20170968 Ver 1_310072 Stormwater Management Plan_20180220

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STORMWATER MANAGEMENT PLAN ��••-= ��r
(Version 2.06; Released June 2016) FOR NCDOT PROJECTS
WBS Element: 15005.1032011 TIP No.: SF-310072 County(ies): Durham Page 1 of 1
General Project Information
WBS Element: 15005.1032011 TIP Number: SF-310072 Project Type: Bridge Replacement Date: 2/8/2018
NCDOT Contact: Chris Murra Contractor / Designer: Christopher Lewis
Address: z612 North Duke St. Address: 1020 Birch Ridge Dr.
Durham, NC 27704 Raleigh, NC 27610
Phone: [phone] Phone: [phone]
Email: cmurra ncdot. ov Email: crlewis2 ncdot. ov
Cit ITown: Durham Count ies : Durham
River Basin(s): Neuse CAMA County? No
Wetlands within Project Limits? No
Pro'ect Description
Project Length (lin. miles or feet): 0.18 Surrounding Land Use: Lake
Proposed Pro'ect Existin Site
Pro'ect Built-Upon Area ac. 0.7 ac. 0.5 ac.
Typical Cross Section Description: 11' travel lanes with 4' paved shoulders. 6' to shoulder point and 9' with guardrail. 10' travel lanes with 7' shoulders
Annual Avg Daily Traffic (veh/hr/day): Design/Future: 1700 Year: 2025 Existing: 850 Year: 2017
General Project Narrative: 15005.1032011 is the replacement 2@ 120" Corrugated Metal Pipes over Panther Creek in Falls Lake on SR 1637 (Redwood Rd.). The existing 2@ 120" CMP sustained
(Description of Minimization of Water severe damage during Hurricane Matthew, which resulted in the emergency replacement of the structures. Due to the severity of the damage and the impending loss of the
Quality Impacts) roadway embankment into Falls Lake, the pipes were removed and the embankment was stabilized prior to the installation of the proposed structure. The proposed structure is
a 1@105' 39" Box Beam structure that will span the newly constructed channel over Panther Creek/Falls Lake. Due to the environmental sensitivity of the site, site constraints
and excessive costs of construction it was determined that a bridge structure would be the most practicable design alternative. Redwood Rd. is a causeway facility crossing
Panther Creek/Falls Lake allowing for negligible opportunity to provide treatment for surface stormwater runoff. As a result of this site constraint, modified concrete flumes have
been proposed to provide conveyance of surtace water runoff from the transportation facility. These flumes are extended to the rip rap slope protection that runs the entire
length of the causeway facility. The extension of the flumes is necessary to prevent possible erosion of the shoulder due to surface water runoff as well as alleviate standing
water in the travel lanes which would be viewed as a safety concern for the motoring public. All other natural drainage patterns have been maintained.
Waterbody Information
Surface Water Body (1): Falls Lake NCDWR Stream Index No.: 27-(5.5)
NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply IV (WS-IV) Class B
Supplemental Classification: Nutrient Sensitive Waters (NSW)
Other Stream Classification: None
Impairments: None
Aquatic T&E Species? No Comments:
NRTR Stream ID: Buffer Rules in Effect: Neuse
Project Includes Bridge Spanning Water Body? Yes Deck Drains Discharge Over Buffer? No Dissipator Pads Provided in Buffer? N/A
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)