20200421 Ver 1_PCN Form Submission_20200326

DWR
Olrlslon of Water Resources
Pre -Construction Notification (PCN) Form
September 29, 2018 Ver 3
Initial Review
Has this project met the requirements for acceptance in to the review process?*
r Yes
r No
Is this project a public transportation project?*
G Yes r No
Change only if needed.
BIMS # Assigned *
Version#*
20200421
1
Is a payment required for this project?*
r No payment required
What amout is owed?*
r Fee received
r $240.00
r Fee needed - send electronic notification
r $570.00
Reviewing Office * Select Project Reviewer*
Asheville Regional Office - [phone] Amy Annino:eads\amannino
Information for Initial Review
1a. Name of project:
Thorps Creek Aquatic Organism Passage Improvements & Road Crossing Replacement
1a. Who is the Primary Contact?*
Brady N. Dodd
1b. Primary Contact Email:*
[e-mail]
Date Submitted
3/26/2020
Nearest Body of Water
Thorpe Creek
Basin
Catawba
Water Classification
C, Tr, ORW
Site Coordinates
Latitude: Longitude:
35.99244-81.76168
A. Processing Information
County (or Counties) where the project is located:
Caldwell
Is this project a public transportation project?*
r Yes r No
1a. Type(s) of approval sought from the Corps:
W Section 404 Permit (wetlands, streams and waters, Clean Water Act)
r Section 10 Permit (navigable waters, tidal waters, Rivers and Harbors Act)
1b. What type(s) of permit(s) do you wish to seek authorization?
* Nationwide Permit (NWP)
* Regional General Permit (RGP)
7 Standard (IP)
1c. Primary Contact Phone:*
[phone]
V

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:
W 401 Water Quality Certification - Regular
r Non-404 Jurisdictional General Permit
r Individual Permit
27 - Restoration
le. Is this notification solely for the record because written approval is not required?
For the record only for DWR401 Certification:
For the record only for Corps Permit:
F 401 Water Quality Certification - E)press
r 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
1g. 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
Applicant Information
1d. Who is applying for the permit?
W Owner r Applicant (other than owner)
le. Is there an Agent/Consultant for this project?*
r Yes r No
2. Owner Information
2a. Name(s) on recorded deed:
US Forest Service, Allen Nicholas, Forest Supervisor
2b. Deed book and page no.:
2c. Responsible party:
2d.Address
Street Address
160 Zillicoa St
Address Line 2
aty
Asheville
Postal / Zip Code
28801
2e. Telephone Number:
[phone]
2g. Email Address:*
[e-mail]
4. Agent/Consultant (if applicable)
State / Province / Region
NC
Country
USA
2f. Fax Number:
r Yes r No
r Yes r No
4a. Name:
Brady Dodd

4b. Business Name:
4c.Address
Street Address
160 Zillicoa St.
Address tine 2
CKY
Asheville
Postal / Zip Code
28801
4d. Telephone Number:
[phone]
4f. Email Address:*
[e-mail]
Agent Authorization Letter*
DelegationOf Authority2016_Signed.pdf
State / Province / Region
NC
Country
USA
4e. Fax Number:
397.51 KB
C. Project Information and Prior Project History C^)
1. Project Information
1b. Subdivision name:
(d appropriate)
1c. Nearest municipality/ town:
Morganton, NC
2. Project tt Identification
2a. Property Identification Number:
2c. Project Address
Street Address
Address Line 2
City
Postal / Zip Code
3. Surface Waters
3a. Name of the nearest body of water to proposed project:*
Thorps Creek
3b. Water Resources Classification of nearest receiving water:*
C, Tr, ORW
3c. What river basin(s) is your project located in?*
Catawba
3d. Please provide the 12-digit HUC in which the project is located.
030501010502
4. Project Description and History
2b. Property size:
State / Province / Ibgion
Country
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:*
Thorps Creek is a tributary to Wilson Creek in the Catawba River Basin, and is classified by the state as an Outstanding Resource Water. This reach of Thorps Creek, flowing through
the Mortimer Campground, has been a reach of concern due to erosion and the lack of aquatic organism passage. The lower section of stream channel was rehabilitated in 2017 using
a natural stream design. In 2018 this watershed experienced a large storm which made several adjustments to structures and bed elevations. As a result, the same reach is proposed
for repair of structures and restoration of habitat. This work is permitted by the 2016 USACE and NCDWR (SAW-2016-00864) and planned for construction in 2020.
Upstream of the stream repair work the road accesses the upper portion of the campground, crossing Thorps Creek with a concrete vented ford. The vented ford is an impediment to
aquatic organism movement, as well as movement of channel substrate, woody debris and streamflow. The culverts in the ford frequently plug with woody debris and channel substrate
and create a damming affect in the channel. As a result a depositional wedge has formed upstream about 40 feet. This material is often removed during maintenance to restore
usefulness of the crossing. The ford causes frequent flooding downstream in the lower portion of the campground. Below the ford the channel experiences scour and deposition when
water and substrate overtop the ford.
4b. Have Corps permits or DWR certifications been obtained for this project (including all prior phases) in the past?*
r Yes G No F Unknown
4d. Attach an 8 1/2 X 11 excerpt from the most recent version of the USGS topographic map indicating the location of the project site. (for DWR)
4e. Attach an 8 1/2 X 11 excerpt from the most recent version of the published County NRCS Soil Survey map depicting the project site. (for DWR)

