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HomeMy WebLinkAbout20231153 Ver 2_Shulls Mill Dam Removal PCN Submittal Package_20240105WILDLANDS ENGINEERING MEMORANDUM TO: Permit Reviewer FROM: Jake McLean, Wildlands Engineering DATE: January 5, 2024 RE: Pre -Construction Notification Pursuant to NWP 27 & 53 Shulls Mill Dam Removal Watauga County, North Carolina On behalf of MountainTrue, Wildlands Engineering, Inc. (Wildlands) is submitting a Pre -Construction Notification (PCN) for the Shulls Mill Dam Removal project in Watauga County near Boone, NC in the Watauga River Basin (HUC 06010103). MountainTrue has partnered with American Rivers and helped secure grant funding through a direct funding allocation from the State of NC, issued through the NC Wildlife Resources Commission, to complete the removal of Shulls Mill Dam for the purpose of aquatic habitat improvement along the Watauga River. Project activities for the dam removal phase of work are described in the PCN application and figures. Supporting Documentation Table of Contents Figure 1— USGS Topographic Map............................................................................................ 3 Figure2 —Vicinity Map..............................................................................................................4 Figure3 —Site Map.................................................................................................................... 5 Figure4—Soils Map..................................................................................................................6 Figure 5 —Aquatic Resources Impact Map................................................................................7 401 Pre -filing Meeting Request Email.......................................................................................8 PhotoLog................................................................................................................................. 10 Landowner Authorization Form.............................................................................................. 14 PJDForm..............................................................................................................................................17 NCDWQStream ID Form......................................................................................................... 21 Permit Authorization NWP 6 — Geotechnical Testing Phase ................................................... 23 NCSHPO Response Letter....................................................................................................... 29 USFWSCorrespondence.......................................................................................................... 31 Construction Memo and Plans................................................................................................36 Please do not hesitate to contact me at (828)545-3865 or at Imclean@wildlandseng.com should you have any questions. Sincerely, 4 Jake McLean, PE Project Manager Figures N N LL O O co O O M O H Z zLU W LLJ �Z Z �(D QZ W 4 q 0 v U C f6 N L � o Q o U Ln E Ct c7 ` n U GOr%`eLt�G RJ`' 0 Ad, 61 e C`Rds \I Qatar "d d y,q 4� r d � y �• c4 a� e a Sh10' 0 �0 - 000, �a 01as"uus Sot �c My6� yaa 'J d1 G lip Al G%a OtaQ` WY 11 ` Greek RV m Y A G� d T C U tin -0 a'J r,, 4d''n1s„r Q� -; _a 0 o z o o +=a0 c> > O O r-1 C� a ao�c� a LL 0 m 0o oC 3 R t to N 3 R N Lo O Lo N O 0 21am co can 0 U 0 0 0 E w w u A to to 0 0 0 -0 0 0 a) u a Q w w m cn 0 :3 > 0 0 -' E 0 R5, rz U- E -S M ca 2 to In C) m CL C y z 'o cn a o :3 c o v a ao o a ii E m � 0 �a m oc 3 � t � N 3 R R N N LL O O O O n Z z LU W �W Z Qz W m CL C y z o u a cn c m ,9 o � a V-1 o E'oo v o ° c E ,� a LA 3 LA Cr 3 m t bb Ln N om m w 3 Op ii O n Z z LU W �W Z Qz W 401 Pre -Filing Meeting Request Email From: 401PreFile To: Mimi Caddell Subject: Automatic reply: [External] 401/Buffer Pre -filing Meeting Request Date: Friday, November 3, 2023 10:07:05 AM This email confirms receipt of your pre -filing meeting request. Please retain this email for your records and submit this documentation as part of your 401 application (PCN Application) as required by federal law. DWR will not be able to accept your application without this federally required documentation. 401 applications received without documentation that a pre -filing meeting request was submitted at least 30 days prior will be returned as incomplete. Responses to this email are not monitored. If you need to contact 401/Buffer Permitting Staff, please use the following link(s) to access of staff contact list(s). For Non -Transportation Central Staff: https://deq.nc.gov/about/divisions/water-resources/water-quality_permitting/401-buffer- permitting/401-buffer-permitting-contacts For Non -Transportation Regional Staff: httl2s://edocs.deg.nc.gov/WaterResources/DocView.asl2x?dbid=0&id=2162034&cr=1 For all Transportation Projects Including NCDOT Projects: https://deq.nc.gov/about/divisions/water-resources/water-resources-permits/transportation- permitting/staff-contacts Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties by an authorized state official. Photo Log N�. x � �. 61,E F. :'.,y3- """4 � �,y q .✓ `t �M'� _ - ^ A � -n aw..''T34a.�► a� �i� - : � � � � ° x� 'ma's s, - _ .. �����'F •"� .. " � °per .'#_- - nE f '4 'tea `yam t y Photo point 1: UT1 start —view upstream Photo point 1: UT1 start — view downstream • • point towards confluencedownstream • • point @y upstreamr ,j-r? , 46, 1i 3_ N Photo point 5: Watauga River upstream Shulls Mill Dam —view Photo point 5: Watauga River upstream of Shulls Mill Dam — downstream I view downstream/left bank Photo point 5: Watauga River upstream of Shulls Mill Dam — view downstream/right channel bar Shulls Mill Dam Removal — Representative Site Photos (July 7t", 2023) Photo point 6: Side view of Shulls Mill Dam from the right bank Photo point 7: Watauga River downstream Shulls Mill Dam — view upstream Shulls Mill Dam Removal — Representative Site Photos (July 7t", 2023) Landowner Authorization Form LAND ACCESS LICENSE AGREEMENT THIS LAND ACCESS LICENSE AGREEMENT ("License Agreement") is by and between Hound Ears Club, Incorporated ("Licensor"), and American Rivers, Inc. ("Licensee"), ("the Parties"). WHEREAS, the Licensor is the owner of the property Shull's Mill Dam located at Old Shull's Mill Rd. WHEREAS, the Property contains Shull's Mill Dam; WHEREAS, the Licensor and the Licensee agree to dam removal for the purpose of, aquatic habitat improvement WHEREAS, the Licensee has requested access to the Property for the purpose of dam removal and stream restoration (the "Work"); NOW THEREFORE, in consideration of the mutual premises, promises and covenants, that are hereby acknowledged by the parties, the parties agree as follows: 1. Licensor grants to Licensee, its employees, representatives, contractors, and subcontractors, including but not limited to MountainTrue, Blue Ridge Resource Conservation and Development Council ("Project Partners") the right to access the Property at all reasonable times for the purpose of performing the Work. 2. This License Agreement shall commence on the date that it is fully executed by the Parties and shall continue until Licensee completes the Work, but no later than December 31, 2025. The rights granted by this License are specifically designed to inure to the benefit of the Licensee and its contractors, subcontractors, employees and representatives, including the Project Partners. 3. The Licensor and the Licensee agree that this License Agreement does not convey any right, title, easement or interest of a permanent nature in the Property to the Licensee or any other person. The Licensor and Licensee agree that this License Agreement does not waive other rights either party may have under federal, state, and local law. 4. Upon termination of the Work, Licensee shall restore any portions of the Property disturbed by the Work, as set forth in a detailed site plan to be provided at a later date, with the understanding that the Dams will have been removed and associated habitat restoration activities will have been completed. 5. Licensee shall, at its own cost and expense, maintain and keep in force at all times during the License Period: (1) commercial general liability insurance, which shall include contractual liability coverage against third -party claims for bodily injury or property damage occurring on the Property as a result of Licensee or Project Partners' Work; primary coverage will be a minimum aggregate limit of not less than $1,000,000 and excess umbrella aggregate limit of not less than $2,000,000; and (2) Employers' Liability and Workers' Compensation Insurance to the extent required by law. 6. Licensee accepts the condition of the Property "as is" and acknowledges that Licensor has not made and makes no warranty of any kind as to the condition of the Property for the use intended under this License. 7. Licensee assumes no liability for any existing or future environmental conditions of the Property. Licensor indemnifies and holds harmless Licensee for any pollutants, hazardous materials and/or substances on the Property from acts or omissions of Licensor and/or past owners, operators, or tenants of the Property, and acts or omissions of any transporters and/or arrangers of any pollutants, hazardous materials and/or substances on the Property, which may be disturbed as a result of the Work. Licensee agrees to notify Licensor of any such pollutants, hazardous materials and/or substances discovered on the Property in accordance with, or as a result of, the Work. The Licensor's obligations under this section shall survive the termination of this License Agreement. 8. Neither party shall be liable to the other for any liability for consequential, special or incidental damages including, without limitation, any damages arising out of business interruption, lost profits, loss of rental income, or loss of the use of the Property whether any such claim is brought by Licensor, Licensor's tenants or any other third party. 