20191156 Ver 1_PCN Form Submission_20190829

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02*10n of Water R"Ourc"
Pre -Construction Notification (PCN) Form
September 29, 2018 Ver 3
Initial Review
Has this project met the requirements for acceptance into the review process?*
r Yes
r No
Is this project a public transportation project?*
r Yes r No
Change only if needed.
BIMS # Assigned *
Version#*
20191156
1
Is a payment required for this project?*
* No payment required
What amout is owed?*
* Fee received
r $240.00
r Fee needed - send electronic notification
r $570.00
Reviewing Office* Select Project Reviewer*
Asheville Regional Office - [phone] Andrew Moore:eads\awnnoore3
Information for Initial Review
1a. Name of project:
Mitchell Branch Restoration
1a. Who is the Primary Contact?*
Andrew Bick
1 b. Primary Contact Email:*
andrevv@headv,raters-eng.com
Date Submitted
8/29/2019
Nearest Body of Water
Mitchell Branch
Basin
French Broad
Water Classification
C; Tr
Site Coordinates
Latitude:
35.923001
A. Processing Information
County (or Counties) where the project is located:
Yancey
Is this project a public transportation project?*
r Yes r No
Longitude:
-82.299751
1a. Type(s) of approval sought from the Corps:
V Section 404 Permit (wetlands, streams and waters, Clean Water Act)
F Section 10 Permit (navigable waters, tidal waters, Rivers and Harbors Act)
1 b. What type(s) of permit(s) do you wish to seek authorization?
P Nationwide Permit (NWP)
F- Regional General Permit (RGP)
r- Standard (IP)
1c. Primary Contact Phone:*
[phone]

1c. Has the NWP or GP number been verified by the Corps?
r Yes r No
Nationwide Permit (NWP) Number:
NWP Numbers (for multiple NWPS):
1d. Type(s) of approval sought from the DWR:
P 401 Water Quality Certification - Regular
F Non -404 Jurisdictional General Permit
F Individual Permit
27 - Restoration
1e. Is this notification solelyfor the record because written approval is not required?
For the record only for DWR 401 Certification:
For the record only for Corps Permit:
F 401 Water Quality Certification - Express
F Riparian Buffer Authorization
1f. Is this an after -the -fact permit application?*
r Yes r No
1g. Is payment into a mitigation bank or in -lieu fee program proposed for mitigation of impacts?
r Yes r No
19. Is payment into a mitigation bank or in -lieu fee program proposed for mitigation of impacts?
r Yes r No
Acceptance Letter Attachment
1h. Is the project located in any of NC's twenty coastal counties?
r Yes r No
1j. Is the project located in a designated trout watershed?
O Yes r No
B. Applicant Information
1d. Who is applying for the permit?
Q Owner r Applicant (other than owner)
1e. Is there an Agent/Consultant for this project?
C Yes r No
2. Owner Information
2a. Name(s) on recorded deed:
Yancey County
2b. Deed book and page no.:
179/279; 114/516
2c. Responsible party:
Ms. Lynn Austin
2d. Address
Street Address
110 Town Square
Address Line 2
Room 11
city
Burnsville
Postai / Zip Code
28714
2e. Telephone Number:
[phone]
2g. Email Address:*
Lyn [e-mail]
C. Project Information and Prior Project History
1. Project Information
State / Province / R icn
NC
Country
USA
2f. Fax Number:
[phone]
r Yes r No
rYes rNo

