20211018 Ver 1_I-5972_HYD_SMPv2.08_(20210602) (Apr 2018)_20210621

(Version 2.08; Released April 2018)44989.1.1TIP No.:I-5972County(ies):Johnston Page 1 of 1TIP Number:Date:Phone:Phone:Email:Email:County(ies):CAMA County?YesDesign/Future:Year:2040Existing:Year:Aquatic T&E Species?NoComments:NoN/AN/AWetlands within Project Limits?Nutrient Sensitive Waters (NSW)NoneSupplemental Classification: Commercial/Industrial/ResidentialUT to Polecat Branch27-4642.90.667 milesProject DescriptionProposed ProjectNeuseRiver Basin(s): City/Town:65.0Typical Cross Section Description: Surrounding Land Use: General Project Narrative:(Description of Minimization of Water Quality Impacts)[e-mail], NC 27895Address:6/2/2021JohnstonSmithfieldRussell Broadwell, PE509 Ward Blvd. PO Box 3165WBS Element:Roadway RelocationWBS Element:RK&K: Brent Huskey, PENCDOT Contact:252-640-6409Forum 1, Suite 700Raleigh, NC 27615Contractor / Designer:919-878-95608601 Six Forks RoadNorth Carolina Department of TransportationHighway Stormwater Program STORMWATER MANAGEMENT PLAN FOR NCDOT PROJECTSProject Type:NC Department of TransportationAddress:General Project InformationI-597244989.1.1Impairments:Other Stream Classification: Primary Classification: Project Built-Upon Area (ac.)A new culvert conveying an Unnamed Tributary (UT) to Polecat Branch under SR 2507 (Mallard Road) is proposed as part of North Carolina Department of Transportation (NCDOT) Project I5972. SR 2507 is a new alignment and there is no existing culvert. The structure is proposed to be a double 8’x5’ reinforced concrete box culvert (RCBC) parallel with the existing channel, which is skewed 67.2-degrees to SR 2507. SR 2507 is a local road. Per Table 7-1 from the 2016 NCDOT Guidelines for Drainage Studies and Hydraulic Design, the design storm is the 25-year event. However, the critical flow in designing this crossing is the 100year. The structure was sized to prevent future flooding of the upstream America’s Best Value Inn Smithfield in this eventDrainage through the project has also been updated to meet required design storms including under the -L- , -Y1- and the ramps.Buffer Rules in Effect:SANone13,600I-95 North and Southbound: (2)-12' lanes with a 4' inside shoulder and 10' outside shoulder. 40' shoulders under the US 70 Bus bridge.US 70 Bus/Market Street: Divided four lane highway; 14' outside lanes, 12' inside lanes. Curb and gutter with sections of open shoulder.Mallard Road: New location undivided (2)-12' lanes with a 12' two-way left turn lane, open shoulders.Waterbody Information2017NCDWR Stream Index No.:NRTR Stream ID:Annual Avg Daily Traffic (veh/hr/day):Existing SiteProject Length (lin. miles or feet): ac.Surface Water Body (1): Class CNCDWR Surface Water Classification for Water Bodyac.I-95 North and Southbound: (2)-12' lanes with a 4' inside shoulder and 10' outside shoulder.US 70 Bus/Market Street: (2)-12' lanes with 2' shoulders and turn lanes.17,[e-mail] Includes Bridge Spanning Water Body? Deck Drains Discharge Over Buffer? Dissipator Pads Provided in Buffer?N/ADeck Drains Discharge Over Water Body?(If yes, provide justification in the General Project Narrative) (If yes, describe in the General Project Narrative; if no, justify in the General Project Narrative)(If yes, provide justification in the General Project Narrative)