation required? 0 Y 0 N Recommendation: OQ Issue 0 Issue/fond 0 Deny
Provided by Region: Latitude (ddmmss) Longitude (ddmmss)
Comments:
Issue w/ no conditions
Regional Office
Central Office Page Number 1
I x.tAUt C:h`EC1tLI5T
Project Name:
• (,??.? e.5 e ?-? Gas ? -??? ?'? t?s-'r.??-<-?-? ???
Project Number 01 --1ZOZ
County:
FILE cop
The attached projec: his be=a sent to you for re•Rew for the following reasons. Please consider whether a
site visit is needed to demrmine the impacts. Particular aaention should focus on the below checked items.
Please feel fee to tail the czn al once staff, member assigned to your region if you need assistancc.
Stream Ien;th impacted.
Stream deter na_on (Le- intermittent or perennial, or any channel present).
Wetland impact a --d distance to blue-line surface waters on USGS topo snap.
_ Minimizationlavoidance options.
i
:IW 14. (is access to his,1Qround or wetlands)? '
Meuse buffer rules- ;
Pond (water) fill (Le. is the pond drained or holding water)? '
Pond -cation (i_e. in uplands, in a drained channel, or in wetlands). Please locate streams and
channels (if any) so that the c=naral office can determine.
,
ltitigation ratios-
. ?
Stormwater pond placed in wetlands.
,
Ditching in wed. ads. ,
Is the applicant's proposed streamlwetland mitigation site awtii?hie viable? _
Applicant/cousult ant has a history of non-compliance (check drawings and application for
accurac/).
Has project been split from previous work to avoid mitigation requirements?
- - - - YY Consistent a+tth pre application me unQs'? - -- _ - - - _ = -- _
Cumulative imoact concerns
OTHER: K x
?t - - - t--
t 7- 7!
DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS......,_ .
z -(
P.O. BOX 1890 :!I !y U E3
WILMINGTON, NORTH CAROLINA 28402-1894
q' it
IN REPLY REFER TO q (IgurJ`t 7, 2001 f ref I?
Environmental Resources Section `}x
Mr. John Dorney
Division of Water Quality, Wetlands Unit
North Carolina Department of Environment
and Natural Resources
Parkview Building
2321 Crabtree Boulevard
Raleigh, North Carolina 27604
Dear Mr. Dorney:
011202
Enclosed is a revised application for water quality certification, pursuant to Section
401 of Public Law 95-217, for the construction of the Wanchese Marsh Creation and
Protection project, under the authority of Section 204 of the Water Resources
Development Act of 1992, as amended. The Section 204 Draft Feasibility Report and
Environmental Assessment for this project has been previously provided. The
Addendum dated May 2001, is also enclosed.
Should you have any questions concerning the application, please contact
Mr. Chuck Wilson, Environmental Resources Section, at [phone].
Sincerely,
W
Ben F. Wood, P.E.
Chief, Technical Services Division
Enclosures
PAYMENT
RE-CEIVED

-2-
Copy Furnished:
Ms. Debra Sawyer
North Carolina Division of Water Quality
Washington Regional Office
943 Washington Square Mall
Washington, North Carolina 27889
i A
i E U.S. ARMY CORPS OF ENGINEERS
APPLICATION FOR 401 WATER QUALITY CERTI'`it
FOR
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AUG- 9 200!
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WANCHESE MARSH CREATION AND PROTECTION PROJECT, NC
011202
1. DATE: August 7, 2001
2. NAMEIADDRESS: U.S. Army Corps of Engineers
Wilmington District
P.O. Box 1890 4 r" 0
Wilmington, North Carolina 28402-1890 eAA
3. RESPONSIBLE INDIVIDUAL: James W. DeLony
Colonel, U.S. Army
District Engineer
4. NAME OF CORPS OF ENGINEERS CONTACT: Mr. Chuck Wilson
TELEPHONE NUMBER: [phone]
5. TYPE OF APPLICATION: Revised Application
6. PROJECT NAME: Wanchese Marsh Creation and Protection Project, NC.
7. DESCRIPTION OF PROPOSED WORK: The proposed action is described in detail in
the previously provided Section 204 Draft Feasibility Report and Environmental
Assessment. Wanchese Marsh Creation and Protection Proiect. NC, dated March 1999
and in the Addendum dated May 2001 (Attached).
8. PURPOSE OF PROPOSED WORK: The marshes of Roanoke Sound are important
habitat for fish and wildlife resources and support recreational and commercial activities
that rely on these resources. These marshes are eroding at an accelerated rate.