1b. Subdivision name:
(if appropriate)
1c. Nearest municipality/town:
Burnsville
2. Project Identification 1
2a. Property Identification Number:
082010279370000
2c. Project Address
Street Address
101 Mitchell Branch Road
Address Line 2
City
Burnsville
Rsta / Zip Code
28714
3. Surface Waters
3a. Name of the nearest body of water to proposed project:*
Mitchell Branch
3b. Water Resources Classification of nearest receiving water:*
C; Tr
3c. What river basin(s) is your project located in?*
French Broad
3d. Please provide the 12 -digit HUC in which the project is located.
060101080202
4. Project Description and History
2b. Property size:
2.18
State / Ftwince / Pegzm
NC
Cbuntry
USA
4a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this application:*
The project reach of Mitchell Branch flows through the county's Ray -Cort Park. The upstream end of the reach is forested, with passive park uses. A footbridge marks the upstream end
of the restoration work. Downstream from the footbridge, park features include a picnic shelter, basketball court, maintenance building and parking lot on the left bank/floodplain. A
playground and skate park are present on the right bank/floodplain. Two existing culverts cross the creek over the downstream half of the reach. Mitchell Branch at the site drains a
440 -acre watershed with mainly forest and low density residential land uses.
4b. Have Corps permits or DWR certifications been obtained for this project (including all prior phases) in the past?*
r Yes r No r Unknown
4d. Attach an 81/2 X11 excerpt from the most recent version of the USGS topographic map indicating the location of the project site. (for DWR)
Burnsville 2016 Quad.pdf
295.77KB
4e. Attach an 8 1/2 X11 excerpt from the most recent version of the published County NRCS Soil Survey map depicting the project site. (for DWR)
Ray-Cort_Soil_Map.pdf 658.4KB
4f. List the total estimated acreage of all existing wetlands on the property:
4g. List the total estimated linear feet of all existing streams on the property
770
4h. Explain the purpose of the proposed project:*
The objectives of the project include:
Restoring the channel profile where space allows in order to improve aquatic habitats;
• Removing a levee on the left bank in order to promote stream to floodplain connections;
Establishing native riparian trees and shrubs on the banks and in buffers to reinforce the bank soils and provide shade on the stream; and
• Providing an environmental education opportunity for the community.
4i. Describe the overall project in detail, including indirect impacts and the type of equipment to be used:*
The proposed restoration project, detailed in the attached plans, involves the following:
Construction of about 200 LF of new, off-line stream channel with grade control structures and bioengineering bank protection;
• Bank sloping and installation of in -stream grade control structures elsewhere on the project reach where the channel will remain in its current alignment; and
• Buffer planting where space allows.
A pump -around flow diversion will be used to de -water the channel when in -stream work in ongoing and when flow is turned from the original channel to the new, off-line channel.
Equipment to be used will include track mounted excavators, dump trucks, hand tools, and the diversion pump and associated hoses and coffer dams. Work will be performed from the
top of bank as much as possible. The eAsting culvert near station 13+80 will be used as an equipment crossing.
The length of the stream impact is estimated at 400 LF.
4j. Please upload project drawings for the proposed project.

mitchell branch restoration plans for permits 082919.pdf
5. Jurisdictional Determinations
9.55MB
5a. Have the wetlands or streams been delineated on the property or proposed impact areas?*
r Yes r No r Unknown
Comments:
no wetlands were observed and soils map does not indicate hydric soils on-site
5b. If the Corps made a jurisdictional determination, what type of determination was made?
r Preliminary r Approved r Not Verified r Unknown r N/A
Corps AID Number
5c. If 5a is yes, who delineated the jurisdictional areas?
Name (if known):
Agency/Consultant Company:
Other:
5dl. Jurisdictional determination upload
6. Future Project Plans
6a. Is this a phased project?*
r Yes r No
Are any other NWP(s), regional general permit(s), or individual permits(s) used, or intended to be used, to authorize any part of the proposed projector related activity?
No
D. Proposed Impacts Inventory
1. Impacts Summary
1a. Where are the impacts associated with your project? (check all that apply):
F Wetlands 17 Streams -tributaries r Buffers
r- Open Waters r Pond Construction
3. Stream Impacts
3a. Reason for impact (?) 3b.lmpact type * 3c. Type of impact* 3d. S. name* 3e. Stream Type * 3f. Type of 3g. S. width * 3h. Impact
M Jurisdiction* length*
restoration Permanent Bank Stabilization J
Mitchell Branch Perennial Both 1;;1
(linear feet)
31. Total jurisdictional ditch impact in square feet:
0
31. Total permanent stream impacts: 31. Total temporary stream impacts:
400 0
31. Total stream and ditch impacts:
400
3j. Comments
E. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing the project:
The impacts will benefit the aquatic resources at the site. The restoration measures were designed based on natural channel design techniques and
make use of natural materials, biodegradable coir fiber matting and native plant species.
1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques:
All construction equipment and materials (stone, seed and coir matting) will be mobilized to the site before work begins. Equipment will be maintained
to be free of leaks and fueling will be performed well away from the stream. Base flow will be diverted using a pump -around in order to limit
downstream turbidity, and work will be staged during times of low flow. Work will also be staged such that no more stream bank and bed are disturbed
than can be fully stabilized by the end of that work day.

2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for impacts to Waters of the U.S. or Waters of the State?
f Yes r No
2b. If this project DOES NOT require Compensatory Mitigation, explain why:
The proposed impacts are beneficial to the natural resources.
F. Stormwater Management and Diffuse Flow Plan (required by DWR)
1. Diffuse Flow Plan
1a. Does the project include or is it adjacent to protected riparian buffers identified within one of the NC Riparian Buffer Protection Rules?
r Yes r No
If no, explain why:
the site is not located in an area with buffer protection rules.
2. Stormwater Management Plan
2a. Is this a NCDOT project subject to compliance with NCDOT's Individual NPDES permit NCS000250?*
r Yes r No
2b. Does this project meet the requirements for low density projects as defined in 15A NCAC 02H .1003(2)?
r Yes r No
Comments:
A SMP is not required and antidegradation calcs are not required because the work will not add impervious area to the site.
G. Supplementary Information
1. Environmental Documentation
1a. Does the project involve an expenditure of public (federal/state/local) funds or the use of public (federal/state) land?*
r Yes r No
u
1b. If you answered "yes" to the above, does the project require preparation of an environmental document pursuant to the requirements of the National or State (North Carolina)
Environmental Policy Act (NEPA/SEPA)? *
r Yes r No
Comments:*
If required, a categorical exclusion can be prepared.
2. Violations (DWR Requirement)
2a. Is the site in violation of DWR Water Quality Certification Rules (15A NCAC 2H .0500), Isolated Wetland Rules (15A NCAC 2H .1300), or DWR Surface Water or Wetland Standards or
Riparian Buffer Rules (15A NCAC 2B.0200)?*
r Yes r No
3. Cumulative Impacts (DWR Requirement)
3a. Will this project result in additional development, which could impact nearby downstream water quality?*
r Yes r No
3b. If you answered "no," provide a short narrative description.
The proposed restoration work is expected to benefit downstream water quality.
4. Sewage Disposal (DWR Requirement)
4a. Is sewage disposal required by DWR for this project?*
r• Yes r No r N/A
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
Sa. Will this project occur in or near an area with federally protected species or habitat?*
G Yes r• No
5b. Have you checked with the USFWS concerning Endangered Species Act impacts?*
r Yes r No
5c. If yes, indicate the USFWS Field Office you have contacted.
Asheville

