19990057 Ver 1_Complete File_19990119 (2)

DEPARTMENT OF THE ARMY
WILMINGTON DISTRICT, CORPS OF ENGINEERS
P.O. BOX 1890
WILMINGTON, NORTH CAROLINA 28402-1890
'4..
IN REPLY REFER TO
January 13, 1999
Regulatory Branch
Action ID No. 199920328
Mr. John Dorney
Division of Water Quality
North Carolina;.Department
and Natural Resources
4401 Reedy Creek..Road
Raleigh, North Carolina
of Environment
.jP y •? 44N t •?

Dear Mr. Dorney:
27626-0535
R
Enclosed is the application of the North Carolina State
University, Environmental Health and Safety Center, for
Department of the Army authorization and a State Water Quality
Certification to authorize proposed excavation within Lake
Raleigh, an impoundment to Walnut Creek, to clean out sediment
deposits and restore the original contour to the lake bottom, at
Centennial Campus, North Carolina State University, in Raleigh,
Wake County, North Carolina.
We are considering authorizing the proposed activity pursuant
to Section 404 of the Clean Water Act, and we have determined
that a water quality certification is required under the
provisions of Section 401 of the same law. A Department of the
Army permit will not be granted until the certification has been
obtained or waived.
In accordance with our administrative regulations, in most
cases, 60 days after receipt of a request for certification is a
reasonable time for State action. Therefore, if you have not
acted on the request, or asked for an extension of time, by
March 15, 1999, the District Engineer will deem that waiver has
occurred.
I

Questions or comments may be addressed to Mr. Todd Tugwell,
Raleigh Field Office, Regulatory Division, telephone
[phone], extension 26.
Sincerely,
S. Kenneth Jolly
Manager, Raleigh Regulatory
Field Office
Enclosure
Copy Furnished (without enclosure):
Mr. John Parker
Division of Coastal Management
North Carolina Department of
Environment and Natural Resources
Post Office Box 27687
Raleigh, North Carolina 27611-7687
2
APPLICATION FOR DEPARTMENT OF THE ARMY PERMIT I OMB APPROVAL NO. 0710-003
(33 CAR 325) Expires October 1996
Public reporting burden for this collection of information is estimated to average 5 hours per response, including the time for reviewing instructions,
searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send
c.,mments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to
Department of Defense, Washington Headquarters Service Directorate of InformationOperations and Reports, 1215 Jefferson Davis Highway, Suite
1204, Arlington, VA 22202-4302; and to the Office of Management and Budget, Paperwork Reduction Project (0710-0003), Washington, DC
20503. Please DO NO RETURN your form to either of those addresses. Completed applications must be submitted to the District Engineer having
jurisdiction over the location of the proposed activity.
PRIVACY ACT STATEMENT
Authority: 33 USC 401, Section 10; 1413, Section 404. Principal Purpose: These laws require permits authorizing activities in, or affecting,
navigable waters of the United States, the discharge of dredged or fill material into waters of the United States, and the transportation of dredged
material for the purpose of dumping it into ocean waters. Routine Uses: Information provided on this form will be used in evaluating the application
for a permit. Disclosure: Disclosure of requested information is voluntary. If information is not provided, however, the perreit application cannot be
processed nor can a permit be issued.
One set of original drawings or good reproducible copies which show the location and character of the proposed activity must be attached to this
application (see sample drawings and instructions) and be submitted to the District Engineer having jurisdiction over the location of the proposed
activity. An application that is not completed in full will be returned.
ITEMS 1 THRU 4 TO BE FILLED BY THE CORP
1. APPLICATION NO. 2. FIELD OFFICE CODE 3. DATE RECEIVED 4. DATE APPLICATION COMPLETED
I MCA a 9
/TEMS BELOW TO BE FILLED BY APPL/CAN
LL
5. APPLICANT'S NAME CONTACT: Duane Knudson
orth Carolina State University -
B. AUTHORIZED AGENT'S NAME AND TITLE (on agent is not revuiredl
Barrett Kays & Associates, P.A.
APPLICANT'S ADDRESS
6 9. AGENT'S ADDRESS
.
forth Carolina State University 224 Fayetteville Street Mall, Suite 100
ox 8007, Raleigh, NC 27695 Raleigh, NC 27602
7. APPLICANT'S PHONE NOS. W AREA CODE 10. AGENT'S PHONE NOS. W AREA CODE
a. Residence N/A a. Residence N/A
b. Business 919--515-6859 b. Business 919-828-1903
11. TATE E T OF AUTHORIZATION
Barrett ' to act in my behalf as my agent in the processing of this application and to
;I hereby authorize, -
furnish, upon request, supplemental information in support of this permit application.

SIGNATURE 1 DATE
NAME, LOCATION AND DESCRIPTION OF PROJECT OR ACTIVITY
12. PROJECT NAME OR TITLE Isee instructions)
Lake Raleigh Dredging Project
13. NAME OF WATERBODY, IF KNOWN tifappticabie;
Lake Raleigh
15. LOCATION OF PROJECT
14.' PROJECT STREET ADDRESS ff pplicabtel
North Carolina State University
Centennial Campus
Raleigh, NC
Wake NC I
COUNTY STATE (See vicinity maps 1&2 in attachment 1)
16. OTHER LOCATION DESCRIPTIONS, IF KNOWN, (sminstrucoonsl
17. DIRECTIONS TO THE SITE
see vicinity map 1 &.2 in attachment 1..
ENG FORM 4345, Feb 94 EDITION OF SEP 91 IS OBSOLETE. (Proponent:
18. Mature of Activity (Description of project, include en testuresi
see attachment 1, includes complete alternative analysis
19. Project Purpose (Describe the reason or purpose of the project, see instructions)
see attachment 1
USE BLOCKS 20-22 IF DREDGED AND/OR FILL MATERIAL IS TO BE DISCHARGED
20. Reason(s) for Discharge
No discharge into wetlands or waters of the U.S.
21. Type(s) of Material Being Discharged and the Amount of Each Type in Cubic Yards
Dredged lake bottom sediments. Total sediments volume to be dredged, transported,
and discharged.
22. Surface Area in Acres of Wetlands or Other Waters Filled (see lnstrucdonsl
none
23. Is Any Portion of the Work Already Complete? Yes No X IF YES, DESCRIBE THE COMPLETED WORK
24. Addresses of Adjoining Property Owners, Lessees, Etc., Whose Property Adjoins the Waterbody (If more than can be entered here,
please attach a supplemental list).
see attachment #2 '
25. List of Other Certifications or Approvals/Denials Received from other Federal, State or Local Agencies for Work Described in This Application.
AGENCY TYPE APPROVAL* IDENTIFICATION NUMBER DATE APPLIED DATE APPROVED DATE DENIED
*Would include but is not restricted to zoning, building and flood plain permits
26. Application is hereby made for a permit or permits to authorize the work described in this application. I certify that the information in this
application is complete and accurate. I further certify that 1 possess the authority to undertake the ork described herein or am acting as the
duly authorized agent of the applicant.
GNATURE O PPLICANT DATE SIG ATU F AGENT DATE
The application must be signed by the person who desires to undertake the prop d activity (applicant) or it may be signed by a duly
authorized agent if the statement in block 11 has been filled out and signed.
18 U.S.C. Section 1001 provides that: Whoever, in any manner within the jurisdiction of any department or agency of the United States
knowingly and willfully falsifies, conceals, or covers up any trick, scheme, or disguises a material fact or makes any false, fictitious or
fraudulent statements or representations or makes or uses any false writing or document knowing same to contain any false, fictitious or
fraudulent statements or entry, shall be fined not more than $10,000 or imprisoned not more than five years or both.
U.S.GPO:1994.520-4 78/82018
-E
-v-
s
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
VICINITY MAP 1
7000 0 7000 Feet
I" = 7000'
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
® Barrett Kays &
Associates, P.A.
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
MAP 1 OF 8 DATE: 12-31-98
CENTENNIAL
CAMPUS

N
W E
S
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
VICINITY MAP 2
PROPOSED DREDGING
1500 0 1500 Feet PROJECT
1" = 1500' IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
NCSU APPLICATION BY: NCSU.
CENTENNIAL CAMPUS
RALEIGH, NC MAP 2 OF 8 DATE: 12-31-98
o1CP
00 o a
%8 0
o. No Pn
?,o 0
1
\ VIA \ \
I! ? v
AREA TO BE DREDGED

SYMBOL LEGEND
O ACOE Jurisdiction O Lake Raleigh (Surveyed) Floodway Existing On Property
Streams (Surveyed). Wetlands (Sun•eyed) Disposal Areas Proposed Access Route
_ Ponds RStreams Nnsun•eyzdj Wetl ands (Unsurvzyzd) Sedimentation Basins U Stream Crossings
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
PLAN VIEW
800 0 800 Feet
1" = 800'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
?y
Yt-?
r
N
W E
S
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STA'L'E: NC
APPLICATION BY: NCSU • '
MAP 3 OF 8 DATE: 12-31-98
a?K
SYMBOL LEGEND
Strems (Surveyed) Wetlands (Surveyed) Axes, Route N
- Ponds & Streams (Unsurveyed) Wetlands (Unsurveyed) Dam
ti Walnut Creek within Lake (Unsurveyed) Stream Diversion Small Dmn W E
C? Lake Raleigh (Surveyed) Drainage Ditches Stream Crossing
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
DREDGING PHASE 2:
DIG STREAM DIVERSION
500 0 500
V=500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 5 OF 8 DATE: 12-31-98
SYMBOL LEGEND
Streams (Surveyed) Wetlands (Surveyed) Dan N
- Ponds & Streams (Unsurveyed) Wetlands (Unsurveyed) Small Dan
Walnut Creek within Lake (Unsurveyed) Stream Diversion Stream Crossing W E
U Lake Raleigh (Surveyed) Aocess Route
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE. NAD 1983
IN Barrett Kays &
Associates, P.A.
DREDGING PHASE 3:
NORTHERN HALF OF LAKE
500 0 500
V = 500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 6 OF 8 DATE: 12-31-98
O o0
o 0 0
?a

SYMBOL LEGEND
4W Streams (Surveyed) Wetlands (Surveyed) Existing On Property Stream Crossing N
- Ponds & Streams (Unsur eyed) Wetlands (Unaurveyed) Access Route
Walnut Creek within Lake (Unsurveyed) _ floodway Dam W E
CD Lake Raleigh (Surveyed) Disposal Areas O Approximate Impact Areas
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUI
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
POTENTIAL
ENVIRONMENTAL IMPACTS
800 0 800 Feet
1" = 800'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 7 OF 8 DATE: 12-31-98
-y u

Jill

f ?.
,
f
r
SYMBOL LEGEND
- Ponds & Streams (Unsurveyed) Silt Fence ?S Porrerlme ROW N
Wetlands (Unsurveyed) Perimeter Dike Access Route
Floodway Check Dam ?-? Stream Crossing w E
Disposal Areas Existing On Property.
5
PROPOSED DISPOSAL SITES
PURPOSE: TO RESTORE PROPOSED DREDGING
THE HISTORIC 300 0 300 Feet PROJECT
FUNCTIONS AND VALUES
OF LAKE RALEIGH. IN: WALNUT CREEK, RALEIGH
I" = 300' AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
NC STATE PLAN1:. NAD 1983
NCSU APPLICATION BY: NCSU
Barrett Kays & CENTENNIAL CAMPUS
®Associates, P.A. RALEIGH, NC MAP 8 OF 8 DATE: 12-31-98
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SECTION 1
SEDIMENT DEPTHS
FIGURE 2
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DATES 12/31/98
PROJECT NUMBERt 9806001
NAME' A-xsect.dwg
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SECTMN 2
SEDIMENT DEPTHS
FIGURE 3
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SCALE, Hi 1'=300' V, 11=5'
DATEo 12/31/98
PROJECT NUMBERe 9806001
NAMES A_xsect.dw
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SECTION 3
SEDIMENT DEPTHS
FIGURE 4
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DATE, 12/31/98
PROJECT NUMBERt 9806001
NAMES xsec
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DRAWN BYj JVF

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0009 NU
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
1?•
NC ENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
March 5, 1999
DWQ Project # 990057
Wake County
CERTIFIED MAIL
RETURN RECEIPT REQUESTED
NCSU
Environmental Health and Safety Center
PO Box 8007
Raleigh, NC 27695-8007
Dear Sirs:
The Division of Water Quality has reviewed your plans for the discharge of fill material into
located at Lake Raleigh-Centennial Campus in Wake County for renovation of Lake Raleigh. Insufficient
evidence is present in our files to conclude that your project must be built as planned in waters and/or
wetlands in accordance with 15A NCAC 2H .0506. We have not been able to reach your consultant for a
field visit. Therefore, unless we can meet with your consultant to discuss this project and modifications of
the proposal are made as described below, we will have to move toward denial of your 401 Certification as
required by 15A NCAC 2H .0507(e) and will place this project on hold as incomplete until we receive this
additional information, we are requesting (by copy of this letter) that the U.S. Army Corps of Engineers
place your project on administrative hold.
Please provide us with information supporting your position that states your project must be
constructed as planned and that you have no practicable alternative to placing fill in these waters and/or
wetlands. Specifically can you construct your project with less wetland impact? Any documentation such
as maps and narrative that you can supply to address alternative designs for your project may be helpful in
our review of your 401 Certification. Also this project will require compensatory mitigation as described in
15A NCAC 2H.0506(h).
Please respond within three weeks of the date of this letter by sending a copy of this information to
me and one copy to Mr. Danny Smith Raleigh Regional Office at 3800 Barrett Drive Raleigh NC 27609. If
we do not hear from you in three weeks, we will assume that you no longer want to pursue this project and
we will consider the project as withdrawn. I can be reached at 919-733-1786 id you have any questions.
cer
n R. Dorney
cc: Raleigh DWQ Regional Office
Wilmington Office Corps of Engineers
Central Files
John Dorney
Raleigh Field Office Corps of Engineers
John Parker, DCM
990057.nty
Wetlands/401 Unit 4401 Reedy Creek Road Raleigh, North Carolina 27607
Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post consumer paper
61 I/c, i ?

