20001443 Ver 1_COMPLETE FILE_20001113

CITY OF RALEIGH NORTH CAROLINA

a
11. Central Engineering Department
222 West Hargett Street
Post Office Box 590
Raleigh, North Carolina 27602
[phone] I MARTY D. B12ZELL
FAX [phone] Project Engineer
City of Raleigh -
Central Engineering Department
222 West Hargett Street
Phone [phone]
?vi5?o?r o? ? TC 2 Q.¢??ry
To 'Ale,
Letter of Transmittal
Transmitted herewith are the following:
? Shop drawings ? Prints
? Progress drawings ?
Date oo Pro'. No.
Attention ',-?OWA/ ??e?,?Fy
Re:
? Tracings 140 UFbmittal Data
? S ecificaVpns- of Letter
WTFIO
Copies Date Number Description
- A14 o Al /Vo Z /?/*Pu > o

These ar ransmitted as follows:
For approval ? No exceptions noted ? Revise and resubmit
? For your use ? Make corrections noted ? Submit copies for distributions
? As requested ? Rejected ? Return corrected prints
? For review and comment ? Return copies of approved plans within 5 working days
Remarks &-g:fmc ?,4? Sri n ?u A4",9 &VKgs?

To
ned
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
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NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
November 16, 20000
County Wake
DWQ Project # 001443
APPROVAL of 401 Water Quality Certification and Neuse River Buffer Rules
Mr. Marty Bizzell
City of Raleigh Engineering Dept
222 West Hargett Street
Post Office Box 590
Raleigh, NC 27602
Dear Mr. Bizzell:
You have our approval, in accordance with the attached conditions, to impact in 200 linear feet of streams for the Lane
escribed
you
your purpose of restoring 3, 2000. stream After reviewing your application, oand n,lwe2have d cided that this fill as covered by General1Water
dated November , Number
the Quality Certification
This Number 27 This Certification ows yu to use Natinwide also valid for the Neuse River buffer rules (15A NtCAC 2B 0233). In addi on, you
Engineers rs issues approval is
should get any other federal, state or local permits before you go ahead with your project including (but not limited to) Also
this Sediment and Erosion Control, Coastal Stormwater, Non-Discharge and Wtaeer Supply Waters
otherwise r ul specified in the
permit
approval will expire when the accompanying 404 or CAMA
General Certification.
This approval is only valid for the purpose and design that you described in your application. If you change your If the pro project, you must notify us and send us d is new
thereby pons responsible orpcomplying w th all and tions. Thi sapproval copyhall
Certifica . If total
General
this Certification and approval letter an Y rovided in the
expire when the for thus expo project (now agor in on the fume) exceed one acre` compensatory mitigation may be requiredtas described
wetland fills fo fo P ]
in 15A NCAC 2H .0506 (h). For this approval to be valid, you must follow the conditions listed in the attach
certification.
If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You must
Rale h,
act within 60 days
of the North Carolina oGeneral Statutes tote Office of Administ ative Hearings ,p B wh27447ich
Chapter 1
N.C. 27611-7447. This certification and its conditions are final and binding unless you ask for a hearing.
This letter completes the review of the Division of Water Quality under Section 401 of the Clean Water Act. If you
have any questions, please telephone John Dorney at 919-733-9646.
Sincerely,
eStev
Attachment
cc: Corps of Engineers Raleigh Field Office
Raleigh DWQ Regional Office
File Copy
Central Files
Dave Penrose
Division of Water Quality • Wetlands/401 Unit
1621 Mail Service Center • Raleigh NC 27669-1621 .Telephone [phone] • FAX [phone]
An Equal Opportunity Affirmative Action Employer
50% recycled/10% post consumer paper
and, Natural Resourc.as
Division of Water Quality
James Hunt, Jr., Governor
Qill Holman, Secretary
Kerr T. Stevens, Direc:cr
i •
D E. N R
Division of Wcter Quciity
Envirenmentci Sc;ences Branch & Weticnds/401 Unit
Location: Zl-,' iReecy Creek Rocd
R :lei,gh, N.C. 27607
Meiling Address: 1621 ?iMcii Service Censer
R :ieic N.C. 27 699
FAX: (919) 7'959
FA.X TO: t V ?? } lZ z-e FAX NUMBER: g ? U
FROM:
PhONE: ,
NO. OF PAGES INCLUDING THIS SHE,:

If yCL receive this iC;C •., 7iS7C.k- ;?. e_ C^CS C '731 ^ 8- 0.
CK
DWQ ID: CORPS ACTION ID: a7
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #)at I _
PRE-CONSTRUCTION NOTIFICATION APPLICA W` f.`A!,Tc?Sof;P Y?
FOR NATIONWIDE PERMITS THAT REQUIRE:
1. NOTIFICATION TO THE CORPS OF ENGINEERS
2. APPLICATION FOR SECTION 401 CERTIFICATION
3. COORDINATION WITH THE NC DIVISION OF COASTAL MANAGEMENT
SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE FIELD
OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN (7) .
COPIES MUST BE SENT TO THE NC DIVISION OF WATER QUALITY,
ATTN: JOHN DORNEY, 4401 REEDY CREEK ROAD, RALEIGH, NC
27607. PLEASE PRINT OR TYPE.
1. PROPERTY OWNER'S NAME & ADDRESS:
Lot 83: Mr. Jeffrey & Christine Hillard Lot 82: Mr. Barry D & Carol C. Bennett OQI „
11416 Lostwood Lane 11420 Lostwood Lane
Raleigh, Nc 27614 Raleigh, NC 27614
Current Mailing Address:
Lot 81: Mr. Simon & Judith Capell Mr. Duke Bennett
11424 Lostwood Lane c/o Hoffman & Hoffman
Raleigh, NC 27614 9017-K Farrar Court
SUBDIVISION NAME Woodbridge Phase Three Richmond, VA 23236
Mr. John T. Fonville
9721 Fonville road
Wake Forest, NC 27587
2. APPLICANT MAILING ADDRESS:
City of Raleigh Engineering Department
222 West Hargett Street
PO Box 590
CITY: Raleigh STATE: NC ZIP CODE: 27602
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE):
Woodbridge Subdivision. 11416. 11420. & 11424 Lostwood Lane Lots 81, 82, & 83
3. APPLICANTS TELEPHONE NUMBER: (HOME) (WORK) 919-890-3030
4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER:
Mr. Stewart Sykes, PE
City Engineer
PO Box 590
Raleigh, NC 27602
919-890-3030
5. LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC MAP
OR AERIAL PHOTOGRAPHY WITH SCALE):000NTY: Wake - NEAREST TOWN: Raleigh
SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ECT.) Unnamed stream located
in the rear vards of lost 81-83 in the Woodbridge Subdivision. Physical address of lot 82 is 11420
Lostwood Lane. Woodbridge Subdivision is located just north of the intersection of Falls of The Neuse
Road and Dunn Road. Turning on to High Holly Lane just past this intersection, Lostwood Lane is the last
culdasack street to the left in the subdivision.
6. IMPACTED OR NEAREST STREAM/RIVER: Unnamed stream draining approximately 36 acres. The
stream enters the Neuse River further to the north. RIVER BASIN: Neuse River Basin
7. (a) IS PROJECT LOCATED NEAR WATER CLASSIFIED AS TROUT, TIDAL SALTWATER, (SA),
HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE WATERS (ORW), WATER
SUPPLY (WS-I OR WS-11)? YES ? NO ® IF YES, EXPLAIN:
(b) IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL
MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES ? NO
(c) IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY (SEE PAGE 7 FOR LIST OF
COASTAL COUNTIES), WHAT IS THE LAND USE PLAN (LUP) DESIGNATION?
