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Home My WebLink About20211557 Ver 1_PCN_Cover_Letter_with_AA_and_Figures_20211026Kimley>»Horn October 26, 2021 Mr. Lyle Phillips U.S. Army Corps of Engineers Raleigh Regulatory Field Office 3331 Heritage Trade Drive, Suite 105 Wake Forest, North Carolina 27587 Mr. Rick Trone NC Division of Water Resources Water Resources — Water Quality Regional Operations Section 3800 Barrett Drive Raleigh, NC 27609 RE: Nationwide Permit 13 Pre -Construction Notification Scott Northern WTCC Campus Pedestrian Bridges - Temporary Stream Repair Raleigh, Wake County, North Carolina Dear Mr. Phillips and Mr. Trone: On behalf of our client, the Wake Tech Community College (WTCC), Kimley-Horn is submitting the attached application for authorization under Nationwide Permits (NWP) #13 for the above referenced project in Wake County. The proposed stream bank repair will include riprap stabilization of the two stream bends beneath two separate pedestrian bridges located with WTCC's northern campus. Additionally, placement of riprap splash pads beneath the bridges is proposed to stabilize stormwater runoff from the bridge structures that is also contributing to the stream bank erosion. On Bridge #1, a pre -formed scour hole is proposed at the outer limit of the riparian buffer to control runoff from the observation/rest deck area attached to the pedestrian bridge that is contributing a substantial amount of overland runoff. The pre -formed scour hole will act as a riprap dissipator pad allowing stormwater to runoff into the forested, stable areas adjacent to the project and naturally attenuate in the upland forest before entering the riparian buffer along S1. Kimley-Horn staff completed a site visit for the project area in April and August 2021 and identified 1 wetland (W1) and 1 perennial stream (S1) within the project area. S1 flows beneath Bridge #1 then continues through a forested corridor before flowing beneath Bridge #2. Due S1 being a clearly perennial stream and mapped on the NRCS Soil Survey for Wake County, S1 is assumed to be jurisdictional and subject to Neuse River Basin Riparian Buffer Rules. Wetland W1 is a narrow headwater wetland that is supported by the outfall of the SCM basin adjacent to the project and is located beneath Bridge #1 on the southern portion of the project area. W1 supports hydrophytic vegetation, has wetland hydrology, and hydric soils and is assumed to be jurisdictional. W1 will not be impacted by the proposed project but will be crossed for construction access where it flows through the former haul road remaining from the bridge construction. The crossing of W1 will utilize mud mats kimley-horn.com 421 Fayetteville Street, Suite 600, Raleigh, NC 27601 919 677 2000 Kimley>»Horn Page 2 and tracked equipment to prevent permanent impacts to W1 and will result in temporary impacts of 0.01 acres at Site 1. Unavoidable permanent no -net loss stream impacts are proposed to S1 in two locations. The proposed stream bank repair will include riprap stabilization of two stream bends beneath the pedestrian bridges and will result in 26 LF of permanent no -net loss impacts to stream S1 at Site 2 and 30 LF of permanent no -net loss impacts to stream S1 at Site 3. Due to the safety zone around the footers of bridges 1 and 2, the proposed repair does not involve any cutting into the banks, but instead is proposing to replace the original eroded bank areas and stabilize with riprap armoring. This fill is not intended to compromise or restrict the stream flow and will only be utilized to armor and stabilize the banks and protect the bridge footers. Additionally, unavoidable temporary stream impacts are proposed to S1 immediately upstream and downstream of the stabilization areas to facilitate the use of a pump -around system for temporary construction dewatering and construction access. These activities will result in 30 LF of temporary impact to S1 at Site 2 and 45 LF of temporary impact to S1 at Site 3. Additionally, the proposed stream bank stabilization will result in permanent impacts to the Neuse River Basin buffer zones along stream S1. In addition to the riprap stabilization along the stream bank at Site 2 and Site 