20081764 Ver 2_CAMA Application_20100120

Beverly Eaves Perdue
Governor
kT;-,;WA 08-?IL04 Va_
NCDENR
North Carolina Department of Environment and Natural Resources
Division of Coastal Management
James H. Gregson Dee Freeman
Director Secretary
January 19, 2009 j'" j?j
MEMORANDUM: a?L 0 v I.P.
TO: Cyndi Karoly, Supervisor JAN 2 0 2ci0
401 Oversight & Express Permits Unit DENR-w1TERou&rry
Division of Water Quality-Surface Water Protection WETIANDSANDSTORMWATEReRANCH
FROM: Doug Huggett, NC DENR-DCM Major Permits Coordinator
400 Commerce Ave., Morehead City, NC 28557 (Courier 11-12-09)
SUBJECT: CAMA / Dredge & Fill Major Permit Application Review
Applicant: Town of North Topsail Beach (Shoreline Protection Project)
Project Location: north of Surf City town line to the New River Inlet, in NTB, Onslow County.
Proposed Project: beach renourishment
Please indicate below your agency's position or viewpoint on the proposed project and return
this form by February 10, 2010. If you have any questions regarding the proposed project,
contact Steve Everhart at [phone], when appropriate, in-depth comments with supporting
data is requested.
REPLY: This agency has no objection to the project as proposed.
This agency has no comment on the proposed project.
SIGNED
DATE
127 Cardinal Drive Ext., Wilmington, NC 28405
Phone: [phone] \ FAX: [phone] Internet: www,nccoastalmanagement.net
This agency approves of the project only if the recommended changes are
incorporated. See attached.
This agency objects to the project for reasons described in the attached
comments.
NorthCarolina
NI
atura!!b,
An Equal Opportunity \ Affirmative Action Employer
DIVISION OF COASTAL MANAGEMENT
FIELD INVESTIGATION REPORT
1. APPLICANT'S NAME: Town of North Topsail Beach/ North Topsail Beach Shoreline Protection Project
THIS IS A RES UBMITTAL OF APPLICATION D UE TO PHASING OF PROJECT AND HANDLING OF
UNSUITABLE FILL MATERML
2. LOCATION OF PROJECT SITE: The project site is entire beachfront of the Town of North Topsail Beach
starting just north of the Surf City town line to the New River Inlet, adjacent to the Atlantic Ocean, in North
Topsail Beach, Onslow County.
Photo Index - 2006: 28-(6487-6497): Oceanfront & Inlet
2000: 28-(380-391): Oceanfront & Inlet
1995: 28-(366-379): Oceanfront & Inlet
State Plane Coordinates - GPS File: P111811C (southern extent) & P111811B (northern extent)
X: 2449610 (C) Y: 256997 (C)
2498767(B) 286898(B)
Lat: 34°26'48.65694"N (C) Long: 77°30'31.25847"W (C)
34°31'36.68995"N (B) 77°20'38.43165"W (B)
INVESTIGATION TYPE: CAMA / D&F
4. INVESTIGATIVE PROCEDURE: Dates of Site Visit - Multiple 2004 - 2008
Was Applicant Present - Yes
PROCESSING PROCEDURE: Application Received - Complete on 01/04/10
Office - Wilmington
SITE DESCRIPTION:
(A) Local Land Use Plan - Town of North Topsail Beach
Classification From LUP - No Classification / Developed
(B) AEC(s) Involved: OH
(C) Water Dependent: Yes
(D) Intended Use: Public/Government
(E) Wastewater Treatment: Existing - Municipal Sewer
Planned -N/A
(F) Type of Structures: Existing - Commercial and Residential structures and access-ways
Planned - Shoreline Protection Project
(G) Estimated Annual Rate of Erosion: 2'/year Source - LTAASCR 1998 Update
7. HABITAT DESCRIPTION: [AREA]
DREDGED FILLED OTHER
(A) Vegetated Wetlands (coastal)
(B) Non-Vegetated Wetlands - open water 1108 acres -415 acres(shallow
bottom)

(C) Other (Highground) -230 acres(beach)
-12 acres(diked
island)
(D) Total Area Disturbed: 1,765 acres
(E) Primary Nursery Area: No
(F) Water Classification: SA Open: NO
North Topsail Beach Shoreline Protection Project
Page Two
8. PROJECT SUMMARY: The applicant is proposing to perform a beach nourishment project for the Town.
THIS ISA RESUBMITTAL OF APPLICA TION D UE TO PHASE PROJECT AND HANDLE
UNSUITABLE FILL MATERIAL
9. PROJECT DESCRIPTION:
The project site begins north of the North Topsail Beach / Surf City town line and terminates at the New River
Inlet, adjacent to the Atlantic Ocean and New River Inlet, in North Topsail Beach, Onslow County. To get to
the site from Wilmington take US HWY 17 N to NC Hwy 210, which is located at the Lowe's Home
Improvement on US HWY 17. Turn right onto NC Hwy 210 and continue across the Surf City Swing Bridge.
Take a left at the first street New River Road (NC Hwy 210). Continue on NC Hwy 210 until you reach the
North Topsail Beach / Surf City town line. This is the southern limit of the proposed project. The project site
encompasses approximately 11 miles of oceanfront beach starting north of the Surf City / North Topsail Beach
town line and terminating at the New River Inlet. New River Inlet is located at the northern tip of Topsail
Island. This is also the northern most portion of the Town. The current elevation of the project area ranges from
approximately -10' NAVD to approximately 18' NAVD. The project site is adjacent to commercial and
residential properties also infrastructure for the Town including NC Hwy 210. The project site is bordered by
Onslow Beach to the North, the Atlantic Ocean to the East, and commercial and residential properties to the
south and west. The highground portion of the property is vegetated primarily American Beach Grass
(Ammophila breviligulata) and Sea Oats (Uniola paniculata).
The Annual erosion rates for the Town ranges from 2'/year to 3.5'/year per the Division of Coastal
Management's 1998 Annual Erosion Rate maps. The applicant states that as of August 14, 2007 approximately
41 oceanfront structures are considered threaten by DCM definition, which defines a threaten structure as
having an erosion escarpment within 20' of the structural pilings of structure. The applicant also states that there
has been a substantial portion of the berm and dune system lost due to coastal storms and hurricanes. This has
resulted in a reduction in the nesting habitat for sea turtles.
The Town of North Topsail Beach currently has an active CAMA Permit, Permit # 191-05, authorizes a one-
time beach push to repair the dune system after an erosion event. The Town is required to modify the permit
prior to any bulldozing activities. The permit was issued on December 5, 2005, was renewed on January 12,
2009, and is set to expire on December 31, 2010. The Town had a previous permit issued on September 24,
1999 that expired on December 31, 2003 subsequently modified on 9/28/99, 10/17/99, and 12/10/01. It appears
that the Town has performed beach bulldozing in response to an erosion event approximately 5 times over the
course of these permits.
The Town of North Topsail Beach Land Use Plan does not have the dry sand beach classified however; the
upland areas of this project are classified as Developed. The waters of the project site are classified as SA by the
NC Division of Water Quality. The NC Division of Marine Fisheries has NOT designated this area of new New
River / Atlantic Ocean as a Primary Nursery Area, and the waters adjacent to the proposed project are open to
the harvesting of shellfish.
PROPOSED PROJECT:
The applicant is proposing a beach nourishment project for the entire Town of North Topsail Beach. The fill
area will measure approximately 68,000' in length and 414' in width. The Town is proposing to do this project
North Topsail Beach Shoreline Protection Project
Page Three
in 5-phases, please see Table 1 of the application for the proposed construction phases and sequence. The total
width of the project breaks down into two parts; the area above high water and the area below high water. Each
phase varies in width as follows: Phases 1 & 2 - 229' landward of NHW and 276' waterward of NHW; Phases 3
& 4 -164' landward of NHW and 250' waterward of NHW; and Phase 5 - 86' landward of NHW and 119'
waterward of NEW. The applicant states that they will dredge approximately 2,592,000 cubic yards of material
from inlet relocation and the off-shore borrow area. The New River inlet relocation and subsequent maintenance
excavation would be performed in an area measuring approximately 3,375' in length and 500' in width to a
final proposed project depth of -17' NGVD-29. The Town is also proposing to excavate up to 15 cuts from an
offshore borrow area, each cut would measure approximately 1,410' in length by 1,350' in width with varying
final depths. Please see figure 13 of the application for clarification on the cut area and depths. The material
would be dredged with a cutter-head and piped onto the beach. Then the material would be moved around by
front-end loaders to the designed fill template. Please see the Environmental Impact Statement for additional
information concerning this project.
