20170219 Ver 1_Stormwater Info_20170221

k 11�;11��'<14' North Carolina Department of Transportation ��
SL[�rtl]�YdtPf Highway Stormwater Program
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STORMWATER MANAGEMENT PLAN ��--•
(Version 2.01; Released December 2014) FOR NCDOT PROJECTS
WBS Element: 17BP.7.R.87 TIP No.: 176P.7.R.87 (400431) County(ies): Guilford Page 1 of 1
General Project Information
WBS Element: 17BP.7.R.87 TIP Number: 17BP.7.R.87 400431 Project Type: Bridge Replacement Date: 10/20/2016
NCDOT Contact: Galen Cail, PE Contractor I Designer: Dan Duffield, P.E.
Address: NCDOT Hydraulics Unit Address: Summit Design and Engineering Services
1100 Birch Ridge Drive 100 East Six Forks Road, Suite 300
Ralei h, NC 27610 Ralei h, NC 27609
Phone: [phone] Phone: [phone]
Email: cail ncdot. ov Email: dan.duffield summitde.net
Cit ITown: Osceola Count ies): Guilford
River Basin s: Ca e Fear CAMA County? No
Wetlands within Project Limits? No
Pro'ect Description
Pro'ect Len th iin. miles or feet : 275 lin. Feet Surrounding Land Use: Agriculture, Forest
Proposed Pro'ect Existin Site
Pro'ect Buiit-Upon Area ac. 0.18 ac. 0.13 ac.
Typical Cross Section Description: 2 lane road with 10' travel lanes, and 6' shoulder including 4' paved shoulder. There will 2 lane road with 10' travel lanes and no paved shoulder.
be guardrail installed along the road, overtop of the culvert, for added safety and to
reduce natural system impacts.
Annual Avg Daily Traffic (veh/hr/day): Design/Future: Year: Existin : 820 Year:
General Project Narrative: The project consists of replacing Bridge 400431 on SR 2719 (High Rock Rd) over UT to Reedy Fork. The existing structure consist of precast prestressed concrete channels
(Description of Minimization of Water with a sufficiency rating of 28.62 The proposed structure is a double 11' X 10' cast-in-place reinforced concrete box culvert. The culvert has been sized as to have one barrel
Quality Impacts) match the existing channel to the greatest extent possible and is burried 1.0' below the existing bed and back filled with native stream material. The other barrel will have a sill
and will only allow for high flow. A base ditch will be constructed in the southwest quadrant of the project which runs along SR 2719 and has been widened from a V ditch to a
base ditch because there is an existing grade change in the existing ditch and thus transfers to the proposed ditch in between stations 11+75-L- RT and station 12+00 -L- RT.
The slope of the proposed ditch changes at station 12+75 -L- RT from a slope of 5.8% to slope of 11.7% which is near the culvert inlet and stream and riprap lined. This ditch
follows the lay of the land and the Q2 velocities are 4.2 ft/sec for the grass lined section and 4.0 ft/sec for the riprap lined section. A riprap energy dissapotor has been added at
the outlet of the ditch. The other three quadrants do not have proposed ditches.
Waterbody Information
Surface Water Body (1): UT to Reedy Fork NCDWR Stream Index No.: 16-11-(9)
NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply V(WS-V)
Supplemental Classification: Nutrient Sensitive Waters (NSW)
Other Stream Classification:
Impairments:
ThreatenedlEndangered Species? Comments:
NRTR Stream ID: Buffer Rules in Effect: Jordan Lake
Project Includes Bridge Spanning Water Body? No 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)