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:
4h. Explain the purpose of the proposed project:*
This project will restore stream connectivity to Thorps Creek and improve aquatic organism passage.
4i. Describe the overall project in detail, including indirect impacts and the type of equipment to be used:*
This proposal outlines plans to improve aquatic organism passage by removing the concrete vented ford on Thorps Creek and reconstructing appropmately 140 feet of disturbed
channel at the crossing to a natural bed and bank. Boulders and stream substrate would be used to create a riffle -pool stream bed sequence using reference reach parameters and
streambanks Will be constructed to reestablish reference channel dimensions. A medium sized trackhoe would be used in the construction of this project. All disturbed area shall be
seeded and mulched.
Upstream of the ford a bridge would be constructed to maintain vehicular access to the upper portion of the Mortimer Campground. At least one of the abutments and rip -rap on banks
under the bridge would impact the channel.
4j. Please upload project drawings for the proposed project.
2020_ThorpsCrk_AOP_ProjectDescription.pdf 3.2MB
5. Jurisdictional Determinations
5a. Have the wetlands or streams been delineated on the property or proposed impact areas?*
r Yes r No 6 Unknown
Comments:
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:
5d1. 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?
D. Proposed Impacts Inventory
1. Impacts Summary
1a. Where are the impacts associated with your project? (check all that apply):
r Wetlands W Streams -tributaries F Buffers
r— Open Waters r Pond Construction
3. Stream Impacts
F1
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
(?)
Jurisdiction*
length*
S1
Excavation of ford and Permanent
Excavation
Thorps Creek
P
Perennial
Both
20
140
aggraded substrate
Average (fee)
(lineafeet)
S2
Channel reconstruction Permanent
Stabilization
Thorps Creek
P
Perennial
Both
20
140
Average (feet)
(lir�rfeet)
S3
Bridge abutments
Permanent
Rip Rap Fill
Thorps Creek
Perennial
Both
20
80
Average (feet)
(lin�rfeet)
3i. Total jurisdictional ditch impact in square feet:
0

3i. Total permanent stream impacts:
360
3i. Total temporary stream impacts:
31. Total stream and ditch impacts:
360
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:
Construction would occur during lowflow periods and flowwould be diverted away from work to avoid elevated turbidity and sediment yield to Thorps
Creek. A temporary increase in turbidity and sediment deposition downstream of the site is likely during construction, but it will be minimized to keep
turbidity levels below the standard. Work is expected to be completed over a three week period, depending on weather.
1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques:
All hazardous materials will be stored outside of flood -prone areas and surrounded with sediment fence to reduce the risk of materials reaching the
stream.
Work activities would not be scheduled on rainy days.
Heavy Equipment Operation:
All equipment shall be cleaned before entering the project area and stream, so as to reduce the risk of fine grained sediment and oils and grease from
entering the stream. This would also reduce the risk of invasive weed spread onto the Forest.
Do not operate on wet soils when they are most susceptible to damage and erosion.
Operate heavy equipment on slopes less than 12 percent so as to reduce the risk of soil erosion. Avoid operating heavy equipment on over -hanging
stream banks.
Move large woody debris and boulders in a manner that minimizes disturbance of the forest floor, exposure of mineral soil, or degradation of stream
bank stability.
Install sediment fence or coir logs to trap potential sediment. Stabilize any disturbed area at the end of each workday.
Re -vegetate exposed soils as soon as possible to take advantage of the loose soil conditions for seeding.
Exposed soil will be covered with straw mulch or Coir erosion control matting at the end of the project. Matting will be secured in place With stakes and
live stakes where conditions allow.
Temporary seeding will occur on all bare soil within five days of ground -disturbing activities to provide long-term erosion control.
Stabilize channel banks With a temporary seed mix of wheat, millet, or similar annual grain as work is completed.
Do not move sediment trap devices until the vegetation in the disturbed areas has been established.
During on -going operations inspect the site frequently; inspect occasionally during inactive periods.
Check for potentially damaging or failing situations that may cause unacceptable water quality impacts.
Correct failing situations as soon as practical.
Conduct visual inspections of streamflowwhile the work is being conducted to maintain acceptable turbidity levels.
Use a skilled heavy equipment operator, trained in stream restoration and construction of in -stream structures. Instruct the operator to minimize
disturbance to the streambed.
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?
r Yes
r No
2b. If this project DOES NOT require Compensatory Mitigation, explain why:
This is a stream restoration project.
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
f• No
If no, explain why:
The project will not increase soil compaction or surface runoff, but reduce runoff from existing road into Thorps Creek.
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 15ANCAC 02H .1003(2)?
r Yes r No
Comments:
I will need some guidance here to be sure we are meeting Stormwater Requirements.
G. Supplementary Information
V
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
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
1c. If you answered "yes" to the above, has the document review been finalized bythe State Clearing House?*
r Yes r No
NEPAor SEPA Final Approval Letter
20100909ThorpsCreekDM.pdf
2. Violations (DWR Requirement)
83.97KB
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.
No cumulative effects are likely.
4. Sewage Disposal (DWR Requirement)
4a. Is sewage disposal required by DWR for this project?*
r Yes r Nor WA
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or habitat?*
r 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 r Unknown
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
Si. 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?
This information is published in the Federal Register for Designated Critical Habitat. We also received comment to project seeping from the USFWS
Asheville Field Office.
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?*
We used the following web site: http://ocean.floridamarine.org/efh_coral/ims/viewer.htm
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?*
USDA Forest Service, NFs in NC, Pisgah NF Archeologist completed a field assessment during the winter of 2016 and consulted with SHPO.
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:
The removal of the vented ford would reduce flooding.
8c. What source(s) did you use to make the floodplain determination?*
http://floodmaps.nc.gov/fmis/ & field determination
Miscellaneous
Comments
Miscellaneous attachments not previously requested.
Signature
*
W By checking the box and signing below, I certify that:
• 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:
Brady N. Dodd
Signature
Date
3/26/2020
U

Forest Service
File Code: 2500
Route To:
National Forests in North Carolina
Subject: Delegation of Authority
To: Brady Dodd
160A Zillicoa Street
Asheville, NC 28801
828-257-4200
FAX: [phone]
Date: March 17, 2016
You are hereby delegated the authority to act as my agent for all phases of the application
process for permits required by Section 404 of the Clean Water Act, for watershed restoration
and improvement projects such as aquatic habitat restoration and enhancement, habitat
restoration, channel stabilization, and channel relocation on the National Forests in North
Carolina. You are authorized to make formal application for all permits to the U.S. Anny Corp
of Engineers and the North Carolina Division of Water Quality, provide all necessary
information, and sign all correspondence.
Include this letter as part of all applications for Section 404 permits to the U.S. Army Corps of
Engineers and Section 401 Water Quality Certification to the North Carolina Division of Water
Quality.
HURSTON A. NICHOLAS
Forest Supervisor
USDA
AM
America's Working Forests —Caring Every ]day in Every Way Printed on Recycled Paper