9. This License Agreement shall be governed and construed under and in accordance with the laws of the State of North Carolina 10. This License Agreement constitutes the entire agreement by and between the parties hereto and no other oral or written agreements, arrangements, representations or understandings, unless specifically noted herein, shall be deemed to be in existence. This License Agreement, for all purposes, supersedes all prior agreements, written or oral, if any, between the parties hereto, and may not be amended or modified except by an instrument in writing signed by all parties to be bound. 11. The license granted hereby is personal to Licensee and shall not be assigned or sub -licensed without the prior written consent of Licensor. Licensor shall transfer the rights and obligations of this License Agreement to any successors, heirs, executors, lessees, or assigns of the Property for the remainder of the License Period, including but not limited to the remainder of Work to be completed by Licensee and its Project Partners. This Agreement shall be binding upon the parties hereto, and their respective successors and assigns. Any Notices under this License Agreement shall be deemed duly delivered if hand -delivered or mailed by U.S. certified mail, return receipt requested, to: Licensor: Hound Ears Club, Incorporated +28 Shull's Mill Roved Boone NC' 28h07 Attn: Licensee: American Rivers Attn: AR Erin McCombs With a copy to: American Rivers, Inc. ATTN: General Counsel 1101 14., St., NW Suite 1400 Washington, DC 20005 IN WITNESS WHEREOF, the Licensor and Licensee have executed this License Agreement as of the day and the year first set forth above. Witness: t� Witness: By: Date: L 2 ' 15- — Z G 21 AMERICAN RIVERS, INC. By.: 12/17/21 Kristin M. May, Chief Financial Officer pJD Form O.PRELIMINARY JURISDICTIONAL DETERMINATION (PJD) FORM BACKGROUND INFORMATION A. REPORT COMPLETION DATE FOR PJD: 8/11/2023 B. NAME AND ADDRESS OF PERSON REQUESTING PJD: Wildlands Engineering, Inc., Mimi Caddell, 167-B Haywood Road, Asheville, NC 28806 C. DISTRICT OFFICE, FILE NAME, AND NUMBER: Asheville Regulatory Field Office, Not filed to date D. PROJECT LOCATION(S) AND BACKGROUND INFORMATION: 1589 Dogwood, Boone, NC 28607 (USE THE TABLE BELOW TO DOCUMENT MULTIPLE AQUATIC RESOURCES AND/OR AQUATIC RESOURCES AT DIFFERENT SITES) State: North Carolina County: Watauga City: Boone Center coordinates of site (lat/long in degree decimal format): Latitude: 36.1815716 Longitude:-81.7467913 Universal Transverse Mercator: UTM 17 Name of nearest waterbody: Watauga River E. REVIEW PERFORMED FOR SITE EVALUATION (CHECK ALL THAT APPLY): ❑ Office (Desk) Determination. Date: ® Field Determination. Date(s): 7/06/23 TABLE OF AQUATIC RESOURCES IN REVIEW AREA WHICH "MAYBE" SUBJECT TO REGULATORY JURISDICTION. Estimated amount Type of aquatic Geographic authority Latitude Longitude of aquatic resources resources (i.e., wetland to which the aquatic Site Number (decimal (decimal in review area vs. non -wetland resource "may be" degrees) degrees) (acreage and linear waters) subject (i.e., Section feet, if applicable 404 or Section 10/404) 1. Watauga 36.1815716 -81.7467913 1051 LF Non -wetland waters Section 404 River 2. UT1 36.1825860 -81.7472150 107 LF Non -wetland waters Section 404 1) The Corps of Engineers believes that there may be jurisdictional aquatic resources in the review area, and the requestor of this PJD is hereby advised of his or her option to request and obtain an approved JD (AJD) for that review area based on an informed decision after having discussed the various types of JDs and their characteristics and circumstances when they may be appropriate. 2) In any circumstance where a permit applicant obtains an individual permit, or a Nationwide General Permit (NWT) or other general permit verification requiring "pre- construction notification" (PCN), or requests verification for a non - reporting NWP or other general permit, and the permit applicant has not requested an AJD for the activity, the permit applicant is hereby made aware that: (1) the permit applicant has elected to seek a permit authorization based on a PJD, which does not make an official determination of jurisdictional aquatic resources; (2) the applicant has the option to request an AID before accepting the terms and conditions of the permit authorization, and that basing a permit authorization on an AJD could possibly result in less compensatory mitigation being required or different special conditions; (3) the applicant has the right to request an individual permit rather than accepting the terms and conditions of the NWP or other general permit authorization; (4) the applicant can accept a permit authorization and thereby agree to comply with all the terms and conditions of that permit, including whatever mitigation requirements the Corps has determined to be necessary; (5) undertaking any activity in reliance upon the subject permit authorization without requesting an AJD constitutes the applicant's acceptance of the use of the PJD; (6) accepting a permit authorization (e.g., signing a proffered individual permit) or undertaking any activity in reliance on any form of Corps permit authorization based on a PJD constitutes agreement that all aquatic resources in the review area affected in any way by that activity will be treated as jurisdictional, and waives any challenge to such jurisdiction in any administrative or judicial compliance or enforcement action, or in any administrative appeal or in any Federal court; and (7) whether the applicant elects to use either an AJD or a PJD, the JD will be processed as soon as practicable. Further, an AJD, a proffered individual permit (and all terms and conditions contained therein), or individual permit denial can be administratively appealed pursuant to 33 C.F.R. Part 331. If, during an administrative appeal, it becomes appropriate to make an official determination whether geographic jurisdiction exists over aquatic resources in the review area, or to provide an official delineation of jurisdictional aquatic resources in the review area, the Corps will provide an AJD to accomplish that result, as soon as is practicable. This PJD finds that there "may be" waters of the U.S. and/or that there "may be" navigable waters of the U.S. on the subject review area, and identifies all aquatic features in the review area that could be affected by the proposed activity, based on the following information: SUPPORTING DATA. Data reviewed for PJD (check all that apply) Checked items should be included in subject file. Appropriately reference sources below where indicated for all checked items: ® Maps, plans, plots or plat submitted by or on behalf of the PJD requestor: Map: USGS Topographic, Vicinity, Site Map with 2022 Aerial, Soils Map ® Data sheets prepared/submitted by or on behalf of the PJD requestor. ❑ Office concurs with data sheets/delineation report. ❑ Office does not concur with data sheets/delineation report. Rationale: ❑ Data sheets prepared by the Corps: ❑ Corps navigable waters' study: ❑ U.S. Geological Survey Hydrologic Atlas: ❑ USGS NHD data. ❑ USGS 8 and 12 digit HUC maps. ® U. S. Geological Survey map(s). Cite scale & quad name: 1:24,000 Scale Boone and Valle Crucis. NC quadrangles ® Natural Resources Conservation Service Soil Survey. Citation: NRCS Web Soils Survey Website ❑ National wetlands inventory map(s). Cite name: ❑ State/local wetland inventory map(s): ® FEMA/FIRM maps: Zone AE — FIRM 3710188900J ❑ 100-year Floodplain Elevation is: (National Geodetic Vertical Datum of 1929) ® Photographs: ®Aerial (Name & Date): 2022 aerial is used on GIS figures with submittal or ®Other (Name & Date): Representative site photos with submittal. ❑ Previous determination(s). File no. and date of response letter: ❑ Other information (please specify): IMPORTANT NOTE: The information recorded on this form has not necessarily been verified by the Corps and should not be relied upon for later jurisdictional determinations. Mimi Caddell A*V (�a& Signature and date of Regulatory 8/11/2023 staff member completing PJD Signature and date of person requesting PJD (REQUIRED, unless obtaining the signature is DATE impracticable) 1 Districts may establish timeframes for requester to return signed PJD forms. If the requester does not respond within the established time frame, the district may presume concurrence and no additional follow up is necessary prior to finalizing an action. NCDWQ Stream ID Form NC DNVQ Stream identification Form Version 4.11 y 11 Latitude: p � � �Z�J p�o 0 Date: � 1 b ZO�' j projectl5ite: County: rJ �-1r A Lkk C7l V Longitude: Evaluator, iM C p, a 6 e 0 , Total Points: (� stream is at least intermittent 5 stream Determination icircl a Ephemeral Intermittent erennia Other U-T l e.g Quad Name: if >- 19 or perennial if :' 30' U p'L A. Geomorphology Subtotal = Absent Weak Moderate Strong 1" Continuity bed and bank 0 12 Sinuosity nnel along thalweg 02. 3 3. In -channel structure: ex. riffle -pool, step -pool, 0 1 2 ripple -pool sequence 0 1 2 4. Particle size of stream substrate 2 3 5. Activelrelict floodplain 0 2 3 6. Depositional bars or benches 0 1 3 7. Recent alluvial deposits 0 1 2 3 8. Headcuts 0 0.5 1 1.5 9. Grade control 0 0.5 1 1.5 10. Natural valley Yes = 3 11. Second or greater order channel o =75 artifidaI ditches are not rated: see discussions in manual B, Hydrology Subtotal = 16 12. Presence of Baseflow 0 1 2 3 13. Iron oxidizing bacteria 0 2 0.5 0 14, Leaf litter 5 0 1 0.5 1 1.5 15. Sediment on plants or debris 1.5 16, Organic debris lines or piles 0 0.5 1 17, Soil -based evidence of high water table? No = 0 es C. Biology (Subtotal = 11JL ) 18. Fibrous roots in streambed 3 2 1 0 0 19. Rooted upland plants in streambed 2 1 20. Macrobenthos (note diversity and abundance) 0 1 QZ> 2 3 21. Aquatic Mollusks 0 1 0.5 1 1.5 22, Fish 0.5 1 1.5 23. Crayfish ES E25. 