8. (a) HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS
PROJECT? YES ? NO ® IF YES, PROVIDE ACTION I.D. NUMBER OF PREVIOUS PERMIT AND
ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 401 CERTIFICATION):
(b) ARE ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS PROPERTY IN THE FUTURE?
YES ? NO ® IF YES, DESCRIBE ANTICIPATED WORK:
9. (a) ESTIMATED TOTAL NUMBERS OF ACRES IN TRACT OF LAND: Lots 81, 82 & 83 comprise
1.25acres.
(b) ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
Wetlands are located above the proposed relocated channel segment The work that is proposed to be done in this area
is only the removal of fine sediment that has accumulated in the low flow channel due to the subdivision construction
activities It is anticipated that disturbance of this area will only occur during this removal of sediment. It is
anticipated that the area that will be teMorarily disturbed with equipment will be approximately 0.014 Acres.
10. (a) NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY:
FILLING: 0 Ac. EXCAVATION: Low flow channel will be cleaned out of excess sediment
deposited during the construction of the subdivision for approximately 60LF upstream of the proposed
channel relocation approximately 0.014 acres of wetlands will be temporarily impacted with equipment.
FLOODING: OTHER :
DRAINAGE : TOTAL ACRES TO BE IMPACTED: 0.014
(b) (1) STREAM CHANNEL TO BE IMPACTED BY THE PROPOSED PROJECT (IF RELOCATED,
PROVIDE DISTANCE BOTH BEFORE AND AFTER RELOCATION:
LENGTH BEFORE: 215 FT AFTER: 220 FT
WIDTH BEFORE (based on normal high water contours): 5 FT low water channel to a top width of
roximately 18 feet in the incised reach of channel that has been destabilized.
AVERAGE DEPTH BEFORE: ranges from 1 FT to head cut depth in the unstable reach of approximately
5'.
AFTER: The channel is proposed to be reconstructed to relocate it back to an abandoned channel location
and reconnect it with its floodplain. The existing incised channel with an active head cut is proposed to be
abandoned and filled. The new low flow channel will match the stable channel segment depths upstream
and downstream of the protect with a depth of 1-1.5 FT. The bankfull channel cross sectional area will match
the stable stream se m gents Wgream and downstream of the disturbed area. The stream has been designed as a "B"
stream type according to the Rosgen Classification system. A step pool system has been designed to transition
approximately 4.5 feet in elevation difference from the relocated channel elevation on the floodplain of Lot 82 to tie
into the existing stream elevation on Lot 81.
(b) (2) STREAM CHANNEL IMPACTS WILL RESULT FROM: (CHECK ALL THAT APPLY)
OPEN CHANNEL RELOCATION: X_ PLACEMENT OF PIPE IN CHANNEL: A temporary pipe for
construction equipment crossing is proposed to be installed during construction. CHANNEL
EXCAVATION: The bankful and lowflow channels will be constructied with cut and fill areas as
designated on the plan view and cross sections attached. CONSTRUCTION OF A DAM/FLOODING:
OTHER: Placement of rock grade control structures for grade control and construction of a step pool
system.
11. IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE SIZE OF THE WATERSHED
DRAINING TO THE POND? N/A WHAT IS THE EXPECTED POND SURFACE AREA?
12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OF MECHANICAL
EQUIPMENT TO BE USED? (ATTACH PLANS; 81/2 BY 11 DRAWINGS ONLY)
The proposed work includes relocating approximately 220 feet of channel to reconnect it with its original floodplain.
The channel will be placed back into an abandoned channel for approximately 140 feet the remaining 80 feet will be
constructed at a new location in the floodplain The new channel will be constructed and stabilized before the flow is
diverted through the newly constructed channel Clay plugs are proposed where the new channel is in close proximity
to the existing channel The bankfull and low flow channels will be shaped to the configurations as indicated on the
plan and cross sections attached. After the shaping of the channel the grade control structures will be installed. These
grade control rock structures will create a step pool system in transitioning the stream through a steep vertical slope.
The low flow channel upstream of the proposed relocated channel will be cleaned out of sediment that was deposited
during the construction of the subdivision After the flow is diverted to the new channel the old incised channel will be
backfilled and stabilized.
Theequipment that is proposed to be used for this work is as follows: The construction equipment will involve a small
excavator, hauling equipment such as trucks and a small backhoe with an hydraulic thumb for structure installation.
13. PURPOSE OF PROPOSED WORK: The existing, stream has a severe active head cut that has currently
incised the stream approximately 5 feet in depth The current nick point elevations are approximately three
feet below the elevation of the low flow channel The project is being proposed as a repair project to pnt
the channel back into a stable condition so that the head cut will not proceed any further upstream. If the
stream is not repaired the stream will continue to incise until it reaches equilibrium or encounters a grade
control structure such as the culvert under High Holly Lane approximately 550 feet upstream of the current
degraded stream segment If the repair is made in the near future the work would be limited to the 220 of
channel relocation and 60 feet of sediment removal proposed on the attached plans. If the project is
delayed the repair could involve up to an additional 550 feet of stream length.
14. STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED OUT IN
WETLANDS (INCLUDE ANY MEASURES TAKEN TO MRM IIZE WETLAND RVIPACTS) The
stream relocation segment of the 1goiect will not be in wetland areas However it is necessary to clean out the sediment
in the low flow channel upstream to improve the sediment transport capacity of the channel.
15. YOU ARE REQUIRED TO CONTACT THE US FISH AND WILDLIFE SERVICE AND/OR
NATIONAL MARINE FISHERIES SERVICE REGARDING THE PRESENCE OF ANY FEDERALLY
LISTED OR PROPOSED FOR LISTING ENDANGERED OR THREATENED SPECIES OR CRITICAL
HABITAT IN THE PERMIT AREA THAT MAY BE AFFECTED BY THE PROPOSED PROJECT.
DATE CONTACTED:
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHPO) REGARDING THE PRESENCE OF HISTORIC PROPERTIES IN THE PERMIT AREA
WHICH MAY BE AFFECTED BY THE PROPOSED PROJECT. DATE CONTACTED
17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OT THE USE OF PUBLIC
(STATE) LAND? YES ® NO ? (IF NO, GO TO 16)
(a) IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL
DOCUMENT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA
ENVIRONMENTAL POLICY ACT? YES ? NO
(b) IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA
DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE YES ? NO ?
IF ANSWER 17b IS YES, THEN SUBMIT APPROPRIATE DOCUMENTATION FROM THE STATE
CLEARINGHOUSE WITH THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT.
QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW PROCESS SHOULD BE
DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE CLEARINGHOUSE, NORTH
CAROLINA DEPARTMENT OF ADMINISTRATION, 116 WEST JONES STREET, RALEIGH,
NORTH CAROLINA 27603-8003, TELEPHONE [phone].
18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS APPLICATION IF PROPOSED
ACTIVITY INVOLVES THE DISCHARGE OF EXCAVATED OF FILL MATERIAL INTO
WETLANDS:
(a) WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STREAMS, LAKES, AND
PONDS ON THE PROPERTY (FOR NATIONWIDE PERMIT NUMBERS 14, 18, 21, 26, 29, AND 38).
ALL STREAM (INTERMITTENT AND PERMANENT) ON THE PROPERTY MUST BE SHOWN ON
THE MAP. MAP SCALES SHOULD BE I INCH EQUALS 50 FEET OF I INCH EQUALS 100 FEET
OF THEIR EQUIVALENT.