DECISION MEMO
USDA FOREST SERVICE
PISGAH NATIONAL FOREST
GRANDFATHER RANGER DISTRICT
THORPS CREEK STABILIZATION
CALDWELL COUNTY, NORTH CAROLINA
DECISION
Description of Decision
I have decided to:
1) Lay back —700 feet of eroding stream bank to a 2:1 (rise:run) slope and replace the
footbridge following the completion of proposed stream work;
2) Remove three old fish structures;
3) Construct up to three log and boulder vanes and two constructed riffles. The instream
structure below the fish barrier would create a pool to improve passage of trout;
4) Implement erosion control measures, including native seed, straw mulch, coir matting on
stream banks, planting trees and shrubs, and installing split rail fence for long-term
stabilization. A medium sized trackhoe shall be used, along with a dump track -truck in
the construction of this project. All disturbed area will be seeded and mulched; and
5) At the existing Forest Service Road 116 crossing of Thorps Creek, remove the vented
ford crossing and install a crossing designed to pass fish.
This action is located near the Mortimer Recreation Area in Caldwell County, North Carolina and
is about 24 air miles northeast of the Grandfather Ranger Station in Nebo, North Carolina.
Purpose of Decision
The purpose of the action is to improve watershed conditions and species habitat by reducing the
chronic impacts from sedimentation to Thorps Creek. Currently the sedimentation and erosion is
impacting habitat, recreation opportunities, and public safety and is increasing maintenance costs
to roads and facilities.
Scopinq and Public Involvement
The proposal was listed in the July 2010 Schedule of Proposed Actions (SOPA) for the National
Forests in North Carolina. No comments were received.

Creek Streambank Stabilization
REASON FOR CATEGORICALLY EXCLUDING THE PROPOSED ACTION
Decisions may be categorically excluded from documentation in an environmental impact
statement or environmental assessment when they are within one of the categories identified in
Code of Federal Regulations (CFR) 220.6(d)(4): Repair and maintenance of roads, trails, and
landline boundaries (5): Repair and maintenance of recreation sites and facilities and
220.6(e)(6): Timber stand and/or wildlife habitat improvement activities that do not include the
use of herbicides or do not require more than I mile of low standard road construction. This
decision will improve habitat conditions and reduce potential for impacts to roads and the
Mortimer recreation area.
Categorical Exclusion & Extraordinary Circumstances
This category is appropriate in this situation because this is a low impact project that will not
have a significant effect on the environment. Also, there are no extraordinary circumstances or
conditions associated with the project. Extraordinary circumstances evaluated include:
a. Federally listed threatened or endangered species or designated critical habitat, species
proposed for Federal listing or proposed critical habitat, or Forest Service sensitive species.
A biologic evaluation was completed in September 2010, determining: This project will have
no negative effects on any species that are Federally listed or Forest sensitive. Consultation
with the U.S. Fish and Wildlife Service is not required.
b. Flood plains, wetlands, or municipal watersheds. No wetlands or municipal watershed are
present. The project area is within a narrow 100 year flood plain, but is designed to improve
watershed conditions long-term and reduce current impacts being caused to the watershed
and flood plain.
c. Congressionally designated areas, such as wilderness, wilderness study areas, or National
Recreation Areas. None are present.
d. Inventoried roadless areas. None are present.
e. Research Natural Areas. None are present.
f. American Indians and Alaska Native religious or cultural sites. An archaeological survey
was completed, determining the action was an exempt undertaking and not likely to impact
archaeological resources.
g. Archaeological sites, or historic properties or areas. An archaeological survey was
completed, determining the action was an exempt undertaking and not likely to impact
archaeological resources.
I have determined that the proposed action is consistent with the Land and Resource
Management Plan for the Nantahala and Pisgah National Forests (Forest Plan).
Administrative Review and Appeal
This decision is not subject to appeal pursuant to 36 CFR 215.12(e)(1).

Creek Streambank Stabilization
Implementation & Contact
The implementation of this project may begin following signature and continue until completed.
For additional information concerning this decision please contact Michael Hutchins Appalachian
Ranger District at 828-682-6146.
IS1906n V,, Crackeff
JOHN W. CROCKETT
District Ranger
Enclosure
Date

Thorps Creek Aquatic Organism Passage Improvements &
Road Crossing Replacement
@ Mortimer Recreation Area, Grandfather Ranger District
Project Description
Submitted by: Brady Dodd, NFsNC Forest Hydrologist, March 2020
PROJECT CURRENT CONDITION:
Thorps Creek is a tributary to Wilson Creek in the Catawba River Basin (Figure 1), and is
classified by the state as an Outstanding Resource Water. This reach of Thorps Creek, flowing
through the Mortimer Campground, has been a reach of concern due to erosion and the lack of
aquatic organism passage. The lower section of stream channel was rehabilitated in 2017 using
a natural stream design. In 2018 this watershed experienced a large storm which made several
adjustments to structures and bed elevations. As a result, the same reach is proposed for repair
of structures and restoration of habitat. This work is permitted by the 2016 USACE and NCDWR
(SAW-2016-00864) and planned for construction in 2020.
Upstream of the stream repair work the road accesses the upper portion of the campground,
crossing Thorps Creek with a concrete vented ford. The vented ford (Figure 2) is an impediment
to aquatic organism movement, as well as movement of channel substrate, woody debris and
streamflow. The culverts in the ford frequently plug with woody debris and channel substrate
and create a damming affect in the channel. As a result a depositional wedge has formed
upstream about 40 feet. This material is often removed during maintenance to restore
usefulness of the crossing. The ford causes frequent flooding downstream in the lower portion
of the campground. Below the ford the channel experiences scour and deposition when water
and substrate overtop the ford.
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 1