5d. Is another Federal agency involved?*
r Yes r No
What Federal Agency is involved?
USFWS
5e. Is this a DOT project located within Division's 1-8?
r Yes r No
5f. Will you cut any trees in order to conduct the work in waters of the U.S.?
r Yes r No
5g. Does this project involve bridge maintenance or removal?
r Yes r No
5h. Does this project involve the construction/installation of a wind turbine(s)?*
r Yes r No
r Unknown
51. Does this project involve (1) blasting, and/or (2) other percussive activities that will be conducted by machines, such as jackhammers, mechanized pile drivers, etc.?
r Yes r No
5j. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical Habitat?
USFWS staff are performing Section 7 consultation.
Consultation Documentation Upload
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as an Essential Fish Habitat?*
r Yes r No
6b. What data sources did you use to determine whether your site would impact an Essential Fish Habitat?*
NOAA fisheries website.
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal governments have designated as having historic or cultural preservation status?*
r Yes r No
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?*
NC SHPO website. Plans have been submitted to NC SHPO for review.
7c. Historic or Prehistoric Information Upload
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA -designated 100 -year floodplain?*
r Yes r No
8b. If yes, explain how project meets FEMA requirements:
A no -rise flood study is being performed.
8c. What source(s) did you use to make the floodplain determination?*
NC FRIS website
Miscellaneous
Comments
Geomorphic data from a topographic survey in May 2019 are attached along with channel sizing calculations and site photos.
Miscellaneous attachments not previously requested.
supporting data Mitchell Branch Restoration.pdf
ray cort photos.pdf
Signature
*
PF By checking the box and signing below, I certify that:
1.05MB
574.42KB
• I have given true, accurate, and complete information on this form;
• I agree that submission of this PCN form is a "transaction" subject to Chapter 66, Article 40 of the NC General Statutes (the "Uniform Electronic Transactions Act');
• I agree to conduct this transaction by electronic means pursuant to Chapter 66, Article 40 of the NC General Statutes (the "Uniform Electronic Transactions Act');
• I understand that an electronic signature has the same legal effect and can be enforced in the same way as a written signature; AND
• I intend to electronically sign and submit the PCN form.
Full Name:

Andrew Bick
Signature
O/Ima0.10
Date
8/29/2019

Department of the Army
Wilmington District, Corps of Engineers
Attn: Brandee Boggs
151 Patton Avenue 9208
Asheville, NC 28801
-and-
NC DWR, 401 and Buffer Permitting Unit
Attn: Karen Higgins
512 North Salisbury Street
Raleigh, North Carolina 27604
I, the current landowner/managing partner of the property identified below, hereby authorize
Andrew Bick of Headwaters Engineering` PC to act on my behalf as my agent during the
processing of jurisdictional determination requests and permits to impact Wetlands and Water of
the US subject to Federal jurisdiction under Section 404 of the Clean Water Act and/or Section 10
of the Rivers and Harbors Act of 1899. Andrew Bick is authorized to provide supplemental
information as needed at the request of the USACE or DWR.
Additionally, I authorize representatives of the Wilmington District, US Army Corps of Engineers
to enter upon the property herein described for the purposes of conducting onsite investigations and
issuing a determination associated with Wetlands and Waters of the US subject to Federal
jurisdiction under Section 404 of the Clean Water Act and/or Section 10 of the Rivers and
Harbors Act of 1899. One property owner of record must accompany any said representative
when the onsite investigation is conducted.
Property Owner of Record: Yancey County
Property Owner Address: 110 Town Square, Room 11, Burnsville, NC 28714
Phone Number: 828-682-3971
Email address: Lynn.Austin(awanceycountync.gov
Property Location:
Owner/Managing pai
Owner/Managing pri
Date:
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Soil Map—Yancey County, North Carolina
(Ray-Cort Park)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/29/2019
Page 1 of 339756003975800397600039762003976400397660039768003977000397540039756003975800397600039762003976400397660039768003977000382300382500382700382900383100383300
382300 382500 382700 382900 383100 383300
35° 55' 50'' N 82° 18' 23'' W35° 55' 50'' N82° 17' 33'' W35° 54' 56'' N
82° 18' 23'' W35° 54' 56'' N
82° 17' 33'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 17N WGS84
0 350 700 1400 2100
Feet
0 100 200 400 600
Meters
Map Scale: 1:8,110 if printed on A portrait (8.5" x 11") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:12,000.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Yancey County, North Carolina
Survey Area Data: Version 16, Sep 10, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Nov 23, 2011—Nov
28, 2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Soil Map—Yancey County, North Carolina
(Ray-Cort Park)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/29/2019
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
BdA Bandana sandy loam, 0 to 3
percent slopes, occasionally
flooded
2.6 0.9%
CeF Chandler-Micaville complex,
50 to 95 percent slopes,
stony
16.9 6.1%
CnC2 Clifton clay loam, 8 to 15
percent slopes, eroded
35.2 12.8%
CnD2 Clifton clay loam, 15 to 30
percent slopes, eroded
47.5 17.2%
CnE2 Clifton clay loam, 30 to 50
percent slopes, eroded
19.8 7.2%
EcD Evard-Cowee complex, central
mountain, 15 to 30 percent
slopes, stony
2.7 1.0%
EcE Evard-Cowee complex, central
mountain, 30 to 50 percent
slopes, stony
7.0 2.5%
FeD2 Fannin sandy clay loam, 15 to
30 percent slopes, eroded
23.9 8.7%
FeE2 Fannin sandy clay loam, 30 to
50 percent slopes, eroded
45.8 16.6%
ScC Saunook sandy loam, 8 to 15
percent slopes, stony
29.3 10.6%
SdD Saunook-Thunder complex, 15
to 30 percent slopes, stony
10.9 3.9%
Ud Udorthents, loamy, stony 7.8 2.8%
UsB Unison loam, 2 to 8 percent
slopes
11.6 4.2%
UsC Unison loam, 8 to 15 percent
slopes
15.0 5.4%
Totals for Area of Interest 275.8 100.0%
Soil Map—Yancey County, North Carolina Ray-Cort Park
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
8/29/2019
Page 3 of 3
SITE
SHEETINDEX
MITCHELL BRANCH RESTORATION
RAY CO RT PARK
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1 : TITLE
2: NOTES AND SYMBOLS
3: PLAN AND PROFILE
4: CONSTRUCTION STAGING PLAN / IMPACTS MAP
5-8: DETAILS
VICINITY MAP
NOT TO SCALE
PRELIMINARY PLANS
NOT FOR CONSTRUCTION
PREPARED FOR:
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PRELIMINARY PLANS
LEGEND
EXISTING
Q
NOTES: NOT FOR CONSTRUCTION
11+00
THALWEG
STREAM CENTERLINE
CONTOUR (1')
TOP OF BANK
— —
PARCELS
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1. NO STREAM WORK SHALL BEGIN UNTIL ALL MATERIAL NEEDED FOR IN -STREAM STRUCTURES AND BANK STABLIZATION
'ar
CONSTRUCTED RIFFLE
SANITARY SEWER & MH
ss ss
BOULDER STEP
zo
ARE BROUGHT TO THE SITE.
-----
BRUSH MATTRESS
TROUT BUFFER
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2. ALL EQUIPMENT SHALL BE CLEANED PRIOR TO MOBILIZATION AND SHALL BE MAINTAINED TO BE FREE OF LEAKS.
RIPARIAN BUFFER
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3. FUELING SHALL BE PERFORMED INA CONTAINED AREAAT LEAST 200 FEET FROM FLOWING WATER.
u
4. USE CULVERT AT STATION 13+80 TO CROSS THE CREEK.
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5. WORK SHALL BE STAGED SUCH THAT NO MORE CREEK BANK IS DISTURBED THAN CAN BE STABILIZED AT THE END OF
0
Q
m
THAT WORK DAY.
3. LEAVE 10' PLUG OF BANK MATERIAL AT UPSTREAM END OF OFF-LINE CHANNEL TO MAINTAIN FLOW IN ORIGINAL CHANNEL
UNTIL OFF-LINE CHANNEL IS FULLY STABILIZED.
4. USE A PUMP -AROUND TO DIVERT FLOW AROUND THE WORK AREA WHEN TURNING FLOW INTO NEW OFF-LINE CHANNEL
AND WHEN IN -CHANNEL WORK IS ONGOING. HARVEST ON-SITE COBBLE FOR IN -STREAM STRUCTURES ONLYAFTER
PUMP -AROUND IS IN PLACE.
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5. TREES, UTILITIES AND OTHER PARK FEATURES SHALL BE PROTECTED IN PLACE UNLESS MARKED FOR REMOVAL.
6. TREES AND LOGS REMOVED DURING GRADING SHALL BE SALVAGED FOR ON-SITE USE AS IN THE PROJECT UNLESS
DIRECTED OTHERWISE. LOGS AND CLEARING DEBRIS NOT USEFUL TO THE PROJECT SHALL BE DISPOSED OFF-SITE.
7. LIVE STAKES AND BRUSH MATERIALS USED IN GEOLIFTS SHALL BE INSTALLED DURING THE DORMANT SEASON, TYPICALLY
DECEMBER THROUGH APRIL.
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DATE: AUGUST 2019
SCALE: AS SHOWN
NOTES AND
SYMBOLS
SHEET 2 OF 8
LEGEND
EXISTING
PROPOSED
11+00
THALWEG
STREAM CENTERLINE
CONTOUR (1')
TOP OF BANK
— —
PARCELS
TOE OF BANK
TREE
'ar
CONSTRUCTED RIFFLE
SANITARY SEWER & MH
ss ss
BOULDER STEP
OVERHEAD ELEC & POWER POLE
-----
BRUSH MATTRESS
TROUT BUFFER
SILT FENCE
SF
RIPARIAN BUFFER
0
0
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DATE: AUGUST 2019
SCALE: AS SHOWN
NOTES AND
SYMBOLS
SHEET 2 OF 8