Streaans (Surveyed)
- Pale S Streams (Unsurveyed)
' ae! Wain Creek within Iake (U=mNeyed)
O Lake Raleigh (Surveyed)
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUE
I OF LAKE RALEIGH.
! NC STATE PLANE, NAD 1983
®Barrett Kays &
Associates, P.A.
SYMBOL LEGEND
4m Wetlands (Surveyed)
wetlands (Unsurveyed)
Mmu ge Ditches
Access Route
DREDGING PHASE 1:
SOUTHERN HALF OF LAKE
500 0 500 D
FEM
1"= 500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
e- ell
T7
Dam N _ ---
Stre= Cressuv
W E
s
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION HY: NCSU
MAP 4 OF 8 DATE: 12-31-98
i
M 22 21999
DEPARTMENT OF THE. ARMY
Wilmington District, Corps of Engineer
Raleigh Regulatory Field Office GROUP
6508 Falls of the Neuse Road, Suite 12 SECTIv`
Raleigh, North Carolina 27615
Action ID No. 199920328 January 21, 1999
PUBLIC NOTICE
North Carolina State University, Environmental Health and
Safety Center, Post Office Box 8007, Raleigh, North Carolina
27695-8007, has applied for a Department of the Army permit TO
AUTHORIZE PROPOSED EXCAVATION WITHIN LAKE RALEIGH, AN IMPOUNDMENT
TO WALNUT CREEK; TO CLEAN OUT SEDIMENT DEPOSITS AND RESTORE
ORIGINAL CONTOUR TO THE LAKE BOTTOM, AT CENTENNIAL CAMPUS, NORTH
CAROLINA STATE UNIVERSITY, in Raleigh, Wake County, North
Carolina.
The following description of the work is taken from data
provided by the applicant and from observations made during an
onsite visit by representatives of the U.S. Army Corps of
Engineers. Plans submitted with the application show the
proposed excavation of sediment Lake Raleigh and the temporary
addition of fill material for two stream crossings immediately
south of the lake. The Lake is now drained and will continue to
remain as such during the entirety of the proposed work. The
dredging area will be approximately 56 acres in size and will be
located within the lower (eastern) portion of the lake. In this
area, between L and 4 feet of sediment will be removed to restore
the contours of the original lake bottom. This will result in an
average lake depth of 5.5 feet below the plane of ordinary high
water, an increase of approximately 1.5 feet compared to pre-
project conditions. In total, approximately 158,000 cubic yards
of sediment is to be removed from the pond bottom and placed in
upland areas in the floodplain immediately downstream of the
lake.
The project will begin with the dredging of a series of
ditches within the bed of the lake to drain the accumulated
sediments to the maximum extent possible, prior to their
excavation. Following this, the dredging of the sediments from
the lake bottom will proceed. During the dredging process, a
diversion ditch will be constructed to allow water from Walnut
Creek to bypass the active work area. All material removed from
the lake will be disposed of and stabilized in upland areas
downstream from the lake.
All
ip'ment to be used in the proposed work includes draglines,
dum??„t_r,IU.-ks, loaders, excavators, bulldozers, and graders.
Plcr?st4o the lake bottom will be from high ground and will not
impact`'any additional jurisdictional areas not already proposed
to be excavated. Additionally, wetland areas that already exist
when the lake is at its ordinary high water mark will be left
undisturbed. The purpose of the excavation is to remove sediment
that has accumulated and restore the lake bottom to its original
contours. Construction of the diversion ditch will allow the
passage of water through the work area with minimal increases in
downstream sediment loads. Plans showing the proposed work are
included with this public notice.
The State of North Carolina will review this public notice to
determine the need for the applicant to obtain any required State
authorization. No Department of the Army (DA) permit will be
issued until the coordinated State viewpoint on the proposal has
been received and reviewed by this agency, nor will a DA permit
be issued until the North Carolina Division of Water Quality
(NCDWQ) has determined the applicability of a Water Quality
Certificate as required by PL 92-500.
This application is being considered pursuant to Section 404
of the Clean Water Act (33 U.S.C. 1344). Any person may request,
in writing within the comment period specified in the notice,
that a public hearing be held to consider this application.
Requests for public hearing shall state, with particularity, the
reasons for holding a public hearing.
The District Engineer has consulted the latest published
version of the National Register of Historic Places for the
presence or absence of registered properties, or properties
listed as being eligible for inclusion therein, and this site is
not a registered property or property listed as being eligible
for inclusion in the Register. Consultation of the National
Register constitutes the extent of cultural resource
investigations by the District Engineer, and he is otherwise
unaware of the presence of such resources. Presently, unknown
archeological, scientific, prehistorical, or historical data may
be lost or destroyed by work under the requested permit.
The District Engineer, based on available information, is not
aware that the proposed activity will affect species, or their
critical habitat, designated as endangered or threatened pursuant
to the Endangered Species Act of 1973.
The decision whether to issue a permit will be based on an
evaluation of the probable impacts, including cumulative impacts,
of the proposed activity and its intended use on the public
2

v
interest. Evaluation of the probable impacts which the proposed
activity may have on the public interest requires a careful
weighing of all those factors which become relevant in each
particular case. The benefits which reasonably may be expected
to accrue from the proposal must be balanced against its
reasonably foreseeable detriments. The decision whether to
authorize a proposal, and if so the conditions under which it
will be allowed to occur, are therefore determined by the outcome
of the general balancing process. That decision should reflect
the national concern for both protection and utilization of
important resources. All factors which may be relevant to the
proposal must be considered including the cumulative effects
thereof. Among those are conservation, economics, aesthetics,
general environmental concerns, wetlands, cultural values, fish
and wildlife values, flood hazards and flood plain values (in
accordance with Executive Order 11988), land use, navigation,
shore 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 placement of dredged or fill materials
in waters of the United States, a permit will be denied if the
discharge that would be authorized by such permit would not
comply with the Environmental Protection Agency's 404(b)(1)
guidelines. Subject to the preceding sentence and any other
applicable guidelines or criteria, a permit will be granted
unless the District Engineer determines that it would be contrary
to the public interest.
The Corps of Engineers 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 of Engineers 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 fora public hearing and to determine the
overall public interest of the proposed activity.
Generally, the decision whether to issue this Department of
the Army (DA) permit will not be made until the North Carolina
Division of Water Quality (NCDWQ) issues, denies, or waives State
certification required by Section 401 of the Clean Water Act.
3

The NCDWQ considers whether or not the proposed activity will
comply with Sections 301, 302, 306, and 307 of the Clean Water
Act. The application and this public notice for the Department
of the Army (DA) permit serves as application to the NCDWQ for
certification.
.Additional information regarding the Clean Water Act
certification may be reviewed at the offices of the Environmental
Operations Section, North Carolina Division of Water Quality
(NCDWQ), Salisbury Street, Archdale Building, Raleigh, North
Carolina. Copies of such materials will be furnished to any
person requesting copies upon payment of reproduction costs.
All persons desiring to
application for Clean Water
writing delivered to the No
Water Quality (NCDWQ), Post
Carolina 27611-7687, on or
Mr. John Dorney.
make comments regarding the
Act certification should do so in
rth Carolina Division of
Office Box 27687, Raleigh, North
before February 12, 1999, Attention:
Written comments pertinent to the proposed work, as outlined
above, will be received in this office, Attention: Mr. Todd
Tugwell, until 4:15 p.m., February 19, 1999, or telephone 919-
876-8441, extension 26.

4
wE
-y-
S
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
VICINITY MAP I
7000 0 7000 Feet
mmmmmwl?
1" = 7000'
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
® Barrett Kays &
Associates, P.A.
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
MAP 1 OF 8 DATE: 12-31-98

CENTENNIAL
CAMPUS
S?epY? ?, V
d
LAKE
RALEIGH
N
W E
S
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
VICINITY MAP 2
1500 0 1500
V = 1500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 2 OF 8 DATE: 12-31-98
11

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0
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Mo 0° oa°o

r
n
SYMBOL LEGEND
O ACOE Jurisdiction O Lake Raleigh (Surveyed) Floodw•a}' Existing On Property N
® Streams (Surveyed) Wetlands (Surveyed) Disposal Areas Proposed Access Route
W E
_ Ponds & Streams (Unsurveyed) Wetlands (Unsurveyed) Sedimentation Basins U Stream Crossings
S
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates; P.A.
PLAN VIEW
800 0
V=800'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
800 Feet
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 3 OF 8 DATE: 12-31-98

® Streams (Surveyed)
- Ponds & Streams (Unsurveyed)
ti Walnut Creek within Lake (Unsurveyed)
O Lake Raleigh (Surveyed)
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
SYMBOL LEGEND
Wetlands (Surveye(f) Access Route N
Wetlands (Unsurveyed) D.
Stream Diversion • Small Dam W E
Drainage Ditches Stream Crossing
S
DREDGING PHASE 2:
DIG STREAM DIVERSION
500 0 500 Feet
V=500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 5 OF 8 DATE: 12-31-98

Streams (Surveyed)
- Ponds & Streams (Unsurveyed)
Walnut Creek within Lake (Unsurveyed)
C? Lake Raleigh (Surveyed)
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE. NAD 1983
® Barrett Kays &
Associates, P.A.
SYMBOL LEGEND
Wetlands (Surveyed) Darn N
Wetlands (Unsorveyed) Small Dam
Stream Diversion Stream Crossing W E
Access Route
S
DREDGING PHASE 3:
NORTHERN HALF OF LAKE
PROPOSED DREDGING
PROJECT
500 0 500
I" = 500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 6 OF 8 DATE: 12-31-98

C3
op
0 0
III,

c
d
SYMBOL LEGEND
® Streams (Surveyed) Wetlands (Surveyed) Existing On Property .--. Stream Crowing N
- Ponds & Streams (Unsurveyed) Wetlands (Unsurveyed) Access Route
Walnut Creel; within Lake (Unsurveyed) Floodway 400MINN1110 Dam W E
O Lake Raleigh (Surveyed) Disposal Area O Approximate Impact Areas
S
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUI
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
POTENTIAL
ENVIRONMENTAL IMPACTS
800 0 800 F
1" = 800'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 7 OF 8 DATE: 12-31-98

ft
a

PROPOSED DISPOSAL SITES PROPOSED DREDGING
PURPOSE: TO RESTORE
THE HISTORIC 300 0 300 Feet PROJECT
FUNCTIONS AND VALUES
OF LAKE RALEIGH. IN: WALNUT CREEK, RALEIGH
V = 300' AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
NC STATE PLANE. NAU 1983
NCSU APPLICATION BY: NCSU
Barrett Kays & CENTENNIAL CAMPUS
®Associates, P.A. RALEIGH, NC MAP 8 OF 8 DATE: 12-31-98
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BARRETT KAYS do ASSOCIATES, PA
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Eft9k-rirw / E-*wtrnentoi A-9owrent
224 Fayett Is Sbvot Nail. Suit 100
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SECTION 2
SEDIMENT DEPTHS
FIGURE 3
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DATEt 12/31/98
PROJECT NUMBER, 9806001
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SECTMN 3
SEDIMENT DEPTHS
FIGURE 4
SCALE, 1+ 1'=300' V, 1'=5'
DATE+ 12/31/98
PROJECT NUMBERe 9806001
NAMES A_xsect.dwq
DRAWN BYi JVF
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SECTION 4
SEDIMENT DEPTHS
FIGURE 5
SCALE, Hs 1'=300' Vo 10=5'
DATE] 12/31/98
PROJECT NUMBERS 9806001
NAMEo A_xsect.dw
DRAWN BY+ JWF

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JAMES B. HUNTJR.
GOVERNOR
? MEMORANDUM

:WAtiNE MCDEVI'[T TO:
SECRETARY

r_ FROM:
DONNA D. MOFF ITT
?'?DIRECTOR
I
SUBJECT:
Lr.

"mot NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF COASTAL- MANAGEMENT
January 26, 1999
Mr. A. Preston Howard, P. E.
Director
Division of Water Quality
John R. Parker, Jr.
Inland "404 Coordinator
"404" Project Review
? -the attached U.S. Army Corps of Engineers Public Notice for Action No. 199920328 dated
T. January 21, 1999 describing a proposed project by NC State University is being circulated to
uiterested state agencies for comments on applicable Section 404 and/or Section 10 permits.
3?lease indicate below your agency's position or viewpoint on the proposed project and return this
i ,.. orm by 2/19/99. If you have any questions regarding the proposed project, please contact me at
?_- :-,-333-2293. When appropriate, in-depth comments with supporting data is requested.
r
_ PLY

This office supports the project proposal.
No comment.
Comments on this project are attached.
This office objects to the project as proposed.
igned Date
P.O. BOX 27687, RALEIGH, NC 2761 1-7687 /2728 CAPITAL BLVD., RALEIGH, NC 27604
PHONE [phone] FAX [phone]
AN EQUAL OPPORTUNITY /AFFIRMATIVE ACTION EMPLOYER - 50% RECYCLED/1 O% POST-CONSUMER PAPER
i
i<
DEPARTMENT OF THE ARMY
Wilmington District, Corps of Engineers
Raleigh Regulatory Field Office
6508 Falls of the Neuse Road, Suite 120
Raleigh, North Carolina 27615
Action ID No. 199920328
January 21, 1999
PUBLIC NOTICE
North Carolina State University, Environmental Health and
Safety Center, Post Office Box 8007, Raleigh, North Carolina
27695-8007, has applied for a Department of the Army permit TO
AUTHORIZE PROPOSED EXCAVATION WITHIN LAKE RALEIGH, AN IMPOUNDMENT
TO WALNUT CREEK, TO CLEAN OUT SEDIMENT DEPOSITS AND RESTORE
ORIGINAL CONTOUR TO THE LAKE BOTTOM, AT CENTENNIAL CAMPUS, NORTH
CAROLINA STATE UNIVERSITY, in Raleigh, Wake County, North
Carolina.
The following description of the work is taken from data
provided by the applicant and from observations made during an
onsite visit by representatives of the U.S. Army Corps of
Engineers. Plans submitted with the application show the
proposed excavation of sediment Lake Raleigh and the temporary
addition of fill material for two stream crossings immediately
south of the lake. The Lake is now drained and will continue to
remain as such during the entirety of the proposed work. The
dredging area will be approximately 56 acres in size and will be
located within the lower (eastern) portion of the lake. In this
area, between 1 and 4 feet of sediment will be removed to restore
the contours of the original lake bottom. This will result in an
average lake depth of 5.5 feet below the plane of ordinary high
water, an increase of approximately 1.5 feet compared to pre-
project conditions. In total, approximately 158,000 cubic yards
of sediment is to be removed from the pond bottom and placed in
upland areas in the floodplain immediately downstream of the
lake.
The project will begin with the dredging of a series of
ditches within the bed of the lake to drain the accumulated
sediments to the maximum extent possible, prior to their
excavation. Following this, the dredging of the sediments from
the lake bottom will proceed. During the dredging process, a
diversion ditch will be constructed to allow water from Walnut
Creek to bypass the active work area. All material removed from
the lake will be disposed of and stabilized in upland areas
downstream from the lake.
i

