19970686 Ver 1_COMPLETE FILE_19970804

r`- --or
State of North Carolina
Department of Environment,
Health and Natural Resources
Division of Water Quality
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
A. Preston Howard, Jr., P.E., Director
AT.R?FAAM4 40 0
?EHNF?
September 19, 1997
Mecklenburg County
DWQ Project # 970686
APPROVAL of 401 Water Quality Certification and ADDITIONAL
CONDITIONS
Mr. Andrew A. Burg, P.E.
Project Manager
Mecklenburg County
700 East Tryon Street
Charlotte, North Carolina 28202
Dear Mr. Burg:
You have our approval, in accordance with the attached conditions and those listed below, to
place fill dirt material in 1.6 acres of waters for the purpose of stabilizing the streambanks of
Irwin Creek at Clayton Road to West Blvd., as you described in your application dated July 30,
1997. After reviewing your application, we have decided that this fill is covered by General Water
Quality Certification Number 3102 This certification allows you to use Nationwide Permit
Number 13 when it is issued by the Corps of Engineers. In addition, you should get any other
federal, state or local permits before you go ahead with your project including (but not limited to)
Sediment and Erosion Control, Coastal Stormwater, Non-Discharge and Water Supply Watershed
regulations. This approval will expire when the accompanying 404 or CAMA permit expires
unless otherwise specified in the General Certification.
This approval is only valid for the purpose and design that you described in your application
except as modified below. If you change your project, you must notify us and you may be
required to send us a new application. If total wetland fills for this project (now or in the future)
exceed one acre, 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 in the
attached certification and any additional conditions listed below.
1. A. final mitigation and monitoring plan shall be developed and submitted to DWQ before
construction begins.
2. An as built plan shall be prepared and submitted to DWQ after construction is completed.
If you do not accept any of the conditions of this certification, you may ask for an
adjudicatory hearing. You must act within 60 days of the date that you receive this letter. To ask
for a hearing, send a written petition which conforms to Chapter 150B of the North Carolina
General Statutes to the Office of Administrative Hearings, P.O. Box 27447, Raleigh, N.C.
27611-7447. This certification and its conditions are final and binding unless you ask for a
hearing.
Division of Water Quality - Environmental Sciences Branch
Environmental Sciences Branch, 4401 Reedy Creek Rd., Raleigh, NC 27607 Telephone [phone] FAX # [phone]
An Equal Opportunity Affirmative Action Employer • 50% recycled/10% post consumer paper