(b) IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WETLANDS TO BE IMPACTED BY
PRODUCT.
(c) IF DELINEATION WAS PERFORMED BY A CONSULTANT, INCLUDE ALL DATA SHEETS
RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE.
(d) ATTACH A COPY OF THE STORMWATER MANAGEMENT PLAN IF REQUIRED.
(e) WHAT IS LAND USE OF SURROUNDING PROPERTY? Residential and undeveloped land
(fl IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL? N/A
SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF APPLICABLE.
NOTE: WETLANDS OR WATERS OF THE US MAY NOT BE IMPACTED PRIOR TO:
i. ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS PERMIT,
2. EITHER THE ISSUANCE OR WAIVER OF A 401 DIVISION OF WATER QUALITY
CERTIFICATION, AND
3. (IN THE TWENTY COASTAL COUNTIES ONLY), A LETTER FROM THE NORTH
CAROLINA DIVISION OF COASTAL MANAGEMENT STATING THE PROPOSED
ACTIVITY IS CONSISTENT WITH THE NORTH CAROLINA COASTAL MANAGEMENT
PROGRAM,
TURF DATE
(AGENT'S SIGNATURE VALID ONLY
IF AUTHORIZATION LETTER FROM
THE OWNER IS PROVIDED).
PROJECT BACKGROUND
The City of Raleigh's Stormwater Engineering Department received a request for
assistance with stabilizing a severely eroded streambank at 11420 Lostwood Lane. The
site was investigated by the City's staff and it was determined the erosion qualified for
assistance under the City's drainage assistance policy. A drainage assessment was
prepared and subsequently, the project was approved by the Raleigh City Council. Under
the policy, the City will share in 2/3 of the cost of the project with the property owner
paying 1/3 of the cost. The City will be responsible for the design, permitting and
construction of the project. An outside contractor, currently under contract with the City,
will perform the construction.
A detailed natural channel design for the repair was then prepared by the engineering
consultant for the City of Raleigh. The work currently being proposed is approximately
220 linear feet of stream relocation/ improvement. The existing stream has a severe
active head cut that has currently incised the stream approximately 5 feet in depth. The
project will consist of relocating the existing incised channel back to an abandoned
location to reconnect the stream with its original floodplain above the incised channel.
The proposed channel will be constructed to match the existing stable stream segments
upstream and downstream of the degraded stream segment.
AVOIDANCEIMINIMIZATION OF WETLAND, STREAM AND
BUFFER IMPACTS
This project is a stream repair project initiated because of the degradation of an existing
stream due to a head cut. The stream is currently head cutting approximately 3-5 feet in
depth from the existing channel elevations. If nothing is done at this location the head
cut will proceed upstream until the stream either reaches equilibrium or encounters a
grade control structure that prevents further down cutting. Approximately 550 feet
upstream of the present nick point is a culvert under High Holly Lane. It is more than
likely that the stream could continue its incision to this culvert.
Stabilization of the incised channel will not correct the head cut problem nor be a long
term solution. During storm events the shear stresses on the existing incised narrow
channel with high banks will continue to erode and slump in the existing banks creating
high sediment input to the stream. The incised channel would most likely widen over
time sluffmg off patch measures on the bank and would continue to encroach even further
towards residential structures.
It is appropriate to take actions to repair the problem that exists with this stream before
the degradation of the stream is extended any further upstream. The natural channel
designed that has been proposed for this project will maintain channel stability and the
natural integrity of the stream along with its' riparian area. By abandoning the incised
channel and re-constructing a new channel on the active floodplain, stormwater flow will
be maintained with lower velocities providing for a more stable reach. To transition the
channel back to a significantly lower channel bed elevation a series of step pools have
been designed to dissipate energy and maintain the stream bed grade.
The low flow channel upstream of the project has accumulated sediment most likely from
construction activities during the construction of the subdivision. The proposed sediment
removal from this stream length will improve future sediment transport capabilities.
Measures will be taken during construction to minimize any impacts to adjacent wetland
vegetation.
SCOPE
The objective of this stream restoration project is to improve the water quality, riparian
quality and stability of this stream. Restoring the natural flow pattern of the stream will
accomplish this. Long-term stabilization will be accomplished by stabilizing the riparian
area with native vegetation.
Specific objectives for the project are as follows:
1. Create correct habitat types within the stream channel.
2. Stabilize the bankfull elevation along the reach.
3. Slope and vegetate the streambanks so they are more resistant to flooding.
4. Plant native trees, bushes and ground cover that will stabilize the streambanks,
shade the stream, and provide wildlife cover and food.
STREAM RESTORATION
The stream work currently being proposed is approximately 220 linear feet of stream
bank relocation and stabilization. An additional 60 linear feet of stream upstream of the
proposed relocated channel is proposed to have the fine sediments removed in the low
flow channel that were deposited during the subdivision construction to improve
sediment transport capacity during future storm events.
Within the 220 linear feet of stream improvements, approximately 80 feet will be
constructed at a new location within the floodplain. The remaining 140 feet will involve
improvements made to the existing channel at its present location or at the location of an
abandoned channel segment.
The stream was designed based on reference reach data obtained on the stable stream
segments directly upstream and downstream of the disturbed project stream segment.
Cross section 4 referenced in the attached calculations was taken downstream of the
project area. The approximate drainage area to this location is 36 acres. Cross section 7
was taken at the upstream end of the project area. The drainage area to this location is
approximately 23 acres. The stream proposed to be constructed is a moderately
entrenched `B" Stream Type as classified by the Rosgen Classification System.
The following design parameters and ranges were used:
Bankfull Chaj
Wbkf
dbkf
dmax
W/d
Abkf
mel:
=24 ft.-18 ft.
= 0.93 ft. -0.6 ft.
= 2.54 ft.- 1.97 ft.
= 41-19
=16.6 sq.ft. -14 sq.ft.
Low Flow Channel Dimensions:
Area = 5.6 sq.ft. - 3.1 sq.ft.
Top width = 4.9 ft. - 3.6 ft.
Depth = 1.36 ft. -1.1 ft.
Bottom width = 3.5 ft. - 2.8 ft.
W/d = 3.6 -3.4
The stream will be constructed with two slopes. The upstream segment from station
0+80 to 2+11 will be constructed with a bankfull water surface slope of 0.03 ft./ft. The
stream segment from 2+11 to 2+76 will be constructed as a transition step pool system
that will drop the elevation of the stream approximately 4.5 feet. The grade control will
be accomplished by installing cross veins at the locations on the plans to provide for an
approximate 18 inch drop between each structure. These structures will be constructed of
flat angular stones approximately 1.5'x 2'x 3'. The details have been provided herein.
RIPARIAN RESTORATION
The slopes that are outside of the bankfull limits will be over seeded with an appropriate
grass mixture and mulched. Erosion control fabric for these slopes will be used only in
the areas designated on the plans.
Within the bankfull limits the slopes will be seeded with native herbaceous and woody
plant seeds. The bankfull slopes will be stabilized with coconut fiber blanket stapled to
the ground using metal landscape staples. The blankets will stabilize the area from the
streambed to the top to the stream bankfull limits long enough for the vegetation to root
and stabilize the stream for the long term.
Low growing woody species such as alder, willow, dogwood, and buttonbush will be
planted. These species will be planted as bare rooted or potted stock during the dormant
season. As much as possible trees that are on site will be avoided.