THIS ISA RESUBMITTAL OFAPPLICATIONDUE TO PHASING OFPROJECTAND HANDLING OF
UNSUITABLE FILL MATERIAL
The information provided above has been slightly modified due to the discovery of a clay lense located in the
borrow area of the project site and the project has been phased to distribute the cost of the project over a greater
length of time. Although the majority of the project is the same, please see below for the proposed changes in
the application and project to address these concerns:
1) Please see section 6a. (page 21) entitled Project Narrative for the details of the phasing portion of this
resubmittal.
2) The applicant was required to take at least 7 more vibracores in the proposed channel alignment. These
cores were taken in November of 2008. This revealed a clay and shell layer that is not compatible
material and therefore would not be suitable for use on the beach. The unsuitable material is estimated to
be approximately 92,000 cubic yards of material. The applicant has proposed to use the compatible fill
material that is located above the unsuitable material and place it on an upland site located on a spoil
island inland near the intersection of the New River and the AIWW see Figure 6 (page 32). The
containment area is approximately 13 acres and would have a containment dike with a height of 30' as
stated on the plans. This island is state-owned with a USACE easement for dredged material deposition.
An agreement is being sought for its use. Capacity of the disposal area is 300,000 cubic yards. Typical
cross-sections of the disposal area are shown in Drawing XS-1 dated 11/24/09 and received 12/7/09. To
ensure that this material does not reach the beach the applicant is proposing to perform 5 separate cuts in
the proposed channel alignment see Figure 4 for details on size and depths of each cut. These areas are
at various depths due to the location of the clay/shell layer. The material located above these depths
would be placed on the beach and the material below them would be place on the spoil island.
10. ANTICIPATED IMPACTS
The proposed dredging would result in the removal of approximately 693 acres of shallow bottom from the inlet
area. The fill portion of the project would result in the disturbance of approximately 230 acres of beach above
NHW and would fill approximately 415 acres of shallow bottom below NHW. Approximately 12 acres of
upland would be filled within the diked disposal area.
Submitted by: S. Everhart Date: January 15, 2010 Office: Wilmington
og - ? 'l LA Ll u 2-
1CM MP4
NPUCA1811
Maier Development Permit
(last revised 12/27/06)
North Carolina DIVISION OF COASTAL MANAGEMENT
1. Primary Applicant/ Landowner Information
Business Name Project Name (if applicable)
Town Of North Topsail Beach, North Carolina North Topsail Beach Shoreline Protection Project
Applicant 1: First Name MI Last Name
Donald Martin
Applicant 2: First Name MI Last Name
N/A N/A N/A
If additional applicants, please attach an additional page(s) with names listed.
Mailing Address PO Box City State
2008 Loggerhead Court N/A North Topsail Beach NC
ZIP Country Phone No. FAX No.
28460 County: Onslow 910 - 328 -1349 ext. NA 910 - 328 -4508
Street Address (if different from above) City State ZIP
N/A N/A N/A N/A-
Email
[e-mail]
2. AgentlContractor Information
Business Name
Coastal Planning & Engineering Of North Carolina, Inc.
Agent/ Contractor 1: First Name MI Last Name
James T. Jarrett
Agent/ Contractor 2: First Name MI Last Name
N/A N/A N/A
Mailing Address PO Box City State
4038 Masonboro Loop Road N/A Wilmington NC
ZIP Phone No. 1 Phone No. 2
28409 910 - 791 - 9494 ext. N/A 910 - 392 - 0453 ext. N/A
FAX No. Contractor #
910 791 4129 Federal ID # 020623951
Street Address (if different from above) City State ZIP
N/A N/A N/A NIA -
Email
tjarrett@coastalpla nning. net
H E VE D
Coastal Planning & Engineering of North Carolina, Inc. nCM VVI MINGTON N(D
S E P 3 0 2009
3. Project Location
County (can be multiple) Street Address
The northern project limit is located within the New River Inlet State
Rd. #
Onslow and the southern limit is located near 9th Street. N/A
Subdivision Name City State Zip
N/A Town of North Topsail Beach NC 28460
Lot No.(s) (if many, attach additional page with
Phone No. list)
910 - 328 -1349 ext. N/A N/A,
a. In which NC river basin is the project located? b. Name of body of water nearest to proposed
White Oak River Basin project
New River Inlet and Atlantic Ocean
c. Is the water body identified in (b) above, natural or manmade? d. Name the closest major water body to the
®Natural []Manmade []Unknown proposed project site.
New River Inlet and Atlantic Ocean
e. Is proposed work within city limits or planning jurisdiction? f. If applicable, list the planning jurisdiction or city
®Yes ?No limit the proposed work falls within.
Town of North Topsail Beach
4. Site Description
a. Total length of shoreline on the tract (ft.) b. Size of entire tract (sq.ft.)
Approximately 58,608 linear ft; which is the total length of 141,657,120 sq ft (3,252 ac)
the North Topsail Beach Shoreline (11.1 mi)
c. Size of individual lot(s) d. Approximate elevation of tract above NHW
(normal high water) or NWL (normal water
N/A,
(If many lot sizes, please attach additional page with a list) level)
approximately 7.0 ft ®NHW or ?
NWL
e. Vegetation on tract
See attached.
f. Man-made features and uses now on tract
See attached.
g. Identify and describe the existing land uses adjacent to the proposed project site.
See attached.
h. How does local government zone the tract? i. Is the proposed project consistent with the
C-1; Conservation District, Ocean-front Side and R-1; applicable zoning?
(Attach zoning compliance certificate, if applicable)
Residential ®Yes ?No ?NA
j. Is the proposed activity part of an urban waterfront redevelopment proposal? ?Yes ®No
k. Has a professional archaeological assessment been done for the tract? If yes, attach a copy. ®Yes ?No ?
NA
If yes, by whom? Tidewater Atlantic
Research, Inc.
1. Is the proposed project located in a National Registered Historic District or does it involve a ?Yes ®No ?
National Register listed or eligible property? NA

Coastal Planning & Engineering of North Carolina, Inc. 1)CM V, lt.M 1 NGT0N, NC
2 S E P 3 0 2009
m. (i) Are there wetlands on the site? ?Yes ®No
(ii) Are there coastal wetlands on the site? ?Yes ®No
(iii) If yes to either (i) or (ii) above, has a delineation been conducted? ?Yes ?No
(Attach documentation, if available)
n. Describe existing wastewater treatment facilities.
N/A
o. Describe existing drinking water supply source.
N/A
p. Describe existing storm water management or treatment systems.
N/A
5. Activities and Impacts
a. Will the project be for commercial, public, or private use? ?Commercial
®Public/Govemment
?Private/Community
b. Give a brief description of purpose, use, and daily operations of the project when complete.
See Attached.
c. Describe the proposed construction methodology, types of construction equipment to be used during construction, the
number of each type of equipment and where it is to be stored.
See Attached.
d. List all development activities you propose.
See Attached
e. Are the proposed activities maintenance of an existing project, new work, or both? New Work
f. What is the approximate total disturbed land area resulting from the proposed project? Approximately 42
See Attached acres of upland
and approximately
758 acres of
submerged lands
?Sq.Ft or ®Acres
g. Will the proposed project encroach on any public easement, public accessway or other area ®Yes ?No ?NA
that the public has established use of?
h. Describe location and type of existing and proposed discharges to waters of the state.
