HomeMy WebLinkAbout20061005 Ver 1_Public Notice_20050803T _ -_,,
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US Army Corps PUBLIC NOTICE
Of Engineers
Wilmington District
Issue Date: July 27, 2005
Comment Deadline: August 26, 2005
Corps Action ID #: 200500935
All interested parties are hereby advised that the Wilmington District, Corps of Engineers
(Corps) has received an application for work within jurisdictional waters of the United
States. Specific plans and location information are described below and shown on the
attached plans. This Public Notice and all attached plans are also available on the
Wilmington District Web Site at www.saw.usace.army.mil/wetlands
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Applicant: Town of Holden Beach .''`~' ~ ~ ~ ' ~ ~' ; t
110 Rothchild Street
Holden Beach, North Carolina 28462 ~?' ~~
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AGENT: Applied Technology and Management, Inc. ~', i;ra
260 West Coleman Boulevard, Suite A
Mount Pleasant, North Carolina 29464
Authority
The Corps will evaluate this application and a decide whether to issue, conditionally
issue, or deny the proposed work pursuant to applicable procedures of Section 404 of the
Clean Water Act and Section 10 of the Rivers and Harbors Act of 1899.
Location
The project site is located at two areas adjacent to the Atlantic Ocean, at Holden Beach,
Brunswick County, North Carolina. The Eastern Reach Section will be 5,800 feet long
and located near Rothschild Street going east just past the Blockade Runner. The
Western Reach Section will be 7,400 feet long and be located near Sailfish Drive. See
attached plans and drawings for specifics.
Existing Site Conditions
Disposal Site Description:
Holden Beach is a barrier island comprised mostly of unconsolidated sands along the
beach. Natural dunes are present along most of the shoreline, with the exception of some
regions near Lockwoods Folly Inlet where dunes have been eroded or severely scarped.
The dunes are small to moderate in size and are well vegetated. The Town has a sand-
fencing program, which has succeeded in areas with larger berms and available wind-
blown sediments.
The Eastern Reach has the highest erosion rates (historically exceeding 5 ft/yr) of the
island which are primarily caused by tidal currents, wave focusing, and ebb-flood shoals
from the adjacent Lockwoods Folly Inlet. The dry high-tide beach width varies from
approximately 0 ft to 20 ft within this reach and some segments of the berm exhibit
escarpments between ~0.5 ft to 1 ft high. In some cases, artificial dunes have been built
to replenish previous natural dunes eroded or severely scarped. The existing natural
dunes on this beach are small, well vegetated with sea grass, and are fronted by sand
fencing with limited sources of aeolian sediments (due to the small berm widths).
Because of the limited berm widths and small dunes, homes along this reach are highly
vulnerable to erosion and storm damage. In addition, because of the small berm widths,
there is limited dry high tide beach areas for recreation and sea turtle nesting habitats.
Erosion rates within the Western Reach are moderate compared with the inlet ends of the
island (~2-4 ft/yr). The Western Reach has berm widths from ~0 ft to 40 ft. There are
several dune ridges along the Western Reach, which are well vegetated. The most
seaward toe of dune is threatened by erosion caused by wave runup during high tide
events. Sand fencing along this reach is well buried, evidence of historically greater
berm widths along this reach relative to the Eastern Reach. However, with the near
absence of a dry high tide beach today, some losses of these most seaward dunes and
sand fences might occur.
Borrow Site Description:
The proposed borrow site for this project is a parcel of land located near the intersection
of Turkey Trap Road and Stanbury Road (referred to as the Kirby Walter Borrow Site),
approximately 3.6 miles from the beach. The majority of the 38-acre site is medium to
densely covered with trees and other vegetation. The property is mapped as Leon fine
sand (Lo), Mandarin fine sand (Ma), Muckalee loam (Mk), and Kureb fine sandy loam 0-
2% slopes (KrB) based on the USDA Soil Survey of Brunswick County, North Carolina.
The wetland areas located on the property include several small isolated depressions and
a headwater slough that drains to the north off the property. The upland areas located on
the property are best described as xeric sandhill scrub. The wetlands at the borrow site
have been delineated and the wetland line reviewed and approved by the Corps. There is
a representation of this delineation with a 50 feet buffer included in the attachments. The
Corps will sign a surveyed plat as soon as it is provided and approved.