Riparian species were chosen to be aesthetically pleasing and to benefit wildlife by
providing food or habitat. Only native species will be used to re-vegetate the riparian
zone. A selection of the following species will be used at this site:
American Witch-hazel (Hamamelis virginiana), Arrowhead (Sagittaria latifolia),
Buttonbush (Cephalanthus occidentalis), Pickerelweed (Pontederia cordata), Blackgum
(Nyssa sylvatica), Dog Hobble (Leucothoe fontanesiana), Silky Dogwood (Cornus
amomum), Black Walnut (Juglans nigra), Green Ash (Fraxinus pennsylvanica), Red Bud
(Cercis canadensis), Red Maple (Acer rubrum), River Birch (Betula nigra), Serviceberry
(Amelanchier arborea), Sweetspire (Itea Virginica) and Sycamore (Platamus
occidentalis). All flower species will be planted 3 to 4 feet apart, bush species 4-8 feet
apart and trees will be planted 10-15 feet apart.
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Lostwood Lane Raleigh, North Carolina
Erosional face looking at house on Lot 82
Incised Channel Eroded Bank

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Construction Plan, Profile, Cross Sections
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ADJACENT OWNERS:
LOT 83 JEFFERY & CHRISTINE HILLARD
11416 LOSTWOOD LANE
RALEIGH, N.C. 27614
LOT 82 BARRY D. & CAROL C. BENNETT
11420 LOSTWOOD LANE
RALEIGH, N.C. 27614
CURRENT MAILING ADDRESS:
MR. DUKE BENNETT
c/o HOFFMAN & HOFFMAN
9017-K FARRAR COURT
RICHMOND, VA 23236
LOT 81 SIMON & JUDITH CAPELL
11424 LOSTWOOD LANE
RALEIGH, N.C. 27614
JOHN T. FONVILLE
9721 FONVILLE ROAD
WAKE FOREST, N.C. 27587
PRELIMINARY
PLAN NOT FOR
CONSTRUCTION
290
285
280
275
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LEGEND
PROPOSED COMPACTED BACKFILL
SEEDED & MULCHED EXCEPT WHERE NOTED
PROPOSED CUT
- - - - EXISTING STREAM CENTER LINE
-- --- EXISTING SANITARY SEWER LINE
- - - EXISTING CHANNEL
- - - - - PROPOSED STREAM CENTERLINE
x- x- x-
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PROPOSED CHANNEL
EROSION CONTROL FENCE
PROPOSED ROCK GRADE CONTROL STRUCTURES
PROPERTY LINE
WAKE COUNTY TOPOGRAPHIC INFORMATION
(SOURCE-' WAKE COUNTY GIS.)
PROPOSED CLAY PLUG
TEMPORARY BENCH MARK

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BANKFULL WIDTH
BANKFULL ELEV.
SEE PROFILE
TOP OF STRUCTU
SEE PROFILE
FOOTER ROCKS TYP.
:TOR
BAN
TOP OF STRUCTURE
_LEV. Ot OF CHANNEL
FOOTER ROCKS TYP.
FLOOW
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ROCK SIZE:
MINIMUM SIZE
1.5'x2'x3' STONE
FLAT ANGULAR ROCI
GRADE CONTROL CROSS VANE STRUCTURE
NTS
(ADAPTED FROM ROSGEN, 1994)
PURE
ANNEL
Construction Sequence
1. Obtain permits from the City of Raleigh and the State of North Carolina
for construction and all other approvals necessary to begin and complete
the project located on an unnamed stream adjacent to Lostwood Lane.
2. Install erosion control measures as shown on the plans. The contractor
may modify or relocate erosion control measures to make adjustments for
unforeseen field conditions so long as proper construction is maintained
to ensure the integrity and usefulness of the proposed measures. All
relocations shall have the approval. of the engineer.
3. If it is determined during the course of construction that significant
sediment is leaving the site despite the proper implementation and
maintenance of erosion control measures as shown on the plans. The
person responsible for the land disturbing activity is obligated to take
additional protective action.
4. The work will be preformed using equipment working at the top of the
existing stream valley bank. Construction equipment will not be placed
within the active low flow channel.
5. A temporary 24 inch diameter CMP pipe approximately 20 feet in length
will be installed in the incised channel to provide construction access to
the proposed channel location. This pipe will maintain normal flow
through the construction area and will be removed before the incised
channel is filed.
6. Material that is removed from the stream will be temporarily stored out
side of the bankfull channel. No excess material will be used as fill
material in the floodplain except for areas designated on the plan as fill in
the incised channel to be abandoned with the new channel construction.
7. Construction access to the project site will be only at the locations
designated on the plans.
8. Contractor is to take measures to prevent damage during construction to
existing structures, utlity services and lines on the project site.
Contractor shall be responsible for having the existing utilities located
before construction begins.
9. Contractor will work with the engineer to layout the proposed stream
alignment and bankfull elevations.
10. Begin construction on the new channel location while maintaining
normal flow in the incised channel. Shape the new channel to the cut
slopes as designated on the plans.
11. Where possible the contractor will remove the existing vegetation with
topsoil as intact mats to re-vegetate the newly excavated banks. The
contractor shall take measures to maintain the health of these transplants.
These transplant mats will be secured to the channel slopes with wooden
stakes. Ideal areas for transplants are adjacent to rock structures.
12 Install the grade control structures after the channel has been shaped.
13. Within the bankfull limits the slopes will be seeded with native
herbaceous and woody plant seeds. Stabilize seeded sections of the
bankfull bank with coconut fiber blankets stapled to the ground using
metal landscape staples. Plant woody species as identified
in the vegetation specification.
14. Block 24-inch diameter pipe with wood to an elevation of 18 inches to
provide a temporary settling basin for sediment during the removal of
fines from the upstream channel reach west of the proposed channel
construction. These materials will be removed from the floodplain area.
15. Divert the normal flow to the newly constructed channel.
16. Fill the incised channel to the grades as shown on the plans and stabilize
with seed and mulch except where noted on the plans. The construction
plans indicate areas outside of the bankfull limits that will require the
installation of erosion control fabric.
17. Install woody vegetation as required by the city.
18. Remove all temporary erosion control measures.
19. Repair and seed lawns damaged during construction activities.
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DATE: 10-04-00
REVISIONS:
PROJECT NAME:
LOSTWOODS LANE
DWG NAME:
xis-sections
SCALE:
NTS
SHEET NO.
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X-Section 4
Elev MH = 283.99 Field shot from 1st set up to determine MH elevation
MH = 4.01
HI = 288
STA ELEV FS Notes
0.0 279.67 8.33
2.2 278.14 9.86 bank full
3.5 277.88 10.12
5.0 277.69 10.31
7.0 277.49 10.51
9.0 277.64 10.36
11.0 277.51 10.49
11.8 277.28 10.72 top
12.6 275.93 12.07 toe
14.6 275.61 12.39 thal
16.1 275.88 12.12 toe
16.7 276.97 11.03 top
18.1 277.81 10.19
20.0 278.15 9.85 bank full
24.1 278.44 9.56
25.3 279.69 8.31
27.4 280.36 7.64
* downstream reference reach, type E
X-Sect 4
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X-Section 7 Upstream reference reach
This section not tied into a hub elevation HI
assumed 105
HI = 105
STA ELEV FS Notes
0 102.02 2.98
1.5 101.15 3.85
1.9 100.85 4.15 bank full
3.0 100.64 4.36
5.0 100.21 4.79
6.8 99.87 5.13 top
7.4 99.09 5.91 toe
9.2 98.85 6.15 thal
10.2 98.84 6.16 toe
10.4 99.91 5.09 top
14.0 100.27 4.73
16.0 100.50 4.50
18.0 100.49 4.51
20.0 100.49 4.51
22.0 100.59 4.41
26.0 100.82 4.18 bank full
29.9 101.12 3.88
31.0 101.52 3.48
32.0 102.01 2.99
*upstream reference reach, type E
X-Sect 7
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99.0-
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STA
DWQ ID: CORPS ACTION ID:
NATIONWIDE PERMIT REQUESTED (PROVIDE NATIONWIDE PERMIT #) NOY 3W
PRE-CONSTRUCTION NOTIFICATION APPLIC TI ;? Nun &O! 'T
Y.. .