See Attached.
i. Will wastewater or storrnwater be discharged into a wetland? ?Yes ®No ?NA
If yes, will this discharged water be of the same salinity as the receiving water? ?Yes ?No ®NA
j. Is there any mitigation proposed? The applicant proposes monitoring ®Yes ?No ?NA
If yes, attach a mitigation proposal.
RECEIVED
nCM WILMINGTON, NC
Coastal Planning & Engineering of North Carolina, Inc. S E r 3 0 2009
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6. Additional Information
In addition to this completed application form, (MP-1) the following items below, if applicable, must be submitted in order
for the application package to be complete. Items (a) - (t) are always applicable to any major development application.
Please consult the application instruction booklet on how to property prepare the required items below
a. A project narrative.
dated work plat (including plan view and cross-sectional drawings) drawn to scale. Please give the
An accurate
b
,
.
present status of the proposed project. Is any portion already complete? If previously authorized work, dearly indicate
on maps, plats, drawings to distinguish between work completed and proposed.
c. A site or location map that is sufficiently detailed to guide agency personnel unfamiliar with the area to the site.
A.- A copy of the deed (with state application only) or other instrument under which the applicant claims title to the affected
properties.
e. The appropriate application fee. Check or money order made payable to DENR.
A list of the names and complete addresses of the adjacent waterfront (riparian) landowners and signed return receipts
f
.
as proof that such owners have received a copy of the application and plats by certified mail. Such landowners must be
advised that they have 30 days in which to submit comments on the proposed project to the Division of Coastal
Management.
Name See Attached Phone No.
Address
Name Phone No.
Address
Name Phone No.
Address
g. A list of previous state or federal permits issued for work on the project tract. Include permit numbers, permittee, and
issuing dates.
See attached.

h. Signed consultant or agent authorization form, if applicable.
i. Wetland delineation, if necessary. None Necessary.
j. A signed AEC hazard notice for projects in oceanfront and inlet areas. (Must be signed by property owner)
A statement of compliance with the N.C. Environmental Policy Act (N.C.G.S. 113A 1-10), if necessary. If the project
k
.
involves expenditure of public funds or use of public lands, attach a statement documenting compliance with the North
Carolina Environmental Policy Act.
7. Certification and Permission to Enter on Land
.sn _n..... __l- "he d -lemment described
understand that any permit issued in response to this appnUdLIU1I Will auu" V1I;r %I- .,. •. t.,,•• •,• _- •___
in the application. The project will be subject to the conditions and restrictions contained in the permit.
I certify that I am authorized to grant, and do in fact grant permission to representatives of state and federal review
agencies to enter on the aforementioned lands in connection with evaluating information related to this permit
application and follow-up monitoring of the project.
I further certify, that the information provided in this application is truthful to the best of my knowledge.
Print Name G?/'t T rr-e
Date
Signature
Please indicate application attachments pertaininig Zproposed ject.
®DCM MP-2 Excavation and Fill Information MP-5 Bridges and Cul verts
ODCM MP-3 Upland Development
[iDCM MP4 Structures Information
For additional information associated with this project and the development of the preferred alternative,
please reference the Draft Supplemental Environmental Impact Statement (DSEIS) which can be found at
http://topsailbeach.org/index.asp?Type=B BASIC&SEC=(9CO21483-4562-4F76-9423-EO4FO6D7253E).
Coastal Planning & Engineering of North Carolina, Inc.
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GCM WILMINGTON, NC
S E P 3 0 2009
Form DCM MP-2
EXCAVATION and FILL
(Except for bridges and culverts)
Attach this form to Joint Application for CAMA Major Permit, Form DCM MP-1. Be sure to complete all other
sections of the Joint Application that relate to this proposed project. Please include all supplemental
information.
Describe below the purpose of proposed excavation and/or fill activities. All values should be given in ft.
Access
Channel
Canal Boat Boat Rock Rock Other (excluding
(NLW or Basin Ramp Groin Breakwater shoreline
NWL stabilization)
Approximately
3,375 ft (ocean bar
channel excavation
area)
Length Approximately
1,410 ft (average
length for each of
15 potential cuts in
Borrow Area)
Approximately 500
ft (ocean bar
channel excavation
area)
Width Approximately
1,350 ft (average
width for each of
15 potential cuts in
Borrow Area)
Average in ocean
bar channel = -8 ft
Avg. NGVD-29
Existing NA NA Average in
Depth Offshore Borrow
Area = -37 ft
NGVD-29
Average in ocean
bar channel = -17
Final ft NGVD-29
Project
Depth NA NA Average in
Offshore Borrow
Area = -47 ft
NGVD-29
1. EXCAVATION 0
This section not applicable
A... ..? ..[ ..-.._ _-• ••••?-••• ?• •••w.vum w vc cA-0 cv nvnl Utl1UW Nrl" of D.
NWL in cy.
2,591,800 cy
i ype of matena? to be excavated.
Sand, Ocean bar channel near New
River Inlet, mean grain size = 0.39mm,
1.5% Silt
Sand, Offshore BA Coarse, mean grain
size = 0.33mm, 1.8%
Sand, Offshore BA Mixed, mean grain
Coastal Planning & Engineering of North Carolina, Inc
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c. (i) Does the area to be excavated include coastal
wetlands/marsh (CW), submerged aquatic vegetation
(SAV), shell bottom (SB), or other wetlands (WL)? If
any boxes are checked, provide the number of square
It affected.
?CW ?SAV ?SB
?WL ®None
size = 0.21, 6.8
Clay and Shell, ocean bar channel,
disposed on upland site.
d. High-ground excavation in cy.
N/A
2. DISPOSAL OF EXCAVATED MATERIAL ®This section not applicable
a. Location of disposal area. See Project Narrative b. Dimensions of disposal area. See Project
Narrative
c. (i) Do you claim title to disposal area? d. (i) Will a disposal area be available for future
?Yes ?No ?NA maintenance?
(ii) If no, attach a letter granting permission from the ?Yes ?No ?NA
owner. (ii) If yes, where?
e. (i) Does the disposal area include any coastal
wetlands/marsh (CW), submerged aquatic vegetation
(SAV), shell bottom (SB), or other wetlands (WL)? If
any boxes are checked, provide the number of square
ft affected.
?CW ?SAV ?SB
?WL ?None
(ii) Describe the purpose of disposal in these areas:
f. (i) Does the disposal include any area in the
water?
?Yes ?No ?NA
(ii) If yes, how much water area is affected?
3. SHORELINE STABILIZATION ®This section not applicabeE
(if development is a wood groin, use MP-4 - Structures)
a. Type of shoreline stabilization:
[]Bulkhead ?Riprap []Breakwater/Sill ?
Other:
c. Average distance waterward of NHW or NWL:
e. Type of stabilization material:
b. Length:
Width:
d. Maximum distance waterward of NHW or
NWL:
f. (i) Has there been shoreline erosion during
preceding 12 months?
?Yes ?No ?NA
(ii) If yes, state amount of erosion and source
of erosion amount information.
g. Number of square ft of fill to be placed below water level. h. Type of fill material.
Bulkhead backfill Riprap
Breakwater/Sill Other
i. Source of fill material.
Coastal Planning & Engineering of North Carolina, Inc.
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4. OTHER FILL ACTIVITIES ?This section not applicable
(Excluding Shoreline Stabilization)
a. (i) Will fill material be brought to the site? ®Yes ? b. (i) Will fill material be placed in coastal
No UNA
If yes,
(ii) Amount of material to be placed in the water
approximately 2.591.800 cv of material will be
disposed of on the beach between the dune and - -
6.0 ft NAVD88
(iii) Dimensions of fill area Phases 1 and 2 =
19,120 ft by 496 ft: Phases 3 and 4 = 18.380 ft by
414 It : Phase 5 = 20.320 It by 205 ft (sum of lengths
of Phases 1 - 5 is slightly different from the 11.1 mile
total oroiect length due to rounding errors
incorporated with each Phase length)
(iv) Purpose of fill
The Town is requesting a permit to implement
non-Federal shoreline and inlet management
project that would preserve the Town's tax base,
protect its infrastructure, and maintain its tourist
oriented economy.
wetlands/marsh (CW), submerged aquatic
vegetation (SAV), shell bottom (SB), or
other wetlands (WL)? If any boxes are
checked, provide the number of square ft
affected.