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PRELIMINARY PLANS Q
NOT FOR CONSTRUCTION
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IMPACT S1: 400 LF -, m �Z o- J
STREAM RESTORATION
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\TEMPORARY TROUT BUFFER IMPACTS �- _ _
LEFT BANK: 400 LF _ _ ' i U Lu
RIGHT BANK: 400 LF
DATE: AUGUST 2019
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SCALE: AS SHOWN
CONSTRUCTION
STAGING PLAN &
IMPACT MAP
SHEET 4 OF 8

BACKFILL ABANDONED CHANNEL
SLOPE TO CONFORM TO ADJACENT GRADE
REMOVE LEVEE ON LEFT BANK
IN,
/
13.5'
1.5' �1
2.5 (TYP)
6.0'
TYPICAL SECTION
5 OFF—LINE RIFFLE
\
— — - 3.5
BACKFILL ABANDONED CHANNEL
SLOPE TO CONFORM TO ADJACENT GRADE
2 TYPICAL SECTION
5 OFF—LINE POOL
�1
} 2 (TYP)
4'+/ -
TYPICAL
'+/ -
TYPICAL SECTION
5 ON—LINE POOL
NOTES
LEGEND 1. TYPICAL SECTIONS DRAWN LOOKING DOWNSTREAM.
2. DISTURBED BANKS SHALL BE ROUGHENED PERPENDICULAR
EXISTING _ _ _ _ _ _ _ TO SLOPE, COVERED WITH 3" LAYER OF TOPSOIL, SEEDED,
MULCHED AND MATTED WITH 780 G/MZ COIR FIBER MATTING.
PROPOSED 3. ADJUST GRADING LIMITS AS NEEDED TO PROTECT EXISTING
TREES ALONG THE TOP OF BANK.
SEED, MATTING, LIVE STAKES
TYP. BOTH BANKS
PRELIMINARY PLANS
NOT FOR CONSTRUCTION
/
16.7' — _--�
2.2' �1
2.5
SEED, MATTING, LIVE STAKES
3.6' y TYP. BOTH BANKS
d
d
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DATE: AUGUST 2018
SCALE: AS SHOWN
TYPICAL
SECTIONS
SHEET 5 OF 8
��'
0
0
a 0'7
W (� t U
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w J
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DATE: AUGUST 2018
SCALE: AS SHOWN
TYPICAL
SECTIONS
SHEET 5 OF 8

