20081475 Ver 2_401 Application_20130213

08-14-75 ua-
LETTER OF TRANSMITTAL PBWK
WDICKSON
community infrastructure consultants
720 Corporate Center Drive Raleigh, North Carolina 27607 919.782.0495 tel. [phone] fax
TO: NCDWQ DATE: 2/8/2013
WBSCP Unit
512 North Salisbury St
Raleigh, NC 27604
ATTENTION:
RE: Lail Court Culvert
60319.00.RA
We are sending via:
02 n Day
❑ Regular Mail
❑ Pick -up
❑ Hand Delivered
The following items:
❑ Correspondence
❑ Plans
❑ Specifications
® Other as listed below:
COPIES I DATE I NO. DESCRIPTION
5 1 2/8/13 1 1 1 PCN Package
THESE ARE TRANSMITTED as checked below:
® For Approval ❑ As Requested ❑ Approved as Submitted ❑ Returned for Corrections
❑ For Your Use ® For Review ❑ Approved as Noted ❑ Forward to Subcontractor
COPY TO: 60319.00.RA
SIGNED: Z-V, �
Tom t ay

�LJWLXg
o 151� -r
Office Use Only:
Corps action ID no.
DWQ project no.
Form Version 1.4 January 2009
Pre - Construction Notification (PCN) Form
A. Applicant Information
1. Processing
1 a. Type(s) of approval sought from the Corps:
© Section 404 Permit ❑ Section 10 Permit
1 b. Specify Nationwide Permit (NWP) number: 3 or General Permit (GP) number:
1c. Has the NWP or GP number been verified by the Corps?
® Yes ❑ No
1 d. Type(s) of approval sought from the DWQ (check all that apply):
Q 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
because written approval is not required?
For the record only for DWQ
401 Certification:
❑ Yes ® No
For the record only for Corps Permit:
❑ Yes © 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 © No
1g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h
below.
❑ Yes ® No
1 h. Is the project located within a NC DCM Area of Environmental Concern (AEC)?
❑ Yes © No
2. Project Information
2a. Name of project:
Lail Court Culvert Improvements
2b. County:
Wake
2c. Nearest municipality / town:
Raleigh
2d. Subdivision name:
2e. NCDOT only, T.I.P. or state project no:
3. Owner Information B j 0
3a. Name(s) on Recorded Deed:
M&F3;4W
I
3b. Deed Book and Page No.
3c. Responsible Party (for LLC if
applicable):
City of Raleigh Public Works Department, Carl Dawson, PE
3d. Street address:
222 West Hargett Street
3e. City, state, zip:
Raleigh, NC 27602 -0590
3f. Telephone no.:
(919) 996 -3030
3g. Fax no.:
(919) 996 -7638
3h. Email address: I
cad.dawson @raleighnc.gov
Page 1 of 10
PCN Form — Version 1.4 January 2009

4. Applicant Information (if different from owner)
4a. Applicant is:
❑ Agent ❑ Other, specify:
4b. Name:
4c. Business name
(if applicable):
4d. Street address:
4e. City, state, zip:
4f. Telephone no.:
4g. Fax no.:
4h. Email address:
5. AgentlConsultant Information (if applicable)
5a. Name:
Tom Murray
5b. Business name
(if applicable):
WK Dickson
5c. Street address:
720 Corporate Center Drive
5d. City, state, zip:
Raleigh, NC 27607
5e. Telephone no.:
919 - 782 -0495
5f. Fax no.:
919- 782 -9672
5g. Email address:
tmurray @wkdickson.com
Page 2 of 10

