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Home My WebLink About20081704 Ver 1_401 Application_20081108 McGill A S S O C I A T E S November 14, 2008 Ms. Liz Hair, Asheville Regulatory Field Office US Army Corps of Engineers 151 Patton Avenue Room 208 Asheville, NC 28801-5006 Ms. Cyndi Karoly, Supervisor 401 Oversight and Express Permits Unit 1650 Mail Service Center Mail Service Center Raleigh, NC 27699-1650 Dear Ms. Hair and Ms. Karoly: P A 1 0 8- 1 7 0 4 2 D tpp8 Re: 404/401 Permit Application for the Greenway Trail: Stream Enhancement for Town of Black Mountain Buncombe County, North Carolina Attached please find the 404/401 permit application for the Greenway Trail: Stream Enhancement project for the Town of Black Mountain, North Carolina located in Buncombe County. The information included with this application has been developed in conjunction with the Town of Black Mountain and their Greenway Trail Planning Committee. The 100 foot section along the Swannanoa River has been selected as the site for a greenway trail boardwalk that will run underneath the existing Norfolk Southern railway crossing. The proposed project will include the construction of the boardwalk, the removal of an abandoned sewer line, and the removal of rock rubble that exists within in the stream channel. A boulder cross-vane will be installed upstream of the greenway trail boardwalk in order to direct stream flows more effectively through the railway trussel and establish grade control for the project site while improving water quality. We have carefully developed this application and have considered all potential impacts and benefits of this work. We look forward to quick regulatory action and approval of this greenway trail boardwalk and stream enhancement plan so this important work can be accomplished. E n g i n e e r i n g P l a n n i n g F i n a n c e McGill Associates, P.A. • 420 East Park Avenue, Suite 305 Greenville, South Carolina 29601 864-235-6759 • FAX.- 864-235-6766 eocN ? ? ? ? . ? v A? ?M? I PAR w??os??si Ms. Liz Hair and Ms. Cyndi Karoly November 14, 2008 Page 2 of 2 We have made every effort to effectively address each and every concern related to this restoration plan and the need to protect this area's water resources. Upon completion of our September 30th site visit, we have proposed that the minimum low chord the boardwalk to be 0.5 feet above the 2-year 24-hour storm event WSEL of 2346.00 feet. We believe that this plan, developed for the project site, is comprehensive and represents a well thought-through consideration of the existing site conditions and potential water quality problems and will result in effective management of any "short term" impacts during the construction phase. We are sending Kevin Barnett, NCDWQ - Asheville, a copy of the permit package and have also taken to the liberty to provide David McHenry, NCWRC - Waynesville with a copy as well. We are looking forward to being able to proceed with this work. Please let myself or Will Rector, Engineering Associate, know of any issues or consideration that needs to be addressed to secure approval for this planned work. If you feel an on-site meeting would be helpful, we are available to meet with you at your convenience. We can be reached at phone number 864-235-6759 or emails jpjohnskmc ig llengineers.com or willkmc ig llengneers.com. Thank you for your attention to these applications. Sincerely, McGILL ASSOCIATES, P.A. I.P, pel?_ J. P. JOHNS, P.E. Enclosure JPJ/war cc: Mr. David McHenry, NC Wildlife Resources Commission -Waynesville Mr. Kevin Barnett, NC Division of Water Quality - Asheville Forrest Westall P.E., McGill Associates, P.A. R:\Proj ects\2008\08.03004_Town_of_Black_Mountain_Master_Plan_003\Documents\Permits\Corp Permit Cover Letter.doc McGill Associates, P.A. 420 East Park Avenue, Suite 305, Greenville, South Carolina 29601 864-235-6759 • FAX: 864-235-6766 401/404 PERMITTING PACKAGE GREENWAY TRAIL: STREAM ENHANCMENT FOR TOWN OF BLACK MOUNTAIN BUNCOMBE COUNTY, NORTH CAROLINA • • • • • • • • • • • • • • • McGill f AS SOCIATES,P.A. NOV ? ? 2008 ND5 A ? SOR??A?R??CN Y'1?? GREENWAY TRAIL: STREAM ENHANCEMENT FOR TOWN OF BLACK MOUNTAIN BUNCOMBE COUNTY, NORTH CAROLINA KC 0?- , '.l t7 _ x Prepared for: US ARMY CORPS OF ENGINEERS NORTH CAROLINA DIVISION OF WATER QUALITY ?n November 12, 2008 D [? °a N OAR 0? S/ ov O - O 0 NG?NE. ON .O N0V 17 2008 DENK • WA(t M?,j? Eli 6RANCH WE"t4oS AND STOR Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 • Buncombe County McGill Associates, P.A. 1. PROJECT PURPOSE & DESCRIPTION The purpose of this project is to construct a greenway trail boardwalk underneath an existing rail road trussel along the Swannanoa River adjacent to down-town Black Mountain, North Carolina. In addition, the project includes the removal of an abandoned sewer line running parallel to the Swannanoa River and the removal of rock rubble that was apparently placed in the stream section to protect the abandoned sewer line. A boulder cross-vane will be installed upstream of the greenway trail boardwalk in order to direct stream flows more efficiently through the rail road trussel and establish grade control for the project site while improving water quality. The work described in this proposal will help the Town of Black Mountain achieve its' dream of having an interconnected greenway trail system running along the Swannanoa River and through downtown Black Mountain. The Town of Black Mountain is the sponsor and the responsible party for this work. Work on the site consists of the establishment of the greenway trail boardwalk, removal of abandoned sewer line and stream enhancement efforts. All work in or near the designated surface waters will be supervised by trained personnel from McGill Associates, P.A. 2. SITE DESCRIPTION Town of Black Mountain Greenway Trail - Swannanoa River (DWQ Class C) - The project site is approximately 100 feet in length located along the Swannanoa River in Black Mountain, North Carolina. The project area is located just off Ridgeway Avenue near downtown Black Mountain and is crossed by a Norfolk Southern railway crossing. Currently, the river channel under the rail road trussel is largely obstructed during base flow conditions due to rock/boulder rubble that has been apparently been placed to protect an abandoned exposed sewer line running parallel to the Swannanoa River. The rock rubble has backed up normal flow conditions upstream causing portions of the channel to aggrade with fine silt, unlike typical mountain streams/rivers found in the area with rocky bottoms. These conditions can be found just downstream where the historical bed grade has been kept. • The existing stream banks appear to be fairly stable through the project reach but a lack of suitable buffer is evident along the upper portions on the downstream right hand side where the landscape is dotted with residential development. • Access is not an issue. The Norfolk Southern Railway and the Town of Black Mountain have agreed on the location and construction of the greenway trail boardwalk. However, Norfolk Southern has requested that no part of the boardwalk be attached to the surrounding concrete abutments and that a roof or shield be placed over the boardwalk in order to prevent any debris from falling on pedestrians while under the trussel. Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 • Buncombe County McGill Associates, P.A. • The disturbed area for the proposed site is approximately 0.2 acres, and will not require an Erosion Control Permit from the North Carolina Department of Natural Resources Division of Land Resources Land Quality Section. The Greenway Trail site work described in this plan will need to be permitted by the U.S. Army Corps of Engineers (Section 404 permit) and the N.C. • Department of Environment and Natural Resources, Division of Water Quality (Section 401 Water Quality Certification). 3. TECHNICAL DESCRIPTION On July 28, 2008, members of the McGill Associates design team visited the proposed site. While on site, the team members observed the existing channel banks, topography of the area, • and specific locations where the proposed greenway trail boardwalk would be placed. Photos were taken of the project site and field notes were prepared for use in the design process. An updated detailed survey of the stream corridor was performed. The survey consisted of • stream channel cross-sections, point elevations, and the location of existing roads, utilities, and structures. The survey was used to generate an accurate representation of the stream and 0 surrounding topography. After completing the field visit, a preliminary review and evaluation was performed of available site mapping to include USGS 7.5 minute Quad data, Digital Orthophoto Quad (DOQ) data (1998), Color Infrared imagery (2004), as well as other available map data. The contributing drainage area (at the project site) was calculated to be approximately 11.1 square miles Using • Arc-GIS (with available extensions) and Digital Elevation Models (DEM) from the NC Floodplain Mapping Project. Available hydrologic and hydraulic data for the project site was also researched, including a review and evaluation of available Regional Curve data (NCSU - Stream Restoration Institute (SRI), Preliminary Mountain Curve) for incorporation into the • design process as applicable. Using the data collected during the field visit, a rough site sketch was developed defining existing conditions with annotated hand notes, descriptions and repair recommendations. These • notes were later refined for use in the development of the repair concept for the site roughly defining the locations, sizes, and types of modifications and features proposed for construction at 0 the site. 0 In addition to the Existing Site Plan, the Proposed Enhancement Plan was also developed including, plan view, typical cross-section, construction details for typical site features, technical construction specifications, and planting recommendations for the recommended activities. 0 0 An onsite meeting was conducted on September 30, 2008 to discuss this project approach. • Attendees included: Laurie Beckwith and Liz Hair, US Army Corps of Engineers; Kevin Barnett, North Carolina DWQ; Dave McHenry, North Carolina Wildlife Commission; Jim Orr, Marcy Onieal, and Elizabeth Teague, Town of Black Mountain; J.P. Johns, Will Rector, and David Scott, McGill Associates. Discussions during the meeting included: Black Mountain Greenway Trail: Stream Enhancement Buncombe County November 12, 2008 McGill Associates, P.A. • Construct the boardwalk as high and as small as possible, while still meeting all ADA requirements. • Bring the boardwalk off of the existing bank on north side, with minimum impact to the existing bank. • Plan for the protection of the stream bed when the sewer pipe and any other material are moved. • The rock vane is a good application for this project; also consider placing an additional vane upstream as well. Action items from the meeting included: • Confirmation with the Railroad on the minimum clearance they will require. • McGill Associates will complete the 401/404 permit application for the Town, US Army Corps, DWQ and Fish and Wildlife comment. • Apply for a nationwide permit number 18, as the proposed fill is less than 25 cubic yards. • Obtaining a 401/404 is possible, but will depend on achieving minimal impact and must include stream enhancements, including: • Stream bed stabilization • Address stream-bank erosion • Stabilization and sensitivity to banks that decking would connect to - 4 -- --4-- Looking Looking Downstream at Railroad Crossing n u Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 • Buncombe County McGill Associates, P.A. • DESIGN CONSIDERATIONS As understanding of this site has increased, and in an effort to streamline the approach to the proposed activities, further repair alternatives were developed. In design development, an effort was made to utilize techniques which would be simple and understandable to a typical general contractor (reducing the need for specialty contractors) and which could be easily modified or refined in the field by the designer (or contractor) based on site conditions encountered during • construction. It was also intentional that repair and stabilization methods would be constructed . with commonly used and readily available construction materials. The selected repair alternative for the site includes removing the abandoned sewer line and existing rock rubble. The removal of the sewer line will decrease the potential for water quality • issues in the future. The removal of the rock rubble will re-establish the historic grade through the stream reach and provide water quality enhancement for the upstream section by increasing flow during base flow conditions. i The addition of the boulder cross vane will help direct water flow and erosive forces through the railroad crossing while adding grade control upstream of the concrete abutments and proposed boardwalk. The cross vane will also provide water quality by protecting channel banks with a significantly smaller rock volume, compared to rip-rap, and increased habitat for native fish and macro-invertebrates. The proposed repair plan calls for the utilization of off-site borrow materials where necessary, including streambed borrow consisting of sand, gravel, cobble, and small boulders for the construction of the in-stream structure. Where appropriate, the existing rock rubble in the stream will be used for the construction of the boulder cross-vane. One additional benefit to this type of enhancement is the placement of a natural (less structural) repair that is more appropriate for the reach and generally more aesthetically desirable. The proposed wooden boardwalk will be constructed in order to minimize impacts to the surrounding stream and railway structure. The boardwalk will be built to withstand flows from small storm events, but will not be structurally re-enforced to withstand flood flows and debris typically found during 50 and 100 year flood events. After consulting with the North Carolina Division of Water Quality (NC DWQ) and the US Army Corps of Engineers, it was determined that the Boardwalk should be placed as