THORPS CREEK Aquatic Organism Passage
Improvements & Road { rossing '
Replacement Project @ MORTIMER
RECREATION AREA t:l
Grandfather Ranger district
SITE LOCATION & DRAINAGEAREA - °P � .�- , SITE LOCATIQN •.'
ilk, 3.
it1.
OrainaEe Area = 1.14 5q. miles
r
w
I r.r •
a �
�
Figure 1. Location of the Thorps Creek Aquatic Organism Passage Improvements & Road
Crossing Replacement Project.
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 2

t n ansr*cs
V
Thorps Creek Aquatic
Organism Passage
Improvements& Road
Crossing Replacement
Project - 2020
CURRENT CONDITION
Figure 2. Thorps Creek Aquatic Organism Passage Improvements & Road Crossing
Replacement Project, Current Condition sketch and photos of vented ford.
PROJECT PROPOSED ACTIOI
This proposal outlines plans to improve aquatic organism passage by removing the concrete
vented ford on Thorps Creek and reconstructing approximately 140 feet of disturbed channel at
the crossing to a natural bed and bank (Figure 3, 4, & Appendix A). Boulders and stream
substrate would be used to create a riffle -pool stream bed sequence using reference reach
parameters and streambanks will be constructed to reestablish reference channel dimensions
(Appendix A & B). A medium sized trackhoe would be used in the construction of this project.
All disturbed area shall be seeded and mulched. Construction specifications are presented in
Appendix C.
Upstream of the ford a bridge would be constructed to maintain vehicular access to the upper
portion of the Mortimer Campground (Figure 4). At least one of the abutments and rip -rap on
banks under the bridge would impact the channel.
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 3

Thorps Creek Aquatic Organism
Passage Improvements & Road
Crossing Replacement Project -
2020
PROPOSED ACTION
EDGEi�pT./r nW:
Approximate location of new bridge
crossing of Thorp& Creek. See Plan
View.
Vented ford crossing of Thorps Creek to be
removed and the remaining channel restored
to allow passaee of substrata, woody debris,
floodflow, and aquatic organisms.
�r
i
Figure 3. Thorps Creek Aquatic Organism Passage Improvements & Road Crossing
Replacement Project, Proposed Action sketch.
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 4

VENTED FORD CROSSING TO BE
REMOVED & CHANNEL RESTORED
AREAS OF STREAM IMPACT
y NEW BRIDGE
CROSSING
Thorps Creek Aquatic Organism Passage Improvements &
Road Crossing Replacement Project - 2020
PLAN VIEW
NFsNC Hydr^I9Ty- - Brady Dodd
Figure 4. Plan view of site with existing ford and new bridge location with area of proposed
stream impacts.
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 5

APPENDIX A - Reference Reach Data
Measured Cross Sections:
Riffle:
Feature
Value ft
mean BFd =
1.33
max BFd =
2
BFw=
24.3
inner berm=
4.5
Step -Pool:
Feature
Value ft
mean BFd =
1.87
max BFd =
3.50
BFw =
16.1
inner berm =
23-17=6
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 6

Cross Sections (Continued):
Pool:
Feature
ValueffJ
mean BFd=
1.34
max BFd =
2.28
BFw=
18.7
inner berm =
21-15=6
Design Features using Equations for the Regional Curve Relationships:
Bankfull Cross -Sectional Area vs. Drainage Area: y = 21.61xO68 = 23.62 ft2
Bankfull Discharge vs. Drainage Area: y = 100.64x071 = 111.18 cfs
Bankfull Width vs. Drainage Area: y = 19.05XC 37 = 20.00 ft
Bankfull Mean Depth vs. Drainage Area: y = 1.11XC 31 = 1.16 ft
* where x = drainage area of 1.14 square miles
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 7

Longitudinal Profile:
THORPS CREEK — LONGITUDINAL PROFILE @ FORD CROSSING W/ PROPOSED RIFFLE -POOL
PATTERN FROM {DEFERENCE REACH
vAw FORD
IXISTFNG-- -- — BOTTOM
2 w.. %o PROpp y�����
p 91.00
—
w �0 •A
1300 ItUO ISDU 1L.00 I]UU lSu�i� ]•V 1� ]WO R300
STATION IF BET)
NFsNC Hydrology -Brady Dodd
Design Valuesfrom surveyed Long -Pro
Channel
Length (feet)
Spacing (feet)
Slope (Channel bottom)
Feature
%of Total
Mean
Max
Min
Mean Max
Min
Mean
Max
Min
Riffle
56.0
19.0
44.2
2.2
34.07 63.1
11.1
0.0803
0.2636
0.0188
Run
12.1
4.1
10.5
0.8
-
-
-
0.1432
0.7375
0.0277
Pool
24.3
7.7
18.9
1.7
32.22 68.6
12.1
-0.0225
0.0172
-0.1278
Glide
7.6
2.8
4.5
1.0
1 -
-
I -
-0.1619
-0.0433
-0.3800
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 8

APPENDIX B - Structure Typicals
ROCKJ-HOOK VANE DETAIL
PLAN VIEW
1
/ SILL ROCK
MATERIAL U r
FROM POOL I
U SEDT0 Conrtra cted pool !
CONSTRLI CT
I NN ER BERM
C
O O s '... C
of O
ti
4
TOOTER ROCIL
4•
O
t6 C
1
HEADER ZQo
ROCK ahSlEr-
1/3 channel _ 1/B channel )(
6an001wldih Ban kUl width
C,
G PSININVERT
A TOP ROCK
ROCKJ-HOOK VANE DETAIL
CROSS SECTION
MATERIAL
FROM POOL
USED TO
CO NSTRII CT
I NN ER BERM
Beady Podd
I-IFI I. Hy di'o
AT OR BELOW
BANKFULL
ELEVATION
A . . . . . . .......... .......................... ....... A,
6ankfull ele vation
-- - z`%�SLORE GAPS PLl1GGED WITH COREL INl'ERT NEAR BED
- 9N VRNE ARM FROM ON SITE ELEVATION
R
HEADER
"'•'y„
\
ROCK
FOOTER
ROCK
.....................
.
.
CHANNEL BOTTOM
CLOSELY FITTED
BOl1LDER5 TO
PROFILE- THALW EG
MINIMIZE GAPS
k UL
k!F
POOL
Bead, [•odd
IiR I-: H,h )
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 9

/
CROSS VANE DETAIL
PLAN VIEW
/
/
/
t
/
c
/
FOOTER
A
/
ROCK
Constructed pool
HEADER
\
� ROCK
O \
/
O \
O
\
/
j
\
/
N
C
O
N
N
Y
�
NghFo
N
�
H�4•F\O•a
W
Y
MATERIAL
C
(p
FROM POOL
USED TO
CONSTRUCT
C Z�O. �ng�e
200 ah _
INNER BERM
MATERIAL
ie_. J
FROM POOL
USED TO
1/3channel
1/3 channel
CONSTRUCT
bankfull width
_
bankfull width a
INNER BERM
—dy Dodd
NFry rvydro
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 10

