20120982 Ver 1_401 Application_20171217

4700 Fails of the Neuse Road, Suite 300
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Raleigh, NC 27609 (�
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December 20, 2017S
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US Army Corps of Engineers
Wilmington District, Regulatory
69 Darlington Avenue
Wilmington NC 28403-1343 P All,
Attn: Mr. Mickey Sugg, Project Manager
Subject: Town Creek Headwaters Mitigation Bank, Brunswick County, NC
Dear Mickey:
On behalf of our client, Resource Management Service, LLC (RMS), we would like to submit application for
Nationwide Permit #27 approval under the Clean Water Act to allow RMS to move forward with
construction of Phase I of the Town Creek Headwaters Mitigation Bank in Brunswick County, NC. By copy
of this letter and its attachments, we are also requesting review for 401 Water Quality Certification through
the NC Division of Water Resources.
The attached application and construction drawings have been prepared in keeping with methodology
outlined in our approved Mitigation Plan, with slight variation as outlined in our November 21, 2017 letter to
you (i.e. strategic placement of ditch plugs versus complete ditch fill due to limitations of available on-site
material). It would be our intent to provide notification to your office as to the start date for construction as
well as the date of completion.
We welcome your review and comment of this application package. Please feel free to call me to discuss as
necessary.
Sincerely,
pDomey
CHOL
cc: Dr Craig Hedman, FRS
Mr. Tony Doster, RMS
Karen Higgins, 401 Program, NC Division of Water Quality, NCDWR (with attachments)
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A. Applicant Information
1. Processing
Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.4 January 2009
Pre -Construction Notification (PCN) Form
1 a. Type(s) of approval sought from the Corps: 1 ❑X Section 404 Permit ❑ Section 10 Permit
1 b. Specify Nationwide Permit (NWP) number: 27 or General Permit (GP) number:
1c. Has the NWP or GP number been verified by the Corps? ❑X Yes ❑ No
1d. Type(s) of approval sought from the DWQ (check all that apply).-
0
pply):❑X 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express ❑ Riparian Buffer Authorization
1 e.
Is this notification solely for the record
becausewritten approval is not required?
For the record only for DWQ
401 Certification:
❑ Yes ❑X No
For the record only for Corps Permit.-
ermit:because
❑ Yes ❑X No
1f.
Is payment into a mitigation bank or in -lieu fee program proposed for
mitigation of impacts? If so, attach the acceptance letter from mitigation bank
or in -lieu fee program.
❑ Yes
❑X No
1g.
Is the project located in any of NC's twenty coastal counties. If yes, answer 1h
below.
Yes
❑ No
1 h.
Is the project located within a NC DCM Area of Environmental Concern (AEC)? j
❑ Yes
X❑ No
2.
Project Information
3h.
Email address:
2a.
Name of project:
Town Creek Headwaters Mitigation Bank
2b.
County:
Brunswick
2c.
Nearest municipality / town:
Supply
2d.
Subdivision name:
n/a
2e.
NCDOT only, T.I.P. or state project no. -
o:3.
3.
Owner Information
3a. Name(s) on Recorded Deed: Springwood Timberlands, LLC c/o Resource Management Service
3b. Deed Book and Page No. Brunswick County Deed Book: 3546, Page, 827, Parcel ID 0640000604
3c.
Responsible Party (for LLC if
Springwood Timberlands, LLC
N
applicable):
i�r
3d.
Street address:
31 Inverness Parkway
3e.
City, state, zip:
Birmingham, AL 35242
3f.
Telephone no.:
800-995-9516 (local number 910-444-2944)
3g.
Fax no.:
205-991-2807
3h.
Email address:
[e-mail]
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Page 1 of 10
PCN Form — Version 1.4 January 2009

4. Applicant Information (if different from owner)
4a. Applicant is:
❑ Agent ❑X Other, specify: Local Contact: NC RMS Manager
4b. Name:
Tony Doster
4c. Business name
(if applicable):
Resource Management Service, LLC
4d. Street address:
2704-C Exchange Drive
4e. City, state, zip:
Wilmington, NC 28405
4f. Telephone no.:
910-444-2944
4h. Email address:
[e-mail]
5. AgentlConsultant Information (if applicable)
5a. Name:
John Dorney
5b. Business name
(if applicable):
Moffatt & Nichol
5c. Street address:
4700 Falls of Neuse, Suite 300
5d. City, state, zip:
Raleigh, NC 27609
5e. Telephone no.:
919-7814626
5f. Fax no.:
5g. Email address:
[e-mail]
Page 2 of 10