Equipment to be used in the proposed work includes draglines,
dump trucks, loaders, excavators, bulldozers, and graders.
Access to the lake bottom will be from high ground and will not
impact any additional jurisdictional areas not already proposed
to be excavated. Additionally, wetland areas that already exist
when the lake is at its ordinary high water mark will be left
undisturbed. The purpose of the excavation is to remove sediment
that has accumulated and restore the lake bottom to its original
contours. Construction of the diversion ditch will allow the
passage of water through the work area with minimal increases in
downstream sediment loads. Plans showing the proposed work are
included with this public notice.
The State of North Carolina will review this public notice to
determine the need for the applicant to obtain any required State
authorization. No Department of the Army (DA) permit will be
issued until the coordinated State viewpoint on the proposal has
been received and reviewed by this agency, nor will a DA permit
be issued until the North Carolina Division of Water Quality
(NCDWQ) has determined the applicability of a Water Quality
Certificate as required by PL 92-500.
This application is being considered pursuant to Section 404
of the Clean Water Act (33 U.S.C. 1344). Any person may request,
in writing within the comment period specified in the notice,
that a public hearing be held to consider this application.
Requests for public hearing shall state, with particularity, the
reasons for holding a public hearing.
The District Engineer has consulted the latest published
version of the National Register of Historic Places for the
presence or absence of registered properties, or properties
listed as being eligible for inclusion therein, and this site is
not a registered property or property listed as being eligible
for inclusion in the Register. Consultation of the National
Register constitutes the extent of cultural resource
investigations by the District Engineer, and he is otherwise
unaware of the presence of such resources. Presently, unknown
archeological, scientific, prehistorical, or historical data may
be lost or destroyed by work under the requested permit.
The District Engineer, based on available information, is not
aware that the proposed activity will affect species, or their
critical habitat, designated as endangered or threatened pursuant
to the Endangered Species Act of 1973.
The decision whether to issue a permit will be based on an
evaluation of the probable impacts, including cumulative impacts,
of the proposed activity and its intended use on the public
2
i
f ?
interest. Evaluation of the probable impacts which the proposed
activity may have on the public interest requires a careful
weighing of all those factors which become relevant in each
particular case. The benefits which reasonably may be expected
to accrue from the proposal must be balanced against its
reasonably foreseeable detriments. The decision whether to
authorize a proposal, and if so the conditions under which it
will be allowed to occur, are therefore determined by the outcome
of the general balancing process. That decision should reflect
the national concern for both protection and utilization of
important resources. All factors which may be relevant to the
proposal must be considered including the cumulative effects
thereof. Among those are conservation, economics, aesthetics,
general environmental concerns, wetlands, cultural values, fish
and wildlife values, flood hazards and flood plain values (in
accordance with Executive Order 11988), land use, navigation,
shore 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 placement of dredged or fill materials
in waters of the United States, a permit will be denied if the
discharge that would be authorized by such permit would not
comply with the Environmental Protection Agency's 404(b)(1)
guidelines. Subject to.the preceding sentence and any other
applicable guidelines or criteria, a permit will be granted
unless the District Engineer determines that it would be contrary
to the public interest.
The Corps of Engineers 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 of Engineers 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.
Generally, the decision whether to issue this Department of
the Army (DA) permit will not be made until the North Carolina
Division of Water Quality (NCDWQ) issues, denies, or waives State
certification required by Section 401 of the Clean Water Act.
3
a

The NCDWQ considers whether or not the proposed activity will
comply with Sections 301, 302, 306, and 307 of the Clean Water
Act. The application and this public notice for the Department
of the Army (DA) permit serves as application to the NCDWQ for
certification.
Additional information regarding the Clean Water Act
certification may be reviewed at the offices of the Environmental
Operations Section, North Carolina Division of Water Quality
(NCDWQ), Salisbury Street, Archdale Building, Raleigh, North
Carolina. Copies of such materials will be furnished to any
person requesting copies upon payment of reproduction costs.
All persons desiring to
application for Clean Water
writing delivered to the No
Water Quality (NCDWQ), Post
Carolina 27611-7687, on or
Mr. John Dorney.
make comments regarding the
Act certification should do so in
rth Carolina Division of
Office Box 27687, Raleigh, North
before February 12, 1999, Attention:
Written comments pertinent to the proposed work, as outlined
above, will be received in this office, Attention: Mr. Todd
Tugwell, until 4:15 p.m., February 19, 1999, or telephone 919-
876-8441, extension 26.
4
'E
S
VICINITY MAP 1
PURPOSE: TO RESTORE PROPOSED DREDGING
THE HISTORIC PROJECT
FUNCTIONS AND VALUES 7000 0 7000 Feet
OF LAKE RALEIGH. IN: WALNUT CREEK, RALEIGH
1 " = 7000' AT: LAKE RALEIGH
NC STATE PLANE, NAD 1983 COUNTY OF: WAKE STATE: NC
NCSU APPLICATION BY: NCSU
® Barrett Kays & CENTENNIAL CAMPUS
Associates, P.A. RALEIGH, NC MAP 1 OF 8 DATE: 12-31-98
- n figure u_app_ .apr
CENTENNIAL
CAMPUS
• S?
i LAKE
RALEIGH i
N
W E
S
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
VICINITY MAP 2
1500 0 1500
1" = 1500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 2 OF 8 DATE: 12-31-98

C= 11 Q
a
o . od O
9 O a C20
.v?...
?7y
r
SYMBOL LEGEND
O ACOE Jurisdiction O Lake Raleigh (Surveyed) Floodway Existing On Property N
® Streams (Surveyed)
Wetlands (Surveyed) Disposal Areas Proposed Access Route
(ED 4M
W E
_ Ponds & Streams (U nsurveyed) (ED Wetlands (Unsurveyed) Sedimentation Basins .J Stream Crossings
S
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
PLAN VIEW
800 0
1 " = 800'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
800
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 3 OF 8 DATE: 12-31-98

SYMBOL LEGEND
® Streams (Surveyed) Wetlands (Surveyed) Dam N
- Ponds S Streams (Unsurveyed) Wetlands (Unsurveyed) .--? Stream Crossing
Walnut Creek within Lake (Unsurveyed) Drainage Ditches W E
U Lake Raleigh (Surveyed) Access Route
PURPOSE: TO RESTORE DREDGING PHASE 1: PROPOSED DREDGING
THE HISTORIC SOUTHERN HALF OF LAKE PROJECT
FUNCTIONS AND VALUES 500 0 500 Feet
OF LAKE RALEIGH. mmmmmmm? IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
NC STATE PLANE, NAD 1983 1" = 500' COUNTY OF: WAKE STATE: NC
NCSU APPLICATION BY: NCSU
® Barrett Kays & CENTENNIAL CAMPUS MAP 4 OF 8 DATE: 12-31-98
Associates, P.A. RALEIGH, NC

SYMBOL LEGEND
® Streams (Surveyed) Wetlands (Surveyed) Access Route
N
- Ponds & Streams (Unsurveyed) Wetlands (Unsurveyed) D.
Walnut Creels within Lake (Unsurveyed) Stream Diversion • Small Dam W E
U Lake Raleigh (Surveyed) Drainage Ditches -- Stream Crossing
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
13] Barrett Kays &
Associates, P.A.
DREDGING PHASE 2:
DIG STREAM DIVERSION
500 0 500 Feet
I" = 500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK. RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 5 OF 8 DATE: 12-31-98
Streams (Surveyed)
_ Ponds & Streams (Unsurveyed)
Walnut Creek within Lake (Unsurveyed)
O Lake Raleigh (Surveyed)
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUES
OF LAKE RALEIGH.
NC STATE PLANE. NAD 1983
® Barrett Kays &
Associates, P.A.
SYMBOL LEGEND
-•.4,?"???,„">?`°a' wetlands (Surveyed) Dan N
Wetlands (Unsur?eyed) Small Dam
Stream Diversion Stream Crossing W E
Access Route
DREDGING PHASE 3:
NORTHERN HALF OF LAKE
500 0 500
I"=500'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 6 OF 8 DATE: 12-31-98

C30
l?
?/ ??
17
n
d
SYMBOL LEGEND
® Streams (Surveyed) Wetlands (Surveyed) Existing On Property Stream Crossing N
_ Ponds & Streams (Unsurveyed) Wetlands (Unsurveyed) Access Route
Walnut Creek within Lake (Unsurveyed) floodway Dam W E
O Lake Raleigh (Surveyed) - Disposal Areas O Approximate Impact Areas
S
PURPOSE: TO RESTORE
THE HISTORIC
FUNCTIONS AND VALUI
OF LAKE RALEIGH.
NC STATE PLANE, NAD 1983
® Barrett Kays &
Associates, P.A.
POTENTIAL
ENVIRONMENTAL IMPACTS
800 0 800
1" = 800'
NCSU
CENTENNIAL CAMPUS
RALEIGH, NC
PROPOSED DREDGING
PROJECT
IN: WALNUT CREEK, RALEIGH
AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
APPLICATION BY: NCSU
MAP 7 OF 8 DATE: 12-31-98
4

4 {d 1: Y Y3 5 ?,l d ? t' a ' . ,.? 3 s1? F.'?z 4'-- -H 'T.,?' - ?, ? -a'
- Ponds & Streams (Unsurveyed) C? Silt Fence ---- -+ Powerhne ROW N
Wetlands (Unsurveyed) Perimeter Dike Access Route
Floodway Check Dam .--? Stream Crossing w E
y. Disposal Areas Existing On Property S'
PROPOSED DISPOSAL SITES
PURPOSE: TO RESTORE PROPOSED DREDGING
THE HISTORIC 300 0 300 Feet PROJECT
FUNCTIONS AND VALUES
OF LAKE RALEIGH. IN: WALNUT CREEK, RALEIGH
1" = 300' AT: LAKE RALEIGH
COUNTY OF: WAKE STATE: NC
NC STATE PLANE. NAD 1983
NCSU APPLICATION BY: NCSU
Barrett Kays & CENTENNIAL CAMPUS
Associates, P.A. RALEIGH, NC MAP 8 DATE: 12-31-98
[31 OF 8

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SECTM 3
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FIGURE 4
SCALE, H, 1'=300' V, 1'=5'
DATE, 12/31/98
PROJECT NUMBER, 9806001
NAME, A-xsect.dwg
DRAWN BY, JWF

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SECTION 4
SEDIMENT DEPTHS
FIGURE 5
SCALE, Hs 1'=300' V, 14=5'
DATES 12/31/98
PROJECT NUMBER# 9806001
NANEo A xsect.dw
DRAWN BY3 JWF
LIMN lwav 600 800 1000 1200 1400 1600 1800
4
81LT FENCE TO BE PLACED AROLND
PERIMETER CF DISPOSAL AREA
EARTHEN DIKE TO BE PLACED AROUND'
PERIMETER OF DISPOSAL AREA
RIS
HEIGHT ¦ 1, SLOPE = 1,1 MAX (TY)-)
w
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LT FENCE TO BE PLACM ARgIdD
1cE UOSTER OF DISPOSAL AREA
EARTHEN DIKE TO BE PLACED AROLND
PERMTER OF DISPOUAL AREA w
HEIGHT • 1', SLOPE • 2s1 MAX (TY'P)
i~
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COMPACTED SPOIL MATERIAL (EKHT APPROX 49 \ EXISTING CREEK
BARRETT KAYS & ASSOCIATES' P-k SCALE, NOT TO SCALE
G,,,1 Engino inn / F„a,ar,a,.tai TYPICAL DISPOSAL AREA DETAIL DATE, 12/31/98
Evn-iny / E-*-wwtal Anmwnw t PROJECT NUMBERS 9806001
224 Fayett&AW Sbv*t MdL Suits too I NAME, A_dispos.dwg
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T00'd 6980#
U.S. Army Corps of Engineers
Rale gh Regulatory Field Officc
508 Falls of the Neuse Road
Suite 120
Raleigh, North Carolina 27615
Phone: [phone]
Fax: [phone]
FAX COVER SHEET
Date: 6-30-99
Message to: _ (2 1 nd .r -I I
7 33- 9gs9
From: -10D D (3,
Total number of pages including cover page: ?.
If all pages are not received, please call 876-8441.
69:eT 666T,Oe'Hrnr
JUN.30'1999 13:59
V
v
#0869 P.002
L5 JW 4470 26
L6 JW 862 26
0 JW 1954 26
L8 JW 874 26
L9 JW 1806 26
L10 JW 1529 26
L11 JW 2374 26
SDI JW 310 26
SD2 JW 800 26
SD3 JW 613 26
SD4 C14 289 78 26
U l JW 433 26
U2 JW 488 _ 26
U3 JW r 2035 26
U4 _
CH 467 22 26
Applicat ion Totals F 34,979 0.92 acres 444 22 ----
Table 2. Impact summary arranged according to permit.
Permit W Channel (Li»cas Ft.
Minor M&r
26 28167 78
14 8389
12 3423 22
Channel impacts requested under Nationwide 14 have not bon counted toward the channel impact
total-
Please call if you have questions.
Sincerely,
ike-ILMALL-
Biologist / Project Manager
Attachments: Pro-construction Notification Form
Site Plan / Impact Maps ((1) 8 %s x 14, (4) subset enlargements and (1) 24 x 36)
Agent Authorization Form
Site Vicinity Map
(2) Data Forms
401 WQC (05/05198-DWQ # 980175)
Ncuse Basin Buffer Letter and Map (08/14/98)
$475.00 Check for 401/NBR Pcnnit Processing Fee
I.- ,
Ral
(91
Questions or comment
nigh Field Office, Re
) 876--8441, extensior
s may be addressed to Mr. Todd Tugwell,
;ulatory Division, telephone
26,
Sincerely,
FILLNAHE:RALEIGADWQ.DOC
CESAW-RG-R/TUGWELL/TS
CFSAW-RG-R/JOLLY/s
WAIL,
CESAW-RG-R/FILE
S. Kenneth Jolly
Manager, Raleigh Regulatory
Field Office
Enc osure
Cop Furnished (without nclosure):
Mr. John Parker
Div Sion of Coastal Management
Nor h Carolina Department of
E vironment and Natural. Resources
Fos Office Box 27687
Ral igh, North Carolina 27611-7687
SUP NSE
2
£00'd 6980#
65:£T 666T,0£'unr