high as possible in order to minimize the impact on base- flow conditions and bed load transport during smaller storm events. Utilizing hydrologic and hydraulic analysis, the water surface elevations (WSEL) upstream of the railroad crossing were calculated for the corresponding storm events. At a minimum, the low chord of the boardwalk will be raised 0.5 feet above the Q2-year storm event WSEL at an elevation of 2346.50. This will put the low chord approximately 3.2 feet above the channel invert elevation. To meet ADA standards, the boardwalk will have a maximum outside width of 72-inches (or 6 feet). Event Q cfs) Upstream WSEL AVD'88) Min. Low Chord Elevation Channel Invert NA 2343.33 2346.50 Q1 200 2344.75 2346.50 Q2 575 2346.00 2346.50 QS 1590 2348.55 2346.50 Q10 2700 2350.80 2346.50 -- 5 -- Black Mountain Greenway Trail: Stream Enhancement Buncombe County November 12, 2008 McGill Associates, P.A. The proposed minimum low chord elevation is 2346.50, and may be set higher based on the minimum clearance allowable by Norfolk Southern Railroad. S e ? F c r°' 0 'f" A` tee. ? ? ,? Looking Downstream at Proposed Boardwalk Location -- 6 -- Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 Buncombe County McGill Associates, P.A. 5. PROPOSED PLAN Information collected during site visits was used to establish the proposed stream enhancement activities and construction of the greenway boardwalk. As shown on the attached plans and details, the proposed plan utilizes natural channel design techniques in order to help improve the surrounding water quality in the Swannanoa River. The proposed project will also provide a direct source of community wide educational opportunities for stream enhancement techniques. Grading & Stabilization Minimal grading activities will be needed for the installation of the proposed greenway trail boardwalk. All disturbed areas will be stabilized with biodegradable matting and planted with a native seed mix and appropriate native plantings. • Removal of Abandoned Sewer Line and Rock Rubble In order to construct the boardwalk, the existing abandoned sewer line will be removed and capped at each end. Temporary Coffer Dams will be utilized so the sewer line can be removed in a "dry" condition, and eliminate the possibility of base flow impacts. The removed sewer line will not be re-used for any portion of this project, and will be removed from the site and properly disposed of. Removing the abandoned sewer line will improve water quality by eliminating a potential source of direct discharge of residual sewer matter. 49 In order to remove the sewer line, the adjacent rock rubble will be removed and may used in the 0 construction of the cross vane. The rock rubble has essentially dammed upstream flows during • base flow conditions, causing water to pool upstream. This has caused fine sediments to accumulate and blanket the bottom of the river channel causing potential adverse impacts to macroinvertebrates and fish. Removal of the sewer line and rock rubble should improve the natural river function and hydraulics by allowing the creation of a deep pool through the meander bend at the existing railroad trussel. Existing Sewer Line to be Removed Existing Rock Rubble to be Used in Cross Vane -- 7 -- • • s • • • • 0 • • 0 • • • • • • 0 • • s • s • • • • s • • • s • • • • • 0 Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 Buncombe County McGill Associates, P.A. In-Stream Structures A boulder cross vane will be installed upstream of the rail road trussel. The boulder cross vane structure will be utilized to reinforce and stabilize the stream banks upstream of the railroad trussel and provide grade control. The boulder cross vane will be constructed out of natural materials, typically consisting of locally quarried boulders. However, a few boulders from the rock rubble, planned for removal, may be used as well. The upstream side of these structures will be lined with a non-woven fabric and backfilled with appropriate borrow material or coarse aggregate as approved by the designer to improve stability and reduce the potential for piping through the structure. The estimated fill volume of the rock cross vane structure is 18 cubic y a rds. The boulder cross vane will concentrate stream energy toward the center of the channel and away from the near-bank areas, concrete abutments, and the greenway trail boardwalk. In doing so, the vane reduces shear stress along the banks and prevents bank erosion. The structure will also provide valuable in-stream habitat by holding a deep pool directly downstream of the structure. A detail for the boulder cross vane can be found in the preliminary drawings. Greenway Trail Boardwalk The greenway trail boardwalk is being implemented in order to connect the vast trail system planned for the Town of Black Mountain Greenway Trail System along the Swannanoa River. The boardwalk will be made of wood and be a maximum of 72-inches wide. In order for the boardwalk to pass underneath the rail trussel, Norfolk Southern has required that no part of the boardwalk be attached and that the boardwalk must have a canopy roof or shield to protect pedestrians from falling materials off the railroad tracks over-head. The greenway trail boardwalk will be built to withstand normal follow events, but will not be expected to endure flood flows typical of the Swannanoa River. The boardwalk will be designed to allow natural stream function to occur underneath the structure. A preliminary drawing including the typical cross-section can be found in the attached preliminary documents. The estimated fill volume of the posts for the boardwalk is 2 cubic yards. Vegetated Buffer A vegetated buffer (Storm Water Easement) will be obtained and established along the restored Reach from the adjacent land owners. The buffer will be seeded and planted with the appropriate native riparian vegetation and will provide channel and overbank stability and treatment of surface waters traveling laterally through the buffer. Species will consist primarily of native shrubs and trees. The repaired bank will be planted with the appropriate channel bank species in the form of bare-root seedlings (and/or container plants), and transplants where available. Native shrubs that are available elsewhere on-site will be removed with as much of the root ball intact, as possible, and transplanted adjacent to the restored channel. The majority of the planting efforts (with the exception of site transplants) will be conducted by locally identified plant sources or purchased from local, reputable nurseries. -- 8 -- r r r M Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 Buncombe County McGill Associates, P.A. Other sources, outside of the local area, may be used depending on the availability of plant material and as approved by the engineer. Shrub species will be planted at a spacing of 6 ft. by 6 ft. to achieve a desired planting density of approximately 1,200 shrubs per-acre in order to improve potential for the desired 5-year survivability. A representative from McGill Associates will be on site to observe and direct planting efforts associated with the buffer restoration. The engineer must approve any substitution of shrub species in advance. Temporary and/or permanent seeding measures will be applied to areas disturbed during construction operations to allow for localized stabilization while riparian species establish themselves. Technical Specifications are attached in Appendix A. Preliminary Drawings for the proposed Stream Restoration/Stabilization Plan are attached in Appendix B and include proposed stream alignments, typical cross-section, proposed structures, structure details, erosion and sediment control details, and a planting schedule and details are attached. Sequence of Construction The sequence of construction will be coordinated through the on-site representative of McGill Associates during the pre-construction meeting with the presumptive contractor. All construction activities will adhere to the conditions of the 404 / 401 and erosion control permits issued by the corresponding North Carolina agencies. The sequence of construction will be proposed as follows: • Clear and grub overbanks where needed; • Remove rock rubble from stream bed; • Remove abandoned sewer line and cap/bury remaining ends; • Install boulder cross vane per direction of representative of McGill Associates; • Install greenway trail boardwalk; • Stabilize entire site with temporary and permanent measure, including native vegetation; __9__ 0 r Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 Buncombe County McGill Associates, P.A. 6. REGULATORY REQUIREMENTS 401 WATER QUALITY CERTIFICATION (Requirements based on typical Certification conditions) - The following mandatory conditions apply to all repair sites: 1. Erosion and Sediment Control Practices a. The erosion and sediment control measures for the project must be designed, installed, operated and maintained in accordance with the most recent version of the North Carolina Sediment and Erosion Control Planning and Design Manual. b. The design, installation, operation and maintenance of the sediment and erosion control measures must be such that they equal or exceed the requirements specified in the most recent version of the North Carolina Sediment and Erosion Control Planning and Design Manual. The devices shall be maintained on all construction sites, borrow sites, and waste pile (spoils) projects, including contractor-owned or leased borrow pits associated with the project. c. For borrow pit sites, the erosion and sediment control measures must be designed, installed, operated and maintained in accordance with the most recent version of the North Carolina Surface Mining Manual. d. The reclamation measures and implementation must comply with the requirements of the Sedimentation Pollution Control Act. 2. No Waste, Spoil, Solids, or Fill of Any Kind - No waste, spoil, solids, or fill of any kind shall occur in wetlands, waters, or riparian areas beyond the footprint of the impacts depicted in the Pre-Construction Notification. All construction activities, including the design, installation, operation and maintenance of sediment and erosion control Best Management Practices shall be performed so that no violations of state water quality standards, statutes or rules occur. 3. No Sediment & Erosion Control Measures within Wetlands or Waters - Sediment and erosion control measures shall not be placed in wetlands or water to the maximum extent practicable. If placement of sediment and erosion control devices in wetlands and waters is unavoidable, they shall be removed and the natural grade restored within six (6) months. 4. Certificate of Completion - Upon completion of all work approved within the 401 Water Quality Certification or applicable Buffer Rules and any subsequent modifications, the applicant is required to return a certificate of completion to the 401/Wetlands Unit, North Carolina Division of Water Quality, 1650 Mail Service Center, Raleigh, NC 27699- 1650. 5. Sediment and erosion control measures must be implemented prior to construction and maintained on the sites to minimize sediment in downstream areas. Seeding for a temporary cover of wheat, millet, or similar annual grain or permanent herbaceous cover -- 10 -- r r • 0 0 • 0 0 0 0 • 0 0 0 0 0 0 0 0 • • 0 0 0 0 Black Mountain Greenway Trail: Stream Enhancement Buncombe County November 12, 2008 McGill Associates, P.A. should occur on all bare soil within five (5) days of ground disturbing activities to provide long-term erosion control. The projects should be accomplished in stages instead of leaving large tracts exposed to further storm events. Erosion control matting Flexible Growth Media should be used in conjunction with appropriate seeding on disturbed soils in steep slope and riparian areas, unless authorized under Division of Land Resources Erosion and Sediment Control approval. Matting should be secured in place with staples, stakes, or wherever possible, live stakes of native trees. Straw mulch and tall fescue should not be used in riparian zones. 6. Only clean, large, angular rock, large woody material or other natural stream design materials and techniques should be used for bank stabilization. Rock should not be placed in the stream channel in a manner that constricts stream flow or that will impede aquatic life movements during low flow conditions. Filter cloth should be placed behind large rock that is used for bank stabilization. Properly designed rock vanes should be constructed wherever should be constructed wherever appropriate on bank stabilization and channel realignment stream reaches to improve channel stability and to improve aquatic habitat. Root wads should be installed low enough in the bank so that a significant portion (at least one-third) of the root wad is inundated during normal flows. 7. The channel must be restored to a more stable condition. However, under no circumstances should river rock, sand or other materials be dredged from the stream channel under authorization of this permit except, if necessary, in the immediate vicinity of the eroding banks for the explicit purpose of anchoring and stabilizing of flow/grade control structures or for reestablishing the natural and more stable stream channel dimensions. Streambed materials are unstable in flowing-water situations and are unsuitable for bank stabilization. Stream dredging has catastrophic effects on aquatic life and disturbance of the natural form of the stream channel can cause downstream erosion problems. The natural dimension, pattern, and profile of the stream upstream and downstream of the permitted area should not be modified by widening the stream channel or changing its depth. 8. Stabilization measures should only be applied on or near existing erosion sites, leaving other stable stream bank areas in a natural condition. Grading and backfilling should be minimized and tree and shrub growth should be retained where possible to ensure long- term availability of stream bank cover for aquatic life and wildlife. Backfill materials should be obtained from upland sites except in cases where excess streambed materials are available. Berms are not permitted because they block the floodplain, constrict and accelerate flood flows, and often fail or impede drainage during large flood events. 