0.5 1 1.5 24. Amphibians 0 0.5 1 1.5 Algae 26. Wetland plants in streambed ACW = 0.7 OBL = 1.5 Other = 0 (u 'perennial streams may also be identified using other methods. See p. 35 of manual. �v 112 C"& t Sketch: 47 _ LT �Id Shxt�S ��t R d. �r Permit Authorization NWP 6 — Geotechnical Testing Phase U.S. ARMY CORPS OF ENGINEERS WILMINGTON DISTRICT Action ID. 2023-01660 County: Watauga GENERAL PERNHT (REGIONAL AND NATIONWIDE) VERIFICATION Permittee: Mountain True / Attn: Bob Wagner Address: 164 Depot Street Boone, NC 28607 Telephone Number: 828-545-3865 Location description: The site is located at/near the intersection of NC Hwy 105 and Old Shulls Mill Road, at the site of the existing Shulls Mill Dam on the Watauga River, near Boone, NC. Coordinates are: 36.182806-81.747215. Description of projects area and activity: This permit authorizes geotechnical testing associated with the proposed Shull Mill Dam removal nroiect. Temnorary impacts authorized by this nermit consist of annroximatelv 13 test nits (maximum) throughout a 450-foot section of the Watauga River immediately upstream of the existing dam. Please reference the attached letter from the North Carolina Wildlife Resource Commission regarding recommendations for our consideration. Applicable Law: ® Section 404 (Clean Water Act, 33 USC 1344) ❑ Section 10 (Rivers and Harbors Act, 33 USC 403) Authorization: Regional General Permit Number or Nationwide Permit Number: NWP #6 SEE ATTACHED RGP or NWP GENERAL, REGIONAL AND SPECIAL CONDITIONS Your work is authorized by the above referenced permit provided it is accomplished in strict accordance with the attached conditions, above noted special conditions, and your submitted application and attached information dated August 16, 2023. Any violation of the attached conditions or deviation from your submitted plans may subject the permittee to a stop work order, a restoration order, a Class I administrative penalty, and/or appropriate legal action. This verification will remain valid until the expiration date identified below unless the nationwide/regional authorization is modified, suspended or revoked. If, prior to the expiration date identified below, the nationwide/regional permit authorization is reissued and/or modified, this verification will remain valid until the expiration date identified below, provided it complies with all requirements of the modified nationwide/regional permit. If the nationwide/regional permit authorization expires or is suspended, revoked, or is modified, such that the activity would no longer comply with the terms and conditions of the nationwide/regional permit, activities which have commenced (i.e., are under construction) or are under contract to commence in reliance upon the nationwide/regional permit, will remain authorized provided the activity is completed within twelve months of the date of the nationwide/regional permit's expiration, modification or revocation, unless discretionary authority has been exercised on a case -by -case basis to modify, suspend or revoke the authorization. Activities subject to Section 404 (as indicated above) may also require an individual Section 401 Water Quality Certification. You should contact the NC Division of Water Resources (telephone 919-807-6300) to determine Section 401 requirements. For activities occurring within the twenty coastal counties subject to regulation under the Coastal Area Management Act (CAMA), prior to beginning work you must contact the N.C. Division of Coastal Management at (252) 808-2808. This Department of the Army verification does not relieve the permittee of the responsibility to obtain any other required Federal, State or local approvals/permits. If there are any questions regarding this verification, any of the conditions of the Permit, or the Corps of Engineers regulatory program, please contact Amanda Jones at 828-271-7980, ext. 4225 or amanda.j ones@us ace.army.mil. 04-01-- Corps Regulatory Official: Date: September 20, 2023 Amany Jones Expiration Date of Verification: March 14, 2026 CF: Wildlands Engineering, Attn: Jake McLean (via email) Action ID Number: 2023-01660 County: Watauga Permittee: Mountain True / Attn: Bob Wagner Project Name: Shulls Mill Dam Removal GeoTech Testing / NWP 96 Date Verification Issued: September 20, 2023 Project Manager: Amanda Jones Upon completion of the activity authorized by this permit and any mitigation required by the permit, sign this certification and return it to the following address: US ARMY CORPS OF ENGINEERS WILMINGTON DISTRICT Attn.: Amanda Jones 151 Patton Avenue, Room 208 Asheville, North Carolina 28801-5006 Please note that your permitted activity is subject to a compliance inspection by a U. S. Army Corps of Engineers representative. Failure to comply with any terms or conditions of this authorization may result in the Corps suspending, modifying or revoking the authorization and/or issuing a Class I administrative penalty, or initiating other appropriate legal action. I hereby certify that the work authorized by the above referenced permit has been completed in accordance with the terms and condition of the said permit, and required mitigation was completed in accordance with the permit conditions. Signature of Permittee Date The Wilmington District is committed to providing the highest level of support to the public. To help us ensure we continue to do so, please complete our Customer Satisfaction Survey, located online at htt)s://regulatory.oi)s.usacc.army.mil/customer-service-survcv/ CL to -- z 0 0 m ~ 0 E o 0 a a 0 C3) Ln a r a 3 Co LL N > �O p� a m _ ao R 3 > f6 O N OC E m 0 3 t N N N LL O O O LO ® North Carolina Wildlife Resources Commission Cameron Ingram, Executive Director September 20, 2023 Ms. Amanda Fuemmeler U.S. Army Corps of Engineers, Regulatory Branch 151 Patton Avenue, Room 208 Asheville, North Carolina 28801-5006 SUBJECT: Shulls Mill Dam Removal — Geotechnical Testing Phase Watauga River, Watauga County Dear Ms. Fuemmeler: Biologists with the North Carolina Wildlife Resources Commission (NCWRC) reviewed an application to conduct geotechnical testing in the bed of the Watauga River, temporarily impacting up to 227 ft of stream in Watauga County. Our comments on this application are offered for your consideration under provisions of the Clean Water Act of 1977 (33 U.S.C. 466 et. seq.) and Fish and Wildlife Coordination Act (48 Stat. 401, as amended; 16 U.S.C. 661- 667d). Project activities should not impact wild trout, and a trout moratorium is not needed for the project. However, the Watauga River is part of the Watauga River Aquatic Habitat, a NC Natural Heritage Program natural area rated Very High due to the richness and ecological importance of the aquatic community. Most importantly, the Eastern Hellbender (Cryptobranchus alleganiensis, US Federal Species of Concern, NC Special Concern) is present just downstream of the dam. Effective erosion and sediment control on the project is extremely important to protect habitat for this species. The project proposes to access the river to dig up to 13 test pits on dry cobble bars and within the wetted channel; these pits could be up to 10 ft in width and depth. NCWRC met with Wildlands Engineering staff on August 11, 2023 to coordinate on methods and minimization of impacts to aquatic habitat. Where pits will be dug in the wetted channel, work areas will be isolated from flows with gravel/cobble or bladder flow diversion dams. Machine tracking within the channel will be minimized. Work is anticipated to take one day during this fall. Mailing Address: Habitat Conservation • 1721 Mail Service Center • Raleigh, NC 27699-1721 Telephone: (919) 707-0220 • Fax: (919) 707-0028 Shulls Mill Dam — Geotechnical Phase Page 2 20 September, 2023 Watauga River, Watauga Co We offer the following recommendations to minimize impacts to the aquatic community: 1. In -channel work should be accomplished as quickly as possible and vigilance used in sediment and erosion control during site preparation, construction, and clean up. Disturbed areas should be seeded, mulched and/or matted as soon as possible, preferably at the end of each work day. 2. Any erosion control matting used should be free of plastic mesh, as this type of mesh netting frequently entangles wildlife and is slow to degrade, resulting in a hazard that may last for years. 3. NCWRC staff would like to be present during the work. Please coordinate with Andrea Leslie, providing at least 2 weeks of notice of the work. Thank you for the opportunity to review and comment on this project. Please contact meat (828) 400-4223 if you have any questions about these comments. Sincerely, Andrea Leslie Mountain Region Coordinator, Habitat Conservation Program ec: Mimi Caddell, Wildlands Engineering Seren Homer, NC Division of Water Resources NC SHPO Response Letter North Carolina Department of Natural and Cultural Resources State Historic Preservation Office Ramona M. Bartos, Administrator Governor Roy Cooper Secretary D. Reid Wilson January 2, 2024 Office of Archives and History Deputy Secretary, Darin J. Waters, Ph.D. Julie Bernstorf jbemstod@wildlandseng.com Wildlands Engineering, Inc. 167-B Haywood Road Asheville, NC 28806 Re: Remove Shull Mill Dam, Watauga River, Watauga County, ER 23-2584 Dear Ms. Bernstorf: Thank you for your letter of November 10, 2023, regarding the above -referenced undertaking. We have reviewed the submission and offer the following comments. We have conducted a review of the project and are aware of no historic resources which would be affected by the project. Therefore, we have no comment on the project as proposed. The above comments are made pursuant to Section 106 of the National Historic Preservation Act and the Advisory Council on Historic Preservation's Regulations for Compliance with Section 106 codified at 36 CFR Part 800. Thank you for your cooperation and consideration. If you have questions concerning the above comment, contact Renee Gledhill -Earley, environmental review coordinator, at 919-814-6579 or environmental.reviewgdncr.nc.gov. In all future communication concerning this project, please cite the above referenced tracking number. (1� Sincerely, Ramona Bartos, Deputy State Historic Preservation Officer Location: 109 East Jones Street, Raleigh NC 27601 Mailing Address: 4617 Mail Service Center, Raleigh NC 27699-4617 Telephone/Fax: (919) 814-6570/814-6898 USFWS Correspondence From: Hamstead, Byron A To: Mimi Caddell Cc: Leslie. Andrea J Subject: Re: [EXTERNAL] Shulls Mill Dam Removal Project Date: Friday, January 5, 2024 8:38:33 AM Happy new year Mimi, Andrea and I spoke briefly about this project yesterday. We offer the following comments in