DEP
Wilmington 1
Raleigh
6508 Falls 4
Raleigh
ActI
Saf
276
TO
ORI
.on ID No. 199920328
North Carolina State
rty Center, Post Offi
i5-8007, has applied
[ORIZE PROPOSED EXCAV
1ALNUT CREEK, TO CLEA
;INAL CONTOUR TO 1HE
)LINA STATE UNIVERSIT
Carolina.
The following descri
pro ided by the applican
ons to visit by represen
Eng neers. Plans submit
pro osed excavation of s
add tion of fill materia
sou h of the lake. The
rem in as such during th
dre ging area will be ar
loc ted within the lower
are between 1 and 9 fe
the contours of the orig
ave age lake depth of 5.
wat r, an increase of ar
pro ect conditions. In
of ediment is to be ren
upl nd areas in the floc
lak .
The project will be
dit hes within the bed
Bed ments to the maximu
exc vation. Following
the lake bottom will pr
di rsion ditch will be
Cre k to bypass the act
the lake will be dispos
do stream from the lak
$00'd 6980#
ARTMENT OF THE ARMY
>istrict, Corps of Engineers
Regulatory Field Office
>f the Neuse Road, Suite 120
, North Carolina 21615
January 21, 1999
PUBLIC NOTICS
University, Environmental Health and
se Box 8007, Raleigh, North Carolina
`or a Department of the Army permit TO
?TION WITHIN LAKE RALEIGH, AN IMPOUNDMENT
I OUT SEDIMENT DEPOSITS AND RESTORE
AKE BOTTOM, AT CENTENNIAL CAMPUS, NORTH
in Raleigh, Wake County, North
tion of the work is taken from data
and from observations made during an
atives of the U.S. Army Corps of
ed with the application show the
diment Lake Raleigh and the temporary
for two stream crossings immediately
ake is now drained and will continue to
entirety of the proposed work. The
roximately 56 acres in size and will be
(eastern) portion of the lake. In this
t of sediment will be removed to restore
nal lake bottom. This will result in an
feet below the plane of,ordinary high
roximately 1.5 feet compared to pre-
otal, approximately 158,000 cubic yards
ved from the pond bottom and placed in
plain immediately downstream of the
n with the dredging of a series of
the lake to drain the accumulated
extent possible, prior to their
is, the dredging of the sediments from
eed. During the dredging process, a
onstructed to allow water from Walnut
e work area. All material removed from
of and stabilized in upland areas
69:ET 666T,0C'xno
Equipment to be used in the proposed work includes draglines,
dum trucks, loaders, excavators, bulldozers, and graders.
Acc ss to the lake bottom will be from high ground and will not
imp ct any additional jurisdictional areas not already proposed
to a excavated. Additionally, wetland areas that already exist
whe the lake is at its ordinary high water mark will be left
and sturbed. The purpose of the excavation is to remove sediment
tha has accumulated and restore the lake bottom to its original
con ours. Construction f the diversion ditch will allow the
pas age of water through Ithe work area with minimal increases in
dow stream sediment load . Puns showing the proposed work are
inc uded with this publi notice.
The State of North Carolina will review this public notice to
det rmine the need for Ue applicant to obtain any required State
aut orization. No Depar ment of the Army (DA) permit will be
iss ed until the coordinated State viewpoint on the proposal has
bee received and reviewfd by this agency, nor will a DA permit
be ssued until the Nort Carolina Division of Water Quality
(NC WQ) has determined tie applicability of a Water Quality
Cer ificate as required ]'y PL 92-500.
This application is Ilbeing considered pursuant to Section 404
of he Clean Water Act (33 U.S.C. 1344). Any person may request,
in riting within the comment period specified in the notice,
tha a public hearing beheld to consider this application.
Req ests for public hear?ng shall state, with particularity, the
rea ons for holding a public hearing.
i
The District Enginee.T has consulted the latest published
ver ion of the National ?egister of Historic Places for the
pre ence or absence of r gistered properties, or properties
lis ed as being eligible for inclusion therein, and this site is
not a registered propert? or property listed as being eligible
for inclusion in the Reg'ster. Consultation of the National
Reg ster constitutes the extent of cultural resource
inv stigations by the District Engineer, and he is otherwise
una are of the presence of such resources. Presently, unknown
arc eological, scientific, prehistorical, or historical data may
be ost or destroyed by ?ork under the requested permit.
The District Enginee , based on available information, is not
awa a that the proposed activity will affect species, or their
cri ical habitat, designated as endangered or threatened pursuant
to he Endangered Speciep Act of 1973.
ev
of
The decision whether!to issue a permit will be based on an
uation of the probable impacts, including cumulative impacts,
he proposed activityland its intended use on the public
2
900'a 69800 69:£T 666T,Oe'unr
i
int rest. Evaluation of.the probable impacts which the proposed
act vity may have on the,public interest requires a careful
Wei hing of all those factors which become relevant in each
par icular case. The benefits which reasonably may be expected
to Iccrue from the proposal must be balanced against its
rea onably foreseeable detriments. The decision whether to
aut orize a proposal, and if so the conditions under which it
wil be allowed to occur; are therefore determined by the outcome
of he general balancing process. That decision should reflect
the national concern for'both protection and utilization of
important resources. All factors which may be relevant to the
proposal must be considered including the cumulative effects
the eof. Among those are conservation, economics, aesthetics,
gen ral environmental concerns, wetlands, cultural values, fish
and wildlife values, flood hazards and flood plain values (in
acc rdance with Executive Order 11988), land use, navigation,
sho a erosion and accretion, recreation, water supply and
con ervation, water quality, energy needs, safety, food and fiber
pro action, mineral needs, considerations of property ownership,
and in general, the needs and welfare of the people. For
act vities involving the placement of dredged or fill materials
in aters of the United States, a permit will be denied if the
dis harge that would be authorized by such permit would not
com ly with the Environmental Protection Agency's 404(b)(1)
gui elines. Subject to the preceding sentence and any other
app icable guidelines or criteria, a permit will be granted
unl ss the District Engineer determines that it would be contrary
to he public interest.
The Corps of Engineers is soliciting comments from the
public; Federal, State and local agencies and officials; Indian
Tr es and other interested parties in order to consider and
evaluate the impacts of this proposed activity. Any comments
re ived will be considered by the Corps of Engineers to
de ,mine whether to issue, modify, condition or deny a permit
fo this proposal. To make this decision, comments are used to
as ss impacts on endangered species, historic properties, water
qu ity, general environmental effects and the other public
in rest factors listed above. Comments are used in the
pr aration of an Environmental Assessment (EA) and/or an
En 'ronmental Impact Statement (EIS) pursuant to the National
En -ronmental 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.
Generally, the decision whether to issue this Department of
th Army (DA) permit will not be made until the North Carolina
Di ision of Water Quality (NCDWQ) issues, denies, or waives State
ce tification required by Section 401 of the Clean Water Act.
9001a 6980# 00:tT 666T.0V Mnr
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Act
of
cer
NCDWQ considers whether or not the proposed activity will
>ly with Sections 301, 302, 306, and 307 of the Clean Water
The application and this public notice for the Department
:he Army (DA) permit serves as application to the NCDWQ for
:ification.
Additional information regarding the Clean Water Act
cer ification may be reviewed at the offices of the Environmental
Ope ations Section, North Carolina Division of Water Quality
(NC WO), Salisbury Street, Archdale Building, Raleigh, North
Car lina. Copies of such materials will be furnished to any
per on requesting copies upon payment of reproduction costs.
All persons desiring to make comments regarding the
app ication for Clean Water Act certification should do so in
wri ing delivered to the North Carolina Division of
Wat r Quality (NCDWQ), Post Office Box 27687, Raleigh, North
Car Tina 27611-7687, on or before February 12, 1999, Attention:
Mr John Dorney.
Tu
87
Written comments pertinent to the proposed work, as outlined
e, will be received in this office, Attention: Mr. Todd
all, until 4:15 p.m., February 19, 1999, or telephone 919-
8441, extension 26.
4
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State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Kerr T. Stevens, Director
June 9, 1999
NCSU
Environmental Health and Safety Center
PO Box 8007
Raleigh, NC 27695-8007
Dear Sirs:
Re: Lake Raleigh-Centennial Campus
Wake County
DWQ # 990057
1 ••
NC ENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
On March 5, 1999 the Division of Water Quality sent a letter stating your project
was on hold to see if you could construct your project with less wetland impact. To date,
we have not received the mentioned information regarding this project.
As stated in the letter, you were given three weeks to respond. As of June 9,
1999, we are considering your project as withdrawn. If you would like to resubmit this
project, you will need to send a check in the amount of $200.00 and seven copies of the
PCN application.
If you have any questions, please contact John Dorney at 919-733-1786.
Sincerely,
John R. Dorney
cc: Raleigh DWQ Regional Office
Wilmington District Office Corps of Engineers
Raleigh Field Office Corps of Engineers
John Dorney
Central Files
John Parker, DCM
Wetlands/401 Unit 4401 Reedy Creek Road Raleigh, North Carolina 27607
Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post consumer paper
` a .
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
Mr. Duane Knudson
Environmental Affairs Manager
North Carolina State University
Environmental Health and Safety Center
PO Box 8007
Raleigh, NC 27695-8007
1 ? •
10 Sol,%
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
February 14, 2000
Subject: Lake Raleigh Dredging,
Wake County
DWQ No. 9900057; DOA Action ID. NO. 199920328
Dear Knudson:
Attached hereto is a copy of Certification No. 3265 issued to North Carolina State University, dated
February 14, 2000.
If we can be of further assistance, do not hesitate to contact us.
incerel
tit
tevens
S
?1?
Attachments
990057
cc: Todd Tugwell, Corps of Engineers, Raleigh Regulatory Field Office
Beth Barnes, DWQ, Raleigh Regional Office
File Copy
Central Files
Doug Huggett; DCM
Donald Basinger; Applied Geosciences and Engineering
Division of Water Quality • Non-Discharge Branch
401 Wetlands Unit, 1621 Mail Service Center., Raleigh, NC 27699-1621 Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer • 50% recycled/10% post consumer paper

NORTH CAROLINA 401 WATER QUALITY CERTIFICATION
THIS CERTIFICATION is issued in conformity with the requirements of Section 401
Public Laws 92-500 and 95-217 of the United States and subject to the North Carolina Division
of Water Quality (DWQ) Regulations in 15 NCAC 2H, Section .0500. This certification
authorizes North Carolina State University to excavate within Lake Raleigh in order to clean out
sediment deposits and restore the original contours of the lake pursuant to an application filed on
the 2151 day of December of 1998 and the additional information as depicted in the plans labeled
August 31, 1999 Lake Raleigh Sediment Removal Project Phase 2 provided to DWQ by North
Carolina State University and letter to the SEPA Coordinator dated December 9, 1999.
The application and the plans labeled Lake Raleigh Sediment Removal Project Phase 2,
dated August 31, 1999 provides that the excavation activities and the spoil disposal areas provide
adequate assurance that the proposed activity will not result in a violation of applicable Water
Quality Standards and or in fill of wetlands due to spoil (sediment) disposal. Therefore, the State
of North Carolina certifies that this activity will not violate the applicable portions of Sections
301, 302, 303, 306, 307 of PL 92-500 and PL 95-217 if conducted in accordance with the
application and conditions hereinafter set forth.
This approval is only valid for the purpose and design that you submitted in your
application and as described in the Public Notice. If you change your project, you must notify us
and send us a new application for a new certification. If the property is sold, the new owner must
be given a copy of the Certification and approval letter and is thereby responsible for complying
with all conditions. Should additional wetland or stream fill be requested in the future,
compensatory mitigation may be required as described in 15A NCAC 2H.0506 (h) (6) and (7).
For this approval to be valid, you must follow the conditions listed below. In addition, you
should get any other federal, state or local permits before you go ahead with your project
including (but not limited to) Solid Waste, Sediment and Erosion control, Non-discharge and
Water Supply Watershed regulations.
Condition(s) of Certification:
1. Approved sediment and erosion control devices and practices which equal or exceed
those outlined in the most recent version of the "North Carolina Sediment and Erosion
Control Planning and Design Manual" or the "North Carolina Surface Mining Manual"
(available from the Division of Land Resources in the DEHNR Regional or Central
Offices) shall be properly implemented.
2. In order to prevent violations of the turbidity standards outside the area of construction
(50 NTU's in streams and rivers not designated as trout waters by DWQ; 25 NTU's in
all saltwater classes, and all lakes and reservoirs; 10 NTU's in trout waters) compliance
with the approved Sedimentation and Erosion Control Plan is required.
3. Waste, fill or spoil from excavation efforts will.not be placed, dumped or located in
jurisdictional wetlands.
4. Waste, fill, or spoil from excavation efforts will not be placed within the 50 foot Neuse
River stream buffer zone (as described in 15A NAC 2B .0233).
4r
5. Waste, fill, or spoil from the excavation efforts will not be allowed to be placed in
locations outside of the designated disposal areas as detailed in the plans labeled Lake
Raleigh Sediment Removal Project Phase 2, dated August 31, 1999.
6. All sediment and erosion control measures placed in wetlands or waters shall be
removed and the natural grade restored after the Division of Land Resources releases
the project;
7. The maintenance of a complete and stable containment dike is required as depicted in
the plans labeled Lake Raleigh Sediment Removal Project Phase 2, dated August 31,
1999.
8. Measures shall be taken to prevent live or fresh concrete from coming into contact with
waters of the State until the concrete has hardened.
Violations of any condition herein set forth shall result in revocation of this Certification
and may result in criminal and/or civil penalties. This Certification shall become null and void
unless the above conditions are made conditions of the Federal 404 Permit. This Certification
shall expire upon expiration of the 404 Permit.
If this Certification is unacceptable to you have the right to an adjudicatory hearing upon
written request within sixty (60) days following receipt of this Certification. This request must
be in the form of a written petition conforming to Chapter 150B of the North Carolina General
Statutes and filed with the Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C.
27611-7447. If modifications are made to an original Certification, you have the right to an
adjudicatory hearing on the modifications upon written request within sixty (60) days following
receipt of the Certification. Unless such demands are made, this Certification shall be final and
binding.
This the 14th day of February 2000
DIVI,SJON OF WATER QUALITY
Stevens
WQC # 3265
DIV WATER QUALITY Fax:[phone] Dec 9 '99 1240 P.02
NCSaJfENVR H&S CENTER
TEL : [phone]
Dec 09199 13:03 No.010 P.02
Nadi CWur?s Sate Ultimo * it a i 16" O flwiM SO M "I - t
q= uniuatrity end a asmttbo it ion Nlftn Odder
of Thu Uniue ft of NK& t v*e
An 5QW tlppoc4rtily/Atrff M ACOM EmPl M
December 9,1999
Jeanette may, DOA SEPA Coordbdttr
ft" cuff"houn
DOp&MM= of Administndon
116 W. Jones St.
Raldsk NC 276OW03
MWt*trw Mft4tkUhCSryIVeW
I , esrrl el"M a hi wWw oetwr
i 9otc t1w
ft%k Nash cw dm Z7r195.M
DilYetor ln&515.4=
>m<tr tlrl Aflsir 11fIMSAN
lndssMW Halos 1119,Slum
no* ad heady 819.Sttit m
Ae6stion Ftoteeflon 91151 uall
Mad At"AM
subject: SCSI Pilo # 00--Pr030-W43, EA IMNST l Ake Raleigh Dredging Pmjeoc
Notch Cnrolins Slue University, Ceammial Cat Wu
RefJlrmm Letter *arn Gloria Patuapt to Jean*& Furney, EA/FOWSI Lasses Raleigh Dredging
Project; Narlh Om china Stare University, Conamnial Csmpos
Wake County, DMM 0 ODE-0043, DWQe12425
Duet Ms. Furncy:
'T'his is is nmponn to the re ed letter on the subject prajeet.
TM univ"sity accepts the mulltioes provided in the referenced loner as the basis for reesiving the
Division of Wafer Quality communes on the EMPONSI.
The University will provide a plan in the 401 Car ficadon to mitigate against the potandal for melon of
elther Ilse purimeesr dikes and spoil piles Also. the University Municipal Sapa j" Stortriwakw Sewer
Syatsm pwmk Gwready under review with DENR will cooWn a commitment for long-team m4k t uaw
atbft oho part onew dikes and piles.
A mised FONSI is enelow4 also as bmucted in the refetbnee lector. The M lowing stsdentdlt was Mded
to dw Findings.
Specifically, the University will prepare a stormwate r mmWane nt plan (meitto noswe
plan) direst d at assnft the long-term iategrity of the perLt dw dikm ad spoil piles.
The plea will be included as a condition of the 401 Cron and may be Ineorporaud
Wm tllr vidvaft m$4 pecmlr.
I bdieve that this meets lire i' Azu of eandMmit eudinad it the refe, cc letter. If faun are arty to UWAi sg
ksnes with dih. pbme let me know.
Knudson
Bn%*MMMW Affairs Manager
&fflusare
DIV WATER QUALITY Fax:[phone] Dec 9 199 1240 P.03
N.CSJJ/ENVR H&S CENTER TEL=919-515-6307 Dec 09'99 13:03 No.010 P.03
pfajda ! SCH Fie d ME-MO-M43. WONSI Lake Raloi`h Drvd&g Vetoes
North Carolina State University. Cantenwai Campus
T1to following is the revised ConcIudow sad 111 r - vntttptdtdions ft M the Lake Ralptglt DfUlging FA
In Af=wnt wi1b the rcc=mcadadm of the apptoroed Envy hftpaat SM=mt fbr NCSU
C.otitmninl COMW end this P.nvkwm=W Asawnm4 the following omiulone and nmm mw&fi=
wounds:
NCSU win Candnct the project in compnma, with pemuks and platy.
NC'SCl will take mitigative measmta sa outlined in this document in agreeatwI with the M, The Phase 1
Mader Plan. Rezoning Conditions and applicable fcdcral, state, and heal viduhs, and standards.
Spaci icslty. the Uttivaa4 will plow a gwmwatsr maaaE"Ot plan (maintenance plan) dltocbed at
usaring the "germ integrity of the pefrctcr d&u and q" piles. The plan aril! be hloluded as t?
condition of ft 441 Cw ifimu n and A? be k orparattd imo the Lhdvrraily MS4 pima.
11* mend= Of Lake Rafth on Cfhst "kj CHt ILI will itEV"IY Afrm $4 smiroomat as 4kno ed
hcxaltt. Any envitommntal amsegLmems of this project will be mtt bM and confined to the m ucdou
Pam.
NO Tst?v{YOlbltMW b t W St:1tEMed la t0 loo mvpwcd for this pmjed. This Finding of No Sigatiamm
Impact CMPWas the mvkwmoMl tevkw record for this project, which is avWilable fOr bgmedm at the
Stile Charing House. NC Depa tum of Administration.
The em buty of this EAIPCNSI< shall be published in lice Rnvimnment a l Bulletin.
DIU WATER QUALITY
Fax:[phone] Dec 9 '99 1239 P.01
Division of Water Ouality
Water Quality Plaming Branch
1617 MAIL SERVICE CENTER
Raleigh, NC 27699-1617
FAX: [phone]
DATE: I
TO: AX NYJMER: 733 -- S``J
FROM-
PHONE NYlMER: [phone] won: S6 D
NO. OF PAGES (t htdi ig this sheet): F-
`11?