PRELIMINARY PLANS
NOT FOR CONSTRUCTION
SE
N POINT, SEE PROFILE
IIX OF CLASS 1 STONE AND
)N -SITE COBBLE
(. HEADER
ELEV. AT TIE -IN ;
APPROX. 1' HIGHER i i \`\, FOOTER ;'O�%�� �-;'p, -
THAN INVERT ELEV. I li f
04
j I EXCAVATED
I SCOUR POOL
I �
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I
I
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(TYP)
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BACKFILL EXTENDS 4' MIN.
I �
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W J
TOE OF BANK (TYP)
STONE BACKFILL NOT
HEADER BOULDER
Q
W z co
PLAN
—-
oZ
TOP OF BANK (TYP)
I
I SHOWN FOR CLARITY
1' MAX.
z
MIX CLASS 1 STONE
FILTER FABRIC
zo
0
(f)
6' +/-
ANCHORED UPSTREAM
OF HEADERS
W
4' MIN.
12" THICK LAYER
CLASS B RIPRAP
Y
SCARIFY SUBGRADE
PRIOR TO STONE PLACEMENT
SECTION FOOTER BOULDER
C) U
zZ of Z
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SECTION A -A'
m Q
2 BOULDER STEP
�-- - - I
Jo
= O/
1 CONSTRUCTED RIFFLE
�
w
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8'+/
6 NTS
U w} w
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Z
' I ANCHOR 4' INTO BANK
(. HEADER
ELEV. AT TIE -IN ;
APPROX. 1' HIGHER i i \`\, FOOTER ;'O�%�� �-;'p, -
THAN INVERT ELEV. I li f
04
j I EXCAVATED
I SCOUR POOL
I �
NOTES:
1. BOULDERS SHALL BE DURABLE STONE,
MIN. 2'X3'X3' AND RELATIVELY FLAT.
2. DIMENSIONS AND NUMBER OF DATE: AUGUST 2019
BOULDERS MAY BE ADJUSTED BASED ON
SCALE: AS SHOWN
FIELD CONDITIONS.
DETAILS
SHEET 6 OF 8
k
PLAN
a E L0
U
w U
0
1'
Q i Z
(TYP)
BACKFILL EXTENDS 4' MIN.
W � U
W J
HEADER BOULDER
Q
W z co
PLAN
—-
2 w co
1' MAX.
z
MIX CLASS 1 STONE
FILTER FABRIC
WITH ON-SITE GRAVEL AND COBBLE
ANCHORED UPSTREAM
OF HEADERS
18" M!!,_A R COMPACTION
4' MIN.
12" THICK LAYER
CLASS B RIPRAP
Y
SCARIFY SUBGRADE
PRIOR TO STONE PLACEMENT
SECTION FOOTER BOULDER
C) U
zZ of Z
<Oaw
SECTION A -A'
m Q
2 BOULDER STEP
Jo
= O/
1 CONSTRUCTED RIFFLE
�
z
6 NTS
6 NTS
U w} w
~�ofm
NOTES:
1. BOULDERS SHALL BE DURABLE STONE,
MIN. 2'X3'X3' AND RELATIVELY FLAT.
2. DIMENSIONS AND NUMBER OF DATE: AUGUST 2019
BOULDERS MAY BE ADJUSTED BASED ON
SCALE: AS SHOWN
FIELD CONDITIONS.
DETAILS
SHEET 6 OF 8

PRELIMINARY PLANS
NOT FOR CONSTRUCTION
MATTING SHALL BE
780 G/M2 COIR
STEEL T -POST —
FILTER FABRIC
WITH WIRE BACKING —
COMPACTED BACKFILL
RUNOFF
8" -
TOP OF BANK
1' MIN. F MATTING PLACED FLUSH WITH BANK SURFACE, LAP
OVER DOWN STREAM / DOWN SLOPE SEAMS
12" WOOD STAKE PLACED IN
3' O.C. DIAMOND PATTERN
MATTING ANCHORED 1'
BELOW STREAM BED
REMOVE ALL DEBRIS,
SCARIFY SURFACE, PLACE
TOPSOIL AND SEED/MULCH
BEFORE PLACING MATTING
1 EROSION CONTROL MATTING
7 NTS
18" MIN.
CREEK
SIDE
24" MIN.
8' MAX.
STEEL T -POST
FILTER FABRIC WITH
WIRE BACKING
PROFILE
4" 11L ► NOTES:
1. SILT FENCE SHALL BE PLACED ON STREAM
SIDE OF ALL STOCKPILES.
SECTION 2. SILT FENCE SHALL BE REMOVED UPON
COMPLETION OF EARTHWORK.
2 SILT FENCE
7 NTS
NON -WOVEN SILT BAG
10' MIN. FROM STREAM
CLASS B S ONE PAD
OR PALLET
SILT BAG
DEWATERING PUMP SILT BAG ON STONE PAD,
FAS NEEDED SEE DETAILABOVE
COFFER DAM; CLASS B STONE
W/ PLASTIC SHEETING
1' DEEP
SETTLING POOL
DIVERSION PUMP
CAPACITY= 150% OF
BASE FLOW
FLOW
MAX DEPTH -1'
3'
i?3-1•»109
PROTECT EXIST.
X
BANK VEGETATION
7� �� Q FOR ADD'L FILTER
ll)
WORKAREA*
TOE OF BANK (TYP)
TOP OF BANK (TYP)
VARIES - ON-SITE COBBLE
SPLASH PAD
*NOTE:
WORK AREA SHALL BE STABILIZED BY
THE END OF EACH WORK DAY.
TOP OF BANK BANK TO BANK
MAX DEPTH
STREAM BOTTOM +
Lftriogralkil
I
Q
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HDPE SHEETING WITH 6" OF COFFER DAM
ON-SITE COBBLE OVERLAY;
USE SAND BAGS AT BASE
AS NECESSARY DATE: AUGUST 2019
3 PUMP -AROUND SCHEMATIC SCALE: AS SHOWN
7NTS DETAILS
SHEET 7 OF 8
oc" Q
-�
0
0
a- 0 �
W 0) U
Q z o
z
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WJ
2 w m
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LU c)U)
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HDPE SHEETING WITH 6" OF COFFER DAM
ON-SITE COBBLE OVERLAY;
USE SAND BAGS AT BASE
AS NECESSARY DATE: AUGUST 2019
3 PUMP -AROUND SCHEMATIC SCALE: AS SHOWN
7NTS DETAILS
SHEET 7 OF 8

