20190090 Ver 1_U-5827 SWMP_20190118

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Slill"ll]iYd[Pf Highway Stormwater Program '
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STORMWATER MANAGEMENT PLAN ��••-=���r
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: 44400.2.1 TIP No.: U-5827 County(ies): Wake Page 1 of 3
General Project Information
WBS Element: 44400.2.1 TIP Number: U-5827 Project Type: Roadway Widening Date: 1/7/2019
NCDOT Contact: S. Reid Davidson Contractor / Designer: MI Engineerin , PLLC (Andrew Nottin ham)
Address: Division 5 Project Delivery Address: 1011 Schaub Dr
2612 North Duke Street Suite 100
Durham, NC 27704 Raleigh NC 27606
Phone: [phone] Phone: [phone]
Email: srdavison ncdot. ov Email: anottin ham mi-en ineers.com
Cit ITown: Research Trian le Park County(ies): Wake
River Basin(s): Cape Fear Neuse CAMA County? No
Wetlands within Project Limits? Yes
Pro'ect Description
Project Length (lin. miles or feet): 0.71 mi. Surrounding Land Use: Forest, Short Grass, Residential
Proposed Pro'ect Existin Site
Pro'ect Built-Upon Area ac. 92 ac. 3.6 ac.
Typical Cross Section Description: 2@ 12' lanes curb and gutter section with side walk and 4 lane curb and gutter section No roadway (project is mostly on new location). 4 lane curb and gutter section at
with raised grass median. Future typical will be 4 lane curb and gutter section with raised beginning of project and a 2 lane shoulder section at end of project.
grass median. Ties into 4 lane curb and gutter section at beginning of project and a 2
lane shoulder section at end of project.
Annual Avg Daily Traffic (veh/hr/day): Design/Future: 10000 Year: 2040 Existing: 6800 Year: 2018
General Project Narrative: The Project involves extending Loius Stephens Drive (SR 1632) from Okelly Chapel Road (SR1628) in Research Triangle Park to Poplar Pike Lane in Morrisville. The project
(Description of Minimization of Water runs along a ridge from 500' west of Parkside Valley Drive to the end of the project just west of Gray Marble Road. There are existing apartment developements on both sides
Quality Impacts) of the road as well as existing steep terrain on the south side of the project. Due to these constraints there are not any good drainage outfalls along this stretch of roadway. The
West end of the project has to go underneath existing I-540 which results in the roadway profile undercutting a existing outfall just west of I-540. Therefore most of the project
drainage is drained in a stormdrain system from just west of Gray Marble Road to a Tributary of Kit Creek located just west of I-540. Two grass swales are proposed to treat
runoff from the storm drain system before it enters the Tributary of Kit Creek. The two grass swales have been designed to the maximum extent practicable to treat as much of
the runoff as possible. 12" inch pipes have been designed to drain the low flow portion of the runoff from the stormdrain system at two seperate locations and each will drain into
a grass swale prior to entering the Creek. The grass swales are documented in the grass swale section of this SMP. The 12" pipes have been set 1' lower in the storm drain
system catch basins so the first flush of the rainfall will drain into the grass swales for treatment and the higher flows will bypass the grass swales and drain into the creek
through a rip rap lined channel to prevent erosion.
Waterbody Information
Surface Water Body (1): Kit Creek NCDWR Stream Index No.: 16-41-1-17-2-(0.7)
NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply IV (WS-IV)
Supplemental Classification: Nutrient Sensitive Waters (NSW)
Other Stream Classification: None
Impairments: None
Aquatic T&E Species? No Comments:
NRTR Stream ID: N/A Buffer Rules in Effect: Jordan Lake
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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, Highway Stormwater Program _
STORMWATER MANAGEMENT PLAN .��•••-= •
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: 44400.2.1 TIP No.: U-5827 County(ies): Wake Page 2 of 3
Additional Waterbod Information
Surface Water Body (2): Crabtree Creek NCDWR Stream Index No.: 27-33-(1)
NCDWR Surface Water Classification for Water Body Primar Classification: Class C
Supplemental Classification: Nutrient Sensitive Waters NSW)
Other Stream Classification: None
Impairments: None
Aquatic TB,E Species? No Comments:
NRTR Stream ID: N/A Buffer Rules in Effect: N/A
Pro'ect Includes Bridge Spannin 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): Morris Branch NCDWR Stream Index No.: 16-41-1-17-3-1
NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply IV (WS-IV)
Supplemental Classification: Nutrient Sensitive Waters NSW
Other Stream Classification: None
Impairments: None
Aquatic TB,E Species? No Comments:
NRTR Stream ID: N/A Buffer Rules in Effect: N/A
Project Includes Brid e Spannin Water Body? No Deck Drains Dischar e Over Buffer? N/A Dissipator Pads Provided in Buffer? N/A
Deck Drains Dischar e Over Water Bod ? 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 ll�;l"l�v�y North Carolina Department of Transportation
St(�Y121WdYP1' �
�„ ,�<.,� Highway Stormwater Program �'�'
STORMWATER MANAGEMENT PLAN
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: 444002.1 TIP No.: U-5827 Count ies : Wake Pa e 3 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 28+50 -L- LT (1)Unnamed 2 0 3.0 3.0 12.4 1240 85 0.47°/ 6.9 1.7 7.6 1.7 Yes Yes
35.846557,-78.879130 Tributary to
4 27+50 -L- LT (1)Unnamed 2 0 3.0 3.0 12.4 1240 50 2.80°/ 7.6 3.3 8.4 3.4 Yes Yes
35.846378,-78.878998 Tributary to
Additional Comments