Applicant's Stated Purpose
The town of Holden Beach intends to nourish their island's shoreline to offset long term
erosion, protect upland properties from storm damage, provide environmental restoration,
and create recreational beach area along two designated reaches totaling about 2.5 miles.
The proposed nourishment will be a truck-haul project from an upland borrow site.
2
Approximately 500,000 cubic yards (cy) of beach quality sediment will be placed
between STA 38+00 and STA 96+00, referred to as the Eastern Reach, and between STA
245+00 and STA 319+00, referred to as the Western Reach.
Project Description
The proposed beach nourishment project will be constructed over atwo-year period.
During the first year, fill will be placed between STA 38+00 and STA 70+00 within the
Eastern Reach and STA 245+00 and STA 290+00 within the Western Reach. The
following year, the town will place sediment between STA 70+00 and STA 96+00 within
the Eastern Reach and STA 290+00 and STA 319+00 within the Western Reach. The
Eastern Reach consists of 5,800 feet and the Western Reach consists of 7,400 feet of
shoreline.
The proposed borrow site for this project is a sediment source located near the
intersection of Turkey Trap Road and Stanbury Road (referred to as the Kirby Walter
borrow site), approximately 3.6 miles from the beach. The majority of the 38-acre site is
medium to densely covered with trees and other vegetation. In areas of vegetative cover,
surficial layers containing organic material, sticks, roots and other debris which will be
segregated out and not used for beach nourishment. Only native compatible beach
quality sediment will be placed on the beach. In order to avoid impacts to wetland areas
no excavation will be performed in highground within 50 feet from the approved wetland
line. The Town of Holden Beach has initiated the process of obtaining a mining permit
for the proposed borrow site from the North Carolina Division of Land Management.
Once obtained the mining permit will be submitted as a supplemental piece of this permit
application.
Once the sediment is placed on the beach, it will be graded utilizing conventional earth
moving equipment. Equipment will enter the beach through the main public beach access
located at 801 Ocean Blvd.. West (approximately STA 262+00). Work on the shorefront
will be a continuous operation 24 hours per day, 7 days per week. Based on the haul
distance between the borrow area and the beach front, it is anticipated that approximately
170 16 CY truckloads of sediment will be conveyed to the beach daily, or 2,720 cy/day.
It will require approximately 120 days of construction during the first year and
approximately 90 days of construction during the second year to complete the proposed
nourishment.
Beach Fill Design
The project design is intended to offset long-term erosion, protect upland properties from
storm damage, provide environmental restoration, and create recreational beach area. Fill
will be placed approximately between the seaward most +8 ft elevation and the -4.8 ft
elevation referenced to the National Geodetic Vertical Datum of 1929 (NGVD29). The
selected design includes an approximately 150 ft to 190 ft wide berm at +8 ft NGVD29
and an approximate seaward slope of 1V:lOH from berm crest to the fill toe. The fill toe
is designed to be located within 3 vertical feet of the -1.8 ft contour, approximately Mean
Low Water (MLW). Between 35 cy and 45 cy of sediment will be placed per linear ft
within the reaches. Actual constructed slopes and berm extensions will vary depending
on construction methods. After equilibration of the construction profile, this project will
increase beach widths approximately 30 ft within the E_ astern Reach and approximately
40 ft within the Western Reach.
Holden Beach Past Project History
There have been two beach nourishment projects on Holden Beach since 2000: the
Wilmington Harbor Deepening (Section 933) project, and a portion of the Town's Phase I
Beach Nourishment Project. Both projects were authorized by the USACE and N.C.
Division of Coastal Management. In addition, the USACE has placed maintenance
dredging material from the Atlantic Intracoastal Waterway (AIWW) along the eastern
portion of Holden Beach.
Wilmington Harbor Deepening (Section 933) project
Approximately 525,000 cy of beach compatible sediment, dredged in association with the
deepening of Wilmington Harbor/Cape Fear River (Corps Section 933 Beach Fill project
-Contract DACW54-O1-C-0012), was placed on the eastern half of Holden Beach
between STA 87+00 and STA 192+00 from December 8, 2001 to February 20, 2002.