APPENDIX C - STREAM RESTORATION
SPECIFICATIONS
EQUIPMENT AND OPERATOR SPECIFICATIONS
A) Manner of Construction - Excavation will be done in a manner which will minimize
sedimentation in the stream channel. Silt fence will be installed downstream of the
construction area to reduce the risk of sediment entering the stream.
B) Equipment Operator Performance - Equipment operators shall be experienced and competent
in the use of the equipment to which they are assigned. They shall be expected to demonstrate
a level of proficiency with the equipment which enables them to be productive in all aspects of
stream restoration work. Equipment operators shall be experienced in the construction of
Rosgen designed structures; including the cross vane, J-hook vane, and Toe-wood/Sod mat.
C) Operators will be instructed by the construction inspector as to the desired result of
construction activities. Operators will be responsible for determining how best to use
equipment to achieve the desired results. Chain saw operators will be required to cut trees,
limbs and root masses as necessary to facilitate the removal and placement of debris in the
stream.
D) Environmental Considerations - Earth moving equipment will cross and operate in the stream
flow only when necessary and only when directed to do so by the construction inspector.
Equipment shall be new or of low hours and be maintained to prevent fuel, oil and lubricant
spills in the vicinity of the stream. Refueling, repairs and lubrication will be performed at a safe
distances from the stream and only at locations approved by the construction inspector where
water is controlled by runoff control measures.
E) Safety Considerations - At work sites, where equipment will be operated on Forest Roads,
flagman shall be stationed to warn oncoming traffic of congestion. Construction road signs shall
be in place and a means of removing sediment, mud or rocks from roadways shall be
established. The contractor will be responsible for the implementation of these measures.
F) Equipment Specifications
Hydraulic Excavator:
Track mounted, hydraulic powered.
Excavator:
o Min weight — 30,000 lbs
o Min. Reach — 22 feet
o Min Digging Depth — 20 feet
o Min Bucket size — 1.0 Cu Yd.
o Min 115 HP
o Equipped with hydraulic thumb, with experienced operator as described
above.
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 11

(More than 1 excavator may be required. Unit price bid should be for one excavator for one hour of
running time).
IN -STREAM STRUCTURES SPECIFICATIONS
Structure Stone
Description
The work covered by this section consists of furnishing, stockpiling, placing and maintaining approved
stone to be utilized to construct rock and log vanes, root wad structures, the step -pool structures,
stream crossings, sediment and erosion control measures for use in locations as directed by the
Designer. The quantity of stone may be increased, decreased, or eliminated entirely at the direction of
the Designer. Such variations in quantity will not be considered as alterations in the details of
construction or a change in the character of the work.
Materials
Stone for "Boulder" shall consist of blasted stone or other stone approved by the Designer. The stone
shall be sound, tough, dense, resistant to the action of air and water, and suitable in all other respects
for the purpose intended.
All stone shall meet the approval of the Designer. While no specific gradation is required, the various
sizes of the stone shall be equally distributed within the required size range. The size of an individual
stone particle will be determined by measuring its long dimension.
Acceptance Criteria for Stone
CLASS REQUIRED STONE SIZES (INCHES)
Minimum Average Maximum
Boulder 36 48 60
48" x 24" x 24"
No more than 5 percent of the material furnished can be less than the minimum size specified, more
than 10 percent of the material can exceed the maximum size specified. Boulders shall be relatively flat
on either side in the same dimension, preferably the long dimension.
Construction
The Contractor shall place stone, in locations shown on the construction plans to the thickness, widths,
and lengths as shown on the construction plans or directed by the Designer. All stone shall be placed
neatly and uniformly with an even surface to form an in -stream structure or a sediment and erosion
control device or in accordance with the construction plans and special provisions, and shall meet the
approval of the Designer.
Method of Measurement
The quantity of stone required to construct the structures or sediment and erosion control measures
detailed in these special provisions will be incidental to those bid items. However, field conditions may
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 12

warrant the need for additional stone greater than the quantity specified or detailed for each bid item.
The quantity of stone that has been incorporated into the project, as directed or approved by the
Designer, which exceeds 110% of the quantity required for each bid item will be measured by weight.
Measured by weight will require the quantity to be weighed in trucks on certified platform scales. Stone
that was previously stockpiled for other bid items will not be measured a second time for this provision.
Basis of Payment
When field conditions dictate the need for additional quantity greater than 10% of the bid item, the
quantity of stone measured as provided above, will be paid for at the contract unit price per ton for
"Boulder". Such price and payment will be full compensation for all work covered by this section,
including but not limited to furnishing, weighing, stockpiling, re -handling, placing, and maintaining the
stone and disposal of any materials not incorporated into the project if directed by the Designer.
Payment will be made under:
Boulder............................................................................................................................................TON
Rock] -hook & Cross Vane
Description
Rock J-hook and Cross Vanes are primarily used for grade control. These structures serve to maintain the
integrity of the upstream riffle while promoting scouring in the downstream pool. The design shape is
roughly that of the letter "J" or "U" with the apex located on the upstream side at the foot of the riffle.
Footer boulders are placed in the channel bottom for stability. Header boulders are then placed on top
of these footer boulders. Header boulders in the middle of the channel are at approximately the same
depth as the riffle. For the J-hook, on one side of the channel, wing boulders are placed at an angle to
the stream bank, gradually inclining in elevation until they are located near the bankfull surface directly
adjacent to the stream bank. On the other side, the structure turns downstream to create the hook of
the "J", matching the slope of the wing until it goes directly toward the bank as a sill. Water flowing
downstream is forced over these boulders towards the middle and opposite side of the channel,
effectively turning flow and scouring out a pool below. Boulders placed at the apex hold back streambed
material and prevent it from washing downstream.
The quantity of Rock J-hook Vanes may be increased, decreased, or eliminated entirely at the direction
of the Designer. Such variations in quantity will not be considered as alterations in the details of
construction or a change in the character of the work (See Rock J-hook Vane detail below).
Materials
All materials shall meet the requirements of boulder as outlined in Special Provision "Structure Stone".
Back fill material shall be obtained from the stream channel bed, likely from the constructed pool. Large
woody debris may be incorporated into the structure as directed by the Designer.
Installation
A trench shall be dug in such a manner that the footer boulders, the hook header boulders and at least
1/3 of the wing boulders are buried beneath the bed surface elevation. Refer to the construction plans
for exact installation guide and locations of vane to be installed. An excavator, with a bucket that
includes a hydraulic thumb, shall be used to place boulders under the supervision of Designer. Footer
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 13

