20200030 Ver 1_Laurel_Hill_(SR1321)_SW_Mgmt_plan_20200107

E lj� El\t �1V North Carolina Department of Transportation
�li)1l Highway Stormwater Program
STORMWATER MANAGEMENT PLAN U1*
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: DF15408.2083804 TIP No.: County(ies): SCOTLAND Page 1 of 1
General Project Information
WBS Element:
DF15408.2083804 ITIP Number: Project Type: Other Date:
NCDOT Contact:
Tim Welch, PE
Contractor / Desi ner:
IMI Engineering, PLLC
Address:
121 DOT Drive
Carthage, NC 28327
Address:
1011 Schaub Dr
Suite 100
Raleigh, NC 27606
Phone:
910 773-8032
Phone:
919 851-6606
Email:
[e-mail]
Email:
City/Town:
Laurinbur
Count Ees :
Scotland
River Basin(s):
Lumber
CAMA Count ?
No
Wetlands within Project Limits?
Yes
Project Description
Project Length (lin. miles or feet):
0.104 mi. I Surrounding Land Use: lWoods, Residential, Cultivated Row Crops
AME Proposed Project
Exist!n Site
Project Built -Upon Area ac.
0.4 ac.
0.3 ac.
Typical Cross Section Description:
2 Lanes undivided highway with 11ft lanes, normal crown
2 lanes undivided highway with 11ft lanes, normal crown.
Annual Avg Daily Traffic (veh/hr/day):
Design/Future: LINK Year:
Existing: LINK Year:
General Project Narrative:
(Description of Minimization of Water
Quality Impacts)
Existing Culvert 82-2042, 95in. x 67in. Corrugated Metal Pipe Arch, appx. 40' in length on SR-1321 was blown out during Hurricane Florence. Emergency 84in. CMP appx 48'
in length and Roadway fill was installed to establish temporary service. Emergency 84in. CMP is undersized and will not support high conveyance during major flood events.
The proposed culvert is a 2@10'x6' RCBC with bevels, 51.5ft. in length, buried 1ft. with sills and filled with native material. Upstream invert 224.75ft. and downstream invert
224.75ft, slope 0.0%. Roadway drainage runs off on either side of the proposed roadway and disperses into wetlands and/or natural ground. Construction of the new culvert will
take place while an off -site detour maintains traffic. Bank Stabilization rip rap will be installed as necessary to prevent streambank degradation.
Waterbody Information
Surface Water Body 1 : Leith Creek Upper
NCDWR Stream Index No.:
14-33
NCDWR Surface Water Classification for Water Body
Primary Classification:
Class C
Supplemental Classification:
Swamp Waters Sw
Other Stream Classification:
None
Impairments:
None
Aquatic T&E Species?
No Comments:
NRTR Stream ID:
N/A
Buffer Rules in Effect: N/A
Project Includes Bridge Spanning Water Body?
Yes
I Deck Drains Discharge Over Buffer? INo
Dissipator Pads Provided in Buffer? N/A
Deck Drains Discharge Over Water Body?
INo
I (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)