B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID):
1783574025
1 b. Site coordinates (in decimal degrees):
I Latitude: 35.776883 Longitude: - 78.70333
1c. Property size:
0.32 acres
2. Surface Waters
2a. Name of nearest body of water to proposed project:
Simmons Branch
2b. Water Quality Classification of nearest receiving water:
QNSW
2c. River basin:
03020201 (Neuse River Basin)
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:
See attached project narrative.
3b. List the total estimated acreage of all existing wetlands on the property: 0
3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: 50
3d. Explain the purpose of the proposed project:
The project will improve channel capacity and reduce flooding as well as minimizing loss of land to the landowner.
3e. Describe the overall project in detail, including the type of equipment to be used:
See attached project detail.
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the
Corps or State been requested or obtained for this property /
project (including all 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 Q Final
4c. If yes, who delineated the jurisdictional areas?
Name (if known): Daniel Ingram
Agency /Consultant Company: WK Dickson
Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
2005
5. Project History
5a. Have permits or certifications been requested or obtained for
this project (including all prior phases) in the past?
© Yes ❑ No ❑ Unknown
5b. If yes, explain in detail according to "help file" instructions.
The project's existing permit (Action ID 20082782) expired on 3/18/2012, before construction began. See attached narrative for additional information.
6. Future Project Plans
6a. Is this a phased project?
❑ Yes ❑X No
6b. If yes, explain.
Page 3 of 10
PCN Form — Version 1.4 January 2009

C. Proposed Impacts Inventory
1. Impacts Summary
1a. Which sections were completed below for your project (check all that apply):
❑ Wetlands ® Streams — tributaries ❑ Buffers ❑ 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
Tem ora
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:
2h. Comments:
No wetland impacts are anticipated.
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
3c.
Stream name
3d.
Perennial (PER) or
intermittent (INT)?
3e.
Type of
jurisdiction
3f.
Average
stream
width
(feet)
3g.
Impact
length
(linear
feet)
S1 P
Culvert
Simmons Branch
PER
Corps
15
2
S2 T
temporary crossing
Simmons Branch
PER
Corps
15
30
S3 P
Culvert
Simmons Branch
PER
Corps
15
15
S4 -
Choose one
-
-
S5 -
Choose one
-
S6 -
Choose one
-
3h. Total stream and tributary impacts
47
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
Tem ora
4b.
Name of waterbody
(if applicable)
4c.
Type of impact
4d.
Waterbody
type
4e.
Area of impact (acres)
01 -
Choose one
Choose
02 -
Choose one
Choose
03 -
Choose one
Choose
04 -
Choose one
Choose
4f. Total open water impacts
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?
0 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
131 P
Culvert Installation
Simmons Branch
No
243
B2 T
Culvert Installation
Simmons Branch
No
12,051
1,206
B3 -
Yes/No
B4 -
Yes/No
B5 -
Yes/No
B6 -
Yes/No
6h. Total Buffer Impacts:
12,294
1,206
6i. Comments:
Page 5 of 10

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
All impacts to waters of the US have been avoided and minimized to the maximum extent practicable. The attached narrative describes avoidance and
minimization in detail.
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
See attached narrative.
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?
❑ Yes ❑X No
2b. If yes, mitigation is required by (check all that apply):
❑ DWQ ❑ Corps
2c. If yes, which mitigation option will be used for this
project?
❑ Mitigation bank
❑ Payment to in -lieu fee program
❑ Permittee Responsible Mitigation
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 In4ieu 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
Yes X No
buffer mitigation?
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
Reason for impact
Total impact
Multiplier
Required mitigation
(square feet)
(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).
Pursuant to 15A NCAC 02B .0233 (6) "Table of Uses," because the road crossing will impact less than 40 linear feet of riparian
6h. Comments: buffer, it is allowable.
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 ❑ 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.
Not required. Temporary erosion and sedimentation control permit has been secured.
❑ 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:
No new (additional) impervious surface. Temporary erosion and sedimentation control permit has been secured.
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 Management Plan?
3. Certified Local Government Stormwater Review
3a. In which local government's jurisdiction is this project?
❑ 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 ❑ No
attached?
4. DWQ Stormwater Program Review
❑Coastal counties
❑HQW
4a. Which of the following state - implemented stormwater management programs apply
❑ORW
(check all that apply):
E] Session Law 2006 -246
❑ Other:
4b. Has the approved Stormwater Management Plan with proof of approval been
❑ Yes ❑ No
attached?
S. DWQ 401 Unit Stormwater Review
5a. Does the Stormwater Management Plan meet the appropriate requirements?
❑X 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)
la. Does the project involve an expenditure of public (federal /state/local) funds or the
❑X Yes ❑ 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
[]Yes X❑ No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1c. 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 ©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
❑Yes ® 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.
NA
Page 9 of 10
PCN Form — Version 1.4 January 2009

