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HomeMy WebLinkAbout20140338 Ver 1_Final Mitigation Plan 8-3-15_20150825 Mitigation Plan FINAL JULY 31, 2015 Maney Farm Mitigation Project Chatham County, NC DENR Contract No. 005793 DMS ID No. 96314 Cape Fear River Basin HUC 03030002 PREPARED BY: 312 West Millbrook Road Suite 225 Raleigh, NC 27609 PREPARED FOR: NC Department of Environment and Natural Resources Division of Mitigation Services 1652 Mail Service Center Raleigh, NC 27699-1652 FINAL MITIGATION PLAN Maney Farm Mitigation Project Chatham County, NC DENR Contract No. 005793 DMS ID No. 96314 Cape Fear River Basin HUC 03030002 PREPARED FOR: NC Department of Environment and Natural Resources Division of Mitigation Services 1652 Mail Service Center Raleigh, NC 27699-1652 PREPARED BY: Wildlands Engineering, Inc. 312 W Millbrook Rd, Suite 225 Raleigh, NC 27609 Phone: 919-851-9986 JULY 31, 2015 Maney Farm Mitigation Project Final Mitigation Plan Page ii EXECUTIVE SUMMARY Wildlands Engineering, Inc. is completing a full delivery project at the Many Farm Mitigation Site (Site) in Chatham County, North Carolina. The stream restoration and enhancement project is sponsored by the North Carolina Division of Mitigation Services (DMS) and will improve a total of 6,092 linear feet of perennial and intermittent stream and generate 4,922 stream mitigation units. The streams proposed for restoration and enhancement are all unnamed tributaries (UT) to South Fork Cane Creek (SF) and are referred to herein as UTSF, UT1, UT2, UT3, UT4, and UT5. This site is located in the Cape Fear River Basin 8-Digit Hydrologic Unit Code (HUC) 03030002. The Site is also within the Cane Creek Targeted Local Watershed (HUC 03030002050050), which flows into Cane Creek and eventually into the Haw River. The proposed Site is located within the Cane Creek Targeted Local Watershed (TLW) which is discussed in NCDMS’s 2009 Cape Fear River Basin Restoration Priorities (RBRP). This document identifies the need to improve aquatic conditions and habitats as well as promoting good riparian conditions in the Cane Creek watershed and notes that there are currently 51 active animal operations in the watershed. The Maney Farm Site is currently maintained as cattle pasture and is one of the 51 animal operations referenced in the RBRP. The Site drains to the Haw River, which flows to B. Everett Jordan Lake (Jordan Lake). The 2005 NCDWR Cape Fear River Basinwide Water Quality Plan indicates that Jordan Lake is a drinking water supply (WS- IV), a primary area for recreation, and a designated Nutrient Sensitive Water which calls for reduction of non-point source pollution. The water supply watershed boundary for Jordan Lake is just six miles downstream from the Site. The Cape Fear watershed is also discussed in the 2005 North Carolina Wildlife Resource Commission’s Wildlife Action Plan where sedimentation is noted as a major issue in the basin. Maps within the Wildlife Action Plan indicate that Priority Species are present along Cane Creek. Restoration at the Site will directly address non‐point source stressors by removing cattle from the streams, creating stable stream banks, restoring a riparian corridor, and placing approximately 16.7 acres of land under permanent conservation easement. The proposed project will help meet the goals for the watershed and provide numerous ecological benefits within the Cape Fear River Basin. While many of these benefits are limited to the project area, others, such as pollutant removal, reduced sediment loading, and improved aquatic and terrestrial habitat, have farther-reaching effects. In addition, protected parcels downstream of this site promote cumulative project benefits within the watershed. This mitigation plan has been written in conformance with the requirements of the following documents that govern NCDMS operations and procedures for the delivery of compensatory mitigation.  Federal rule for compensatory mitigation project sites as described in the Federal Register Title 33 Navigation and Navigable Waters Volume 3 Chapter 2 Section § 332.8 paragraphs (c)(2) through (c)(14).  DMS In-Lieu Fee Instrument signed and dated July 28, 2010. Maney Farm Mitigation Project Final Mitigation Plan Page iii TABLE OF CONTENTS EXECUTIVE SUMMARY ....................................................................................................................... ii Table of contents .............................................................................................................................. iii 1.0 Restoration Project Goals and Objectives ............................................................................1 2.0 Project Site Location and Selection ......................................................................................2 2.1 Directions to Project Site ........................................................................................................... 2 2.2 Site Selection and Project Components .................................................................................... 3 3.0 Site Protection Instrument ..................................................................................................3 4.0 Baseline Information –Project Site and Watershed Summary ...............................................3 4.1 Watershed Existing Conditions ................................................................................................. 3 4.2 Watershed Historical Land Use and Development Trends ....................................................... 3 4.3 Physiography, Geology, and Soils .............................................................................................. 5 4.4 Valley Classification ................................................................................................................... 6 4.5 Surface Water Classification and Water Quality ....................................................................... 6 4.6 Existing Stream Condition ......................................................................................................... 6 4.7 Channel Evolution ................................................................................................................... 12 4.8 Channel Stability ...................................................................................................................... 13 4.9 Utilities and Site Access ........................................................................................................... 14 5.0 Regulatory Considerations ................................................................................................ 14 5.1 401/404 ................................................................................................................................... 