Wanchese Marsh Creation and Protection, North Carolina, is proposed for construction
under the authority of Section 204 of the Water Resources Development Act of 1992, as
amended. The proposed plan involves the construction of estuarine creek and marsh
habitat using dredged material from maintenance of the Manteo-Oregon Inlet Channel and
Side Channel to Wanchese, a portion of the Manteo (Shallowbag) Bay project and
enhancing the area by the application of oyster cultch. This project will restore or enhance
about 8 acres of estuarine creek and marsh habitat and protect 2 acres of adjacent marsh
currently threatened by erosion. In addition the project will restore approximately 1.5 acres
of marsh currently dominated by Phragmites, just north and adjacent to the proposed
marsh/creek habitat. Therefore, a total of 11.5 acres of valuable estuarine marsh habitat
that will be either enhanced, restored, or protected by this project. About 1 acre of existing

aquatic habitat will occupied by stone rip-rap for construction of a protective dike, required
for the long-term protection of the constructed habitat. The submerged outer perimeter of
the stone dike (about .4 acres) will be planted with oyster cultch to provide added
structural habitat and improve conditions for establishment of oysters within the site. This
action is considered a beneficial use of dredged material. The proposed project would be
located in Roanoke Sound at Wanchese Harbor adjacent to the channel from Oregon Inlet,
Dare County, North Carolina. The project site is north of and adjacent to the entrance of
Wanchese Harbor, located on the southeastern corner of Roanoke Island, North Carolina.
9. PROPOSED ACTIVITY TO BEGIN: July 2002, depending on funding.
10. DURATION OF ACTIVITY: Subject to the availability of funds, project construction
activities are proposed to be initiated by July 2002 and be completed in or about May
2004. The construction period will also include annual monitoring and potential
remediation that will occur during the 3-year establishment period ending in October 2006.
Placement and excavation for filling of the base sandbags or geo-tube and other activities
associated with construction of the containment structure are expected to take about 6
months to complete and will begin prior to the October 1 - March 31 dredging window.
Dredging and material disposal will occur within the existing dredging window to the
degree practical. Grading will be conducted within a containment structure and seasonal
restrictions for this activity are not proposed. Planting will be conducted during the months
of March - May.
11. DISCHARGE OF:
X Dredged Material
X Fill Material
12. LOCATION OF DISCHARGE:
Municipality: Wanchese, North Carolina
County: Dare
Drainage Basin: Roanoke Sound
Receiving Waters: Roanoke Sound
13. NATURE OF RECEIVING WATERS:
Type: Coastal
Nature: Estuarine
Direction of Flow: Variable (tidal sound)
14. TYPE OF DISCHARGE INCLUDING CHEMICAL COMPOSITION: Temporary and
permanent sand dikes will be constructed from sandy material from the interior of the
2

construction site, island H or an appropriate upland source. Permanent dikes construction
will require placement of a geo-tube and/or sandbags and armor stone and bedding stone.
Materials proposed for marsh/creek construction include Wanchese Harbor Channel
sediments that are predominantly (85 - 90 percent) highly organic, black, silts and clays
and sediments of adjacent reaches (Tangent 14) of the Oregon Inlet to Manteo Channel,
which contain higher percentages of sand (50 - 75 percent). Sediment sampling is
described in the environmental assessment, section 3.03 and Attachment C.
15. PROJECTED FUTURE VARIATION IN THE NATURE OF THE DISCHARGE:
None.
16. IS THIS PROJECT LOCATED IN A WATERSHED CLASSIFIED AS SA, HQW, OR
ORW?
X YES (circle one) _ NO
17. NUMBER OF ACRES OR VOLUME OF WETLANDS IMPACTED BY THE
PROPOSED PROJECT:
Filled: About 9 acres of primarily unvegetated, estuarine waters with a remnant
marsh fringe. About 0.5 acres of marsh would be filled to tie in the dike and
constructed marsh to the existing shoreline. Net increase in vegetated wetlands
of about 4 acres is expected.
Excavated: None.
Total Impacted: 9 acres.
18. STATE REASONS WHY THE APPLICANT BELIEVES THAT THIS ACTIVITY MUST
BE CARRIED OUT AS PLANNED. ALSO, NOTE MEASURES TAKEN TO MINIMIZE
WETLAND IMPACTS: This action is considered a beneficial use of dredged material.
The Wanchese marsh project was recommended as a pilot site for wetland restoration by
the Beneficial Use of Dredged Material Work Group (an interagency committee of State
and Federal resource agencies) at a December 5, 1996, meeting hosted by the U.S. Fish
and Wildlife Service (USFWS). Individuals from the USFWS, National Marine Fisheries,
U.S. Army Corps of Engineers, North Carolina Division of Marine Fisheries (NCDMF),
North Carolina Division of Coastal Management, North Carolina Division of Water
Resources, North Carolina Wildlife Resources Commission, North Carolina Division of
Water Quality, and North Carolina Public Health, Pest Management, are represented in
this group.
• A temporary sand dike or sandbags will be used to temporarily increase the
height of the containment structure as needed to assure the initial containment of
dredged materials during construction.