• J . 011
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.
-
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
Natural Heritage Program and USFWS websites.
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat?
❑ Yes ® No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
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
❑ 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?
SHPO
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA- designated 100 -year floodplain?
❑ Yes Q No
8b. If yes, explain how project meets FEMA requirements:
Timothy,
8c. What source(s) did you use to make the floodplain determination?
NC Flood Maps (floodmaps.nc.gov)
Carl R. Dawson, PE
Public Works Director
City of Raleigh Public Works Dept.
2
a'
Applicant/Agent's Printed Name
Applicant/Agents Signa
Date
(Agents signature is valid only if an a tion
letter from the applicant is provirdl
Imp -
Page 10 of 10

PRE - CONSTRUCTION NOTIFICATION
NATIONWIDE PERMIT 3
PROPOSED LAIL COURT CULVERT IMPROVEMENT
SIMMONS BRANCH DRAINAGE BASIN
WAKE COUNTY, NORTH CAROLINA
PROJECT NARRATIVE
Introduction
The Lail Court culvert improvement is part of a watershed wide plan for Simmons Branch
to reduce roadway and structure flooding in a predominantly residential neighborhood in
West Raleigh. The Lail Court roadway currently overtops during the 2 -year 24 -hour storm
event based on built out land use conditions. Residential flooding occurs at five houses
within the vicinity of the Lail Court and Swift Drive culvert crossings based on survey
elevations provide by the City of Raleigh. The proposed project is designed to convey the
10 -year 24 -hour storm based on future land use conditions. The proposed culvert
improvement described herein will substantially reduce roadway flooding in the project
area and reduce residential flooding. Reducing roadway flooding at Lail Court is
particularly important as Lail court is the only point for emergency access to five homes.
The culvert improvements at Lail Court are part of a series of improvements throughout the
Simmons Branch Watershed to reduce roadway and residential flooding. Completion of
this project would affect areas under U.S. Army Corps of Engineers (USACE) jurisdiction,
specifically 2 linear feet of permanent stream impact for culvert replacement and 45 linear
feet of stream for a temporary detour and utility crossing. These impacts are unavoidable
and required to provide access, hydraulic function, and stability.
Prior Project History
The impacts associated with the Lail Court culvert upgrade were previously permitted on
11/17/2008 under a Nationwide 3 Permit (Action ID 200802782). The DWQ Project# is
08 -1475. Initial approval for the 401 Water Quality Certification was issued on November
5, 2008. The Nationwide 3 permit was extended on 12/13/2010 to have an expiration
date of 3/18/2012. Further email and phone correspondence with James Shern and David
Shaeffer with the Army Corps of Engineers allowed extension of the permits to 3/18/2013
if all impacts had been constructed by that date. While the City of Raleigh had every
intention of completing the impacts by 3/18/2013, unavoidable delays related to private
easement acquisition, and private utility conflicts resulted in the delay of the Contractor's
notice to proceed until 11/26/12. The anticipated end date of the construction contract is
9/9/13. Due to the unavoidable delays, the proposed impacts will not be completed by
3/18/2013.
Site Location and Description
Simmons Branch drains approximately 1.2 mil from Western Boulevard to south of Avent
Ferry Road (Figure 1). The stream discharges to Walnut Creek just south of Lake Johnson.
While commercial areas in the vicinity of Western Boulevard have developed in recent