9. Repairs to eroded banks should be conducted in a dry work area where possible. Sandbags or other clean diversion structures should be used where possible to minimize excavation in flowing water. 10. Heavy equipment should be operated from the bank whenever possible. All mechanized equipment operated near surface waters should be inspected and maintained regularly to prevent contamination of stream waters from fuels, lubricants, hydraulic fluids or other --11-- Black Mountain Greenway Trail: Stream Enhancement Buncombe County November 12, 2008 McGill Associates, P.A. toxic materials. Equipment used in stream channels must be clean, new or low-hour equipment. 11. As long-term stream stability is a concern with this type of work, it is strongly recommended that woody vegetation be established along stream banks where possible. Any riparian vegetation planting should be performed in accordance with the Guidelines for Riparian Buffer Restoration. (http://h2o.enr.state.nc.us/wrp/pdfibuffers.pdf) 12. The Permittee will provide on-site supervision of stability work including, but not limited to, bank re-shaping, in-stream structure placement, and riparian zone re-establishment by an appropriately trained individual. 13. Diffuse Flow - All constructed storm water conveyance outlets shall be directed and maintained as diffuse flow at non-erosive velocities through the protected riparian zones such that it will not re-concentrate before discharging into a stream. 14. Water Quality Certification Notification - The Permittee must provide a copy of this issued Water Quality Certification and attached cover letter to each property owner where the approved work will be performed. Finally, pending receipt of a final 404 Permit and 401 Certification, copies of these issued • documents and the associated conditions and comments provided by commenting agencies (when available) will be included in all final contractor packages that will be used for construction of the proposed plan. All regulatory requirements and the measures outlined in this document will be fully discussed with the chosen contractor and the inspectors for McGill Associates before any construction begins. During actual construction, inspectors will direct contractors to observe and apply good construction practices and the requirements described in this document. r -- 12 -- Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 Buncombe County McGill Associates, P.A. APPENDIX A TECHNICAL SPECIFICATIONS FOR STREAM REPAIRS AND BANK STABILIZATION PROJECTS TECHNICAL SPECIFICATIONS TABLE O F CONTENTS • • TITLE PAGE TABLE OF CONTENTS • SECTION 1 - GENERAL REQUIREMENTS 1 6.4 FILL MATERIALS 6 6.5 PREPARATION 6 1.1 SECTION INCLUDES 1 6.6 BACKFILLING, FILLING, AND SURFACE 1.2 SUMMARY OF WORK 1 PREPARATION 6 1.3 WORKFORCE EXPERIENCE 1 6.7 COMPACTION AND QUALITY CONTROL 6 1.4 SPECIFIC EQUIPMENT REQUIREMENTS 1 6.8 PROTECTION OF FINISHED WORK 7 1.5 MEASUREMENT AND PAYMENT 1 6.9 TOLERANCES 7 SECTION 2 - TEMPORARY FACILITIES 1 SECTION 7 - CHANNEL PROTECTIVE LININGS AND IN- STREAM STRUCTURES 7 2.1 SECTION INCLUDES 1 2.2 MEASUREMENT AND PAYMENT 1 7.1 SECTION INCLUDES 7 2.3 TEMPORARY SANITARY FACILITIES 1 7.2 MEASUREMENT AND PAYMENT 7 2.4 BARRIERS 1 7.3 REFERENCES 7 2.5 TRAFFIC CONTROL 1 7.4 GENERAL 7 2.6 STAGING AREA 1 7.5 MATERIALS 7 S 2.7 COORDINATION WITH OWNER AND OTHER 7.6 IN-STREAM STRUCTURES & TOE • CONTRACTORS 2 STABILIZATION 8 2.8 PROTECTION OF EXISTING FACILITIES, 7.7 CHANNEL PROTECTIVE LININGS 9 • STRUCTURES, AND SERVICES 2 7.8 SLOPE PROTECTION 9 2.9 PROTECTION OF INSTALLED WORK 2 2.10 PROGRESS CLEANING & WASTE REMOVAL 2 SECTION 8 - STREAM BANK PLANTING 10 11 2 EROSION CONTROL 2 . 2.12 FINAL CLEANING 2 8.1 SECTION INCLUDES 10 • 8.2 MEASUREMENT AND PAYMENT 10 SECTION 3 - QUALITY CONTROL 3 8.3 REFERENCES 10 • 8.4 GENERAL 10 3.1 SECTION INCLUDES 3 8.5 LIVE STAKES 10 3.2 MEASUREMENT AND PAYMENT 3 8.6 PLANT SUBSTITUTION 10 • 3.3 REFERENCES 3 8.7 PLANTING PREPARATION 10 3.4 CONSTRUCTION OBSERVATION 3 8.8 STREAM BANK PLANTING 10 • 3.5 PLANTING OBSERVATION 3 8.9 PLANTING PERIODS 10 8.10 REMOVAL OF NUISANCE VEGETATION 10 SECTION 4 - SITE PREPARATION 4 8.11 WATER FOR PLANTINGS 10 8 12 SUBMITTALS 11 4.1 SECTION INCLUDES 4 . • 4.2 MEASUREMENT AND PAYMENT 4 SECTION 9 - BUFFER PLANTING 11 4.3 UTILITY LOCATION AND PROTECTION 4 • 4.4 SEDIMENTATION AND EROSION CONTROL 4 9.1 SECTION INCLUDES 11 4.5 CONSTRUCTION LAYOUT 4 9.2 MEASUREMENT AND PAYMENT 11 4.6 CLEARING, GRUBBING, AND STRIPPING 4 9.3 REFERENCES 11 • 4.7 DEWATERING 4 9.4 GENERAL 11 9.5 CONTAINER GROWN PLANTS 12 • SECTION 5 - EXCAVATION 5 9.6 BARE ROOT PLANTS 12 9.7 PLANT SUBSTITUTION 12 5.1 SECTION INCLUDES 5 9.8 PLANTING PREPARATION 12 5.2 MEASUREMENT AND PAYMENT 5 9.9 PLANTING PERIODS 12 5.3 REFERENCES 5 9.10 REMOVAL OF NUISANCE VEGETATION 12 i 5.4 PREPARATION 5 9.11 WATER FOR PLANTINGS 12 5.5 EXCAVATING 5 9.12 SUBMITTALS 12 • 5.6 PLANTING PREPARATION 5 5.7 TOLERANCES 5 SECTION 10 - PERMANENT SEEDING 13 • SECTION 6 - FILLING, BACKFILLING AND COMPACTION 6 10.1 SECTION INCLUDES 13 10.2 MEASUREMENT AND PAYMENT 13 . 6.1 SECTION INCLUDES 6 10.3 REFERENCES 13 6.2 MEASUREMENT AND PAYMENT 6 10.4 GENERAL 13 6.3 REFERENCES 6 10.5 SEEDBED PREPARATION 13 • 11 • 10.6 SEEDING 10.7 SEEDING DATES • 10.8 SOIL AMENDMENTS 10.9 MULCH • SECTION i i - SEDIMENT & EROSION CONTROL • 11.1 SECTION INCLUDES 11.2 MEASUREMENT AND PAYMENT • 11.3 REFERENCES 13 11.4 MATERIALS 14 13 11.5 SILT FENCE 14 13 11.6 TEMPORARY SEEDING 15 14 SECTION 12 - SITE MAINTENANCE 15 14 12.1 SECTION INCLUDES 15 14 12.2 MEASUREMENT AND PAYMENT 15 14 12.3 EXECUTION 15 14 111 SECTION 1 - GENERAL REQUIREMENTS 1.1 SECTION INCLUDES General requirements and information related to the work including, summary of work, measurement and payment, and reference to SPECIAL CONTRACT PROVISIONS. 1.2 SUMMARY OF WORK The Watauga County Stream Repairs and Bank Stabilization project consists of the earthwork construction of repaired and stabilized channel banks, in-channel structure installation, toe stabilization, and/or planting of the repaired channel banks and surrounding buffer area. Refer to the Construction Drawings and to these Specifications for project details. 1.3 WORKFORCE EXPERIENCE The Contractor is required to have the appropriately experienced personnel on-site to operate equipment and insure that the construction sequence and installation procedures are followed as determined by the Engineer. Contractor personnel should be familiar with stream repair and bank stabilization techniques and the correct method of installing in-stream structures (i.e. rock cross-vanes). 1.4 SPECIFIC EQUIPMENT REQUIREMENTS The Contractor is required to have at a minimum two excavators with hydraulic thumbs during the entire course of construction unless otherwise approved by the Engineer. The hydraulic excavators must be of sufficient size to lift, manipulate, and install boulders larger than 5- foot by 4-foot by 3-foot (a maximum of 6 tons). 1.5 MEASUREMENT AND PAYMENT All measurement and payment for services performed shall be as indicated in the SPECIAL CONTRACT PROVISIONS. As such, they are not defined in these technical Specifications. END OF SECTION SECTION 2 - TEMPORARY FACILITIES 2.1 SECTION INCLUDES Required temporary facilities including site access, temporary sanitary facilities, barriers, traffic control, construction staging area, Contractor coordination, protection of existing facilities and installed work, erosion control measures, and general site cleaning. 2.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 2.3 TEMPORARY SANITARY FACILITIES Provide and maintain required sanitary facilities and enclosures. No permanent sanitary facilities exist at the project site. 2.4 BARRIERS Provide barriers to prevent unauthorized entry to construction areas, to allow for Owner and Engineer access to site, and to protect existing structures and adjacent properties from damage due to construction operations. 2.5 TRAFFIC CONTROL Provide traffic control as required to protect the public safety. Conform to all requirements of State, County, City, or local laws and requirements for traffic control. Conformance with Contract Documents does not relieve the Contractor from responsibility for public safety. Construction operations may be underway on adjoining portions of the site. 2.6 STAGING AREA The Owner will designate an area for staging of Contractor's equipment and construction materials for the duration of construction. This area shall be maintained so as to provide a sightly appearance and a safe working environment. No other area shall be used for this purpose without the approval of the Owner. Storage of oil or fuel shall be confined to the construction staging area. Refueling of all vehicles and equipment shall occur only in the staging area. Refueling of non-mobile equipment located outside of the staging area will be allowed with Owner approval. No refueling shall occur within fifty feet of the channel or any other surface water or wetland. The Contractor shall take appropriate measures to ensure safe fueling procedures are followed. Contractor shall provide appropriate spill prevention measures. The Contractor shall provide a spill containment plan for both the staging area and the construction area. The plan shall include prevention, containment, and control of fuel or oil spillage from equipment storage, refueling, maintenance, and operation on-site. The plan shall address both mobile and non-mobile equipment used during construction. Emergency spill cleanup equipment for oil and fuel spills shall be stored on-site. The Contractor shall notify the Owner and all applicable agencies within 24 hours of any spill. Stream Stabilization/Restoration Page 1 Technical Specifications 2.7 COORDINATION WITH OWNER AND OTHER CONTRACTORS • Perform coordination with Owner and schedule work to ensure limited disruption of daily operations. Obtain approval from Owner prior to the disruption of any access to site utilities, structures, or locations. Coordinate the disruption of any utility services without regard to • duration. Provide continuous representation/point of contact for Owner during all site activities. Access to construction-site shall be S limited to the entrance designated on the plans. Only access points • approved by the Owner shall be used during construction. • 2.8 PROTECTION OF EXISTING FACILITIES, STRUCTURES, AND SERVICES • The project vicinity, including existing access routes, will continue to be used for daily operations by Owner and other contractors throughout the duration of the construction. The Contractor shall protect existing facilities, structures, and services throughout the duration of • construction and provide special protection where specified in individual specification sections. Provide temporary and removable • protection for existing structures and services. Control activity in immediate vicinity of facilities, structures, and • services to prevent damage. Any facility, structure, or services disturbed or damaged, either intentionally or unintentionally, shall be • removed and reinstalled or repaired to the Owner's satisfaction. Repairs to or replacement of facilities, structures, or services shall be performed at the expense of the Contractor. Repairs and/or • replacement shall occur without additional cost to the Owner. • 2.9 PROTECTION OF INSTALLED WORK • Protect installed work and provide special protection where specified in • individual specification sections. Provide temporary and removable protection for installed work and products. Control activity in • immediate work area to prevent damage. Any installed work disturbed or damaged, shall be removed and reinstalled or repaired to the • Engineer's satisfaction. Repairs to or replacement of installed work shall be performed at the expense of the Contractor. Repairs and replacement shall occur without additional cost to the Owner. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2.10 PROGRESS CLEANING AND WASTE REMOVAL Maintain areas free of waste materials, debris, and rubbish. Maintain site in a clean and orderly condition. Collect and remove waste materials, debris, and rubbish from site daily and dispose off site. Remove temporary utilities, equipment, facilities, and materials prior to Final Application for Payment inspection. Restore existing facilities used during construction to original condition. 2.11 EROSION CONTROL Contractor shall be responsible for preventing erosion on the site and sedimentation off the site. Methods shall be employed as recommended in the North Carolina Erosion and Sediment Control Planning and Design Manual, latest edition. 2.12 FINAL CLEANING Execute final cleaning prior to final project assessment. Clean site and all installed work. Remove waste and surplus construction materials, rubbish, and construction facilities from the site. END OF SECTION Stream Stabilization/Restoration Page 2 Technical Specifications SECTION 3 - QUALITY CONTROL 3.1 SECTION INCLUDES Observation of construction operations and buffer and stream bank planting. 3.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS. Unless indicated otherwise, the Owner will arrange and pay for initial planting observation for quality assurance. Re-observation testing required because of non-conformance to plans or Specifications shall be charged against any money owed to Contractor. Contractor is encouraged to perform quality control checks and testing at Contractor's expense to reduce the possibility of rejected work. 3.3 REFERENCES For products or workmanship specified by association, trade, or other consensus, comply with requirements of the standard, except when more rigid requirements are specified or are required by applicable codes. Conform to reference standard by date of issue on date of Contract Documents, except where a specific date is established by code. Section 9 (Wetland and Buffer Planting) of these Specifications. 