response to your scoping request. These comments may also inform prudent species effect determinations from the action agency pursuant to Section 7 of the Endangered Species Act (ESA): General Comments The Service acknowledges that the North Carolina Wildlife Resources Commission (NCWRC) is an invested project proponent and we support the ecologically safe removal of the breached Shulls Mill Dam to improve aquatic organism passage. Our office is committed to support the conservation of federal trust resources and also conservation goals for State -priority species. NCWRC's conservation objectives for this project may also inform site -specific impact avoidance and/or minimization measures for federally protected species. We understand that a design has not been completed for the proposed project. Final project design and construction methods should also inform site -specific impact avoidance and/or minimization measures, effect determinations to federally listed species, and ultimately our concurrence. In accordance with the ESA, it is the responsibility of the appropriate federal action agency or its designated representative to review its activities or programs and to identify any such activities or programs that may affect endangered or threatened species or their habitats. If it is determined that the proposed activity is likely to adversely affect any species federally listed as endangered or threatened, formal consultation with this office must be initiated. Our concurrence with "no effect" determinations from action agencies is not required. Bats The information provided indicates that suitable forage, roosting, and/or commuting habitat occurs within the proposed action area (50CFR 402.02) for the federally endangered gray bat (Myotis grisescens), Virginia big -eared bat (Corynorhinus (=Plecotus) townsendii virginianus), Northern long-eared bat (Myotis septentriona(is, NLEB), and the proposed endangered tricolored bat (Perimyotis subf(avus, TCB). Multiple known occurrences of the species above occur in the project vicinity. Your correspondence also indicates that no caves or cave -like features are present within the proposed action area which would provide suitable hibernacula for the bat species above. However, it is plausible or likely that the bat species above forage, commute, or roost in forested portions of the action area or culverts that occur onsite. We acknowledge that no bats were detected during July 6, 2023 surveys conducted by Wildlands Engineering. But the methods and scope of these surveys are uncertain. Please refer to the Range -Wide Survey Guidelines for NLEB, TCB, and Indiana bat for conducting presence/absence surveys: https://www.fws.gov/library/collections/range-wide-indiana-bat- and-northern-long-eared-bat-surveyguidelines. In lieu of valid bat survey results, project proponents may assume presence of these species where their suitable habitats occur and identify measures to reduce the probability of take. The information provided indicates that 10-20 trees 3-inches DBH or greater may be removed during the active season for tree -roosting bats (April 1 - November 15) for staging and grading. The project would also entail percussive activities during a one -month period between May 2024 and August 2024, but the timing, duration, and magnitude of those impacts to listed bats is uncertain. We encourage project proponents to accomplish all necessary tree clearing before April 1, 2024 (during the inactive season for tree -roosting bats) to minimize impacts to these species. Minimizing or avoiding percussive activities during the active season for tree - roosting bats and especially their pup season (May 15 - July 31) would also reduce impacts to these species. We believe these impact minimization measures would reduce the probability for take of the species above to a level that is insignificant and/or discountable, and would warrant our concurrence with "may affect, not likely to adversely affect" determinations from the action agency for the bat species above. Although TCB is not currently afforded protections under Section 7 of the ESA, these impact minimization measures would support our concurrence with a "may affect, not likely to adversely affect" determination for this species should it become listed before the project is complete. Aquatic Species The proposed threatened green floater (Lasmigona subviridis) may occur in this reach of the Watauga River. A final listing decision for this animal has not been issued and it is not currently subject to consultation requirements under Section 7 of the ESA. We appreciate your consideration for this species and acknowledge that your survey efforts on July 6, 2023 did not detect evidence for this species at that time. Like most aquatic sessile filter -feeding animals, this freshwater mussel is sensitive to perturbations in water quality and physical habitats. We encourage stringent pollution prevention measures, sediment controls, and a project design/construction sequence that minimizes impacts to aquatic habitats within the Watauga River. A population of eastern hellbender (Cryptobranchus alleganiensis a((eganiensis) occurs in this reach of the Watauga River. The Service was petitioned to list this species as threatened on March 31, 2022. The Service has not made a petition finding at this time and this population is not currently subject to consultation requirements under Section 7 of the ESA. The eastern hellbender is State -listed as Special Concern. In North Carolina, the breeding season for this animal is August 15 - November 30. We encourage project proponents to avoid and/or minimize impacts to suitable habitats for these animals, especially during their breeding season. The Service also encourages a project design that incorporates nesting shelters for this animal. The measures to protect green floater would also minimize impacts to this species. Bald Eaale and Other Federally Listed Species Recent records for bald eagle (Haliaeetus leucocephalus) occur in the project vicinity. However, we acknowledge that your surveys conducted July 6, 2023 did not detect evidence for bald eagle nests within the proposed action area. We acknowledge your findings that suitable habitat does not occur within the action area for any other federally listed species. Thanks for your coordination. Please contact me with any questions. Regards, Byron Byron Hamstead (he/him) Fish and Wildlife Biologist U.S. Fish and Wildlife Service Asheville Ecological Services Field Office 160 Zillicoa Street Asheville, North Carolina, 28801 This email correspondence and any attachments to and from this sender is subject to the Freedom of Information Act and may be disclosed to third parties. From: Hamstead, Byron A <byron_hamstead@fws.gov> Sent: Friday, December 8, 2023 2:51 PM To: Mimi Caddell <mcaddelI@wildlandseng.com> Subject: Re: [EXTERNAL] Shulls Mill Dam Removal Project Thanks Mimi, We have added this request to our list and will respond within 30d. Warm regards, Byron Byron Hamstead (he/him) Fish and Wildlife Biologist U.S. Fish and Wildlife Service Asheville Ecological Services Field Office 160 Zillicoa Street Asheville, North Carolina, 28801 This email correspondence and any attachments to and from this sender is subject to the Freedom of Information Act and may be disclosed to third parties. From: Mimi Caddell <mcaddelI@wildlandseng.com> Sent: Friday, December 8, 2023 2:44 PM To: Hamstead, Byron A <byron_hamstead@fws.gov> Subject: [EXTERNAL] Shulls Mill Dam Removal Project This email has been received from outside of DOI - Use caution before clicking on links, opening attachments, or responding. Hi Byron, Hope all is well with you. In regards to the dam removal phase of the Shulls Mill Dam Removal Project (IPaC Project Code: 2024-0021440), see attached for the scoping letter along with map figures, species conclusion table, IPaC species list, NLEB consistency letter, and NCNHP letter. Please let me know if you have any questions or need additional information. Thanks, Mimi Caddell I Environmental Scientist 704.222.4918 Wildlands Engineering. Inc. 167-B Haywood Road Asheville, NC 28806 Construction Memo and Plans Technical Memorandum Prepared for: MountainTrue Project Title: Shulls Mill Dam Removal Wildlands 005-50002 Project No: Subject: 90% Design Plans and Permitting Package (DRAFT) Date: January 4, 2024 From: Jacob McLean, PE, CFM, Project Manager Julie Bernstorf, PE, Design Engineer Figure 1. Project Site Map Appendices: Appendix B. Project Plans - Permitting Set Appendix C. Photo Log ,\A CARO��*,�. 2 SEAL l. 033578 '*',Oe ► o,,`,• Wildlands Engineering, Inc. License F-0831 W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum INTRODUCTION / OVERVIEW A restoration project is proposed to remove Shulls Mill Dam and restore the river plan, profile and cross - sectional dimension in the historically impounded reach. The goals of the project are to restore riverine continuity with respect to hydrology, sediment transport and habitat connectivity. This will be accomplished through the full vertical and horizontal removal of the Shulls Mill Dam, except along the left floodplain portion left of the current channel. In this area, only the upper half of the dam is proposed to be removed —the lower portion will help to contain and retain fine deposition from future high flows. The project will restore the river channel and bank through the historically impoundment area to address ongoing erosion and facilitate a trend towards long-term geomorphic equilibrium by lowering the stream to the predicted post -removal base level through the removal of excess deposited sediment behind the dam. The proposed removal and restoration activities will facilitate aquatic organism passage and provide water quality benefits by reducing riverbank erosion. The dam removal will also address safety concerns associated with unauthorized swimming and diving at the dam and enable safe passage for paddlers. Preliminary construction plans are provided in Appendix A. The Shulls Mill Dam is located in Watauga County (36' 11' 03.48" N, 81' 44' 49.59" W) near the intersection of Hwy 105 and Old Shulls Mill Road and upstream of the community