20180326 Ver 1_17BP 5 R 69 SWMP_20180307

Highw�y North Carolina Department of Transportation ��'
Stormwaier i,�+ `I
,,.,,,.�,,,� Highway Stormwater Program s.J�_�
STORMWATER MANAGEMENT PLAN ---
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 176P.5.R.69 TIP No.: SF-340020 County(ies): Franklin Page 1 of 1
General Project Information
WBS Element: 17BP.5.R.69 TIP Number: SF-340020 Pro'ect Type: Bridge Re lacement Date: 2/21/2018
NCDOT Contact: Matthew Lauffer, PE Contractor / Designer: David Fuh, PE
Address: NCDOT Hydraulics Unit Address: HDR Engineering, Inc.
1590 Mail Services Unit 5155 Fayetteville Street, Suite 900
Ralei h, NC 27560 Ralei h, NC 27601
Phone: [phone] Phone: [phone]
Email: mslauffer ncdot. ov Email: david.fuh hdrinc.com
Cit /Town: Louisbur Count ies : Franklin
River Basin s: Tar-Pamlico CAMA Count ? No
Wetlands within Project Limits? Yes
Pro'ect Description
Project Length (lin. miles or feet): 0.133 miles Surrounding Land Use: Low Residential, Wooded
Proposed Pro'ect Existin Site
Pro'ect Built-Upon Area ac. 0.45 ac. 0.30 ac.
Typical Cross Section Description: Peach Orchard Road (SR 1114): 2 paved lanes (total 22' wide), 6' shoulder on each side Peach Orchard Road (SR 1114): 2 paved lanes (total 18' wide)
(9' with guardrail).
Annual Avg Daily Traffic (veh/hr/day): Desi n/Future: 2200 Year: 2025 Existin : 1610 Year: 2012
General Project Narrative: The North Carolina Department of Transportation (NCDOT) has proposed to replace Franklin County Bridge #20 on Peach Orchard Road (SR 1114) over Cedar Creek. The
(Description of Minimization of Water existing structure is a four span bridge (4@40') and is a reinforced concrete floor on I-beams with RC caps and timber pile end bents and 4 steel crutch interior bents. The
Quality Impacts) proposed structure is a two span (1 @90', 1@85'), 33" box beam with 4' deep caps. This structure has been designed to have as little environmental, wetland, and surface water
impacts as possible. Geotextile and rip-rap was utilized for bank stabilization in an attempt to reduce stream bank erosion along the south bank of the channel and the north
bank of the open water underneath the existing bridge. 2:1 roadway fill slope will be used in the wetland areas to minimize wetland impacts. Permanent drainage easement
(PDE) will be set to have as little wetland impacts as possible. To avoid direct discharge of bridge storm water into the receiving water, deck drains are not required for the
proposed bridge. Storm water impacts to the stream have been minimized by utilizing grated inlets and pipes to collect bridge storm water and use rip rap outlet protection at
13+06 RT to dissipate energy to provide a diffuse flow (non-erosive sheet flow) in a wooded area. This diffuse flow will run for a distance of 70'+/- before entering the buffer. At
the same (SE) quadrant, an existing roadside ditch has outlet at 11+64 RT and water exits the ditch with a non-erosive outlet velocity. This diffuse flow runs for a distance of
170'+/- before entering the buffer. At the NE quadrant a proposed roadway typical cut ditch with a 3:1 side slope outlets to a special cut ditch with Class B Rip Rap. The outfall
area at 15+84 RT is stable with a non-erosive outlet velocity. There are no existing or proposed ditches in the SW quadrant. In the NW quadrant, an existing roadside ditch has
outlet at 17+45 LT with a non-erosive velocity. Both the outfall and existing ditch are in stable condition. Due to the nature of low impact bridge replacement, the increases in
stormwater discharges (post vs pre condition) are insignificant and the existing ditches do not need to be modified. Therefore, additional stormwater measures are not required.
A causeway will be utilized over Cedar Creek to remove two interior bents and a second causeway will be utilized over the open water to remove the other five interior bents.
Waterbod Information
Surface Water Body (1 : Cedar Creek NCDWR Stream Index No.: 28-29- 2
NCDWR Surface Water Classification for Water Body Primary Classification: Water Su pl IV WS-IV
Supplemental Classification: Nutrient Sensitive Waters NSW
Other Stream Classification: None
Impairments: None
A uatic T&E S ecies? No Comments:
NRTR Stream ID: Buffer Rules in Effect: Tar-Pamlico
Project Includes Brid e Spanning Water Body? Yes Deck Drains Discharge Over Buffer? No Dissipator Pads Provided in Buffer? No
Deck Drains Dischar e Over Water Body? No (If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the
(If yes, provide justification in the General Project Narrative) General Project Narrative)