B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID):
0640000604; Brunswick County
1 b. Site coordinates (in decimal degrees):
I Latitude: 34.1443 Longitude: 78.2357
1 c. Property size: 643 acres
2. Surface Waters
2a. Name of nearest body of water to proposed project: Tompkin Branch, Lewis Swamp (tribs of Town Creek)
Water ua i y asst ica ion of—nearest of—nearestreceiving water:
2c. River basin: Cape Fear (mostly), small portion of the Waccamaw
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
Site has been an area of intensive silviculture for several decades. Characterized by series of interior and perimeter ditches with dirt roads parallel to
the ditches. Vegetation is mainly pine plantation of various ages or cleared pine plantation. This permit request is for Phase t (643 acres). Permitting
and implementation of Phase II (375 acres) and Phase III (831 acres) will be done separately at a later date.
3b. List the total estimated acreage of all existing wetlands on the property: 0.267
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: 0
3d. Explain the purpose of the proposed project:
To restore wetland hydrology and allow for development of a functioning wetland ecosystem as part of approved plan for a wetland mitigation bank.
Activities will follow the Mitigation Plan which has been incorporated into Mitigation Banking Instrument approved by the Interagency Review Team.
3e. Describe the overall project in detail, including the type of equipment to be used:
Ditches will be plugged or filled as described in the Mitigation Plan using a variety of construction equipment (backhoes, bulldozers, and dump trucks)
as deemed necessary to complete the work.
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (includingall prior phases)in the past?
❑X Yes ❑ No ❑ Unknown
Comments:
4b. If the Corps made the jurisdictional determination, what type
of determination was made?
Preliminary ❑ Final
4c. If yes, who delineated the jurisdictional areas?
Name (if known):
Agency/Consultant Company: Atkins
Other: January 2014
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
n/a
5. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
❑ Yes ❑X No ❑ Unknown
5b. If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a. Is this a phased project?
❑X Yes ❑ No
6b. If yes, explain.
Phase I of the mitigation bank is included in this application. Approval for Phases II and III will be sought at a later date if these Phases are determined
to be viable.
Page 3 of 10
PCN Form — Version 1.4 January 2009

C. Proposed Impacts Inventory
I. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
❑ Wetlands ❑ Streams — tributaries ❑ Buffers ❑X Open Waters ❑ Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on the site, then complete this question for each wetland area impacted.
2a.
Wetland impact
number
Permanent (P) or
Temporary
2b.
Type of impact
2c.
Type of wetland
2d.
Forested
2e.
Type of jurisdiction
Corps (404,10) or
DWQ (401, other)
2f.
Area of
impact
(acres)
W1 -
Choose one
Choose one
Yes/No
-
W2 -
Choose one
Choose one
Yes/No
-
W3 -
Choose one
Choose one
Yes/No
-
W4 -
Choose one
Choose one
Yes/No
-
W5 -
Choose one
Choose one
Yes/No
-
W6 -
Choose one
Choose one
Yes/No
-
2g.Total Wetland Impacts
a
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a.
Stream impact
number
Permanent (P) or
Temporary (T)
3b.
Type of impact
Choose one
3c.
Stream name
3d.
Perennial (PER) or
intermittent (INT)?
3e.
Type of
jurisdiction
3f.
Average
stream
width
(feet)
3g.
Impact
length
(linear
feet)
31 -
-
S2 -
Choose one
-
S3 -
Choose one
-
S4 -
Choose one
-
-
S5 -
Choose one
-
S6 -
Choose one
-
3h. Total stream and tributary impacts
o
3i. Comments:
Page 4 of 10
PCN Form —Version 1.4 January 2009