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 919-733-1786.
Attachment
cc: Wilmington District Corps of Engineers
Corps of Engineers Asheville Field Office
Mooresville DWQ Regional Office
Mr. John Dorney
Central Files
Pn
Howard, IrP.E.
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Gannett Fleming
ENGINEERS AND PLANNERS
November 25, 1997
K to-?
GANNETT FLEMING CORDDRY
AND CARPENTER, INC.
Suite 914
301 South McDowell Street
Charlotte, NC 28204
Fax: [phone]
Off ice: [phone]
o iE4?
yI
North Carolina Department of Environment,
Health and Natural Resources
Division of Water Quality
4401 Reedy Creek Road
Raleigh, North Carolina 27607
Attn: Environmental Sciences Branch
Mr. A. Preston Howard, Jr. PE
RE: Action ID No. 199707256 and Nationwide Permit No. 13 (Bank Stabilization)
Section 404 Permit Application
Irwin Creek, West Blvd. to Clanton Rd., Charlotte, NC
Dear Sirs:
Enclosed please find our addendum to the Section 404 permit application for the subject
project. Included in this addendum is a fishery enhancement plan and a vegetation
management plan in response to your approval letter dated September 19, 1997. Please
contact me at [phone] should you need additional information or wish to discuss this
submittal in more detail.
Very trul
GAAI4'
Thomas W1 Lamkrt. PE
DRY and CARPENTER, INC.
G(
A Tradition of Excellence Since 1915
Gannett Fleming
As a condition for issuing a nationwide permit for stream bank protection on Irwin Creek in
Charlotte, North Carolina, the NC DEHNR specified that a mitigation and monitoring plan
needed to be developed for the project area. The following sections describe three parts of this
plan.
Vegetation Management
The vegetation management plan is intended to "balance storm water management with aquatic
habitat considerations and will specify the type, height, and frequency of pruning for the soil
bioengineered bank stabilization."
The recommended plan is a "no management" strategy that allows natural vegetative
succession to occur. Thus, over time, the soil bioengineering method is invaded by
surrounding vegetation and evolves through vegetative succession into a natural system
consisting of a mixture of trees, shrubs, and herbaceous vegetation. Mature woody vegetation
communities provide numerous environmental benefits, including shade to reduce water
temperature, overhanging cover for the fish, organic debris for instream cover and food for
aquatic organisms, and riparian habitat.
o Mecklenburg County Storm Water Services (SWS) inspectors will perform quarterly
inspections to ensure that significant areas of treatment are not destroyed through
erosion or other means.
o SWS maintenance crews will repair any failed sections.
o SWS maintenance crews will also provide minor pruning to ensure that a "balanced"
vegetative succession occurs.
Allowing the soil bioengineering installations to evolve through vegetative succession will have
minimal impacts on flood conveyance. Any increase in flow resistance over current conditions
will be more than offset by increases in channel cross sectional area associated with bank
grading activities. Flow resistance from bank vegetation is low initially and increases as plants
grow. Flow resistance will peak during the three (3) to five (5) years following installation
and then begin to decline slightly as a dense tree canopy begins to develop and shade out
understory vegetation. Under bankfull conditions, the maximum Manning's roughness
coefficient for the bank is estimated to be 0.09. If a roughness coefficient of 0.03 is assumed
for the channel bed, then the composite Manning's coefficient in the channel (weighted by
wetted perimeter) would be 0.05, a value that is considered representative of existing
conditions. Flood heights will be monitored during this interim period to ensure that the soil
bioengineering treatment does not increase flooding. Should increases in flooding occur, then
SWS will investigate an alternative method to maintain the soil bioengineered channel banks to
decrease the channel roughness while maintaining overall vegetative system integrity.
Gannett Fleming
Fishery Enhancement
The fish enhancement plan for the proposed project in this section of Irwin Creek consists of
three phases; long term stream trends monitoring by Mecklenburg DEP, riparian reforestation
program by County SWS Operations, and in-stream fish habitat improvement via construction
contract. Each of these are described in the following paragraphs.
Long-Term Stream Trends Monitoring - The Mecklenburg County Department of
Environmental Protection (MCDEP) maintains a stream monitoring program that includes a
fish habitat diversity analysis on a yearly basis, and a water quality analysis on a monthly basis
of in-stream levels of dissolved oxygen, fecal coliform, phosphate, nitrates, nitrites,
biochemical oxygen demand, total suspended solids, pH, turbidity, lead, and zinc. This
program is an on-going program and will be continued based on funding availability.
Based on the last fish diversity test, the subject channel reach currently exhibits eleven types of
fish and therefore is considered to be in fair condition with regard to fish diversity. The
current monitoring shows that the dissolved oxygen levels in the stream reach have not
dropped below 8.0 ppm during the last five years. State standards reference an aquatic danger
threshold level 5.0 ppm for dissolved oxygen.
The future monitoring results will be used to gauge the success of the soil bioengineering
applications and aquatic habitat improvement techniques on the overall water quality in the
project stream reach.
Fish Habitat Improvement - Mecklenburg County Storm Water Services (SWS) in
coordination with MCDEP has intiated a fish habitat improvement program for this stream
reach. The program includes the construction of aquatic habitat improvement techniques
beginning in the summer of 1997. Two techniques are being considered; boulder clusters and
rock deflectors. Details of these techniques were submitted earlier.
Riparian Reforestation Program
Construction Phase - The riparian reforestation efforts for this phase of the project will
consist of the soil bioengineering applications as detailed in the "Coir Fiber Section" of the
construction plans. These applications include live cuttings inserted between layers of Coir mat
revetment. Additionally, seedlings (sprigs) of various species will be planted by County forces
at top of banks where needed (as determined by Gannett Fleming). The plantings will cover
selected areas of the channel banks. The length of the stream bank affected by this phase of
the project is 7,870 bank feet of a total 18,400 bank feet in the project area. It is anticipated
that these plantings, managed as previously described, will mature into tree stands that provide
shading for the baseflow conditions in the stream.
Post Construction Phase - Riparian reforestation will continue in the planting phase of this
project utilizing soil-bioengineering techniques. These techniques will include live staking and
Gannett Fleming
joint planting. Additionally, seedlings (sprigs) and containerized trees and/or shrubs of
various species will be planted by County forces at top of banks where needed (as determined
by Gannett Fleming). The planting will again cover only selected areas of the channel banks.
The length of bank affected will be determined in the field but, it is estimated that
approximately 10,090 bank feet will be affected.
Installation of soil-bioengineering techniques is best accomplished while the plant material is
dormant, that is from late fall to early spring. Regular inspections of the installations is
required and prompt repairs made if needed. Periodic pruning and replanting will be
necessary to establish healthy and vigorous vegetation.
State of North Carolina
Department of Environment,
Health and Natural Resources
AmesB. Hunt, Jr., Govemor
Jonathan & Howes, Secretary
Steven J. Levitasy Deputy Secretary