boulders shall be placed first with header boulders placed on top prior to any back filling of the trench.
Boulders shall be selected and positioned such that they butt tightly together and there are multiple
contact points between all boulders (flat smooth surfaces that fit together). Gaps between boulders
shall be filled (chinked) with a combination of class A and No. 57 size stone found on site until plugged.
In the center portion of the channel (vane invert), the header boulder shall be placed with gaps between
the rock with the top of the header boulder at an elevation designated by the Designer. The header
boulders in the side, or wing, portion shall be placed in such a manner as they slope up from bed
elevation to bankfull or below at a 2 to 7 percent slope or as shown in detail. Header and footer
boulders at both banks shall be tied in securely to the bank in such a way that eliminates the possibility
of water diverting around them. A rock sill shall be utilized to further prevent water from cutting around
the structure. The area between the stream bank and vane on the upstream side of the structure will be
backfilled with stream bed material.
Structures shall be built to the approval of the Designer. The Designer may adjust the number and
placement of structures in the field.
Basis of Payment
Payment for installation of Rock J-hook Vane shall be as outlined. This payment shall be considered full
compensation for all labor, equipment, hauling, placing, handling, sorting, fitting, materials, and
incidentals necessary to construct the rock vane.
Payment will be made under:
Equipment& Labor.................................................................................................................................HOURS
Materials: Boulders......................................................................................................................................TON
ROCK J-HOOK
VANE DETAIL
A
PLAN
VIEW
.....
.......... _.......
9
(OPTIONAL]
R OOT LVAO
MATERIAL
' .
ENCORPORATED INTO
FROM POOL
!
VANE ARM BELOW LOW
115E D TO
C onst
ucted pod
F LOW E LE VATI ON
CON STRII CT
q
INNER BERM
0
0
m
7
'S
0
�
FOOTS R
ROCK
�
m
MATERIAL
hyh
FROM POOL
USEDTO
CON5TRl1 CT
C. ram:
INNER BERM
HEADER
RO CK
Va channel
Va channel
Is. l Jll v dth
6anldull width
G
LJ
A'
GAPS I N
INVERTTOP
5— -xc
ROCK
ti=ti� -?cra
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 14

AT OR BELOW
BANKFULL
E LE VATI O N
A
ba Nll devgion .......
GAPS PLUGGED WITH
---- FARM ROCK FROM ON SITE ; AT BED
- _ ELEVATION
- � fmr Decle
IOPTIONALj' CHANNEL BOTTOM
ROOTWAD PROFILE-T HALW EG
�RClff POOL
HEADER
ROCK
CLOSELY FITTED FOOTER
BO IILDERSTO ROCK
M IN IMIZE GAPS
GLIDE ; RIFFLE �
Bray Dodd
WKIC F�dm
CROSS VANE DETAIL
PLAN VIEW
7
' Constructed pool
Q \
O \ /
C
N
/
/
/
/
/
/
_a
1•FROM POOL
/•
MATERIAL
USED TO 1/3channel
CONSTRUCT bankfullwidth
INNER BERM
FOOTER
ROCK
HEADER
ROCK
MATERIAL
FROM POOL
USED TO
CONSTRUCT
INNER BERM
—
NFn H.a,.
EROSION CONTROL SPECIFICATIONS AND DETAILS
Seed and Mulch
Seed Planting Summary Table
Community Type: Riparian
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 15

Scientific Name
Common Name
Planting Density
Elymus virginicus
Virginia wild rye
22 Ibs/acre
Festuca rubra
Creeping red fescue
5 Ibs/acre
Dichanthelium clandestinum
Deertongue
5 Ibs/acre
Aster sagittifolius
Arrow Leaved Aster
2 Ibs/acre
Rudbeckia hirta
Black Eyed Susan
2 Ibs/acre
Eupatorium fistulosom
Joe Pye Weed
1 Ibs/acre
Eupatorium perfoliatum
Boneset
1 Ibs/acre
Vernonia gigantean
Giant Ironweed
1 Ibs/acre
Lodelia cardinalis
Cardinalflower
1 Ibs/acre
Asclepias syriaca
Common Milkweed
1 Ibs/acre
Materials
All materials shall meet the approval of the Designer. Seed material shall consist of species in the "Seed
Planting Summary Table" above.
Installation
Planting seed shall occur within 1 day of ground disturbing activities. The method of seeding may be
varied by the Contractor under his/her responsibility to provide a healthy, vigorous, weed free and
disease free uniform stand of grass. Seed shall be immediately covered with straw mulch in quantities
to cover at least 50 percent of the ground surface. On stream banks, Coir matting shall be placed to
hold seed and soil in place. Above are native grass species to be sown and their seeding density.
Maintenance shall begin immediately after seeding operations and continue until final acceptance.
Maintenance of seeded areas shall consist of watering, weed and pest control, erosion repair, reseeding
and incidental operations as necessary to establish a healthy, vigorous, weed free and disease free
uniform stand of grass. All areas that fail to show a uniform stand of grass for any reason shall be
treated repeatedly until a uniform stand of at least 90% coverage is attained with no bare area greater
than five square feet.
Basis of Payment
Payment for installation of seed and mulch will be paid for as outlined. This payment shall be considered
full compensation for all labor, equipment, furnishing materials, hauling, rehandling, sorting, materials,
and incidentals necessary to seed and mulch.
Payment will be made under:
Seedand Mulch........................................................................................................................................ACRE
Matting
Materials
All materials shall meet the approval of the Designer and include Coir fiber mat 700 (6-8 feet wide),
wooden stakes, and live stakes.
Installation
Coir fiber mat 700 shall be used on the lower stream bank up to the top of bank elevation. The matting
shall be fastened in place using wooden stakes. During the following plant dormant season, live stakes
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 16