This project included a 45-foot berm width at 7 ft NGVD29 and total fill volumes of not
more than 50 cy/ft. The fill was placed in the nearshore region of the beach but only
seaward of the pre-project MHW line, which left a variable gap between the dune scarp
and the placed fill. The Town of Holden Beach filled portions of this gap through the
placement of additional sediments from an upland source during the Town's initial
portion of their Phase I Beach Nourishment Project.
Maintenance Dredging of the AIWW
As part of the USACE maintenance dredging of the AIWW, approximately 32,000 cubic
yards of beach compatible material was placed on the eastern end of Holden Beach
(between Stations 20+00 and 30+00) during March and April of 2002.
Town of Holden Beach -Phase I
Fill was placed to help maximize the benefits of the 933 Project, by extending the
alongshore fill placement limits, filling the profile `gap' between the dune scarp and the
placed fill, and increasing total sediment volumes along the island. During the initial
portion of the Town's Phase I project, approximately 141,800 cubic yards of material was
placed between March 7 and April 30, 2002 according to the distribution shown in Table
1.
4
Table 1. Placement Details -Town of Holden Beach Phase I Beach Nourishment Pro~ect
Location Baseline Stations Pay Volume
Quantit (c) Shoreline
Len th (ft)
East Extension 87+00 to 66+00 67,763 2,100
90+00 to 87+00 255 300
"Gap" Fill
933 f
ll)
ti
S 146+00 to 132+50 1,361 1,350
i
on
(
ec 192+00 to 175+28 6,043 1,672
West Extension 192+00 to 217+00 66,352 2,500
During the initial portion of Phase I, sediment was truck-hauled from the Oyster Harbor
upland site directly to the beach to complete the beach and initial gap fill areas.
Additionally, sediment from the Seascape upland source was stockpiled in the USACE's
disposal site at the corner of Brunswick Ave and Boyd Street for eventual placement in
the remaining gap fill areas during winter 2002/2003 (gap-fill portion of Phase I).
The gap fill portion of the Town's Phase I Project placed approximately 30,000 cubic
yards of sediment from the Boyd Street disposal area into the gaps not filled during the
spring 2002 Town project. Gaps were filled between Station 175+00 and 90+00 during
the winter of 2002/2003.
During the winter of 2003/2004, part 2 of the Town's Phase 1 project was completed.
This effort included the placement of69,175 cy of sediment between stations 46+00 and
68+00, and 53,490 cy between stations 215+00 and 238+00. The material was truck
hauled from the Smith Borrow Area, located within the Lakes at Lockwood development,
between December 10, 2003 and April 1, 2004.
Other Required Authorizations
This notice and all applicable application materials are being forwarded to the appropriate
State agencies for review. The Corps will generally not make a final permit decision
until the North Carolina Division of Water Quality (NCDWQ) issues, denies, or waives
State certification required by Section 401 of the Clean Water Act (PL 92-500). The
receipt of the application and this public notice in the NCDWQ Central Office in Raleigh
serves as application to the NCDWQ for certification. A waiver will be deemed to occur
if the NCDWQ fails to act on this request for certification within sixty days of the date of
the receipt of this notice in the NCDWQ Central Office. Additional information
regarding the Clean Water Act certification may be reviewed at the NCDWQ Central
Office, 401 Oversight and Express Permits Unit, 2321 Crabtree Boulevard, Raleigh,
North Carolina 27604-2260. All persons desiring to make comments regarding the
application for certification under Section 401 of the Clean Water Act should do so in
writing delivered to the North Carolina Division of Water Quality (NCDWQ), 1650 Mail
Service Center, Raleigh, North Carolina 27699-1650 Attention: Mr. John Hennessy (NC
5
Department of Transportation projects) or Ms Cyndi Karoly (all other projects) by
August 19, 2005.