• The project design was modified in response to agency requests to reduce the
permanent dike height and improve tidal circulation within the site. The addition of
oyster shell was incorporated into the proposed plan and a central creekwas added
to the constructed marsh to increase the length of marsh/water interface.
19. HAVE ANY SECTION 401 CERTIFICATES BEEN PREVIOUSLY REQUESTED FOR
USE ON THIS PROPERTY?
X YES _ NO IF YES, EXPLAIN: Previous application submitted April 20,
1999 was not processed since a processing fee was not included with the application.
I certify that all information contained herein or in support thereof is true and correct
to the best of my knowledge.
DATE: p 1
4,t,LBen F. Wood, P.E.
Chief, Technical Services Division
Attachments
For prompt processing, submit:
* Seven (7) copies of completed application and Addendum.
4
US Army Corps
of Engineers -
Wilmington District
A
y-
m'
ADDENDUM
011202
_ SECTION 204 FINAL FEASIBILITY REPORT
AND
FINDING OF NO SIGNIFICANT IMPACT
WANCHESE MARSH CREATION AND PROTECTION,
DARE COUNTY, NC
it
JULY 200'1

TABLE OF CONTENTS
ITEM
PAGE No.
1.0 PURPOSE .....................................................................................................1
2.0 BASIC PLAN ................................. ............................................................... 1
.
3.0 PLAN MODIFICATIONS ................................................................................ 1
3.1 SOUTH DIKE MODIFICATIONS ........................................:................. 3
3.2 EAST DIKE MODIFICATIONS .............................................................6
3.3 REVISED ACREAGES ........................................................................ 6
4.0 PROPOSED CONSTRUCTION SCHEDULE ................................................ 9
5.0 PLAN IMPLEMENTATION ............................................................................ 9
6.0 STATUS OF ENVIRONMENTAL COMPLIANCE .......................................... 9
7.0 PROJECT COSTS ......................................................................................10
8.0 PROJECT BENEFITS ...............................................
9.0 NON-FEDERAL RESPONSIBILITIES .........................................................12
10.0 SCHEDULE ...............................................................................................12
11.0 FINANCIAL DATA ............................................................... 13
......................
12.0 FEDERAL ALLOCATIONS TO DATE ....................................................... 14
13.0 SUMMARY ................................................................................................14
1
LIST OF FIGURES
Figure AD-1. General Plan View - Modified Plan ................................................. 2
Figure AD-2. Typical Sections - Modified Plan .................................................... 4
Figure AD-3. Temporary Containment Dike - Plan View ..................................... 5
Figure AD-4. Habitat Type - Modified Plan .......................................................... 8
TABLE OF CONTENTS (confd)
ITEM
PAGE No.
LIST OF TABLES

Table AD-1 ...................... HABITAT ACREAGES-MODIFIED PLAN 7
Table AD-2 ..........................TOTAL PROJECT COST SUMMARY 11
LIST OF ATTACHMENTS
a
Attachment 1. Letter, State of North Carolina Department of Environment
and Natural Resources, Division of Water Resources,
dated June 18, 2001.
Attachment 2. Letter, State of North Carolina Department of Environment
and Natural Resources, Division of coastal Management,
dated November 2, 1999.
Attachment 3. MCACES Cost Estimate - Modified Plan, Wanchese Marsh
w/sandbags, 4/25101.
ADDENDUM
SECTION 204 FINAL FEASIBILITY REPORT
AND
FINDING OF NO SIGNIFICANT IMPACT
WANCHESE MARSH CREATION AND PROTECTION PROJECT, NC
1.0 PURPOSE: This addendum to the Section 204 Final Feasibility Report serves to
document changes to the Wanchese Marsh Construction and Protection Project following
review by various agencies as well as the Corps of Engineers. The proposed changes are
primarily the result of an effort to reduce the scope and associated costs of the project
without reducing the level of environmental outputs. As a result of these changes, the first
cost of the project has been reduced by $284,000, and the unit cost of marsh created or
protected has decreased from $196,400 per acre to $146,100 per acre, or a decrease in
per acre cost of about 26%.
2.0 BASIC PLAN: The basic plan remains unchanged from that recommended in the
final Section 204 report and involves the construction of estuarine creek and marsh habitat
using dredged material from maintenance of the Manteo to Oregon Inlet Channel and Side
Channel to Wanchese, a portion of the Manteo (Shallowbag) Bay project. The creek and
marsh habitat will be constructed immediately north of the entrance into Wanchese Harbor
and will be protected by a dike along the southern and eastern sides of the new habitat.
The southern portion of the dike will parallel the existing harbor entrance channel for
approximately 500 feet and then turn north and parallel the shoreline for an additional 700
feet. The dike will tie into the existing marsh on the southwest end, while the northern end
of the dike area will be open to allow circulation of water and tidal exchange with Roanoke
Sound. The basic footprint of the dike is shown in Figure AD-1 and is generally the same
as reported previously.