X? '
?EHNR
Division of Water Quality
Environmental Sciences Branch
4401 Reedy Creek Road
Raleigh, N.C. 27607
FAX:[phone]
FAX TO: kndv Aw10 I FAXNUMBER: 70?-336-YW I
FROM: Pe4 CCd wZffi IZIIQ
PHONE: 107 - 773-1 7f if
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M Charlotte-Mecklenhurg
STORM Administrative Offices: Mecklenburg County Engineering Department
n ty 068 6 700 North Tryon Street, Charlotte, North Carolina 28202
WAS y ` [phone] FAX [phone]
Services
A R?cF??Fp
July 30, 1997 14&n
Steve Lund ??/R?NMF,yT? 199j
United States Army Corps of Engineers q? s0?F?c
Grove Arcade Bldg. #75 Fs
37 Battery Park Avenue
Asheville, NC 28810-2714
Re: Irwin Creek Streambank Stabilization and Habitat Restoration Project
PERMIT APPLICATION - NATIONWIDE 13 & NCDEHNR EROSION CONTROL
Dear Steve:
Mecklenburg County Storm Water Services is embarking on another large streambank stabilization and
habitat restoration project. As a new member of the team, I have been studying the techniques that we are
proposing and look forward to implementing them in the field. As Paige Baker of our office has already
told you, Irwin Creek will require a mix of different construction techniques. These are shown on the
enclosed preliminary plans and cross sections (reduced to 8'/2 x 11").
Note that many of the reaches of this creek will be improved through the use of "soft" solutions --- laid
back slopes with erosion control blankets and stabilized with various plantings. We propose the use of
seeded mixes, live staking and planting of tree saplings. In areas where "hard" improvements are
required (near bridges, to save mature trees, channel bends and at the toe of bank), we will be placing
limited amounts of class 1 rip-rap. Grading will include a balanced design of both cut and fill sections.
Planting information is further detailed in the project's special provisions. Erosion control will be used in
all construction zones per state requirements.
Though not explicitly shown on the preliminary plans at this time, we propose to create habitat
enhancements for fish and aquatic life similar to those in the enclosed photographs. Due to the recent
rainstorms and flooding, we will conduct a field walk to determine the most suitable locations for these
structures. Specific planting criteria for grass seed, buffers, bushes, live stakes and hardwood trees has
been developed and will be further defined subsequent to the next field walk. After stabilizing the
streambanks, efforts will be on creating riffle pools, varying low-flow channel geometry, placing boulder
clusters, etc. per the attached details.
We are working with Mecklenburg County Department of Environmental Protection personnel to keep
them apprised of our plans and have active monitoring programs to obtain data before, during and after
construction for various living organisms. This data can then be used as a yardstick to measure the
positive benefit that this project will provide. More information on this program can be obtained from
Tony Roux at 704-336-5500.
Please review the enclosed materials (plans, special provisions, photographs of recently completed Little
Sugar Creek at Huntingtowne Farms Park project) so that we may obtain a NATIONWIDE 13
STREAMBANK ALTERATION PERMIT from your office at the earliest possible time. Concurrently we are
applying to NCDEHNR for review and approval of A SEDMIENTATION AND EROSION CONTROL