3, riprap will be installed beneath the pedestrian bridges in Zone 1 and Zone 2 to act as a splash pad for runoff from the bridges and to stabilize overland runoff and reduce the erosional hazard of the runoff flowing over the top of the stream bank and prevent the runoff from undermining the stabilization areas. At Site 2 (Bridge #1), a preformed scour hole is proposed at the edge of Zone 2 that will control the stormwater runoff from the bridge's observation deck/rest area that has eroded an area beneath the bridge and is a concentrating in the eroded area and undermining the stream bank. The preformed scour hole will catch the concentrated runoff beneath the bridge and allow the stormwater to slow down and runoff more naturally through the forested area west of the bridge, stabilize and attenuate flow naturally in the riparian buffer, before entering S1. These activities will result in 3,021 ft2 of permanent buffer zone 1 impacts and 1,392 ft2 of permanent buffer zone 2 impacts in total between Site 2 and Site 3. The majority of those impacts are beneath the existing bridges. To minimize additional disturbance to the riparian buffer, construction access is proposed along an existing haul road that was used for bridge construction, meaning no tree clearing is required to access the stream bank stabilization areas. The temporary construction access will result in 1,417 ft2 of temporary buffer zone 1 impacts and 976 ft2 of temporary impacts to buffer zone 2 between Sites 2 and 3. Mitigation No compensatory mitigation is proposed as part of this permit application. The proposed stream bank stabilization will not result in a loss of waters and will repair an actively failing stream bank that is directly risking an existing pedestrian bridge. The stabilization activity proposed will improve downstream water quality by repairing and preventing active erosion on S1 and will protect public safety by ensuring the pedestrian bridge footers are not at risk from the stream channel moving closer to the bridge. Additionally, in accordance with the Neuse River Basin Riparian Buffer Rules, buffer kimley-horn.com 421 Fayetteville Street, Suite 600, Raleigh, NC 27601 919 677 2000 Kimley>»Horn Page 3 impacts resulting from "Bank Stabilization" are considered "allowable upon authorization" and, therefore, do not require mitigation. The temporary disturbance to the riparian buffers have been located along existing disturbed areas and previously used haul roads and avoids permanent impacts to the buffers to the extent practicable. If there is any additional information you need to assist in the processing of this pre -construction notification, please do not hesitate to contact me at (919) 678-4155 or Jason.Hartshorn@Kimley- Horn.com. Sincerely, Jason Hartshorn, PWS kimley-horn.com 421 Fayetteville Street, Suite 600, Raleigh, NC 27601 919 677 2000 AGENT T AUTHORIZATION FORM Name: (/) a- krt O vni n'l o //ey e Address: O / v //e /Q . e/pi Ale. 02-76di Phone: Project Name/Description: Wake Tech Pedestrian Bridge Stream Repair Date: ?l73%e,f The Department of the Army U.S. Army Corps of Engineers, Wilmington District Attention: Lyle Phillips Field Office: Raleigh Regulatory Field Office Re: Wetland Related Consulting and Permitting To Whom It May Concern: Wake Teck Community College hereby designates and authorizes Kimley-Horn and Associates, Inc. to act in my/our behalf as my/our agent solely for the purpose of processing Jurisdictional Determinations, Section 404 permits/Section 401 Water Quality Certifications applications, and Neuse River Basin Riparian Buffer Determinations, and to furnish upon request supplemental information in support of applications, etc. from this day forward until successful completion of the permitting process or revocation by the owner. In addition, 1, the undersigned, a duly authorized owner of record of the property/properties identified herein, do authorize representatives of the Wilmington District, U.S. Army Corps of Engineers (Corps) to enter upon the property herein described for the purpose of conducting on -site investigations and issuing a determination associated with Waters of the U.S. subject to Federal jurisdiction under Section 404 of the Clean Water