20140277 Ver 2_02_U-4726DD_NWP_Cover_NCDWR 170804_20170807

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Axiom Environmenlal, Ync.
August 4, 2017
Ms. April Norton
N.C. Division of Water Resources
1617 Mail Service Center
Raleigh, NC 27699-1617
Axiom Environmental, Inc.
218 Snow Avenue, Raleigh, North Caroliyia 27603 919-696-3045
RE: Application for Section 404 Nationwide Permit 14 and Section 401 Water Quality
Certification 4088 for TIP Project# U-4726DD, Rogers Road Sidewalk Project, SR 1729
(Rogers Road) Sidewalk from SR 1172 (Homestead Road) to Meadow Run Court,
Carrboro, Orange County, NC, Federal Aid Project No. STPDA-0702(22).
NCDWR Project No. 20140277
Dear April,
The Town of Carrboro, Public Works Department proposes to construct a 5-foot wide concrete
sidewalk along SR 1729 (Rogers Road) in the Town of Carrboro from SR 1777 (Homestead Road)
to Meadow Run CoLtrt (Figure 1). Information within this package has been prepared to support
the application for authorization of impacts by Nationwide Permit (NWP) 14 (Linear
Transportation Projects), along with the associated N.C. Division of Water Resources (NCDWR)
Water Quality General Certification 4088 and a Riparian Buffer Authorization.
Approval for the proposed project was iiutially requested under a NWP 14 and tbe associated
Water Quality Certification (WQC) 3886 on March 20, 2014. An approved NWP 14 was received
on April 15, 2014 from David Bailey of the US Army Corps of Engineers (USACE), and an
approved WQC was received from Dave Wanucha (for Tom Reeder) on April 24, 2014. The
approved NWP 14 and WQC 3886 expired on March 18, 2017 with the issuance of the updated
2017 NWPs. An approved Jurisdictional Deter�nination was requested at the time of permit
application and was also approved on April 15, 2014. This JD has an expiration date of April 15,
2019. The approved WQC, dated April 24, 2014, is attached.
Subsequent to tl�e receipt of the approved NWP 14, no revisions have been applied to the proposed
project plans that affect jurisdictional streams or wetlands. Addition of rip rap protection to the
toe of the proposed fill slope was determined to be necessary at Site 2(Riparian Buffer Permit
drawings, sheet 4). This toe-of-slope protection has been added entirely within the previously
proposed cut-fill footprint, and does not affect the area of impacts to protected riparian buffers.

Ms. April Norton Axiom Environmental, Inc.
August 3, 2017 page 2
Project Purpose and Need
The purpose of this project is to provide an alternate mode of transportation (pedestrian). The
project will provide a pedestrian circulation network to improve mobility and expand access to
downtown Carrboro, schools, parks, bus stops, businesses, residential areas, Town buildings, and
other facilities. This project is a part of the Town of Carrboro's sidewalk construction plan that
was approved in November 2003.
Project Description
A 5-foot wide concrete sidewalk, to be used as a pedestrian path, will be constructed along SR
1729 (Rogers Road) in the Town of Carrboro from SR 1777 (Homestead Road) to Meadow Run
Court (Figure 1). The length of the project will be approximately 5700 feet. The project will
provide sidewalk connectivity along Rogers Road to Homestead Road and Meadow Run Court.
The study area associated with this project encompasses approximately 3.3 acres.
Water resources in the project area are located within U.S. Geological Survey (USGS) Hydrologic
Unit (HLJ) 03030002 (NCDWQ sub-basin 03-06-06 of the Cape Fear River basin). Jurisdictional
surface waters, wetlands, and riparian buffers are anticipated to be impacted by project activities.
Surface waters impacted by the U-4726DD project drain to Bolin Creek. Bolin Creek is listed by
the NCDWR as a Watershed-V (WS-V) Water with the supplemental Nutrient Sensitive Waters
(NSW) classification. No surface waters within the study area are listed as impaired by the final
2014 Category 5 Water Quality Assessments-303(d) List. A Stormwater Management Plan is
included in this package.
Attached to this letter are the following items.
• A Pre-Construction Notification (PCN) Form
• Figure 1. U-4726DD Project Location Map
• U-4726DD Stormwater Management Plan, Wetland and Surface Water Impacts Permit
Drawings, and summary sheet dated August 2, 2017
• U-4726DD Buffer Permit Impacts Permit Drawings and summary sheet dated August 2, 2017
• U-4726DD Design Plans dated May 17, 2017
• U-4726DD Categorical Exclusion Action Classification Form dated September 19, 2014 and
2017 T&E species update memo dated August 3, 2017
• The previously approved NWP14 for this project, dated April 15, 2014 and the previously
approved General Water Quality Certification 3886 for this project dated Apri124, 2014.
• A signed Agent Authorization form
• A check for the minor water quality application fee of $240