PERMIT and a 401 WATER QUALITY CERTIFICATION and also to the US FISH AND WILDLIFE
SERVICE. We are forwarding via e-mail electronic photographs of other recently completed projects
indicating our use of the above-described methods.
d:"sworddocumentslusace 1c.doc To report drainage problems: 336-RAIN
Printed on recycled paper.
t
Fees for this project will be paid by this office. Please advise us of the amount(s) required. The
engineering consultant on this project is Gannett Fleming --- Jesse Hite is project principal and may be
reached at 704-375-2438.
Please give me a call at your convenience. I'd like to speak with you about this project and look forward
to your input. I may be reached at 704-336-4328 or send e-mail to [e-mail].
In the near future, you'll also find project specific updates on our website at
http://www.charmeck.nc.us/coeng.
Sincerely
Burg, PE, RLS
Capital Projects Manager
PS -I have three more projects "in the immediate pipeline."
&Vwword documentslusace k.doc
DEM ID: ACTION ID:
Nationwide Permit Requested (Provide Nationwide Permit ft
JOINT FORM FOR
Nationwide permits that require notification to the Corps of Engineers
Nationwide permits that require application for Section 401 certification
WII.MINGTON DISTRICT ENGINEER
CORPS OF ENGINEERS
DEPARTMENT OF THE ARMY
P.O. Box 1890
Wilmington, NC 28402-1890
ATM: CESAW-CO-E
Telephone [phone]
WATER QUALITY PLANNING
DIVISION OF ENVIRONMENTAL MANAGEMENT
NC DEPARTMENT OF ENVIRONMENT, HEALTH,
AND NATURAL RESOURCES
P.O. Box 29535
Raleigh, NC 27626-0535
ATTN: MR. JOHN DORNEY
Telephone [phone]
ONE (1) COPY OF THIS COMPLETED APPLICATION SHOULD BE SENT TO THE CORPS OF ENGINEERS.
SEVEN (7) COPIES SHOULD BE SENT TO THE N.C. DIVISION OF ENVIRONMENTAL MANAGEMENT.
PLEASE PRINT.
1. Owners Name: Mecklenburg County
2. Owners Address: 700 N. Tryon Street, Charlotte, NC 28202
3. Owners Phone Number (Home): (Work): 704-336-3733
4. If Applicable: Agent's name or responsible corporate official, address, phone number:
Andrew A. Burg, PE, LS - Project Manager, 704-336-4328
5. Location of work (MUST ATTACH MAP). County: Mecklenburg
Nearest Town or City:
Charlotte
Specific Location'(Include road numbers, landmarks, etc.): Irwin Creek from its intersection wit]
West Blvd. downstream to its intersection with Clanton Rd.
6. Name of Closest S tream/River. Irwin /Sugar Creek
7. River Basin: Catawba.
8. Is this project located in a watershed classified as Trout, SA, HQW, ORW, WS I, or WS H? YES [ ] NO [x]
9. Have any Section 404 permits been previously requested for use on this property? YES [ J NO [x]
If yes, explain.
10. Estimated total number of acres of waters of the U.S., including wetlands, located on project site.. 9.3 a c .
11. Number of acres of waters of the U.S., including wetlands, impacted by the proposed project:
Filled: 0.7 Ac.
Drained: 0 Ac.
Flooded: 0 Ac.
Excavated: 0.9 Ac.
Total Impacted: 1.6 Ac.
FIGURE 1
LOCATION OF PROJECT AREA
(NOT TO SCALE)
Nl?
[99 Gannett Fleming
ENGINEERS AND PLANNERS
Streambank Stabilization of Irwin Creek
West Boulevard to Clanton Road
Aquatic Habitat Improvement Techniques
Method
BOULDER CLUSTER
Several large boulders are placed
in a riffle to create stru=ral
completdty indudi g eddies and
small pools. used as tearing areas
by sahronids and other fish.
Boulders may also be placed
singly in a random fashion. This
method requires minirnal
rnaintenarae
Description
Notes