RIPARIAN SEED MIX
Seeding Rate = 20 Ib/acre
Mulching: wheat or oat straw mulch applied at 2 tons/acre
Common Name
Scientific Name
Percentage
Deer Tongue
Panicum clandestinum
20
Little Bluestem
Schizachyrium scoparium
20
Virginia Wildrye
Elymus virginicus
20
Soft Rush
Juncus effusus
10
River Oats
Chasmanthium latifolium
10
Black-eyed Susan
Rudbeckia hirta
10
Spotted Bee Balm
Monarda punctata
5
Lance -leaved Coreopsis
Coreopsis lanceolata
5
TEMPORARY SEED MIX
Rate (Ib/acre)
Rate (Ib/acre) Applied
Application Dates
Common Name
Scientific Name
Applied
w/ Riparian Mix
Separately
August 15 to May 1
Rye Grain
Secale cereale
120
60
May 1 to August 15
Pearl Millet
Pennisetum glaucum
40
20
SEED MIXES
8
IN. 2 NODES ABOVE GRADE
LIVE STAKE
TIN DIAMOND PATTERN
HARD SOIL OR STONE MAY
BE PRESENT SEE NOTE 1
n r 2' TO FIRST ROW
3 NODES MIN.
BASEFLOW W.S.
SECTION
NOTES:
1. FORM PILOT HOLE THROUGH HARD SOIL OR STONE TO
PREVENT DAMAGE TO STAKE.
2. LIVE STAKE MIX TO INCLUDE AT LEAST TWO OF THE
FOLLOWING SPECIES: SILKY DOGWOOD, SILKY WILLOW,
ELDERBERRY, NINEBARK, BUTTONBUSH.
24" MIN.
TOP CUT AT 150
AFTER
INSTALLATION
BUDS POINTED
UPWARD
1/2" TO 2"
BASE CUT
AT 45 DEG.
LIVE STAKE DETAIL
2 LIVE STAKING
g NTS
LNOT
LIMINARY PLANS
FOR CONSTRUCTION
d
d
Q
0
0
a 0
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Qz z°
o:
W U
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U
z
2
Z Z of Z
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1 Q 0 >
W H fA
Z
~�Wm
DATE: AUGUST 2019
SCALE: AS SHOWN
DETAILS
SHEET 8 OF 8

