20180080 Ver 1_B-4662 SWBMP_20180118

(Version 2.07; Released October 2016)17BP.5.R.99TIP No.:B-4662County(ies):Wake Page 1 of 2TIP Number:Date:Phone:Phone:Email:Email:County(ies):CAMA County?YesDesign/Future:Year:2040Existing:Year:Aquatic T&E Species?NoComments:YesNoNoWetlands within Project Limits?Nutrient Sensitive Waters (NSW)NoneSupplemental Classification: ruralMoccasin Creek27-86-20.60.265 milesProject DescriptionProposed ProjectNeuseRiver Basin(s): City/Town:0.8Typical Cross Section Description: Surrounding Land Use: General Project Narrative:(Description of Minimization of Water Quality Impacts)[e-mail]:1/9/2018WakeChris MurrayDurham, NC 27704WBS Element:Bridge ReplacementWBS Element:MI Engineering / Andrew Nottingham, PENCDOT Contact:919-220-4660Suite 100Raleigh, NC 27606Contractor / Designer:919-851-66061011 Schaub DriveNorth Carolina Department of TransportationHighway Stormwater Program STORMWATER MANAGEMENT PLAN FOR NCDOT PROJECTSProject Type:2612 North Duke StreetAddress:General Project InformationB-466217BP.5.R.99Impairments:Other Stream Classification: Primary Classification: Project Built-Upon Area (ac.)The existing bridge over Moccasin Creek is a 2 span bridge of 1 @ 20.7' and 1 @ 19.4' (total length of 40.1') with timber floor on continuous I-beams with timber caps and piles. The existing bridge will be replaced while the road is closed (no detour brdige). Drainage from the existing bridge discharges directly into moccasin Creek from the bridge deck. The replacement structure is a single span of 1 @ 70' Cored Slab Unit Bridge with 105 degree skew. Discharge from new bridge is collected in a 2GI drainage inlet at lower (Northwest) end of bridge and outlets into a rip rap pad into grass swale. Drainage on Northwest side of Moccasin Creek drains through approximately 200' of grassed line roadway ditch and then 50' of Grassed Swale before entering buffer zone (total DA is 1.22 AC). Only 50' of Grassed Swale was able to be obtained at this location due topography. Drainage on Southwest side of Moccasin Creek drains through approximately 150' of grass lined roadway ditch and outlets into rip rap dissipator pad and is dispersed into wetlands at non erosive velocities before entering buffer zone. Drainage on Northeast side of Moccasin Creek drains through a rip rapped lined ditch through the buffer and into the creek. Due to the steep topography (4% to 9% slope) on this side it was not possible to provide grass swale treatment (total DA of riprapped lined ditch is 0.3 AC). Drainage on Southeast side of Moccasin Creek drains through rip rapped lined ditch and then outlets into rip rap energy dissipator pad and is dispersed into wetlands at non erosive velocities before entering buffer zone. Erosion control on the project will be designed to sensistive watershed standards. NeuseBuffer Rules in Effect:N/ANone4002 lanes undivided secondary road with 10' lanes and 5' shoulders (2' of shoulder is paved).Waterbody Information2013NCDWR Stream Index No.:NRTR Stream ID:Annual Avg Daily Traffic (veh/hr/day):Existing SiteProject Length (lin. miles or feet): ac.Surface Water Body (1): Class CNCDWR Surface Water Classification for Water Bodyac.2 lanes undivided secondary road with 9.0' to 10' lanes and grass [e-mail] Includes Bridge Spanning Water Body?Deck Drains Discharge Over Buffer?Dissipator Pads Provided in Buffer?N/ADeck Drains Discharge Over Water Body?(If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the General Project Narrative)(If yes, provide justification in the General Project Narrative)
(Version 2.07; Released October 2016)
17BP.5.R.99 TIP No.:B-4662 County(ies):Wake Page 2 of 2
Sheet
No.
Station & Coordinates
(Road and Non Road
Projects)
Surface
Water
Body
Base
Width
(ft)
Front
Slope
(H:1)
Back
Slope
(H:1)
Drainage
Area
(ac)
Recommended
Treatm't Length
(ft)
Actual
Length
(ft)
Longitudinal
Slope
(%)
Q2
(cfs)
V2
(fps)
Q10
(cfs)
V10
(fps)
Rock
Checks
Used
BMP
Associated w/
Buffer Rules?
15+50 TO 16+00 -L- LT
35.8993684 / -078.3324419
North Carolina Department of Transportation
Highway Stormwater Program
STORMWATER MANAGEMENT PLAN
FOR NCDOT PROJECTS
Additional Comments
No(1)Moccasin
Creek
Swales
Yes1.51.2 122 2.70.0 3.0 3.0 504 2.1
WBS Element:
1.40.78%