20170407 Ver 1_SMP revised_20170524

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STORMWATER MANAGEMENT PLAN _ _
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP.2.R.76 TIP No.: County(ies): Beaufort Page 1 of 3
General Project Information
WBS Element: 17BP.2.R.76 TIP Number: Pro'ect T e: Brid e Re lacement Date: 5/18/2017
NCDOT Contact: Ja B. Johnson - Division Environmental Officer Contractor / Desi ner: HNTB North Carolina, P.C. / James A. B rd, PE
Address: 105 Pactolus Hwy. (NC 33) Address: 343 E. Six Forks Road
PO Box 1587 Suite 200
Greenville, NC 27835 Ralei h, NC 27609
Phone: [phone] Phone: [phone]
Email: 'b'ohnson ncdot. ov Email: 'ab rd hntb.com
Cit /Town: Washin ton Count ies : Beaufort
River Basin s: Tar-Pamlico CAMA Count . Yes
Wetlands within Project Limits? Yes
Pro'ect Descri tion
Pro'ect Len th lin. miles or feet : 0.15 Surroundin Land Use: Rural Residental and Agriculture
Pro osed Pro'ect Existin Site
Pro'ect Built-U on Area ac. 0.5 ac. 0.4 ac.
Typical Cross Section Description: 2- 11' asphalt paved lanes with 2' paved shoulders, 4' grass shoulders. Impacted ditch in 2- 11' asphalt paved lanes with grass shoulders, 2:1 of flater grass lined ditches in
northwest quadrant is replaced with 3:1 front and back slopes which transition to a northeast and northwest quadrants. Wetlands are present in southeast and southwest
variable width base ditch to replicate existing drainage patterns. quadrants.
Annual Avg Daily Traffic (veh/hr/day): Desi n/Future: 2200 Year: 2032 Existin : 1100 Year: 2012
General Project Narrative: State project 17BP.2.R.76 involves the replacement of Beaufort County Bridge #060004 on SR 1410 (VOA Rd.) over Aggie Run. The existing bridge consists of 1@ 17' - 10", 4
(Description of Minimization of Water @ 17' - 0" and 1@ 17' - 7", reinforced concrete deck on timber joists. It is to be replaced with a 1@ 50' - 0", 1@ 50' - 0" and 1@ 35' - 0", 21" cored slab (135' total length, 33'
Quality Impacts) totoal width) at the same location.
In accorance with Tar-Pamlico River Buffer Regulations, the propsoed bridge does not contain deck drains. All stormwater from the bridge and approches will be collected
by a storm drainage system and discharged into the wetlands. The drainage system will outlet outside of the buffer limits in the southwest quadrant at -L- station 13+g6 LT with
the outlet pipe set at 0.3% to reduce velocity into the wetlands.
At northeast quadrant the fill slope was revised to steeper than 3:1 slope to eliminate fill in the existing ditch. The proposed ditch in the northwest quadrant maintains exist
drainage pattern by utilizing variable width base ditch that tappers to 0' in depth and matches the width of existing drainage feature prior to reaching Aggie Run.
Waterbody Information
Surface Water Body (1): Aggie Run NCDWR Stream Index No.: 28-103-14
NCDWR Surtace Water Classification for Water Body Primary Classification: Class C
Supplemental Classification: Swamp Waters (Sw) (NSV�
Other Stream Classification:
Impairments:
Aquatic T&E Species? Comments:
NRTR Stream ID: Buffer Rules in Effect: Tar-Pamlico
Project Includes Bridge Spanning Water Bod�/? Yes Deck Drains Discharge Over Buffer? No Dissipator Pads Provided in Buffer? N/A
Deck Drains Discharge 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)

Hl� hWa North Carolina Department of Transportation %
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,,,,,,,,,,,, Highway Stormwater Program `;;,,
STORMWATER MANAGEMENT PLAN ��';-"'==�'�
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP.2.R.76 TIP No.: Count ies : Beaufort Pa e 2 of 3
Swales
Station & Coordinates Surface Base Front Back Drainage Recommended Actual Longitudinal Rock BMP
Sheet (Road and Non Road Water Width Slope Slope Area Treatm't Length Length Slope Q2 V2 Q10 V10 Checks Associated w/
No. Pro'ects Bod it H:1 H:1 ac ft ft % cfs f s cfs f s Used Buffer Rules?
4 16+00 LT (1)Aggie Run 0.0 3.0 3.0 1.1 110 360 4.43% 1.6 2.5 2.1 2.7 No No
35.610606 / -77.132618
4 15+50 LT (1)Aggie Run 2.0 3.0 3.0 1.1 110 410 8.82% 1.6 2.3 2.1 2.5 No No
35.610635 / -77.132613
Additional Comments

HI�hWdy North Carolina Department of Transportation ����
Stormwater
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,,,,,,.,,,., Highway Stormwater Program �;�°')
STORMWATER MANAGEMENT PLAN �� "="'�'�/
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: TIP No.: Count ies : Beaufort Pa e 3 of 3
Preformed Scour Holes and Energy Dissipators
Station & Coordinates Drainage Pipe/Structure BMP
Sheet (Road and Non Road Surface Energy Dissipator Area Conveyance Dimensions Q10 V10 Associated w/
No. Projects) Water Body Type Riprap Type (ac) Structure (in) (cfs) (fps) Buffer Rules?
4 13+96 LT (1)Aggie Run Riprap Pad Class'B' 0.1 Pipe 15 0.5 0.4 Yes
35.610588 / -77.132616
Additional Comments
Aggie Run is within the Tar-Pamlico River Basin.
* Refer to the NCDOT Best Management Practices Toolbox (2014), NCDOT Standards, the Federal Highway Administration (FHWA) Hydraulic Engineering Circular No. 14 (HEC-14), Third Edition, Hydraulic Design of Energy
Dissipators for Culverts and Channels (July 2006), as applicable, for design guidance and criteria.