3.0 PLAN MODIFICATIONS: Modifications to the plan are the result of a re-design effort
aimed at reducing the size and hence cost of the dike. The typical sections of the prior
recommended plan are shown on Figure 3 of the original report. As indicated on the
figure, the dike consisted of a geo-tube core protected with stone rip-rap. The stone had a
final crest elevation of +4.7 ft, msl, throughout. The south dike also included a permanent
sand portion built to a top elevation of +8.3 ft, msl. The marsh habitat area has a maximum
elevation of 1.5 feet msl along the leeward edge of the dike and existing marsh shoreline
and slopes toward the middle of the marsh to allow for proper flooding and drainage to the
central creek.
The primary function of the dike is to provide protection to the newly
constructed marsh. Once established, the dikelmarsh system will in turn eliminate
erosion of the existing marsh shoreline and also provide protection to the harbor
entrance. In re-designing the dike, greater emphasis was placed on reducing the
elevation of the dike to a minimum necessary to provide initial protection of the dredged
material until the marsh could become established. After establishment, the dike would
continue to protect the perimeter of the, marsh from wave action that could undermine
the root mat in a manner similar to the erosion along the present shoreline. Further, the
secondary benefits of providing shore protection for the existing marsh, plus providing
wave protection in the harbor, would be generated through the combined effect of the
dike/marsh system. During more extreme storm events, the dike will be over-topped
allowing waves to propagate onto the new marsh habitat. The prior design minimized
the wave action by reducing the degree of overtopping by maintaining a higher dike
elevation. The proposed modification relies more on the ability of the new marsh to
naturally dampen waves that overtop the dike during higher storm events. In this
manner, the combined marsh/dike system would provide adequate protection of the
shoreline and harbor entrance during the more extreme storm events.
The comparable sections of the south and east dike following the re-design are
shown in Figure AD-2. A discussion of specific design changes is given below.
3.1 South Dike Modifications. The prior design of the south dike included a
permanent sand section placed along the landward side of a geo-tube core protected with
rip-rap. The first change involves using large sandbags as an option to the geo-tube for
the core of the dike. Actual costs incurred with the installation of a geo-tube at Battery
Island, a similar project constructed in the lower Cape Fear River, showed somewhat
higher costs than originally estimated. Therefore, the modified design and the associated
costs are based on the use of large sand bags stacked in a pyramid section as shown in
Figure AD-2. However, the cost difference is such that the geo-tube remains as a viable
option to the plan and will be offered as an equivalent option for construction. The second
change involved reducing the elevation and size of the south dike. This was accomplished
by removing the permanent sand dike that had a crest elevation of +8.3 ft, msl and an
overall base width of about 35 feet. The function of the sand dike was two-fold. First, it
served to contain the initial placement of dredged material along the entrance channel.
Secondly, as an incidental benefit, it afforded substantial protection to the harbor entrance
from storm surge and attendant wave action. The first function of the dike is now
accomplished through the extension of a smaller temporary sand dike along this portion of
the south structure. The temporary containment dike now extends around the entire
perimeter of the proposed dredged material as shown on Figure AD-3. In regard to the
second function, the degree of protection provided by the permanent dike at elevation +8.3
ft, was equivalent to a 50-yr storm. This level has now been reduced to about a 5-yr event
by increasing the crest elevation of the stone portion of the dike from +4.7 ft, msl to +6.0 ft,
msl. Several other modifications have been made to the stone portion of the dike to
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improve the design and lower the cost. These include; steepening the outer slope of
the structure from 3H:1 V to 2H:1 V, replacing a portion of the larger armor stone with
smaller less costly bedding/core stone, and re-positioning the rip-rap so that none of the
large armor stone is placed directly over and in contact with the more fragile sandbag
(or geo-tube) core.
3.2 East Dike Modifications., Design modifications made to the east dike are
similar to those described above for the south dike, and include a sand bag core and a
lower overall crest elevation. The former plan had the top elevation of the protective rip-rap
at +4.7 ft, msl. The top of the dike has now been lowered to only +1.5 ft, msl, an elevation
equal to the maximum grade elevation of the constructed marsh. At this height, the dike
will prevent the toe of the marsh from being undermined but water levels are expected to
overtop the dike several times per year or more. This places a greater burden on the
plantings to withstand the more extreme storm conditions, particularly during the initial
establishment period. Once established, the plantings should be able to sustain such
events with the given toe protection, and in turn provide adequate wave dampening to the
harbor. As with the south dike, the same structural modifications have been made to the
stone section. These include the steeper side slope, greater use of core stone, and no
direct placement of armor on the sandbags (geo-tube).
