20190200 Ver 1_17BP.5.R.72 SWMP_20190213

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STORMWATER MANAGEMENT PLAN --
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: SF-920009 TIP No.: 17BP.5.R.72 County(ies): Warren Franklin Page 1 of 2
General Project Information
WBS Element: SF-920009 TIP Number: 17BP.5.R.72 Pro'ect T e: Brid e Re lacement Date: 2/1/2019
NCDOT Contact: Galen Cail Contractor I Designer: Frank F. Flemin
Address: 1000 Birch Ridge Drive Address: 1151 SE Cary Parkway
Raleigh, NC 27610 Suite 101
Ca , NC 27518
Phone: [phone] Phone: [phone]
Email: cail ncdot. ov Email: fflemin ecolo icalen .com
City/Town: Warrenton County(ies): Warren Franklin
River Basin s: Tar-Pamlico CAMA County? No No
Wetlands within Project Limits? Yes
Pro'ect Descri tion
Pro'ect Len th lin. miles or feet : 0.10 Surroundin Land Use: Rural residential, farmland
Pro osed Pro'ect Existin Site
Pro'ect Built-Upon Area ac. 0.8 ac. 0.5 ac.
Typical Cross Section Description: 3@12'x8' RCBC 1@22' reinforced concrete slab on reinforced concrete full height abutments on pile
footings
Annual Avg Daily Traffic (vehlhrlday): Desi n/Future: 1940 Year: 2038 Existin : 970 Year: 2018
General Project Narrative: State projects SF-920009 involves the replacement of the existing NCDOT Bridge #920009 on NC-58 over Shocco Creek. Bridge #920009 consists of 1@22' reinforced
(Description of Minimization of Water concrete slab on reinforced concrete full height abutments on pile footings. The proposed crossing is located in Zone AE of FIRM Map number 3720286800K and was studied by
Quality Impacts) "Limited Detailed" methods. No proposed deck drains. Proposed culvert #920009 consists of 3@12'x8' RCBC. SF-920009 begins at STA. 15+75 -L-.
Waterbod Information
Surface Water Body 1: Shocco Creek Overflow NCDWR Stream Index No.: 28-79-22-6
NCDWR Surface Water Ciassification for Water Body Primar Classification: Class C None None
Su lemental Classification: Nutrient Sensitive Waters NSW None None
Other Stream Classification: None None None None None
Im airments: None None None None None
Aquatic T&E Species? No Comments: None
NRTR Stream ID: Buffer Rules in Effect: Tar-Pamlico
Pro'ect Includes Brid e Spannin Water Bod ? Yes Deck Drains Dischar e Over Buffer? No Dissipator Pads Provided in Buffer? No
Deck Drains Dischar e Over Water Bod ? 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)

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STORMWATER MANAGEMENT PLAN �=""—=
(Version 2.08; Released April 2018) FOR NCDOT PROJECTS
WBS Element: SF-920009 TIP No.: 17BP.5.R.7� County(ies): Warren Franklin Page 2 of 2
Bridge to Culvert Avoidance and Minimization
Proposed Structure Summa
Sheet No. & Station Sheet No.: 4 Station: 17+94 -L- Number of Barrels: 3
Drainage Area ac or sq mi : 71 Sq. Miles Barrel Width/Diameter ft): 12'
Surface Water Bod : 1 Shocco Creek Overflow Barrel Height (ft : 8'
Culvert T e: Reinforced Concrete Box Culvert Culvert Len th ft 57.6'
Avoidance and Minimization Efforts: Erosion Control - Bank stabilization with Class II rip rap at 1.5:1 Rock Plating will be utilized on the left (Upstream side) in order to minimize
(Bridge to Culvert) wetland impacts. Impervious dikes will be used for the construction of the culvert. Silt fence will be installed along the fill slopes. During the
construction of the proposed culvert and roadway there shall be minimal clearing of vegetation on the existing shoulders and side slopes. Native
seeding and mulching will be applied to excavated existing roadway embankment.
Stream Slope Fish and/or Aquatic Life Passa e
Existin Avera e Stream Slope %: NA °/o Existing Low Flow Channel Dimensions NA - No channel - overflow structure
Proposed Culvert Slope %: 0.35 °/o in the Stream:
Culvert Burial
Proposed Culvert Burial Depth ft : 1.0'
Existing Streambed Material: Sand/Silt Proposed Low Flow Dimensions 36' wide base channel. W/ 2:1 SS
Through the Culvert:
Proposed Sills/Baffles: NA
Existing Low Flow Velocities in the
Stream ft/s : NA - overflow channel
Proposed Low Flow Velocities Through
the Culvert ft/s : NA - overflow channel
Alternating Low Flow Sills/Baffles: NA
Culvert/Stream Ali nment
Stream Patterns Upstream and No existing channel. Overflow structure.
Downstream of the Culvert that Could
Affect Fish Passage and Bank Stability:
Bed Forms Impacted by Culvert (riffles, NA
pools, glides, etc.):
Low Flow Floodplain Bench Required? No
(provide justification)
Bends at Inlet/Outlet? No
(describe culvert alignment with stream)
Stream Realignment Necessary? (provide No
justification)
Bank Stabilization: Class II Rip Rap
Outlet Velocities
Natural Stream Channel 2-yr Velocity (ft/s): 0.6 Natural Stream Channel 10-yr Velocity (ft/s): 1.1
Proposed Culvert 2-yr Outlet Velocity (ft/s): 2.8 Proposed Culvert 10-yr Outlet Velocity (ft/s): 5.8
Roadway Geometric Considerations
Evaluate/Describe Roadway Geometric Constraints:
A meeting with US Fish and Wildlife and other stakeholders was held on site on 1/26/2017 to discuss alternative alignments and structure types for the replacement of the two bridges. See
discussion items below. There was general consensus to realign the road to the West. There was general consensus that the replacement structure of the overflow bridge (Warren 09) can be a
RC Box Culvert. The entire existing roadway embankment is to be removed to natural ground between the tie-ins with the new and old alignment. This area will be stabilized with Native Seed Mix
and matted.