?CW ?SAV ?
SB
?WL NNone
(ii) Describe the purpose of the fill in these
areas:
5. GENERAL
a. How will excavated or fill material be kept on site and b. What type of construction equipment will be
erosion controlled? used (e.g., dragline, backhoe, or hydraulic
A dike will be constructed seaward of the fill area during dredge)?
the placement of beach fill. This structure will allow Cutterhead hydraulic dredge and pipeline,
the sandy material to settle out before the water bulldozers, front-end loaders and other
reenters the Atlantic Ocean. In addtion, the prefered earth moving machines
borrow area contains material that closely matches
the existing beach and is low in silt.
C. (i) Will navigational aids be required as a result of the d. (i) Will wetlands be crossed in transporting
project? equipment to project site? ?Yes ®No
?Yes ONo ?NA ?NA
(ii) If yes, explain what type and how they will be (ii) If yes, explain steps that will be taken to
implemented. avoid or minimize environmental impacts.
Date
North Topsail Beach Shoreline Protection Project
Project Name
Coastal Planning & Engineering of North Carolina, Inc.
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SEP 3 0 2009
Town of North Topsail Beach
DCM MP-1
APPLICATION FOR MAJOR DEVELOPMENT PERMIT
NORTH TOPSAIL BEACH SHORELINE PROTECTION PROJECT
North Topsail Beach, North Carolina
SECTION 4
SITE DESCRIPTION
RECEIVED
DCM WILMINGTON, NC
SEP 3 0 2009
Coastal Planning & Engineering of North Carolina, Inc.
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4e. Vegetation on tract
Perennial grasses, such as American beach grass (Ammophila breviligulata) and sea oats
(Uniola paniculata), are the primary stabilizers along the beach and dune communities
along the oceanfront shorelines of Onslow Bay and the inlet shorelines of New River
Inlet.
Many of the dune communities along the oceanfront shoreline of North Topsail Beach
are maintained by dune erosion prevention methods. These preventative measures
include the installation of sand fences, which encourage entrapment of wind-blown sand.
Since 2000, 75,000 linear ft of sand fence has been installed along North Topsail Beach
during numerous dune restoration projects. Approximately 610,000 plants consisting of a
variety of American beach grass, sea oats, bitter panicum (Panicum amarum) and
saltmeadow cordgrass (Spartina alterniflora) have been planted by the Town of North
Topsail Beach.
4f. Man-made features and uses now on tract
The tract includes single and multifamily residential homes. Based on a 14 August 2007
survey by North Topsail Beach Coastal Area Management Act (CAMA) Local Permit
Officer (LPO), 31 residential structures located on North Topsail Beach were considered
to be imminently threatened as defined by State Standard Rule 15A NCAC 7H .0308
(NCDCM, 2007b). The basic premise of this rule is that a structure in the Ocean Hazard
Area is considered imminently threatened when its foundation is less than 20 ft from the
toe of the erosion scarp. Ten (10) additional homes have been condemned on the north
end of the island due to extensive storm damage and erosion. The potential loss of these
threatened structures would reduce the total tax base by $63 million. The beachfront is
utilized for recreational activities.
4g. Identify and describe the existing land uses adjacent to the proposed project
site.
The existing land uses adjacent to the proposed project include single and multifamily
residential, commercial businesses, and community access to the beach front.
4k. Professional Archaeological Assessment
Please see Appendix B.
RECEIVED
F)CN1 WILMINGTON, NO
3 0 2009
SEP
Coastal Planning & Engineering of North Carolina, Inc.
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DCM MP-1
APPLICATION FOR MAJOR DEVELOPMENT PERMIT
NORTH TOPSAIL BEACH SHORELINE PROTECTION PROJECT
North Topsail Beach, North Carolina
SECTION 5
ACTIVITIES AND IMPACTS
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5b. Give a brief description of purpose, use, and daily operations of the project
when complete.
In 1996, North Topsail Beach was severely impacted by Hurricanes Bertha and Fran; to a
lesser extent Hurricane Bonnie in 1998, and Hurricanes Dennis, Floyd and Irene in 1999.
North Topsail Beach suffered considerable damage as a result of the severely weakened
dune system resulting from the effects of Hurricane Bertha followed by the high storm
tides that accompanied Fran. The beach has recovered to some degree as a result of
natural processes and the Town of North Topsail Beach's efforts to rebuild the frontal
dune system. However, the homes and infrastructure located along the 11.1 mi of
oceanfront shoreline of North Topsail Beach remain extremely vulnerable and the current
erosion problem is threatening the stability of homes and infrastructure in this area.
The most pressing shoreline management issue facing the Town of North Topsail Beach
is associated with the impacts of New River Inlet on the northeast end of the Town's
shoreline. Long-term shoreline erosion at the north end of Town, and shoreline
fluctuations caused by changes in the position and alignment of the ocean bar channel of
New River Inlet have made the north end properties especially vulnerable to erosion.
Currently, 17 duplex structures located at the extreme north end of Town, which have a
total tax value of over $17 million, have become imminently threatened. Attempts have
been made by individual property owners to protect the threatened duplexes with sandbag
revetments; however, most of the sandbag revetments have failed to provide substantial
protection. Two of the imminently threatened duplexes were relocated at the expense of
the property owners. Some of the remaining duplexes have been declared uninhabitable
due to the loss of water, sewer, and electrical connections and have been demolished.
The Town of North Topsail Beach is seeking Federal and State permits to allow for the
implementation of a non-Federal shoreline and inlet management project that would
preserve the Town's tax base, protect its infrastructure, and maintain its tourist oriented
economy. The goals and objectives of the North Topsail Beach Shoreline Protection
Project are as follows:
• Stabilize the oceanfront shoreline located immediately south of New River Inlet;
• Provide immediate short-term protection to the 31 imminently threatened residential
structures over the next zero to five years;
• Provide long-term protection to Town infrastructure and approximately 1,200 homes
in the northern and central sections of the Town (Phases 1 - 4) over the next thirty
years;
• Provide an interim beach fill to mitigate shoreline erosion along the southern 3.85 mi
of the Town to maintain the shoreline position until the Federal Project is constructed;
• Reduce or mitigate for historic shoreline erosion along 11.1 mi of oceanfront
shoreline of North Topsail Beach;
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Coastal Planning & Engineering of North Carolina, Inc. DCM WILMINGTON, NC
11 S E p 3 0 2009
• Improve recreational opportunities along the Town's oceanfront shoreline;
• Acquire beach compatible material for shore protection project;
• Maintain the Town's tax base by protecting existing development and infrastructure
on the oceanfront shoreline of North Topsail Beach; and
• Balance the needs of the human environment by minimizing and avoiding negative
effects to natural resources.
The restored beach frontage would be used for recreation by local citizens and tourist,
foraging by shorebirds, and nesting by sea turtles. There would not be any form of
organized daily operation of the project area.
5c. Describe the proposed construction methodology, types of construction
equipment to be used during construction, the number of each type of equipment,
and where it is to be stored.
The Applicant's Preferred Alternative includes: 1) an inlet management plan for New
River Inlet, 2) a 14-ft NAVD88 dune plan along 7.25 mi of the North and Central
sections designed as a Storm Protection project, 3) an interim beach fill project for the
southern 3.85 mi of oceanfront shoreline designed as an erosion mitigation project, and 4)
a phased construction approach. The proposed project would stem inlet induced erosion
at the extreme north end of North Topsail Beach and provide protection against damages
due to long-term erosion and storms for Town infrastructure and houses along the
northern 7.25 mi of North Topsail Beach (14-ft NAVD88 Dune Plan). Likewise, this
option will reduce shoreline erosion along the southern 3.85 mi of North Topsail Beach's
oceanfront shoreline in the interim until the Federal Storm Protection Project is
constructed (Interim Beach Fill Project).