4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries, sounds, the Atlantic Ocean, or any other open water of
the U.S. then individually list all open water impacts below.
4a.
Open water
impact number
Permanent (P) or
Temporary
4b. 4c. 4d.
Name of waterbody
(if applicable) Type of impact Waterbody
type
4e.
Area of impact (acres)
01 P
Unnamed tributaries to Town Creek Fill Other
0.26
-
02
ehoose one
03 -
Choose one Choose
04
Choose one Choose
4f. Total open water impacts
0.26
4g. Comments:
5. Pond or Lake Construction
If pond or lake construction proposed, the complete the chart below.
5a.
Pond ID number
5b.
Proposed use or
purpose of pond
5c.
Wetland Impacts (acres)
5d.
Stream Impacts (feet)
5e.
Upland
(acres)
Flooded
Filled
Excavated
Flooded
Filled
Excavated
P1
Choose one
P2
Choose one
5f. Total:
5g. Comments:
5h. Is a dam high hazard permit required?
❑ Yes ❑ No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer, then complete the chart below. If yes, then individually list all buffer impacts
below. If any impacts require mitigation, then you MUST fill out Section D of this form.
6a. Project is in which protected basin?
❑ Neuse ❑ Tar -Pamlico ❑ Catawba ❑ Randleman ❑ Other:
6b.
Buffer Impact
number -
Permanent (P) or
Temporary
6c.
Reason for impact
6d.
Stream name
6e.
Buffer
mitigation
required?
6f.
Zone 1
impact
(square
feet)
6g.
Zone 2
impact
(square
feet
B1 -
Yes/No
B2 -
Yes/No
B3 -
Yes/No
B4
Yes/No
B5
Yes/No
B6 -
Yes/No
6h. Total Buffer Impacts:
0
0
6i. Comments:
Page 5of10

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
A total of approximately 73,295 feet (6.36 acres) of ditches are present on the property. However, fill activities have been strategically focused to
specific locations on the property, thereby eliminating the need for wholesale site disturbance. Hydrologic modeling was employed to ensure that
plugs and fill will not be subject to scour and erosion. Remnant ditch features will remain as open water to provide habitat diversity in the landscape.
Site sensitivity was considered during design with a focus to integrate this site into the Green Swamp ecosystem.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
Construction of ditch plugs will be limited to the disturbance footprint of the plugs. Access to the specific plug sites will follow currently cleared
pathways whenever feasible. Sediment and erosion control measures will be implemented. Because work will be contained within the interior of this
former pocosin system, no discharges from the site are anticipated since flow pathways (ditches) are being removed or modified.
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?
❑ YesX❑ No
2b. If yes, mitigation is required by (check all that apply):
❑ DWQ ❑ Corps
2c. 4feyes, which len option used fGr this
project?
❑ Mitigation bank
_ _ _- _e _- e - p _ _-
❑ Payment to in-li. ie- program
u ci n uucc i �c�N.n owic rvuuyauv
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank:
3b. Credits Purchased (attach receipt and letter)
Type: Choose one
Type: Choose one
Type: Choose one
Quantity:
Quantity:
Quantity:
3c. Comments:
4. Complete if Making a Payment to In -lieu Fee Program
4a. Approval letter from in -lieu fee program is attached.
❑ Yes
4b. Stream mitigation requested:
linear feet
4c. If using stream mitigation, stream temperature:
Choose one
4d. Buffer mitigation requested (DWQ only):
square feet
4e. Riparian wetland mitigation requested:
acres
4f. Non -riparian wetland mitigation requested:
acres
4g. Coastal (tidal) wetland mitigation requested:
acres
4h. Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
Page 6 of 10
PCN Form — Version 1.4 January 2009

6. Buffer Mitigation (State Regulated Riparian Buffer Rules) -required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires
buffer mitigation?
Yes ❑ No
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
6c.
6d.6e.
Zone
- -Reasoner impact
of"i�afimpact
(square feet)
_
u-101-Ttiplier -equire�c
mitigation
(square feet)
Zone 1
3 (2 for Catawba)
Zone 2
1.5
6f. Total buffer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund).
6h. Comments:
Page 7 of 10

