20171595 Ver 1_SW Diffuse Flow Plan_20171214

1 II};Il�Vc1V 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.77 TIP No.: County(ies): Jones Page 1 of 3
General Project Information
WBS Element: 178P2.R.77 TIP Number: Project Type: Brid e Replacement Date: 10/5/2017
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: Comfort County ies): Jones
River Basin s: Neuse CAMA Count ? No
Wetlands within Project Limits? Yes
Pro'ect Description
Pro'ect Len th lin. miles or feet : 0.14 Surrounding Land Use: Rural / Agricultural
Proposed Pro'ect Existin Site
Pro"ect Built-Upon Area ac. 1.2 ac. 0.9 ac.
Typical Cross Section Description: 2- 11' asphalt paved lanes with 2' to 5' paved shoulders, 3' grass shoulders. Ditches in 2- 10' asphalt paved lanes with grass shoulders. Wetlands are present in all four
all four quadrants will be impacted. quadrants but not impacted. Roadside ditches are present in all four quadrants with
one being jurisdictional and tying directly into Tuckahoe Creek. Two others outlet into
the wetlands, and the fourth flows away from the stream.
Annual Avg Daily Traffic (vehlhr/day): Desi n/Future: 820 Year: 2032 Existi� : 410 Year: 2012
General Project Narrative: State project 178P.2.R.77 involves the replacement of Bridge #510032 on SR 1142 (Weyerhaeuser Rd.) over Tuckahoe Creek in Jones County. The existing bridge #510032
(Description of Minimization of Water consists of 1@ 17'-7", 1@ 17'-4", 1@ 17'-0", 1@ 17'-5", 1@ 16'-11 ", 1@ 16'-10", 1@ 16'-7", 1@ 17'-6", and 1@ 17'-8" timber floor on continuous I-beams, timber caps,
Quality Impacts) and timber piles. It is to be replaced with a 1@ 40'-0", 1@ 70'-0", 1@ 60'-0" 24" Cored Slab units with a 3.75" asphalt wearing surtace at the same location. The overall bridge
length will be 170.0' and a width of 33.0'. The project also includes 0.05 mi of roadway improvements to the south and 0.06 mi of roadway improvements to the north.
The proposed bridge does not contain deck drains. Storm water will discharge into the proposed drainage ditches in the northeast, northwest, southeast, and southwest
quadrants, where it will follow existing drainage patterns.
The roadside ditches in the northeast, northwest, southeast, and southwest quadrants will be impacted. The redesigned ditches, with the exception of the ditch in the northeast
quadrant, will tie into Tuckahoe Creek, and match the existing drainage patterns. The proposed ditch in the southwest quadrant will begin as a V-ditch with 3:1 slopes, and
transition into a 4' special lateral base ditch with 2:1 slopes and Class I Rip Rap lining. The Rip Rap is proposed on the southwest ditch to stabilize the side slopes. The
northwest and southeast ditches will be special lateral V-ditches with 3:1 slopes and will tie into the existing wetlands. The southeast ditch will be lined with Class I Rip Rap at
the end to minimize velocity and prevent erosion. The northeast ditch will be a special lateral V-ditch with a 4:1 front slope and 3:1 back slope. The northeast ditch will flow north,
away from the project.
Waterbody Information
Surface Water Body (1): Tuckahoe Creek NCDWR Stream Index No.: 27-101-5
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)

, North Carolina De artment of Trans ortation �
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,,.,, � Highway Stormwater Program �E�
STORMWATER MANAGEMENT PLAN -
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: 17BP.2.R.77 TIP No.: County(ies): Jones 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 Siope Q2 V2 Q10 V10 Checks Associated w/
No. Pro�ects Bod ft H:1 H:1 ac ft ft % cfs (f s cfs f s Used Buffer Rules?
4 -L- 15+50 LT (1)Tuckahoe 0.0 3.0 3.0 10.2 1020 2000 3.00°/ 8.6 3.3 11.8 3.6 No No
35.031671 / -77.579449 Creek
4 -L- 16+40 LT (1)Tuckahoe 4.0 2.0 2.0 10.2 1020 100 2.50°/ 8.6 3.0 11.8 3.3 No No
35.031892 / -77.579508 Creek
4 -L- 16+50 RT (1)Tuckahoe 0.0 3.0 3.0 8.7 870 2100 5.00% 7.5 2.6 10.3 2.8 Yes No
35.031981 / -77.579284 Creek
4 -L- 18+05 LT (1)Tuckahoe 0.0 3.0 3.0 6.3 630 150 0.50°/ 3.4 1.3 4.7 1.5 No No
35.032324 / -77.579676 Creek
4 -L-22+SORT (1)Tuckahoe 0.0 4.0 3.0 0.5 50 250 0.20% 0.6 0.6 0.9 0.7 No No
35.033559 / -77.579800 Creek
Additional Comments

11i�;11�v�1y North Carolina Department of Transportation '
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,.�...,_„ Highway Stormwater Program � ,�� L '
STORMWATER MANAGEMENT PLAN —
(Version 2.07; Released October 2016) FOR NCDOT PROJECTS
WBS Element: TIP No.: Count ies : Jones Pa e 3 of 3
Preformed Scour Holes and Energy Dissipators
Station 8 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- 16+21.26 RT (1)Tuckahoe Riprap Energy Class I 0.2 Pipe 15 0.5 2.6 N/A
35.031900 / -77.579271 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.