The applicant has certified that the proposed work complies with and will be conducted
in a manner that is consistent with the approved North Carolina Coastal Zone
Management Program. Pursuant to 33 CFR 325.2 (b)(2) the Corps is, by this notice,
forwarding this certification to the North Carolina Division of Coastal Management
(NCDCM) and requesting its concurrence or objection. Generally, the Corps will not
issue a Department of the Army (DA) permit until the NCDCM notifies the Corps that it
concurs with the applicant's consistency certification.
Essential Fish Habitat
This notice initiates the Essential Fish Habitat (EFH) consultation requirements of the
Magnuson-Stevens Fishery Conservation and Management Act. The Corps' initial
determination is that the proposed project may adversely impact EFH or associated
fisheries managed by the South Atlantic or Mid Atlantic Fishery Management Councils
or the National Marine Fisheries Service. These impacts to EFH include destruction of
habitat at the fill site, siltation plums, erosion and sedimentation issues, time frame work
is performed (fish moratoriums) and water quality issues.
Cultural Resources
The Corps has consulted the latest published version of the National Register of Historic
Places and is not aware that any registered properties, or properties listed as being
eligible for inclusion therein are located within the project area or will be affected by the
proposed work. Presently, unknown archeological, scientific, prehistoric, or historical
data may be located within the project area and/or could be affected by the proposed
work.
Endangered Species
The Corps has reviewed the project area, examined all information provided by the
applicant and consulted the latest North Carolina Natural Heritage Database. Based on
available information, the Corps has determined there may be species listed as threatened
or endangered or their critical habitat formally designated pursuant to the Endangered
Species Act of 1973 (ESA) within the project area. A final determination on the effects
of the proposed project will be made upon additional review of the project and
completion of any necessary biological assessment and/or consultation with the U.S. Fish
and Wildlife Service and/or National Marine Fisheries Service.
Evaluation
The decision whether to issue a permit will be based on an evaluation of the probable
impacts, including cumulative impacts, of the proposed activity on the public interest.
That decision will reflect the national concern for both protection and utilization of
6
important resources. The benefit- which reasonably may be expected to accrue from the
proposal must be balanced against its reasonably foreseeable detriments. All factors
which may be relevant to the proposal will be considered including the cumulative effects
thereof; among those are conservation, economics, aesthetics, general environmental
concerns, wetlands, historic properties, fish and wildlife values, flood hazards, flood plain
values (in accordance with Executive Order 11988), land use, navigation, shoreline
erosion and accretion, recreation, water supply and conservation, water quality, energy
needs, safety, food and fiber production, mineral needs, considerations of property
ownership, and, in general, the needs and welfare of the people. For activities involving
the discharge of dredged or fill materials in waters of the United States, the evaluation of
the impact of the activity on the public interest will include application of the
Environmental Protection Agency's 404(b)(l) guidelines.
Commenting Information
The Corps is soliciting comments from the public; Federal, State and local agencies and
officials; Indian Tribes and other interested parties in order to consider and evaluate the
impacts of this proposed activity. Any comments received will be considered by the
Corps to determine whether to issue, modify, condition or deny a permit for this proposal.
To make this decision, comments are used to assess impacts on endangered species,
historic properties, water quality, general environmental effects and the other public
interest factors listed above. Comments are used in the preparation of an Environmental
Assessment (EA) and/or an Environmental Impact Statement (EIS) pursuant to the
National Environmental Policy Act (NEPA). Comments are also used to determine the
need for a public hearing and to determine the overall public interest of the proposed
activity.
Any person may request, in writing, within the comment period specified in this notice,
that a public hearing be held to consider the application. Requests for public hearings
shall state, with particularity, the reasons for holding a public hearing. Requests for a
public hearing shall be granted, unless the District Engineer determines that the issues
raised are insubstantial or there is otherwise no valid interest to be served by a hearing.
Written comments pertinent to the proposed work, as outlined above, will be received
by the Corps of Engineers, Wilmington District, until Spm, August 26, 2005. Comments
should be submitted to Henry Wicker, Project Manager for this project.