FOR NATIONWIDE PERMITS THAT REQUIRE: F?
1. NOTIFICATION TO THE CORPS OF ENGINEERS
2. APPLICATION FOR SECTION 401 CERTIFICATION
3. COORDINATION WITH THE NC DIVISION OF COASTAL MANAGEMENT
SEND THE ORIGINAL AND (1) COPY OF THIS COMPLETED FORM TO THE APPROPRIATE FIELD
OFFICE OF THE CORPS OF ENGINEERS (SEE AGENCY ADDRESSES SHEET). SEVEN (71
COPIES MUST BE SENT TO THE NC DIVISION OF WATER QUALITY,
ATTN: JOHN DORNEY. 4401 REEDY CREEK ROAD, RALEIGH, NC
27607. PLEASE PRINT OR TYPE.
1. PROPERTY OWNER'S NAME & ADDRESS:
Lot 83: Mr. Jeffrey & Christine Hillard Lot 82: Mr. Barry D & Carol C. Bennett
11416 Lostwood Lane 11420 Lostwood Lane
Raleigh, Nc 27614 Raleigh, NC 27614
Current Mailing Address:
Lot 81: Mr. Simon & Judith Capell Mr. Duke Bennett
11424 Lostwood Lane c/o Hoffman & Hoffnan? /
Raleigh, NC 27614 9017-K Farrar Court
SUBDIVISION NAME Woodbridge Phase Three Richmond, VA 23236
Mr. John T. Fonville f
9721 Fonville road -lI`p
Wake Forest, NC 27587
2. APPLICANT MAILING ADDRESS:
City of Raleigh Engineering Department l ? S? (?'"
222 West Hargett Street
PO Box 590 lU r
CITY: Raleigh STATE: NC ZIP CODE: 27602 j? ?o I 1
PROJECT LOCATION ADDRESS, INCLUDING SUBDIVISION NAME (IF DIFFERENT FROM
MAILING ADDRESS ABOVE):
Woodbridge Subdivision, 11416, 11420, & 11424 Lostwood Lane Lots 81, 82, & 83
3. APPLICANTS TELEPHONE NUMBER: (HOME) (WORK) 919-890-3030
4. IF APPLICABLE: AGENT'S NAME OR RESPONSIBLE CORPORATE OFFICIAL, ADDRESS,
PHONE NUMBER:
Mr. Stewart Sykes, PE
City Engineer
PO Box 590
Raleigh, NC 27602
919-890-3030
5.
LOCATION OF WORK (PROVIDE A MAP, PREFERABLY A COPY OF USGS TOPOGRAPHIC MAP
OR AERIAL PHOTOGRAPHY WITH SCALE):COUNTY: Wake - NEAREST TOWN: Raleigh
SPECIFIC LOCATION (INCLUDE ROAD NUMBERS, LANDMARKS, ECT.) Unnamed stream located
in the rear vards of lost 81-83 in the Woodbridae Subdivision. Physical address of lot 82 is 11420
Lostwood Lane. Woodbridge Subdivision is located lust north of the intersection of Falls of The Neuse
Road and Dunn Road. Turning on to High Holly Lane lust past this intersection,_Lostwood Lane is the last
culdasack street to the left in the subdivision.
6. IMPACTED OR NEAREST STREAM/RIVER: Unnamed stream d
stream enters the Neuse River further to the north. RIVER BASIN:
7. (a) IS PROJECT LOCATED NEAR WATER CLASSIFIED AS TROUT, TIDAL SALTWATER, (SA),
HIGH QUALITY WATERS (HQW), OUTSTANDING RESOURCE WATERS (ORW), WATER
SUPPLY (WS-I OR WS-II)? YES ? NO ® IF YES, EXPLAIN:
(b) IS THE PROJECT LOCATED WITHIN A NORTH CAROLINA DIVISION OF COASTAL
MANAGEMENT AREA OF ENVIRONMENTAL CONCERN (AEC)? YES ? NO
(c) IF THE PROJECT IS LOCATED WITHIN A COASTAL COUNTY (SEE PAGE 7 FOR LIST OF
COASTAL COUNTIES), WHAT IS THE LAND USE PLAN (LUP) DESIGNATION?
8. (a) HAVE ANY SECTION 404 PERMITS BEEN PREVIOUSLY REQUESTED FOR USE ON THIS
PROJECT? YES ? NO ® IF YES, PROVIDE ACTION I.D. NUMBER OF PREVIOUS PERMIT AND
ANY ADDITIONAL INFORMATION (INCLUDE PHOTOCOPY OF 401 CERTIFICATION):
(b) ARE ADDITIONAL PERMIT REQUESTS EXPECTED FOR THIS PROPERTY IN THE FUTURE?
YES ? NO ® IF YES, DESCRIBE ANTICIPATED WORK:
9. (a) ESTIMATED TOTAL NUMBERS OF ACRES IN TRACT OF LAND: Lots 81, 82 & 83 comprise
1.25acres.
(b) ESTIMATED TOTAL NUMBER OF ACRES OF WETLANDS LOCATED ON PROJECT SITE:
Wetlands are located above the proposed relocated channel segment The work that is proposed to be done in this area
is only the removal of fine sediment that has accumulated in the low flow channel due to the subdivision construction
activities. It is anticipated that disturbance of this area will only occur during this removal of sediment. It is
anticipated that the area that will be temporarily disturbed with equipment will be approximately 0.014 Acres.
10. (a) NUMBER OF ACRES OF WETLANDS IMPACTED BY THE PROPOSED PROJECT BY:
FILLING: 0 Ac. EXCAVATION: Low flow channel will be cleaned out of excess sediment
deposited during the construction of the subdivision for approximately 60LF upstream of the proposed
channel relocation approximately 0.014 acres of wetlands will be temporarily impacted with equipment.
FLOODING: OTHER :
DRAINAGE : TOTAL ACRES TO BE IMPACTED: 0.014
(b) (1) STREAM CHANNEL TO BE IMPACTED BY THE PROPOSED PROJECT (IF RELOCATED,
PROVIDE DISTANCE BOTH BEFORE AND AFTER RELOCATION:
LENGTH BEFORE: 215 FT AFTER: 220 FT
WIDTH BEFORE (based on normal high water contours): 5 FT low water channel to a top width of
approximately 18 feet in the incised reach of channel that has been destabilized.
AVERAGE DEPTH BEFORE: ranges from 1 FT to head cut depth in the unstable reach of approximately
5'.
AFTER: The channel is proposed to be reconstructed to relocate it back to an abandoned channel location
and reconnect it with its floodplain. The existing incised channel with an active head cut is proposed to be
abandoned and filled. The new low flow channel will match the stable channel segment depths upstream
and downstream of the proiect with a depth of 1-1.5 FT. The bankfull channel cross sectional area will match
the stable stream segments upstream and downstream of the disturbed area. The stream has been designed as a "B"
stream We according to the Rosgen Classification system. A step pool system has been designed to transition
approximately 4.5 feet in elevation difference from the relocated channel elevation on the floodplain of Lot 82 to tie
into the existing stream elevation on Lot 81.