The results of a geomorphic analysis conducted by Dr. William Cleary of the University
of North Carolina at Wilmington (Appendix A - Final Engineering Report) suggest that
the change in the behavior of the shoreline between 1984 and 2003 on the northeast end
of North Topsail Beach and the southwest end of Onslow Beach correspond to the time
when the main channel through the ebb tide delta of New River Inlet began to shift from
a southwesterly alignment to a southeasterly alignment. The realignment of the ebb
channel was accomplished by a shift in the apex of the ebb tide delta to the northeast or
toward Onslow Beach. These changes in the configuration of the ebb tide delta modified
sediment transport patterns on North Topsail Beach and exposed the northernmost end of
the beach to direct wave attach. Prior to the shift in channel alignment and apex position,
the northern end of North Topsail Beach benefited from the protection provided by the
ebb tide delta with the section of the shoreline located between baseline stations 1115+00
and 1150+00 advancing an average of 210 ft between 1962 and 1984. Farther to the
southwest, the shoreline between baseline stations 1080+00 and 1115+00 advanced an
average of 52 ft during this period. Once the inlet channel and apex of the ebb tide delta
Coastal Planning & Engineering of North Carolina, Inc. R E;v I V E ID
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began to shift toward Onslow Beach, the entire shoreline on the north end of North
Topsail Beach between baseline stations 1080+00 and 1150+00 responded by receding at
an average rate of 5.3 ft/year between 1984 and 2003.
The results of the geomorphic analysis strongly suggest that an ocean bar channel
oriented perpendicular to the adjacent shorelines (i.e. along an azimuth of approximately
150 ) would have the effect of shifting the ebb tide delta closer to the north end of North
Topsail Beach would provide positive shoreline benefits to the adjacent oceanfront
shorelines. The inlet management plan includes repositioning the main ocean bar
channel to a more southerly alignment as recommended by the geomorphic analysis with
periodic maintenance of the preferred position and alignment. The channel would be
500-ft wide dredged to a depth of -18 ft NAVD88. It is important to note that the gorge
of the inlet or location of the deepest part of the channel between North Topsail Beach
and Onslow Beach is not being modified but rather the seaward extent of the Inlet
channel that extends across the ebb tide delta.
Phased Construction Approach
The Town of North Topsail Beach is considering constructing the initial shore protection
project in five (5) phases, to correspond with its anticipated funding stream that would be
generated from multiple sources (see Section 6c.: Figures 1, 2, and 3). The following
describes the timing sequence of the five (5) phased initial construction plan.
The first phase of initial construction (USACE Baseline Stations 1070+00 to 1160+00)
would occur between 16 November 2010 and 31 March 2011 (environmental dredging
window) and would involve the relocation of the New River Inlet channel. Phases 2, 3,
4, and 5 of initial construction would then take place every other year during the same
November to March dredging window (Table 1).
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Coastal Planning & Engineering of North Carolina, Inc.
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Table 1. Construction schedule and costs for initial construction of phases 1- 5.
Fill Re- Re- Total Cost
Phase Constr. Baseline Length Volume Nourishment Nourishment Estimates ($
Years Stations (ft) (Cy) (Phase) Volume (cy) Millions)
1 2010- 1070+00- 9,000 544,400 NA NA $5.754
11 1160+00
2 2012- 968+80- 10,120 940,700 NA NA $10.401
13 1070+00
3 2014- 785+00- 11,500 393,800 Phase 1 233,200 $8.226
15 900+00
4 2016- 900+00- 6,880 721,500 Phase 2 121,800 $8.945
17 968+80
5 2018- 581+80- 20,320 512,400 Phases 1-3 627,000 $12.930
19 785+00
The Town's shoreline protection project also includes periodic maintenance of the new
ocean bar channel at New River Inlet approximately every four (4) years, beginning in
2014, with disposal of the maintenance material along the North and Central sections.
The phased construction considers inlet maintenance events that occur during the 8 year
period of initial construction. Despite the USACE's prediction that the Federal Project
will be constructed in 2014, the phased construction approach assumes a without-
construction scenario of the Federal project in the South section by 2014.
A sand dike will be constructed on the seaward side of the fill area. The sand slurry will
then be discharged via pipeline dredge behind the dike. Excess water will be released
around the end of the dike. Finally, bulldozers will be used to construct the dune and
berm system and grade the sand across the new beach profile. Storage of the equipment
will not typically be a concern as the work will likely occur 24 hours a day.
Based on the 2005 hydrographic survey of the inlet, a total of 635,800 cy of material is
located within the preferred channel corridor. In order to avoid the clay layers, the
channel was divided into five (5) subsections with variable depths of cut based on the
elevation of the clay layer within each subsection (See Section 6c.: Figure 4). The
amount of beach compatible material located above the clay layers was estimated to be
544,400 cy with the remaining 91,400 cy consisting of clay and shell (See Section 6c.:
Figure 5). The beach compatible material would be pumped to the beach to construct the
beach fill along the northern section of the town and the incompatible material deposited
in an upland disposal site located at the juncture of the AIWW and New River Inlet (see
Section 6c: Figure 6). The composite characteristics of the beach compatible material
located above the clay laver are: mean grain size 0.39 mm, silt percent 1.53%, granular
percent 5.38%, gravel percent 3.64%, and carbonate percent 22%.
The material removed to construct the new channel would be used to construct 9,000 ft of
the beach fill south of New River Inlet (Phase 1, baseline stations 1070+00 to 1160+00).
The first maintenance event for the inlet channel would likely be in 2014-2015. This
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corresponds to the proposed year for the construction of Phase 3. The material that
would be removed from the inlet channel for maintenance would be placed along the
Phase 3 shoreline (baseline stations 785+00 to 900+00) as well Phase 1 as re-nourishment
(baseline stations 1070+00 to 1160+00).
The remaining portion of the Northern section (Phase 2, USACE baseline stations
968+80 to 1070+00) and the Central section (Phase 4, USACE baseline stations 900+00
to 968+80) would be constructed using an offshore borrow area. The offshore borrow
area would also be used to construct the beach fill in the South Section (Phase 5) that
extends from the southern town limits (baseline station 581+80) to baseline station
785+00. The offshore borrow area is located between USACE baseline stations 780+00
and 870+00 (approximately 0.4 and 1.6 mi offshore).
A combination of geophysical and biological research investigations confirmed the
location of exposed hardbottoms in the nearshore and offshore of North Topsail Beach.
The location of diver verified hardbottom and quality of sand was used to define the
boundaries of the offshore borrow area. A pipeline cutterhead dredge would be used to
remove sand from the proposed borrow area.
As discussed above, periodic dredging of the inlet channel would be required to maintain
the preferred position and alignment of the channel. The material removed during the
maintenance operations would be used to renourish the oceanfront shoreline along the
North and Central sections (Phases 1 - 4). Based on estimated shoaling rates in the new
channel, the volume of material that would be removed every four years appears to be
sufficient to maintain the beach fill project along the 7.25 mi of shoreline included in
these phases. However, if the channel maintenance material is insufficient to maintain
the beach fill, supplement nourishment material would be obtained from an offshore
borrow area.
A 14-foot NAVD dune plan is proposed for the Northern and Central sections (Phases 1-
4). It would encompass a total shoreline length of approximately 37,500 ft (USACE
baseline station 785+00 to 1160+00) including a 1,000 foot transition on the north end
adjacent to New River Inlet. The 14-foot dune plan includes an artificial dune
constructed to an elevation of +14 ft NAVD with a crest width of 25 ft fronted by a
variable width beach berm at elevation +6 ft NAVD.
The interim beach fill plan for the Southern section (Phase 5) includes approximately
20,320 ft (USACE baseline stations 581+80 to 785+00) of the Town's oceanfront
shoreline with a horizontal berm constructed to an elevation of +6 ft NAVD.
Construction of the interim fill along the Southern section would use material from the
offshore borrow area
Coastal Planning & Engineering of North Carolina, Inc.
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5d. List all development activities you propose.