14 5.2 Threatened and Endangered Species ...................................................................................... 19 5.3 Cultural Resources ................................................................................................................... 20 5.4 FEMA Floodplain Compliance and Hydrologic Trespass ......................................................... 21 6.0 Reference Sites ................................................................................................................. 21 6.1 Reference Streams .................................................................................................................. 21 6.2 Channel Morphology and Classification of Reference Streams .............................................. 21 7.0 Determination of Credits ................................................................................................... 25 8.0 Credit Release Schedule .................................................................................................... 26 8.1 Initial Allocation of Released Credits ....................................................................................... 26 8.2 Subsequent Credit Releases .................................................................................................... 27 9.0 Project Site Mitigation Plan ............................................................................................... 27 9.1 Justification for Proposed Intervention ................................................................................... 27 9.2 Stream Restoration and Enhancement Design Overview ....................................................... 27 9.3 Design Discharge Analysis ....................................................................................................... 27 Note: Units for all discharge estimates are cubic feet per second. ........................................................ 29 9.4 Design Channel Morphologic Parameters ............................................................................... 29 9.5 Sediment Transport Analysis ................................................................................................... 32 9.6 Project Implementation .......................................................................................................... 34 10.0 Maintenance Plan ............................................................................................................. 37 11.0 Performance Standards ..................................................................................................... 37 11.1 Streams .................................................................................................................................... 37 12.0 Monitoring Plan ................................................................................................................ 39 12.1 Streams .................................................................................................................................... 39 13.0 Long-Term Management Plan ........................................................................................... 42 14.0 Adaptive Management Plan .............................................................................................. 42 15.0 Financial Assurances ......................................................................................................... 42 16.0 References ........................................................................................................................ 44 Maney Farm Mitigation Project Final Mitigation Plan Page iv TABLES Table 1: Mitigation Goals and Objectives ............................................................................................2 Table 2: Site Protection Instrument ....................................................................................................3 Table 3: Project and Watershed Information.......................................................................................4 Table 4: Project Soil Types and Descriptions........................................................................................5 Table 5: Reach Summary Information .................................................................................................9 Table 6: Stream Existing Conditions .................................................................................................. 10 Table 7: Existing Conditions Channel Stability Assessment Results ..................................................... 14 Table 8: Wetland Summary Information ........................................................................................... 16 Table 9: Listed Threatened and Endangered Species in Chatham County, NC ..................................... 19 Table 10: Summary of Reference Reach Geomorphic Parameters ...................................................... 23 Table 11: Determination of Credits ................................................................................................... 25 Table 12: Credit Release Schedule – Stream Credits .......................................................................... 26 Table 14: Design Morphological Parameters ..................................................................................... 30 Table 15: Sediment Transport Competence Analysis ......................................................................... 33 Table 16: Planting List ...................................................................................................................... 36 Table 17: Maintenance Plan ............................................................................................................. 37 FIGURES Figure 1 Vicinity Map Figure 2 Site Map Figure 3 Watershed Map Figure 4 Soils Map Figure 5 USGS Map Figure 6 Hydrologic Features Map Figure 7 FEMA Flood Map Figure 8 Reference Reach Vicinity Map Figure 9 Concept Design Map Figure 10 NC Piedmont Regional Curves with Project Data Overlay Figure 11 Proposed Monitoring Components Map APPENDICES Appendix 1 Site Photographs Appendix 2 Site Protection Instrument and Plat Appendix 3 Historic Aerial Photographs Appendix 4 NCDWR Stream Classification Forms Appendix 5 Existing Geomorphic Survey Data Appendix 6 HEC-20 Channel Stability Assessment Data Appendix 7 USACE Routine Wetland Determination Data Forms, NCWAM Data Forms, and Jurisdictional Determination Appendix 8 Pre-construction Notification Appendix 9 Categorical Exclusion Appendix 10 Floodplain Development Permit Correspondence Maney Farm Mitigation Project Final Mitigation Plan Page 1 1.0 RESTORATION PROJECT GOALS AND OBJECTIVES The Maney Farm Mitigation Site (referred to herein as Site or Project) is located in the Cane Creek Watershed which has been designated a Nutrient Sensitive Water (NSW). The project streams flow into South Fork Cane Creek