3.3 Revised Acreages. The final project will encompass an area of about 12.1
acres including; (1) an 8.6 acre construction area that is primarily open sound waters, (2) a
2 acre high marsh that will be protected by the proposed construction and (3) 1.5 acres of
Phragmites to be removed by chemical control and replaced by native grasses. The
project includes construction of an estuarine marsh and shallow water habitat including,
zones of un-vegetated mud flat, low marsh, high marsh, submerged stone planted with
oyster cultch. Stone exposed above mean high water (0.6 acres) will be present but is not
considered aquatic habitat. The zones for the various habitat types are shown in Figure
AD-3, based on the modified plan. The associated acreages for each habitat type are listed
in Table AD-1. The submerged outer perimeter of the stone dike (approximately 0.4 acres)
will be planted with oyster cultch to provide added structural habitat and improve conditions
for establishment of oysters. Overall, 8.0 acres of estuarine marsh/shallow water habitat
will be constructed with the project. In addition, the project will protect about 2.0 acres of
existing marsh and also restore marsh vegetation on approximately 1.5 acres just north
and adjacent to the proposed construction area. This latter site (formerly estimated to
cover 3.0 acres) is presently dominated by Phragmites, which is considered a noxious
aquatic weed in North Carolina. Chemical control of this species and establishment of
native grasses in this area was proposed in the recommended plan; however, the restored
acreage was not accounted for in the final acreage tabulation. Therefore, with
implementation of the modified plan, a total of 11.5 acres will either be restored or
protected. Qualitative function of the estuary is evaluated in Attachment A of the EA.
6
TABLE AD-1
HABITAT ACREAGES-MODIFIED PLAN
Constructed Habitat Acreage
Creek 1.0
Mud Flat 1.8
Low Marsh (Spartina altemiflora) 3.5
High Marsh (Spartina sp. & Juncus.) 1.3
Riprap (exposed at mean high water)* 0.6
Riprap w/Oysters (sub-aqueous) 0.4
. Subtotal 8.6
Restored or Protected Habitat
Existing Marsh (Protected) 2.0
Restored Marsh (Phragmites to native grasses) 1.5
Subtotal 3.5
Total Habitat 12.1
Total Aquatic Habitat 11.5
Notes* Riprap, exposed at mean high water is considered non-aquatic and is not
included in project habitat output totals
7
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4.0 PROPOSED CONSTRUCTION SCHEDULE: Subject to the availability of
funds, project construction activities are proposed to be initiated by May 2002 and be
substantially complete in or about May 2004. Placement and filling of the sandbag (or
geo-tube) and other activities associated with construction of the containment structure
are expected to take about 6 months to complete. It is proposed that this work will be
conducted in the summer so that the site is available during the September 1 - March
31 dredging window for disposal of dredged materials. Dredging and material disposal
for this project will occur within the existing dredging window to the degree practical.
Grading will be conducted within a containment structure and seasonal restrictions for
this activity are not proposed. The construction period will also include annual
monitoring and additional marsh plantings as needed that will occur during the 3-year
establishment period ending in October 2006. Planting or replanting will be conducted
as needed during the months of March - May 2004, 2005, and 2006.
The U.S. Army Corps of Engineers (USAGE) will determine construction compliance.
The restoration area will be monitored by the Corps to assess long-term site conditions and
determine the degree of required replanting and other remedial actions for a 3-year
establishment period. Details of the monitoring plan and. success criteria are included in
the Finding of No Significant Impact (FONSI).
5.0 PLAN IMPLEMENTATION: The State of North Carolina has expressed strong
support for the recommended plan (see Attachment 1, Minutes of the Beneficial Use of
Dredged Material Work Group, dated February 12, 1997) and intends to sponsor the
project as stated in Attachment 2 (letter from the North Carolina Department of
Environment, Health, and Natural Resources, Division of Water Resources, dated June 18,
2001). The project will be constructed by the U.S. Army Corps of Engineers. The sponsor
will be responsible for the operation, maintenance, repair, and replacement of the project
during the 25-year project life. The Project Cooperation Agreement (PCA) explains the
Federal and non-Federal responsibilities and liabilities. Section 14, Financial Data,
provides the Federal and non-Federal share of project costs, information on the required
funding stream, and a breakdown of the non-Federal requirements.
6.0 STATUS OF ENVIRONMENTAL COMPLIANCE: The proposed action was
addressed in the Section 204 Draft Feasibility Report and Environmental Assessment,
Wanchese Marsh Creation and Protection Project, North Carolina (DFR/EA), dated March
1999 and prepared by the U.S. Army Engineer District, Wilmington, North Carolina. The
DFR/EA was mailed to Federal and State agencies and the interested public on March 19,
1999, for a 30-day review and comment period.
