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Home My WebLink About20161183 Ver 1_670018_Hyd_prm_wet_Package_10282016_20161129k 11�;11��'<14' North Carolina Department of Transportation �� SL[�rtl]�YdtPf Highway Stormwater Program ��` STORMWATER MANAGEMENT PLAN ��--• (Version 2.06; Released June 2016) FOR NCDOT PROJECTS WBS Element: 17BP.7.R.93 TIP No.: SF-670018 County(ies): Orange Page 1 of 2 General Project Information WBS Element: 17BP.7.R.93 TIP Number: SF-670018 Project Type: Bridge Replacement Date: 8/31/2016 NCDOT Contact: Christopher R. Lewis, PE Contractor I Designer: Address: 1020 Birch Ridge Dr. Address: Raleigh, NC 27610 Phone: 919 707-6714 Phone: Email: crlewis2 ncdot. ov Email: Cit ITown: Cedar Grove Count ies): Oran e River Basin s: Ca e Fear CAMA County? No Wetlands within Project Limits? No Pro'ect Description Pro'ect Len th lin. miles or feet : 0.08 Surroundin Land Use: �Noods Proposed Pro'ect Existin Site Pro'ect Buiit-Upon Area ac. 0.2 ac. 0.2 ac. Typical Cross Section Description: 2-10' Lanes with 4' shoulders and 7' shoulders with guardrail 2-10' Lanes with 7' grassed shoulders Annual Avg Daily Traffic (veh/hr/day): Design/Future: 100 Year: 2025 Existin : 50 Year: 2000 General Project Narrative: The project consists of the replacement of Bridge 18 on SR 1421 (Lib Rd.) over East Back Creek Tributary and associated roadway work. The existing structure is a single span (Description of Minimization of Water (1 @1 S'-3"). The proposed structure will be 2@8'X8' RCBC with one low flow barrel and one high flow barrel. The low flow barrel will be buried 1' below the existing stream bed Quality Impacts) elevation and will be backfilled with native material excavated from the stream at the project site during construction. The high flow barrel will be set at the same invert elevation as the low flow barrel, but will have an additional 1' sill to help maintain the existing channel width during low flow events. The high flow barrel will be backfilled with native material and supplemented with rip rap as determined by the Engineer. If rip rap is used to supplement, then native material is to be placed on top of supplemented rip rap to provide a flat surface for animal passage. To accommodate the additional width from the high flow barrel, a flood bench is proposed to help maintain the existing low flow channel and provide conveyance through the culverts during high flow events. The flood bench is to be lined with coir fiber matting and the banks will be stabilized by laying the banks back at a 1.5:1 slope lined with Class II Rip Rap and geotextile. All existing ditches are being left in place and are stable with non-erosive velocities. Toe protection is being used in areas where the toe of fill intersects the ditch point. All outfalls are outside of buffers. Waterbody Information Surface Water Body (1): East Back Creek Tributary NCDWR Stream Index No.: 16-18-(1) NCDWR Surface Water Classification for Water Body Primary Classification: Water Supply II (WS-II) Supplemental Classification: High Quality Waters (HQW) (NSW) Other Stream Classification: None Impairments: None Aquatic T&E Species? No Comments: NRTR Stream ID: Buffer Rules in Effect: Jordan Lake Project Includes Bridge Spanning Water Body? No Deck Drains Discharge Over Buffer? N/A Dissipator Pads Provided in Buffer? N/A Deck Drains Discharge Over Water Body? N/A (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) ,-._- � I Ii�;E71�'�]V North Carolina Department of Transportation �tu��►�xtr�trr ,�- ..- Highway Stormwater Program ° STORMWATER MANAGEMENT PLAN •: .=;^'"` (Version 2.06; Released June 2016) FOR NCDOT PROJECTS WBS Element: 17BP.7.R.93 TIP No.: SF-670018 County(ies): Orange Page 2 of 2 Bridge to Culvert Avoidance and Minimization Proposed Structure Summary Sheet No. & Station Sheet No.: 4 Station: 13+49.5 Number of Barrels: 2 Drainage Area (ac or sq mi): 1 Sq. Miles Barrel Width/Diameter (ft): 8 Surface Water Body: 1 East Back Creek Tributar Barrel Height (ft : 8 Culvert T e: Reinforced Concrete Box Culvert Culvert Length ft 42 Avoidance and Minimization Efforts: The culverts will be buried 1' below the existing stream bed elevation. The low flow channel will align with the existing channel and will be (Bridge to Culvert) backfilled with native bed material. The high flow barrel will have an additional 1' sill to help maintain the existing stream width during low flow events. A floodplain bench is provided to help convey flow through the second barrel during major events. The