2395
2400
2405
2410
2415
2420
2425
2430
2435
0 100 200 300 400 500 600 700Elevation (ft)Channel Distance (ft)
Mitchell Branch
bed water srf bankfull x-section riffle crest pool run glide TP1 ------
Bankfull Dimensions Flood Dimensions Materials
13.2 x-section area (ft.sq.) 16.0 W flood prone area (ft) 52 D50 Bed (mm)
8.8 width (ft) 1.8 entrenchment ratio 160 D84 Bed (mm)
1.5 mean depth (ft) --- low bank height (ft) 186 threshold grain size (mm):
2.0 max depth (ft) --- low bank height ratio
11.1 wetted parimeter (ft)
1.2 hyd radi (ft)
5.8 width-depth ratio
Bankfull Flow Flow Resistance Forces & Power
7.6 velocity (ft/s) 0.050 Manning's roughness 5.1 channel slope (%)
99.4 discharge rate (cfs) 0.27 D'Arcy-Weisbach fric. 3.78 shear stress (lb/sq.ft.)
1.22 Froude number 5.3 resistance factor u/u* 1.40 shear velocity (ft/s)
2.9 relative roughness 36 unit strm power (lb/ft/s)
90
90.5
91
91.5
92
92.5
93
93.5
94
94.5
95
0 2 4 6 8 10 12 14 16 18Elevation
Width
Upstream Reference Reach - Mitchell Branch
Bankfull Dimensions Flood Dimensions Materials
32.6 x-section area (ft.sq.) 88.0 W flood prone area (ft) 52 D50 Bed (mm)
16.1 width (ft) 5.5 entrenchment ratio 160 D84 Bed (mm)
2.0 mean depth (ft) --- low bank height (ft) 283 threshold grain size (mm):
2.5 max depth (ft) --- low bank height ratio
18.0 wetted parimeter (ft)
1.8 hyd radi (ft)
7.9 width-depth ratio
Bankfull Flow Flow Resistance Forces & Power
10.0 velocity (ft/s) 0.050 Manning's roughness 5.1 channel slope (%)
325.1 discharge rate (cfs) 0.24 D'Arcy-Weisbach fric. 5.75 shear stress (lb/sq.ft.)
1.31 Froude number 6.2 resistance factor u/u* 1.72 shear velocity (ft/s)
3.9 relative roughness 64 unit strm power (lb/ft/s)
2836
2837
2838
2839
2840
2841
2842
2843
0 10 20 30 40 50 60 70 80 90 100Elevation
Width
0 + 92 Mitchell Branch, Pool
Bankfull Dimensions Flood Dimensions Materials
24.0 x-section area (ft.sq.) 63.0 W flood prone area (ft) 52 D50 Bed (mm)
24.8 width (ft) 2.5 entrenchment ratio 160 D84 Bed (mm)
1.0 mean depth (ft) --- low bank height (ft) 144 threshold grain size (mm):
1.9 max depth (ft) --- low bank height ratio
26.1 wetted parimeter (ft)
0.9 hyd radi (ft)
25.6 width-depth ratio
Bankfull Flow Flow Resistance Forces & Power
6.4 velocity (ft/s) 0.050 Manning's roughness 5.1 channel slope (%)
152.7 discharge rate (cfs) 0.30 D'Arcy-Weisbach fric. 2.93 shear stress (lb/sq.ft.)
1.17 Froude number 4.8 resistance factor u/u* 1.23 shear velocity (ft/s)
1.8 relative roughness 19.6 unit strm power (lb/ft/s)
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
0 10 20 30 40 50 60 70 80 90Elevation
Width
2 + 21 Mitchell Branch, Pool
Bankfull Dimensions Flood Dimensions Materials
16.0 x-section area (ft.sq.) 16.0 W flood prone area (ft) 52 D50 Bed (mm)
11.1 width (ft) 1.4 entrenchment ratio 160 D84 Bed (mm)
1.4 mean depth (ft) --- low bank height (ft) 202 threshold grain size (mm):
2.0 max depth (ft) --- low bank height ratio
12.4 wetted parimeter (ft)
1.3 hyd radi (ft)
7.7 width-depth ratio
Bankfull Flow Flow Resistance Forces & Power
8.0 velocity (ft/s) 0.050 Manning's roughness 5.1 channel slope (%)
128.1 discharge rate (cfs) 0.27 D'Arcy-Weisbach fric. 4.12 shear stress (lb/sq.ft.)
1.24 Froude number 5.5 resistance factor u/u* 1.46 shear velocity (ft/s)
2.7 relative roughness 37 unit strm power (lb/ft/s)
2815
2816
2817
2818
2819
2820
2821
2822
0 10 20 30 40 50 60 70 80 90Elevation
Width
5 + 32 Mitchell Branch, Riffle
Regional Curve Estimates
Area Calculation Riffle DA (sq. mi.) 0.69
NC Mountains (area) 17
Right Bank Slope, x:1 2.5 NC Mountains (discharge) 76
Left Bank Slope, x:1 2.5 NC Mountains width 16.6
3.75 Max Depth (ft) 1.5
Bottom Width (ft) 6 NC rural Piedmont (area) 17
Area 14.625 NC rural Piedmont (discharge) 68
Bankfull Width (ft) 13.5 NC rural Piedmont width 10.1
Bankfull Depth (ft) 1.08
W/D ratio 12.46 USGS 2 year discharge
NC Hydro Region 2 82
Discharge Calculation overall reach
Q = 1.49/n R2/3 s1/2 A
WP (ft) 14.07775
R (ft) 1.038874 pebble count
design slope 0.05 d84 = 160 mm
Channel n 0.05 d95 = 295 mm
Q (cfs) 100
gRs = 3.24 psf
largest particle from Shields = 361 mm
14.2 in. <-----
CONSTRUCTED RIFFLES HAVE D50 OF 10"; D100 OF 17" (Class 1 Rip Rap)
Area Calculation - Offline Pool
Left Bank Slope, x:1 3.5
Right Bank Slope, x:1 2.5 width ratio = 1.24
Max Depth (ft) 2.2 depth ratio = 2.03
Bottom Width (ft) 3.6 area ratio = 1.53
Area 22.44
Bankfull Width (ft) 16.8 width at riffle grade 7.8
pt bar tob o/s 9.5
outside bank tob o/s 7.3
TYPICAL SECTION DESIGN - MITCHELL BRANCH
Type
D16 16 mean 50.6 silt/clay 0%
D35 34 dispersion 3.2 sand 2%
D50 52 skewness -0.01 gravel 56%
D65 76 cobble 37%
D84 160 boulder 5%
D95 260
Size (mm) Size Distribution
silt/clay sand gravel cobble boulder
0
2
4
6
8
10
12
14
16
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.01 0.1 1 10 100 1000 10000 number of particlespercent finer thanparticle size (mm)
Bed Surface Pebble Count, Mitchell Branch
cumulative %# of particles
Site Photographs- Mitchell Branch Restoration

Looking NE at upstream reach; note levee to be partially removed on left descending bank

Looking upstream from culvert near mid-reach

Looking downstream at downstream reach