which flows into Cane Creek. Cane Creek flows to the Haw River and eventually into the B. Everett Jordan Lake (Jordan Lake). The Site’s watershed is within 14-Digit Hydrologic Unit Code (HUC) 03030002050050 which was identified as a Cape Fear 02 Targeted Local Watershed (TLW) in the NC Division of Mitigation Services’ (DMS) 2009 Cape Fear River Basin Restoration Priority (RBRP) plan. The parcel immediately downstream of the Site is currently under both a Farmland Preservation Trust Fund Easement and a Piedmont Land Conservancy Easement. The restored stream reach and riparian corridor will further extend the protected wildlife habitat within these two parcels. DMS also maintains easements on adjacent parcels (i.e., the Hadley Newlin site) promoting cumulative project benefits within the watershed. The proposed Site is located within the Cane Creek TLW and is discussed in DMS’s 2009 Cape Fear RBRP plan. This document identifies the need to improve aquatic conditions and habitats as well as promoting good riparian conditions in the Cane Creek watershed and notes that there are currently 51 active animal operations in the watershed. The Site is currently maintained as cattle pasture and is one of the 51 animal operations referenced in the RBRP plan. The 2005 NC Division of Water Resources (NCDWR) Cape Fear River Basinwide Water Quality Plan indicates that Jordan Lake is a drinking water supply, a primary area for recreation, and a designated NSW which calls for reduction of non-point source pollution. The water supply watershed boundary for Jordan Lake is just six miles downstream from the Site. The Cape Fear watershed is also discussed in the 2005 North Carolina Wildlife Resource Commission’s Wildlife Action Plan where sedimentation is noted as a major issue in the basin. Maps within the Wildlife Action Plan indicate that Priority Species are present along Cane Creek. Restoration at the Site will directly address non‐point source stressors by removing cattle from the streams, creating stable stream banks, restoring a riparian corridor, and placing approximately 16.7 acres of land under permanent conservation easement. The Project will help meet the functional goals described in the Cape Fear RBRP plan through stream restoration and enhancement activities and riparian buffer re-establishment. Project goals are desired project outcomes and are verifiable through visual assessment and/or measurement. Objectives are activities that will result in the accomplishment of goals. The project will be monitored after construction to demonstrate success as described in Section 12. The project goals and related objectives are described in Table 1. Maney Farm Mitigation Project Final Mitigation Plan Page 2 Table 1: Mitigation Goals and Objectives Maney Farm Mitigation Project Goal Objective Expected Outcomes Exclude cattle from project streams Install fencing around conservation easements adjacent to cattle pastures Reduce pollutant inputs including fecal coliform, nitrogen, and phosphorous. Stabilize eroding stream banks Reconstruct stream channels with stable dimensions. Add bank revetments and in-stream structures to protect restored/enhanced streams. Reduce inputs of sediment into streams. Construct stream channels with that are laterally and vertical stable Construct stream channels that will maintain a stable pattern and profile considering the hydrologic and sediment inputs to the system, the landscape setting, and the watershed conditions. Return a network of streams to a stable form that is capable of supporting hydrologic, biologic, and water quality functions. Improve instream habitat Install habitat features such as constructed riffles and brush toes into restored/enhanced streams. Add woody materials to channel beds. Construct pools of varying depth. Improve aquatic communities in project streams. Reconnect channels with floodplains so that floodplains are inundated relatively frequently Reconstructing stream channels with appropriate bankfull dimensions and depth relative to the existing floodplain. Raise local groundwater elevations. Inundate floodplain wetlands and vernal pools. Reduce shear stress on channels during larger flow events. Restore and enhance native floodplain forest Plant native tree and understory species in riparian zone Create and improve forested riparian habitats. Provide a canopy to shade streams and reduce thermal loadings. Create a source of woody inputs for streams. Reduce flood flow velocities on floodplain and allow pollutants and sediment to settle. Permanently protect the project site from harmful uses. Establish a conservation easement on the site. Ensure that development and agricultural uses that would damage the site or reduce the benefits of project are prevented. 2.0 PROJECT SITE LOCATION AND SELECTION 2.1 Directions to Project Site The Site is located in northwestern Chatham County (35.838333, -79.343889), northwest of Pittsboro and north of Silk Hope (Figure 1). From Raleigh, NC, take I-40 West towards Durham. Take exit 293A for US-1 / US-64 / West toward Sanford/Asheboro. Travel approximately three miles and take exit 98B for US-64 West. Travel approximately 25 miles, take exit 381 for NC-87 towards Burlington. Travel approximately 1.8 miles Maney Farm Mitigation Project Final Mitigation Plan Page 3 on NC-87 North and turn left onto Silk Hope Gum Springs Road. Continue for 8.1 miles to Silk Hope Lindley Mill Road. Take Silk Hope-Lindley Mill Road north 3.6 miles. Turn right on Center Church Road and travel 0.9 miles. The Site is located north of Center Church Road. 2.2 Site Selection and Project Components The Site has been selected by the DMS to provide stream mitigation units (SMUs) in the Cape Fear River Basin. It was selected based on the current degraded condition of the on-site streams and the potential for functional restoration and ecological uplift. The project includes a combination of stream restoration and enhancement. The streams proposed for restoration and enhancement are all unnamed tributaries (UT) to South Fork Cane Creek and are referred to herein as UTSF, UT1, UT2, UT3, UT4, and UT5 (Figure 2). Jurisdictional wetlands are present in the surrounding floodplain that will be enhanced as part of the project but are not proposed for credit at this time. Photographs of the Site are included in Appendix 1. 3.0 SITE PROTECTION INSTRUMENT The land required for construction, management, and stewardship of this mitigation project includes portions of the parcel listed in Table 2. A conservation easement will be recorded on the parcel to include the streams being restored and enhanced along with their corresponding riparian buffers. A copy of the site protection instrument and recorded plat are included in Appendix 2. Table 2: Site Protection Instrument Maney Farm Mitigation Project Landowner PIN County Site Protection Instrument Deed Book and Page Number Acreage to be Protected M Darryl Lindley Rev Trustee 8795-99-2158 Chatham Conservation Easement TBD 16.694 All site protection instruments require 60-day advance notification to the Corps and the State prior to any action to void, amend, or modify the document. No such action shall take place unless approved by the State. 