The Section 204 Draft Feasibility Report and Finding of No Significant Impact ,
Wanchese Marsh Creation and Protection Project, North Carolina (FFR/FONSI), dated
9
June 1999 was provided to Federal and State agencies and the interested public in July,
1999. Comments received on the EA and Preliminary Evaluation of Section 404 (b) (1)
Guidelines 40 CFR 230 were considered in making the decision to sign the FONSI and the
Final 404 Evaluation (dated 1 July 1999). Copies of the letters received are included as
Attachment A to the FONSI. The EA is reproduced in Appendix E as coordinated and
modifications to the proposed plan and editorial changes in response to review comments
were included in the Final Feasibility Report and the FONSI. This addendum describes
further modifications made subsequent to the FONSI.
The USFWS (letter dated March 31,1999) and NMFS (letter dated April 9, 1999) have
concurred with our finding that this project is not likely to adversely affect any federally
listed or currently proposed endangered species or their critical habitat. These letters are
included in FFR/FONSI Attachment A.
The state of North Carolina Division of Coastal Management (letter dated November
2, 1999 attached) has provided their concurrence that the project is consistent with the
North Carolina Coastal Management Program.
This Addendum will be provided to interested regulatory agencies and the public for
their information. No additional National Environmental Policy Act (NEPA) documentation
is proposed since the basic plan remains unchanged from that addressed in previously
referenced NEPA documents. The proposed modifications to the plan are the result of a re-
design effort that reduced the size and associated cost and impacts of the dike. We
conclude that the environmental coordination and agency clearances, including
endangered species, CAMA consistency would apply to the project as described in this
addendum.
A 401 Water quality Certification has been requested from the State of North Carolina
and certification is expected. A Sedimentation and Erosion Control plan will be submitted
to and approved by the North Carolina Division of Land Resources 30 days prior to any
land disturbing activity.
7.0 PROJECT COSTS: The updated project costs are given in Table AD-2. These costs
are computed using the M-CACES estimating system based on revised quantities of the
modified plan. The standard M-CACES estimate is given as attachment 2 to this
addendum. As presented in Table AD-2, the total project cost is $1,680,000. This includes
feasibility study phase costs of $198,000, plans and specifications phase costs of
$103,000, and construction phase costs of $1,379,000. The total project cost is $284,000
less than the prior total cost (see Table 1 of the original report) In terms of unit value of
marsh habitat, the former plan had a cost of $196,400 per acre ($1,964,000/10 acres).
The modified plan has a unit value of $146,100 per acre ($1,680,000/11.5), or about a 26%
decrease in the per acre cost. The life expectancy of the project is estimated to be 25
years. Amortizing $1,680,00 over 25 years at 6 3/8 percent results in an annual cost of
10
$144,000, which includes $8,000 for annual operation and maintenance. The annual cost
per acre is $12,500.
TABLE AD-2
WANCH'ESE MARSH CREATION
TOTAL PROJECT COST SUMMARY
SECTION 204 PROJECT
Cost Cost
Acct Estimate Contingency Total

22 Feasibility Study 198,000 0 198,000
Total - Feasibility Phase $ 198,000 $0 $198,000
01 Federal Real Estate Costs 1,800 200 2,000
30 Plans & Specifications 92,000 9,000 101,000
Total - Plans and Specs Phase $ 93,800 $9,200 $103,000
01 Lands & Damages - Non-Federal $ 8,500 $ 1,500 $ 10,000
06 Construction Contract $1,048,200 $104,800 $1,153,000
30 O & M Manual 5,100 900 6,000
30 Engineering and Design During
Construction 6,100 900 7,000
31 Construction Management 92,000 9,000 101,000
31 Project Coordination Team -
Federal 5,100 900 6,000
31 Project Coordination Team -
Non-Federal 5,100 900 6,000
31 Programs Management 51,100 5,900 57,000
31 Environmental Monitoring 30,700 2,300 33,000
Total - Construction Phase $1,251,900 $127,100 $1,379,000
Total Project Cost
$1,543,700 $136,300 $1,680,000
11
8.0 PROJECT BENEFITS: This project will provide total of 11.5 acres of estuarine marsh
and shallow habitat that will be restored or protected. In addition to the construction of 8.0
acres of estuarine marsh and shallow water habitat, 2.0 acres of adjacent marsh currently
threatened by erosion will be protected, and 1.5 acres of adjacent marsh will be restored by
replacement of non-native phragmities with native marsh species. The benefits associated
with this project are not monetary in nature. The material to construct the project and
create the marsh will come from regularly scheduled maintenance dredging of the
navigation channel associated with Wanchese Harbor. The material is normally placed on
Island H at a cost of $71,000. There is no additional cost or savings associated with using
the material to create the Wanchese Marsh. The project will also provide incidental
benefits to the docks and berthed vessels inside Wanchese Harbor.
9.0 NON-FEDERAL RESPONSIBILITIES: This project will be constructed and the marsh
established over a 3-year establishment period. This will include annual monitoring and
replanting, if necessary. Following the 3-year establishment period, the non-federal
sponsor will be responsible for operation, maintenance and repair of the project.