E.
Stormwater Management and Diffuse Flow Plan (required by DWQ)
1.
Diffuse Flow Plan
1a.
Does the project include or is it adjacent to protected riparian buffers identified
❑ Yes ❑X No
within one of the NC Riparian Buffer Protection Rules?
1 b.
If yes, then is a diffuse flow plan included? If no, explain why.
❑ Yes ❑ No
2.
Stormwater Management Plan
2a.
What is the overall percent imperviousness of this project?
0
2b.
Does this project require a Stormwater Management Plan?
❑ Yes © No
2c.
If this project DOES NOT require a Stormwater Management Plan, explain why:
This project will not add any impervious surface to the local watershed and in fact, will remove existing impervious surface in the form of local roads.
After the project is completed, there will be less runoff from the site since ditches will be filled or plugged. NC DEQ has been contacted and a
stormwater exemption is proposed.
2d.
If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan:
2e.
Who will be responsible for the review of the Stormwater Manaaement Plan?
3.
Certified Local Government Stormwater Review
3a.
In which local overnment's jurisdiction is thisproject?
❑ Phase II
3b.
Which of the following locally -implemented stormwater management programs
❑ NSW
❑ USMP
apply (check all that apply):
❑ Water Supply Watershed
❑ Other:
3c.
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑X No
attached.
4. DWQ Stormwater Program Review
❑Coastal counties
❑HQW
4a.
Which of the following state -implemented stormwater management programs applyHSession
ORW
(check all that apply):
Law 2006-246
❑Other:
4b.
Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑X No
attached?
5. DWQ 401 Unit Stormwater Review
5a.
Does the Stormwater Management Plan meet the appropriate requirements?
❑ Yes ❑ No
5b.
Have all of the 401 Unit submittal requirements been met?
❑ Yes ❑ No
Page 8 of 10
PCN Form — Version 1.4 January 2009

F.
Supplementary Information
1.
Environmental Documentation (DWQ Requirement)
1 a.
Does the project involve an expenditure of public (federal/state/local) funds or the
❑ Yes ❑X No
use of public (federal/state) land?
1 b.
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
El Yes ❑ No
�_
_
1 c.
If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
❑ Yes ❑ No
letter.)
Comments:
2.
Violations (DWQ Requirement)
2a.
Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards,
❑ Yes ❑X No
or Riparian Buffer Rules (15A NCAC 2B .0200)?
2b.
Is this an after -the -fact permit application?
❑ Yes ❑X No
2c.
If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3.
Cumulative Impacts (DWQ Requirement)
3a.
Will this project (based on past and reasonably anticipated future impacts) result in
El Yes ❑X No
additional development, which could impact nearby downstream water quality?
3b.
If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
4.
Sewage Disposal (DWQ Requirement)
4a.
Clearly detail the ultimate treatment methods and disposition (non -discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
There will be no wastewater generated by the project.
Page 9 of 10
PCN Form — Version 1.4 January 2009

5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or
❑Yes ❑X No
habitat?
5b. Have you checked with the USFWS concerning Endangered Species Act
Yes ❑ No
impacts?
5c. If yes, indicate the USFWS Field Office you have contacted.
Raleigh-
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
US Fish and Wildlife Service website and subsequent site visits by trained field biologists.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat?
❑ Yes ❑X No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
National Marine Fisheries Service website and subsequent site visits by trained field biologists.
7. Historic or Prehistoric Cultural Resources JCorRequirement
7a. Will this oroiect occur in or near an area that the state. federal or tribal
governments have designated as having historic or cultural preservation
❑ Yes ❑X No
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
State Historic Preservation Office website
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA-designated 100-year floodplain?
❑ Yes ® No
8b. If yes, explain how project meets FEMA requirements:
8c. What source(s) did you use to make the floodplain determination?
Stale of NC, Flood Risk Information System website
'
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Applicant/Agent's Printed Name
Date
Applica Agent's Signat re
nt's signature is valid only if an a thorization
letter from the app licant is ro ded.
Page 10 of 10

fj
0 5001,000 2,000 3,000
Feet
Wetlands Jurisdictional Determination Map - Phases I and 11 Town Creek
HeadAnters MkWdon Bar*
North Carolina

0
41�
Phase I
e
I:e
INC Green Swamp Preserve
19
Phase 3
Phase 2
411
,Ialm

Agent Authorization Form
Property Legal Description
Brunswick County, NC Deed Book: 3546 Page: 827 Parcel ID: 0640000604
Springwood Timberlands, LLC
c/o Resource Management Service
32 Inverness Parkway
Birmingham, AL 35242
The undersigned, registered property owners of the above named property, do hereby authorize John
Dorney of Moffatt and Nichol to act on our behalf and take all actions necessary for the processing,
issuance, and acceptance of this permit or certification and any and all standard and special conditions
attached.
Address Communications to.
Tony Doster
Manager, NC Region
Resource Management Service, LLC
2704-C Exchange Drive
Wilmington, NC 28405
920-444-2944
tdosteriE resourcemgt.com
I hereby certify the above information submitted in this application is true and accurate to best of my
knowledge. 9
Date: _ / / / ��-