(b) (2) STREAM CHANNEL IMPACTS WILL RESULT FROM: (CHECK ALL THAT APPLY)
OPEN CHANNEL RELOCATION: X PLACEMENT OF PIPE IN CHANNEL: A temporary pipe for
construction equipment crossing is proposed to be installed during construction. CHANNEL
EXCAVATION: The bankful and lowflow channels will be constructied with cut and fill areas as
designated on the plan view and cross sections attached. CONSTRUCTION OF A DAM/FLOODING:
OTHER: Placement of rock grade control structures for grade control and construction of a step pool
system.
11. IF CONSTRUCTION OF A POND IS PROPOSED, WHAT IS THE SIZE OF THE WATERSHED
DRAINING TO THE POND? N/A WHAT IS THE EXPECTED POND SURFACE AREA?
12. DESCRIPTION OF PROPOSED WORK INCLUDING DISCUSSION OF TYPE OF MECHANICAL
EQUIl'MENT TO BE USED? (ATTACH PLANS; 81/2 BY I I DRAWINGS ONLY)
The proposed work includes relocating, approximately 220 feet of channel to reconnect it with its original floodplain.
The channel will be placed back into an abandoned channel for approximately 140 feet the remaining 80 feet will be
constructed at a new location in the floodplain The new channel will be constructed and stabilized before the flow is
diverted through the newly constructed channel Clay plugs are proposed where the new channel is in close proximity
to the existing channel The bankfull and low flow channels will be shaped to the configurations as indicated on the
plan and cross sections attached. After the shaping _of the channel the grade control structures will be installed. These
rude control rock structures will create a std pool system in transitioning the stream through a steep vertical slope.
The low flow channel upstream of the proposed relocated channel will be cleaned out of sediment that was deposited
during the construction of the subdivision After the flow is diverted to the new channel the old incised channel will be
backfilled and stabilized.
The equipment that is proposed to be used for this work is as follows: The construction equipment will involve a small
excavator, hauling equipment such as trucks and a small backhoe with an hydraulic thumb for structure installation.
13. PURPOSE OF PROPOSED WORK: The existing stream has a severe active head cut that has currently
incised the stream approximately 5 feet in depth The current nick point elevations are approximately three
feet below the elevation of the low flow channel. The proiect is being _proposed as a repair project to put
the channel back into a stable condition so that the head cut will not proceed any further upstream. If the
stream is not repaired the stream will continue to incise until it reaches equilibrium or encounters a grade
control structure such as the culvert under High Holly Lane approximately 550 feet upstream of the current
degraded stream segment If the repair is made in the near future the work would be limited to the 220 of
channel relocation and 60 feet of sediment removal proposed on the attached plans. If the project is
delayed the repair could involve up to an additional 550 feet of stream length.
14. STATE REASONS WHY IT IS BELIEVED THAT THIS ACTIVITY MUST BE CARRIED OUT IN
WETLANDS (INCLUDE ANY MEASURES TAKEN TO MINIMIZE WETLAND IMPACTS) The
stream relocation segment of the project will not be in wetland areas. However it is necessary to clean out the sediment
in the low flow channel upstream to improve the sediment transport capacity of the channel
15. YOU ARE REQUIRED TO CONTACT THE US FISH AND WILDLIFE SERVICE AND/OR
NATIONAL MARINE FISHERIES SERVICE REGARDING THE PRESENCE OF ANY FEDERALLY
LISTED OR PROPOSED FOR LISTING ENDANGERED OR THREATENED SPECIES OR CRITICAL
HABITAT IN THE PERMIT AREA THAT MAY BE AFFECTED BY THE PROPOSED PROJECT.
DATE CONTACTED:
16. YOU ARE REQUIRED TO CONTACT THE STATE HISTORIC PRESERVATION OFFICER
(SHPO) REGARDING THE PRESENCE OF HISTORIC PROPERTIES IN THE PERMIT AREA
WHICH MAY BE AFFECTED BY THE PROPOSED PROJECT. DATE CONTACTED
17. DOES THE PROJECT INVOLVE AN EXPENDITURE OF PUBLIC FUNDS OT THE USE OF PUBLIC
(STATE) LAND? YES ® NO ? (IF NO, GO TO 16)
(a) IF YES, DOES THE PROJECT REQUIRE PREPARATION OF AN ENVIRONMENTAL
DOCUMENT PURSUANT TO THE REQUIREMENTS OF THE NORTH CAROLINA
ENVIRONMENTAL POLICY ACT? YES ? NO 21
(b) IF YES, HAS THE DOCUMENT BEEN REVIEWED THROUGH THE NORTH CAROLINA
DEPARTMENT OF ADMINISTRATION STATE CLEARINGHOUSE YES ? NO ?
IF ANSWER 17b IS YES, THEN SUBMIT APPROPRIATE DOCUMENTATION FROM THE STATE
CLEARINGHOUSE WITH THE NORTH CAROLINA ENVIRONMENTAL POLICY ACT.
QUESTIONS REGARDING THE STATE CLEARINGHOUSE REVIEW PROCESS SHOULD BE
DIRECTED TO MS. CHRYS BAGGETT, DIRECTOR STATE CLEARINGHOUSE, NORTH
CAROLINA DEPARTMENT OF ADMINISTRATION, 116 WEST JONES STREET, RALEIGH,
NORTH CAROLINA 27603-8003, TELEPHONE [phone].
18. THE FOLLOWING ITEMS SHOULD BE INCLUDED WITH THIS APPLICATION IF PROPOSED
ACTIVITY INVOLVES THE DISCHARGE OF EXCAVATED OF FILL MATERIAL INTO
WETLANDS:
(a) WETLAND DELINEATION MAP SHOWING ALL WETLANDS, STREAMS, LAKES, AND
PONDS ON THE PROPERTY (FOR NATIONWIDE PERMIT NUMBERS 14, 18, 21, 26, 29, AND 38).
ALL STREAM (INTERMITTENT AND PERMANENT) ON THE PROPERTY MUST BE SHOWN ON
THE MAP. MAP SCALES SHOULD BE 1 INCH EQUALS 50 FEET OF 1 INCH EQUALS 100 FEET
OF THEIR EQUIVALENT.
(b) IF AVAILABLE, REPRESENTATIVE PHOTOGRAPH OF WETLANDS TO BE IMPACTED BY
PRODUCT.
(c) IF DELINEATION WAS PERFORMED BY A CONSULTANT, INCLUDE ALL DATA SHEETS
RELEVANT TO THE PLACEMENT OF THE DELINEATION LINE.
(d) ATTACH A COPY OF THE STORMWATER MANAGEMENT PLAN IF REQUIRED.
(e) WHAT IS LAND USE OF SURROUNDING PROPERTY? Ryesidential and undeveloped land
(fl IF APPLICABLE, WHAT IS PROPOSED METHOD OF SEWAGE DISPOSAL? N/A
SIGNED AND DATED AGENT AUTHORIZATION LETTER, IF APPLICABLE.