1. Clusters are comprised of 3-5 boulders.
Z The clusters should be triangular and placed in the downstream
half of a tong riffle or glide.
3. Boulders should not be placed in pools.
4. Clusters placed in the same stream section should be at ie= W
of the stream width apart
5. Boulders are most affective in wide, shallow. high velocity streams
with gravel or rubble bottoms.
6. Clusters can be placed in deeper areas to cause undenurtting and
increase cover.
7. Height of boulders is determined by the desired habitat effects.
8. Boulders must heavy enough to resist: movement by rapid
strearn6ows.

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40
Watershed Restoration SourceBook Page -115 ???
Method
ROCK. GASfON OR
LOG-FRIUIE
DEFLECTORS
Aquatic Habitat Improvement Techniques
Description Notes
Defek = should not be installed in unstable ffoodplains or braided
1
Defectors are used to narrow and .
charnels and are best suited fm low gradimIL meandering
deepen streams, encourage
meandering. form pools, increase streams. lower half of tong rifle
should be consmicted in
cover and protect erodng banks. 2 The strucaue
sections to prevent baekwatarng upstream.
Defectors are triangular in shape
and may be constructed trorn rock, than 30 to 45
3. The defectors should bmt an angle not rt ?t? meander
h the streambanK conforming
i
gabion or logs. Depending on t
degrees w
of the stream. The greater the velocity of the water the smaller the
stream conditions. time strucwres
can be used singly or in series. At angle of defection-

water
a
the ?
The top level of the defector should be _
4
feast three defectors should be ?? ?
d?
.
yet low enough b allow passage high
level
constructed in a series for best ,
flows
results. .
5. Log frame deflectors consist of a triangular log frame filled with
uld be anchored at least 1.8 m (6
h
o
fitly placed r0d The logs s
ft) into the bank and severed to the stream bottom using 1-1.5 in
(3.35 !t.) rods.
6. The point of connection to ft river bank should be armored with
rip-rap to prevent washout m it
7. The bank opposite the defector may also need nP•rap Protect
erosion.
8. Gabion defectors should be imbedded into the steam bottom at
feast one4W of their total height. be inserted into the bed to
9. Willow and other riparian species may
give a more natural appearance.
cabioa Deflector
n
a3v/
0.5w
Flo ,
d5-
- -!-__ Log-Frame Deflector
".... \ O V
T kM
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Rock Deflector Q
page -113
Watershed Restoration SourceBook