3.4 CONSTRUCTION OBSERVATION The Owner has engaged the Engineer to observe construction operations as required in these Specifications. Reports (either verbal or written) shall be submitted concurrently to the Owner and Contractor, indicating observations and indicating compliance or non-compliance with Contract Documents. Observation of construction operations does not relieve Contractor of obligation to perform work to contract requirements. The Contractor shall allow observation personnel access to materials and the construction-site as required. 3.5 PLANTING OBSERVATION The Owner has engaged the Engineer to observe stream bank and buffer planting as required in these Specifications. Reports will be submitted concurrently to the Owner and Contractor, indicating observations and indicating compliance or non-compliance with Contract Documents. Observation of planting operations does not relieve Contractor of obligation to perform work to contract requirements. The Contractor shall allow observation personnel access to materials (see stream bank plantings specified in Section 8) and the construction-site as required. Section 6 (Filling, Backfilling, and Compaction) of these Specifications. Section 8 (Stream Bank Planting) of these Specifications. END OF SECTION Stream Stabilization/Restoration Page 3 Technical Specifications • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • SECTION 4 - SITE PREPARATION 4.1 SECTION INCLUDES Site preparation shall consist of utility location and protection, clearing, grubbing and stripping of the work area, and construction of any required temporary construction access routes and temporary sediment and erosion control measures. 4.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 4.3 UTILITY LOCATION AND PROTECTION The Contractor shall locate all existing utilities and mark them for identification. Contractor shall provide means for protecting utilities from any damage during site work. Repair of damaged utilities shall be at the Contractor's expense. Coordination should be made with Owner to locate and mark site specific utilities. NC ONE CALL (1-800-632- 4949) 4.4 SEDIMENTATION AND EROSION CONTROL Contractor shall be responsible for preventing erosion on the site and sedimentation off the site. Methods shall be employed as recommended in the North Carolina Erosion and Sediment Control Planning and Design Manual, latest edition. The Contractor shall control sedimentation runoff with methods approved by the Engineer during the course of construction of this Project. Depending on the magnitude of the clearing and grubbing associated with the project, an Erosion Control Plan may be required Temporary erosion and sediment control measures shall be installed as described in Section 11 (Sediment & Erosion Control). The Contractor shall conform to all the rules, regulations, laws, and ordinances of the State of North Carolina, and of all other authorities having jurisdiction. 4.5 CONSTRUCTION LAYOUT The construction layout may include, but will not necessarily be limited to, channel disturbance limits, earthwork limits, and appropriate grading values. The Contractor is responsible for the construction surveying and layout. The Contractor is required to have a laser level or other equivalent equipment available on-site during the entire period of construction. 4.6 CLEARING, GRUBBING, AND STRIPPING Conform to applicable codes for environmental requirements, disposal of debris, and erosion and sedimentation control as described above. Coordinate clearing work with utility owners and operators as described above. Establish a schedule for daily removal of debris from the site. Debris may not be stockpiled on-site. Clear areas required for access to site and execution of work. Remove trees, stumps, other wood, metal, or rubble debris within work areas. Remove stumps, main root ball, and all roots with a diameter greater than 2 inches. Leave area in a clean and neat condition. Grade site surface daily to control the direction of channelized flow and prevent free standing surface water. In areas where bank repairs will be implemented, the existing top six inches of soil should be removed and stockpiled prior to excavation, construction, or reconstruction efforts. 4.7 DEWATERING Comply with all rules, regulations, laws, and ordinances of the State of North Carolina, and of all other authorities having jurisdiction. Provide, without additional cost to the Owner, all labor, materials, equipment, and services necessary to make the work comply with such requirements. Install all barriers, erosion and sedimentation control devices, silt fences, and other measures as required to prevent off'-site sedimentation. Grade and ditch the site as necessary to direct surface runoff away from open excavations and subgrade surfaces. All water drained from the Work shall be disposed of in a manner that will not result in undue interference with other work or damage adjacent properties, other surfaces, structures, and utilities. All water due to the dewatering operation shall be legally disposed of in accordance with all applicable State and federal regulations and other applicable regulations. Under no circumstances shall fill be placed in excavations containing standing water without approval of the Engineer. END OF SECTION Stream Stabilization/Restoration Page 4 Technical Specifications SECTION 5 - EXCAVATION 5.1 SECTION INCLUDES Provide all necessary equipment and labor to excavate for channel restoration without damage or interruption of utility service. 5.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 5.3 REFERENCES Occupational Safety and Health Administration - Construction Standards for Excavations, 29 CFR Part 1926.650-.652. When the Specifications or Drawings differ from the requirements of the above-referenced documents, the more stringent requirements shall apply. 5.4 PREPARATION Locate, identify, and protect utilities from damage as described in Section 4.3. Notify utility companies and coordinate for and/or install protection of utilities. 5.5 EXCAVATING Protect all utilities and structures that may be damaged by excavating work. In areas where stream and floodplain grading will be implemented, the existing top six inches of soil should be removed and stored prior to construction or reconstruction efforts. Perform Work in accordance with Occupational Safety and Health Administration (OSHA) - Construction Standards for Excavations, 29 CFR Part 1926.650-.652. Provide trench and excavation protection as required. Slope banks with machine to stable slope or flatter until shored. Grade top perimeter of excavation to prevent surface water from draining into excavation. Where required to protect utilities, perform excavation by hand. Remove subsoil, boulders, and rock as directed by the Engineer. Notify Engineer if subsurface conditions require excavation of larger subsoil, boulders, and rock, and discontinue Work. Engineer may direct adjustment in construction elevations. Adjustment of elevations shall not be a basis for additional payment. Correct areas over excavated in accordance with Section 6 (Filling, Backfilling, and Compaction) and as shown in the Construction Drawings. Stockpile select excavated material on-site for re-use in backfill. Stockpile location shall be subject to Owner approval. 5.6 PLANTING PREPARATION In areas where buffer planting will be implemented, the stockpiled topsoil and/or off-site topsoil (as required), should be distributed in preparation for restoration planting operations as described in SECTION 7 (Channel Protective Linings and In-stream Structures) of these Specifications. The Contractor is ultimately responsible for establishing a suitable planting medium with a minimum depth of six (6) inches. All areas where topsoil is distributed shall be disked or harrowed to ensure soil aeration and to increase the surface roughness prior to planting. 5.7 TOLERANCES Top surface of channel protective lining (where applicable): Plus or minus one inch from required elevations. Top surface of fill, backfill, and topsoil: Plus or minus one inch from required elevations. END OF SECTION Stream Stabilization/Restoration Page 5 Technical Specifications SECTION 6 - FILLING, BACKFILLING AND COMPACTION 6.1 SECTION INCLUDES Provide all necessary equipment and labor to perform filling, backfilling, and compaction necessary for construction of repaired channel banks, and other site work as shown on the Drawings without damage or interruption of utility service. Replacement of removed topsoil shall be as described in SECTION 5.6 (Planting Preparation) of these Specifications. 6.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 6.3 REFERENCES ASTM D698 - Test Methods for Moisture-Density Relations of Soils and Soil-Aggregate Mixtures, Using 5.5 lb. Rammer and 12-inch Drop. ASTM D1556 - Test Method for Density of Soil in Place by the Sand-Cone Method. ASTM D2922 - Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth). ASTM D3017 - Test Methods for Water Content of Soil and Rock in Place by Nuclear Methods (Shallow Depth). ASTM D2487 - Classification of Soils for Engineering Purposes. When the Specifications or Drawings differ from the requirements of the above-referenced documents, the more stringent requirements shall apply. 6.4 FILL MATERIALS Soil excavated during construction and stockpiled may be re-used as fill provided that it can be conditioned and compacted as specified. Supplement or replace excavated soils with channel bed material or ordinary fill as shown on the Drawings and as needed to complete work. Fill for Lower-Bank Zone shall consist of channel bed material from an approved borrow source. Ordinary fill for Mid-Bank and Upper-Bank Zones shall be any soil classified as SM, SC, SP-SM, SP- SC, SC-SM, SP, or SW under ASTM D2487 unless otherwise directed by the Engineer. . If soil excavated during cut operations is not re-used, it shall be removed from the site to an appropriate disposal facility at no additional charge to Owner. The Contractor shall be responsible for . the payment of all fees associated with transportation and disposal of unusable materials. Suitable borrow material may be available within the vicinity of the project site but must be identified by the Contractor and approved by the Engineer. 6.5 PREPARATION Compact subgrade to density requirements for subsequent backfill materials. Cut out soft areas of subgrade not capable of compaction in place. Backfill with ordinary fill material and compact to density equal to or greater than requirements for subsequent fill material. 6.6 BACKFILLING, FILLING, AND SURFACE PREPARATION Backfill areas to contours and elevations with unfrozen materials. Do not backfill over porous, frozen, or spongy subgrade surfaces. Employ a placement method that does not disturb or damage other work. Make gradual grade changes. Blend slope into level areas. Place Backfill and fill in loose level lifts not to exceed six inches in thickness before compaction. Make gradual grade changes. Blend slope into level areas. Earth fill in repaired channel banks and other structures shall be placed so as to meet the following additional requirements: a. The distribution of materials throughout each zone shall be essentially uniform and the fill shall be free from lenses, pockets, streaks, or layers of material differing substantially in texture or gradation from the surrounding materials. b. Backfill areas to contours and elevations with unfrozen materials. Do not backfill over porous, frozen, or spongy subgrade surfaces. Employ a placement method that does not disturb or damage other work. Place Backfill and fill in loose level lifts not to exceed six inches in thickness before compaction. Make gradual grade changes. Blend slope into level areas. c. If the surface of any layer becomes too hard and smooth for proper bond with the succeeding layer, it shall be scarified parallel to the axis of the fill to a depth of not less than 2 inches before the next layer is placed. d. The top surfaces of embankments shall be maintained approximately level during construction, except that a crown or cross-slope of not less than 2% shall be maintained to insure effective drainage, and except as otherwise specified for drain fill zones. e. Repaired channel banks shall be constructed so that the slope of the bonding surfaces between embankment in place and embankment to be placed is not steeper than 1 feet horizontal to 1 foot vertical, unless otherwise specified on the Contract Drawings. New embankment material shall be benched into existing slope as shown on the plans. Short bench levels shall be formed to a slope of 1H:1V or flatter, based on existing slope conditions as determined by the Engineer at the time of construction, unless otherwise specified on the Contract Drawings. Benching shall be constructed in such a fashion as to inhibit the formation of preferential planes of slope failure. The bonding surface of the embankment in place shall be stripped of all loose material, and shall be scarified, moistened and recompacted when the new fill is placed against it as needed to insure a good bond with the new fill and to obtain the specified moisture content and density in the junction of the in-place and new fill. Any variation to this method of tying new fill into the existing filled bank shall be determined in the field at time of construction by the Engineer. 6.7 COMPACTION AND QUALITY CONTROL For backfill operations, compaction shall be performed using tracked equipment as directed by the Engineer. Compaction greater than that provided by tracked equipment may be deemed necessary by the Stream Stabilization/Restoration Page 6 Technical Specifications Engineer based on-site or soil conditions. Provide compaction as directed by the Engineer. Lift thickness shall not exceed 6". 6.8 PROTECTION OF FINISHED WORK Protect finished work. Reshape and re-compact fills subjected to vehicular traffic or damaged by erosion. 6.9 TOLERANCES Top surface of channel protection lining (where applicable): Plus or minus one inch from required elevations. Top surface of fill, backfill, and topsoil: Plus or minus one inch from required elevations. Top surface of floodplain (where applicable): Plus or minus one inch from required elevations. END OF SECTION SECTION 7 - CHANNEL PROTECTIVE LININGS AND IN- STREAM STRUCTURES 7.1 SECTION INCLUDES Temporary and permanent channel erosion protective linings and in- stream rock and log structures. 