4.0 BASELINE INFORMATION –PROJECT SITE AND WATERSHED SUMMARY 4.1 Watershed Existing Conditions Table 3 presents the project information and baseline watershed information. The watershed areas were delineated using a combination of-site existing conditions survey, Chatham County, NC GIS data and USGS 7.5-minute topographic quadrangles (Figure 3). 4.2 Watershed Historical Land Use and Development Trends The UTSF watershed (Figure 3) is located in the rural countryside approximately four miles north of Silk Hope, NC. Topography can be described as somewhat hilly to gently rolling. The stream valleys within the watershed and on-site are characterized by relatively narrow floodplains and moderately steep side slopes. A review of historical aerials of the Site and immediately adjacent parcels from 1973, 1983, and 1993 (Appendix 3) revealed that the Site has been used for hay production and/or agricultural livestock production since before 1973. The limits of riparian buffer and agricultural land have Maney Farm Mitigation Project Final Mitigation Plan Page 4 remained consistent over that time. Further investigation was done on landuse throughout the entire watershed using the aerial photographs listed above and additional aerials from Google Earth™ (1972-2014). The most common historical and current land use types are agricultural livestock production and grazing, silviculture, and agricultural cropland. Table 3: Project and Watershed Information Maney Farm Mitigation Project Project County Chatham Easement Area (acres) 16.4 Project Coordinates 35°50'18.00"N, 79°20'38.00"W (35.838333, -79.343889) Physiographic Region Carolina Slate Belt of the Piedmont Physiographic Province Ecoregion Piedmont River Basin Cape Fear USGS HUC (8 digit, 14 digit) 03030002, 03030002050050 NCDWR Sub- basin 03-06-04 Reaches UTSF-R1 UTSF-R2 UT1A UT1B UT1C UT2A/B UT3A/B UT4A/B UT5 Drainage (Area (acres) 115 211 16 4 19 11 10 20 76 Drainage Area (miles2) 0.18 0.33 0.02 0.01 0.03 0.02 0.02 0.03 0.12 NCCGIA Land Cover Classification (%) Hay / Pasture 72 67 74 56 57 67 95 53 64 Deciduous Forest 25 23 26 0 29 33 1 35 28 Mixed Forest 0 3 0 0 0 0 4 7 2 Developed 0 3 0 44 13 0 0 0 0 Cultivated Crops 3 2 0 0 0 0 0 0 4 Scrub / Shrub 0 1 0 0 0 0 0 0 2 Herbaceous 0 1 0 0 1 0 0 5 0 Wildlands conducted a watershed reconnaissance visit to verify current land uses observed in aerial photography and to identify potential watershed stressors that could impact streams on-site. Land use in the UTSF watershed was found to be consistent with information depicted in aerial photography. Disturbed areas within the watershed consist primarily of agricultural landuses. As this is a long-term, on-going practice (dating to before 1973) it is not considered a new stressor to the watershed. There are no evident signs of impending land use changes or development pressure that would impact the project in the UTSF watershed. The drainage upstream of the project site consists of a network in small ditches which have been maintained in the current locations and alignments since at least 1973. Sediment supply from the upstream watershed is small and likely to remain stable. The Conservation Easement to be placed around the Site will eliminate potential for future development or agricultural use in the immediate vicinity of the on-site streams. Maney Farm Mitigation Project Final Mitigation Plan Page 5 4.3 Physiography, Geology, and Soils The project is located in the Slate Belt of the Piedmont Physiographic Province. The Piedmont Province is characterized by gently rolling, well rounded hills with long low ridges, with elevations ranging from 300 – 1,500 feet above sea level. The Carolina Slate Belt consists of heated and deformed volcanic and sedimentary rocks. Specifically, the proposed project is located in felsic metavolcanic rock (mapped CZfv) of the Carolina Slate Belt, which corresponds to the Uwharrie Formation’s felsic voncaniclastic rocks and portions of the Cid Formation’s rhyolitic-rhyodactic units. This unit consists of light gray to greenish gray, felsic metavolcanic rock interbedded with mafic and intermediate metavolcanic rock and is composed primarily of feldspar, quartz, sericite, chlorite meta-argillite, and metamudstone (NCGS, 1985). Note: This information was obtained from geologic mapping no field investigations of rock lithology were performed. Due to the lack of bed control (e.g., bedrock, etc.), fluvial erosion, and cattle trampling, the stream has downcut along portions of the reach. The remainder of the Site has relatively confined valleys, which constrict the floodplain, and limited alluvial deposits. Soils in these areas are typical of the gently to moderately sloping upland areas of the Piedmont. Soil mapping units are based on the U.S. Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Soil Survey for Chatham County. Soil types within the study area were mapped with the NRCS Web Soil Survey and are described below in Table 4. A soils map based on this information is provided in Figure 4. Note: no field mapping of soils was performed for this project. Table 4: Project Soil Types and Descriptions Maney Farm Mitigation Project Soil Name Location Description Cid Silt Loam (6-10%) UT2 Cid silt loam is a strongly sloping, moderately deep and moderately well drained soil found on upland and interfluves. The soil forms in residuum from Carolina Slate Belt rock and other fine grained rocks. Cid-Lignum Complex (2-6%) UTSF, UT1, UT 1B, and UT5 Cid-Lignum is found on gently sloping areas of the upland. It is moderately well drained to somewhat poorly drained. These soils have a loamy surface layer and clayey subsoil. Nanford-Badin Complex (2-6%) UT4 Nanford-Badin complex is a well drained soil with low flood potential. It is found on upland, hill slopes, and ridges and consists of residuum weathered from slate. Bedrock is within 40 to 60 inches of this soil. Nanford-Badin Complex (6-10%) UTSF, UT1, UT2 UT3 and UT4 Nanford-Badin complex at 6-10% slopes is found on strong slopes on the side slopes of uplands. This soil is deep and well drained. Bedrock is within 20 to 40 inches of this soil. Source: Chatham County Soil Survey, USDA-NRCS, http://efotg.nrcs.usda.gov Maney Farm Mitigation Project Final Mitigation Plan Page 6 4.4 Valley Classification The topography of the Site and surrounding area consist of gently rolling hills interspersed with narrow valleys (Figure 5). The stream valleys have slopes ranging from 0.2-1.6% and