Act and/or Section 10 of the Rivers and Harbors Act of 1899. Authorized this the S'` day of i 7 r r j , 20 7 / —re,ike_ I T. et A-- r jet - Print Propeerty Owner's Naml r petty Owner'signature Cc: Rick Trone NC Division of Water Resources 401 & Buffer Permitting Unit 1650 Mail Service Center Raleigh, NC 27699-1650 Legend Raleigh Wake County Project Study Area West Virginia Georgia -i Feet 045000 GRANVILLE DURHAM Project Location HARNETT /VANCE FRANKLIN JOHNSTON Kimley>» Horn Figure 1: Vicinity Map Wake Tech Pedestrian Bridge Stream Repair Raleigh, Wake County, NC October 2021 Legend Project Study Area Kimley>» Horn Figure 2: USGS Topographic Map Wake Tech Pedestrian Bridge Stream Repair Raleigh, Wake County, NC October 2021 �j •-- ee•e'-1�'� e•�" Pf er. '�elrll tip �-st'F7lr tTll�AA'!1'-_ --mig VIP A r101t101 1L';A11:F1P� rts'-`F' ee-xis teivvo c r.tp-m ItAa ogi!rnia Legend Project Study Area 0 150 Feet 300 Kimley>>> Horn Figure 3: Aerial Imagery Map Wake Tech Pedestrian Bridge Stream Repair Raleigh, Wake County, NC October 2021 Legend Project Study Area Kimley>» Horn Figure 4: NRCS Soil Survey Map Wake Tech Pedestrian Bridge Stream Repair Raleigh, Wake County, NC October 2021 Impact Site 3: Temporary Stream Impacts: 45 LF Permanent Stream Impacts: 30 LF Temporary BZ1 Impacts: 787 sqft Temporary BZ2 Impacts: 724 sqft Permanent BZ1 Impacts: 1,697 sqft Permanent BZ2 Impacts: 834 sqft Impact Site 2: Temporary Stream Impacts: 30 LF Permanent Stream Impacts: 26 LF Temporary BZ1 Impacts: 630 sqft Temporary BZ2 Impacts: 252 sqft Permanent BZ1 Impacts: 1,324 sqft Permanent BZ2 Impacts: 558 sqft Bridge 0 150 Feet 300 'Bridge 2 Impact Site 1: Temporary Wetland Impacts: 0.01 ac. Legend Temporary Constuction Access Stream Impacts Temporary Pump -Around Stream Impacts ^— Permanent No -Net Loss Stream Bank Stablization Streams Neuse River Buffer Zone 1 Neuse River Buffer Zone 2 Permanent Buffer Zone 1 Impacts Temporary Buffer Zone 1 Impacts Permanent Buffer Zone 2 Impacts Temporary Buffer Zone 2 Impacts Temporary Wetland Impacts Project Study Area Kimley>» Horn Figure 5: Impact Drawings Overview Map Wake Tech Pedestrian Bridge Stream Repair Raleigh, Wake County, NC October 2021 1 rl A r • Arb) 41. • Impact Site 1: Temporary Wetland Impacts: 0.01 ac. 1 t 0 20 Feet 40 Legend Temporary Constuction Access Stream Impacts Temporary Pump -Around Stream Impacts ^— Permanent No -Net Loss Stream Bank Stablization Streams Permanent Buffer Zone 1 Impacts Temporary Buffer Zone 1 Impacts Permanent Buffer Zone 2 Impacts Temporary Buffer Zone 2 Impacts Neuse River Buffer Zone 1 Neuse River Buffer Zone 2 Temporary Wetland Impacts Project Study Area Kimley>» Horn Figure 5.1: Impact Site 1 Map Wake Tech Pedestrian Bridge Stream Repair Raleigh, Wake County, NC October 2021 (.XXXXXXX Impact Site 2: Temporary Stream Impacts: 30 LF Permanent Stream Impacts: 26 LF Temporary BZ1 Impacts: 630 sqft Temporary BZ2 Impacts: 252 sqft Permanent BZ1 Impacts: 1,324 sqft Permanent BZ2 Impacts: 558 sqft 0 20 Feet 40 Legend Temporary Constuction Access Stream Impacts Temporary Pump -Around Stream Impacts _- - Permanent No -Net Loss Stream Bank Stablization Streams Permanent Buffer Zone 1 Impacts Temporary Buffer Zone 1 Impacts cc Permanent Buffer Zone 2 Impacts Temporary Buffer Zone 2 Impacts Neuse River Buffer Zone 1 Neuse River Buffer Zone 2 Temporary Wetland Impacts Project Study Area Kimley>)Horn Figure 5.2: Impact Site 2 Map Wake Tech Pedestrian Bridge Stream Repair Raleigh, Wake County, NC October 2021 . 40 Feet 40 Impact Site 3: Temporary Stream Impacts: 45 LF Permanent Stream Impacts: 30 LF Temporary BZ1 Impacts: 787 sqft Temporary BZ2 Impacts: 724 sqft Permanent BZ1 Impacts: 1,697 sqft Permanent BZ2 Impacts: 834 sqft Legend Temporary Constuction Access Stream Impacts Temporary Pump -Around Stream Impacts •"•••^— Permanent No -Net Loss Stream Bank Stablization 0.— Streams Permanent Buffer Zone 1 Impacts Temporary Buffer Zone 1 Impacts Permanent Buffer Zone 2 Impacts Temporary Buffer Zone 2 Impacts Neuse River Buffer Zone 1 Neuse River Buffer Zone 2 Temporary Wetland Impacts Project Study Area Kimley>» Horn Figure 5.3: Impact Site 3 Map Wake Tech Pedestrian Bridge Stream Repair Raleigh, Wake County, NC October 2021