Agent Authorization Form
Property Legal Description
Brunswick County, NC Deed Book: 3546 Page: 827 Parcel ID: 0640000604
Owner:
Springwood Timberiands, LLC
c/o Resource Management Service
31 Inverness Parkway
Birmingham, AL 35242
The undersigned, registered property owners of the above named property, do hereby authorize Jerry
McCrain of Moffatt and Nichol to act on our behalf and take all actions necessary for the processing,
issuance, and acceptance of this permit or certification and any and all standard and special conditions
attached.
Address Communications to:
Tony Doster
Manager, NC Region
Resource Management Service, LLC
2704-C Exchange Drive
Wilmington, NC 28405
910-444-2944
tdoster(Dresourcemat.com
I hereby certify the above information submitted in this application is true and accurate to best of my

TOWN CREEK HEADWATERS MITIGATION BANK
PHASE 1 CONSTRUCTION
P%..MS
Resource Management Service, LLC
BRUNSWICK COUNTY, NORTH CAROLINA
VICINITY MAP
NTS
ummm
G-001
ORAvnNC SCALES SHOMN BASFD CN 2P'cH" ORAMNC
INDEX OF DRAWINGS
SHEET NUMBER
TITLE
G-001
TITLE SHEET
G-002
GENERAL NOTES
EC -100
LIMITS OF DISTURBANCE
C-101
CIVIL PLAN
C-501
CIVIL DETAILS
VICINITY MAP
NTS
ummm
G-001
ORAvnNC SCALES SHOMN BASFD CN 2P'cH" ORAMNC
9'
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GREEN SWAMP PRESERVE
VICINITY MAP
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G-001
ORAvnNC SCALES SHOMN BASFD CN 2P'cH" ORAMNC

2
GENERAL NOTES:
1. NOTES BELOW ARE NOT INTENDED TO REPLACE SPECIFICATIONS.
Ir�HrHrH.Hau[
2. ALL FEDERAL. STATE, AND LCCAL SAFETY REGULATIONS ARE TO BE STFICTLY
FOLLOWED. METHODS OF CONSTRUCTION AND ERECTION OF STRUCTURAL
MATERIAL 15 THE CONTRACTORS RESPONSIBILITY.
D 3. THE CONTRACTOR SHALL ABIDE BY ALL APPUCABLE FEDERAL. STATE, AND LOCAL
ENVIRONMENTAL PROTECTION STANDARDS, PERMITS, LAWS, AND REGULATIONS.
D
j
4. EXISTING CONSTRUCTION INCLUDING UTILITIES, DRAINAGE, AND OTHER
MISCELLANEOJS WORK WHICH 15 TO REMAIN. SHALL REMAIN UNDISTURBED AND BE
PROTECTED.
5. THE CONTRACTOR SHALL COCRDINATE ALL WORK WITH THE OWNER WITH RETARDS
TO ACCESS T7 THE PROJECT SITE. THIS INCLUDES ADDITIONAL CLEARING OF
AREAS NOT SHOWN ON PLANS.
6. THE CONTRACTOR SHALL BE RESPONSIBLE FOR CLEANUP OF ANY MATERIALS
DEPOSITED OUTSIDE THE WORK AREA.
AREAS DISTURBED SHALL BE REPAIRED TO THEIR ORIGINAL CCNDITION BY THE
CONTRACTOR
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PHASE t
TION AREA
DIFGH I
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LOC
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DITCH PLUG DETAILS SEE
NOT TO 5-11
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-
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EXISTING DITCH
PROPOSED CITCH PLUG
V 8
Y:
DITCH PLUG LOCATION TABLE
DITCH
PLUG LOCATION TA LE
o
POINT Ne NORTHING FASTING
POINT No
NORTHING
'EASTII.G
NOTES.
^
N
OP7 141516.57 2223187.65
DPI3
144472.59
2230973.12
1. DITCH LOCATIONS AND PROPOSED PLUG LOCATIONS ARE
APPROXIMATE.
O 1
DP2 141918.10 2223493.66
DP14
142958.58
223117&63
E
DP3 142077.60 2223960.10
DP15
141391.79
223139.59
w
DP4 142489.39 2225169.41
DP16
143426.30
203293=.38
DPS 143045.78 2223710.34
DP17
145492.23
22 3400=.82
OP6 141223.49 2223911 74
DP18
144302.89
3}563.12
Am
DP7 141235.11 2224418.57
DP19
144338.45
223384=.75
DP8 141253.81 2225253.92 DP20 144370.25 223410:.73
DP9 141291.30 2226690.45
DP21
143618.13
DP10 143346.]7 222]726.85
DP22
143751.48
3234165.11=uv'3{tss��
_
A DP11 142397.88 2228092.01
DP23
143100.60
223358=.40
OP12 141335.44 2223674.09
DP24
191466.15
22}q}7..}0
os
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Referent
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MAIM- SCAUES SNOYM BASER OB 22' W OAAW
C-101
6