valley side slopes ranging from 5%-10%. UTSF has a narrow alluvial valley that expands and constricts between widths of 150 and 250 feet. UT1, UT2, UT3, and UT4 transition from a constricted valley (<100 feet) within the headwaters to a wider valley (>150 feet) as they approach the confluence with UTSF. UT5 valley widths range between 150 and 200 feet. 4.5 Surface Water Classification and Water Quality On May 28 and 29, 2014 Wildlands investigated on-site jurisdictional waters of the U.S. using the U.S. Army Corps of Engineers (USACE) Routine On-Site Determination Method. This method is defined in the 1987 Corps of Engineers Wetlands Delineation Manual and subsequent Eastern Mountain and Piedmont Regional Supplement. Determination methods include stream classification utilizing the NCDWR Stream Identification Form and the USACE Stream Quality Assessment Worksheet. Potential jurisdictional wetland areas were classified using the USACE Wetland Determination Data Form (refer to Section 5.1 below for more information on jurisdictional wetlands). The results of the on-site field investigation indicate that there are seven jurisdictional stream channels located within the proposed project area that are all UTs to South Fork Cane Creek. Figure 6 illustrates the hydrologic features of the Site. Stream classification forms representative of on-site jurisdictional channels have been enclosed in Appendix 4 (SCP1-SCP10). Site photographs are included in Appendix 1. There is currently no best usage classification assigned by the NCDWR for streams on this Site. 4.6 Existing Stream Condition An existing conditions assessment was performed in May and June, 2014. The purpose of the assessment was to characterize the existing morphology of the Site; identify incision, bank erosion, lack of native vegetation, sedimentation, and poor habitat conditions; and to provide a basis for developing a design to enhance the ecological function of the Site. The locations of the project reaches and surveyed cross-sections are shown in Figure 6. Existing conditions geomorphic survey data are included in Appendix 5. The reach summary information for each stream is summarized in Table 5 and the existing geomorphic conditions are summarized in Table 6. 4.6.1 Unnamed Tributary to South Fork Cane Creek UTSF is divided into two sections for existing conditions analysis. The channel slope and valley slope for UTSF are typical for Piedmont streams in similar valley types (Table 6). The bed of UTSF is predominately characterized by runs, with a few log/debris jams creating isolated pools. Livestock have direct access to the stream, which has resulted in heavily trampled banks and an actively eroding channel. The active scour zones and wallow areas are contributing to the fining of bed material as evidenced by the reach-wide sediment characterization. Pebble-counts and sieve analysis of sediment samples were utilized to characterize sediment within the existing channel and to identify the predominant substrate as silt and sand. The channel classifies as a Rosgen E5. Results of the existing conditions morphologic survey of UTSF Reach 1 and 2 are summarized in Table 6 and the survey data is included in Appendix 5. Vegetative buffers along the reach range from areas of mature trees to open pasture. The forested buffer from the upstream extent to the confluence with UT2 averages 75 feet on each bank. Maney Farm Mitigation Project Final Mitigation Plan Page 7 However, cattle have extensively grazed and trampled the understory resulting in limited vegetative regeneration and ground cover within this reach. The forested buffer from the confluence with UT2 to the downstream extent is intermittent and disconnected. Canopy species include American elm (Ulmus americana), sweetgum (Liquidambar styraciflua), green ash (Fraxinus pennsylvanica), red maple (Acer rubrum), willow oak (Quercus phellos), and southern red oak (Quercus falcata). Understory and herbaceous species were limited but include eastern red cedar (Juniperus virginiana), coralberry (Symphoricarpos orbiculatus), Chinese privet (Ligustrum sinense), soft rush (Juncus effusus), Japanese honeysuckle (Lonicera japonica), and Nepalese browntop (Microstegium vimineum). 4.6.2 Unnamed Tributary 1 The UT1 drainage area is an intermittent system that is divided into three reaches for existing conditions analysis. The majority of the drainage area to UT1 is primarily used for livestock grazing. Livestock have direct access to the stream reaches, which has resulted in heavily trampled banks and an actively eroding channel. The active scour zones and wallow areas are contributing to the fining of bed material. Channel incision ranges from slight to moderate throughout the reaches. The UT1 reaches classify as Rosgen B5 channel types. Results of the existing conditions morphologic survey of UT1 are summarized in Table 6 and the survey data is included in Appendix 5. Riparian vegetation along the UT1A reach is predominately managed herbaceous species comprised of fescue (Fetsuca sp.), blackberry (Rubus sp.), coralberry, white clover (Trifolium repens), buttercup species (Ranunculus spp.), and multiflora rose (Rosa multiflora). UT1B contains mature trees within the riparian zone, but several mature trees were noted as stressed or dying presumably as a result of root compaction from cattle trampling. The UT1C reach contains a narrow corridor of mature trees with little to no middle and understory due to cattle grazing. Tree species within the UT1 reaches include American elm, green ash, red maple, white oak (Quercus alba), sweetgum, and willow oak. 4.6.3 Unnamed Tributary 2 UT2 begins as an intermittent stream and develops into a perennial system prior to its confluence with UTSF. While UT2 has an intact mature riparian corridor, cattle have open access to the entire reach and have heavily impacted the understory and herbaceous layers. While the majority of the upper reach is impacted by cattle, the reach is relatively stable. The lower reach prior to the confluence with UTSF has been heavily trampled by cattle. The UT2 reach classifies as Rosgen B5 channel types. Results of the existing conditions morphologic survey of UT2 are summarized in Table 6 and the survey data is included in Appendix 5. The vegetative buffers along the reach are approximately 200 feet on each bank and are predominately comprised of mature trees. Canopy species along UT2 include American elm, green ash, red maple, eastern red cedar, willow oak, white oak, hickory sp. (Carya sp.), and tulip poplar (Liriodendron tulipifera). Understory and herbaceous species were limited but include coralberry, Chinese privet, Japanese honeysuckle, and Nepalese browntop. 