20151208 Ver 1_Bridge 60 NWP14 Application Attachments_reduced 1_20151118

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STORMWATER MANAGEMENT PLAN --
(Version 2.02; Released April 2015) FOR NCDOT PROJECTS
WBS Element: 17BP.7.R.63 TIP No.: SF-670060 County(ies): Orange Page 1 of 2
General Project Information
WBS Element: 17BP.7.R.63 TIP Number: SF-670060 Project Type: Bridge Replacement Date: 8/31/2015
NCDOT Contact: Galen Cail Contractor / Designer: Alpha & Omega Group, PC
Address: Hydraulics Unit Address: 4601 Lake Boone Trail, Ste. 3C
1020 Birge Ridge Drive Raleigh, NC 27607
Raleigh NC 27610
Phone: [phone] Phone: [phone]
Email: gcail@ncdotgov Email:
City/Town: Hillsborough County(ies): Orange
River Basin(s): Neuse CAMA County? No
Wetlands within Project Limits?
Project Description
Project Length (lin. miles or feet): 350 ft Surrounding Land Use: Rural
Proposed Project Existing Site
Project Built-Upon Area ac. 0.2 ac. 0.2 ac.
Typical Cross Section Description: 2 lane road with 11' travel lanes, 2' paved shoulder and 2' grassed shoulder without
guardrail, and 4' paved shoulder and 3' grassed shoulder with guardrail
Annual Avg Daily Traffic (veh/hr/day): Design/Future: Year: Existing: 2400 Year: 2013
General Project Narrative: The project consists of replacement of Bridge 60 on SR 1002 (Saint Marys Road) over UT to Buckwater Creek and associated roadway work. The existing structure is a single
(Description of Minimization of Water span 19.25' x 12" single span timber deck bridge on I-beams. The existing structure sufficiency rating was listed as 49.1 on the Bridge Inspection Report (from February 8,
Quality Impacts) 2011). The proposed structure will be a 17' x 8.5' bottomless culvert with a concrete footing keyed into bedrock. The proposed structure will be approximately 48.25' in length.
The project limits extend from station 11+00 to Station 14+50. The project will increase impervious surface by 1750 square feet (0.04 acres). The increased flow from
impervious surFaces will be directed through existing grassed channels on the northeast and southeast sides of the proposed bottomless culvert; and through relocated channels
lined with riprap on the northwest and southwest sides of the proposed bottomless culvert. This treatment provides sufficient filtration in accordance with the NCDOT Alternative
Design Criteria.
Waterbody Information
Surface Water Body (1): Buckwater Creek Tributary 2 NCDWR Stream Index No.: 27-2-12
NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply IV (WS-IV) Water Supply IV (WS-IV)
Supplemental Classification: Nutrient Sensitive Waters (NSW NSW
Other Stream Classification:
Impairments: None
Aquatic T&E Species? Comments:
NRTR Stream ID: Buffer Rules in Effect: Neuse
Pro'ect Includes Bridge Spannin Water Body? Yes 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)