4
EXISTING■,.1
,ur1S
36' CNP
8'
---------
WRAP JOINT WITH
8_ OZ NONWOVEN
FABRIC TO PREVENT
��
NON-SHRINK GROUT
-- ---
SOIL INTRUSION
--- —
--------------------
ral
— _
- I I
I
I NOTE:
1
-----------I
I TRASH RACK
---------
l-----------
J
I
NOT SHOWN
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I
I FOR CLARITY
EXC9VAI,FM1J�MINERAL-$2l-✓ /
I
I
N
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I
a o
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I
x
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C %A1 DITCH PLUG DETAIL: PLAN VIEW
i
I
cc z N
a
csDl scALE. i/6'- V-01
<
p = p Z
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wap
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cc
o
RISER DETAIL
PLAN VIEW
3 =
cem A
O a
1-
R
1.5 BELOW LOW
ELEVATION ON
PROVIDE TRASH RACK NTH
3 TO B INCH OPENINGS AND
ANCHOR TO RISER FOR
F _
R j[
B
OLD MODES
ISLAND ROAD
SIMPLE REMOVAL
y
( Y
B u a �
I ___
-
y\ EXCAVATE TO MINERAL SOIL
N-ml
I I
O
II
EXCAVATE TO MINERAL
I�
AND SIDES WITH 'I II I'.
SOIL AND PROVIDE /57
X94
B-OZ NONWOVEN I I
STONE BASE, 6' MIN
ISg d
GEOTEXTILE I I.
p9:
TTI
- - - I
E-
/—A2'\ DITCH PLUG DETAIL: SECTION VIEW
t
y v4
AM
P LC CON 7R TON NO c
A CONSTRUCT ONE PLUG AT A TME. OR ONE PLUG PER CREW AT A TIME, AND STABILIZE EACH BEFORE MOVING TO THE NEXT LOCATION. DEWATER AN APPROPRIATE LENGTH OF
DITCH TO CONSTRUCT THE PLUG. REMOVE ORGANIC MATERIAL FROM THE DITCH SIDES AND
NOTE. CONTRACTOR WILL NEED MI MEASURE PIPE
ELEVATIONS TO DETERMINE HEIGHT OF S
VERT AND ROAD
UCTURE.
G"F4
A
BOTTOM AT THE LOCATION WHERE THE PLUG HILL BE INSTALLED. DIG A BORROW PIT
ADJACENT TO THE DITCH FOR COLLECTING MINERAL SOIL TO USE IN THE PERMANENT PLUG CONSTRUCTION. APPLY THE MINERAL SOIL TO THE PLUG LOCATION AND COMPACT IN 6
INCH LIFTS. COMPACT USING A VIBRATORY PLATE COMPACTOR, OR SIMILAR. IF THE MATERIAL IS FOUND TO HAVE A HIGH CLAY CONTENT, USE A SHEEPSFOOT COMPACTOR, OR
RISER DETAIL: SECTIONVIEW
A
SIMILAR EQUIPMENT. APPLY SIX INCHES OF TOPSOIL AND LIGHTLY MANUALLY COMPACT THE SOIL. A WETLAND SEED MIXTURE SHALL BE APPLIED ON THE TOPS OF THE DITCH
PLUGS AND DOWN 3 FEET IN ELEVATION ALONG THE PLUG SIDE SLOPES TO ESTABUSH VEGETATIVE COVER. SEED IS NOT REQUIRED AT LOWER ELEVATIONS THAN THE TOP
6501 SCALE. 3/A' _ V-D'i„`•,�t+
"w
•
3 FEET
OF EACH PLUG BECAUSE THOSE AREAS WILL BE SUBMERGED IN DEEPER WATER. THE MIX SHALL MEET THE SPECIFICATION OF ERNST SEEDS' NC COASTAL PLAIN FACW MIX' AND
SNeet
$
BE APPLIED AT A RATE OF 20 POUNDS PER ACRE. STRAW WILL THEN BE APPLIED AT A RATE OF 50 BALES PER ACRE.
Ra
�i
N.Mar.
DRAMING SCKES SNOWY BASED pl 221N• DRAMING
C-501'
3
X
4
5