DIV WATER QUALITY Fax:[phone] Dec 9 '99 12:18 P.04
NCSU/ENVR H8S CENTER
TEL:[phone]
Dec 09'99 12:45 No.005 P.02
NOM Mohna Sum tk&w" is a WW. quite d Faaaaa tad lit hom
UF&g univarsiiY arts a COI1Salesat if1E atom 3001600 00100
of Tr* univor*fOf AloAh Cantina
M Egad 0PPWfifA*n MftMw E Omer
Dc=mber 9.1994
Jeanette Rormey, DOA SERA Coaed
Btdle ckaringbou"
Depatsaserrt of Adminisasrtien
116 W. Jonee at.
Ralatgb, NC 27603-8003
ht%VWwww2c=eft%x hbsl
ipaah aon" Gem
CMASUM
New North codN VIN& 00f
Cintetor tits. AZIN
&MOMWO ll/tiire 1"11.6156WA
kdlueaw Fbeiaee 818.515,M
Hea>vt and Sefeh 219 tit5,6 M
Aed wm hotacf a 919.li1um
plot) 919.51SAM
Subjea: SCH Isle N 00Z-6030-oo43, EAMONS1 l.aW ROMA DredghS
Project
North CaTdhm state tlnlvcttiity. Centennial campus
Rdfaateo: Letw from Gloria Paz= is AM62e bbtttey. BASONSi Lake Rak*h pndgiog
Project, North Carolina State University, Centennial Cam;M
Woko County, DEM # 40E-0043, nWQ#12483
DearMS. Fumay:
This is is CoMmse to the rd mnc ed loiter an the subject project.
The LfiivM14 accepts the oOnditions provided in the referaarced !sass as do basis for recdvlttg the
Division of Water Quality eoacum4M 0 the EAJF0NSl.
The University will provide a plan in On 401 CelTlfMtion to mitigate against the potential fog oeosion of
oithet $ee poimeter dikes and spoil piles. Abo, the University Municipal Separate 9ttxmwa W SOW&
Syctaes permit, eunently under review with; DfiNR .Kill contain a commitma4 fpr lour twm m bdonanua
of both file perhower dikes mud piles.
A rcAnd FON31 h enclosed, also as instructed in the reference letter. The following stgeat was added
to *10 Flat ftL
Spe cifloolly, the University will prepare a stomwater M med plan (mainttmattoe
plan) directed at asaurbtg the ka*te rm itatev* of the perimeter dikes and spoil piles.
The plan will ba included as a condition of the 441 C alien and may be incorporated
into the University MS.4 p=dL
I bdlavo dmt 11113 meets dm intent of catdkions outlined in the teferertee letter: If there an any reaitaktitgl
trans w4b totft% ploose hi am kttow.
Knudson
Bavtrcomattta) Affairs Mamam
DIV WATER QUALITY Fax:[phone] Dec 9 '99 12:18 P.05
NCSV/ENVR KS CENTER TEL=919-515-6307 Dec 09'99 1245 No.005 P.03
project ; SCH fib 0 00.134 3Q-M3, EAIFONSI Lab Raleigh Dredging Project
North Carom Smu Untvergq, Ceatenntal Campo
The Mowing is ibc revised ConWedom and Recommendations ftm the Lake Raleigh Dredgft fiA
In AVOMM with the recommendations of the approved Fnva+onm=W Imp= Stwmemt for NC$V
Centennial Campus and fti 1siiili wmcntal Asamment. ibe following com*stens and rccummamdadoma
are made:
NCSU will conduct the project in mgfl xace with permits end plan,.
WCSU w111 tiller mitigative meammI m outlined in ibis doeumant is agmmmt w16 ibe LqS, Zlta Phase 1
Memer plan, Rczming ConditimB and applicable fcdcmL stab and local datufts. and sm?dards.
Specifically, the UnivcWq will prepare a stonhwater man gement plan (maint anam plan) ditoctM at
S$sMnz the lm4-term integrity of the pwimeter dAm and spoil piles. 'The pram will be itmbAW ma
ocndidan of tiro 401 Ca i cation and will b incorporated inro tho university Mad permit.
MW *eviQtaotlOn of Lake RAU4h 00 Cmamial Campus will ncg tlvely a$ect the envlro new ea dinvued
herein. Any envir+ommas4tl consequences of this p vject will be minimal ad confined to the conffmgtim
process.
N4 A*vkOSmeatat 1mpaet t;;tatemMt ii tb be prepared for this p 0ccL This Finding of No Siofi cad
lnnpeet oomplem the envb ntnenial roview record Tor ibis project, which is available i br ieep4gdpa u t e
tihata Clearing Hbusb. NC DepwAma t of AdministrMan.
Mw summary of this EAAzONSl shall be pubtishud in des Auvimnmenml Builotin,
DIV WATER QUALITY Fax:[phone] Dec 9 199 12:17 P.02
f '
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
Sri
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
December 7.1999
MEMORANDUM
To. Jeanette Furney, DOA SEPA Coordinator
From: Gloria Putnam, DWQ SEPA Coordinator
Subject: EA/PONSI Lake Raleigh Dredging Project
North Carolina State University, Centennial Campus
wake county
DENR # 00E-0043, DWQ# 12495
Over the last two months, the Division of Water Quality (Division) has been corresponding with
North Carolina State University (NCSU) regarding our August 30,1999 comments on the
Environmental Assessment (EA) for the Lake Raleigh Dredging Project on North Carolina State
University's Centennial Campus in Wake County. The Division is satisfied that NCSU has
provided information that addresses most of our concerns as outlined in our August 30P letter.
However, the Division's concerns regarding erosion of the spoil materials placed in the 100-year
flood plain still remain.
As NCSU states in their November 22, 1999 response letter, the most recent hydraulic evaluation
of the project shows that floodwaters will contact the spoil piles and/or the perimetez dikes on a
fairly frequent basis. For example, floodwaters are predicted to reach the toe of the perimeter
dike on the right side of Walnut Creek at least every two years and the dike is estimated to be
overtopped every five years. The Division believes these modeling results support our concerns
that there is a potential for significant erosion of the spoil piles. As the Division indicated to
NCSU' in a November 10, 1999 electronic message, Walnut Creek is currently on the state's
303(d) list of impaired waters due to sedimentation, making the issue of the potential for
additional sediment loading a concern. 't'herefore, erosion prevention of the spoil piles is of
major import to the Division.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10°/6 post-consumer paper
DIV WATER QUALITY Fax:[phone] Dec 9 199 12:17 P.03
NCSU Lake Raleigh Dredging
Page 2,12/6/99
The Division and NCSU agree that for effective sediment control, the following items must be
addressed: design of the perimeter dikes; rapid establishment of vegetation of the dike and spoil
materials, and ongoing maintenance of these areas, including frequent inspection to assess
damage due to storms and human activity and prompt repair of any damage. It is also
understood, based on NCSU's November 22, 1999 letter, that both parties agree that either or
both the project's 401 Water Quality Certification or Centennial Campus's NPDES Stormwater
Permit can be utilized to address the long-term maintenance concerns.
Although the Division has reviewed NCSU's August 31, 1999 Sediment and Erosion Control
Plan (SECP) for this project, comments are not being offered at this time. The Division's 401
Wetlands Unit will however review this plait during the 401 Certification process. It is
recommended that NCSU coordinate with the Division's 401 Wetlands Unit on the 401
Certification prior to submitting their SECP application to the Division of Land Resources. That
way, NCSU can incorporate design features or conditions that may be necessary for the 401
Certification into the SECP at an early stage.
Although the Division encourages the University to take steps to limit hurn= activity on the
dikes and on the sloping areas, it is understood from review of the SECP, that NCSU plans to use
the perimeter dikes/earthen berms as part of the roadway system for Centennial Campus. - If
NCSU in fact plans to construct roads on or across the spoil materials, NCSU needs to be aware
that the proposals will be subject to the Neuse Buffer Rules.
The Division concurs with the BA/FONSI if NCSU agrees, as a mitigative measure for this
project, to prepare a stormwater management plan (maintenance plan) directed at assuring the
long-term integrity of the perimeter dike and spoil piles. The plan would be submitted to and
agreed upon by the Division of Water Quality, and would be included as a condition in either or
both the 401 Certification or the campus's NPDES Stormwater Permit. The Division also
requests that this mitigative measure be identified as such in the FONSI for this project.
If you should have any questions concerning these comments, please call me at 919-733-5083,
ext. 567.
cc: Duane Knudson, NCSU
John Dorney, 401 Wetlands Unit
Jinn Blose, DWQ Modeling Unit
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary
Kerr T. Stevens, Director
December 6, 1!
MEMORANDUM
To: Jeanette Furney
DOA SEPA Coordinator
From: Gloria Putnam
DWQ SEPA Coordinator
Subject:
EA/FONSI Lake Raleigh Dredging
North Carolina State University, Centennial Campus
Wake County
DENR # OOE-0043, DWQ# 12485
Over the last two months, the Division of Water Quality (Division) has been
corresponding with North Carolina State University (NCSU) regarding our August 30,
1999 comments on the Environmental Assessment (EA) for the Lake Raleigh Dredging
Project on North Carolina State University's Centennial Campus in Wake County. The
Division is satisfied that NCSU has provided information that addresses most of our
concerns as outlined in our August 30t' letter. However, the Division's concerns
regarding erosion of the spoil materials placed in the 100-year flood plain still remain.
As NCSU states in their November 22, 1999 response letter, the most recent hydraulic
evaluation of the project shows that floodwaters will contact the spoil piles and/or the-
perimeter dikes on a fairly frequent basis. For example, floodwaters are predicted to
reach the toe of the perimeter dike on the right side of Walnut Creek at least every two
years and the dike is estimated to be overtopped every five years. The Division believes
these modeling results support our concerns that there is a potential for significant erosion
of the spoil piles. As the Division indicated to NCSU in a November 10, 1999 electronic
message, Walnut Creek is currently on the state's 303(d) list of impaired waters due to
sedimentation, making the water body sensitive to additional sediment loading.
Therefore the erosion prevention of the spoil piles is of major import to the Division.
Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
Equal opportunity Affirmative Action Employer 50% recycled/ 10% post-consumer paper