The Town of North Topsail Beach is proposing the implementation of an inlet management plan
for New River Inlet and the construction of a beach fill project along 11.1 mi of the Town's
shoreline. The inlet management plan includes repositioning the main ocean bar channel to a
more southerly alignment (i.e. along an azimuth of approximately 150°) and periodic
maintenance of the preferred position and alignment approximately every four years. The
material removed from the channel during initial construction is separated into beach compatible
and non-beach compatible material. The beach compatible material (Fine sand with mean grain
size of 0.33mm) will be placed on the beach during Phase 1 between baseline stations 1070+00
and 1160+00 (approximately 544,400 cy). Non-beach compatible material removed from the
channel during initial construction (mix of clay and shell) will be disposed of on an upland
disposal site located at the junction of the Intracoastal Waterway, the New River, and Cedar
Bush Cut (approximately 91,400 cy). The material removed from the inlet during maintenance
events, assuming it is all beach compatible, would be placed along the northern and central
beachfront of North Topsail Beach. A 14-ft NAVD88 dune plan with a 6-ft NAVD88 berm
height is proposed for the Northern and Central sections (Phases 1-4). Phases 2, 4, and 5 will be
constructed with material from an offshore borrow site (See Appendix C - Final Geotech
Report). No dune plan is included in the southern section (Phase 5) of the project as it is only
designed as an interim fill to hold the line until the Federal Project is constructed.
Coastal Planning & Engineering of North Carolina, Inc.
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DCM WILMINGTON, NC
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5h. Describe location and type of existing and proposed discharges to waters of the state.
The fill locations are the oceanfront beach adjacent to the Town of North Topsail Beach and
New River Inlet. Borrow material will be removed from the proposed inlet realignment and
from a borrow area located between 0.4 and 1.6 mi offshore directly south of North Topsail
Beach Town Hall. The proposed work is associated with beach fill and maintenance of the
proposed project.
In addition to beach disposal, approximately 91,400 cy of clay and shell will be removed from
the ocean bar channel at New River Inlet during initial construction and will be disposed of on an
upland disposal site located at the junction of the AIWW and New River Inlet (See Section 6c.:
Figure 6). Dike construction and proper outfall pipe placement will be coordinated with the
contractor.
According to the North Carolina Division of Coastal Management (NCDCM), 26 permits have
been issued for sandbags since 1992 and in May 2008 exposed sandbags in North Topsail Beach
are required to be removed (J. Giles, pers. comm.).
5j. Mitigation Proposal
A mitigation and monitoring proposal is currently under development for this project (See
Appendix D - Mitigation and Monitoring Plan). Any mitigation or monitoring that may be
required for this project will be approved, as required by the SEPA process, prior to construction
of the proposed project.
Coastal Planning & Engineering of North Carolina, Inc.
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DCM MP-1
APPLICATION FOR MAJOR DEVELOPMENT PERMIT
NORTH TOPSAIL BEACH SHORELINE PROTECTION PROJECT
North Topsail Beach, North Carolina
SECTION 6
ADDITIONAL INFORMATION
Coastal Planning & Engineering of North Carolina, Inc.
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0CM W11MI GTCN, NC
S EP 3 0 2009
6a. Project narrative.
The proposed project includes: 1) an inlet management plan for New River Inlet, 2) a 14-
ft NAVD88 dune plan along 7.25 mi of the North and Central sections designed as a
Storm Protection project, 3) an interim beach fill project for the southern 3.85 oceanfront
shoreline designed as an erosion mitigation project, and 4) a phased construction
approach. Implementation of the plan would be accomplished in five (5) phases which
were described above in Section 5c. The plan is proposed to stem inlet induced erosion
at the extreme north end of North Topsail Beach and provide protection against damages
due to long-term erosion and storms for Town infrastructure and houses along the
northern 7.25 mi of North Topsail Beach (14-ft NAVD88 Dune Plan). Likewise, this
option will reduce shoreline erosion along the southern 3.85 mi of North Topsail Beach's
oceanfront shoreline in the interim until the Federal Storm Protection Project is
constructed (Interim Beach Fill Project).
Inlet Management Plan
The results of a geomorphic analysis conducted by Dr. William Cleary of the University
of North Carolina at Wilmington (Appendix A - Final Engineering Report) suggest that
the change in the behavior of the shoreline between 1984 and 2003 on the northeast end
of North Topsail Beach and the southwest end of Onslow Beach correspond to the time
when the main channel through the ebb tide delta of New. River Inlet began to shift from
a southwesterly alignment to a southeasterly alignment. The realignment of the ebb
channel was accomplished by a shift in the apex of the ebb tide delta to the northeast or
toward Onslow Beach. These changes in the configuration of the ebb tide delta modified
sediment transport patterns on North Topsail Beach and exposed the northernmost end of
the beach to direct wave attach. Prior to the shift in channel alignment and apex position,
the northern end of North Topsail Beach benefited from the protection provided by the
ebb tide delta with the section of the shoreline located between baseline stations 1115+00
and 1150+00 advancing an average of 210 ft between 1962 and 1984. Farther to the
southwest, the shoreline between baseline stations 1080+00 and 1115+00 advanced an
average of 52 ft during this period. Once the inlet channel and apex of the ebb tide delta
began to shift toward Onslow Beach, the entire shoreline on the north end of North
Topsail Beach between baseline stations 1080+00 and 1150+00 responded by receding at
an average rate of 5.3 ft/year between 1984 and 2003.
The results of the geomorphic analysis also strongly suggest that an ocean bar channel
oriented perpendicular to the adjacent shorelines (i.e. along an azimuth of approximately
150) would have the effect of shifting the ebb tide delta closer to the north end of North
Topsail Beach would provide positive shoreline benefits to the adjacent oceanfront
shorelines (See Section 6c.: Figure 7). This plan includes the implementation of an inlet
management plan for New River Inlet in addition to theconstruction of a beach fill
project along 11.1 mi of the Town's oceanfront shoreline.
The inlet management plan includes repositioning the main ocean bar channel to a more
southerly alignment as recommended by the geomorphic analysis with periodic
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maintenance of the preferred position and alignment. It is important to note that the
gorge of the inlet, or location of the deepest part of the channel between North Topsail
Beach and Onlsow Beach, is not being modified but rather the seaward extent of the Inlet
channel that extends across the ebb tide delta.
Management of New River Inlet will involve the initial construction and periodic
maintenance of a 500 ft wide x -18 ft NAVD88 deep ocean bar channel through the New
River Inlet ebb tide delta. The new ocean bar channel would begin in the existing inlet
gorge and extend along a 1550 azimuth to the -18 ft NAVD88 contour in the ocean. The
periodic maintenance and/or relocation of the ocean bar channel to its new position and
alignment is a critical element of the project with its ability to provide long-term
protection for the extreme north end of North Topsail Beach.
Accordingly, two (2) channel thresholds have been established, either one of which could
trigger the need to perform maintenance dredging in the new channel. The first channel
maintenance threshold would be dictated by shoaling of the new channel totaling 85% of
the initial dredge volume. The current estimate for initial construction is 635,800 cy with
the channel expected to shoal completely within four (4) years. As the channel shoals,
there would be a renewed tendency for it to begin to migrate away from the preferred
position and alignment, therefore, maintenance of the channel could be accomplished as a
preventative measure when shoaling totals 85% of the initial volume. The second
channel maintenance threshold would be the migration of the thalweg of the channel
outside the 500-ft wide corridor established during initial construction.
Following the release of the Draft EIS in November 2007, a review of the draft
geotechnical report by the NCDCM indicated that in order to comply with the North
Carolina technical standards for beach fill projects a minimum of ten (10) vibracores
must be taken inside of the borrow site. At the time of the Draft EIS, three (3) vibracores
were located within the footprint of the proposed channel due to the readjustment of the
channel position to avoid potential cultural resource impacts.
In November 2008, seven (7) additional vibracores were drilled in New River Inlet (see
Section 6c.: Figure 4). Upon collection and analysis of these additional vibracores, it was
discovered that discontinuous layers of clay at varying depths were present in portions of
the designed channel. Clay sediments were identified above the proposed bottom
channel depth of -18 NAVD88 (-17 ft. NGVD29) in vibracores NTVC-08-01, NTVC-08-
02, and NTVC-08-06 (Section 6c.: Figure 5). Figure 4 (see Section 6c.) depicts cut
depths which indicate the deepest depth within each cut that material will be placed on
the beach. Material below these depths down to -18 ft NAVD88 (-17.0 ft NGVD29) will
be placed in an upland disposal site.