7
04881CHBOlo.dwg 6/23/2005
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APPLICATION BY: TOWN OF LOCATION MAP PROPOSED: HOLDEN BEACH NOURISHMENT
HOLDEN BEACH AT: HOLDEN BEACH
VERTICAL DATUM: NGYD 29
HORIZONTAL DATUM: NC GRID NAD 83 TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA
110 Rothschild Street
Holden Beach, NC 28462 '""m"~"~°~"`°
DATE: 06/23/05 SCALE: NTS SHEET 1 OF 14
04881CHB0ta.dwg 6/23/2005
APPLICATION BY: TOWN OF PROPOSED PROJECT PROPOSED: HOLDEN BEACH NOURISHMENT
HOLDEN BEACH SHEET INDEX AT: HOLDEN BEACH
VERTICAL DATUM: NGYD 29
HORIZONTAL DATUM: NC GRID NAD 83 TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA
,m.o.....~.
110 Rothschild Street
Holden Beach, NC 28462
DATE: 06/23/05 SCALE: 1 "=4.000 SHEET 2 OF 14 ~ ~~.
04881CHBOla_dwg 6/23/2005
APPLICATION BY: TOWN OF PLAN VIEW EAST REACH PROPOSED: HOU)EN BEACH NOURISHMENT
HOU)EN BEACH STA. 38+00-STA. SS-~OO AT: HOU)EN BEACH
VERTICAL DATUM: NGVD 29.
HORIZONTAL DATUM: NC GRID NAD 83 TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA
110 Rothschild Street
Holden Beach, NC 28462 w~ "
DATE: 06/23/05 SCALE: 1 = 200 SHEET 3 OF 14
04881CHBOto.dwg 6/23/2005
APPLICATION BY: TOWN OF PLAN VIEW EAST REACH PROPOSED: HOLDEN BEACH NOURISHMENT
HOLDEN BEACH STA. 55+00-STA. 7~ -FOO AT: HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83 TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK . ~ r
BRUNSWICK COUNTY STATE: NORTH CAROLINA i ~ i~.rl.
110 Rothschild Street ~~~~~~,,,, ~~11~~~.jjjj....
DATE: 06/23/05 SCALE: 1"= 200' Holden Beach, NC 28462 ^~^~~
SHEET 4 OF 14 p~
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APPLICATION BY: TOWN OF PLAN VIEW EAST REACH PROPOSED: HOLDEN BEACH NOURISHMENT
HOLDEN BEACH STA. 71 +00-STA. 87+00 AT: HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83 TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA J~
110 Rothschild Street
sN9fineYillr6~Y11tA
DATE: 06/23/05 SCALE: 1'= 200' Holden Beach, NC 28462 SHEET 5 OF 14
04881CHBOla.dwg 6/23/2005
APPLICATION BY: TOWN OF
HOLDEN BEACH
VERTICAL DATUM: NGYD 29
HORIZONTAL DATUM: NC GRID NAD 83
DATE: 06/23/05 SCALE: 1 °= 200'
PLAN VIEW EAST REACH
STA. 87+00-STA. 96+00
TOWN OF HOLDEN BEACH
BRUNSWICK COUNTY
110 Rothschild Street
Holden Beach, NC 28462
PROPOSED: HOLDEN BEACH NOURISHMENT
AT: HOLDEN BEACH
COUNTY OF: BRUNSWICK
STATE: NORTH CAROLINA
SHEET 6 OF 14
04881CHB0la_dwg 6/23/2005
APPLICATION BY: -TOWN OF
HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83
DATE: 06/23/05 SCALE: 1 "= 200'
PLAN VIEW WEST REACH PROPOSED: HOU)EN BEACH NOURISHMENT
STA. 245+00-STA. 262+00 AT: HOLDEN BEACH
TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA
110 Rothschild Street
Holden Beach, NC 28462 '°`°`m°"""°~"
SHEET 7 OF 14 "`"E'""""`
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04881CHB01a.dwg 6/23/2005
APPLICATION BY: TOWN OF
HOLDEN BEACH
VERTICAL DATUM: NGYD 29
HORIZONTAL DATUM: NC GRID NAD 83
DATE: 06/23/05 SCALE: 1"= 200'
PLAN VIEW WEST REACH PROPOSED: HOLDEN BEACH NOURISHMENT
STA. 262+~~-STA. 27H•OO AT: HOLDEN BEACH
TOWN OF HOLDEN BEACH
BRUNSWICK COUNTY
110 Rothschild Street
Holden Beach, NC 28462
COUNTY OF: BRUNSWICK
STATE: NORTH CAROLINA
SHEET 8 OF 14
U4881CHB01a.dwq 6/23/2005
APPLICATION BY: TOWN OF
HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83
DATE: 06/23/05 SCALE: 1°= 200'
PLAN VIEW WEST REACH PROPOSED: .HOLDEN BEACH NOURISHMENT
STA. 278+00-STA. 294+00 AT: HOLDEN BEACH
TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA
110 Rothschild Street
Holden Beach, NC 28462 ~ ~~~
SHEET 9 OF 14 .q..o.