W=I&
Aquatic Habitat Improvement Techniques
Method Description
CHANNEL Channel constrictors are essentially
CONSTRICTORS two deflectors on opposite sides of
(Wing Deflectors) the stream. They are designed to
narrow and deepen the channel
thereby as" poob to itnptwe
fish rearing habitat BadaKater,
reaft g drain fie wa uction wild
cause small grayel deposits to form
upstream. ihnproving spawning
habitat for fish. Constrictors may
be constructed of rocK gabions or
logs.
Notes
t. Design callarda are very Similar to those used for deflectors.
2 Constrictors should reduce stream width by about 25X
3. At the mid-pointof the strueaue. the constrictor should be roughly
the height at evectad high flow.
4. it constrictors are installed in series they should be at least 5
stream widths from each other.
5. The constrdc.'tors should be wed secured into the steambank and
battorrh
6. Banks downstream of the st xwm should be protected against
possible erosion.
7.Opposing deflectors should not constrict the stream more than half
the channel width and should only be installed in straight sections.
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charione•mochenharg
STORM
WATER
Services r
July 30, 1997
970686 Administrative Offices: Mecklenburg County Engineering Department
` 700 North Tryon Street, Charlotte, North Carolina 28202
[phone] FAX[phone]
Steve Lund RECEIVED
United States Army Corps of Engineers
Grove Arcade Bldg. #75 AVG
37 Battery Park Avenue ? ?99T,
Asheville, NC 28810-2714 ENVlRONy?EN1gl SCIENCES
Re: Irwin Creek Streambank Stabilization and Habitat Restoration Project
PERMIT APPLICATION - NATIONWIDE 13 & NCDEHNR EROSION CONTROL
Dear Steve:
Mecklenburg County Storm Water Services is embarking on another large streambank stabilization and
habitat restoration project. As a new member of the team, I have been studying the techniques that we are
proposing and look forward to implementing them in the field. As Paige Baker of our office has already
told you, Irwin Creek will require a mix of different construction techniques. These are shown on the
enclosed preliminary plans and cross sections (reduced to 8%2 x 11").
Note that many of the reaches of this creek will be improved through the use of "soft" solutions --- laid
back slopes with erosion control blankets and stabilized with various plantings. We propose the use of
seeded mixes, live staking and planting of tree saplings. In areas where "hard" improvements are
required (near bridges, to save mature trees, channel bends and at the toe of bank), we will be placing
limited amounts of class 1 rip-rap. Grading will include a balanced design of both cut and fill sections.
Planting information is further detailed in the project's special provisions. Erosion control will be used in
all construction zones per state requirements.
Though not explicitly shown on the preliminary plans at this time, we propose to create habitat
enhancements for fish and aquatic life similar to those in the enclosed photographs. Due to the recent
rainstorms and flooding, we will conduct a field walk to determine the most suitable locations for these
structures. Specific planting criteria for grass seed, buffers, bushes, live stakes and hardwood trees has
been developed and will be further defined subsequent to the next field walk. After stabilizing the
streambanks, efforts will be on creating riffle pools, varying low-flow channel geometry, placing boulder
clusters, etc. per the attached details.
We are working with Mecklenburg County Department of Environmental Protection personnel to keep
them apprised of our plans and have active monitoring programs to obtain data before, during and after
construction for various living organisms. This data can then be used as a yardstick to measure the
positive benefit that this project will provide. More information on this program can be obtained from
Tony Roux at 704-3336-5500.
Please review the enclosed materials (plans, special provisions, photographs of recently completed Little
Sugar Creek at Huntingtowne Farms Park project) so that we may obtain a NATIONWIDE 13
STREAMBANK ALTERATION PERMIT from your office at the earliest possible time. Concurrently we are
applying to NCDEHNR for review and approval of A SEDIMENTATION AND EROSION CONTROL
PERMIT and a 401 WATER QUALITY CERTIFICATION and also to the US FISH AND WILDLIFE
SERVICE. We are forwarding via e-mail electronic photographs of other recently completed projects
indicating our use of the above-described methods.
d.,msworddocumentslusece k.doc To report drainage problems: 336-RAIN
Printed on recycled paper.
Fees for this project will be paid by this office. Please advise us of the amount(s) required. The
engineering consultant on this project is Gannett Fleming --- Jesse Hite is project principal and may be
reached at 704-375-2438.
Please give me a call at your convenience. I'd like to speak with you about this project and look forward
to your input. I may be reached at 704-336-4328 or send e-mail to [e-mail].
In the near future, you'll also find project specific updates on our website at
http://www.charmeck.nc.us/coeng.
Sincerely
Burg, PE, RL S
Capital Projects Manager
PS - I have three more projects "in the immediate pipeline."
d.Vwword documentstusace k.doc
DEM ID: ACTION ID:
Nationwide Permit Requested (Provide Nationwide Permit ft
JOINT FORM FOR
Nationwide permits that require notification to the Corps of Engineers
Nationwide permits that require application for Section 401 certification
WILMINGTON DISTRICT ENGINEER
CORPS OF ENGINEERS
DEPARTMENT OF THE ARMY
P.O. Box 1890
Wilmington, NC 28402-1890
ATTN: CESAW-CO-E
Telephone [phone]
WATER QUALITY PLANNING
DIVISION OF ENVIRONMENTAL MANAGEMENT
NC DEPARTMENT OF ENVIRONMENT, HEALTH,
AND NATURAL RESOURCES
P.O. Box 29535
Raleigh, NC 27626-0535
ATTN: MR. JOHN DORNEY
Telephone [phone]
ONE (1) COPY OF THIS COMPLETED APPLICATION SHOULD BE SENT TO THE CORPS OF ENGINEERS.
SEVEN (7) COPIES SHOULD BE SENT TO THE N.C. DIVISION OF ENVIRONMENTAL MANAGEMENT.
PLEASE PRINT.
1. Owners Name: Mecklenburg County
2. OwnersAddress• 70.0 N. Tryon Street, Charlotte, NC 28202
3. Owners Phone Number (Home):
(Work): 704-336-3733
4. If Applicable: Agent's name or responsible corporate official, address, phone number-
Andrew A. Burg, PE, LS - Project Manager, 704-336-4328
5. Location of work (MUST ATTACH MAP). County: Mecklenburg
Nearest Town or City:
Charlotte
Specific Location *(Include road numbers, landmarks, etc.): Irwin Creek from its intersection w i t Y:
West Blvd. downstream to its intersection with Clanton Rd.
6. Name of Closest S tream/River: Irwin /Sugar Creek
7. River Basin:
Catawba.
8. Is this project located in a watershed classified as Trout, SA, HQW, ORW, WS I, or WS II? YES [ J NO [x]
9. Have any Section 404 permits been previously requested for use on this property? YES [ ] NO [x]
If yes, explain.
10. Estimated total number of acres of waters of the U.S., including wetlands, located on project site: 9.3 a c .
11. Number of acres of waters of the U.S., including wetlands, impacted by the proposed project:

0.7 Ac.
Drained 0 Ac.
.
Flooded: 0 Ac.
Excavated: 0.9 Ac.
Total Impacted: 1.6 Ac.
FIGURE 1
LOCATION OF PROJECT AREA
(NOT TO SCALE)
Gannett Fleming
ENGINEERS AND PLANNERS
Streambank Stabilization of Irwin Creek
West Boulevard to Clanton Road
Aquatic Habitat Improvement Techniques
Method
BOULDER CLUSTER
Several large boulders are placed
in a niffie to create stru=ral
complMW indudng eddies and
=aA pools. used as tearing areas
by salnonids and other fish.
Boulders may also be placed
singly in a random fashion. This
method re4uires mvrcnal
rttaintenance
Description
Notes

t. Clusters are comprised of 35 ba?ideis.
2 The clusters should be Margelar and placed in the downstream
half of a Jong riffle or glide.
3. Boulders should not be placed in pools.
4. Clraters placed in the same stream section should be at least 113
of the stream width apart
5. Boulders are most effective in wide, shallow, high velodty streams
with gravel or nrbtrle bonomrs.
6. Clraters can be placed in deeper areas to cause undercutting and
increase cover.
7. Height of boulders is determined by the desired habitat ettects.
S. Boulders must heavy enough to resist movement by rapid
streamfows.
1Q?

V4/
???
01
0
Watershed Restoration SourceBook Page - 115 ??
Method
Rock. GASION OR
LOG.FRAYE
oFFLE TORS
Aquatic Habitat Improvement Techniques
Description Notes
Deflectors shouild not be installed in unstable foodplains or b(-aided
1
Defectors are used to narrow and .
channels and are best suited for iow gradient, meandering
deepen streams, encourage
mea9, form pods, increase
banks.
eroding
cover and protect streams. in the lower half of 10119 rifle ShoW be constructed
2
s
s
riangular i
f?fleceors are triangular in shape
t ons prevent baGtMra u
s
ec
than 30 to 45
hould tam an angle not 9
and may be eonstrtrcmd from rock.
d 3. The defeotas s
? ?? meander
degrees with the streamtbank. conforming
ing on
gabion or logs. Depen to water the smaller the
of the stream The greater the velocity
stream conditions. these structtues
can be used singly or in series. At Woe of deflection. to mew low water
should be above
The top level of the de
4
least three defectors should be
constructed in a series for best n
?t
.
over it during No
level, yet Jaw enough
results. flows.
e filled with
fram
5
Log frame defectors consist of a triangular b9
.
fitly planed rook. The logs should be anchored at least 1.8 m (6
ft) iota the bank and segued to the stream bottom using 1-1.5 m
(3.35 ft) rods.
6. The point of connections to the over bank should be armored with
rip.rap to prevent washout.
7. The bank opposite tiro defector may also need np'rap to protect it
from erosion.
8. Gabion defectors should be imbedded into the stream bottom at
least one•haff of their total height be inse? into the bed to
9. Willow and other riparian species may
give a more natural appearance.
Gabion Atricdor
n
43w
0.5w
.r?
?wu
?;%our
Log.Frame Dencctor
46? - ? O
Scgt?

Rock Deflector 40

Watershed Restoration SourceBook - i13

WWIG
Aquatic Habitat improvement Techniques
Method Description
CHANNEL Charnel corstn4bors are essentially
CONSTRICTORS two deflectors on opposite sides of
Ong Deflectors) the stream. They are designed to
narrow and deepen the dunnel
thereby aeating pools to apme
fish rearing habitat Ba"ater,
rlpmj from the a nstrucoon will
muse small gravel deposits to form
upstream. frnprovng spawning
habitat for fish. Corstri=m may
be constructed of rock gabiors or
logs-
Notes
1. Design criteria are very undar to those used for deflectors.
2. Constrictors should reduce stream width by about 25X
3. At the midpoint of the structure, the constrictor should be roughly
the height of expected high flow.
4. ff cortstrietor 'are installed in series they should beat least 5
strearn widths from each other.
5. The constrictors should be well seaued into the strvambank and
bofsotrn
6. Banks downs" = of the structure should be protected against
possible erosion.
7. Opposing deflectors should not constrict the stream more than half
to charnel width and should only be installed in straight sections.
?J
Seour+ .?er.
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