Due to the presence of these clay layers within the designed channel and the
incompatibility of the clay on the native beach, an alternative borrow area design was
developed. As indicated in the Draft EIS and the geomorphic analysis included in
Appendix A - Final Engineering Report, a channel oriented perpendicular to the adjacent
shorelines, closer to the north end of North Topsail Beach, would provide positive
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shoreline benefits for the adjacent oceanfront shorelines. Maintenance of the designed
channel to a depth of -18.0 ft. NAVD88 (47.0 ft. NGVD29) in the preferred position and
along the preferred alignment is critical for the recovery of the extreme northern end of
the Town's shoreline. Therefore, the Town of North Topsail Beach in coordination with
Coastal Planning & Engineering of North Carolina, Inc., the Town's consultant, and the
USACE and NCDCM, determined to maintain the inlet channel design as presented in
the Draft EIS and dispose of the underlying clay material within the design template on
an upland disposal site located at the junction of the AIWW and New River Inlet (see
Section 6c.: Figure 6).
In order to establish maximum cut depths to avoid and minimize placing incompatible
material on the beach, the channel template was split into five (5) different cuts with
differing bottom of cut elevations (see Section 6c.: Figure 4). All material below these cut
depths down to a bottom of channel depth of -18.0 ft. NAVD88 (-17.0 ft. NGVD29) will
be placed in the above mentioned upland disposal site.
The composite characteristics of the inlet material located within the design cuts to be
disposed of on North Topsail Beach and located above the clay material include a mean
grain size of 0.39 mm, 1.49 phi sorting (poorly sorted), and 1.53% silt. The total volume
of the channel design cut using a side slope of 1:5 is 635,800 cy. Of this volume,
544,400 cy of material is beach compatible and 91,400 cy is incompatible material.
These volumes are based on the 2005 survey of the channel. Given the dynamic nature
of the inlet, these volumes are subject to change.
The 544,400 cy of beach compatible material removed to construct the new channel
would be used during Phase 1 to construct 9,000 ft of the beach fill south of New River
Inlet (baseline stations 1070+00 to 1160+00) (Table 1).
As discussed above, periodic dredging of the inlet channel would be required to maintain
the preferred position and alignment of the ocean bar channel. The material removed
during the maintenance operations will be disposed of along the North and Central
sections of the oceanfront shoreline throughout the 30-year life of the project (see Section
6c.: Figures 5 and 6). Based on estimated shoaling rates in the new channel, the volume
of material to be removed from the channel every four (4) years to maintain the ocean bar
channel position and protect the north end of North Topsail Beach is 627,000 cy.
Consequently, this amount of material, if deposited along the 7.25 mi of shoreline
included in the North and Central Sections (Phases 1 - 4), would provide a sufficient
amount of material to maintain the beach design for storm protection and erosion
mitigation.
The 14-ft NAVD88 dune plan encompasses a total shoreline length of 7.25 mi ft
(USACE baseline station 785+00 to 1160+00) and includes a 1,000 ft transition on the
north end adjacent to New River Inlet (see Section 6c.: Figures 8 - 10). The 14-ft dune
plan includes an artificial dune constructed to an elevation of +14 ft NAVD with a crest
width of 25 ft fronted by a variable width beach berm at elevation +6 ft NAVD. Material
for the initial construction of the 14-ft dune plan in the North and Central sections
?= --Cf.
Coastal Planning & Engineering of North Carolina, Inc. , vi WILMINGTON, E 1
23 NC
j F P 3 0 2009
(Phases 1 - 4) will be derived from a combination of the offshore borrow area and
realigned inlet channel. The volume needed to construct the 14-ft NAVD feature will be
adjusted based on profile surveys taken immediately prior to construction and field
directions provided by the construction supervisor. The intent of the beach fill design is
to provide a 14-ft NAVD dune along the entire length of the beach in the North and
Central sections (Phases 1- 4).
The interim beach fill plan for the South section includes 20,320 ft (USACE baseline
stations 581+80 to 785+00) of the Town's oceanfront shoreline with a horizontal berm
constructed to an elevation of +6 ft NAVD. Construction of the interim fill along the
South section would use material from the offshore borrow area (see Section 6c.: Figure
11). The USACE's present schedule for construction of a Federal storm damage
reduction project for the Surf City/North Topsail Beach federal project is November 2014
(G. McIntosh, pers. comm.), which may render this portion of the project unnecessary.
Phase 2 of the project (USACE baseline stations 968+80 to 1070+00) will be constructed
using the offshore borrow source. Within Phase 2 between USACE baseline stations
1020+00 and 1070+00 coarse material from the offshore borrow source will be used to
avoid impacts to nearshore hardbottoms. Phase 3 of the project (USACE baseline
stations 785+00 to 900+00) will be constructed using material from the maintenance of
the Inlet as construction is scheduled to occur four years after initial inlet construction.
At the same time Phase 1 will be re-nourished with the material from the inlet
maintenance that exceeds that needed to construct Phase 3. Phase 4 and 5 of the project
(USACE baseline stations 900+00 to 968+80 and 581+80 to 785+00, respectively) will
be constructed using material from the offshore borrow source.
In its efforts to locate an offshore sand source for the North Topsail Beach Shoreline
Protection Project, CPE-NC conducted an extensive three-phased sand search of the
shoreface off North Topsail Beach. The first phase of the sand search involved
compiling and analyzing historical data that exist for the North Topsail Beach shoreface.
These data were mostly compiled from two datasets. The first data set was developed by
Dr. William J. Cleary and the UNCW Marine Geology Lab and included sidescan
coverage of the shoreface from the southwest end of Onslow Beach southwest to Surf
City from approximately 2.6 - 4.2 mi offshore, including all of North Topsail Beach and
3.0 mi of Surf City. Data from over 100 ground truthing dive sites where bottom
substrate, depth of surface sand, and presence of hardbottom were recorded. The UNCW
data set also include approximately 35 vibracores from offshore North Topsail Beach and
the north end of Surf City. The second data set was developed by the USACE during its
feasibility study for the North Topsail Beach/Surf City Shore Protection Project. These
data included approximately 360 line mi of seismic data, which provided reconnaissance
level coverage of the shoreface from 0.8 - 5.3 mi offshore along the entire length of
North Topsail Beach and Surf City. In addition the USACE collected over 369
vibracores within this same area in an effort to locate sand for the Federal project.
The second phases of the sand search conducted by CPE-NC involved reconnaissance
surveys Oetprobe and geophysical) to ground truth this extensive historical data. The
RECEIVED
Coastal Planning & Engineering of North Carolina, Inc. DCM WIL 4INGTON, NC
24
E P 3 0 2009
third phase of the sand search included detailed geophysical and vibracore surveys to
accurately map the sand source to be used for the project. In all the three-phased sand
search encompassed approximately 72 square mi (46,080 acres) of the shoreface from
New River Inlet southwest including all of North Topsail Beach and the northern 3.0 mi
of Surf City, from the surf zone out to approximately 5.3 mi offshore.
The offshore borrow area is located between USACE baseline stations 780+00 and
870+00 (approximately 0.4 and 1.6 mi offshore) (see Section 6c.: Figures 2 and 3). A
combination of geotechnical and biological research investigations confirmed the
location of exposed hardbottoms in the nearshore and offshore of North Topsail Beach.
The location of diver verified hardbottom and quality of sand was used to define the
boundaries of the offshore borrow area. A detailed evaluation of the offshore borrow
area is available in Appendix C (Final Geotech Report).
