20081475 Ver 1_401 Application_20080908

I ft WK
WDICKSON
community infrastructure consultants
September 25, 2008
Mr. Ian McMillan
Division of Water Quality
401 Wetlands Unit
2321 Crabtree Blvd., Suite 250
Raleigh, NC 27604
08-1475
3 P.&V
RE: PCN's for Kaplan Drive, Lail Court, and Swift Drive Culvert Replacements
60319.00. RA
Dear Mr. McMi Ilan:
The attached PCN's for the Kaplan Drive Culvert Replacement, Lail Court Culvert Replacement, and
Swift Drive Culvert Replacement are presented by WK Dickson on behalf of The City of Raleigh
(Applicant). The goals of the projects are to reduce the frequency of residential flooding for private
properties and public roads and to stabilize eroding stream banks. One check totaling $720 for the
three PCN submittals is also enclosed.
Please feel free to contact me if you have any questions regarding this PCN submittal
([e-mail]). Thank you for your prompt attention to this important project.
Sincerely,
W.K. Dickson & Co., Inc.
5w?)Yllwf
Daniel Ingram
Project Scientist
cc: James Shern, USACE
Craig Deal, Project Manager
Tom Murray, PE, Project Manager
File: 60319.00. RA
720 Corporate Center Drive
Raleigh, NC 27607
Tel. [phone]
Fax [phone]
www.wkdickson.com
X+1 1 # t
4 t ; ,r
Sit
Transportation • Water Resources + Urban Development • Geomatics
PhWK
WDICKSON
community infrastructure consultants
September 25, 2008
Mr. James Sherri
USACE Raleigh Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
RE: PCN's for Kaplan Drive, Lail Court, and Swift Drive Culvert Replacements
60319.00.RA
Dear Mr. Shern:
The attached PCN's for the Kaplan Drive Culvert Replacement, Lail Court Culvert Replacement, and
Swift Drive Culvert Replacement are presented by WK Dickson on behalf of The City of Raleigh
(Applicant). The goals of the projects are to reduce the frequency of residential flooding for private
properties and public roads and to stabilize eroding stream banks.
Please feel free to contact me if you have any questions regarding this PCN submittal
([e-mail]). Thank you for your prompt attention to this important project.
Sincerely,
W.K. Dickson & Co., Inc.
4 A)- 0
Daniel Ingram
Project Scientist
cc: Ian McMillan, NCDWQ 401/Wetlands Unit
Craig Deal, Project Manager
Tom Murray, PE, Project Manager
File: 60319.00. RA
720 Corporate Center Drive
Raleigh, NC 27607
Tel. [phone]
Fax [phone]
www.wkdickson.com
Transportation • Water Resources • Urban Development • Geomatics
Personal Account Information Redacted
Office Use Only: Form Version March 05
0 8- 1 7 5
USACE Action ID No. DWQ No. 4
(If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".)
1. Processing 'A I
1. Check all of the approval(s) requested for this project:
® Section 404 Permit ® Riparian or Watershed Buffer Rules
? Section 10 Permit ? Isolated Wetland Permit from DWQ
® 401 Water Quality Certification ? Express 401 Water Quality. Certification
2. Nationwide, Regional or General Permit Number(s) Requested: NWP 3, GC 3687
3. If this notification is solely a courtesy copy because written approval for the 401 Certification
is not required, check here: ?
4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed
for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII,
and check here: ?
5. If your project is located in any of North Carolina's twenty coastal counties (listed on page
4), and the project is within a North Carolina Division of Coastal Management Area of
Environmental Concern (see the top of page 2 for further details), check
II. Applicant Information
S E F 6 2008
1. Owner/Applicant Information aESg.;/,!ATER QUALITY
Name: City of Raleigh yL.TL6 1135A AND STCSRNO,?aTw?BR'.
Mailing Address: Public Works Department
222 West Hargett Street
Raleigh, NC 27602-0590
Attn: Carl Dawson, P.E.
Telephone Number: [phone] Fax Number: [phone]
E-mail Address: [e-mail]
2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter
must be attached if the Agent has signatory authority for the owner/applicant.)
