20210452 Ver 1_R-2577A_HYD_SMPv2.08_(20210308) (Apr 2018)_20210309

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North Carolina Department of Transportation
Highway Stormwater Program mo
STORMWATER MANAGEMENT PLAN Ac
(Version 2.08;Released April 2018) FOR NCDOT PROJECTS
WBS Element: 37405.1.2 TIP No.: R-2577A County(ies): Forsyth Page 1 of 3
General Project Information gWBS Element: 37405.1.2 ITIP Number: R-2577A Project Type: Roadway Widening Date: 3/8/2021
NCDOT Contact: Erik Seiler,PE Contractor/Designer: RK&K:Brent Huskey,PE
Address: NC Department of Transportation Address: 900 Ridgefield Drive
1000 Birch Ridge Drive Suite 350
Raleigh,NC 27610 Raleigh,NC 27609
Phone: [phone] Phone: [phone]
Email:[e-mail] Email: [e-mail]
City/Town: Walkertown County(ies): Forsyth
River Basin(s): Yadkin-Pee Dee Roanoke CAMA County? No
Wetlands within Project Limits? Yes I
Project Description —mi _
Project Length(lin.miles or feet): 5.76 Surrounding Land Use: Commercial/Residential
Proposed Project INIMIllxistirlig Site
Project Built-Upon Area(ac.) 66.6 ac. 34.8 ac.
Typical Cross Section Description: The proposed typical cross section of US 158 will be a four lane divided highway with(2)-The existing typical cross section for US 158 is a two lane highway with 12'lanes and
12'lanes each direction and 2'-6"curb and gutter on the outside lanes. For the majority 2'open shoulders.
of the roadway facility it will have a raised grass median with 1'-6"curb and gutter,
protected turn lanes and turn bulbs.
Annual Avg Daily Traffic(veh/hr/day): Design/Future: 35,000 Year:2040 Existing: 23,600 Year: 2017
General Project Narrative: The widening of US 158 between Old Greensboro Rd and Belews Creek Rd will involve alignment improvement,adding lanes,drainage improvements,new structures such as
(Description of Minimization of Water dual bridges and culvert extensions. The project also includes signal improvements and utility relocations. There are three major crossings on the project providing adequate
Quality Impacts) cross sectional openings to allow water to travel under US 158 without impacting any structures adjacent to the project. The three major crossings consist of a set of dual
bridges and two RCBC extensions. Drainage outfalls along the project have been analyzed to verify stability as well as outlet protection has been incorporated into the design
for all proposed drainage improvements. Areas of the project around jurisdictional features have incorporated steeper side slopes of 2:1 to minimize impacts. The first 75
percent of the project is located in the Yadkin Pee-Dee river basin and the remaining 25 percent of the project as you travel though the NC-66 intersection transitions to the
Roanoke river basin. Neither river basin adheres to buffer requirements.
Waterbody Information =
Surface Water Body(1): Lowery Mill Creek NCDWR Stream Index No.: 19-94-12-3-(0.5)
NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply Ill(WS-III)
Supplemental Classification: None
Other Stream Classification: None
Impairments: None
Aquatic T&E Species? No Comments:
NRTR Stream ID: SEW Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body? Yes Deck Drains Discharge Over Buffer? N/A Dissipator Pads Provided in Buffer? N/A
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)

Highway North Carolina Department of Transportation %
—Stor er
Y ,,, Highway Stormwater Program
STORMWATER MANAGEMENT PLAN
(Version 2.08;Released April 2018) FOR NCDOT PROJECTS
WBS Element: 37405.1.2 TIP No.: R-2577A County(ies): Forsyth Page 2 of 3
Additional Waterbody Information
Surface Water Body(2): Martin Mill Creek NCDWR Stream Index No.: 12-94-12-3-1
NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply III(WS-III)
Supplemental Classification: None
Other Stream Classification: None
Impairments: None
Aquatic T&E Species? No Comments:
NRTR Stream ID: SES Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body? No Deck Drains Discharge Over Buffer? N/A Dissipator Pads Provided in Buffer? N/A
Deck Drains Discharge Over Water Body? N/A (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)
Surface Water Body(3): Left Fork Belews Creek NCDWR Stream Index No.: 22-27-5
NCDWR Surface Water Classification for Water Body Primary Classification: Class C
Supplemental Classification: None
Other Stream Classification: None
Impairments: None
Aquatic T&E Species? No Comments:
NRTR Stream ID: SEL Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body? No Deck Drains Discharge Over Buffer? N/A Dissipator Pads Provided in Buffer? N/A
Deck Drains Discharge Over Water Body? N/A (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)

I tig hwa North Carolina Department of Transportation
gStorrn ! Highway Stormwater Program
STORM WATER MANAGEMENT PLAN °" Ap'
(Version 2.08;Released April 2018) FOR NCDOT PROJECTS
WBS Element: TIP No.: R-2577A County(ies): Forsyth 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. Projects) Water Body Type Riprap Type (ac) Structure (in) (cfs) (fps) Buffer Rules?
17 L-252+50 RT Lowery Mill PSH Class'B' 1.1 Pipe 24 5.4 0.8 No
36.1656162,-080.1370451 Creek
I 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.