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Home My WebLink About20201086 Ver 1_GMisc_U5026_R5720_Avoidance_and_Minimization_&_4A_Measures_20200825AVOIDANCE AND MINIMIZATION The NCDOT is committed to incorporating all reasonable and practicable design features to avoid and minimize jurisdictional impacts, and to provide either on-site or compensatory mitigation of all remaining, unavoidable jurisdictional impacts. Avoidance measures were taken during the planning and NEPA/SEPA compliance stages; minimization measures were incorporated as part of the project design. Avoidance and Minimization All jurisdictional features were delineated, field verified and surveyed within the right of way for U-5026/R-5720. Using these surveyed features, preliminary designs were adjusted to avoid and/or minimize impacts to jurisdictional areas. NCDOT employs many strategies to avoid and minimize impacts to jurisdictional areas in all of its designs. All wetland areas not affected by the project will be protected from unnecessary encroachment. Individual avoidance and minimization efforts are detailed below for the project. Site specific measures are detailed by name and impact sheet number for ease in identification in the plan set. General Avoidance and Minimization Efforts • NCDOT will minimize long-term water quality impacts using the most recent Best Management Practices for Protection of Surface Waters, as identified in the Federal Aid Highway Program (FHPM) and North Carolina Administrative Code, Chapter 4. • Sediment and erosion control measures will accommodate a 25-year storm event. • NCDOT will avoid placing erosion control devices in wetlands. • Special sediment control fence will be used at wetlands and low areas along the standard silt fence. • Riprap will only be placed in the bed of the channels during stabilization of outlet structures as necessary to prevent further degradation of the stream systems. These locations are illustrated on the attached plans. • The use of 3:1 fill slopes in jurisdictional areas where practicable. • Ditches and pipes that outlet adjacent to wetlands have been designed to have non-erosive velocities. • Bank stabilization is being utilized along jurisdictional features to minimize erosion potential at channel ties or pipe/culvert outlets. Avoidance of Jurisdictional Resources • Impacts have been avoided for the features SA, SG, WA, WC, WD, WE, WF, WG, WH, WI, WJ, WM, WP, WQ, WR, WS, WU, WV, WW, WX, and WY within the U-5026 project area. Impacts have been avoided for Stony Creek within the R-5720 project area. • Impacts to buffers of SA and SG within the U-5026 project and Stony Creek within the R- 5720 project were avoided. Avoidance/Minimization of Impacts to Stormwater Control Measures • Existing Stormwater Control Measures (SCM) were avoided to the extent practical throughout the project. • A stormwater management plan has been developed and is attached. Stream Relocation Stream F (Site 6) is located parallel to the north side of Sunset Avenue. Roadway fill accounts for 1,192 linear feet of permanent impacts to Stream F. Instead of piping, 990 linear feet of channel will be relocated and tied in further downstream. A 1.3 acre streambank reforestation plan has been developed for the new channel alignment. Please see attached documents. NEPA/404 MERGER TEAM AGREEMENT Concurrence Point No. 4A: Avoidance and Minimization Measures PROJECT DESCRIPTION: Sunset A venue (SR 1770) Interchange and Improvements Nash County STIP Project No. U-5026 STIP Project# U-5026 involves converting the existing Sunset Avenue (SR 1770) grade separation with I 95 to an interchange; widening Sunset Avenue between Old Carriage Road (SR 1603) and Halifax Road (SR 1544); and extending the existing collector-distributor along I-95 at US 64 to the south of the proposed interchange. The proposed project is in Rocky Mount, which is located in eastern Nash County. A voidance and Minimization A voidance and minimization measures are described for the jurisdictional resources in the August 21,2019 Concurrence Point (CP) 4A merger packet and summarized below. Additional minimization may be achieved during final design, when hydraulic design (CP 4B and 4C) and utility relocation design commence. Measures to avoid and minimize impacts to potential jurisdictional waters of the US were incorporated into the best fit design of the project. The presence of residential and commercial buildings, existing structures, and utility transmission lines were also taken into consideration. As designs are refined, reductions to stream and wetland impacts are anticipated. Opportunities for avoidance and minimization were limited due to the nature of the project and the location of the potentially jurisdictional resources located in the vicinity of the project. The preliminary design includes a 17'6" median instead of a 23' median where possible, east of the roundabout at Nash Community College along Eastern Avenue/Sunset Avenue, to reduce the project footprint. During the August 21,2019 Concurrence Point 4A Merger Meeting, the Merger Team requested supplemental information regarding design decisions and avoidance and minimization efforts. Accordingly, the following table acknowledges the impacted features and characterizes the related constraints and/or minimization efforts incorporated into the proposed project. Summary of Design Constraints and A voidance and Minimization Env. Feature Impacting Design Design Constraint or Minimization/ A voidance Feature Effort WetlandB SB entrance ramp Ramp/loop must be placed in southern quadrants due to ramp spacing requirements WetlandJ Freight Rd tie Minor widening at project tie; impacts may be eliminated in final design WetlandL Southern terminus of Wetland pocket runs adjacent to 1-95 corridor; SB C-D road impacts by C-D road unavoidable WetlandO Southern terminus of Wetland pocket runs adjacent to 1-95 corridor; NB C-D road impacts by C-D road unavoidable WetlandBA SR 1770 widening Wetland pocket located north of existing road; widening is proposed more to the south in an effort to minimize impacts WetlandBB SR 1770 widening just Grade dictated by vertical clearance requirements east ofl-95 for 1-95 bridge; existing RR bridges along 1-95 present southern constraint WetlandBD SB C-D road Wetland pocket runs adjacent to 1-95 corridor; impacts by C-D road unavoidable Wetland BE SB C-D road Wetland pocket runs adjacent to 1-95 corridor; impacts by C-D road unavoidable WetlandBF SB entrance ramp Ramp/loop must be placed in southern quadrants due to ramp spacing r~uirements WetlandBJ Southern terminus of Wetland pocket runs adjacent to 1-95 corridor; SB C-D road impacts may be eliminated in final design WetlandBK NB C-D road Wetland pocket runs adjacent to 1-95 corridor; impacts by C-D road unavoidable WetlandBM SR 1770 widening Proposed U-turn bulb-out located to serve Ben Layton Circle; bulb-out could potentially be shifted to west to avoid impact WetlandBN SR 1770 widening Located opposite Stream B; alignment avoids residential relocations on Gardenia Cir Wetland T NB C-D road Wetland pocket runs adjacent to 1-95 corridor; impacts by C-D road unavoidable StreamB SR 1770 widening Located opposite Wetland BN; design avoids residential relocations on Gardenia Cir Stream C SB C-D road Located immediately adjacent to 1-95 corridor; impacts by C-D road unavoidable StreamD SR 1770 widening just Horizontal layout to achieve deflection at east ofl-95 roundabout; grade dictated by vertical clearance requirements for 1-95 bridge StreamE SB entrance ramp Ramp/loop must be placed in southern quadrants due to ramp spacing requirements Stream F SR 1770 widening east Grade dictated by vertical clearance requirements and west of 1-95 for 1-95 bridge; existing RR bridges along 1-95 present southern constraint The Project Team has concurred by signature and date below on the avoidance and minimization measures that have been incorporated into the project design to-date, as described in detail in the CP 4A merger packet. Agency Signature Agency Signature 9/18/2019 9/17/2019 ~ips of Engineers nviroruriental Protection Agency ~--~ .).1~ ~~ 9/18/2019 ~JfsW<tfA4<f·wildlife Service 9/19/2019 ~~/2019 ~Of Water Resources ~~ 9/16/2019 N=Opartment of Transportation Federal Highway Administration 9/19/2019