Name: Daniel Ingram
Company Affiliation: WK Dickson
Mailing Address: 720 Corporate Center Drive
Raleigh, NC 27607
Telephone Number: 919-782-0495 Fax Number: 919-782-9672
E-mail Address: dingramOwkdickson.com
Updated 11/1/2005
Page 5 of 13
III. Project Information
Attach a vicinity map clearly showing the location of the property with respect to local
landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property
boundaries and development plans in relation to surrounding properties. Both the vicinity map
and site plan must include a scale and north arrow. The specific footprints of all buildings,
impervious surfaces, or other facilities must be included. If possible, the maps and plans should
include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property
boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion,
so long as the property is clearly defined. For administrative and distribution purposes, the
USACE requires information to be submitted on sheets no larger than 11 by 17-inch format;
however, DWQ may accept paperwork of any size. DWQ prefers full-size construction
drawings rather than a sequential sheet version of the full-size plans. If full-size plans are
reduced to a small scale such that the final version is illegible, the applicant will be informed that
the project has been placed on hold until decipherable maps are provided.
1. Name ofproject: Lail Court Culvert Improvements
2. T.I.P. Project Number or State Project Number (NCDOT Only):
3. Property Identification Number (Tax PIN): 783574025 (City of Raleigh)
4. Location
County: Wake
Nearest Town: Raleigh
Subdivision name (include phase/lot number):
Directions to site (include road numbers/names, landmarks, etc.): Take the Gorman Street exit
from 1-40 and proceed north at the light at the end of the ramp. Take a left onto Avent Ferry Road and
go approximately 2.0 miles west. Take a right onto Swift Drive and go approximately 0.5 miles, Lail
Court is the second left off of Swift Drive.
5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that
separately lists the coordinates for each crossing of a distinct waterbody.)
Decimal Degrees (6 digits minimum): 35.7768833 ON -78.70333 °W
6. Property size (acres): 0.32 (area of disturbance)
7. Name of nearest receiving body of water: Simmons Branch
8. River Basin: Neuse River Basin (03020201
(Note - this must be one of North Carolina's seventeen designated major river basins. The
River Basin map is available at http://h2o.enr.state.nc.us/admin/mgps/.)
9. Describe'the existing conditions on the site and general land usein the vicinity of the project
at the time of this application: The attached project narrative describes existing conditions.
10. Describe the overall project in detail, including the type of equipment to be used: The City of
Raleigh will improve the culvert at Lail Court by installing twin reinforced 8'x6' box culverts and one
Updated 11/1/2005
Page 6 of 13
9'x6' reinforced concrete box culvert. The 9'x6' culvert will be located between the two 8'6' culverts,
buried approximately one foot and baffled to convey the base flow. The dual 8'x6' culverts will be
buried and baffled to confine the base flow. The full width of the three culverts will only be utilized for
high flow events. A temporary fill of 30LF will be required for a temporary detour to maintain traffic on
Lail Court. Lail Court is a cul-de-Sac public road and emergency access and resident access must be
maintained. A sanitary sewer utility line will be rerouted under the stream approximately 35 feet
upstream of the culvert. Natural channel design techniques will be utilized to provide bed and bank
stability. These include a rock cross vane, riffle grade control, and reshaping and planting stream banks.
Bank stabilization will be performed on approximately 150 LF of channel between Lail Court and Swift
Drive. The stabilization will be performed above the OHWM and include regrading the banks and using
live stakes and native plantings for stabilization. Equipment to be used will include typical earthmoving
equipment and construction equipment.
11. Explain the purpose of the proposed work: The project will improve channel capacity, reduce
flooding, and stabilize banks.
IV. Prior Project History
If jurisdictional determinations and/or permits have been requested and/or obtained for this
project (including all prior phases of the same subdivision) in the past, please explain. Include
the USACE Action ID Number, DWQ Project Number, application date, and date permits and
certifications were issued or withdrawn. Provide photocopies of previously issued permits,
certifications or other useful information. Describe previously approved wetland, stream and
buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project,
list and describe permits issued for prior segments of the same T.I.P. project, along with
construction schedules. No permits exist at this time for this project.
V. Future Project Plans
Are any future permit requests anticipated for this project? If so, describe the anticipated work,
and provide justification for the exclusion of this work from the current application.