of Valle Crucis. A photo log of site conditions is provided in Appendix B. The dam is a significant barrier on the Watauga River and a prior removal project downstream removed the Ward Mill Dam and has successfully restored connectivity from the lower river below the Rominger Road bridge. Land use directly adjacent to the dam and impoundment is residential to the east and road and highway to the west with some commercial and residential parcels in close proximity (Figure 1). A narrow, wooded river corridor and steep valley walls characterize the site. At the Dam, the Watauga River has a drainage area of 25.8 square miles. The dam was previously breached. The primary (high flow) breach is located along the right valley wall where the dam has washed out and only the foundation remnants remain. High flows follow this flow path through a rocky area and the removal of the dam will significantly reduce the frequency and velocity of high flows in this area. Three holes are also present in the face of the dam that provide low flow conveyance and control the existing upstream water surface (and sediment levels in the river channel). There is a drop of approximately 3' through the dam at base flow from the upstream river channel (2861.6') into the downstream pool (2858.6'). The historic impoundment has been re-established since the breach openings were established with riffles and pools having formed at the current bed level. The removal of the dam is anticipated to lower the base level, upstream of the dam up to the location of a bedrock outcropping in the riverbed, by an average of 3'. Plans are being made to remove the sediment prior to removal of the dam structure in order to prevent a slug of sediment from entering the downstream reach where a known breeding population of Eastern Hellbender (Cryptobranchus alleganiensis) reside and have been identified by NC WRC as an important resource to protect from potential impacts. Based on best available information, the original dam on this site was constructed in the early 1900's. It was significantly impacted by the 1940 flood and was never fully reestablished for its original purpose. The original dam had a powerhouse on river left and a railroad corridor on river right, both of which are no longer present. The dam is approximately 175 feet long with a maximum height of 20-22 feet from the bedrock base to the top of the dam and a uniform thickness of approximately 18" at the top. The base of the dam may taper to a width of approximately 5'. The dam appears to consist of an upper wall and lower wall poured separately, with the lower wall anticipated to taper to a broader base, as stated. The owner of the Shulls Mill Dam is the Hound Ears Country Club. The Club has signed an agreement with MountainTrue and American Rivers to allow for removal of the dam and associated permitting. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum PURPOSE OF MEMO The purpose of this memorandum (memo) is to summarize the assessment, design and stakeholder outreach work leading up to the 90% design permitting plans that provide details for the removal of Shulls Mill Dam and associated sediment mitigation and river restoration work. The memo will also provide support and justification that the proposed approach meets regulatory requirements, design goals and is adequately protective of the downstream hellbender population. The preparation of the permitting plans and package involved assessment, design, and hydraulic modeling activities to develop data to support the construction approach presented. All references to the left or right bank within documentation follow a downstream -facing convention. INITIAL ASSESSMENT Assessment fieldwork was conducted fall 2023 and included geologic site review, geomorphic evaluation, and vegetation assessment. Geologic Site Review A geologic review of hillslope processes influencing the site was performed by Appalachian Landslide Consultants (ALC). ALC reviewed QL1 LiDAR (lidar) topographic data and completed field visits to verify lidar interpretation of hillslope geology and historic depositional features on the landscape. ALC also oversaw geotechnical investigations involving test pits for evaluating subsurface site conditions. ALC's review indicates that the left valley hillslope processes funnel colluvial material along concave landforms to areas above and below the historic impoundment and that areas within the impoundment are largely protected by a convex upslope landform. This accounts for the lack of boulder and colluvial material observed within the historic impoundment during visual and geotechnical testing efforts. The right hillslope is not as steep and no direct pathways for colluvium were present within the historic impoundment reach. However, at and below the dam, hillslope processes have contributed to the right floodplain and terrace boulder field. Also notable, bedrock outcroppings were observed consistently along the right bank at and immediately above the existing base flow elevation. During geotechnical exploration, bedrock was only encountered below the existing riverbed at the upstream limits of the proposed river restoration reach. Bedrock is also visible on the right limits of the dam face on the downstream side. No boulders were encountered during geotechnical test pits. ALC also provided drone photography within the historic impoundment to help evaluate site conditions; some of these photographs are included in Appendix B. Geomorphic Evaluation and Design Stream geomorphologic evaluation was completed within the historic impoundment and upstream and downstream reaches, which are also in a confined valley setting. As previously discussed, the impoundment has been breached a long time and base flow stream channel and flood flow pathways have formed based on the current condition. Base flow is controlled by the elevations at breached areas through the holes in the dam face and by the elevation and material present along the right floodplain side of the dam. It is expected that repeated flood flows have caused considerable scour of finer material from the right floodplain as all of the river's energy is focused on that area during high flows under the existing conditions. Post -removal conditions will allow for this area to return to a lower velocity area as high flows will be centered in the valley and the highest velocity vectors will align with the existing pool. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum The influence of the historic impoundment was evaluated for its role in current conditions. Based on soil probes, the left bank of the river is fine silt likely deposited during the era of full impoundment behind the dam. Terrace levels off the left top of bank are consistent with the approximate top of the dam elevation. The right bank has several bedrock outcroppings low on the channel bank, particularly in the upper half of the historic impoundment. At a higher level, a small and flat depositional surface is consistent with the right bank elevation, which suggests the full impoundment level. In the river channel, two significant mid -channel bars have formed between the dam and the bedrock outcropping in the upstream limits of the historically impounded reach. As a result, the bottom width of the river has become excessively wide with flow braiding around the backside of the bars and into the fine sediment on the left bank. It is estimated from a comparison of 2017 LiDAR to the 2023 survey that the size of these mid -channel bars has expanded and left bank erosion has resulted in approximately 1,000 CY of sediment loss and downstream transport over the approximate 6-year period. This estimate was developed by subtracting the project topographic survey from the 2017 LiDAR topography and discounting the area below the water surface that is not accurately surveyed by LiDAR. Convex landform upstream through impounded area Ft Shulls Mill Dam �`'I V "'V M,Concave landform leading to right floodplain downstream of dam in proposed rock harvesting area j t l Concave landform ' r _ upslope of upstream - Ir grade control Convex Landform above the historic impoundment influences river morphology through restoration area The river restoration project proposes to narrow the base and bankfull flow channels. A geomorphic evaluation was completed on upstream and downstream areas of the river to locate suitable reference reach data that could guide restoration design. Based on the site geology and stable bedform W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum downstream of the dam (head of riffle) and upstream (rock/boulder ledge just above project limits) , the historically impounded reach is judged to have been a flatter area as compared to the steep gradients farther upstream and downstream. The predicted slope through this reach is at or less than 1% whereas #' adjacent areas exceed 3-5% over similar channel lengths. In steeper ;. areas, and even in some flatter areas with more colluvial influence, higher base flow widths are broken up by large colluvial materials across the channel section. No colluvial materials were found during geotechnical testing (test pits) completed within the historic impoundment. The most comparable reach was found downstream about 3500 feet near the Hwy 105 bridge. In this reach, where slopes were comparable to the historic impoundment reach, the bottom width was measured from UDAR and aerial data sources and found to vary from 40'-45'. Based on this and other measurements taken to bracket the range of low flow channel widths, the design bottom width was set at 43'. The Watauga River at the project site has a drainage area of 25.8 square miles based on USGS StreamStats v4.2.0 Aerial photography shows the distinct difference in material upstream and downstream of the (https://streamstats.usgs.gov/ss/). Regional curve data is available for historically impounded segment Western North Carolina (https:Hweb.a rchive.org/web/20170705004307/https://www. bae.ncsu.edu/programs/extension/wqg/srp/mtntable.htm I). The following bankfull geometry predictions and design values were developed for the site using equations from this regional curve data and