The Division and NCSU agree that for effective sediment control, the following items
must be addressed: design of the perimeter dikes, rapid establishment of vegetation of the
dike and spoil materials, and ongoing maintenance of these units. Frequent inspection
will be necessary to assess damage due to storms and human activity, and prompt repair
of any damage will be necessary. It is also understood, based on NCSU's November 22,
1999 letter, that both parties agree that either or both the project's 401 Water Quality
Certification or Centennial Campus's NPDES Stormwater Permit can be utilized to
address the long-term maintenance concerns. It is recommended that NCSU contact the
Division's 401 Wetlands Unit to discuss the 401 Water Quality Certification prior so the
Sediment and Erosion Control Plan application that is ultimately submitted to the
Division of Land Resources contains design features that may be necessary for the 401
Certification. Although the Division has reviewed NCSU's August 31, 1999 Sediment
and Erosion Control Plan (SECP) for this project, is not offering comments during the
EA process. However, the plan is being forwarded to the Wetlands Unit for their use
during the 401 Certification process.
Although the Division encourages the University to take steps to limit human activity on
the dikes and on the sloping areas, it is understood from review of the SECP, that NCSU
plans to use the perimeter dikes/earthen berms as part of the roadway system for
Centennial Campus. This planned use is contradictory to that previously identified
verbally by NCSU. However, if NCSU in fact plans to construct roads on or across the
spoil materials, it needs to be aware that the proposals will be subject to the Neuse Buffer
Rules.
The Division could concur with the EA/FONSI if NCSU agrees, as a mitigative measure
for this project, to prepare a stormwater management plan (maintenance plan) directed at
assuring the long-term integrity of the perimeter dike and spoil piles. The plan would be
submitted to and agreed upon by the Division of Water Quality, and which would be
included as a condition in either or both the 401 Certification or the campus's NPDES
Stormwater Permit. The Division also requests that this mitigative measure be identified
as part of the FONSI for the project.
If you should have any questions concerning these comments, please call me at 919-733-
5083, ext. 567.
Page
State of North Carolina
Department of Environment
and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Bill Holman, Secretary Kerr T. Stevens, Director NCDENR
December 7, 19991
MEMORANDUM
To: Jeanette Furney, DOA SEPA Coordinator ?.:.:
From: Gloria Putnam, DWQ SEPA Coordinator
Subject: EA/FONSI Lake Raleigh Dredging Project
North Carolina State University, Centennial Campus
Wake County
DENR # OOE-0043, DWQ# 12485
Over the last two months, the Division of Water Quality (Division) has been corresponding with
North Carolina State University (NCSU) regarding our August 30, 1999 comments on the
Environmental Assessment (EA) for the Lake Raleigh Dredging Project on North Carolina State
University's Centennial Campus in Wake County. The Division is satisfied that NCSU has
provided information that addresses most of our concerns as outlined in our August 30' letter.
However, the Division's concerns regarding erosion of the spoil materials placed in the 100-year
flood plain still remain.
As NCSU states in their November 22, 1999 response letter, the most recent hydraulic evaluation
of the project shows that floodwaters will contact the spoil piles and/or the perimeter dikes on a
fairly frequent basis. For example, floodwaters are predicted to reach the toe of the perimeter
dike on the right side of Walnut Creek at least every two years and the dike is estimated to be
overtopped every five years. The Division believes these modeling results support our concerns
that there is a potential for significant erosion of the spoil piles. As the Division indicated to
NCSU in a November 10, 1999 electronic message, Walnut Creek is currently on the state's
303(d) list of impaired waters due to sedimentation, making the issue of the potential for
additional sediment loading a concern. Therefore, erosion prevention of the spoil piles is of
major import to the Division.
1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/ 10% post-consumer paper
"C'StJ I..,ikc I2aleisxh IJrtd<,in
Rjg,c 12/6/99
The Division and NCSU agree that for effective sediment control, the following items must be
addressed: design of the perimeter dikes; rapid establishment of vegetation of the dike and spoil
materials; and ongoing maintenance of these areas, including frequent inspection to assess
damage due to storms and human activity and prompt repair of any damage. It is also
understood, based on NCSU's November 22, 1999 letter, that both parties agree that either or
both the project's 401 Water Quality Certification or Centennial Campus's NPDES Stormwater
Permit can be utilized to address the long-term maintenance concerns.
Although the Division has reviewed NCSU's August 31, 1999 Sediment and Erosion Control
Plan (SECP) for this project, comments are not being offered at this time. The Division's 401
Wetlands Unit will however review this plan during the 401 Certification process. It is
recommended that NCSU coordinate with the Division's 401 Wetlands Unit on the 401
Certification prior to submitting their SECP application to the Division of Land Resources. That
way, NCSU can incorporate design features or conditions that may be necessary for the 401
Certification into the SECP at an early stage.
Although the Division encourages the University to take steps to limit human activity on the
dikes and on the sloping areas, it is understood from review of the SECP, that NCSU plans to use
the perimeter dikes/earthen berms as part of the roadway system for Centennial Campus. If
NCSU in fact plans to construct roads on or across the spoil materials, NCSU needs to be aware
that the proposals will be subject to the Neuse Buffer Rules.
The Division concurs with the EA/FONSI if NCSU agrees, as a mitigative measure for this
project, to prepare a stormwater management plan (maintenance plan) directed at assuring the
long-term integrity of the perimeter dike and spoil piles. The plan would be submitted to and
agreed upon by the Division of Water Quality, and would be included as a condition in either or
both the 401 Certification or the campus's NPDES Stormwater Permit. The Division also
requests that this mitigative measure be identified as such in the FONSI for this project.
If you should have any questions concerning these comments, please call me at 919-733-5083,
ext. 567.
cc: Duane Knudson, NCSU
Jim Blose, DWQ Modeling Unit

i
i
North Carolina State University
SUPPLEMENTAL INFORMATION
DISPOSAL AREA EROSION CONTROL
Lake Raleigh Sediment Removal Project
Raleigh, North Carolina
October 25, 1999
AG&E Project Number NCSU 1074
I???l ?'?l Vl
APPLIED GEOSCIENCES
AND ENGINEERING
405-A Parkway Drive, Greensboro, North Carolina 27401-1693
Phone [phone]; Fax [phone]
u

North Carolina State University

0
n
L

r

n

I
SUPPLEMENTAL INFORMATION
DISPOSAL AREA EROSION CONTROL
Lake Raleigh Sediment Removal Project
Raleigh, North Carolina
0
October 25, 1999
AG&E Project Number NCSU 1074
WAMOM90
APPLIED GEOSCIENCES
AND ENGINEERING
405-A Parkway Drive, Greensboro, North Carolina 27401-1693
Phone [phone]; Fax [phone]

I
' North Carolina State University
SUPPLEMENTAL INFORMATION
DISPOSAL AREA EROSION CONTROL
' Lake Raleigh Sediment Removal Project
'
TABLE OF CONTENTS
' INTRODUCTION ................................................................................................................ Page 1
DISPOSAL AREA ................................................................................................................ Page 1
' HYDROLOGY AND HYDRAULICS ................................................................................. Page 1
SPECIAL EROSION CONTROL FEATURES ................................................................... Page 2
' EROSION AND SEDIMENT CONTROL PLAN ............................................................... Page 3
TRIBUTARY STREAMS .................................................................................................... Page 4
' SUMMARY .......................................................................................................................... Page 4

ATTACHMENTS

J

H
Attachment 1 Hydraulic Evaluation
Attachment 2 Disposal Area Erosion Control - Flow Velocities
Attachment 3 Photographs of Tributary Stream - South of Disposal Area 2
DRAWINGS
Plate 1 Site Map
Plate 2 Disposal Site Map
Plate 3 Disposal Area Cross. Sections and Typical Details
FILE. IIFILESERVERIFILESIPROJEC7'SI1074NCSUIEROSION & SEDIMENT CONTROL PLANDISPOSAL AREA EROSION CONTROL 10-25-
99.DOC
October 26, 1999 1

' LAKE RALEIGH SEDIMENT REMOVAL PROJECT
SUPPLEMENTAL INFORMATION
' DISPOSAL AREA EROSION CONTROL
' Introduction
This report supplements the Erosion and Sediment Control Plan for the lake Raleigh Sediment
' Removal Project. The purpose of this report is to provide a discussion on sediment erosion control,
with supporting data, for the plans to place Lake Raleigh sediments in a disposal area downstream
of the dam. The report provides information that documents the sediments will be placed, shaped,
and maintained in a manner that will minimize any potential for erosion during and following
construction activities, including storm events.
Disposal Area

L

u
I I
n

The area designated for disposal of the sediments is located downstream from the Lake Raleigh Dam
in the floodplain of Walnut Creek. The area has been divided into four sub-areas due to existing
wetlands, electricity transmission towers, perimeter channel design, and to limit the required size of
sediment basins. Two of the disposal areas are located adjacent to the published floodway north of
Walnut Creek, and two of the disposal areas are located adjacent to the published floodway south
of Walnut Creek. The anticipated maximum depth of sediment disposed in each area will be
approximately 7 feet. Each disposal area will have a perimeter channel ditch and containment dike
to direct runoff to a sediment basin that will discharge water onto the existing ground surface of the
floodplain via a level spreader prior to reaching the riparian area boundary. The shaped sediment
piles, and the perimeter ditches and dikes will be seeded and mulched to establish a protective cover.
A sediment fence will be located outside of the ditch/dike system during construction and until a
vegetative cover is established.
Hydrology and Hydraulics
The four disposal areas have been designed to be contained outside the wetlands, floodway
boundary, and Neuse River riparian area. A sediment basin will be provided for each of the four
basins. The drainage area for each basin includes the top and slopes of the placed sediments, the
perimeter channel and dike.
The hydrologic and hydraulic design of the sediment basins in the disposal area has been discussed
with John Holley, Department of Environment and Natural Resources (DENR). The following
design details have been agreed upon that will be used to meet the requirements of the Neuse River
Riparian areas along the Walnut Creek and tributary streams.
1. The storage volume of 1800 cubic feet per acre may be contained in a partially or fully excavated
basin.

? 3.

The flow through the basin spillway will be kept very shallow (6 inches depth) and discharged
onto a level pad with a minimum overfall (0.5 feet) from spillway crest to the level area.
The flows will be spread by level lip spreaders or rock riprap level pads prior to reaching the
riparian area boundary.
Because of the very flat topography in the four disposal areas, the design will include the
following concepts:
• an excavated pond with the required storage volume below the ground surface, and with the
inlet channel (perimeter channel) bottom at natural ground level, except that the perimeter
channel will be excavated where required to provide positive drainage,
• an emergency spillway with crest elevation set only 0.5 feet above natural ground,
• a level rock riprap pad surface set at natural ground grade and designed in accordance with
Natural Resources Conservation Service (NRCS) or DENR guidelines.
• containment dikes on the sides of the level pad.
The data used in the hydraulic evaluation of the impacts of the placement of the dredged material
as shown in the plan view were derived from several sources. The primary source of information
for the analysis was the FEMA HEC-2 Analysis of Walnut Creek. This model was obtained from
FEMA and was revised as a part of the Lake Raleigh Dam Restoration project. This analysis
contained cross sections immediately upstream and downstream of the proposed disposal areas as
well as 6 cross sections within that area. The results are shown in Attachment 1.
The analysis shows that the sediment fill has a very small impact on the level of flooding and the
velocity in the channel within the disposal area. For the 100-year event, the flooding elevation
changes vary from +0.3 to +0.7 of a foot and the change in velocity varies from -0.4 to + 1.3 fps at
the cross sections shown, beginning at the downstream end of the sediment disposal area and
continuing upstream. The placement of sediment fill in the designated areas will not cause any
measurable additional flooding downstream of the disposal area, as shown in attachment 1.
The study shows that the overland velocities of the floodwaters adjacent to the small perimeter dike
and the sediment pile slopes do not exceed 1.9 fps. These velocities are considered very low for
vegetated soils and should cause little or no soil erosion for storms up to the 100-year event. The
velocities for the 10-year, 50-year, and 100-year storm events at various locations in the disposal
area are tabulated in Attachment 2. The storm water elevations and velocities at selected cross
sections are summarized in the table on Plate No. 2. The velocities adjacent to the shaped sediment
piles vary from 0.6 to 1.6 fps for the 10-year storm, 0.7 to 1.8 fps for the 50-year storm and 0.8 to
1.9 fps for the 100-year storm.
Special Erosion Control Features
The following are special design features to stabilize the sediments and minimize potential
erosion:
• Perimeter Channel/Ditch and Containment Dike. The perimeter channel/ditch and containment
dike serves to direct runoff from the disposed sediment into the sediment basin. The runoff will

r
' flow over a combination of the existing ground profile, with some areas being cut and filled for
positive drainage toward the sediment basin. The runoff will be detained before passing through
' the sediment basin spillway and onto a level rock riprap apron.
• Weir control. Each sediment basin spillway will include a wooden weir to provide a uniform
' discharge of water onto the level rock riprap apron. A second wooden weir will be placed at the
end of the apron to provide uniform shallow flow onto the natural vegetation.
' • Level Rock Riprap Apron. The storm flows will be spread on the level rock riprap apron before
being discharged onto the natural vegetated ground.
' • Sediment Fences. Temporary sediment fences (silt fences) consisting of filter fabric buried at
the bottom, stretched, and supported by posts will be installed along the haul roads and around
the sediment disposal sub-areas with the fence located outside of the perimeter channel/ditch and
' containment dike system.
' • Earthen Berms. Earthfill berms will be constructed in certain locations for three of the four
disposal sub-areas to become part of the proposed roadway system for NCSU's Centennial
Campus, which will be constructed at a later date. The sediment will be placed against the berm
in these areas. The earthfill will be placed in accordance with roadway design specifications
provided by Ballentine Associates. The locations of these berms are shown on attached Plate No.
2.
' • Sediment Embankment Toe Support and filter. The vegetation stripped from the surface within
the basin of Lake Raleigh will be placed as a windrow of excavated grasses and root mat about
' two feet high at the toe of the planned sediment slope prior to placing sediments. The purpose
would be to act as a toe support, natural filter, rapid vegetation area, and slope protection for the
channel slope.
' • Maintenance of Perimeter Channel/Ditch System. Each perimeter system will be inspected after
' each period of significant rainfall. Sediment will be removed and the ditch restored to its
original dimensions when the sediment has accumulated to one-third the available depth.
' • Permanent Seeding. Permanent seeding of all disposal areas will be provided immediately after
constructing the slopes of the sediment and smoothing the top of each section of each sediment
embankment. All features, including ditches/dikes and sediment basins will be seeded upon
' completion of each sub-area.
' Erosion and Sediment Control Plan
An erosion and sediment control plan, including the design computations and detailed construction
' drawings, has been developed. This plan will be finalized and processed with DENR for approval
after the Environmental Assessment approval is received.
3

Tributary Streams
' No construction is planned that would disturb the riparian areas of the side tributary streams that
enter Walnut Creek. A field review was made on October 20, 1999 by walking the full length of the
stream south of disposal area No. 2. The stream banks are heavily vegetated as shown in the
' photographs in Attachment 3. At least two beaver dams were observed and areas adjacent to the
stream include a full cover of marsh grasses. The stream banks where the stream makes 90-degree
bends should remain stable if left undisturbed and will not encroach into the planned disposal area.