None at this time.
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
wetlands, open water, and stream channels associated with the project. Each impact must be
listed separately in the tables below (e.g., culvert installation should be listed separately from
riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts,
permanent and temporary, must be listed, and must be labeled and clearly identifiable on an
accompanying site plan. All wetlands and waters, and all streams: (intermittent and perennial)
should be shown on a delineation map, whether or not impacts are proposed to these systems.
Wetland and stream evaluation and delineation forms should be included as appropriate.
Photographs may be included at the applicant's discretion. If this proposed impact is strictly for
Updated 11/1/2005
Page 7 of 13
wetland or stream mitigation, list and describe the impact in Section VIII below. If additional
space is needed for listing or description, please attach a separate sheet.
1. Provide a written description of the proposed impacts: Placement of the new culvert will impact 2
LF of stream channel upstream of the existing culvert. There is also 30LF of temporary impact from a
construction detour to maintain emergency access and residential traffic. An additional 15LF of
temporary impact will occur due to the installation of the 8" sanitary sewer line.
2. Individually list wetland impacts. Types of impacts include, but are not limited to
mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams,
separately list impacts due to both structure and flooding.
Wetland Impact
Site Number
(indicate on map)
Type of Impact Type of Wetland
(e.g., forested, marsh,
herbaceous, bog, etc.) Located within
100-year
Floodplain
es/no) Distance to
Nearest
Stream
(linear feet) Area of
Impact
(acres)

Total Wetland Impact (acres)
3. List the total acreage (estimated) of all existing wetlands on the property:
4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary
impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam
construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib
walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed,
plans and profiles showing the linear footprint for both the original and relocated streams
must be included. To calculate acreage, multiply length X width, then divide by 43,560.
Stream Impact
Perennial Average Impact Area of
Number Stream Name Type of Impact
?
Intermittent? Stream Width Length Impact
(indicate on ma Before Impact (linear feet) (acres)
1 Simmons Branch Placement of Perennial 15 2 0
001
Culvert .

2 Simmons Branch Temporary
Perennial
15
30
01
0
(Upstream) Crossing .
3 Simmons Branch Utility line Perennial 15 15 0
005
(Upstream) (temporary) .
Total Stream Impact (by length and acreage) - 47 0.016
5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic
Ocean and any other water of the U.S.). Open water impacts include, but are not limited to
fill, excavation, dredging, flooding, drainage, bulkheads, etc.
Updated 11/12005
Page 8 of 13
Open Water Impact
Site Number
(indicate on ma) Name of Waterbody

(if applicable)
Type of Impact Type of Waterbody
(lake, pond, estuary, sound, bay,
ocean, etc.) Area of
Impact
(acres)

Total Open Water Impact (acres)
6. List the cumulative impact to all Waters of the U.S. resulting from the project:
Stream Impact (acres): 0.016
Wetland Impact (acres):
Open Water Impact (acres):
Total Impact to Waters of the U.S. (acres)
Total Stream Impact (linear feet): 2 (permanent)
45 (temporary)
7. Isolated Waters
Do any isolated waters exist on the property? ? Yes ® No
Describe all impacts to isolated waters, and include the type of water (wetland or stream) and
the size of the proposed impact (acres or linear feet). Please note that this section only
applies to waters that have specifically been determined to be isolated by the USACE.
8. Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts should be
included above in the wetland and stream impact sections. Also, the proposed pond should
be described here and illustrated on any maps included with this application.
Pond to be created in (check all that apply): ? uplands ? stream ? wetlands
Describe the method of construction (e.g., dam/embankment, excavation, installation of
draw-down valve or spillway, etc.):
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.):
Current land use in the vicinity of the pond:
Size of watershed draining to pond: Expected pond surface area:
VII. Impact Justification (Avoidance and Minimization)
Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide
information related to site constraints such as topography, building ordinances, accessibility, and
financial viability of the project. The applicant may attach drawings of alternative, lower-impact
site layouts, and explain why these design options were not feasible. Also discuss how impacts
were minimized once the desired site plan was developed. If applicable, discuss construction
techniques to be followed during construction to reduce impacts. All impacts to waters of the U.S.
have been avoided and minimized to the maximum extent practicable. The attached project narrative
Updated 11/1/2005
Page 9 of 13
describes avoidance and minimization in detail. All conditions of NWP 3 will be satisfied to further
minimize impacts
VIII. Mitigation
DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC
Division of Water Quality for projects involving greater than or equal to one acre of impacts to
freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial
streams.
USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide
Permits, published in the Federal Register on January 15, 2002, mitigation will be required when
necessary to ensure that adverse effects to the aquatic environment are minimal. Factors
including size and type of proposed impact and function and relative value of the impacted
aquatic resource will be considered in determining acceptability of appropriate and practicable
mitigation as proposed. Examples of mitigation that may be appropriate and practicable include,
but are not limited to: reducing the size of the project; establishing and maintaining wetland
and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of
aquatic resource functions and values by creating, restoring, enhancing, or preserving similar
functions and values, preferable in the same watershed.
If mitigation is required for this project, a copy of the mitigation plan must be attached in order
for USACE or DWQ to consider the application complete for processing. Any application
lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete.
An applicant may also choose to review the current guidelines for stream restoration in DWQ's
Draft Technical Guide for Stream Work in North Carolina (see DWQ website for most current
version.).
1. Provide a brief description of the proposed mitigation plan. The description should provide
as much information as possible, including, but not limited to: site location (attach directions
and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet)
of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view,
preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a
description of the current site conditions and proposed method of construction. Please attach
a separate sheet if more space is needed.
The proposed project is below mitigation thresholds and no off-site mitigation is proposed. On-site
mitigative measures include minimizing impacts, use of natural channel design techniques for bed and
bank stabilization, re-planting native species, and strict erosion control measures.
2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement
Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at
[phone] to determine availability, and written approval from the NCEEP indicating
that they are will to accept payment for the mitigation must be attached to this form. For
additional information regarding the application process for the NCEEP, check the NCEEP
Updated 11/1/2005
Page 10 of 13
website at http://www.nceep.net/pages/inlieureplace.htm. If use of the NCEEP is proposed,
please check the appropriate box on page five and provide the following information:
Amount of stream mitigation requested (linear feet):
Amount of buffer mitigation requested (square feet):
Amount of Riparian wetland mitigation requested (acres):
Amount of Non-riparian wetland mitigation requested (acres):
Amount of Coastal wetland mitigation requested (acres):
IX. Environmental Documentation (required by DWQ)
Does the project involve an expenditure of public (federal/state/local) funds or the use of
public (federal/state) land? Yes ® No ?
2. If yes, does the project require preparation of an environmental document pursuant to the
requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)?
Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA
coordinator at [phone] to review current thresholds for environmental documentation.
Yes ? No
3. If yes, has the document review been finalized by the State Clearinghouse? If so, please
attach a copy of the NEPA or SEPA final approval letter. Yes ? No ?
X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ)
It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to
required state and local buffers associated with the project. The applicant must also provide
justification for these impacts in Section VII above. All proposed impacts must be listed herein,
and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a
map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ
Regional Office may be included as appropriate. Photographs may also be included at the
applicant's discretion.
Will the project impact
(Meuse), 15A NCAC 2B
2B .0250 (Randleman
identify)?
protected riparian buffers identified within 15A NCAC 2B .0233
.0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC
Zules and Water Supply Buffer Requirements), or other (please
Yes ® No ?
2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers.
If buffer mitigation is required calculate the required amount of mitigation by applying the
buffer multipliers.
Updated 11/1/2005
Page 11 of 13
Zone* (s uImpct are feet) Multiplier
Required
Mitigation
1 10558 3 (2 for Catawba)
2 0 1.5
Total 10558
* Zone 1 extends out 30 feet perpendicular from the top of the near bank of channel; Zone 2 extends an
additional 20 feet from the edge of Zone 1.
3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e.,
Donation of Property, Riparian Buffer Restoration / Enhancement, or Payment into the
Riparian Buffer Restoration Fund). Please attach all appropriate information as identified
within 15A NCAC 2B .0242 or .0244, or .0260. No riparian buffer mitigation is proposed.
