20190455 Ver 1_SMP_20190410

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Stormwater I�
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STORMWATER MANAGEMENT PLAN �"��%_�'
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP.2.R.86 TIP No.: County(ies): Beaufort Page 1 of 3
General Project Information
WBS Element: 17BP.2.R.86 TIP Number: Project Type: Brid e Replacement Date: 1/11/2019
NCDOT Contact: Robert T. Turnbull, Environmental Services, Inc. Contractor / Desi ner: HNTB North Carolina, P.C. / James A. B rd, PE
Address: 4901 Trademark Dr. Address: 343 E. Six Forks Road
Raleigh, NC 27610 Suite 200
Ralei h, NC 27609
Phone: [phone] Phone: [phone]
Email: rturnbull esinc.cc Email: 'ab rd hntb.com
Cit ITown: Pinetown Count ies : Beaufort
River Basin s: Tar-Pamlico CAMA Count ? Yes
Wetlands within Project Limits? Yes
Pro'ect Description
Pro'ect Len th lin. miles or feet : 0.284 mi. Surroundin Land Use: Rural Residential and Agriculture
Proposed Pro'ect Existin Site
Pro'ect Built-Upon Area ac. 1.9 ac. 0.7 ac.
Typical Cross Section Description: 2- 10' asphalt paved lanes with 2' paved shoulders, 4' grass shoulders. 2- 10' asphalt paved lanes with grass shoulders. Wetlands are present in the
northwest and southwest quadrants and will be impacted.
Annual Avg Daily Traffic (veh/hr/day): Desi n/Future: Year: Existin : Year:
General Project Narrative: State project 17BP.2.R.86 involves the replacement of Beaufort County Bridge #060159 on SR 1611 (Jones Bridge Rd.) over Pungo Creek. The existing bridge consists of 1@
(Description of Minimization of Water 25' - 6", 2@ 30' - 0", and 1@ 25' - 6" prestressed concrete channels, concrete caps, and timber piles. It is to be replaced with a 2@ 40' - 0", 1@ 45' - 0" 21" cored slab (125'
Quality Impacts) total length, 33' total width) at the same location.
The project includes 0.16 miles of roadway improvements on the north end of the bridge and 0.10 on the south end of the bridge. In accordance with Tar-Pamlico River Buffer
Regulations, the proposed bridge does not contain deck drains. Since the bridge is in normal crown, the stormwater from the bridge and approaches will be collected by two
storm drainage systems at -DRV3- station 11+00 Rt. and -L- 19+00 RT. The storm drainage system on -DRV3- will be discharged into Pungo Swamp, and the system on -L-
will discharge into a proposed ditch, which later discarges into Pungo Swamp. Class'I' rip rap pads are specified at the drainage outlets to lower discharge velocity and to
minimize impacts.
The roadside ditches in the northeast and northwest quadrant will be impacted by the proposed slope stakes. The ditch in the northwest quadrant will flow from north to south
and will outlet into Pungo Creek to match existing drainage patterns. The proposed ditch will be a special lateral V-ditch with 3:1 or flatter front slopes and 3:1 back slopes. The
ditch in the northeast quadrant will flow from south to north to match existing drainage patterns. The proposed ditch will be a special lateral V-ditch with 3:1 or flatter front slopes
and 3:1 back slopes.
Waterbody Information
Surface Water Body (1): Pungo Creek NCDWR Stream Index No.: 29-34-35-1
NCDWR Surface Water Classification for Water Body Primary Classification: Class C None
Supplemental Classification: Swamp Waters (Sw) (NSW)
Other Stream Classification:
Impairments: None
Aquatic T&E Species? No Comments:
NRTR Stream ID: Buffer Rules in Effect: Tar-Pamlico
Project Includes Bridge Spanning Water Body? Yes Deck Drains Discharge Over Buffer? No Dissipator Pads Provided in Buffer? No
Deck Drains Discharge 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)

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Hi hWa North Carolina Department of Transportation
�Stormwater Highway Stormwater Program �:
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STORMWATER MANAGEMENT PLAN ��"�`�
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP2.R.86 TIP No.: County ies : Beaufort Page 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 °/a cfs f s cfs f s Used Buffer Rules?
4 -L- Sta. 17+75 RT (1)Pungo 0.0 3.0 3.0 0.8 75 569 0.47°/ 2.0 1.1 2.3 1.1 No No
35.53617, -76.77409 Creek
Additional Comments

Hi hWa North Carolina Department of Transportation �°��"����`
�Stormwater � 7�
,,,,,,.,,,,, Highway Stormwater Program ���. �
STORMWATER MANAGEMENT PLAN \- "'='`'/
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: TIP No.: County(ies : Beaufort Page 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. Pro'ects Water Bod Type Riprap T pe ac Structure (in) (cfs) (fps) Buffer Rules?
4 -L- Sta. 17+77 LT (1)Pungo Riprap Energy Class I 0.7 Pipe 24 1.9 0.4 N/A
35.53615, -76.77429 Creek Dissipator Basin
4 -L-17+06 RT (1)Pungo Riprap Energy Classl 1.5 Pipe 24 3.0 0.4 N/A
35.53601, -76.77385 Creek Dissipator Basin
4 -L-17+75 RT (1)Pungo Riprap Energy Classl 0.8 Ditch - 2.3 0.4 N/A
35.53617, -76.77409 Creek Dissipator Basin
Additional Comments
' 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.