Lail Culvert Improvements Page 2
years, the majority of land use along Lail Court is residential. Rain events in 2001 caused
significant residential flooding in the watershed precipitating the "Simmons Branch
Drainage Study ", completed in 2002. Recommended project locations from the 2002
study are intended to provide a 10 -year level of service at major roadway crossings
assuming built out conditions in the watershed. The latitude and longitude coordinates are
35.7768833 °N - 78.70333 0W.
The existing culvert at Lail Court consists of 40 linear feet of twin 60" reinforced concrete
pipe. Catch basins located directly on top of the southern barrel collect street runoff and
discharge directly to the culvert. Concrete headwalls with wings exist on the upstream and
downstream ends.
The existing cover over the culvert is limited, which will prevent constructing taller
culverts at this location. Several utilities are located along Lail Court that will need to be
moved or temporarily moved during construction. The most notable utility conflict is an
8" sanitary sewer pipe that runs directly under the existing culvert. The 8" sanitary sewer
line will be relocated upstream of the culvert under Simmons Branch.
Construction of any culvert improvements along Lail Court will require a temporary detour
to maintain traffic into the cul-de -sac. Lail Court is the only access point for emergency
vehicles for five residences.
The existing channel between Lail Court and Swift drive is 150 linear feet in length and an
average width of 20 feet. Approximately 50 percent of the channel banks are unstable and
showing signs of erosion.
The topography on the property consists of moderately sloping terrain. Simmons Branch
flows from west to east through the middle of the property. The property generally drains
to the south, away from Lail Court, eventually draining into Walnut Creek. The site is
located in the Neuse River basin (HUC 03020201).
Project Description and Purpose
The purpose of the proposed project is to increase channel and culvert efficiency and
capacity to reduce roadway flooding and flood risk to existing structures. Lail Court is the
only access point to five homes and road closures due to flooding are a public safety
concern. Five homes in the project area are subject to flooding as well. The proposed
project is part of a watershed level initiative to reduce flooding. Bank stability
improvements will also decrease erosion and improve water quality and aquatic habitat.
Analysis of the Lail Court hydraulic models resulted in a 25' x 5' opening required to pass
the 10 -year 24 -hour storm event. A combination of a single 9' x 6' and twin 8' x 6'
reinforced box culverts (buried 1.0 foot) is recommended with one culvert conveying the
base flow from the stream. The existing catch basins located directly on top of the Lail
Court culverts will be removed and two new catch basins installed south of the culverts.
The catch basins will discharge to an 18" RCP that will discharge into the side of the
proposed box culverts rather than the top of the culverts. Prefabricating a hole in the top

Lail Culvert Improvements Page 3
of the box culvert for a catch basin discharge carries a greater risk during installation if the
hole is not located in the correct spot.
The sanitary sewer along Lail Court will be relocated from underneath the drainage
culvert. The proposed line will be relocated upstream of the culvert. Crossing the stream
upstream of the culvert rather than downstream will allow for more coverage on the
sanitary pipe when it crosses under the stream. Approximately 1.7 feet of cover will be
provided upstream of the culvert and approximately 1.0 feet of cover would be provided
downstream of the culvert. Public Utilities requires a minimum of 1.0 feet of cover on
sanitary crossings under stream channels. The new sanitary sewer pipe will be enclosed in
steel encasement and will cross the stream perpendicularly.
Channel improvements between Lail Court and Swift Drive include widening of the
channel above the OHWM to lower the 10 year water surface elevation to the existing top
of bank elevation and to tie the channel banks into the wider culverts at Lail Court and
Swift Drive. A Floodplain bench will be graded on the right side of the stream at the
approximate elevation of the 2 -year peak water surface elevation. Live stakes will be
planted along either side of the stream for stabilization purposes.
Equipment to be used will include typical earthmoving equipment and construction
equipment.
Jurisdictional Waters/Wetlands of the U.S.
One perennial stream is located in the central portion of the property (Simmons Branch).
This stream is a tributary to Walnut Creek. Simmons Branch in the vicinity of Lail Court is
a highly impaired urban channel. Upstream of the Lail Court culvert the channel is
approximately 15 feet wide with steep eroding banks confined between Swift Drive and
maintained lawns. Downstream of the culvert Simmons branch is confined between Swift
Drive and maintained lawns (Figure 2). The banks are unstable and eroding in many
locations. No wetlands are present in the project area.
Avoidance and Minimization
Storm water design requirements were obtained from the City of Raleigh stormwater
design manual entitled "City of Raleigh Stormwater Management Design Manual" dated
January 2002 and City of Raleigh code Section 10 -3053. Design standards include:
• Systems must pass the 10 -year 24-hour storm
• Culverts for more than 25 acres must have at least 2 feet of freeboard for the
10 -year 24-hour storm and 6 inch of freeboard for the 100 -year 24-hour
storm
• Pipe slopes shall be no less than 0.5% and no greater than 12%
• Minimum cover outside R.O.W is 0.5 feet
• Side slopes for vegetated channels should be no more than 3 to
Since the culvert improvement will be a retrofit in a predominantly developed area, some
of the design standards may not be feasible or cost effective. At a minimum the proposed

