20180542 Ver 1_17BP 2 R 85_BP249_SMP_20180417

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„,,.,,,,,, Highway Stormwater Program � �
STORMWATER MANAGEMENT PLAN ����<`�^—=%'
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP.2.R.85 TIP No.: County(ies): Beaufort Page 1 of 2
General Project Information
WBS Element: 17BP.2.R.85 TIP Number: Project Type: Bridge Replacement Date: 11/30/2017
NCDOT Contact: Robert T. Turnbull, Environmental Services, Inc. Contractor / Designer: HNTB North Carolina, P.C. / James A. Byrd, 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: Bath Count ies : Beaufort
River Basin(s): Tar-Pamlico CAMA County? Yes
Wetlands within Project Limits? Yes
Pro'ect Description
Project Length (lin. miles or feet): 0.13 Surrounding Land Use: Rural Residential and Agriculture
Proposed Pro'ect Existin Site
Pro'ect Built-Upon Area ac. 1.2 ac. 0.5 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 all four
quadrants. CAMA wetlands are distinguished from 404 wetlands.
Annual Avg Daily Traffic (veh/hr/day): Design/Future: 530 Year: 2011 Existing: 1060 Year: 2031
General Project Narrative: State project 17BP.2.R.85 involves the replacement of Beaufort County Bridge #060249 on SR 1336 (Hawkins Beach Rd.) over Duck Creek. The existing bridge consists
(Description of Minimization of Water of 1@ 17' - 10", 1@ 17' - 1", and 1@ 17' - 9" timber deck on timber joists, steel caps, and timber piles. It is to be replaced with a 1@ 30' - 0" and 1@ 55' - 0" 21" cored slab
Quality Impacts) (85' total length, 33' total width) at the same location. To facilitate the construction of the proposed bridge, an onsite detour is proposed on the downstream side of SR 1336.
The project includes 0.110 miles of roadway improvements. In accordance with Tar-Pamlico River Buffer Regulations, the proposed bridge does not contain deck drains. All
stormwater from the bridge and approaches 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 northeastern quadrant at -L- station 16+18 LT, with the outlet pipe set at 0.1% to reduce velocity into the wetlands. A Class 'B' rip rap pad was specified at the
drainage outlet to lower discharge velocity and to minimize impacts. No defined roadside ditches exist that are impacted by the proposed slope stakes. Thus, all existing
drainage patterns are maintained in the proposed design.
Waterbody Information
Surface Water Body (1): Duck Creek NCDWR Stream Index No.: 29-16-(2)
NCDWR Surface Water Classification for Water Body Primary Classification: Class SC
Supplemental Classification: Nutrient Sensitive Waters (NSW)
Other Stream Classification:
Impairments:
Aquatic T&E Species? 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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�Stormwater � �
,,,�,,,..., Highway Stormwater Program �`�
STORMWATER MANAGEMENT PLAN ��"='�'"�
(Version 2.07; Released October 2076) FOR NCDOT PROJECTS
WBS Element: 17BP2.R.85 TIP No.: Count ies : Beaufort Pa e 2 of 2
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. 16+18 LT (1)Duck Riprap Energy Class'B' 0.1 Pipe 15 0.8 1.6 Yes
35.462992 / -76.854354 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.