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Summary
The attachment No. 2 and the table on Plate 2 shows that the floodwater velocities adjacent to the
sediments placed in the disposal area do not exceed 1.9 feet per second (fps) for the 100-year storm
event. These velocities are considered non-erosive velocities, especially considering the toe support
planned for the placement of the sediments in the disposal area. The toe support consists of a
windrow of excavated grasses and root mat placed before the first deposit of sediments.
A field examination confirms the tributary streams in the disposal area have stable banks and if left
undisturbed would not encroach into any part of the disposal areas.
4
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ATTACHMENT 1
HYDRAULIC EVALUATION
C
' LAKE RALEIGH SEDIMENT REMOVAL PROJECT
HYDRAULIC EVALUATION
' The data used in the hydraulic evaluation of the impacts of the placement the dredged
material as shown in the plan view were derived from several sources. The primary
source of information for the analysis was the FEMA HEC-2 Analysis of Walnut Creek.
This model was obtained from FEMA and was revised as a part of the Lake Raleigh Dam
Restoration project. This analysis contained cross sections immediately upstream and
downstream of the proposed disposal areas as well as 6 cross sections within that area.
The FEMA analysis was revised using updated topographic data from the Wake County
' GIS at a 2 foot contour interval and was additionally supplemented by survey data by
Ballentine Associates and provided at a 1 foot contour interval. The composite map is
enclosed and shows the approximate location of the disposal areas as shown in the Permit
' Application. These three sets of data were blended into composite cross sections to be
used to reflect the existing field conditions. The placement of the fill material was
represented as a vertical change in the ground profile at the point where the cross section
' intersected the designated disposal area. The fill area was assumed to have a sloped top
and did not follow the natural ground contours. Plots of the cross sections are attached.
The station reference is based on the distance in feet from the mouth of Walnut Creek and
' agrees with the FEMA stationing. The cross section just downstream of the disposal
area is section 55985 and the cross section just upstream of the disposal area is station
57870.
' The summary tables show that the impact of the sediment fill has a varying impact on the
level of flooding and the velocity in the channel within the disposal area. For the 100-
year event, the flooding elevation changes vary from +0.3 to +0.7 of a foot and the
change in velocity varies from -0.4 to + 1.3 fps at the cross sections shown, beginning at
the downstream end of the sediment disposal area and continuing upstream. The
' placement of sediment fill in the designated areas will not cause any measurable
additional flooding downstream of the disposal area, as shown by cross section 55985.

r
I

UILESERVERTILESTrojectAl074ncsu\Erosion & Sediment Control P1anWTTACHMEW 1 Hydraulic Eval Page Ldoc
October 26, 1999

Date
Project
Subject
5/16/99
1074 Lake Raleigh Sediment Removal
Checked
HEC-2 File for Existing Conditions
HEC-2 File for Proposed Conditions
Station Existing Proposed Existing Proposed
In feet from Condition Condition Condition Condition
Mouth of Computed Computed Change in Computed Computed Change in
Walnut Ck. Event WSEL WSEL WSE Velocity Velocity Velocity
ft ft ft fps fps fps
5598510-Year 257.07 257.07 0.00 8.50 8.50 0.00
50-Year 258.12 258.12 0.00 9.60 9.60 0.00
100-Year 258.59 258.59 0.00 9.91 9.91 0.00
500-Year 259.58 259.58 0.00 10.07 10.07 0.00
5631510-Year 258.33 258.55 0.22 2.70 3.48 0.78
50-Year 259.36 259.65 0.29 2.83 3.92 1.09
100-Year 259.80 260.12 0.32 2.95 4.17 1.22
500-Year 260.70 261.03 0.33 3.15 4.56 1.41
5683510-Year 258.97 259.36 0.39 3.90 3.73 -0.17
50-Year 259.95 260.51 0.56 4.14 4.25 0.11
100-Year 260.39 261.01 0.62 4.23 4.49 0.26
500-Year 261.28 261.98 0.70 4.34 4.98 0.64
5743510-Year 260.26 260.51 0.25 4.19 4.17 -0.02
50-Year 261.17 261.69 0.52 4.39 4.58 0.19
100-Year 261.56 262.22 0.66 4.44 4.79 0.35
500-Year 262.35 263.23 0.88 4.51 5.12 0.61
5763510-Year 260.67 260.90 0.23 4.29 4.10 -0.19
50-Year 261.56 262.08 0.52 5.47 5.09 -0.38
100-Year 261.94 262.61 0.67 5.91 5.48 -0.43
500-Year 262.71 263.61 0.90 6.46 6.26 -0.20
5775010-Year 250.89 261.05 0.16 7.27 7.29 0.02
50-Year 261.87 262.23 0.36 8.63 8.84 0.21
100-Year 262.28 262.76 0.48 9.04 9.46 0.42
500-Year 263.05 263.79 0.74 9.75 10.47 0.72
Results1.xis Summary
1 of 2
2:21 PM 5/17/99

Date
Project
Subject
5/16/99
4 Lake Raleigh Sediment Removal
sediment
Checked
HEC-2 File for Existing Conditions
HEC-2 File for Proposed Conditions
Station Existing Proposed Existing Proposed
In feet from Condition Condition Condition Condition
Mouth of Computed Computed Change in Computed Computed Change in
Walnut Ck. Event WSEL WSEL WSE Velocity Velocity Velocity
ft ft ft fps fps fps
5780010-Year 261.46 261.55 0.09 5.16 6.25 1.09
50-Year 262.51 262.83 0.32 6.09 7.53 1.44
100-Year 262.90 263.41 0.51 6.67 8.00 1.33
500-Year 263.60 264.48 0.88 7.82 8.81 0.99
5787010-Year 261.05 261.49 0.44 9.75 9.04 -0.71
50-Year 262.23 262.26 0.03 13.89 13.83 -0.06
100-Year 264.02 264.06 0.04 12.63 12.54 -0.09
500-Year 265.45 265.48 0.03 13.80 13.71 -0.09
Results1.xls Summary
2 of 2
2:21 PM 5/17/99
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Date 5/16/99
Project 1074 Lake F
Subject Cross Sectii
Data Source:
Checked
Approved CLOMR HEC-2 Analysis for Lake Raleigh Dam
Survey Data from Ballantine Associates and Wake County Topographic Map
Wake County Topographic Data
XS 55985
272
270
268
266
264
262
260
258
256
254
252
250
248
246
0 100 200 300 400 500 600
:
i-Existing
I
700 800 900
272
270
268
266
264
262
260
258
256
254
252
used to assess the impact of the sediment
XS 56315

250 .
0 200
Cross Sections.xls Plots
Sediment Removal
400 600 800 1000 1200 1400 1600 1800
- - - -Existing Proposed 1
1 of 4 4:42 PM 5/17/99
r
Date 5/16/99 W.rG
Project 1074 Lake Raleigh Sediment Removal
Subject Cross Sections used to assess the impact of the sediment placement
By JHM Checked
Data Source:
Approved CLOMR HEC-2 Analysis for Lake Raleigh Dam
Survey Data from Ballantine Associates and Wake County Topographic Map
Wake County Topographic Data
272
270
268
266
264
262
260
;
258
256
254
252
250
XS 56835
0 200 400 600 800 1000 1200 1400
- - - • Existing Proposed I
i
j 272
270
268
266
j 264
262
260
258
256
254
252
XS 57435
1600 1800
2000

250
0
500 1000 1500
- -Existing Proposed
2000 2500
Cross Sections.xls Plots
2 of 4
4:42 PM 5/17199
i
Date 5/16/99 ?r0(?,
Project 1074 Lake Raleigh Sediment Removal
Subject Cross Sections used to assess the impact of the sediment placement
By JHM Checked
Data Source:
Approved CLOMR HEC-2 Analysis for Lake Raleigh Dam
Survey Data from Ballantine Associates and Wake County Topographic Map
Wake County Topographic Data
272
270
268
266
264
262
260
258
256
254
252
250
XS 57635

0 500 1000 1500 2000 2500
- - - • Existing Proposed
272
270
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256
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250
XS 57750

1 0
200 400 600 800
- - - 'Existing Proposed
1000 1200
Cross Sections.xis Plots
3 of 4
4:42 PM 5117199
r
Date 5/16/99 AVA(IV>
Project 1074 Lake Raleigh Sediment Removal
Subject Cross Sections used to assess the impact of the sediment placement
By JHM Checked
Data Source:
Approved CLOMR HEC-2 Analysis for Lake Raleigh Dam
Survey Data from Ballantine Associates and Wake County Topographic Map
Wake County Topographic Data
XS 57800
272
270
268
266
264
262
260
258
256
254
252
250

0 100 200 300 400 500 600 700 800 900 1000
i
!- - - -Existing Proposed
i
272
270
268
266
264
262
260
258
i 256
254
252
250
XS 57870
0 100 200 300 400 500
Existing
Cross Sections.xis Plots 4 of 4
600 700 800 900
i
4:42 PM 5/17/99
1
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7
ATTACHMENT 2
DISPOSAL AREA EROSION CONTROL
FLOW VELOCITIES

' ATTACHMENT 2
DISPOSAL AREA EROSION CONTROL
FLOW VELOCITIES
Attachment 2 includes the following data:
' One map showing the original and revised disposal area layouts. The hydraulic analysis
was based on the original layout. Since the revised layout is smaller than the original and
the fill areas are only barely overtopped in a couple of areas, the original layout would
' produce slightly higher velocities than the final layout.
Three Excel spreadsheets showing the existing and proposed cross sections based on the
' original disposal layout.
Nine pages of excerpts from the HEC-2 Analysis. This analysis includes the revised
' cross sections as shown in the spreadsheet plots and also includes the data provided with
the CLOMR. The data is grouped by event (10, 50, and 100 year storms) and works it's
way up stream from the cross section immediately below of the disposal area. The
relevant data has been circled.

\\FILESERVER\FILES\Projects\1074ncsu\Erosion & Sediment Control Plan\ATTACHMENT 2 for Supplemental Report 1-25-99.doc
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Date 10/20/99
Project 1074 Lake F
Subject Cross Sectic
By JHM Checked
Data Source: C ?^U S S Sti raw ?-? O-r-.
Approved CLOMR HEC-2 Analysis for Lake Raleigh Dam Qom?,,--
Survey Data from Ballantine Associates and Wake County Topographic Map u? cT typo. -0,
Wake County Topographic Data
igh Sediment Removal
used to assess the imr
XS 55985
272
270
268
266
264
262
260
258

256
254
252
250

248
246
0 100 200 300 400 500 600 700 800 900
Existing

XS 56315
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0 200 400 600 800 1000 1200 1400 1600 1800
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Cross Sections 2.xis Plots
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11:17 AM 10125/99
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Date 10/20/99 rProject 1074 Lake Raleigh Sediment Removal raVIN-04 Subj
ect Cross Sections used to assess the impact of the sediment placement
By JHM Checked
Data Source:
Approved CLOMR HEC-2 Analysis for Lake Raleigh Dam
Survey Data from Ballantine Associates and Wake County Topographic Map
Wake County Topographic Data
272
270
268
266
264
262
260
258
256
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0 200 400 600 800 1000 1200 1400 1600 1800 2000
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272
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0 500 1000 1500 2000 2500
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Cross Sections 2.xls Plots
2of3
11:17 AM 10/25/99
i
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Date 10/20/99 AVA[OM
Project 1074 Lake Raleigh Sediment Removal IN-M',
Subject Cross Sections used to assess the impact of the sediment placement
By JHM Checked
Data Source:
Approved CLOMR HEC-2 Analysis for Lake Raleigh Dam
Survey Data from Ballantine Associates and Wake County Topographic Map
Wake County Topographic Data
XS 57635
272
270
268
266
264
262
260
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256 i
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ATTACHMENT 3
PHOTOGRAPHS OF TRIBUTARY STREAM
SOUTH OF DISPOSAL AREA 2
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P1. View of tributary stream, looking downstream. Beaver dams are ponding water. See
Plate 2 for location.
P2. View of tributary stream, looking upstream. Note beaver dam in center of photo.
See Plate 2 for location.
i

P3. View of tributary stream. See Plate 2 for location.
P4. View of tributary stream. See Plate 2 for location.

i

-`

P6. View of tributary stream near transmission tower right-of-way. See Plate 2 for location.
P5. View of tributary stream.
Note heavy growth of grasses and
trees in shallow water and pine
trees along edge of water. See
Plate 2 for location.
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Fax Massage From:
Dec 3 '99 1512
Name: DIV WATER QUALITY
Fax Number: 9197155637
NCDENR - DIV OF WATER Planning Branch
DIV WATER QUALITY Fax:[phone] Dec 6 'yy 15:11 r.ui
?? wrr,w•rrrrrr?•.rr-.w?wr•?wwww?uwnis?rprwwri??unw???rr_?wr??iriwrrrr??.r .•
Division of Water, Quality
Water Quality Planning Branch
1617 MAIL SERVICE CENTER
Raleigh, NC 27699-1617
FAX: [phone]
DATE: /,A ?-
TO: AX NUMBER: 7 3 3 ` 995
PHONE NUMBER: [phone] extension: s-b
NO.OF PAGES owtuding this sheet): 3
COMMENTS:
i
a - - mnmu i n ? iu ¦ i o???wr Y•innnli -.__ ??•
DIV WATER QUALITY Fax:[phone] Dec 6 '99 15:11 r.uz
North Carolina State University is a land-
grant university and a constituent institution
of The University of North Carolina
015ce of Rumse and Business
Business Divislen
An Equal Oppornmity/Affirmative Action Employer
http:IMromLncsu.edu/ncsu/ehs/
November 22, 1999
Gloria Putnam, SEPA Coordinator
Division of Water Quality
North Carolina Department of Environment and Natural Resources
P.O. Box 29535
Raleigh, NC 27626-0535
En*aamantal Health a $afettr Car*
Campus Box 8007
Raleigh, North Carolina 276958007
Director • . 919.515.4238
Emironmertal Affairs s19.515.6859
lndustriai Hygiene 9191515.6860
Health and Safety 919.515.6858
Radiation Protection 919.515.2894
(Fax) 919.515.6307
Reference: Environmental Assessment and Finding of No Significant Impact, Lake Raleigh
Dredging Project, North Carolina State University, Centennial Campus. July 23, 1999.
Letter from Duane Knudson to Gloria Pumm, November 3, 1999,
Dear Ms. Putnam:
The enclosed supplements and clarifies the additional information provided with my November 3, 1999.
letter to you addressing Division of Water Quality (DWQ) concerns on the referenced Environmental
Assessment (EA). It is my understanding that the previously submitted material did not adequately address
the actual floodwater depth and frequency of contact of Walnut Creek flood water on the perimeter dies'
- and the spoil piles. Also, I was in error in presenting model predictions for water depth.
In my November 3 letter, I misinterpreted the modeling results provided by AG&E in the report entitled,
"Supplemental Information, Disposal Area Erosion Control, Lake Raleigh Sediment Removal Project,
Raleigh, North Carolina." The floodwater modeling provided in that report indicated that the maximum
water level change at the edge of the piles, relative to absence of the piles, for the I, 00-year storm is less
than 9 inches. This value was incorrectly reported by me as the total water depth. The correct value for
depth of flooding at the perimeter dike for the 100-year event varies from 1.0 to 4.1 feet.
On the subject of frequency of contact, worst case modeling results indicate that the water levels will
exceed the top of the perimeter dike not more frequently than once in 40 years on the left side of Walnut
Creek and not more than once in 5 years on the right side. The return period for floodwater depth to reach
the toe of the perimeter dike on the right side of Walnut Crwk is less that 2 years at any point.
The flow rate of floodwater past the piles, and the potential for pile erosion, was also a concern expressed
by DWQ and has not changed in the recent modeling or interpretation. The maximum flow rate at the point
of contact to the pile (100-year storm) was computed to be 1.9 feet/second (fps). Comparing this model-
predicted maximum flow rate to established allowable design velocities from the NCDENR, Division of
Land Quality, Erosion and Sediment Control Planning and Design Manual (Table 8.05x) for vegetated
channels, provides a clear indication of the lack of potential for erosion of the grassed dikes and piles.
Maximum allowable design velocities for vegetated channels with a slope of greater than 10% for grasses
in clay-mix soil ranges from 3.5 to 4.5 fps. Therefore, the maximum impact value for the 100-year'storm
of 1.9 fps is well below the maximum allowable design value for direct contact from flowing water.
' DIV WATER QUALITY Fax:[phone]
Gloria Putnam
NTOvember 22, 1999
Page 2
Dec S 'yy 1??1J r.uJ
Although floodwater will contact both the perimeter dices and the spoil piles, the combination of frequency
of contact and rate of water movement supports the conclusions in my November 3 letter.
With the submittal of this information, the University believes that it has satisfied all of the DWQ concerns
raised during review of the EA for the Lake Raleigh Dredging Project.
Specific project design attributes, which mitigate potential impacts caused by floodwater contact with the
perimeter dikes and piles can be discussed in the context of acquiring the necessary permits for project
implementation. Commitments for implementing specific project design measures can be incorporated into
the Sedimentation and Erosion Control Plan and the 401 Water Quality Certification. A long-terns,
maintenance program can be managed under the University stormwater permit, which is currently being
reviewed by DWQ.
Sincerely,
15uane Knudson
'Environmental Affairs Manager