7.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 7.3 REFERENCES The following specifications and methods form a part of this Specification: ASTM C88 - Standard Test Method for Soundness of Aggregates by Use of Sodium Sulfate or Magnesium Sulfate ASTM C 127 - Standard Test Method for Specific Gravity and Absorption of Coarse Aggregate NCDOT - Standard Specifications for Roads and Structures. When the Specifications or Drawings differ from the requirements of the above-referenced documents, the more stringent requirements shall apply. 7.4 GENERAL A Channel Protective Lining has been selected along channel banks. In-stream Structures will be installed to provide additional bank protection where shown on the Drawings. Materials to be used in Channel Protective Linings and the In-Stream Structures are specified in this section. Channel erosion protection linings shall be constructed of the materials specified in this section and as shown on the Drawings. Linings shall be laid true to the grade shown on the Drawings. Linings shall make a smooth interface with the surrounding grade. Any portion of the lining which has its grade or surface disturbed after placement shall be repaired. Any portion thereof already in place which is found to be defective or damaged shall be repaired or replaced, as directed by the Engineer, without additional cost to the Owner. The in-stream structures shall be constructed of the materials specified in this section and as shown on the Drawings. Any portion of the structure which is disturbed after placement shall be repaired. Any portion of the structure found to be defective or damaged shall be repaired or replaced, as directed by the Engineer, without additional cost to the Owner. 7.5 MATERIALS Materials include excelsior and coir fiber matting manufactured especially for erosion control, Eco-Stakes, wire staples, nonwoven geotextile, boulders, channel bed material, NCDOT Coarse Aggregate Size #57, NCDOT Class A Erosion Control Stone, NCDOT Class B Erosion Control Stone, NCDOT Class 1 Rip Rap (RipRap), and NCDOT Class 2 Rip Rap (RipRap). Stream Stabilization/Restoration Page 7 Technical Specifications s Matting for erosion control in areas other than stream banks with mild slopes shall be machine-produced 100% biodegradable mat with 100% straw fiber matrix with a functional longevity of approximately 12 months. The blanket shall be of consistent thickness with the straw evenly distributed over the entire area of the mat. The blanket shall be covered on the top side with 100% biodegradable woven natural organic fiber netting. The netting shall consist of machine directional stands formed from two intertwined yarns with cross directional strands interwoven through the twisted machine strands (commonly referred to as Leno weave) to form an approximate 0.50 x 1.00 inch (1.27 x 2.54 cm) mesh. The blanket shall be sewn together with biodegradable thread on 1.50 inch (3.81 cm) centers. The blanket shall be manufactured with a colored line of thread stitched along both outer edges (approximately 2-5 inches [5 - 12.5 cm] from the edge) to ensure proper material overlapping. The straw erosion control blanket shall be S75 BN as manufactured by North American Green, or equivalent. Erosion control blanket shall have the following properties Material Content Matrix 100% Straw Fiber (0.50 lbs/yd2) (0.27 kg/m2) Netting One side only, Leno woven 100% biodegradable natural organic fiber (9.30 lbs/1,000 ft' [4.50 kg/100m2] approximate weight) Thread Biodegradable Physical Specifications (per roll) English Metric Width 6.67 ft f 5% 2.03 in Length 108.00 ft f 5% 32.92 in Weight 46.401bs f 10% 21.05 kg Area 80 yd2 66.89 m2 Stitch Spacing 1.50 inches 3.81 cm Nonwoven Geotextile: Geotextile shall be a nonwoven fabric with a minimum weight of 12 ounces per square yard (ASTM D3776), a minimum grab strength in either direction of 180 pounds (ASTM D4632), a minimum puncture resistance of (ASTM D4833) of 85 pounds, and permeability of (ASTM D4491) greater than 0.2 cm/sec. Fabric meeting these Specifications shall still be subject to approval or rejection by the Engineer. At the time of installation, the fabric will be rejected if it has defects, rips, holes, flaws, deterioration, or damage incurred during the manufacture, transportation, or storage. NCDOT Coarse Aggregate Size #57: Shall conform to gradation requirements of Table 1005-1, NCDOT Specifications. NCDOT Class A Erosion Control Stone: 2 to 6-inch, widely graded, durable, crushed stone conforming to applicable NCDOT standards (No more than 5% of the material furnished can be less than the minimum size specified, nor more than 10% of the material can exceed the maximum size specified). Concrete rubble shall not be used. NCDOT Class B Erosion Control Stone: 5 to 12-inch, widely graded, durable, crushed stone conforming to applicable NCDOT standards (No more than 5% of the material furnished can be less than the minimum size specified, nor more than 10% of the material can exceed the maximum size specified). Concrete rubble shall not be used. NCDOT Class 1 Rip Rap (RipRap): 5 to 17-inch, widely graded, durable, crushed stone conforming to applicable NCDOT standards. The stone shall vary in weight from 5 to 200 pounds with 30% weighing a minimum of 60 pounds each and 10% weighing a minimum of 15 pounds each. (No more than 5% of the material furnished can be less than the minimum size specified, nor can more than 10% of the material exceed the maximum size specified). The rock fragments shall be angular to subrounded in shape. Concrete rubble shall not be used. NCDOT Class 2 Rip Rap (RipRap): 9 to 23-inch, widely graded, durable, crushed stone conforming to applicable NCDOT standards. The stone shall vary in weight from 25 to 250 pounds and 60% shall weigh a minimum of 100 pounds each. (No more than 5% of the material furnished can be less than the minimum size specified, nor can more than 10% of the material exceed the maximum size specified). The rock fragments shall be angular to subrounded in shape. Concrete rubble shall not be used. Boulders (Toe Stabilization and Footer Rocks): Boulders of approximate dimension 6' x 3' x 2' shall be individually picked by Contractor from the quarry or the on-site stockpile for use in in-stream structure construction. Boulders as small as 4' x 2' x 2' may be used; however, they shall not constitute more than 30% of the total boulders. Boulders shall be relatively flat on either side in the same dimension, preferably the long dimension and must have smooth ends. 7.6 IN-STREAM STRUCTURES & TOE STABILIZATION The work covered by this section consists of the construction of in- stream structures including J-hooks, cross-vane structures, and rock toe stabilization. The quantity of in-stream structures and length of toe stabilization to be constructed will be affected by actual conditions that occur during the construction of the project. The type and quantity of structures may be increased or decreased at the direction of the Engineer. Such variations in quantity will not be considered as alterations in the details of construction or a change of character of the work. A tracked hydraulic excavator with a thumb of sufficient size to move specified boulders is required for this item. Precise placement of structures will be determined during construction by the Engineer and may not reflect the construction Drawings. In-stream structures and toe stabilization installed must be inspected and approved by the Engineer. Excavation for the purpose of installation is incidental and is covered by this line item. The excavation of the subgrade and installation will be consecutive and continuous. Once the installation procedure has been initiated, it will be completed before the end of the workday. Any incidental/accidental discharge of sediment accumulation as a result of the installation procedure will be removed or integrated into the designed bedform. Excavation shall terminate at bedrock if contacted prior to the design grade. Bedrock will be excavated only if it is determined to be rippable and necessary by the Engineer. Install toe stabilization as shown on the Drawings and as directed by the Engineer. Grade area where toe stabilization is to be constructed. Surface shall be free of obstructions, debris, and pockets of soft or low density material. Unless otherwise directed by the Engineer, the stone shall be placed on the slope and/or angle as indicated on the plans. The stone shall be graded so that the smaller stones are uniformly Stream Stabilization/Restoration Page 8 Technical Specifications i distributed throughout the mass. The Contractor may place the stone by mechanical methods provided that when the work is completed, it forms a properly graded, dense, neat layer of stone. Place J-hooks and cross-vanes as shown on the Drawings. Footer rocks shall be installed to define shape of in-stream rock structures. Footer rocks shall be installed such that their long dimension is oriented in the direction of flow. No gaps shall be left between footer rocks. Minimum footer rock depth below the proposed ground surface of the stream bed shall be 4 feet. Rock sills shall extend a minimum of 3 feet beyond bankfull (perpendicular to stream flow) as indicated on plans. Geotextile shall be placed over structures and backfilled with aggregate as shown on plans. 7.7 CHANNEL PROTECTIVE LININGS Grade the area to be lined. Surface shall be free of obstructions, debris, and pockets of soft or low density material. The rock weir structures shall be completed prior to installation of the channel protective linings. Cover area with all available on-site stockpiled topsoil to a preferred minimum depth of 4 inches. Final grade with topsoil shall be as shown on Drawings. Topsoil shall be prepared with fertilizer and lime, and seeded as described in Section 10 (Permanent Seeding) of these Specifications. The Contractor is ultimately responsible for establishing a suitable planting medium with a minimum depth of six (6) inches. Install NA Green S75 BN erosion control matting perpendicular to the axis of the stream. The matting shall be laid smooth and free from tension, stress, folds, wrinkles and creases. Horizontal overlaps shall be a minimum of 12 inches with the upper matting overlapping the lower matting. Vertical overlaps in matting shall be a minimum of 12 inches with the upstream matting overlapping the downstream matting. The top (crest) edge of the matting shall be anchored in a trench at least 12 inches deep, as shown on the Construction Drawings, to prevent undercutting of the matting. The trench should be located a minimum of 12 inches from the top of bank, and shall not alter channel or floodplain grade. Matting trench and Eco-Stakes® shall be installed as shown on Drawings. Matting shall be anchored utilizing Eco-stake® brand stakes installed not more than 3 feet apart (3' on centers) and staggered, with a minimum of 3 stakes per square yard of matting over the entire lined area. 24-inch Eco-stakes® shall be used along the toe of the channel and 12-inch stakes shall be used within the field and top edge of the matting as detailed on the Construction Drawings. Along all laps (both vertical and horizontal) in the matting, install a common row of staples at the seam, installing staples on 1 foot (12 inch) centers. Along the toe, 24 inch Eco-Stakes® shall be spaced not more than 2 feet All stakes shall be driven perpendicular to the axis of the stream as shown on Drawings. Care shall be taken to avoid damage to matting material. In the event that the matting is displaced or damaged during installation, the matting shall be repositioned or replaced. This will be done at no additional cost to the Owner. 7.8 SLOPE PROTECTION Grade area to be lined. Surface shall be free of obstructions, debris, and pockets of soft or low density material. Cover area with all available on-site stockpiled topsoil to a preferred minimum depth of 4 inches. Final grade with topsoil shall be as shown on Drawings. Topsoil shall be prepared with fertilizer and lime, and seeded as described in Section 10 (Permanent Seeding) of these Specifications. The Contractor is ultimately responsible for establishing a suitable planting medium with a minimum depth of six (6) inches. Install excelsior matting perpendicular to slope. Matting shall be unrolled with netting material on top and blanket material in contact with the soil. (Note: some excelsior matting has netting on both sides.) The matting shall be laid smooth and free from tension, stress, folds, wrinkles and creases. Horizontal overlaps shall be a minimum of 12 inches with the upper matting overlapping the lower matting. Vertical overlaps in matting shall be a minimum of 12 inches. The top (crest) and bottom (toe) edges of the matting shall be anchored in trench at least 12 inches deep as shown on Drawings to prevent undercutting of the matting. Matting trench and wire staples shall be constructed and installed as shown on Drawings. Wire staples shall be installed not more than 3 feet apart (3' on centers) and staggered, with a minimum of 3 stakes per square yard of matting over the entire lined area. Staples shall be driven perpendicular to the soil surface. Staples shall be driven flush with soil surface to reduce potential for movement of the erosion control matting. Staples shall be installed in parallel rows on 3' centers and in trenches at the top and bottom of the slope as shown on Drawings. Along all laps (both vertical and horizontal) in the matting, install a common row of staples at the seam, installing staples on Ifoot (12 inch) centers. All standard anchoring staples shall be 18 inches in length. Staples shall be driven in with a wooden mallet. Care shall be taken to avoid damage to matting material. In the event that the matting is displaced or damaged during installation, the matting shall be repositioned or replaced. This will be done at no additional cost to the Owner. END OF SECTION Stream Stabilization/Restoration Page 9 Technical Specifications a 0 i SECTION 8 - STREAM BANK PLANTING 8.1 SECTION INCLUDES Provide all necessary equipment and labor to implement stream bank planting plan. 8.