Ms. April Norton Axio�n Eiivironmental, Inc.
August 3, 2017 page 3
Based upon Preliminary Design Plans, consti-uction of the Rogers Road sidewalk is anticipated to
permanently iinpact a total of 17.3 linear feet of stream and less than 0.01 acre of jurisdictional
wetland in each of two locations. Table 1 and the attached Wetland Permit Impact Suminary
summarize the total impacts to surface waters and jurisdictional wetland areas. Table 2 and the
attached Buffer Impacts Suinmary swnmarize the total iinpacts to riparian buffer areas. Irnpact
sites are described below and depicted on the attached permit drawings. Table 3 lists the
geographic coordinates of the project impact sites.
Table 1. Project Impacts to Surface Waters and Wetlands
Perinanent Teinporary Total Permanent Temporary Total
Stream Stream Stream Wetland Wetland Wetland
Impacted Impacts Impacts Impacts Impacts Impacts Impacts
Site Waterbod (feet (feet) (feet (acres acres (acres)
1 UT to Bolin Creek 9 � 3 22 >0.01 -- >0.01
(Streain S1)
2 UT to Bolin Creek 9 l l 20 >0.01 -- >0.01
(Stream S2
Total 18 24 42 >0.01 -- 0.02
Table 2. Project Impacts to Riparian Buffer Areas
Buffer Im acts (s uare feet
Iinpact Buffered Allowable
Site Waterbod Zone 1 Zone 2 Total
1 UT to Bolin Creel< (Stream S1) 1270 811 2081
2 UT to Bolin Creek (Stream S2) 977 567 1544
Total 2247 1378 3625
Table 3. Project Impact Locations
NC State Plane, feet (NAD 83) WGS 84, decimal degrees
Im act Site EastinQ Northin Latitude Lon itude
1 1,974,581.661 804,503.282 35.960425 -79.085888
2 1,976,170.313 801,251.598 35.951496 -79.080512
Impact Site 1
Impact Site 1 involves the extension of the culvert conveying an uni�amed tributary (UT) to Bolin
Creek under Rogers Road in order to construct a 5-foot wide, concrete sidewalk along the west
side of the roadway. The existing 48-inch con�,igated metal pipe (CMP) will be extended by 9 feet
with a 48-ulch corrugated steel pipe (CSP) extension that incorporates a gasket sleeve connection

Ms. April Norton Axiom Environmental, Inc.
August 3, 2017 page 4
and an endwall. Temporary impacts due to stream dewatering during construction total 13 feet.
Grading of the roadway slope to widen the roadside area appropriately for the five-foot sidewalk
is anticipated to permanently impact less than 0.01 acre of jurisdictional wetland (Wetland W1),
and mechanized clearing for grading preparation will also impact less than 0.01 acre of Wetland
W 1. Due to the minimal width of the proposed fill slope, total permanent impacts to Wetland W 1
are less than 0.01 acre. This wetland area is a North Carolina Wetland Assessment Method (NC
WAM) Headwater Forest wetland with an overall functional rating of Low.
Construction at this site will result in impacts to 1270 square feet of Zone 1 buffer and 811 square
feet of Zone 2 buffer for a total of 2081 square feet of impacts to the riparian buffer. Included
within this impact area is a drainage feature that discharges stormwater directly into the riparian
buffer. Multiple stormwater discharge options at this site were evaluated in an attempt to avoid
buffer impacts, including the location of a drainage structure in a sag over the existing 48" CMP
and utilizing the existing outlet, relocating the 2-grated inlet (2-GI) and outlet outside the buffer,
and trying to route the drainage pipe from the proposed 2-GI through a Junction Box to an outlet
outside the buffer limits. The proposed 2-GI location was the only option deemed feasible with the
project elevation constraints. In order to minimize impacts to the riparian buffer and associated
surface water, stormwater treatment has been maximized prior to entering the buffer. The
proposed location of the 2-GI provides stormwater treatment with approximately 220 linear feet
of proposed grass swales to treat stormwater generated within the 0.19 acre drainage area of the 2-
GI. The necessary length of grass swales for a drainage area of this size is 19 linear feet (100
linear feet per acre) for effective treatment. The discharge velocity at the end of the rip rap
dissipator is calculated at 0.8 feet per second for a 10 year storm event. Impacts to riparian buffers
as a result of road crossings are listed as "Allowable."
Impact Site 2
Impact Site 2 involves the extension of the culvert conveying an unnamed tributary (UT) to Bolin
Creek under Rogers Road in order to construct a 5-foot wide, concrete sidewalk along the west
side of the roadway. The existing 48-inch CMP will be extended by 9 feet with two 54-inch CSP
extensions that incorporates gasket sleeve connections and endwalls. Temporary impacts due to
stream dewatering during construction total 11 feet. Grading of the roadway slope to widen the
roadside area appropriately for the five-foot sidewalk is anticipated to permanently impact less
than 0.01 acre of jurisdictional wetland (Wetland W 1), and mechanized clearing for grading
preparation will also impact less than 0.01 acre of Wetland W 1. Due to the minimal width of the
proposed fill slope, total permanent impacts to Wetland W 1 are less than 0.01 acre. This wetland
area is a North Carolina Wetland Assessment Method (NC WAM) Headwater Forest wetland with
an overall functional rating of Low.

Ms. April Norton Axiom Environmental, Inc.
August 3, 2017 page 5
Construction at this site will result in impacts to 977 square feet of Zone 1 buffer and 567 square
feet of Zone 2 buffer for a total of 1544 square feet of impacts to the riparian buffer. Impacts to
riparian buffers as a result of road crossings are listed as "Allowable."
Since project impacts do not exceed mitigation thresholds for the requested permits, no mitigation
is proposed for this project.
Again, the Town of Carrboro is requesting authorization for Section 404 jurisdictional area impacts
associated with the construction of a sidewalk adjacent to Rogers Road under NWP 14 (Linear
Transportation Projects), along with the associated NCDWR Water Quality General Certification
Number 4088 and Buffer Authorization. Thank you for your time and consideration of this
important project. If you have any questions regarding this request, please contact Scott Davis
(Axiom Environmental, Inc.) at 919-270-9316, or [e-mail]; Josh Dalton
(Sungate Design Group) at [phone] ext. 201, or [e-mail]; or the Town
of Carrboro point-of-contact, Nate Broman-Fulks, at 919-918-7427, or nbroman-
fulks @townofcarrboro. org.
Sincerely,
Scott G. Davis
Axiom Environmental, Inc.
Cc. Samantha Dailey, US Army Corps of Engineers
Nate Broman-Fulks, Town of Carrboro
Josh Dalton, Sungate Design Group