4.6.4 Unnamed Tributary 3 UT3 is an intermittent system within an active cattle pasture. While the entire reach is impacted by cattle, the majority of the stream reach is relatively stable. The stream channel is no longer discernable along the lower reach due to cattle trampling. The UT3 reach classifies as Rosgen E5b channel type. Results of the existing conditions morphologic survey of UT3 are summarized in Table 6 and the survey data is included in Appendix 5. Maney Farm Mitigation Project Final Mitigation Plan Page 8 Riparian vegetation along the reach is predominately comprised of managed herbaceous layers including fescue, white clover, Nepalese browntop, horseweed, and buttercup species. Scattered canopy trees are present primarily within the upper extent of the reach and include red maple, sugarberry (Celtis laevigata), willow oak, and tulip poplar. An isolated stand of green ash and sugarberry with an understory of Chinese privet is located near the confluence with UTSF. Maney Farm Mitigation Project Final Mitigation Plan Page 9 Table 5: Reach Summary Information Maney Farm Mitigation Project UTSF R1 UTSF R2 UT1A UT1B UT1C UT2A UT2B UT3A UT3B UT4A UT4B UT5 Existing Length (LF) 2,298 1,209 390 102 166 485 44 418 84 217 40 778 Valley Slope (feet/ foot) 0.0131 0.0086 0.0187 0.0396 0.0187 0.0366 0.0366 0.0377 0.0377 0.0232 0.0232 0.0139 Drainage Area (acres) 115 211 16 4 19 11 11 10 10 20 20 76 Drainage Area (miles2) 0.18 0.33 0.02 0.01 0.03 0.02 0.02 0.02 0.02 0.03 0.03 0.12 NCDWR Stream ID Score 27/37 37 21 25.5 28 26/30 30 20.75 20.75 22.5 22.5 32.5 Perennial (P) or Intermittent (I) I/P P I I I I/P P I I I I P NCDWR Classification N/A Rosgen Classification of Existing Conditions E5 E5 B5 - B5 B5 B5 E5b E5b E5b E5b E5 Simon Evolutionary Stage II/IV II/IV III V II/IV II/V II/V V/VI V/VI II/V II/V II/III FEMA Zone Classification X Note: The Rosgen classification system is for natural streams. These channels have been heavily manipulated and impacted by livestock trampling and therefore the Rosgen classification system is used to describe an approximate description of stream type only. Maney Farm Mitigation Project Final Mitigation Plan Page 10 Table 6: Stream Existing Conditions Maney Farm Mitigation Project Parameter Notation Units UTSF-R1 UTSF-R2 UT1A UT1B UT1C UT2A UT2B UT3A UT3B UT4A UT4B UT5 min max min max min max min max min max min max min max min max min max min max min max min max stream type E5 E5 B5 - B5 B5 B5 E5b E5b E5b E5b E5 drainage area DA sq mi 0.18 0.33 0.02 0.01 0.03 0.02 0.02 0.02 0.02 0.03 0.03 0.12 bankfull cross-sectional area Abkf SF 4.1 7.1 5.4 5.6 2.1 - 2.1 1.1 1.1 1.1 1.1 1.9 1.9 3.5 avg velocity during bankfull event vbkf fps 2.8 4.8 3.4 3.6 3.1 - 3.0 3.4 3.4 3.2 3.2 3.0 3.0 2.1 width at bankfull wbkf feet 3.2 12.0 4.7 8.2 5.8 - 4.1 2.6 2.6 2.2 2.2 4.4 4.4 5.7 maximum depth at bankfull dmax feet 1.2 2.0 1.5 0.6 - 0.8 0.5 0.5 0.8 0.8 1.0 1.0 1.2 mean depth at bankfull dbkf feet 0.6 1.3 0.7 1.2 0.4 - 0.5 0.4 0.4 0.5 0.5 0.4 0.4 0.6 bankfull width to depth ratio wbkf/dbkf 2.5 20.4 4.0 12.3 15.9 - 8.1 6.2 6.2 4.6 4.6 9.9 9.9 9.1 low bank height feet 2.6 2.7 2.1 2.9 1.5 - 1.8 2.9 2.9 1.7 1.7 1.4 1.4 1.6 bank height ratio BHR 1.3 2.2 1.4 1.9 2.3 - 2.3 5.4 5.4 2.2 2.2 1.4 1.4 1.4 max pool depth at bankfull dpool feet 1.5 1.8 1.8 2.0 - - - - - - - - - 1.4 pool depth ratio dpool/dbkf 1.4 2.5 1.7 2.6 - - - - - - - - - 2.3 pool width at bankfull wpool feet 5.6 7.2 7.0 7.5 - - - - - - - - - 3.7 pool width ratio wpool/wbkf 0.6 1.8 0.9 1.5 - - - - - - - - 0.7 Bkf pool cross-sectional area Apool SF 6.6 7.2 8.5 11.1 - - - - - - - - - 3.4 pool area ratio Apool/Abkf 1.0 1.6 1.6 2.0 - - - - - - - - 1.0 floodprone area width wfpa feet 15.2 50.0 69.8 82.0 10.6 - 5.3 4.4 4.4 11.4 11.4 23.3 23.3 40.0 entrenchment ratio ER 1.4 12.5 10.0 14.8 1.8 - 1.3 1.7 1.7 5.1 5.1 5.3 5.3 7.1 valley slope Svalley feet/ foot 0.0131 0.0086 0.0187 0.0396 0.0187 0.0366 0.0366 0.0377 0.0377 0.0232 0.0232 0.0139 channel slope Schannel feet/ foot 0.0090 0.0057 0.01282 0.0323 0.0186 0.0195 0.0157 0.0383 0.0291 0.0259 0.0651 0.0112 sinuosity K 1.34 1.33 1.10 1.16 1.17 1.12 1.04 1.09 1.00 1.14 1.06 1.34 belt width wblt feet 5 42 10 37 8 22 6 9 10 18 4 26 1 2 26 27 - - 4 13 2 3 3 18 meander width ratio wblt/wbkf 1.6 3.5 2.1 4.5 1.4 3.8 - 2.4 4.4 1.5 10.0 0.4 0.8 11.8 12.3 - - 0.9 3.0 0.5 0.7 0.5 3.2 Maney Farm Mitigation Project Final Mitigation Plan Page 11 Parameter Notation Units UTSF-R1 UTSF-R2 UT1A UT1B UT1C UT2A UT2B UT3A UT3B UT4A UT4B UT5 min max min max min max min max min max min max min max min max min max min max min max min max meander length Lm feet 18 100 21 59 47 155 28 36 54 63 5 15 12 131 131 - - 29 44 11 22 16 58 meander length ratio Lm/wbkf 5.6 8.3 4.5 7.2 8.1 26.7 - 13.2 15.4 1.9 5.8 4.6 60.0 72.7 - - 6.6 10.0 2.5 5.0 2.8 10.2 radius of curvature Rc feet 4 25 5 13 6 20 7 9 9 16 3 16 1 3 25 25 - - 3 11 2 3 3 14 radius of curvature ratio Rc/wbkf 1.3 2.1 1.1 1.6 1.0 3.5 - 2.2 3.9 1.2 6.2 0.4 1.2 11.4 15.0 - - 0.7 2.5 0.5 0.7 0.5 2.5 Particle Size Distribution from Reachwide Pebble Count / Sieve Analysis d50 Description Medium Sand Silt/Clay N/A N/A N/A N/A N/A N/A N/A N/A N/A Silt/Clay d16 mm Silt/Clay Silt/Clay N/A N/A N/A N/A N/A N/A N/A N/A N/A Silt/Clay d35 mm Very Fine Sand Silt/Clay N/A N/A N/A N/A N/A N/A N/A N/A N/A Silt/Clay d50 mm Medium Sand Silt/Clay N/A N/A N/A N/A N/A N/A N/A N/A N/A Silt/Clay d84 mm 11.08 6.1 N/A N/A N/A N/A N/A N/A N/A N/A N/A 8.9 d95 mm 15.41 28.5 N/A N/A N/A N/A N/A N/A N/A N/A N/A 22.6 d100 mm 22.6 180 N/A N/A N/A N/A N/A N/A N/A N/A N/A 64 Maney Farm Mitigation Project Final Mitigation Plan Page 12 4.6.5 Unnamed Tributary 4 Livestock have direct access to UT4 which has resulted in trampled bed and banks throughout the reach. The lower reach near the confluence of UTSF has areas of active headcuts and unstable banks. Vegetative buffers along the reach range from areas with narrow strips of mature trees to open pasture. The UT4 reach classifies as Rosgen E5b channel type. Results of the existing conditions morphologic survey of UT4 are summarized in Table 6 and the survey data is included in Appendix 5. Canopy species along this reach include white oak, sweetgum, eastern red cedar, and green ash. Understory species include American holly (Ilex opaca), eastern red cedar, and American elm. The shrub and herbaceous layer primarily included Chinese privet, coralberry, Nepalese browntop, fescue, white clover, and buttercup. 