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 8.3 REFERENCES The following specifications and methods form a part of this Specification: NCDOT - Standard Specifications for Roads and Structures. 15 NCAC 213.200 - Classification of Water Quality Standards Applicable to Surface Waters & Wetlands of North Carolina The Baily Hortorium (1976 MacMillan Publishing Co., Inc.) American Standard for Nursery Stock, latest edition NCDENR - Erosion and Sediment Control Planning and Design Manual When the Specifications or Drawings differ from the requirements of the above-referenced documents, the more stringent requirements shall apply. 8.4 GENERAL All plants shall be as called for by these Specifications and shown on the Drawings. Botanical names referred to in the Drawings are taken from "Hortus Third", the Baily Hortorium (1976 MacMillan Publishing Co., Inc.). All plants delivered shall be true to name. Each plant, or group of the same species, variety, and size of plant, shall be legibly tagged with the name and size of the plant. All plants shall be first-class representatives of their species. Stakes shall be reasonably straight. All plants shall be free from plant diseases and insect pests. All shipments of plants shall comply with all nursery inspection and plant quarantine regulations of the States of origin and destination, as well as with Federal regulations governing interstate movement of stock. If stock from other States is used, the stock shall be accompanied by a tag or certificate stating, in effect, that the stock has been inspected and certified by an authorized official of the State of origin as apparently free from injurious plant pests. All plants shall be subject to inspection at any time by the Engineer Any such inspection before or during planting operations, however shall not be construed as final acceptance of the plants involved. 8.5 LIVE STAKES Live stakes, if approved for use by the Engineer, shall consist of freshly cut live plants of select stock which has been developed by proper cultural treatment. Stakes and cuttings shall be 3/8" to 1/2" diameter and between 12 and 18 inches long. They shall be carefully cut from mother-stock plantings. Plant materials shall be packaged, transported, and handled in a manner that will prevent injury, drying out, or freezing. 8.6 PLANT SUBSTITUTION No change in the specified plants (species, variety, size, caliper, furnish, etc.) will be made without written approval of the Engineer. All requests by the Contractor for substitutions shall be presented in writing and shall include a listing of the sources which have been contacted in an attempt to secure the specified plant material. Requests for substitutions shall include botanical name, common name, size, caliper, and furnish description of the proposed substitute. No increase in compensation will be made to the Contractor as a result of the use of the approved substitute plants. 8.7 PLANTING PREPARATION In areas where stream restoration will be implemented, preparation for restoration planting operations shall be as described in SECTION 7 (Channel Protective Linings) of these Specifications. Where live stakes shall be planted, through the Channel Protective Lining, holes shall be made by neatly punching a hole in the matting with a dibble bar (a heavy metal tool with a blade and a foot petal). The dimensions of the hole shall not exceed 3" in any direction and shall not damage the surrounding matting. 8.8 STREAM BANK PLANTING Where live stakes shall be planted, they shall be installed at a 45 to 60 degree angle in the direction of stream flow. The buds of stakes and plant cuttings should point upward and about 2 inches of wood should be exposed above the ground surface. Tamp the surrounding soil firmly to eliminate air pockets. Where stream bank planting is directed, areas shall be planted with trees and shrubs, using 6-foot by 6-foot centers as shown on the Construction Drawings. Care should be taken to avoid planting stakes too deep or too shallow, and to avoid damage to stakes during planting. Planting depth should be in accordance with listed references and supplier recommendations. 8.9 PLANTING PERIODS The installation of live stakes, bare root, or container grown plants shall be performed between October 1 and November 15, 2005. However, planting can not begin until all stream repairs have been completed. 8.10 REMOVAL OF NUISANCE VEGETATION Removal or control of nuisance vegetation shall be performed for a period of 90 days as necessary to ensure adequate survival of specified plant species. See SPECIAL CONTRACT PROVISIONS. 8.11 WATER FOR PLANTINGS The Contractor shall install a rain gage and collect daily gage readings at the site. Contractor shall provide initial watering on the day of planting and thereafter at a minimum rate of 1 inch per week (including rainfall) for a period of 90 days. Water used in the planting or care of Stream Stabilization/Restoration Page 10 Technical Specifications vegetation and plantings shall meet the requirements of Class C fresh waters as defined in 15 NAC 213.200. See SPECIAL CONTRACT PROVISIONS. 8.12 SUBMITTALS Contractor shall submit purchase certificates (or other proof) of all species planted. END OF SECTION Stream Stabilization/Restoration Page 11 SECTION 9 - BUFFER PLANTING 9.1 SECTION INCLUDES Provide all necessary equipment and labor to implement buffer planting plan. 9.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 9.3 REFERENCES The Baily Hortorium (1976 MacMillan Publishing Co., Inc.) American Standard for Nursery Stock, latest edition NCDENR - Erosion and Sediment Control Planning and Design Manual 15 NCAC 213.200 - Classification of Water Quality Standards Applicable to Surface Waters & Wetlands of North Carolina The following specifications and methods form a part of this Specification: NCDOT - Standard Specifications for Roads and Structures. When the Specifications or Drawings differ from the requirements of the above-referenced documents, the more stringent requirements shall apply. 9.4 GENERAL All plants shall be as called for by these Specifications. Bare rooted plants may be used in lieu of container grown plants provided written approval for such use has been obtained from the Engineer. Grading of plants, type and minimum dimensions of containers shall conform to the Specifications contained in the latest edition of American Standard for Nursery Stock. Plants shall not be cut back from larger sizes to meet sizes called for on the Drawings. Botanical names referred to in the Drawings are taken from "Hortus Third", the Baily Hortorium (1976 MacMillan Publishing Co., Inc.). All plants delivered shall be true to name. Each plant, or group of the same species, variety, and size of plant, shall be legibly tagged with the name and size of the plant. All plants shall be first-class representatives of their species. The root system shall be vigorous and well-developed. The branch systems shall be of normal development, and free from disfiguring knots, sun scald injuries, abrasions of the bark, dead or dry wood, broken terminal growth, or other objectionable disfigurements. Trees shall have reasonably straight stems, and shall be well branched and symmetrical in accordance with their natural habits of growth. All plants shall be free from plant diseases and insect pests. All shipments of plants shall comply with all nursery inspection and plant quarantine regulations of the States of origin and destination, as well as with Federal regulations governing interstate movement of nursery stock. If nursery stock from other States is used, the stock shall be accompanied by a tag or certificate stating, in effect, that the nursery Technical Specifications stock has been inspected and certified by an authorized official of the State of origin as apparently free from injurious plant pests. All plants shall be subject to inspection at any time by the Owner, Engineer, or a party to be named by the Owner. Any such inspection before or during planting operations, however shall not be construed as final acceptance of the plants involved. 9.5 CONTAINER GROWN PLANTS Container grown plants shall be healthy, vigorous, well-rooted, and shall have become established in the container in which they are delivered. These plants shall have been in the established container long enough for the fibrous roots to have developed so that the root mass will retain its shape and hold together when removed from the container. The container shall be a 1 gallon container or larger, sufficiently rigid to firmly hold the soil protecting the root during transporting, handling, and planting, and the soil shall not be allowed to become frozen. 9.6 BARE ROOT PLANTS Bare root plants, if approved for use by the Engineer, shall have a heavy fibrous root system which has been developed by proper cultural treatment. They shall be dug, packaged, transported, and handled in a manner that will prevent injury to or drying out of the trunks, branches, or roots, or freezing of the roots. 9.7 PLANT SUBSTITUTION No change in the specified plants (species, variety, size, caliper, furnish, etc.) will be made without written approval of the Engineer. All requests by the Contractor for substitutions shall be presented in writing and shall include a listing of the sources which have been contacted in an attempt to secure the specified plant material. Requests for substitutions shall include botanical name, common name, size, caliper, and furnish description of the proposed substitute. No increase in compensation will be made to the Contractor as a result of the use of the approved substitute plants. 9.8 PLANTING PREPARATION In areas where wetland and buffer planting will be implemented, preparation for planting operations shall be as described in SECTION 5.6 (Planting Preparation) of these Specifications. Where container grown plants will be planted, holes made in preparation for tree and shrub species planting shall be as shown on the Construction Drawings. Bare root plants and container-grown plants shall be planted in holes made by neatly punching a hole through slope protection matting and into existing grade with a dibble bar (a heavy metal tool with a blade and a foot petal). The dimensions of the hole shall not exceed 3" in any direction. 9.9 PLANTING PERIODS The installation of bare root and container grown plants shall be performed between October 1 and November 15, 2005. However, planting can not begin until all stream repairs have been completed. 9.10 REMOVAL OF NUISANCE VEGETATION Stream Stabilization/Restoration Page 12 Removal or control of nuisance vegetation shall be performed for a period of 90 days as necessary to ensure adequate survival of specified plant species. See SPECIAL CONTRACT PROVISIONS. 9.11 WATER FOR PLANTINGS The Contractor shall install a rain gage and collect daily gage readings at the site. Contractor shall provide initial watering on the day of planting and thereafter at a minimum rate of 1" per week (including rainfall) for a period of 90 days. Water used in the planting or care of vegetation and plantings shall meet the requirements of Class C fresh waters as defined in 15 NAC 2B.200. See SPECIAL CONTRACT PROVISIONS. 9.12 SUBMITTALS Contractor shall submit purchase certificates (or other proof) of all species planted. END OF SECTION Technical Specifications SECTION 10 -PERMANENT SEEDING 10.1 SECTION INCLUDES Permanent seeding for permanent site stabilization. 10.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 10.3 REFERENCES The following specifications and methods form a part of this Specification: NCDENR - Erosion and Sediment Control Planning and Design Manual When the Specifications or Drawings differ from the requirements of the above-referenced documents, the more stringent requirements shall apply. 10.4 GENERAL Permanent seeding shall be executed in temporary lined areas and all other areas which are disturbed during construction activities. In areas where Channel Protective Lining will be installed, seedbed preparation and seeding shall be performed prior to the placement of erosion control matting (See SECTION 7 - Channel Protective Linings). 10.5 SEEDBED PREPARATION Complete grading before topsoiling or preparing seedbeds. Avoid creating steep slopes. Excess stockpiled topsoil not used in construction of Channel Protective Lining shall be redistributed across areas to be seeded. Where topsoil is unavailable, seedbeds may be prepared directly on the exposed finished grade or topsoil may be imported. If topsoil is used, it should be spread to a uniform depth of four to six inches and bonded to the subsoil by loosening with a disc, harrow, or chisel plow. Areas where seeding will occur on exposed finished grade shall be disked or harrowed to ensure soil aeration and to increase the surface roughness prior to planting. Apply lime and fertilizer evenly across seedbed and work into the top 4-6 inches of soil by discing or other suitable means. Operate machinery on the contour. Rework the surface if soil becomes compacted or crusted prior to seeding. Complete seedbed preparation by breaking up large clods and raking into a smooth, uniform surface. Fill in or level depressions that can collect water. 10.6 SEEDING Apply permanent seeding to seedbed after preparation is complete. Use certified seed for permanent seeding whenever possible. Certified seed is inspected by the North Carolina Crop Improvement Association. It meets published North Carolina Standards and should bear an official "Certified Seed" label. Broadcast seed into a freshly loosened seedbed that has not been settled by rainfall. Mulch must be used on slopes 4H:1 V or steeper and in areas when concentrated water may flow. Anchor mulch with netting in areas subject to concentrated flow. In areas where Channel Protective Lining will be installed, no mulch shall be used and erosion control matting shall be placed within 24 hours of seeding. Apply seeds and mulch at the rates indicated below. Areas with Channel Protective Linings: Species Rate Obs/acre) Big Bluestem 4 (Andorpogon geradii) Little Bluestein 4 (Schizachyrium scoparium) Indian Grass 4 (Sorghastrum nutans) Switch Grass 4 (Panicum virgatum) Purple Love Grass 3 (Eragrostis spectabilis) Deer Tongue 3 (Panicum clandestinum) Purple Top 3 (Tridens flavus) All other disturbed areas: Species Rate 0s/acre) Big Bluestem 4 (Andorpogon geradii) Little Bluestein 4 (Schizachyrium scoparium) Indian Grass 4 (Sorghastrum nutans) Switch Grass 4 (Panicum virgatum) Purple Love Grass 3 (Eragrostis spectabilis) Deer Tongue 3 (Panicum clandestinum) Purple Top 3 (Tridens flavus) Mulch Rate (lbs11000 sq. Grain Straw 70 10.7 SEEDING DATES Seeding dates given in these Seeding Specifications have the best probability of success. Best Possible Late winter 15 Feb-15 Mar I Dec-15 Mar Late Fall 1 Sept-30 Sept 1 Oct-30 Nov Seeding shall be completed within the "possible" range of dates. 