20170220 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 (400379) County(ies): Guilford Page 1 of 1
General Project Information
WBS Element: 17BP.7.R.87 TIP Number: 17BP.7.R.87 400379 Project Type: Bridge Replacement Date: 1/20/2017
NCDOT Contact: Galen Cail, P.E. 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 57610 Ralei h, NC 27609
Phone: [phone] Phone: [phone]
Email: cail ncdot. ov Email: dan.duffield summitde.net
Cit ITown: Altamahaw Count ies): Guilford
River Basin s: Ca e Fear CAMA County? No
Wetlands within Project Limits? No
Pro'ect Description
Pro'ect Len th fin. miles or feet : 275 lin. Feet Surroundin Land Use: Agriculture, Forest
Proposed Pro'ect Existin Site
Pro'ect Buiit-Upon Area ac. 0.13 ac. 0.12 ac.
Typical Cross Section Description: 2 lane road with 10' travel lanes, and 4' grassed shoulder 2 lane road with 9.5' travel lanes and no paved shoulder.
Annual Avg Daily Traffic (veh/hr/day): Design/Future: Year: Existin : 230 Year:
General Project Narrative: The project consists of replacing Bridge 400379 on SR 2715 (Busick Quarry Rd) over UT to Reedy Fork. The existing structure is a timber deck on timberjoists with a
(Description of Minimization of Water sufficiency rating of 52.96. The proposed structure is a 3@11'x8' RCBC. Runoff will flow down fill slopes on the northern quadrants and will be conveyed across riprap which
Quality Impacts) protects the culvert inlet and outlet. The ditch to the north east is a cut ditch with a velocity of 1.9 fps and a slope of 4.4 % and lined with grass. The ditch to the northwest is an
existing ditch which is being tied to the culvert inlet protection. A special lateral base ditch will be constructed in the southwest quadrant of the project which runs along SR
1725 and has been widened from a V ditch to a base ditch to reduce the velocities to 3.3 fps and has a slope of 1.4 % and lined with grass before being conveyed across the
culvert outlet protection. The culvert has been sized as to have one barrel match the existing channel to the greatest extent possible and is buried 1.0' below the existing bed
and back filled with native stream material. The other two barrels will have sills and will only allow for high flow. As indicated on the permit drawings the proposed pavement
nearly matches the existing with only slight widening for safety (with no guardrail - this will allow for overtopping during highflows) which this small amount of new pavement it will
contribute very little to the existing drainage area and the ditch velocities. Riprap was added to protect and stabilize the stream banks and the old bridge which crosses at 90
degrees has been replaced with a culvert that better matches the stream alignment.
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)