Enclosures
cc_ P. Stafford
North Carolina State University is a land- Office of Rnance and Business
grant university and a constituent institution Business Division
of The University of North Carolina
An Equal Opportunity/Affirmative Action Employer
http://www2.ncsu.edu/ncsu/ehs/
November 3, 1999
Gloria Putnam, SEPA Coordinator
Division of Water Quality
North Carolina Department of Environment and Natural Resources
P.O. Box 29535
Raleigh, NC 27626-0535
Environmental Health & Safety Center
Campus Box 8007
Raleigh, North Carolina 27695-8007
Director 919.515.4238
Environmental Affairs 919.515.6859
Industrial Hygiene 919.515.6860
Health and Safety 919.515.6858
Radiation Protection 919.515.2894
(Fax) 919.515.6307
References: Environmental Assessment and Finding of No Significant Impact; Lake Raleigh
Dredging Project, North Carolina State University, Centennial Campus. July 23, 1999.
Letter from Ms. Chrys Baggett to Mr. Duane Knudson, subject, "SCH File # 00-E-6030-
0043; Environmental Assessment/Finding of No Significant Impact Proposed Lake
Raleigh Dredging Project on the NCSU Centennial Campus. September 1, 1999.
Letter from Duane Knudson to Ms. Chrys Baggett, September 27, 1999.
Letter from Duane Knudson to Gloria Putnam, October 12, 1999.
Dear Ms. Putnam:
Enclosed is additional information on the remaining Division of Water Quality (DWQ) concerns on the
Environmental Assessment (EA) for this project. It is my understanding that the two areas of concern are
focused on the potential for erosion of the spoils material placed in the locations shown in the EA and the
evaluation of alternatives, which led to the selection of these areas.
In response to the first item, I have included the report entitled, "Supplemental Information, Disposal Area
Erosion Control, Lake Raleigh Sediment Removal Project, Raleigh, North Carolina." This report contains
additional modeling by the consultants who performed the floodplain impact analysis (AG&E). The
modeling shows that the maximum water level at the edge of the piles for the 100-year storm is less than 9
inches. This value is substantially less than the 2 foot height of the perimeter containment dike, which will
completely encircle the spoil piles. Therefore, the flood water is not expected to breach the perimeter dike
for the 100-year storm.
The flow rate of flood water past the piles, and the potential for pile erosion, was also a concern expressed
by DWQ. To address these concerns, the consultant calculated the flow rate at the edge of the piles for
several locations. The maximum flow rate at the point of contact to the pile (100-year storm) was
computed to be 1.9 feet/second (fps). Comparing this model-predicted maximum flow rate to established
allowable design velocities from the NCDENR, Division of Land Quality, Erosion and Sediment Control
Planning and Design Manual (Table 8.05a) for vegetated channels, provides a clear indication of the lack of
potential for erosion of the grassed dikes and piles. Maximum allowable design velocities for vegetated
channels with a slope of greater than 10% for grasses in clay-mix soil ranges from 3.5 to 4.5 fps.
Therefore, the maximum impact value for the 100-year storm of 1.9 fps is well below the maximum
allowable design value for direct contact from flowing water.
Gloria Putnam
November 3, 1999
Page 2
An analysis was performed in response to DWQ concerns that there may be alternative locations which
reduce the potential for environmental impacts for this project. The attached analysis considered four
alternative locations, in addition to that proposed in the EA. The evaluation concluded that placing spoils
material in other areas within economic range of the project site would produce an equivalent or higher
potential risk of environmental impact, compared to the proposed alternative. Therefore, the proposed
locations evaluated in the EA is the best alternative for spoils placement.
With the submittal of this information, the University believes that it has satisfied all of the DWQ concerns
raised during review of the EA for the Lake Raleigh Dredging Project.
Specific project design attributes can be discussed in the context of acquiring the necessary permits for
project implementation.
Sincerely,
Duane Knudson
Environmental Affairs Manager
Enclosures
cc: P. Stafford
LAKE RALEIGH DREDGING PROJECT - EA/FONSI
SUPPLEMENTAL ALTERNATIVES ANALYSIS
The following is a discussion of alternative locations for placement of the spoil material removed from the
dredging of sediment from Lake Raleigh, as described in the Environmental Assessment and Finding of No
Significant Impact - Lake Raleigh Dredging Project. The alternatives considered are:
• Proposed Alternative: Adjacent to Walnut Creek Floodway
• Alternative Area 1: Lake Wheeler Field Research Lab
• Alternative Area 2: South of Lake Raleigh and Walnut Creek
• Alternative Area 3: Adjacent to Walnut Creek Floodway - Southeast
• Alternative Area 4: Adjacent to Main Campus Drive
Proposed Alternative: Adjacent to Walnut Creek Floodway
The impacts associated with the proposed alternative are described in the following:
1. Environmental Assessment and Finding of No Significant Impact, Lake Raleigh Dredging Project
(July 23, 1999), and
2. Supplemental Information Disposal Area Erosion Control, Lake Raleigh Sediment Removal
Project (October 25, 1999).
The Environmental Assessment (Reference 1) concludes that:
The restoration of Lake Raleigh on Centennial Campus will not negatively affect the environment as
discussed herein. Any environmental consequences of this project will be minimal and confined to the
construction process.
The supplemental modeling analysis (Reference 2) concludes that:
• The modeled depth of water in the flood way (100-year storm) below the Lake Raleigh dam of about 9
inches is less than the height of the perimeter containment dike (2-ft) encircling each spoil pile.
• The modeled maximum flow velocity at the edge of the perimeter dike for the 100-year storm of 1.9
fps, is well below the maximum allowable design velocity for a vegetated channel of 3.5 to 4.5 fps.
Thus, the spoil piles and perimeter dikes will not be impacted by floodwater associated with the 100-year
flood, and will not be subject to erosion.
Alternative Area 1: Lake Wheeler Field Research Lab
The opportunity for placing the spoil material offsite is limited to the Lake Wheeler Field Research Lab,
located approximately three miles south the project site on Lake Wheeler Road. Issues associated with use
of this location for placement of spoils are described below.
Lake Raleigh Dredging Alternatives
Page 2
Although the Lake Wheeler Field Research Lab covers a large acreage, it has very little suitable unutilized
ground. Evaluation of suitable areas at the Field Research Lab was conducted for placement of the spoils
from the Yates Pond dredging activity. The results of that evaluation identified a few small areas, which
are either presently receiving, or are scheduled to receive the spoil material from Yates Pond.
Land at the Lab is intensively managed and is a precious commodity. Covering several tens of acres with
dredged spoil material, thus removing that land from productive use in the Lab's research programs is not
an option for the University.
There is ultimately no environmental gain associated with transporting the spoil material to the Field
Research Lab. The same potential environmental impacts, and need for mitigative measures, would be
present for placement at the Lab. Therefore, even if suitable and adequate space could be found at the Lab,
this alternative would have a significantly higher cost and provide no reduction in potential for
environmental impact.
Although specific cost estimates were not generated because of the considerations discussed above, the
logistics and cost of transporting the spoil material from the project site to Field Research Lab would
probably raise the project cost to prohibitive levels.
Therefore, this alternative was not considered viable.
Alternative Area 2: South of Lake Raleigh and Walnut Creek
The large area shown on the attached map as Area 2 has the following characteristics:
• The area is characterized by rolling hills and valleys with isolated flat areas, which are generally
limited to a few acres in size. Placing fill material in this ridge and valley setting would incur a high
risk of environmental impact and expensive engineering controls to limit that potential degradation.
• The likelihood of sediment loading of streams during the clearing and placement process would be
much higher for this area relative to spoil placement on flat ground nearer the removal area.
• Haul roads would have to be constructed into this area specifically to place the material.
• The general area is slated for intensive development. Although the specific nature of the development
is unknown at this time, the University is obligated to develop the area in order to realize its value to
the people of the State of North Carolina. Placing the spoil material in this area would eventually
require re-moving a portion of the material in the future, as the area is developed. This would likely
result in a higher potential for environmental impact at that time.
Utilizing this area for placing spoil from the lake bed would require substantial clearing, complex
engineering measures reflecting the topographic situation, re-moving a portion of the material as the area is
developed, and construction of additional haul roads. Therefore, this area was considered to pose a higher
environmental risk and be less suitable for spoil placement, relative to the proposed area.
Lake Raleigh Dredging Alternatives
Page 3
Alternative Area 3: Adjacent to Walnut Creek Floodway - Southeast
The area east of the proposed disposal area on the north side of Walnut Creek was evaluated for potential
use. However, there is no space for spoil placement between the wetlands and northern boundary of the
FEMA Floodway east of the proposed placement area.
Alternative Area 4: Adiacent to Main Campus Drive
The area shown on the map as Area 4 is located north of the proposed spoils areas, along the proposed
extension of Main Campus Drive south.
This area is divided into two subareas; east and west of Main Campus Drive. The west area is located
between Main Campus Drive and Walnut Creek and is only about 200 feet wide (at its widest point)
between the edge of the floodway and Main Campus Drive. Because the elevation of this area is essentially
the same as that for the proposed spoil areas, this area would experience the same type of impacts
associated with the other piles. Because of the small size of this area, use of this area was not considered.
The area to the east of Main Campus Drive and north of Eastgate Drive is a plateau of substantial size.
However, as shown on the provided maps, much of the area is slated for development. The remaining
portion of the area, which could be utilized for spoils placement is between Main Campus Drive and the
planned buildings. A rough estimate of the volume of material which could be placed in this area is less
than 10,000 yd3. The area has an approximate 5% slope.
Placing material in this area has some of the same concerns as discussed for Area 2. A combination of
building and roadway development scheduled for this area makes the location of the spoil placement an
important consideration. Moving the spoil material twice is undesirable from both an economic and
environmental perspective. Also, due to the slope of the area, sediment and erosion control during
placement and after would need to be carefully considered.
Because of the small volume of spoil which could be placed in this area and the plans for future use, the
relative potential for environmental impact associated with placing and controlling spoils in the area is
large, relative to the gain attributable to its use. Therefore, although usable, this area is considered less
desirable than the proposed area.
Conclusions
Placing spoils material in other areas within economic range of the project site would produce a higher
potential risk of environmental impact, compared to the proposed alternative. Therefore, the proposed
locations evaluated in the EA is the best alternative for spoils placement.
SUMMARY OF EVALUATION FOR POTENTIAL EROSION OF SPOIL PILES
In response to concerns expressed by the North Carolina Department of Environment and Natural
Resources, Division of Water Quality, additional modeling was performed to evaluate the potential for
erosion of the spoil piles generated from the dredging project. The modeling is described in the attached
report, "Supplemental Information, Disposal Area Erosion Control, Lake Raleigh Sediment Removal
Project." The report concludes the following.
The analysis shows that the sediment fill has a very small impact on the level of flooding
and the velocity in the channel within the disposal area. For the 100-year event, the
flooding elevation changes vary from +0.3 to +0.7 feet and the change in velocity varies
from -0.4 to 1.3 fps at the cross sections shown, beginning at the downstream end of the
sediment disposal area and continuing upstream. The placement of sediment fill in the
designated areas will not cause any measurable additional flooding downstream of the
disposal area, as shown in Attachment 1.
The study shows that the overland velocities of the floodwaters adjacent to the small
perimeter dike and the sediment pile slopes do not exceed 1.9 fps. These velocities are
considered very low for vegetated soils and should cause little or no soil erosion for
storms up to the 100-year event. The velocities for the 10-year, 50-year, and 100-year
storm events at various locations in the disposal area are tabulated in Attachment 2. The
storm water elevations and velocities at selected cross sections are summarized in the
table on Plate No. 2. The velocities adjacent to the shaped sediment piles range from 0.6
to 1.6 fps for the 10-year storm, 0.7 to 1.8 fps for the 50-year storm and 0.8 to 1.9 fps for
the 100-year storm.
Comparing the model-predicted flow rates against established allowable design velocities from the
NCDENR, Division of Land Quality, Erosion and Sediment Control Planning and Design Manual (Table
8.05a) for vegetated channels provides a clear indication of the lack of potential for erosion of the grassed
dikes and piles. Maximum allowable design velocities for vegetated channels with a slope of greater than
10% for grasses in clay-mix soil range from 3.5 to 4.5 fps. Therefore, the maximum impact value for the
100-year storm of 1.9 fps is well below the maximum allowable design value for direct contact from
flowing water.
Therefore, modeling of the impact of the 100-year storm shows that
• The depth of water (0.7 ft) is less than the height of the perimeter containment dike (2-ft) encircling
each spoil pile.
• The highest flow velocity at the edge of the perimeter dike will be 1.9 fps, which is well below the
maximum allowable design velocity for a vegetated channel of 3.5 to 4.5 fps.
Thus, the spoil piles will not be impacted by floodwater associated with the 100-year flood and will not be
subject to erosion.
? O
1§014 405-A Parkway Drive, Greensboro, N( 27401-1616
APPLIED GEOSCIENCES Phone [phone] Fax [phone]
AND ENGINEERING
July 16, 1999
Mr. S. Kenneth Jolly, P. E.
Manager-Raleigh Regulatory Field Office
US Army Corps of Engineers
6508 Falls of the Neuse Rd., Suite 120
Raleigh, NC 27615
Mr. John Dorney
Division of Water Quality
NC Department of Environment and Natural Resources (DENR)
4401 Reedy Creek Road
Raleigh, NC 27626-0535
SUBJECT: Lake Raleigh Sediment Removal Project
Supplemental Data for the Individual Permit Application
Dear Sirs:
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We are providing engineering services to Paul Stafford, NCSU, for the final designs associated with
the Lake Raleigh Sediment Removal Project. We understand that you are reviewing the Individual
Permit Application for the project. The preliminary design with the Individual Permit Application
refers to three temporary stream crossings and indicates that the final design will provide the details.
We have begun discussions with Mr. John Holley, DENR, about erosion and sediment control plans
for the project and he suggested that we send a copy of our proposed final design for the temporary
stream crossings to you for your review and to supplement the data you now have.
Please find enclosed three preliminary drawings for the Lake Raleigh Sediment Removal Project for
your review and reference. These drawings show our proposed detailed plans for the two temporary
stream crossings needed for the project. We believe an existing culvert road crossing, identified on
the drawings, will serve as the third temporary stream crossing for the haul road.
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If you need additional information or have any questions, please call.
Sincerely,
Donald L. Basinger, P.E.
Project Engineer
Attachments: Drawings for Temporary Stream Crossings
cc: Paul Stafford, NCSU
File
FILE: G:\PROJECTS\1074NCSU\CORRESPONDENCE\DEHNR\CORPS AND DWO 01 LTR - STREAM CROSSINGS.DOC
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