10.8 SOIL AMENDMENTS Apply lime and fertilizer according to soil tests, or apply 2 tons/acre (4,000 lb/acre) ground agricultural limestone and 1,000 lb/acre 5-10-10 fertilizer, or as directed by the Engineer. Stream Stabilization/Restoration Page 13 Technical Specifications 10.9 MULCH Apply grain straw, or equivalent cover of another suitable mulching material as described above. Anchor mulch by roving or netting. Netting shall be used on slopes steeper than 2H:1 V. END OF SECTION SECTION 11 - SEDIMENT & EROSION CONTROL 11.1 SECTION INCLUDES Installation of temporary sediment and erosion control measures to include installation of silt fence and temporary seeding measures. The Contractor shall maintain these measures to ensure proper structure function and vigorous temporary vegetative cover during construction. 11.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 11.3 REFERENCES The following specifications and methods form a part of this Specification: ASTM D4355 - Standard Test Method for Deterioration of Geotextiles from Exposure to Ultraviolet Light and Water (Xenon-Arc Type Apparatus) ASTM D4632 - Standard Test Method for Grab Breaking Load and Elongation of Geotextiles ASTM D4751 - Standard Test Method for Determining Apparent Opening Size of a Geotextile NCDENR - Erosion and Sediment Control Planning and Design Manual When the Specifications or Drawings differ from the requirements of the above-referenced documents, the more stringent requirements shall apply. 11.4 MATERIALS Silt Fence: Silt fence shall have steel posts, woven wire fabric, and filter fabric. The steel post shall have a minimum length of 5' and minimum width of 13/4". The steel posts shall have projections for fastening the wire to the fence. The woven wire fabric shall be at lest 32 inches high, and shall have at least 6 horizontal wires. Vertical wires shall be spaced a maximum of 12 inches apart. The top and bottom wires shall be at least 10 gauge. All other wires shall be at least 12'/z gauge. The silt fence filter fabric shall meet the following minimum criteria: Grab Tensile Strength 100 lbs. Grab Tensile Elongation 15% UV Resistance 70% Apparent Opening Size (AOS) 20 (US Sieve) 11.5 SILT FENCE The Contractor shall provide all labor, materials, tools and other items necessary to furnish and install the silt fence as shown on the Drawings and specified herein. The silt fence shall be placed following the contours as closely as possible. The ends of the silt fence shall be turned uphill. The posts shall not exceed a spacing of 8 feet. The posts shall be driven into the ground and shall extend above ground as shown on the Stream Stabilization/Restoration Page 14 Technical Specifications • Drawings. The filter fabric shall be stapled or wired to each post. The filter fabric shall extend into the ground as shown in the Drawings. • If possible, the filter fabric shall be cut from a continuous roll to avoid the use of joints. When joints are necessary, securely fasten the filter • cloth only at a support with overlap to the next post. Silt fences shall be inspected weekly and after each significant storm (1 inch in 24 hrs.). Any required repairs shall be made immediately. Sediment shall be removed when it reaches 1/3 the height of the fence or 9 inches maximum. Dispose of the sediment in the designated disposal area. 11.6 TEMPORARY SEEDING • The Contractor shall provide all labor, materials, tools, and other items necessary to provide temporary seeding in accordance with State and • local Standards. • Areas where no substantial or significant progress is made for more than 15 days shall be temporarily seeded as shown on the Drawings and specified herein. All areas must be seeded, mulched, and anchored • unless written approval is granted by the Owner. Incidental grading shall not constitute substantial or significant progress in construction • activity. Seeding and mulching shall be done immediately following construction. All disturbed areas shall be dressed to a depth of 8 inches. The top 3 inches shall be pulverized to provide a uniform seedbed. Agricultural lime shall be applied at a rate of 2,000 pounds per acre immediately before plowing. Grass seed shall be applied at the following rate: Type Dates Possible Rate Rye (Grain) Aug. 15 - May 1 60 lbs./ac. German Millet MayI -Aug 15 40 lbs./ac. 10-10-10 fertilizer shall be applied to all disturbed areas at a rate of 750 pounds per acre, and mulching shall consist of small grain straw applied a rate of 70 pounds per 1000 square feet (70lbs./ I 000sq.ft.). Mulch shall be anchored by roving or netting. END OF SECTION SECTION 12 - SITE MAINTENANCE 12.1 SECTION INCLUDES Site maintenance to ensure vigorous vegetative cover, stable channel lining, and durability of the work. 12.2 MEASUREMENT AND PAYMENT See SPECIAL CONTRACT PROVISIONS 12.3 EXECUTION Contractor shall revisit the site as required in the special contract provisions to inspect the condition of the project site. Areas of erosion, settlement, poor vegetative cover, and displaced coir or excelsior materials or in-stream structures, shall be repaired. Site visits shall be coordinated with Owner. Erosion areas shall be filled and reseeded in accordance with Section 10 - Permanent Seeding. Areas of poor vegetative cover shall be reseeded and refertilized only. Displaced, damaged, or dead shrub species shall be removed, and replanted in accordance with Sections 8 & 9 - Stream Bank Planting and Buffer Planting. Displaced channel lining materials shall be recovered (if possible) and replaced, or replaced with new channel lining materials to the design line and grade. 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J W 2 f z> Y W Z r:' / C3 r Q Ld ZNEa' W q J x W W WN~ W W Z Z Z L r ( J J ?- a Q N w 1 I_ v, x . W Z J VIN ~ H W N W q ?? .K oozm NH W U a f w , w W W yF?w°o ¢ 7 D ? s Ua ww N J O l7 jq U Li, -J U w Wxy?(Y ¢ Ld Qm wJJ3.W.?° l. . v v? q q -J v ~ Z .: N (7 Y z J O O?V aLLM w ?- O~ ZZZ O O U V m U • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • i Black Mountain Greenway Trail: Stream Enhancement November 12, 2008 Buncombe County McGill Associates, P.A. APPENDIX C SECTION 404 / SECTION 401 PERMIT APPLICATION iii • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 0 Office Use Only: Form Version March 05 08-1704 USACE Action ID No. DWQ No. (If any particular item is not applicable to this project, please enter "Not Applicable" or "N/A".) 1. Processing AID 1. Check all of the approval(s) requested for this project: Section 404 Permit ? Riparian or Watershed Buffer Rules Section 10 Permit ? Isolated Wetland Permit from DWQ 401 Water Quality Certification ? Express 401 Water Quality Certification 2. Nationwide, Regional or General Permit Number(s) Requested: NW 18 3. If this notification is solely a courtesy copy because written approval for the 401 Certification is not required, check here: ? 4. If payment into the North Carolina Ecosystem Enhancement Program (NCEEP) is proposed for mitigation of impacts, attach the acceptance letter from NCEEP, complete section VIII, and check here: ? 5. If your project is located in any of North Carolina's twenty coastal counties (listed on page 4), and the project is within a North Carolina Division of Coastal Management Area of Environmental Concern (see the top of page 2 for further details), check here: ? D \"? II. Applicant Information N0? ? ? ??08 1. Owner/Applicant Information Name: Elizabeth Teague, Planning Director nENR w?'TMWA RBCN ?,NOs Mailing Address: 106 Montreat Road Black Mountain, NC 28721 Telephone Number: 828-669-9784 Fax Number: 828-669-2030 E-mail Address: Elizabeth.Tea uegTownofBlackMountain.org 2. Agent/Consultant Information (A signed and dated copy of the Agent Authorization letter must be attached if the Agent has signatory authority for the owner/applicant.) Name: J.P. Johns, PE Company Affiliation: McGill Associates, P.A. Mailing Address: 420 East Park Avenue Ste. 305 Greenville, SC 29607 Telephone Number: 864-235-6759 Fax Number: 864-235-6766 E-mail Address: ipiohnsAmc illengineers.com Page 5 of 13 9 III. Project Information 0 Attach a vicinity map clearly showing the location of the property with respect to local 0 landmarks such as towns, rivers, and roads. Also provide a detailed site plan showing property 0 boundaries and development plans in relation to surrounding properties. Both the vicinity map • and site plan must include a scale and north arrow. The specific footprints of all buildings, impervious surfaces, or other facilities must be included. If possible, the maps and plans should include the appropriate USGS Topographic Quad Map and NRCS Soil Survey with the property boundaries outlined. Plan drawings, or other maps may be included at the applicant's discretion, • so long as the property is clearly defined. For administrative and distribution purposes, the USACE requires information to be submitted on sheets no larger than 11 by 17-inch format; however, DWQ may accept paperwork of any size. DWQ prefers full-size construction drawings rather than a sequential sheet version of the full-size plans. If full-size plans are reduced to a small scale such that the final version is illegible, the applicant will be informed that • the project has been placed on hold until decipherable maps are provided. 1. Name of project: Greenway Trail: Stream Enhancement for Town of Black Mountain 2. T.I.P. Project Number or State Project Number (NCDOT Only): N/A 3. Property Identification Number (Tax PIN): In Right-of-Way for Norfolk Southern Rail Road 4. Location County: Buncombe County Nearest Town: Black Mountain, NC Subdivision name (include phase/lot number): N/A Directions to site (include road numbers/names, landmarks, etc.): From Asheville, NC: Merge onto I-240 E. Take the US-70 exit, EXIT 7. Keep LEFT at the fork in the ramp. • Keep LEFT at the fork in the ramp. Keep RIGHT at the fork in the ramp. Turn SLIGHT RIGHT onto TUNNEL RD/US-70. Continue to follow US-70. Turn RIGHT onto S DOUGHERTY ST. S DOUGHERTY ST becomes SUTTON AVE. Turn LEFT onto S RIDGEWAY AVE. After you cross Broadway Street, there will be Black Mountain Farmers • Market straight ahead. Pull into the gravel parking lot to the right of the building. • 5. Site coordinates (For linear projects, such as a road or utility line, attach a sheet that separately lists the coordinates for each crossing of a distinct waterbody.) Decimal Degrees (6 digits minimum): 35°37'01.76" °N 87°18'58.87" °W • 6. Property size (acres): 0.5 7. Name of nearest receiving body of water: Swannanoa River • 8. River Basin: French Broad River Basin (Note - this must be one of North Carolina's seventeen designated major river basins. The River Basin map is available at http://h2o.enr.state.nc.us/admin/mgps/.) Page 6 of 13 0 9. Describe the existing conditions on the site and general land use in the vicinity of the project • at the time of this application: The project site is approximately 100 feet in length located along the Swannanoa River in Black Mountain, NC. Currently the river channel runs under a Norfolk Southern rail-road crossing and is largely obstructed during base flow conditions due to rock/boulder rubble that was apparently placed in the river into protect an abandoned • exposed sewer line running parallel to the Swannanoa River. The rock rubble has backed up normal flow conditions upstream causing portions of the channel to aggrade with fine silt, unlike typical mountain streams/rivers found in the area with rocky bottoms. The existing stream banks appear to be fairly stable through the project reach, but a lack of suitable buffer • is evident alon tipper portions on the downstream right hand side where the landscape is dotted with residential development. 10. Describe the overall project in detail, including the type of equipment to be used: Refer to • the attached report provided for a complete description. 11. Explain the purpose of the proposed work: The purpose of this project is to construct a reg enway trail boardwalk underneath a Norfolk Southern rail road trussel along the Swannanoa River adjacent to down-town Black Mountain, North Carolina. In addition, the • project includes the removal of an abandoned sewer line running parallel to the Swannanoa river as well as rock rubble that was placed in the stream section. A boulder cross-vane will be installed upstream of the rely trail boardwalk in order to manage stream flows more efficiently through the rail road trussel and establish grade control for the site while • improving water quality. IV. Prior Project History • If jurisdictional determinations and/or permits have been requested and/or obtained for this project (including all prior phases of the same subdivision) in the past, please explain. Include the USACE Action ID Number, DWQ Project Number, application date, and date permits and certifications were issued or withdrawn. Provide photocopies of previously issued permits, • certifications or other useful information. Describe previously approved wetland, stream and buffer impacts, along with associated mitigation (where applicable). If this is a NCDOT project, list and describe permits issued for prior segments of the same T.I.P. project, along with construction schedules. N/A V. Future Project Plans • Are any future permit requests anticipated for this project? If so, describe the anticipated work, and provide justification for the exclusion of this work from the current application. N/A Page 7 of 13 VI. Proposed Impacts to Waters of the United States/Waters of the State It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to wetlands, open water, and stream channels associated with the project. Each impact must be listed separately in the tables below (e.g., culvert installation should be listed separately from riprap dissipater pads). Be sure to indicate if an impact is temporary. All proposed impacts, permanent and temporary, must be listed, and must be labeled and clearly identifiable on an accompanying site plan. All wetlands and waters, and all streams (intermittent and perennial) should be shown on a delineation map, whether or not impacts are proposed to these systems. Wetland and stream evaluation and delineation forms should be included as appropriate. Photographs may be included at the applicant's discretion. If this proposed impact is strictly for wetland or stream mitigation, list and describe the impact in Section VIII below. If additional space is needed for listing or description, please attach a separate sheet. 