10.0 SCHEDULE: The estimated study and construction time required are 49 months for
the feasibility phase studies and report; 6 months for the plans and specifications phase,
which includes 4 months to advertise and award; and 26 months to substantially complete
construction. The construction schedule is timed to coordinate with maintenance dredging
of the Manteo (Shallowbag) Bay Navigation Project, Manteo to Oregon Inlet Channel and
Side Channel to Wanchese Harbor. Additional schedule details follow:
The proposed schedule is:
Submit IA for approval: 24 Apr1997
IA Approval and. Feasibility Funding by CECW: 01 Jul 1997
Submit Draft Feasibility Report for NEPA, Public Review: 19 Marl 999
Submit Final Report to CESAD: 30 Jun1999
Submit Revised Report Addendum to CESAD: 10 Jul 2001
Approval of Report, Project and PCA by CESAD: 30 Aug2001
Provide Funds to Initiate Plans and Specifications Phase: 08 Nov1999
Submit Plans & Specs to ITR: 31 Oct2001
Execute PCA: 01 Nov2001
Advertise: 01 Dec2001
Award (Construction Phase Funding IWA): 01 Mar2.002
Begin Construction of Dikes and Structures: 01 May2002
` Substantially Complete Dike Construction: 31 Oct2002
Begin Construction Dredging: 01 Nov2002
Grade and Construct Marsh: 01 Mar2004
Substantially Complete Construction: 01 May2004
Partial Replanting as Needed May 2005 and May 2006
Complete Monitoring: 01 Oct 2006
12
11.0 FINANCIAL DATA:
a. Project Cost Sharing:
Federal Non-Federal Total
Shared as Navigation (Base Cost) $ 71,000 $ 0 $ 71,000
Section 204 Project Features $ 0 $ 0 $ 0
Annual Material Placement $ 71,000 $ 0 $ 71,000
Annual LERR $ 0 $ 0 $ 0
Shared as Ecosystem Restoration $1,260,000 $420,000 $1,680,000
Section 204 Project Features $1,260,000 $410,000 $1,670,000
Material Placement, First Cost $ 0 $ 0 $ 0
LERR $ 0 $ 10,000 $ 10,000
Total Project Cost $1,331,000 $420,000 $1,751,000
Section 204 Project Features $1,260,000 $410,000 $1,670,000
Material Placement $ 71,000 $ 0 $ 71,000
LERR $ 0 $ 10,000 $ 10,000
Rounded to nearest thousand
b. Ecosystem Restoration Costs ($1,000):
Phase Totals Non-Fed Fed
Feasibility $ 198 $ 0 $ 198
P&S $ 103 $ 0 $ 103
Construction $1,379 $ 420 $ 959
Total $1,680 $ 420 $1,260
Federal Funding
#hr00 FY 01 FY 02 FY03
$184 $14 $ 0 $ 0
$ 0 $61 $ 42 $ 0
$ 0 $ 0 $500 $200
$184 $75 $542 $200
Needs
FY04 BTC
$ 0 $ 0
$ 0 $ 0
$ 120 $139
$ 120 $ 139
Note: The feasibility phase and plans and specifications are initially federally financed, and
costs are distributed as part of the non-Federal share of project costs during
implementation.
c. Non-Federal Requirements:
(Ecosystem Restoration)
LERRD $ 10,000
Cash $404,000
Work-in-Kind $ 0
Project Coord Team $ 6,000
AnnualOMRR&R $ 8,000
13
12.0 FEDERAL ALLOCATIONS TO DATE: Initial Appraisal: $ 10,000
Feasibility Phase: $ 198,000
Plans and Specifications: $61,000
Construction: $ 0
13.0 SUMMARY: The project has been modified in an effort to reduce the scope and
associated costs of the project without reducing the level of environmental outputs.
As a result of these changes, the first cost of the project has been reduced by
$284,000 and the unit cost of marsh created or protected has decreased from
$196,400 per acre to $146,100 per acre ($1,680,000111.5), or about a 26% decrease
in the per acre.cost. The benefits associated with the ecosystem restoration project
have been updated and reviewed by the Wilmington District and weighed against the
project costs. We believe the importance of this habitat to the aquatic community is
greater than the cost to create and protect the marsh and creek habitat. The
modified plan is the appropriate size in that it creates valuable marsh and creek
habitat within the area available and protects this area from future erosion for the life
of the project. The sponsor concurs with our recommendation. Therefore, we
recommend that the project be constructed as presented herein.
14
ATTACHMENTS
Attachment 1. Letter, State of North Carolina Department of Environment
and Natural Resources, Division of Water Resources,
dated June 18, 2001.
Attachment 2. Letter, State of North Carolina Department of Environment
and Natural Resources, Division of coastal Management,
dated November 2, 1999.