local flow and geometry estimates: W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum Table 1. Results of Regional Curve Hydraulic Geometry Relationships for Watauga River (25.8 square miles drainage area) Parameter WNC Mountain Curves Design Bankfull Area (Abkf) 198 sq ft 184 sq ft Bankfull Discharge (Abkf) 1,196 cfs 1,200 cfs Bankfull Width (Wbkf) 63 ft 58 ft Bankfull Depth (Dbkf) 3.0 ft 3.2 ft Bankfull Cross -Sectional Area (y) vs. Drainage Area (x): y = 21.51x06a Bankfull Discharge (y) vs. Drainage Area (x): y = 100.64x° 76 Bankfull Width (y) vs. Drainage Area (x): y= 19.05x037 Bankfull Mean Depth (y) vs. Drainage Area (x): y = 1.11x031 Units are as depicted in table above. Source: Harman, W.H. et al. 2000. Bankfull Regional Curves for North Carolina Mountain Streams. In: Kane, D.L. (Ed.). Proc. A WRA Conf. Water Resources in Extreme Environments, Anchorage, AK. Pp. 185-190. Vegetation Assessment The site was evaluated for existing native and non-native invasive species. The extents and locations of Japanese knotweed populations were observed to inform management strategies. The primary goal established through discussion with MountainTrue is to contain knotweed and facilitate native planting establishment and achieve aesthetic goals of using the site for demonstration. Upstream sources of knotweed are abundant such that eradication is not a primary goal. Knotweed is well established on the site, particularly just above the dam on the left bank. The left bank will likely be graded back about 10' in this area. Knotweed is also present on the rocky bar on the downstream right floodplain below the dam. Two treatments were performed under the direction of the Design Team in fall, 2023. An additional treatment is scheduled for spring, 2024, prior to the commencement of construction. Remaining material will be physically removed and disposed of at an offsite waste facility. Notes have been added to Phase 1 and Phase 2 sequencing sheets that knotweed should be removed prior to moving underlying bank material on the site. Follow-up treatments may be scheduled pending sufficient funding for this activity. Other invasives were observed including: o Rosa multiflora- Multiflora rose o Allaria petiolate - Garlic mustard o Microstegium vimineum -Japanese stiltgrass Trees were mapped by the surveyor and using submeter GPS. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum Native plants observed on the site included the following woody species: Native species Botanical Name Common Name Notes Platanus occidentalis American sycamore Aesculus fiava yellow buckeye Juglans nigra black walnut Carya sp. hickory sp. Fagus grandifolia American beech Robinia psueudoacacia black locust Prunus serotina black cherry Crotoegus sp. hawthorn sp. Liriodendron tulipifera tulip tree Froxinus pennsylvanica green ash dead Sambucus canadensis common elderberry Betula lenta sweet birch Hammamelis virginiana witch hazel Prunus pennsylvanica pin cherry Acer rubrum red maple Magnolia acuminate cucumber magnolia Hypericum sp. St. John's wort sp. stream bank Tsuga canadensis E hemlock Salix nigra black willow point bars and stream banks Alnus serrulato tag alder point bars Swido amomum silky dogwood point bars Physocarpus opulifolius nine bark point bars and stream banks The restoration approach will include re-establishing a native plant community at the site in disturbed areas. To achieve this, the intended approach will include: ■ Live staking and plugs along the streambank ■ Container planting and/or bare root planting in upland areas ■ Native and temporary and permanent cover seed mixes Many of the species identified onsite, and other species deemed appropriate based on the physiographic setting and project location, as well as availability from nearby nurseries make up the proposed planting plan provided in the plans on Sheets 6.0-6.3. 404/401 Permitting Assessment Activities Jurisdictional determinations were completed for streams and wetlands. Two jurisdictional features are present on the site, the Wautaga River and UT1, a tributary that comes under Shulls Mill Road on the left side of the river. No wetlands were identified. A threatened and endangered (T&E) species pedestrian survey was completed on July 6t" to review the site for suitable habitat presence/absence for T&E species identified by the USFWS for Watauga County. No critical habitats were identified but suitable habitat was found for various T&E bat species as well as green floater mussel; although no known records exist near the project area, or anywhere on the W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum Watauga River in recent history. Tree removal is proposed for the dormant season, subject to construction funding availability. A scoping letter was provided to USFWS on December 81", 2023 summarizing these findings. Wildlands has been coordinating with NC WRC to develop a suitable sediment management plan that will adequately protect the downstream hellbender population. DESIGN The design approach involves the following primary objectives: • Remove sediment from the historic impoundment to the anticipated post -removal average bed level (profile) to significantly reduce downstream sediment movement as compared to background levels; • Address ongoing left riverbank erosion through river realignment and restoration of pattern, dimension and profile to reference dimensions — a bankfull bench feature has been incorporated where feasible, but the reach is naturally confined; • During sediment removal and dam removal, plan sequencing that minimizes downstream sediment transport and turbidity is the primary objective wherever possible; • Utilize onsite resources where possible to reduce the projects' environmental footprint, cost, and to improve aesthetics by utilizing native materials, such as rock and soil. Approximately 350' of river restoration is proposed, starting just above the upstream limits of the first mid -channel bar and ending at the dam with material placement on the left side of the channel in the pool. 500' upstream of the dam is a significant grade drop depicted in the photo log. Between that grade drop and the start of restoration, shallow bedrock on the right side of the river is exposed in the bottom of the first two pools below the drop. The proposed profile plots on Sheets 2.1-2.2 have the existing thalweg bed profile and water surface superimposed. The proposed approach to river restoration is to establish a bed profile that ties from the approximate elevation of the riffle at the bedrock outcropping at station 3+25 of the proposed alignment to the head of the pool at the dam, station 6+25 (targeting the existing water surface in the pool as the grade tie in location). There is an existing drop of nearly 3' at the dam into the pool. Correspondingly, the average cut of material (depicted on Sheets 2.1-2.2) is approximately 3' and involves the removal of approximately 1000-1500 CY of material from the riverbed to form a new base level at the targeted pre - dam level. The range expressed is due to the lack of a clear boundary of what constitutes the riverbed given the bar formation and braiding of the channel. The right toe of river channel will be the target tie-in point with no disturbance to the bedrock - dominated right bank. The channel will be lowered by removing gravel and sand from the bed and relocating this material to construct the left bank and bench, and to designated spoil areas where material will be revegetated and capped/protected with larger stone or matting. Placement will be in low -risk areas that are anticipated to infrequently flood and more likely to be depositional rather than erosional in form. The left bank of the river will be heavily armored with rock as is typical throughout this confined reach of the river, and of the right bank which will be left undisturbed. Onsite rock will be harvested for this purpose and will extend below the proposed bed elevation to protect against minor bed adjustments, including pool formation. Above this boulder toe, the bank, bankfull bench, and terrace slope will be seeded with native riparian seed mix and matted. All disturbed areas will receive a mix of livestaking and container planting/bare roots. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum Near the upstream limits of the dam, the channel grading will flare out to the margins of the downstream pool with limited disturbance to the existing pool proposed. On the right bank, grading will tie in near the existing dam wall limits. The rock harvesting area further back on the right bank adjacent to and below the dam will be used as a rock source for the project and waste area for excess sand and gravel excavated from the river channel and sand and gravel bars. Waste material will be placed against the hillslope in a low velocity zone and will be seeded and matted and protected with rocky material where vulnerable to flow. The area left of the base flow channel will also be used for disposal of river material. Material will not be placed in the deepest part of the pool but where the pool shallows to approximately S' depth of water. A rocky ledge will be constructed on the pool side to help provide a stable base for the construction of a bankfull bench and slope into the higher ground upstream and along the left hillslope. This rock ledge will also provide habitat for the existing hellbender population. UT1 will be extended to meet the new left edge of the river channel which will require raising the channel near its existing downstream limits. UT1 is a small spring -fed stream and will be constructed as a steep cascade with a boulder structure and fill consisting of gravel and cobble and finer material to fill voids. Site access will be from Old Shulls Mill Road. Wildlands will coordinate with NCDOT to determine if any encroachment agreement is required. No utility conflicts have been identified within the proposed work area. An overhead utility line below the dam is not anticipated to affect the proposed activities. SEDIMENT MANAGEMENT A Tier 1 Sediment Evaluation study was completed for the nearby downstream Ward Mill Dam, prior to its removal, which revealed there is no potential for contaminated sediment within the watershed. Furthermore, the Shulls Mill Dam has been breached and only a small volume of sediment is present in the former impoundment and this sediment is thought to mobilize with storm events. Geologic Testing and Evaluation In October, 2023, geotechnical testing was completed using an excavator to complete test pits in the historic impoundment. The purpose of testing was to understand the composition and depth of the material. Test pits were completed both on mid -channel bars (B), in the backwater channel (A) and in the right portion of the channel (C) from upstream (1) to downstream (6). All holes were dug to approximately T-8' and could not be dug deeper due to cave in of saturated sand and gravel material. Material was consistently found to be sand, gravel and cobble. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum In test pits B3, B4, and B-C6, a 6"-12" band of organics with partially decomposed leaves was found at approximately 5' of depth. As there was not a consistent finding of organics at this level, these deposits are thought to be from shifting sediment in the historic impoundment and intermittent deposition from storm events. No boulders or large rock were encountered except at Al. This finding is consistent with geologic evaluation of hillslope conditions that suggest the convex hillslope topography sheds boulders away from the historic impoundment area. The post -project bed level is predicted to reestablish along the profile between shallow bedrock at the proposed start of river work with an even slope to the downstream head of riffle below the pool below the dam. This profile is proposed to be graded by river restoration activities involving the removal of 1000-1500 CY of sand, gravel and cobble material to establish the proposed grade. Diversion of the base flow is proposed during river restoration activities in order to minimize work in the wet to keep turbidity and downstream sediment transport levels minimized as much as possible. Sheets 4.1-4.4 depict and describe the diversion and river restoration process. DAM REMOVAL DESIGN AND EVALUATION Alternatives to Removal Shulls Mill Dam is an obsolete structure with no known benefits to its remaining on the landscape. The dam is a barrier to aquatic organism passage, is complicit in on -going erosion of fine sediments from the left bank, and is a safety and liability concern. The alternative of not removing or partially removing the dam would not realize the benefits sought to address the opportunities stated above. The risk to aquatic organisms from the removal phase is being addressed through the removal of upstream sediment from the historic impoundment to prevent a slug of sediment that could temporarily impact hellbender nesting and breeding. Diversion The historic impoundment is already dewatered but a series of diversion schemes is proposed to divert base flow away from the active work area. During Phase 2 of the diversion, the right half of the dam will be removed. A stable platform will be constructed upstream of the dam that does not rely on the dam foundation for stability. This will allow for full removal of the vertical limits of the dam. This removal will require special equipment to allow for subsurface use of the hydraulic hammer at depths of 6'-8' or more. The Dam will be removed using an excavator mounted hydraulic hammer and material will be removed on the upstream side of the dam where possible, to avoid material falling into the deep pool. A second excavator will be used, either on land or if necessary, on a second floating platform. Complimentary methods to hasten the removal process may be further explored during subsequent phases, which would entail setting charges or using chemically expansive agents within the core of the Dam. Materials Handling The materials generated by the Project are discussed below along with their potential fate and how these may be impacted by logistical or permitting considerations. Riverine Material from the river channel and mid -channel bars is proposed to be relocated onsite and where placed, revegetated, and partially or fully capped with larger river cobble and boulder material. Large gravels may also be suitable for capping areas with limited susceptibility to frequent flows. Material in the hydraulic shadow of hillslopes and not subject to routine high flows may be matted. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum Riverine Material from the left bank is thought to consist of fine depositional material from the historic impoundment. It may be used as a suitable growth media amendment in the reconstruction of the left riverbank and bench. Material will be mixed with sand and gravel from the riverbed where possible or placed in thinner layers near the ground surface to promote revegetation. Material removed from the Dam is anticipated to have an approximate volume of 1100 CY of rock. Concrete from the dam may be used in the following two locations on the site, both of which must be buried and capped: • Along the left bank through the river restoration reach, including downstream of the dam, when buried at least 3' below proposed grade and evenly mixed and distributed with other finer materials. Material must be a minimum of 10' from the proposed river channel toe. • Within the rock harvesting area on the downstream river right floodplain bar. Material may be placed to bring the floodplain bar up to the proposed grade. Material should be placed to be at least 2'-3' below grade and evenly mixed and distributed with other finer materials. Material must be a minimum of 10' from the proposed river channel toe. Rebar should be cut from the limits of the concrete demolition using underwater equipment and methods and then removed from the site. In the vicinity of the middle of the dam, the approximate depth to the foundation beneath the base flow pool level is anticipated to be 6-8'. The contract will include a line item and a specification for this activity and a specification will indicate acceptable finished condition. The target condition will be to remove rebar entirely or else flush with bedrock or the portion of the dam concrete work to remain. Rebar shall be removed from the Project Site to an appropriate disposal location for recycling. Imported stone from the construction entrance shall be left in place unless otherwise directed by the land owner or project management team. The project team will coordinate the future pull -off proposed by NCDOT as part of on -going highway plans in determining how to leave the area. If any stone is imported for other river work or purpose, stone may be buried within banks or rocky bars and should be covered with native material and buried to prevent re -exposure from river flows. Safetv Measures and Risk Management The following safety and risk management activities should be implemented. • Traffic management and safety, Safety fence should be placed to block off the work area from existing trails. No boat passage is anticipated; however, post a sign at the upstream river access entrance facing upstream that indicates the site is off limits for use. A sign shall be posted along Shulls Mill Road near the construction entrance or other flat areas that are currently used for pedestrian access, stating that the site is off limits for use (e.g. DO NOT ENTER or NO TRESPASSING signs). Flooding and high-water impacts to worksite shall be considered and pre -storm measures taken as necessary, including: o Remove equipment from river channel and bankfull bench areas, o Remove temporary crossings blocking high flow, o Reinforce temporary rock levies and coffered off areas to prevent failures, o Ensure matting is applied to recently graded banks before storms and at the end of each workday. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum SCHEDULE The following construction and project schedules are anticipated: Construction Schedule Construction Activity Schedule Mobilization Week 1 Access to Rock Harvesting / Diversion Phase 1 Week 1 Rock Harvesting Phase 1 Week 2-3 River Restoration (upstream of UT1) Week 3 Diversion Phase 2, riverbed grading right side of channel, removal of right side of dam, closure of rock harvesting area Week 4-5 Phase 3 river restoration downstream of UT1 left bank, removal of left side of dam, UT1 restoration Week 5-6 Site clean-up and demobilization Week 7-8 Project schedule Project Activity Schedule Tree Clearing February— March, 2024 Construction May 1- July 15, 2024 As -Built Survey for Map Revision August — October, 2024 As -Built & Letter of Map Revision Q4 2024 - Q1 2025 W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum PERMITTING REQUIREMENTS The project requires 404/401 permitting, FEMA floodplain permitting, and an Erosion and Sediment Control (ESC) permit. Scoping letters were sent to agencies in November & December, 2023. The following considerations detail significant aspects of permitting and access. 404/401 Permitting The Dam and limits of proposed disturbance will require review for NEPA and Section 106 of the National Historic Preservation Act to evaluate threatened and endangered species and historical and cultural resources — scoping letters were sent to NEPA and USFWS in late 2023. On November 10, a scoping letter was sent to NC State Historic Preservation Office (SHPO) to request review and comment on any archeological or cultural resource considerations. Previous study of Shulls Mill by an architectural historian resulted in a preliminary conclusion that the site would not be eligible for the National Register of Historic Places. SHPO responded on January 2, 2024, indicating that they have no concerns or requests related to the project activities as proposed. Based on this response, no additional evaluation of site resources is anticipated to be required. The Corps of Engineers will be provided with this information as the lead agency on consultation with Tribal HPO entities. USFWS concerns are anticipated to center around ME bat species and the project proposes to remove all trees prior to April 1, 2024 (which is the commencement of seasonal bat moratoria). 