Impacted buffers are not forested and have an existing residential land use. No impacts to forested
buffers are proposed. Disturbed riparian areas will re-planted with appropriate native species on the
stream bank. Residential lawns and right-of-way will be stabilized with turf grasses. The project is
maintenance of an existing structure and will not result in a net increase of impervious surface.
XI. Stormwater (required by DWQ)
Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss stormwater
controls proposed in order to protect surface waters and wetlands downstream from the property. If
percent impervious surface exceeds 20%, please provide calculations demonstrating total proposed
impervious level. The proposed project does not require stormwater planning.
XII. Sewage Disposal (required by DWQ)
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.
XIII. Violations (required by DWQ)
Is this site in violation of DWQ Wetland Rules (15A NCAC 2H.0500) or any Buffer Rules?
Yes ? No
Is this an after-the-fact permit application? Yes ? No
XIV. Cumulative Impacts (required by DWQ)
Will this project (based on past and reasonably anticipated future impacts) result in additional
development, which could impact nearby downstream water quality? Yes ? No
If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with
the most recent North Carolina Division of Water Quality policy posted on our website at
http://h2o.enr.state.nc.us/ncwetlands. If no, please provide a short narrative description: The
Updated 11/1/2005
Page 12 of 13
project is maintenance upgrades of an existing culvert to reduce flooding. The surrounding watershed is
almost entirely developed and the project should have no impact on future land use.
XV. Other Circumstances (Optional):
It is the applicant's responsibility to submit the application sufficiently in advance of desired
construction dates to allow processing time for these permits. However, an applicant may
choose to list constraints associated with construction or sequencing that may impose limits on
work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and
Threatened Species, accessibility problems, or other issues outside of the applicant's control).
None.
Applicant/AKt's Kignatul
(Agent's signature is valid only if an
Updated 11/1/2005
0?
le U3 Q////©W hat j
tion letter from the applicant is provided.)
Page 13 of 13
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 upgrade is part of a watershed wide plan for Simmons Branch to
reduce roadway and structure flooding in a predominantly residential neighborhood in
West Raleigh. Lail Court currently overtops during the 2-year 24-hour storm event based
on built out land use conditions. The proposed upgrade discussed in this PCN is designed
to convey the 10-year 24-hour storm based on future land use conditions as described in
the 2002 "Simmons Branch Drainage Study." The Lail Court culvert upgrade described
herein in addition to the proposed White Oak Lake improvements and other proposed
culvert improvements within the Simmons Branch watershed will substantially reduce the
flood risk throughout the area especially during more frequent storm events. Completion
of this project would affect areas under U.S. Army Corps of Engineers (USACE) jurisdiction,
specifically 2 linear feet of stream for culvert replacement and 30 LF of stream for a
temporary detour. These are unavoidable and required to provide channel stability and
hydraulic function.
Site Location and Description
Simmons Branch drains approximately 1.2 mi' 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
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°W.
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.
Proposed Culvert Improvements in the Simmon's Branch Drainage Basin Page 2
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 (5) 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).
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
Due to stream location, access considerations, and footprint requirements, limited 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.
The final site plan is the most practicable configuration in that it allows a usable yield of
land area while carefully configuring and placing infrastructure, utility lines, and roads to
minimize stream impact. Relocating the culvert would reduce stress on the upstream
channel bank, avoid sanitary sewer relocations, and preserve several large-sized trees on
the downstream end.
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 fill.
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 LF of fill for a temporary detour during construction and 15 LF
due to a utility relocation under Simmons Branch. Lail Court is a cul-de-sac and vehicular
Proposed Culvert Improvements in the Simmon's Branch Drainage Basin Page 3
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 will be developed and submitted for review and permitting by the
local jurisdiction. It will include appropriate erosion and siltation control devices placed
between the construction area and any affected waterway. These devices may include the
use of mulches, sediment basins, silt fences, or other devices capable of preventing erosion
and migration of sediments. 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 since the impacts are below
mitigation thresholds. O-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
will be replaced and the stream banks replanted with appropriate native species. The
culvert will cross the road at an angle between 75 and 105 degrees. No riparian buffer
mitigation is proposed.
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.
Proposed Culvert Improvements in the Simmon's Branch Drainage Basin Page 4
Table 1. Threatened and endangered species in oroiect 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.

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