Attachment 3. MCACES Cost Estimate - Modified Plan, Wanchese Marsh
w/sandbags, 4/25/01.
Noah Carolina
Department of Environment and Natural Resources
Division of Water Resources
Michael P. Easley, Governor
William G. Ross, Jr., Secretary
John Morris, Director
June 18, 2001
Colonel James DeLony
District Engineer, Wilmington District
Corps of Engineers
Post Office Box 1894
Wilmington, North Carolina 28402
Dear Colonel DeLony:
NCDENR
Mr. Frank Reynolds of your staff sent us the Addendum to the Section 204 Final
Feasibility Report and Finding of No Significant Impact for the Wa.nchese Marsh Creation and
Protection project in Dare County. We have reviewed this document and have no comments
except to say that you have done a good job in reducing the cost of the project.
The State of North Carolina continues to support the modification of the Manteo
(Shallowbag) Bay, North Carolina Project to include the Section 204 Project entitled
Wanchese Marsh Construction and Protection, Dare County, North Carolina. The State also
intends to sponsor the project and pay for 25 percent of projects costs.
We look forward to working with the Wilmington District on this project.
, Sincerely,
Jo N. Morris
1611 Mail Service Center, Raleigh, North Carolina, 276994613
Phone: 919 - 733-4064 \ FAX: 919 - 733-3558 \ Internet: www.ncwaier.ora
AN EQUAL OFFORTUNn-f \ AFFIRMATIVE ACTION EMPLOYER- 50%REC`fCLED / 10% 1'OSTCONSLUM PAPER
r""1 -08' 00 (TUE) 09: 23 DEIHNR COSTAL MGMT TEL:[phone] P.002
CAiVZA
November 2, 1999

J
Colonel James W. Delany
District Engineer
U.S. Army Corps of Enain=erg
Wilmington District
P.O. Box 1890
Wilmington, NC 28402-2.330
REFERENCE: CD93-13 =ONSI - Wanchase Marsh Creation Project,
Dare County, NC
Dear Colonel Delony: ,
The State of North Carolina has completed its review pursuant
to 15 CFR 930 Subpart C - Consistency for.Federal Activities, of
the subject document. The project consists of constructing a
arotective dike and using dredged material to construct
approximately 8 acres or coastal wetlands near Wanchese Harbor at
Roanoke Island. The project will involve placing fill material n
the Public Trust and "Estuarine Waters Areas of Environmental
Concern. Dredged mat:_ a1 from the Wanchese Harbor entrance
channel will be deposited behind a sandbag retaining wall, graded,
and planted to construct an intertidal watland. The project is
being funded under S-ectaon 204 of the Waver Resources Development
Act of 1992, and is being sponsored by the North Carolina Division
of Water Resources.
Based upon our revi_w, we agree with the Corps` deterni.natian
t t'Lls proposed Want-^-=S? Narsh Creation Pro]ect is consistent
t ha
with the North Carolina Coastal Managamer_t ?rogr am, provided the
following.conditions ars met.
1,. A a 01 Water Quality Ce* t :.iic_tion is he oi?tained from the
Division of Water Quality, and all condicicns therein arm met.
Norrh Carolln8 4=2W of Enviranmem :std N=ral Resources • James B. Hunt Jr., Covemor - Ttyne McUMV, Secretary
r)nnna D_ MoffirL Dir%Ior
FE2. -08' 00 (TUE) 09: 24 DEHNR COSTAL NIGNIT
Colonel James W_ Delony
November 2, 1999
Page 2
TEL:[phone] - F.003
2. A Sedimentation and Erosion Control plan is submitted to and
approved by the Division'-of Land Resources. This plan must be
submitted at least 30 days prior to the initiation of. land
disturbing activities.
3. Dredging and disposal will. occur within the approved time of
year windows for these activities in Wanchese Harbor. Work outside
of the windows will require advanced coordination and approval from
the appropriate state and federal agencies- Funding and or
contractor delaye are not considered justification for working
during periods of peak biological activity-
The Division of Coastal Management continues to support the
efforts of the Beneficial Use of Dredged Material Work Group. We
appreciate the opportunity to work with the Corps and the Division
of Water'Resources on the development of this project, and we are
hopeful for its success.
f
If you have any questions regarding our finding, conditions,.
or comments, please contact Mr. Steve Benton or Me. Caroline
Bellis, Division of Coastal Management, at [phone]. Thank
you for your consideration of the North Carolina Coastal Management
Program.
Sincerely,
• Donna D. Moffitt.
i
CC., Diane Copeland, Division of Coastal Management, Elizabeth City
Charles Jones, Asst. Director, Division of Coastal Management
Chuck Wilson, ITS Army Corps of Engineers, Wilmington District
Jor-i Dorney, Division of Water Quality
Patrick McClain, Division of Land Resources
John Sutherland, Division of. Water Resources
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