bench will be lined with coir matting and the banks will be laid back at 1.5:1 and lined with Class II Rip Rap and Geotextile. Stream Slope Fish and/or Aquatic Life Passage Existing Average Stream Slope (°/a): 1.50 % Existing Low Flow Channel Dimensions 8' Proposed Culvert Slope (%): 0.50 % in the Stream: Culvert Burial Proposed Culvert Burial Depth (ft): 1' Existing Streambed Material: Proposed Low Flow Dimensions 8' Through the Culvert: Proposed Sills/Baffles: Sills at both inlet and outlet. The sill in the low flow is 1' and 2' in the high flow. Existing Low Flow Velocities in the Stream (ft/s): 2'� ropose ow ow e oci ies roug the Culvert (ft/s): 2'� Alternating Low Flow Sills/Baffles: No. Culvert/Stream Alignment Stream Patterns Upstream and Downstream Stream is straight with slight meander. of the Culvert that Could Affect Fish Passage and Bank Stability: Bed Forms Impacted by Culvert (riffles, The culvert is placed in a glide. pools, glides, etc.): Low Flow Floodplain Bench Required? Yes Benches up and downstream to transition box and low flow channel to existing stream top of banks. Banks will be laid back at (provide justification) 1.5:1 and lined with Class II Rip Rap and Geotextile. The bench will be lined with coir matting. Sharp Bends at Inlet/Outlet? No (describe culvert alignment with stream) Stream Realignment Necessary? (provide No justification) Bank Stabilization: Class I Rip Rap on banks at inlet and outlet. Existing banks are moderately stable. Outlet Velocities Natural Stream Channel 2-yr Velocity (ft/s): 5.6 Natural Stream Channel 10-yr Velocity (ft/s): 8.1 Proposed Culvert 2-yr Outlet Velocity (ft/s): 4.1 Proposed Culvert 10-yr Outlet Velocity (ft/s): 6.6 Roadway Geometric Considerations Evaluate/Describe Roadway Geometric Constraints: � � � � � V � � O V DESIGN DATA ADT 2000 = 50 ADT 2025 = 100 V = 55 MPH SUB REGIONAL TIER LOCAL �� 1l � �� Y � ��v o��GE �� coU�TY LOCATION: BRIDGE NO. 18 OVER EAST BACK CREEK TRIBUTARY ON SR 1421 (LIB ROAD) TYPE OF WORK: GRADING, PAVING, DRAINAGE AND CULVERT WETLAND AND SURFACE WATER IMPACTS PERMIT r-,y �� , g � j � �� ,qEr ��riE Ei4 l t �. �\4 � ��ar�e �s i PROJECT LENGTH LENGTH ROADWAY TIP PROJECT = LENGTH STRUCTURE TIP PROJECT = TOTAL LENGTH TIP PROJECT = 0.073 MILES 0.003 MILES 0.076 MILES END PROJECT 17BP7R93 Prepored ln ihe Offfce of Hatch Mott MocDawld for DIVISIOIV 7 2012 STANDARD SPEC/FICATIONS LETTING DATE: NCDOT CONTACT: TIM JORDAN, PE PROfECT ENGINEER GALEN CAIL, PE mnrsnuur,s Excrxeex TIM POWERS, PE DIVIS/ON BRIDGE PROGRAA-I MANAGEN STATB STATE PRoIECY RBP6RENCE NO. SHB�ET TOTAL SHEETS �a�a ��o// o�o�� . 38� 28� 24A' E TO SR �36i �4 (PENECOST RD.1—� PERMIT DRAWING SHEET 1 OF 6 BY: M PO Boz 700 Fuquay-Varina, NC D526 (919)552-2253 MOTT (919) 552-2254 �fox) MACDONALD www.mottma�.�om LICENSE NO. F-0669 TOE PROTECTION SEE DETAIL B � i � WOODS TOE PROTECTION SEE DETAIL A V2 =1.1 FPS V10=2.5 FPS �� DENOTES IMPACTS IN SURFACE WATER �DENOTES TEMPORARY IMPACTS IN SURFACE WATER ��I �\\ ��, I I '� � O GUY "�`��-v� ti�'��---� — -------�F RAP� �� 5 D' 0' 5 0' I =50' SR 1421 (Llc F C R AP — — V10=2.3 FPS TOE PROTECTION SEE DETAIL A 5 PROJECT REFERENCE SHEET NO. `-i7�17-1 77BP.7.R.93 - ORANGE 18 X-2 1 0 1 0 I 1 0 1 0 1 0 1 0 2 1 1 2 I 1 0 1 0 1 0 1 0 1 0 1 0 I ll➢�8 1Ldb dN ff3,� iPd. 1V� 0 NOT SE FO CONS RUCT10 � � � � � \ — ... .. .... .. � . . — . . . — .. . \ fi2 .24 /— � . .. .. .. . —.. . . —. .._ — 15 + 0. 0 � � — -- —, �' R. o. zo o. zo 62 .74 \ _ � 15 + 0. 0 i �� 1 vAR 0. Ol 0. 20 V ` � � 61 79 � AR. I � � _ � _ — - _ 14 Q - _ _ —. V X N 3� o. .� 0. 29 0. 29 3: �� ... — , ... .—�'._� . � � / . _. . ._ __�. . ..�._. .._ —' — _ ' a� � I� 61� .80 � . . O� � � � � — � � � _ � � � _ _ 0 ,o � � - E D CUL E T 13 + 8. 5 3 I � j o. 40 o � o. ao � z � I � -- \ �— �� -- �— —, _ _ / �_ _ -- -- —_ � 13 + 0. 0 = 1 0 1 0 1 0 1 0 1 0 7 0 2 1 1 2 1 0 1 0 1 0 1 0 1 0 1 0 WETLAND PERMIT IMPACT SUMMARY WETLAND IMPACTS SURFACE WATER IMPACTS Hand Existing Existing Permanent Temp. Excavation Mechanized Clearing Permanent Temp. Channel Channel Natural Site Station Structure Fillln Fillln in Clearing in SW SW Impacts Impacts Stream No. (From/To) Size / Type Wetlands Wetlands Wetlands in Wetlands Wetlands impacts impacts Permanent Temp. Design (ac) (ac) (ac) (ac) (ac) (ac) (ac) (ft) (ft) (ft) 1 13+53 -L- 2@ 8' x 8' RCBC < 0.01 42 Bank Stabilization < 0.01 < 0.01 57 28 TOTALS*: 0.02 < 0.01 99 28 0 *Rounded totals are sum of actual impacts NOTES: All Temporary Impacts outside of Bank Stabilization include dewatering. 2013 10 24