NOTE: WETLANDS OR WATERS OF THE US MAY NOT BE IMPACTED PRIOR TO:
1. ISSUANCE OF A SECTION 404 CORPS OF ENGINEERS PERMIT,
2. EITHER THE ISSUANCE OR WAIVER OF A 401 DIVISION OF WATER QUALITY
CERTIFICATION, AND
3. (IN THE TWENTY COASTAL COUNTIES ONLY), A LETTER FROM THE NORTH
CAROLINA DIVISION OF COASTAL MANAGEMENT STATING THE PROPOSED
ACTIVITY IS CONSISTENT WITH THE NORTH CAROLINA COASTAL MANAGEMENT
PROGRAM,
OWNER'S T IGNATURE DATE
(AGENT'S SIGNATURE VALID ONLY
IF AUTHORIZATION LETTER FROM
THE OWNER IS PROVIDED).
PROJECT BACKGROUND
The City of Raleigh's Stormwater Engineering Department received a request for
assistance with stabilizing a severely eroded streambank at 11420 Lostwood Lane. The
site was investigated by the City's staff and it was determined the erosion qualified for
assistance under the City's drainage assistance policy. A drainage assessment was
prepared and subsequently, the project was approved by the Raleigh City Council. Under
the policy, the City will share in 2/3 of the cost of the project with the property owner
paying 1/3 of the cost. The City will be responsible for the design, permitting and
construction of the project. An outside contractor, currently under contract with the City,
will perform the construction.
A detailed natural channel design for the repair was then prepared by the engineering
consultant for the City of Raleigh. The work currently being proposed is approximately
220 linear feet of stream relocation/ improvement. The existing stream has a severe
active head cut that has currently incised the stream approximately 5 feet in depth. The
project will consist of relocating the existing incised channel back to an abandoned
location to reconnect the stream with its original floodplain above the incised channel.
The proposed channel will be constructed to match the existing stable stream segments
upstream and downstream of the degraded stream segment.
AVOIDANCE/MW' DUZATION OF WETLAND, STREAM AND
BUFFER IMPACTS
This project is a stream repair project initiated because of the degradation of an existing
stream due to a head cut. The stream is currently head cutting approximately 3-5 feet in
depth from the existing channel elevations. If nothing is done at this location the head
cut will proceed upstream until the stream either reaches equilibrium or encounters a
grade control structure that prevents further down cutting. Approximately 550 feet
upstream of the present nick point is a culvert under High Holly Lane. It is more than
likely that the stream could continue its incision to this culvert.
Stabilization of the incised channel will not correct the head cut problem nor be a long
term solution. During storm events the shear stresses on the existing incised narrow
channel with high banks will continue to erode and slump in the existing banks creating
high sediment input to the stream. The incised channel would most likely widen over
time sluffmg off patch measures on the bank and would continue to encroach even further
towards residential structures.
It is appropriate to take actions to repair the problem that exists with this stream before
the degradation of the stream is extended any further upstream. The natural channel
designed that has been proposed for this project will maintain channel stability and the
natural integrity of the stream along with its' riparian area. By abandoning the incised
channel and re-constructing a new channel on the active floodplain, stormwater flow will
be maintained with lower velocities providing for a more stable reach. To transition the
channel back to a significantly lower channel bed elevation a series of step pools have
been designed to dissipate energy and maintain the stream bed grade.
The low flow channel upstream of the project has accumulated sediment most likely from
construction activities during the construction of the subdivision. The proposed sediment
removal from this stream length will improve future sediment transport capabilities.
Measures will be taken during construction to minimize any impacts to adjacent wetland
vegetation.
SCOPE
The objective of this stream restoration project is to improve the water quality, riparian
quality and stability of this stream. Restoring the natural flow pattern of the stream will
accomplish this. Long-term stabilization will be accomplished by stabilizing the riparian
area with native vegetation.
Specific objectives for the project are as follows:
1. Create correct habitat types within the stream channel.
2. Stabilize the bankfull elevation along the reach.
3. Slope and vegetate the streambanks so they are more resistant to flooding.
4. Plant native trees, bushes and ground cover that will stabilize the streambanks,
shade the stream, and provide wildlife cover and food.
STREAM RESTORATION
The stream work currently being proposed is approximately 220 linear feet of stream
bank relocation and stabilization. An additional 60 linear feet of stream upstream of the
proposed relocated channel is proposed to have the fine sediments removed in the low
flow channel that were deposited during the subdivision construction to improve
sediment transport capacity during future storm events.
Within the 220 linear feet of stream improvements, approximately 80 feet will be
constructed at a new location within the floodplain. The remaining 140 feet will involve
improvements made to the existing channel at its present location or at the location of an
abandoned channel segment.
The stream was designed based on reference reach data obtained on the stable stream
segments directly upstream and downstream of the disturbed project stream segment.
Cross section 4 referenced in the attached calculations was taken downstream of the
project area. The approximate drainage area to this location is 36 acres. Cross section 7
was taken at the upstream end of the project area. The drainage area to this location is
approximately 23 acres. The stream proposed to be constructed is a moderately
entrenched `B" Stream Type as classified by the Rosgen Classification System
The following design parameters and ranges were used:
Bankfull Chaj
Wbkf
dbkf
dmax
W/d
Abkf
znel:
=24 ft.-18 ft.
= 0.93 ft. -0.6 ft.
= 2.54 ft.- 1.97 ft.
= 41-19
= 16.6 sq.ft. -14 sq.ft.
Low Flow Channel Dimensions:
Area = 5.6 sq.ft. - 3.1 sq.ft.
Top width = 4.9 ft. - 3.6 ft.
Depth = 1.36 ft. -1.1 ft.
Bottom width = 3.5 ft. - 2.8 ft.
W/d = 3.6 -3.4
The stream will be constructed with two slopes. The upstream segment from station
0+80 to 2+11 will be constructed with a bankfull water surface slope of 0.03 ft./ft. The
stream segment from 2+11 to 2+76 will be constructed as a transition step pool system
that will drop the elevation of the stream approximately 4.5 feet. The grade control will
be accomplished by installing cross veins at the locations on the plans to provide for an
approximate 18 inch drop between each structure. These structures will be constructed of
flat angular stones approximately 1.5'x 2'x 3'. The details have been provided herein.
RIPARIAN RESTORATION
The slopes that are outside of the bankfull limits will be over seeded with an appropriate
grass mixture and mulched. Erosion control fabric for these slopes will be used only in
the areas designated on the plans.
Within the bankfull limits the slopes will be seeded with native herbaceous and woody
plant seeds. The bankfull slopes will be stabilized with coconut fiber blanket stapled to
the ground using metal landscape staples. The blankets will stabilize the area from the
streambed to the top to the stream bankfull limits long enough for the vegetation to root
and stabilize the stream for the long term.
Low growing woody species such as alder, willow, dogwood, and buttonbush will be
planted. These species will be planted as bare rooted or potted stock during the dormant
season. As much as possible trees that are on site will be avoided.
Riparian species were chosen to be aesthetically pleasing and to benefit wildlife by
providing food or habitat. Only native species will be used to re-vegetate the riparian
zone. A selection of the following species will be used at this site:
American Witch-hazel (Hamamelis virginiana), Arrowhead (Sagittaria latifolia),
Buttonbush (Cephalanthus occidentalis), Pickerelweed (Pontederia cordata), Blackgum
(Nyssa sylvatica), Dog Hobble (Leucothoe fontanesiana), Silky Dogwood (Cornus
amomum), Black Walnut (Juglans nigra), Green Ash (Fraxinus pennsylvanica), Red Bud
(Cercis canadensis), Red Maple (Acer rubrum), River Birch (Betula nigra), Serviceberry
(Amelanchier arborea), Sweetspire (Itea Virginica) and Sycamore (Platamus
occidentalis). All flower species will be planted 3 to 4 feet apart, bush species 4-8 feet
apart and trees will be planted 10-15 feet apart.