(14RR1CHR01a_dw^ 6/23/2005
APPLICATION BY: TOWN OF
HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83
DATE: 06/23/05 SCALE: 1°= 200'
PLAN VIEW WEST REACH PROPOSED: HOLDEN BEACH NOURISHMENT
STA. 294+00-STA. 310+00 AT: HOLDEN BEACH
TOWN OF HOLDEN BEACH couNTY oF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA
110 Rothschild Street _
b.,~,
Holden Beach, NC 28462 SHEET 10 OF 14 ~ ~«`
04881CHB01o.dwg 6/23/2005
APPLICATION BY: TOWN OF.
HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83
DATE: 06/23/05 SCALE: 1"= 200'
PLAN VIEW WEST REACH PROPOSED: HOLDEN BEACH NOURISHMENT
STA. 310+00-STA. 319+00 AT: HOLDEN BEACH
TOWN OF HOLDEN BEACH
BRUNSWICK COUNTY
110 Rothschild Street
Holden Beach, NC 28462
COUNTY OF: BRUNSWICK
STATE: NORTH CAROLINA
SHEET 11 OF 14
04881CH601a.dwq 6/23/2005
APPLICATION BY: TOWN OF BORROW SITE PROPOSED: HOLDEN BEACH NOURISHMENT
HOLDEN BEACH AT: HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83 TOWN OF HOLDEN .BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA
110 Rothschild Street
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DATE: 06/23/05 SCALE: 1 "=800' Holden Beach, NC 28462 SHEET 12 OF 14 ~ ~w
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04881CHBOlo.dwg 6/23/2005
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WIDTH VARIES
BETWEEN 150'-190'
MHW
BEACH FILL
AREA
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MLW _ EXISTING
GRADE
200 300 400 500
TYPICAL EAST REACH SECTION
DISTANCE FROM
MONUMENT (ft)
600
APPLICATION BY: TOWN OF TYPICAL SECTION PROPOSED: HOLDEN BEACH NOURISHMENT
HOLDEN BEACH (EAST REACH) AT: HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83 TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH cAROUNA
SCALE: 110 Rothschild Street
H:1 »_100' Holden Beach, NC 28462 ~ "
DATE: 06/23/05 V:1 -10 SHEET 13 OF 14 ~r~
04881CH601a.dwg
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-10
-20
WIDTH VARIES
EXISTING
~ ~ _ GRADE
100 200 300 400 500
TYPICAL WEST REACH SECTION
DISTANCE FROM
MONUMENT (ft)
6/23/2005
600
APPLICATION BY: TOWN OF TYPICAL SECTION PROPOSED: HOLDEN BEACH NOURISHMENT
HOLDEN BEACH (WEST REACH) AT: HOLDEN BEACH
VERTICAL DATUM: NGVD 29
HORIZONTAL DATUM: NC GRID NAD 83 TOWN OF HOLDEN BEACH COUNTY OF: BRUNSWICK
BRUNSWICK COUNTY STATE: NORTH CAROLINA
SCALE: 110 Rothschild Street
H:1 ~_ 100' Holden Beach, NC 28462 ' ~• ~-~'~`"
DATE: 06/23/05 V:1 -10 SHEET 14 OF 14
- BEACH FILL
AREA
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PROPOSED HOLDEN BEACH UPLAND BORROW SITE
Wetland Boundaries and Buffers
Summary of Borrow Site Material Characteristics and Beach
Compatibility -Kirby Walter Borrow Site
In order to determine the compatibility of the Kirby Walter Borrow Site material,
ATM contracted with Engineering Consulting Services, Inc. (ECS) to collect 10
soil borings from within the Kirby Walter Borrow Site. The borings began at the
natural ground surface and were driven to a depth of approximately 35 ft to 40 ft
below grade. Continuous split spoon sampling was conducted at 2 ft intervals.