shall be planted in the matting from water's edge to just above ban kfuII. A species list is in the Planting
Plan Summary Table in the "Plantings" section below.
Provide stakes made of hardwood with a hook to anchor matting. Stakes shall be installed to no less
than 1 foot deep for use on side slopes and no less than 3 feet for areas at the toe of the slope and along
the top edge of matting. Place the matting upon final grading, following seed and mulch application.
Provide a smooth soil surface free from stones, clods, or debris which will prevent the contact of the
matting with the soil. Unroll the matting starting at the bottom of the slope and apply without
stretching such that it will lie smoothly but loosely on the soil surface. Bury the top end of each piece of
matting in a narrow trench at least 6 in. (150 mm) deep and tamp firmly after staking with evenly spaced
stakes. Stake the matting according to the manufactures recommended pattern for specific product and
slope. Where one roll of matting ends and a second roll begins, install matting end -over -end with
approximately 6 inches of overlap. Stake through overlapped area using 5 stakes. Install stakes across
the matting at ends, junctions, and trenches approximately 1.3 feet apart. See the figure below for the
Erosion Control Matting Detail.
Basis of Payment
Payment for installation of matting will be paid for as outlined. This payment shall be considered full
compensation for all labor, equipment, furnishing materials, hauling, stockpiling, rehandling, sorting,
fitting, materials, and incidentals necessary to install matting.
Payment will be made under:
Matting......................................................................................................................................LINEAR FEET
EROSION CONTROL MATTING
DETAIL
TOP OF BrWK
EROSION CONTROL
BLANKETFROM BANKFQLL
TO V ABOVE TOP OF SANK,
COVERING SEED
TIN
1GD GrOkM COIRMATtKO
OAkWHuLL V LONQ
FROM TOE OF RANK TO
WOODEN
OANKFULLELEVATIOIJ,
14ALFN STA[J
COVEMNO SEED
TOP OF 3'
STAKES
TOE OF
$'LONG
ea'K.
WOODEN
STARE
THORPS CREEKAquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 17

Plantings
Description
Plantings shall be specified in each contract as to type e.g., container, bare root, and live staking.
Plantings from containers shall be from one gallon containers and can be planted throughout the year.
Live staking and bare root planting shall occur during plant dormancy. Bare root seedlings shall be 6 tc
12 inches tall. Below is a list of woody vegetation species to be planted on stream banks and
floodplains.
Planting Plan Summary Table
Scientific Name
Common Name
Percent of plantings
Spacing (feet)
Container & Bare Root Species:
Alnus serrulata
Tag Alder
10%
5
Clethra acuminate
Mountain sweet pepperbush
10%
5
Cal canthus floridus
Sweetshrub
10%
5
Clethra acuminate
Cinnamon Bark Clethra
10%
5
Hamamelis vir iniana
Witch Hazel
10%
5
Hypericum densiflorum
Bushy St. Johns
10%
5
Itea vir inica
15%
5
Xanthorhiza sim licissima
Yellowroot
10%
5
Betula lenta
Sweet birch
10%
10
Platanus occidentalis
Sycamore
5%
20
Live Stake Species:
Corpus ammonium
silky dogwood
15
3
Salix ni ra
black willow
20
3
Salix sericea
silky willow
20
3
Sambucus Canadensis
common elderberry
20
3
Salix humilis
prairie willow
10
3
Ph socar us o ulifolius
ninebark
15
3
Materials
All materials shall meet the approval of the Designer. Live staking plant material shall consist of species
shown in the Planting Plan Summary Table above.
All plant material shall be harvested locally (within the same physiographic ecoregion) or purchased
from a local nursery. All live stakes shall be dormant at time of acquisition and planting. Live stakes
shall be installed between November 15 and May 15. Live stakes shall be % - 1 % inch (12-38 mm) in
diameter and 2 to 4 feet (0.6-1.2 meters) in length.
During preparation, the basal ends of the live stakes shall be cleanly cut at an angle to facilitate easy
insertion into the soil, while the tops shall be cut square or blunt for tamping. All limbs shall be removed
from the sides of the live cutting prior to installation.
Installation
Cuttings for live stakes shall be harvested in a manner such that they are cut, immediately put into
water to be soaked for ten days, and then planted immediately after the ten days are completed.
Cuttings shall remain wet until they are planted. Outside storage locations should be continually shaded
and protected from wind and direct sunlight. Live stakes shall be tamped perpendicularly into the
finished bank slope with a dead blow hammer, with buds oriented in an upward direction. Stakes
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 18

should be tamped until approximately % of the stake length is within the ground. The area around each
live stake shall be compacted by foot after the live stake has been installed. One to two inches shall be
cut cleanly off of the top of each stake (with loppers) at an angle of approximately 15 degrees following
installation. Any stakes that are split or damaged during installation shall be removed and replaced.
Basis of Payment
Payment for installation of plantings will be paid for as outlined. This payment shall be considered full
compensation for all labor, equipment, furnishing materials, hauling, rehandling, sorting, materials, and
incidentals necessary to plant.
Payment will be made under:
Plantings......................................................................................................................................................... EACH
Temporary Silt Fence
Description
Furnish material, construct, maintain, and remove temporary silt fence in locations shown on the plans
or in locations that require surface drainage to be filtered.
Materials
Posts:
Provide steel posts meeting the following requirements:
• Minimum 5 feet (1.5 meters) long.
• Minimum 13/8 inches (34.9 mm) wide measured parallel to the fence.
• Minimum weight of 1.33 Ib/ft of length.
• Equipped with an anchor plate with minimum area of 14.0 square inches (9,032.1 square mm).
• Have a means of retaining wire and fabric in the desired position without displacement.
Woven Wire Fence:
Provide woven wire fence meeting the following requirements:
• Minimum 32 inches (812.8 mm) high.
• Minimum 5 horizontal wires.
• Vertical wires spaced 12 inches (304.8 mm) apart.
• Minimum 10 gage top and bottom wires
• Minimum 12 % gage all other wires.
Filtar Fahric
Provide Type 3 engineering fabric, Class A or B meeting the requirements of Section 1056 of the NCDOT
Specification book.
Attachment Device:
Provide an approved attachment device (e.g., plastic tie).
Installation
Install in locations as shown on the plans or as directed. Install wire and fabric as shown in the plans.
Class B synthetic filter fabric may be used without the woven wire fence backing, subject to the
following conditions: a maximum post spacing of 6 feet (1.8 m), fabric is approved by the Designer, and
post spacing is inclined toward the runoff source, at an angle of not more than 20 degrees from vertical.
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 19