4.6.6 Unnamed Tributary 5 UT5 begins in a heavily forested area in which cattle have been excluded. The impacted reach in which cattle have access ranges from areas of mature over-story in the upper extent to managed herbaceous layers near the confluence with UTSF. Deposition of fine material is apparent along the impacted portion of this stream. Results of the existing conditions morphologic survey of UT4 are summarized in Table 6 and the survey data is included in Appendix 5. Canopy species include American elm, green ash, red maple, willow oak, southern red oak. Understory and herbaceous species were limited but include black willow (Salix nigra), eastern red cedar, coralberry, Chinese privet, and Nepalese browntop. Existing condition surveys showed areas of incision along with trampled bed and banks. The incision and cattle trampling have resulted in a fining of bed material with a median particle size of silt/clay. The UT5 reach classifies as Rosgen E5 channel type. Results of the existing conditions morphologic survey of UT4 are summarized in Table 6 and the survey data is included in Appendix 5. 4.7 Channel Evolution The presence of livestock and agricultural land use practices have prevented the channels from evolving from disturbed to stable conditions. For this reason, the historic condition of the channels is discussed below but a detailed discussion of channel evolution is not warranted. According to the historical aerial photographs, the land use on-site has been hay or livestock production since 1972. The riparian buffer widths were reduced prior to the early 1970s to maximize the area available for agricultural practices. The extent of riparian buffers on site and within the contributing watershed have remained essentially unchanged since. These historic landscape disturbances likely resulted in higher discharge and sediment loads to project streams which would have perturbed the system and resulted in morphologic changes. However, the land cover alterations likely ceased quickly in which case the channels would have re-stabilized. However, on-going livestock access has resulted in continual trampling of the stream beds and banks and this, along with a lack of riparian vegetation along much of the project stream length, has prevented the channels from progressing to stables forms. The propagation of headcuts through the project reaches have been arrested by large roots and debris jams which are the primary sources of grade control. However, incision that resulted from headcuts remains along some reaches and contributes to the instability of the system. Bank failures through mass wasting were observed along portions of the project. The channels will not progress Maney Farm Mitigation Project Final Mitigation Plan Page 13 to a stable, equilibrium state until livestock are removed from the streams, stable channel dimensions are established, and incision is corrected. 4.8 Channel Stability Wildlands utilized a modified version of the Rapid Assessment of Channel Stability as described in Hydrologic Engineering circular (HEC)-20 (Lagasse et al., 2001). The method is semi-qualitative and incorporates 13 stability indicators that are evaluated in the field. In a 2006 publication, the Federal Highway Administration (FHWA) updated the method for HEC-20 by modifying the metrics included in the assessment and incorporating a stream type determination. The result is an assessment method that can be rapidly applied on a variety of stream types in different physiographic settings with a range of bed and bank materials. The Channel Stability Assessment protocol was designed to evaluate 13 parameters. Once all parameters are scored, the stability of the stream is classified as Excellent, Good, Fair, or Poor. As the protocol was designed to assess stream channel stability near bridges, two minor modifications were made to the methodology to make it more applicable to project specific conditions. The first modification involved adjusting scoring so that naturally meandering streams score lower (better condition) than straight and/or engineered channels. Because straight, engineered channels are hydraulically efficient and necessary for bridge protection, they score low (excellent to good rating) with the original methodology. Secondly, the last assessment parameter – upstream distance to bridge – was removed from the protocol because it relates directly to the potential effects of instability on a bridge and should not influence stability ratings for the streams for this project. The final scores and corresponding ratings were based on the 12 remaining parameters. The rating adjectives were assigned to the streams based on the FHWA guidelines for pool-riffle stream types. The HEC-20 manual also describes both lateral and vertical components of overall channel stability, which can be separated with this assessment methodology. Some of the parameters described above relate specifically to either vertical or horizontal stability. When all parameter scores for the vertical category or all parameter scores for the horizontal category are summed and normalized by the total possible scores for their respective categories, a vertical or horizontal fraction is produced. These fractions may then be compared to one another to determine if the channel is more vertically or horizontally unstable. The assessment results for the streams on the Site are shown in Table 7 and the forms are included in Appendix 6. Reaches UT1A, UT1C, UT2A/B, UT3A/B, and UT4A/B were all rated good whereas UTSF R1, UTSF R2, UT1B, and UT5 were all rated as fair. The vertical and lateral fractions for UT1A, UT1C, UT2A/B, UT3A/B, and UT4A/B are similar indicating that the streams are no more laterally unstable than vertically unstable. These reaches are considered fairly stable for most of their length and enhancement activities are the proposed mitigation approach, though redesign of the downstream ends of each channel is required in order to connect these streams to the restored UTSF reach. For UTSF, UT1B, and UT5 the lateral fraction is larger than the vertical fraction indicating that, although some incision may have occurred, the streams are more laterally unstable than vertically unstable. The lateral instability is related to a combination of factors including livestock trampling, mass wasting, and fluvial erosion. Due to the fairly significant lateral instability of these reaches, a restoration approach is proposed. While UT1B falls within this category of significant lateral instability (almost completely related to livestock trampling), restoration is not proposed for this very small drainage. Maney Farm Mitigation Project Final Mitigation Plan Page 14 Table 7: Existing Conditions Channel Stability Assessment Results Maney Farm Mitigation Project Parameter UTSF R1 UTSF R2 UT1 A & C UT1B UT2 A & B UT3 A & B UT4 A & B UT5 1. Watershed characteristics 10 10 11 11 6 6 6 4 2. Flow habit 1 1 7 7 3 3 3 1 3. Channel pattern 8 8 5 7 3 4 4 9 4. Entrenchment 4 4 3 2 7 3 3 6 5. Bed material 8 8 9 10 7 10 7 9 6. Bar development 1 1 3 3 3 3 3 10 7. Obstructions 8 8 4 4 4 2 3 4 8. Bank soil texture and coherence 3 3 4 4 4 3 3 5 9. Average bank slope angle 10 10 6 6 7 7 7 11 10. Bank protection 10 10 7 9 6 4 7 11 11. Bank cutting 11 9 6 9 4 4 4 8 12. Mass wasting or bank failure 9 9 6 9 4 7 4 9 Score 83 81 71 81 