From these 10 borings, 40 composite samples were created and analyzed by
ECS according to standard grain size analysis methods.
The soil borings revealed clay lenses throughout the borrow site, varying in
thickness between 2 ft and 8 ft. Greater thicknesses were found toward the
southwest end of the site. Towards the northeast end, clay lenses were less
substantial and mean sediment grain sizes generally increased. The sediment is
described as light grey, fine to medium sand toward the northeast portion of the
borrow site and brownish grey, fine to medium sand and clayey sand toward the
southwest.
Each composite soil sample selected for grain size analysis was tested in
accordance with ASTM D-422 "Standard Test Method for Particle Size Analysis
of Soils", ASTM D-1140 "Standard Test Method for Amount of Material in Soils
Finer than the No. 200 Sieve". Graduation analysis included the following sieve
sizes: 3/4, 3/8, #4, #10, #20, #40, #60, #100, #200. Geotechnical Summary
Table 1 shows the USCS soils classification, mean grain size, median grain size,
percent fines, and volume of material represented for each composite sample.
Percent fines are reflective of the material that passes the #200 sieve.
Sediments suitable for the beach nourishment typically are expected to contain
less than 10% fines.
The results of the suitability analysis led to a prioritization of the borrow site
based on core samples where the areas to the northeast of the borrow site,
represented by borings B1 through B6, were preferred over areas to the
southwest, represented by borings B7 through B10. When considering the entire
borrow site (including all 40 composite samples) the median. and mean sediment
diameters are 0.23 mm and 0.28 mm, respectively. The percent fines (percent of
material passing the. #200 sieve) is 9.4%. When considering selected vertical
lenses within the preferred region, the median and mean sediment diameters are
0.29 mm and 0.26 mm, respectively. The percent fines reduce to 6.8% for the
preferred region. From these selected layers within the preferred region of the
borrow site, it is estimated that over 800,000 cy of beach quality sediment is
present in the borrow site. Total volume available for excavation and beach
nourishment is subject to the final Corps certified wetland boundaries.
The native beach sediment-was investigated by the USACE in October 1998 in
Preparation of the Environmental Assessment and General Design Memorandum
for the Section 933 project. The USACE collected sediment samples along four
beach profiles within the boundaries of their proposed project. These sediment
profiles were collected at 6,000 to 8,000 foot intervals and included 17 samples
per profile at specified. elevations. The median grain size for the native beach
was determined to be 0.27 mm based on analysis of this data. The data
indicated that approximately 43% of the material is medium grained sand ranging
from 0.13 mm to 0.30 mm in diameter and classified as SP under the unified
Soils Classification System (USCS). Figure 1 shows the grain size distribution
for the entire Kirby Walter Borrow Site ("All Samples"), selected layers of the
preferred areas within .the Kirby Walter Borrow Site ("Selected Samples"), and
the native beach sediment as measured by the USACE.