Install posts at a 10 feet (3.0 m) maximum spacing with wire support, with not more than 4 feet (1.2 m)
of the post appearing above ground. Attach filter fabric to the wire fence on the upslope side of the
post with wire or other acceptable methods.
Overlap filter fabric a minimum of 18 inches (457.2 mm) at splice joints. Install fabric that is free of
defects, rips, holes, flaws, deterioration, or damage. See figure below for detail.
Basis of Payment
Payment for installation of silt fence will be paid for as outlined. This payment shall be considered full
compensation for all labor, equipment, furnishing materials, hauling, weighing, stockpiling, rehandling,
sorting, fitting, materials, and incidentals necessary to construct the silt fence.
Payment will be made under:
SiltFence.........................................................................................................................................LINEAR FEET
TEMPORARY EXTPR STR EMO EA FNff0L6
R_
WX6u7 wIRE1413em lA�X8u PPO RT
SEDIMENT/SILT FENCE
CONSTRUCTION DETAIL 1a1.11MIEM FOOT
STIEL P68B.11 L6 NO
MTN rROJECTFDHE
installation
Step 1:
Drive steel posts at least 12 in
into ground and excavate a 4in. x
Sin. trench uphill along the line of
posts.
Step 2:
Attach wire fence to posts and
extend the bottom of the fence
8in. into the excavated trench.
Step 3:
Attach the filter fabric to the Wire
fence and extend the bottom of
the fabric 8in. Into the trench.
Step 4:
Backfill the trench and compact
the soil firmly to anchor the
bottom of the silt fence so that
runoff is forced to go through the
fence and cannot go around it.
■
SCLux.T WFCX WIRE
lemOO
e Lux. aPAc iAa wrrxo ur
I?Uk%R7 CING
HPIAE SW"0 RT Fe*Qe
131L1l IUM FOOT
F ILT EA FA L P.0 ATTIC X ED
STIEL POSB.!IA NO
' Erc aRELYT HPWR9VA
Wrm PHOJECTVAS
SIVEOF POST
I
RUNG
--
9* Y+VL
—OFF
cRF���LRX
_
srORR� of
1r
IXN
�
Sp`
MX
f
f + IP1FiA CGFJRACTEO
N 011PAO
Va
a,uciaxl
ATIIY oa RD DETAL L
THE NCH WTH NAIVE KACL R FF
AI TERMATE DETAIL
TReNCX [MTN ORAVEI
HDTES:
7, INSPECT AND REPAIR FENCE AFTER EACH STORM EVENT &REMOVE SEDIMENT WHEN NECESSARY.
2, REMOVED SEDIMENT SHALL BE DEPOSITED TO AN AREA THAT WILL NOT CONTRIBUTE SEDIMENT OFF -SITE
& CAN BE PERMANENTLY STABILIZED.
3. SILT FENCE SHALL BE PLACED ON SLOPE CONTOURSTO MAXIMIZE PONOING EFFICIENCY.
THORPS CREEKAquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 20

APPENDIX D - Additional Information
Flood Maps:
-- LN
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y Vn•+,h7'O ,,� uZONEX s - ZONE AE
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GRID NORTH
MAP SCALE 1" = 1000' (9 12.000]
loco 000
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--
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PANEL1882K
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FIRM
\'•., 7514 .----ZONEX �/` --V„1
m
FLOOD INSURANCE RATE MAP
YYY ii ti V4✓ - /
i47 t �-°. e-7548
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f —���� 1P��
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ZONE X r5o, - ?7i( K 28 750,8(
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THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 21

Soils Map:
3
431L%
d 59'IWN
— 5T.T N
Soil Map —Caldwell County, North Carolina
(Thorps Creek Stream Enhancement Projec# Area)
4312317 4313I0 431390 431470 431550
43L150 431230 431310 4313M 431470
3
Map Sale: 1:3.210 f ported on A porhad (SS' x 11) 4,..t
pirt—
N
0 45 90 180 270
AFeet
0 150 300 eao Sao
Map projection: Web Merramr Comervaadr0a: WG584 Edge tie: UIM Zone 17N WG584
usuA Natural Resources Web Sail Survey
Conservation Service National Cooperative Soil Survey
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
�i
�.j 3�9i 2i'N
431550 43163D
3
4/4/2016
Page 1 of 3
Page 22

Sad lddp—Cakwad CourAV NOM cu0►n
Map Unit Legend
Thorp& Crddk Swwn f ntwe . .
PROpcl : .
c sewed come %am emus d "Mn
No half f w W ow umumm Av In AM ftmem of AM
ACE A *.Crwsbvm c[np"a, 3010 U 3%
50 P—w **ft. wy -EkY
Acr Ash*-Owsba cavw. 5o 10 21 3%
96 Prcw 00M, very raft
e0A
8drHrr SSN* . .0163
—Predominant
17 0%
Project Soil
C'hl1
Chdunul f3ulednen <orrip"d_
90%
1510 3o pH[wq sbpe5_ fbM
Cho w asum"M c a.
ChE
14 4 3%
3010 50 parmd Sk"n- V-w
ChosmwE&NIoft cow4" .
ME
1 t 34%
301o50Parcm abpw.swM
02 ON
EWD
Ewd Como vw%ftz,
*SCwPndnl 1510 30 parerd
A*-. 0NVf
49 14 7%
QrE
Ot"Mis4.Tw oxdoWsr 30 to
50 Pucont slop+a. dxrdnrMi
saw
GC
GrwdWT4w nw* 110odnb
1 1
32%
C+san. *WON* hooded
coop"«. 110 15 PE NM
sews. dAdwrrM err t
SIB
SY wbdm.2to9paraNM
02
00%
310M. rarely 200dnd
TO
Tab 60 swi&F ban. 2la !
WWI S""
09
2 0%
Td0
Taw ew sarwr seem. 810 30
40
119%
paftwlsep►s
TOD
Tme Grerme cuep"x 15la
E
I'll
4 f%
30 PMON 7a00d'i, MV raorrf
TWO W AM of ldW.M
712
140^
THORPS CREEK Aquatic Organism Passage Improvements & Road Crossing Replacement Project
Page 23