Lail Culvert Improvements Page 4
culvert improvement was designed to convey the 10 -year 24 -hour storm based on future
land use conditions.
Due to stream location, access considerations, and footprint requirements, impacts to
streams are unavoidable. The proposed culvert is 2 feet longer than the existing culvert,
minimizing impacts from the upgrade of the new culvert. The roadway width and fill
slopes have been minimized while still fulfilling geometry and traffic considerations.
Stream disturbance width will be minimized and all conditions of NWP 3 will be
complied with.
jurisdictional Impacts
The total area of jurisdictional waters of the U.S. to be impacted by the proposed culvert
upgrade project is 0.001 acres of permanent stream fill and 0.015 acres of temporary
stream fi I I.
The permanent stream fill is generated by an additional 2 feet of culvert length at the Lail
Court road crossing. The impact is required due to geometry constraints for the culvert
upgrade, accessing the Lail Court ROW, and is located adjacent to the stream fill. The
temporary impact is for 30 linear feet of fill for a temporary detour during construction and
15 linear feet due to a utility relocation under Simmons Branch. Lail Court is a cul-de -sac
and vehicular access must be maintained for residential and emergency vehicles. The
existing sanitary sewer line is in conflict with the existing storm culverts and needs to be
relocated to avoid conflict with the proposed culverts.
Best Management Practices
Prior to the beginning of any construction activities, the applicant will implement Best
Management Practices (BMP's) to minimize erosion and migration of sediments into
affected waterways (streams and wetlands) during the construction phase. A detailed
Erosion Control Plan was developed and approved on November 11, 2011. It included
appropriate erosion and siltation control devices placed between the construction area and
adjacent waterways. These devices included the use of gravel construction entrances,
temporary seeding and mulching, silt fencing, check dams, inlet sediment filters, coir fiber
matting, and dewatering silt bags. Monitoring of BMP's will take place in accordance with
the requirements of the North Carolina NPDES general permit for construction activity to
assure that the erosion and sediment control devices are installed properly and maintained
in a functioning condition.
Compensatory Mitigation
Compensatory mitigation for this project is not proposed. On -site mitigative measures
include minimization of impacts, use of natural channel design techniques to provide bed
and bank stability, native plantings on stream banks, and strict erosion control measures.
Riparian and Watershed Buffers
Impacts to the riparian buffer will be minimal with only the removal of some small trees
along the stream banks and in the vicinity of the culvert upgrade. The riparian buffer has
an existing land use of maintained lawn and right -of -way. The culvert upgrade at Lail
Court does not result in an increase in impervious surfaces. The trees that are removed

Lail Culvert Improvements
Page 5
will be replaced and the stream banks replanted with appropriate native species. The
culvert will cross the road at a 90 degree angle. No riparian buffer mitigation is proposed.
Due to bank stabilization and riparian plantings the riparian buffer will be enhanced as a
result of the proposed project.
Floodplain Encroachment
The proposed project will not encroach upon the 100 -year floodplain and is not in a flood
hazard area.
Threatened and Endangered Species
Table 1 below lists threatened and endangered species in Wake County. No protected
species or suitable habitat was observed in the project area. The proposed project is not
likely to adversely affect any protected species.
Table 1. Threatened and endangered species in project area
Common Name
Scientific Name
Federal Status
Record Status
Vertebrates
Red - cockaded woodpecker
Picoides borealis
Endangered
Historic
Invertebrates
Dwarf wedgemussel
Alasmidonta heterodon
Endangered
Current
Vascular Plants
Michaux's sumac Rhus michauxii Endangered
Current
Cultural and Historical Resources
A database search of National Register of Historic Properties indicated no listed historic
properties in the project vicinity. Additionally, a site visit determined that no existing
structures will be impacted by the proposed project.

DICKSON
WATERSHED SCIENCES
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