20171386 Ver 1_SW Diffuse Flow Plan_20171031

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„,,.,,,,,, Highway Stormwater Program � �
STORMWATER MANAGEMENT PLAN �=^%'
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP.2.R.80 TIP No.: County(ies): Lenoir Page 1 of 3
General Project Information
WBS Element: 17BP.2.R.80 TIP Number: Project Type: Bridge Replacement Date: 10/11/2017
NCDOT Contact: Robert T. Turnbull, Enviornmental Services, Inc. Contractor / Designer: HNTB North Carolina, P.C. / John F. Watson, 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: 'fwatson hntb.com
Cit ITown: Kinston Count ies : Lenoir
River Basin(s): Neuse CAMA County? No
Wetlands within Project Limits? Yes
Pro'ect Description
Project Length (lin. miles or feet): 0.09 Surrounding Land Use: Rural / Agricultural
Proposed Pro'ect Existin Site
Pro'ect Built-Upon Area ac. 0.7 ac. 0.7 ac.
Typical Cross Section Description: 2- 11' aphalt paved lanes with 2' to 5' paved shoulders, 3' grass shoulders. Ditches on 2- 10' asphalt paved lanes with grass shoulders. Wetlands are present in the
the west side of the roadway will be replaced with a'V' ditch on the south side of the northeast quadrant but not impacted.. Roadside ditches are present in all four
bridge and a 3' base ditch on the north side. quadrants and discharge directly into Joshua Creek.
Annual Avg Daily Traffic (veh/hr/day): Design/Future: 960 Year: 2032 Existing: 480 Year: 2012
General Project Narrative: State project 17BP.2.R.80 involves the replacemnt of Bridge #530143 on SR 1922 (Vine Swamp Rd) over Joshua Creek in Lenoir County. The existing bridge #530143 consists
(Description of Minimization of Water of 1@ 15'-6", 1@ 15'-3", 1@ 15'-9" reinforced concrete floor on timberjoists, caps, and piles. It is to be replaced with a 1@ 60'-0", 21" cored slab (33' total width) at the same
Quality Impacts) location. The project also includes 0.03 mi of roadway improvements to the northeast and 0.04 mi of roadway improvemnts to the southwest.
The proposed bridge does not contain deck drains. Storm water from the bridge and approach slabs will be collected by a storm drainage system and discharged into a Rip-Rap
Pad at -L- 23+g6 RT, outside of the buffers. Storm water will discharge into the existing drainage ditch in the northeast quadrant, where it will follow existing drainage patterns.
The roadside ditches in the northwest and southwest quadrants will be impacted. The redesigned ditches will tie into Joshua Creek to match the existing drainage patterns, with
3:1 front and back slopes. Rip Rap at embankment is proposed on the southwest ditch to prevent head cutting while minimizing depth. The northwest ditch ties to the toe of
bank, again to match existing drainage patterns The roadside ditches in the northeast and southeast quandrants will not be impacted, so the existing drainage patterns will be
retained.
Waterbody Information
Surface Water Body (1): Joshua Creek NCDWR Stream Index No.: 27-101-4
NCDWR Surface Water Classification for Water Body Primary Classification: Class C
Supplemental Classification: Swamp Waters (Sw) (NSW)
Other Stream Classification:
Impairments:
Aquatic T&E Species? Comments:
NRTR Stream ID: Buffer Rules in Effect: Neuse
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 MANAGEMENT PLAN ���"�"��
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP2.R.80 TIP No.: Count ies : Lenoir 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 (fps) (cfs f s Used Buffer Rules?
4 -L- 22+75 LT (1)Joshua 0.0 3.0 3.0 6.0 600 1800 2.71 °/ 8.0 3.1 11.0 3.4 No No
35.125911 / -77.583637 Creek
4 -L- 22+gg LT (1)Joshua 0.0 3.0 3.0 6.0 600 1800 0.50°/ 8.0 1.7 11.0 1.8 No No
35.125964 / -77.583596 Creek
4 -L- 23+10 LT (1)Joshua 3.0 3.0 3.0 133.0 13300 3800 0.30°/ 17.0 1.6 29.0 1.9 No No
35.125991 / -77.583565 Creek
Additional Comments

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STORMWATER MANAGEMENT PLAN ��"='�'"%
(Version 2.07; Released October 2076) FOR NCDOT PROJECTS
WBS Element: TIP No.: County(ies): Lenoir 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- 23+g6 RT (1)Joshua Riprap Energy Class I 0.1 Pipe 18 0.2 0.6 N/A
35.126049 / -77.583233 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.