Sand samples collected from sediment layers within the borrow area were analyzed for
composite grain size characteristics (mean grain size, sorting coefficient, silt content, and
shell content). Analysis of the sediment samples conform to the State's technical
standards. Upon locating a secondary incised channel within the relic depression that
comprises the offshore borrow area that contained relatively coarser sand than the rest of
the borrow area, and based on the need for coarse material to employ the point of
intercept concept to avoid impacts to nearshore hardbottoms, the offshore borrow area
was divided into two sections, 1) a 459-acre area with finer grain size (composite mean
grain size of 0.21 mm) containing approximately 6.19 million cy of sand, and 2) a 23-
acre area with coarser material (composite mean grain size of 0.33 mm) containing
approximately 357,000 cy of sand. The total volume available from the offshore Borrow
Area is 6.55 million cy, including both fine and coarse fill. The design of the offshore
borrow area complies with the February 2008 North Carolina State Sediment Criteria
Standards.
Details of the sediment analyses are provided in Appendix C - Final Geotechnical
Report. Approximately 3.23 million cy is needed to nourish 11.1 mi of oceanfront
shoreline under the initial project. The offshore borrow area is broken into 16 different
cuts (areas with different depths to cut to) shown in Figures 12 and 13 (see Section 6c).
Table 2 shows the cut depths, the area, and the acreage for each of the 16 cuts. The
coarse material dredged from New River Inlet and the offshore borrow area will be
placed in the north and central sections in the vicinity of hardbottom outcroppings located
approximately 900 to 1,170 ft offshore of the February-March 2002 mean high water line
(USACE baseline stations 855+00 to 890+00 and 1030+00 to 1075+00). Fill placement
of the coarse material will extend 1000 ft south and 500 ft north beyond the limits of the
shoreline that coincides with the hardbottom edge to account for possible longshore drift
effects (between USACE baseline stations 830+00 to 900+00 and 1020+00 to 1160+00).
This design measure is expected to result in the point-of-intercept (depth of closure)
occurring between 450 and 600 ft landward of the nearshore hardbottom edge. Specific
detailed information regarding how this design measure will be monitored during
construction of the project is provided in Appendix D: Mitigation and Monitoring Plan.
RECEIVED
Coastal Planning & Engineering of North Carolina, Inc. i0 1 WILMINGTON, NC
25
SEP 3 0 2009
Table 2. Type of material, cut depth, area, and acreage of
each of the 16 cuts that comprise the offshore borrow area.
Refer to Figure 12 below in sections 6b and 6c.

Cut # TYPE OF
MATERIAL CUT
DEPTH AREA
T2
ACREAGE
1 Mix -42.0 1117420 25.7
2 Mix -53.5 173515 4
3 Mix -42.0 1200908 27.6
4 Coarse -50.0 657519 15.1
6 Coarse -40.0 329353 7.6
5 Mix -40.0 619688 14.2
7 Mix -46.0 2130910 48.9
8 Mix -43.0 1425890 32.7
9 Mix -45.0 577299 13.3
10 Mix -49.0 768367 17.6
11 Mix -45.0 4999701 114.8
12 Mix -54.0 575791 13.2
13 Mix -44.0 1501838 34.5
14 Mix -47.5 2235835 51.3
15 Mix -47.0 1689119 38.8
16 Mix -46.0 976030 22.4
TOTAL: 20,979,183 481.6
Coastal Planning & Engineering of North Carolina, Inc.
26
i s-AVER
!?, -A! WILMINGTON, NC
SE P 3 p 2009

b and 6c. Work Plats and Location

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Figure 3. Alternative 3, Applicant's Preferred Alternative - Southern Section
Coastal Planning & Engineering of North Carolina, Inc. 0CM WILMINGTON, NC
29
SEP 3 0 2009
Coastal Planning & Engineering of North Carolina, Inc. 4y1 ?Py ?? 1/i64?i l?l
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)EP 3 0 2009
Figure 4. Map depicting locations of New River Inlet vibracores and channel design. lvote
the proposed ocean bar channel ties into the existing position of the Inlet gorge.
NTVC-08-01 (21- 4' )
NTVC-08-02 (4' - 6')
4.0'
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deposits of incompatible clay material. Note depths correspond to the top of core being 0.0
and are not referenced to a vertical datum.
Coastal Planning & Engineering of North Carolina, Inc. ',All' •Mj G ; 1\J, NC
31
E P 3 o 2009
2.0' 3.0'
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Figure 7. Schematic of Ebb Tide Delta Reconfiguration in Response to Proposed
Modification of Ocean Bar Channel (USACE, Oct 03 Photo).
Coastal Planning & Engineering of North Carolina, Inc.
33
RECEIVED
0CM WILMINGTON, NC
S E P 3 0 2009

A. arUl {. V• Lru?.ll llll Ylrsaa vvur. r. ....... a...? ???-?-- ^---------? - ---- o
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R'CEIVED
Coastal Planning & Engineering of North Carolina, Inc. [)CM WILMINGT(ON, NC
34
CSEP 3 0 2009
MATCHLINE - FIGURE 76A
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Appendix A - Final Engineering Report).
RECEIVED
Coastal Planning & Engineering of North Carolina, Inc. DCM WILMINGTON, NC
35
3 ? P 2009
Figure 10. Beach fill plan - Central and Northern Sections, Phases 1- 4 (Figure 76C from
Appendix A - Final Engineering Report).
Coastal Planning & Engineering of North Carolina, Inc. RECEIVED
36 DCM WILMINGTON, NC
SEp 3 0 2009

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Final Engineering Report).
Coastal Planning & Engineering of North Carolina, Inc. RECEIVED
37 DCM WILMINGTON, NC
S E P 3 0 2009
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Refer to Table 2 in section 6a above.
a" 21---CEI V ED
IIA."11-MiNGTON, NC
Coastal Planning & Engineering of North Carolina, Inc.
; EP 3 o 2009
38
NORTH TOPSAIL SHORELINE CUT TO CUT TO
PROTECTION PROJECT -45.0 -49.0
OC TOBER 22, 2008 NTVC-06 0_? NTVC-06-10
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Figure 13. Plan view and cross section view of the offshore borrow area.
Coastal Planning & Engineering of North Carolina, Inc. E Cco- IV ED
39 DCM WILMINGTON, NC
S E P 3 0 2009
Coastal Planning & Engineering of North Carolina, Inc.
40
ED
GCM WILMINGTON, NC
S t p 3 0 2009
Figure 14. Town of North Topsail Beach with baseline stations, and approximate CBRS
boundaries.
Northern Section 14-ft Dune Plan - Typical Construction Profile
(Station 1030+00)
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Figure 15. Typical construction profile, Northern Section (Phases 1 and 2) 14-foot Dune
Plan (Station 1030+00).
Central Section 14-ft Dune Plan - Typical Construction Profile
(Station 850+00)
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Coastal Planning & Engineering of North Carolina, Inc
41
20 '
Front of Structure Dune Crest is Approximately 25 ft
15
5 l Construction Bern is Approximately 229
RECEIVED
DCM WILMINGTON, NC
5EP 3 0 2009
Figure 16. Typical construction profile, Central Section (Phases 3 and 4) 14-foot Dune Plan
(StatinnRS0+0fl1_
Southern Section Berm Plan - Typical Construction Profile
(Station 650+00)
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Figure 18. Navigation channels in the vicinity of New River Inlet.
Coastal Planning & Engineering of North Carolina, Inc.
42
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bathymetry and the proposed post-construction design.
RECEIVED
Coastal Planning & Engineering of North Carolina, Inc. )(-,M 0,0 M1NGTON, NC
43 S H p 3 © 2009
6d. A copy of the deed (with state application only) or other instrument under
which the applicant claims title to the affected properties.
The applicant, Town of North Topsail Beach, is currently working to procure all
necessary easements and will have these in place before any work begins.
6f. Adjacent Riparian Property Owners
South End
Mitchell L Patterson and Others
1253 Deep River Road
Sanford, North Carolina 27330
Darryl C and Sally L Goebel
118 Windfall Court
Cary, North Carolina 27511
North End
Gene and Michelle Graziosi
1075 Davenport Place
Winterville, NC 28590
George C. and Diann L. Vann
1746 Red Oak Lane
Waldorf, MD 20601
1,,C WILMING ON, NC
Coastal Planning & Engineering of North Carolina, Inc. 5 EP 3 p 2009
44
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