Lostwood Lane Raleigh, North Carolina
Erosional face looking at house on Lot 82
Incised Channel Eroded Bank

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Construction Plan, Profile, Cross Sections
And Details

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ADJACENT OWNERS:
LOT 83 JEFFERY & CHRISTINE HILLARD
11416 LOSTWOOD LANE
RALEIGH, N.C. 27614
LOT 82 BARRY D. & CAROL C. BENNETT
11420 LOSTWOOD LANE
RALEIGH, N.C. 27614
CURRENT MAILING ADDRESS:
MR. DUKE BENNETT
c/o HOFFMAN & HOFFMAN
9017-K FARRAR COURT
RICHMOND, VA 23236
LOT 81 SIMON & JUDITH CAPELL
11424 LOSTWOOD LANE
RALEIGH, N.C. 27614
JOHN T. FONVILLE
9721 FONVILLE ROAD
WAKE FOREST, N.C. 27587
PRELIMINARY
PLAN NOT FOR
CONSTRUCTION
290
285
280
275

LEGEND
PROPOSED COMPACTED BACKFILL
SEEDED & MULCHED EXCEPT WHERE NOTED
PROPOSED CUT
- - - - - EXISTING STREAM CENTER LINE
-- --- EXISTING SANITARY SEWER LINE
- - - - EXISTING CHANNEL
- - - - - - - - PROPOSED STREAM CENTERLINE
PROPOSED CHANNEL
- x- x- x- EROSION CONTROL FENCE
(?oo

PROPOSED ROCK GRADE CONTROL STRUCTURES
PROPERTY LINE
WAKE COUNTY TOPOGRAPHIC INFORMATION
(SOURCE-.' WAKE COUNTY GIS.)
PROPOSED CLAY PLUG
TEMPORARY BENCH MARK

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BANKFULL WIDTH
BANKFULL ELEV.
SEE PROFILE
TOP OF STRUCTURE ELEV.
SEE PROFILE
FOOTER ROCKS TYP.
:TOR
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fOP OF STRUCTURE
-LEV. rt OF CHANNEL
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MINIMUM SIZE
1.5'x2'x3' STONE
FLAT ANGULAR ROCI
GRADE CONTROL CROSS VANE STRUCTURE
NTS
(ADAPTED FROM ROSGEN, 1994)
PURE
4NNEL
Construction Sequence
1. Obtain permits from the City of Raleigh and the State of North Carolina
for construction and all other approvals necessary to begin and complete
the project located on an unnamed stream adjacent to Lostwood Lane.
2. Install erosion control measures as shown on the plans. The contractor
may modify or relocate erosion control measures to make adjustments for
unforeseen field conditions so long as proper construction is maintained
to ensure the integrity and usefulness of the proposed measures. All
relocations shall have the approval. of the engineer.
3. If it is determined during the course of construction that significant
sediment is leaving the site despite the proper implementation and
maintenance of erosion control measures as shown on the plans. The
person responsible for the land disturbing activity is obligated to take
additional protective action.
4. The work will be preformed using equipment working at the top of the
existing stream valley bank. Construction equipment will not be placed
within the active low flow channel.
5. A temporary 24 inch diameter CMP pipe approximately 20 feet in length
will be installed in the incised channel to provide construction access to
the proposed channel location. This pipe will maintain normal flow
through the construction area and will be removed before the incised
channel is filed.
6. Material that is removed from the stream will be temporarily stored out
side of the bankfull channel. No excess material will be used as fill
material in the floodplain except for areas designated on the plan as fill in
the incised channel to be abandoned with the new channel construction.
7. Construction access to the project site will be only at the locations
designated on the plans.
8. Contractor is to take measures to prevent damage during construction to
existing structures, utility services and lines on the project site.
Contractor shall be responsible for having the existing utilities located
before construction begins.
9. Contractor will work with the engineer to layout the proposed stream
alignment and bankfull elevations.
10.Begin construction on the new channel location while maintaining
normal flow in the incised channel. Shape the new channel to the cut
slopes as designated on the plans.
11. Where possible the contractor will remove the existing vegetation with
topsoil as intact mats to re-vegetate the newly excavated banks. The
contractor shall take measures to maintain the health of these transplants.
These transplant mats will be secured to the channel slopes with wooden
stakes. Ideal areas for transplants are adjacent to rock structures.
12. Install the grade control structures after the channel has been shaped.
13. Within the bankfull limits the slopes will be seeded with native
herbaceous and woody plant seeds. Stabilize seeded sections of the
bankfull bank with coconut fiber blankets stapled to the ground using
metal landscape staples. Plant woody species as identified
in the vegetation specification.
14. Block 24-inch diameter pipe with wood to an elevation of 18 inches to
provide a temporary settling basin for sediment during the removal of
fines from the upstream channel reach west of the proposed channel
construction. These materials will be removed from the floodplain area.
15. Divert the normal flow to the newly constructed channel.
16. Fill the incised channel to the grades as shown on the plans and stabilize
with seed and mulch except where noted on the plans. The construction
plans indicate areas outside of the bankfull limits that will require the
installation of erosion control fabric.
17. Install woody vegetation as required by the city.
18. Remove all temporary erosion control measures.
19. Repair and seed lawns damaged during construction activities.
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DATE: 10-04-00
REVISIONS:
PROJECT NAME:
LOSTWOODS LANE
DWG NAME:
xis-sections
SCALE:
NTS
SHEET NO.
Supporting Reference Reach
Data
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X-Section 4
Elev MH = 283.99 Field shot from 1st set up to determine MH elevation
MH = 4.01
HI = 288
STA ELEV FS Notes
0.0 279.67 8.33
2.2 278.14 9.86 bank full
3.5 277.88 10.12
5.0 277.69 10.31
7.0 277.49 10.51
9.0 277.64 10.36
11.0 277.51 10.49
11.8 277.28 10.72 top
12.6 275.93 12.07 toe
14.6 275.61 12.39 thal
16.1 275.88 12.12 toe
16.7 276.97 11.03 top
18.1 277.81 10.19
20.0 278.15 9.85 bank full
24.1 278.44 9.56
25.3 279.69 8.31
27.4 280.36 7.64
* downstream reference reach, type E
X,Sect 4
281.0-
280.5-
280.0
279.5
279.0
278.5
J 278.0
w
277.5
277.0
276.5
276.0
275.5
275.0
0 5 10 15 20 25 30
STA
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X-Section 7 Upstream reference reach
This section not tied into a hub elevation HI
assumed 105
HI = 105
STA ELEV FS Notes
0 102.02 2.98
1.5 101.15 3.85
1.9 100.85 4.15 bank full
3.0 100.64 4.36
5.0 100.21 4.79
6.8 99.87 5.13 top
7.4 99.09 5.91 toe
9.2 98.85 6.15 thal
10.2 98.84 6.16 toe
10.4 99.91 5.09 top
14.0 100.27 4.73
16.0 100.50 4.50
18.0 100.49 4.51
20.0 100.49 4.51
22.0 100.59 4.41
26.0 100.82 4.18 bank full
29.9 101.12 3.88
31.0 101.52 3.48
32.0 102.01 2.99
*upstream reference reach, type E
X-Sect 7
103.0
102.5
102.0
101.5
> 101.0
W
J
w 100.5
100.0
99.5
99.0
98.5
0 5 10 15 20 25 30 35
STA