404/401 will be required for stream impacts. These are detailed in the pre -construction notification for which this memo is being prepared. Temporary impacts are proposed to the Watauga River and to UT1 for construction activities, including temporary crossings and proposed restoration work; no wetlands were identified on the site. FEMA Floodplain The Project site is in the 100-year floodplain and requires a floodplain development permit that will be obtained through Watauga County. A no -rise model, report and certification are being prepared for submittal (anticipated in January, 2024 with permit by March 2024). The existing FEMA model for the Watauga River is a HEC-RAS model. The model has been updated for existing and proposed conditions. The proposed conditions show a reduction in base flood and floodway water surface elevations as compared to existing conditions. If the reductions in base flood or floodway elevations exceed 0.1' which will apply at this site, a post -project topographic survey and Letter of Map Revision (LOMR) is typically required. A LOMR submittal should be anticipated for this project. Erosion and Sediment Control Permitting The Project will exceed 1-acre of disturbed acreage and require erosion and sediment control permitting through NCDEQ-DEMLR. Permitting carries a cost of $100/acre and requires preparation of an erosion control plan, permit application and specific plan sheets. Permitting will be submitted in February, 2024 in order to obtain permitting coverage by mid -April. A disturbance of >1 acre is anticipated and erosion control permitting will be required. A trout buffer waiver will also be required. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum NCDOT Encroachment / Coordination Site access is proposed to traverse NCDOT Right of Way adjacent to SR 1568 Old Shull's Mill Road (North) and an encroachment agreement is anticipated. NCDOT was contacted on January 4, 2024 to commence this coordination. It is anticipated that a simple agreement will be required to locate a construction entrance along the NCDOT-maintained Shulls Mill Road. The request was submitted to the division office and coordinated with staff. Wildlands will also discuss plans to close the road between the Copeland driveway and Hwy. 105. Excerpt from Preliminary NCDOT Plans PROJECT IMPACT MONITORING AND MITIGATION Wildlands and MountainTrue will work with NC WRC to identify and coordinate mitigation needs of the project. Part of the currently scoped project activities include pre- and post -project biological surveys. Pre -project surveys commenced in summer, 2023, and included the use of Passive Integrated Transponder (PIT) tags allowing for areas to be resurveyed and tagged animals t be located by a special antenna if present in the area. Summer 2023 surveys did not locate animals in the pool downstream of the dam. After construction is complete, Wildlands will prepare a set of as -built drawings for the completed project activities. The as-builts will entail redline design plans with notes on any deviation from the plans, supplemental information and clarifications. Wildlands will prepare photo documentation at ten photo points and will prepare a list of recommended post -construction inspection and monitoring activities focused on evaluating bank stability and documenting any major changes in the bed or banks of the river. The site is proposed to be inspected after rainfall events exceeding 1" for the first 3 months and quarterly or after flows at or near bankfull for the remainder of a two-year post -construction monitoring period. Additional monitoring beyond that date would be on an as -needed basis. Bank and bed changes, including any perceived instability, will be noted and a management plan prepared to deal with any concerns. MountainTrue will conduct routine visits, with Wildlands joining to visit the site at least twice in the first year and once in the second year. W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum Figure 1 Project Site Map W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum II // rev�ti� �3.:r• III .•c � i a E-3 a � � ear► o a M > o C� O \1 a F � N 0 m _C_ L G > N b s °A m m 0 RJ Appendix A Project Permitting (90%) Plans (Included Separately) W Shulls Mill Dam Removal — 90% Plans and Permitting Technical Memorandum ec H i .......... dao%,y 4@@LIS 9oa `s:'aa' BLSEEO saKv a�'inA ,d35 L'7-7777 uTIOz2DWON'X4unoDL-�nujL-M g. 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E z _ ` a t 1O c° - O 3 = u °- v v m ` W ._1. = LL -10 r o m- E o Z om� o" -- S u 3m -J° n ° ¢ - oG= �3_ = g�v"°y - q asp - >t o Ec - - 6v� em — - o_ SN oy z �2" o ">_ �_ �__ u - -0 �oz= 12 o z - F. E mr ° _ _ o= o 0 n v- E m S v zz E I ¢__- E v �_r a- Q�n °¢¢ia ovi �s - G oe Y; °�2 Nm �E zon z � z° Fo3 vE `WELL H ° v m - H C � Ev 0 3 o w v w N 3 EwE �3 Appendix B Project Photo Log W Shulls Mill Dam Removal —90% Plans and Permitting Technical Memorandum Upstream rock/boulder ledge feature (Ikg. US); sand bar right view is upstream access point; photo taken from approximate start of river restoration reach Overhead view (Ikg. IDS) of same location; knotweed on left is being treated; river restoration reach starts near upstream limits of mid -channel bar visible in foreground Equipment access route to head of river restoration reach and mid -channel gravel bar access/haul route Start of river restoration reach (Ikg. IDS); Mid -channel bars to be used as access and haul route; vertical left bank to be restored to stable slope; right bank with bedrock and boulders to be left intact Proposed river restoration will slope and revegetate the left riverbank, photo right (Ikg. US) UT1 confluence will be extended out to meet the realigned river channel (Ikg. US) View of upper and lower mid -channel bars from left bank; right bank will be left intact and serve as the right bank of the restored & realigned river channel Overhead view (Ikg. IDS) of rocky point bar on river right upstream of dam; proposed center of restored channel will align with left edge of rocky bar Rocky point bar on river right upstream of dam (Ikg DS); broad but shallow boulder in foreground to be removed and river channel to be realigned through this bar Looking at upstream left side of river channel from rocky point bar; the primary river outlet through the dam is denoted (Ikg. IDS) Upstream face of dam Downstream face of dam Three river flow outlets through breached dam and downstream pool Downstream pool (Ikg. US); river left side of channel is proposed to be filled with rocky material and is anticipated to be a natural depositional area post -removal A rocky ledge will be established on the edge of deeper water to provide hellbender habitat (see next photo) — rocky fill will be placed upslope of ledge to form a gravelly bankfull bench on river left Left side of river in pool downstream of dam (Ikg. US); proposed rock ledge to be established for hellbender habitat along arrows and fill placed upslope; to the right of the arrow closest to the dam, the lower half of the dam wall will be left intact approximately as shown and rock fill placed to mask it (this will be the only portion of the dam that is not fully removed) �y 1{1{e Upper half of wall in right foreground to be removed; the purpose of leaving the lower half of the wall is to contain and protect from headward erosion historic fine-grained deposition behind the dam Left side of river in pool downstream of dam (Ikg. DS); Note stable downstream riffle grade control that maintains pool elevation Right side of river at dam (Ikg. US); this area will be used as a rock harvesting area. Rock will be reused to stabilize the left riverbank through the river restoration area; excess gravel and sand from bars and river channel will be brought to this area for disposal, seeding, and capping with larger rock or matting; an arrow shows the location of foundation remnants at the primary breached/destroyed portion of the original dam (more photos of this area follow); the fill area will be protected from high flows by the large boulder knoll Access to rock harvesting area from rocky point bar; boulders of the size seen in foreground would be harvested for reuse; area in foreground is location of realigned river restoration channel Access to rock harvesting area looking back towards river Rock harvesting area and breached/destroyed portion of dam (footer and rebar in foreground) Area to right of prior photo Downstream of foundation remnant in rock harvesting area; after harvesting rock, this area will be filled with river gravel and sand from mid -channel bars and from material excavated from river channel Downstream portion of rock harvesting area — area has been heavily scoured by high flows that circumvent dam on this side through the historic breach. This downstream area only to be harvested as contingency and provided that large rock can be placed to cap gravel and sand and that exposed areas of fine material will be revegetated w 7. ", a , I d Looking at Shulls Mill Road from UT1 near UT1 proposed temporary crossing; access from road proposed in far left of photo UT1 (Ikg. IDS) taken from just downstream of proposed temporary crossing; tree on UT1 left bank is priority to be protected and saved View from left bank; the two adjacent trees on right will be removed to allow for bank grading .FAQ View from left bank near UT1; some of trees closer to dam (right portion of view) will be removed to facilitate transition grading from high depositional terrace to river and downstream pool elevation View from left bank at UT1; all trees within 10-15' of the existing top of bank will be removed to facilitate bank restoration and revegetation; trees with arrows not slated for removal - �• - - � _ - it U. I 'AID - !f e r . r - in • m _ Left bank near upstream start of river restoration work; knotweed is being treated pre -construction; trees at back of bench to remain Hwy 105 (to left) and Shulls Mill Road (to right), dam in center view; remnant concrete wall/buttress into slope to be removed to approximate grade of slope for safety purposes Looking towards construction entrance access of Shulls Mill Road (in background) from close to UT1 Mao�r�.. e ;Ain i t t , S � W �'V ilt a ks r