Table 1. Geotechnical Summary
Sampling Sample USCS Mean d50
Boring tD Sample ID Depth Length Diameter % Pass No. Area Volume Total
ft ft Classification mm (mm) Volume c
O O ( ) 200 Sieve (acres) (cy) (y)
B-1 B-1A 0 to 4 4 SP-SM 0.19 0.19 7.9% 3.86 24,926
B-1 B 4 to 8 4 SM 0.28 0.18 23.9% 3.86 24,926
B-1 C 8 to 32 24 SP 0.23 023 4.8% 3.86 149,557
B-1 D 32 t0 40 8 SP-SC 0.39 0.32 12.1 % 3.86 49,852 249,262
B-2 B-2A 0 to 10 10 SP-SC 0.21 0.21 5.4% 3.02 48,692
8-26 " 10 to 14 4 SC 0.24 0.20 14.7% 3.02 19,477
B-2C 14 to 40 26 SP-SC 0.26 0.29 5.4% 3.02 126,600 194,769
B-3 B-3A 0 to 6 6 SP-SC 0.27 0.26 7.7% 1.51 14,593
B-3B 6 to 10 4 SC 0.34 0.17 33.0% 1.51 9,728
B-3C 10 to 28 18 SP-SC 0.23 0.20 5.5% 1.51 43,778
B-3D 28 to 36 8 SP 0.36 0.38 1.9% 1.51 19,457 87,556
B-4 B-4A 0 to 6 6 SM 0.26 0.19 21.3°~ 3.21. 31,084
B-4B 6 to 10 4 SC 0.51 0.36 22.9% 3.21 20,723
B-4C 10 to 26 16 SP-SC 0.23 0.20 7.4% 3.21 82,890
BAD 26 to 38 12 SP-SC 0.32 029 10.7°k 3.21 62,168
BCE 38 to 40 2 SC 0.85 0.31 15.0% 3.21 10,361 207,226
B-5 B-5A 0 to 6 6 SM-SC 0.22 0.19 19.2% 2.73 26,454
B-5B 6 fo 10 4 SP 0.26 0.31 5.2% 2.73 17,636
B-5C 10 to 14 4 SC 0.36 0.22 28.1 °k 2.73 17,636
B-5D 14 to 40 26 SP _ 0.28 0.31 4.0% 2.73 114,634 176,360
B-6 B-6A' 0 to 4 4 SP-SM 0.19 0.20 8.1 °h 2.80 18,087
B-6B 4 to 14 10 SP-SC 0.23 0.21 8.0% 2.80 45,217
B-6C 14 to 16 2 SC 0.43 0.27 31.3°k 2.80 9,043
B-6D 16 to 40 24 SP 0.26 0.26 3.9°~ 2.80 108,521 180,868
B-7 B-7A 0 to 8 8 SM 0.22 0.18 17.6°~ 3.53 45,611.
B-7B 8 to 24 16 SP-SC 0.21 0.18 10.1°k 3.53 91,222
B-7C 24 to 40 16 SP 0.20 0.21 3.8°~ 3.53 91,222 228,055
B-8 B-8A 0 to 6 6 SP 0.17. 0.20 3.2°~ 3.93 38,069
B-8B 6 to 16 10 SC 0.34 0.13 36.3°k 3.93 63,448
B-8C 16 to 24 8 SP-SC 0.24 022 6.9% 3.93 50,758
B-8D 24 to 40 16 SP 023 0.22 3.6°~6 3.93 101,517 253,792
B-9 B-9A 0 fo 12 12 SM 0.27 0.22 17.6% 2.91 56,365
B-9B 12 to 18 6 SP-SC 0.31 0.28 7.6% 2.91 28,183
B-9C 18 to 26 8 SP-SC 022 0.22 7.6°~ 2.91 37,577
B-9D 26 to 40 14 SP 0.22 0.25 3.4°k 3.00 67.,695 189,820
B-10 B-10A 0 to 8 8 SP 0.18 021 1.8°~6 3.00 38,683
B-10B 8 to 16 8 SC 0.26 0.18 28.3% 3.00 38,683
B-10C 16 to 24 8 SP-SC 0.19 0.20 5.8°! 3.00 38,683
B-l OD 24 to 36 12 SP-SC 0.24 0.21 9.1 % 3.00 58,024
B-l0E 36 to 40 4 SP-SC 027 0.27 6.0% 3.00 19,341 193,414
USACE USACE-1 SP 0.26 0.32 0.0%
USACE-2 SP 0.30 0.39 0.0°k
USACE=3 SP 0.62 0.78 0.0%
0.28 0.23 1,961,121 1,961,121
100.00%
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Legend
• Core Locations
Parcels
Easement
Contours
2s
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-_-_____. 31
-- 32
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~~
POST OFFICE BOX 20336
CHARLESTON, SOUTH CAROLINA 29413-033e
(843} 88Y8150 FAX(Fd3)88d-8935
wvnv.appiedtm.com
PROPOSED KIRBY WALTER UPLAND BORROW SITE
JAN 2005