Related Calculations and Modeling
Ditch Plug Locations
Ditch plug locations were selected based upon whether the area of the site was very flat or more sloped.
Extra ditch plugs were also included for additional protection in case any were to fail. Figure 1 shows the
plug locations and topographic data. Where ditches run through flatter areas, plugs will be placed where
subtle ridges exist on the site to confine water between the ridges and to drive as much of the overland
flow as possible to lower elevations, where the soil and vegetation will be undisturbed, and avoiding
flow at the plugs. In places where the topography is more sloped, plugs will be spaced more tightly so
that the difference in elevation between adjacent plugs along a ditch will never be more than one foot.
This will limit the hydraulic gradient across the plugs to reduce seepage and will limit the amount of
water table drawdown that could occur in adjacent restored wetland areas.
To evaluate the significance of any seepage through the plugs, seepage rates were estimated and then
compared to estimated evaporation rates from lengths of open channel. Seepage rate was calculated
assuming one foot of hydraulic gradient across a ditch plug, a conservative plug hydraulic conductivity of
1 inch per hour, an average plug length over the plug depth of 20 feet, and a conservative plug
rectangular cross-section of 8 by 20 feet. A seepage rate of 0.66 cubic feet per hour was calculated. To
estimate the ditch evaporation rate, a surface area of 1500 feet by 20 feet was assumed and an
evaporation rate of 0.25 inches per day. This resulted in an evaporation rate of 26 cubic feet per hour,
which was 40 times the seepage rate through the plug.

Figure 1. Map of ditch plug locations (circled in red) with topography

XPSWMM Modeling to Evaluate the Required Level of Erosion Control Protection at the Plug Locations
In order to gage the potential for erosion throughout the project site and at the proposed ditch plug
locations, a 2-dimensional XPSWMM model was created. The model area was defined through a
network of 10 -foot grid cells. Soil parameters were estimated from the soil survey report and from other
data collected for the site. Surface roughness parameters were also defined across the model. A
topographic surface was created within the model using Quality Level 2 (QL2) LiDAR data collected from
the North Carolina Floodplain Mapping Program. NRCS Type 3 design rainfalls were then simulated on all
of the cells where runoff was calculated during each time step of the simulation. Surface water
movement across the model, from cell to cell, was then analyzed. Model outputs included time series
flow rates in selected areas, and for each cell, at each time step the following three metrics were
predicted: water surface elevation, water depth and velocity. Figures 2 and 3 show maximum water
depth results for the 100 -year, 24-hour storm, assuming no infiltration was allowed. Results were
evaluated for the 2, 10 and 100 -year rainfall events for: 1) design of erosion control surface protection
before vegetation has been established and 2) following construction when vegetation has been
established. Maximum water velocities and were observed across the study area, paying special
attention to proposed ditch plug locations. Low velocities were observed during all three storm events,
suggesting that erosive forces at the plug locations will be minor. Maximum water velocities were below
0.2 ft/s at all ditch plug location during the 2 -year and 10 -year events, and all velocities were less than
0.3 ft/s during the 100 -year event, even when assuming no infiltration could occur. Given these
velocities, it was decided that seed and straw would be adequate erosion control to stabilize the site at
plug locations.

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