1. Provide a written description of the proposed impacts: Refer to the attached report provided for a complete description. 2. Individually list wetland impacts. Types of impacts include, but are not limited to mechanized clearing, grading, fill, excavation, flooding, ditching/drainage, etc. For dams, separately list impacts due to both structure and flooding. Wetland Impact Site Number (indicate on map) Type of Impact Type of Wetland (e.g., forested, marsh, herbaceous, bog, etc.) Located within 100-year Floodplain (yes/no ) Distance to Nearest Stream (linear feet) Area of Impact (acres) Total Wetland Impact (acres) 3. List the total acreage (estimated) of all existing wetlands on the property: 0.0 4. Individually list all intermittent and perennial stream impacts. Be sure to identify temporary impacts. Stream impacts include, but are not limited to placement of fill or culverts, dam construction, flooding, relocation, stabilization activities (e.g., cement walls, rip-rap, crib walls, gabions, etc.), excavation, ditching/straightening, etc. If stream relocation is proposed, plans and profiles showing the linear footprint for both the original and relocated streams must be included. To calculate acreage, multiply length X width, then divide by 43,560. Page 8 of 13 Stream Impact Number (indicate on ma) Stream Name Type of Impact Perennial or Intermittent? Average Stream Width Before Impact Impact Length (linear feet) Area of Impact (acres) 1 Swannanoa River Stream Enhancement Perennial 40 Feet Ap pr0ox. 10 0.30 Total Stream Impact (by length and acreage) 100 0.10 5. Individually list all open water impacts (including lakes, ponds, estuaries, sounds, Atlantic Ocean and any other water of the U.S.). Open water impacts include, but are not limited to fill, excavation, dredainQ. flooding. drainage. bulkheads. etc. Open Water Impact Site Number (indicate on ma) Name of Waterbody (if applicable) Type of Impact Type of Waterbody (lake, pond, estuary, sound, bay, ocean, etc.) Area of Impact (acres) Total Open Water Impact (acres) 6. List the cumulative impact to all Waters of the U.S. resulting from the nroiect: Stream Impact (acres): 0.10 Wetland Impact (acres): Open Water Impact (acres): Total Impact to Waters of the U.S. (acres) 0.10 Total Stream Impact (linear feet): 100 7. Isolated Waters Do any isolated waters exist on the property? ? Yes M No Describe all impacts to isolated waters, and include the type of water (wetland or stream) and the size of the proposed impact (acres or linear feet). Please note that this section only applies to waters that have specifically been determined to be isolated by the USACE. 8. Pond Creation If construction of a pond is proposed, associated wetland and stream impacts should be included above in the wetland and stream impact sections. Also, the proposed pond should be described here and illustrated on any maps included with this application. Pond to be created in (check all that apply): ? uplands ? stream ? wetlands Describe the method of construction (e.g., dam/embankment, excavation, installation of draw-down valve or spillway, etc.): Page 9 of 13 Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond, local stormwater requirement, etc.): Current land use in the vicinity of the pond: Size of watershed draining to pond: Expected pond surface area: • VII. Impact Justification (Avoidance and Minimization) Specifically describe measures taken to avoid the proposed impacts. It may be useful to provide information related to site constraints such as topography, building ordinances, accessibility, and • financial viability of the project. The applicant may attach drawings of alternative, lower-impact • site layouts, and explain why these design options were not feasible. Also discuss how impacts were minimized once the desired site plan was developed. If applicable, discuss construction techniques to be followed during construction to reduce impacts. With the continuing undercutting of stream banks and the desire to link the Black Mountain reg enwa trail system • along the Swannanoa River underneath the Norfolk Southern Rail Road, all efforts have been made in order to minimize the surrounding impact to the Swannanoa River. After consulting with representatives from the US Army Colps., NC DWQ and NCWRC, it was determined that the reg enway trail boardwalk would be raised as high as possible to minimize the potential • impact for bed-load transport. The boardwalk will be raised to a height equal to the Q5-year storm event of WSEL: 2348.55 feet. The top of the boardwalk will sit at Elevation: 2349.00 feet and the low cord of will be at Elevation: 2347.9 feet. To meet NC ADA and DOT standards, the boardwalk will have a maximum width of six (6) feet. VIII. Mitigation DWQ - In accordance with 15A NCAC 2H .0500, mitigation may be required by the NC Division of Water Quality for projects involving greater than or equal to one acre of impacts to • freshwater wetlands or greater than or equal to 150 linear feet of total impacts to perennial streams. USACE - In accordance with the Final Notice of Issuance and Modification of Nationwide Permits, published in the Federal Register on January 15, 2002, mitigation will be required when necessary to ensure that adverse effects to the aquatic environment are minimal. Factors including size and type of proposed impact and function and relative value of the impacted aquatic resource will be considered in determining acceptability of appropriate and practicable mitigation as proposed. Examples of mitigation that may be appropriate and practicable include, but are not limited to: reducing the size of the project; establishing and maintaining wetland and/or upland vegetated buffers to protect open waters such as streams; and replacing losses of aquatic resource functions and values by creating, restoring, enhancing, or preserving similar functions and values, preferable in the same watershed. If mitigation is required for this project, a copy of the mitigation plan must be attached in order for USACE or DWQ to consider the application complete for processing. Any application lacking a required mitigation plan or NCEEP concurrence shall be placed on hold as incomplete. • An applicant may also choose to review the current guidelines for stream restoration in DWQ's Draft Technical Guide for Stream Work in North Carolina, available at http://h2o.enr.state.nc.us/ncwetlands/stnngide.html. Page 10 of 13 i 1. Provide a brief description of the proposed mitigation plan. The description should provide as much information as possible, including, but not limited to: site location (attach directions and/or map, if offsite), affected stream and river basin, type and amount (acreage/linear feet) of mitigation proposed (restoration, enhancement, creation, or preservation), a plan view, preservation mechanism (e.g., deed restrictions, conservation easement, etc.), and a description of the current site conditions and proposed method of construction. Please attach a separate sheet if more space is needed. On-site mitigation is to be performed by way of the removal of an abandoned sewer line and rock/boulder rubble used to protect the aforementioned sewer line. A boulder cross-vane will be placed upstream of the rail road crossing in an effort to move sheer forces away from the outside meander bend and protect surrounding vegetation from being undercut. All disturbed areas will be stabilized with bio-degradable turf reinforcement matting and planted with native vegetation. 2. Mitigation may also be made by payment into the North Carolina Ecosystem Enhancement Program (NCEEP). Please note it is the applicant's responsibility to contact the NCEEP at (919) 715-0476 to determine availability, and written approval from the NCEEP indicating that they are will to accept payment for the mitigation must be attached to this form. For additional information regarding the application process for the NCEEP, check the NCEEP website at http://h2o.enr.state.nc.us/v;rp/index.htm. If use of the NCEEP is proposed, please check the appropriate box on page five and provide the following information: Amount of stream mitigation requested (linear feet): Amount of buffer mitigation requested (square feet): Amount of Riparian wetland mitigation requested (acres): Amount of Non-riparian wetland mitigation requested (acres): Amount of Coastal wetland mitigation requested (acres): IX. Environmental Documentation (required by DWQ) 1. Does the project involve an expenditure of ii l ic (federal/state/local) funds or the use of public (federal/state) land? Yes No ? 2. If yes, does the project require preparation of an environmental document pursuant to the requirements of the National or North Carolina Environmental Policy Act (NEPA/SEPA)? Note: If you are not sure whether a NEPA/SEPA document is required, call the SEPA coordinator at (919) 733-5083 to review current thresholds for environmental documentation. Yes ? No 0 3. If yes, has the document review been finalized by the State Clearinghouse? If so, please attach a copy of the NEPA or SEPA final approval letter. Yes ? No ? X. Proposed Impacts on Riparian and Watershed Buffers (required by DWQ) It is the applicant's (or agent's) responsibility to determine, delineate and map all impacts to required state and local buffers associated with the project. The applicant must also provide justification for these impacts in Section VII above. All proposed impacts must be listed herein, Page 11 of 13 and must be clearly identifiable on the accompanying site plan. All buffers must be shown on a • map, whether or not impacts are proposed to the buffers. Correspondence from the DWQ Regional Office may be included as appropriate. Photographs may also be included at the applicant's discretion. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1. Will the project impact protected riparian buffers identified within 15A NCAC 2B .0233 (Meuse), 15A NCAC 2B .0259 (Tar-Pamlico), 15A NCAC 02B .0243 (Catawba) 15A NCAC 2B .0250 (Randleman Rules and Water Supply Buffer Requirements), or other (please identify )? Yes ? No N 2. If "yes", identify the square feet and acreage of impact to each zone of the riparian buffers. If buffer mitigation is required calculate the required amount of mitigation by applying the buffer multipliers. Zone* Impact (square feet) Multiplier Required Mitigation 1 3 (2 for Catawba) 2 1.5 Total T Lone i extenas out 3U teet perpendicular trom the top of the near bank of channel; Zone 2 extends an additional 20 feet from the edge of Zone 1. 3. If buffer mitigation is required, please discuss what type of mitigation is proposed (i.e., Donation of Property, Riparian Buffer Restoration / Enhancement, or Payment into the Riparian Buffer Restoration Fund). Please attach all appropriate information as identified within 15A NCAC 2B .0242 or .0244, or .0260. XI. Stormwater (required by DWQ) Describe impervious acreage (existing and proposed) versus total acreage on the site. Discuss stormwater controls proposed in order to protect surface waters and wetlands downstream from the property. If percent impervious surface exceeds 20%, please provide calculations demonstrating total proposed impervious level. N/A Sewage Disposal (required by DWQ) Clearly detail the ultimate treatment methods and disposition (non-discharge or discharge) of wastewater generated from the proposed project, or available capacity of the subject facility. XII. Violations (required by DWQ) Is this site in violation of DWQ Wetland Rules (15A NCAC 2H .0500) or any Buffer Rules? Yes ? No N Is this an after-the-fact permit application? Yes ? No 0 Page 12 of 13 0 0 0 0 0 0 0 0 0 0 0 0 • 0 0 • 0 0 s • • • • • • • • • • • • 0 0 XIII. Cumulative Impacts (required by DWQ) Will this project (based on past and reasonably anticipated future impacts) result in additional development, which could impact nearby downstream water quality? Yes ? No 0 If yes, please submit a qualitative or quantitative cumulative impact analysis in accordance with the most recent North Carolina Division of Water Quality policy posted on our website at http://h2o.enr.state.nc.us/ncwetlands. If no, please provide a short narrative description: There is no further proposed development for this portion of the site. XIV. Other Circumstances (Optional): It is the applicant's responsibility to submit the application sufficiently in advance of desired construction dates to allow processing time for these permits. However, an applicant may choose to list constraints associated with construction or sequencing that may impose limits on work schedules (e.g., draw-down schedules for lakes, dates associated with Endangered and Threatened Species, accessibility problems, or other issues outside of the applicant's control). (Agent's signature is valid only if an authorization letter from the applicant is provided.) Page 13 of 13 i ... }�� k. .i. Jam^"- � z •�: � � .�� "p S r T } pr •, i, wAh Jw , s � r • `• r44 low �� ♦' " `Sr r • �Z � �'� . ° � �z SEN- _,� �.+,* l " w f' Cyt A}li " g e � JkL t Project Site • 4'�%�- 03 • J 4 ••qa3 G" " • } PNG� z // Town of Black Mountain: Greenway Trail Location Map 0 125 250 500 0IMcGM • Feet ASS0CIATFS • • USGS Map 0 250 500 1,000 @MCGiH Feet ASSOCIATES 0 Town of Black Mountain: Greenway Trail