20190119 Ver 1_SWMP 17BP.5.R.67_20190125

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STORMWATER MANAGEMENT PLAN �'�°u=%�
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP.5.R.67 TIP No.: SF-340080 County(ies): Franklin Page 1 of 1
General Project Information
WBS Element: 17BP.5.R.67 TIP Number: SF-340080 Project Type: Brid e Replacement Date: 1/8/2019
NCDOT Contact: Matthew Lauffer, PE Contractor / Desi ner: K le Stoffer, EI
Address: NCDOT Hydraulics Unit Address: HDR Engineering, Inc.
1590 Mail Services Unit 555 Fayetteville Street, Suite 900
Ralei h, NC 27560 Ralei h, NC 27601
Phone: [phone] Phone: [phone]
Email: mslauffer ncdot. ov Email: k le.stoffer hdrinc.com
Cit /Town: Bunn Count ies : Franklin
River Basin s: Neuse CAMA County? No
Wetlands within Project Limits? Yes
Pro'ect Description
Project Length (lin. miles or feet): 0.085 miles Surrounding Land Use: Low Residential, Wooded, Swamp
Proposed Pro'ect Existin Site
Pro'ect Built-Upon Area ac. 0.25 ac. 0.19 ac.
Typical Cross Section Description: Tant Road (SR 1737): 2 paved lanes (total 20' wide), 4' shoulder on each side, 7' with Tant Road (SR 1737): 2 paved lanes (total 18' wide)
guardrail.
Annual Avg Daily Traffic (veh/hr/day): Desi n/Future: 1100 Year: 2025 Existin : 615 Year: 2013
General Project Narrative: The North Carolina Department of Transportation (NCDOT) has proposed to replace Franklin County Bridge #80 on Tant Road (SR 1737) over Press Prong Tributary. The
(Description of Minimization of Water existing structure is a single span bridge (1@30'-9") and is prestressed concrete channels supported by RC caps on timber piles end bents. The proposed structure is a single
Quality Impacts) span (1@55'), 21" cored slab with 4' deep caps. This structure has been designed to have as little environmental, wetland, and surface water impacts as possible. 2:1 roadway
fill slope will be used in the wetland areas to minimize wetland impacts. Geotextile and Class II rip-rap was utilized for bank stabilization to reduce bank erosion along the north
and south channel underneath the bridge.
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 14+80 LT to dissipate energy to provide a diffuse flow (non-erosive
sheet flow) in a wooded wetland area. This diffuse flow will run for a distance of 15'+/- before entering the buffer. There is an existing ditch in the southeast quadrant of the
bridge. The ditch has outlet at 13+64 RT with a non-erosive velocity into the stream. This ditch will be retained. For the other three quadrants within the project limits, existing
roadway is in fill condition and there are no existing ditches. Toe protection was added to the proposed roadway fill toe that is adjacent to the wetland boundaries. 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.
Waterbod Information
Surface Water Bod 1: Press Pron Tributar NCDWR Stream Index No.: 27-86-3-3
NCDWR Surface Water Classification for Water Body Prima Classification: Class C
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: Neuse
Pro'ect Includes Brid e Spannin Water Bod ? Yes Deck Drains Dischar e Over Buffer? No Dissipator Pads Provided in Buffer? No
Deck Drains Dischar e Over Water Bod ? 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)