58 56 54 87 Ranking Fair Fair Good Fair Good Good Good Fair Lateral Score 43 41 29 37 25 25 25 44 Vertical Score 13 13 15 15 17 16 13 25 Lateral Fraction 72% 68% 48% 62% 42% 42% 42% 73% Vertical Fraction 36% 36% 42% 42% 47% 44% 36% 69% 4.9 Utilities and Site Access There are no underground or overhead utilities on the Site. There is an existing culvert under a state maintained road at the upstream end of UTSF and UT1B (Center Church Road). The project will not affect these culverts and they will remain in place in their current configuration. There is one 25 foot wide proposed easement break that will include a culverted crossing. The crossings will be fenced both upstream and downstream to permanently prevent livestock access and provide better protection of the riparian area. This crossing area is not included in the mitigation credit calculation for the Site. The Site is accessible from a farm road and pasture access gates off of Center Church Road. 5.0 REGULATORY CONSIDERATIONS 5.1 401/404 On May 28 and 29, 2014 Wildlands investigated on-site jurisdictional Waters of the U.S. within the proposed project easement area. Jurisdictional areas were delineated using the USACE Routine On- Site Determination Method. This method is defined by the 1987 Corps of Engineers Wetlands Delineation Manual and subsequent Eastern Mountain and Piedmont Regional Supplement. Maney Farm Mitigation Project Final Mitigation Plan Page 15 Wetland determination Data Forms representative of on-site jurisdictional areas as well as non- jurisdictional upland areas have been included in Appendix 7. All jurisdictional waters of the U.S. were surveyed by Turner Land Surveying, PLLC. The results of the on-site field investigation indicate that there are seven jurisdictional stream channels located within the proposed project area that are all unnamed tributaries to South Fork Cane Creek (UTSF, UT1{Reach A and C}, UT1B, UT2{Reach A and B}, UT3{Reach A and B}, UT4{Reach A and B}, and UT5). UTSF downstream of the confluence with UT1, the lower half of UT2, and UT5 are classified as perennial channels. UT1, UT1B, the upper extent of UT2, UT3, and UT4 are classified as an intermittent stream channels. Twenty one jurisdictional wetland areas, ranging from 0.003 to 0.203 acres, were identified within or immediately adjacent to the proposed project area (Wetland A-U) and are located within the floodplains of the unnamed tributaries. These 21 areas are considered wetland inclusions in non- wetland soils. Wetlands A, B, D, F, L, and N – U were classified as bottomland hardwood forest using the North Carolina Wetland Assessment Method (NCWAM) classification key and the evaluator’s best professional judgment. Wetlands C, E, G-K, and M were classified as seeps. On-site wetland features exhibited saturation within the upper 12 inches of the soil profiles, low chroma soils, drainage patterns, and/or pockets of shallow inundation. Common hydrophytic vegetation included American elm, green ash, shallow sedge, and soft rush. Characteristics of wetlands A-U are described in Table 8. The design of the Site is focused on minimizing impacts to the wetlands and protecting wetland areas with a conservation easement. All wetland areas inside the limits of disturbance will be flagged with safety fence during construction to prevent unintended impacts. This will be denoted in the final construction plans Erosion and Sediment Control sheets, details and specifications. Potential impacts to existing wetlands are detailed in the Pre-Construction Notification enclosed in Appendix 8 and illustrated on the final Construction Plans. Maney Farm Mitigation Project Final Mitigation Plan Page 16 Table 8: Wetland Summary Information Maney Farm Mitigation Project A B C D E F G Size of Wetland (acres) 0.006 0.010 0.034 0.005 0.051 0.003 0.008 Wetland Type Bottomland Hardwood Forest Bottomland Hardwood Forest Seep Bottomland Hardwood Forest Seep Bottomland Hardwood Forest Seep Mapped Soil Series Cid-Lignum Cid-Lignum Cid-Lignum / Naford-Badin Cid-Lignum Cid-Lignum / Naford-Badin Cid-Lignum Cid-Lignum Drainage Class Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Well to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Well to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Soil Hydric Series Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Source of Hydrology Groundwater / Overbank Flooding Groundwater / Overbank Flooding Groundwater Seep Groundwater / Overbank Flooding Groundwater Seep Groundwater / Overbank Flooding Groundwater Seep Hydrologic Impairment N/A N/A N/A N/A N/A N/A N/A Native Vegetation Community Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest % Composition Invasive Species 0% 5% 5% 10% 0% 10% 10% Maney Farm Mitigation Project Final Mitigation Plan Page 17 Table 8: Wetland Summary Information Maney Farm Mitigation Project H I J K L M N Size of Wetland (acres) 0.012 0.007 0.008 0.203 0.015 0.023 0.029 Wetland Type Seep Seep Seep Seep Bottomland Hardwood Forest Seep Bottomland Hardwood Forest Mapped Soil Series Cid-Lignum Naford-Badin Naford-Badin Naford-Badin Cid-Lignum / Cid Silt Loam Cid-Lignum Cid-Lignum Drainage Class Moderately to Somewhat Poorly Drained Well Drained Well Drained Well Drained Moderately Well to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Soil Hydric Series Wehadkee, Undrained N/A N/A N/A Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Source of Hydrology Groundwater Seep Groundwater Seep Groundwater Seep Groundwater Seep Groundwater / Overbank Flooding Groundwater Seep Groundwater / Overbank Flooding Hydrologic Impairment N/A N/A N/A N/A N/A N/A N/A Native Vegetation Community Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest % Composition Invasive Species 5% 5% 5% 1% 10% 5% 10% Maney Farm Mitigation Project Final Mitigation Plan Page 18 Table 8: Wetland Summary Information Maney Farm Mitigation Project O P Q R S T U Size of Wetland (acres) 0.011 0.014 0.176 0.019 0.005 0.009 0.010 Wetland Type Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Mapped Soil Series Cid-Lignum Cid-Lignum Cid-Lignum Cid-Lignum Cid-Lignum Cid-Lignum Cid-Lignum Drainage Class Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Moderately to Somewhat Poorly Drained Soil Hydric Series Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Wehadkee, Undrained Source of Hydrology Groundwater / Overbank Flooding Groundwater / Overbank Flooding Groundwater / Overbank Flooding Groundwater / Overbank Flooding Groundwater / Overbank Flooding Groundwater / Overbank Flooding Groundwater / Overbank Flooding Hydrologic Impairment N/A N/A N/A N/A N/A N/A N/A Native Vegetation Community Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest Bottomland Hardwood Forest % Composition Invasive Species 10% 15% 10% 0% 10% 15% 5% Maney Farm Mitigation Project Final Mitigation Plan Page 19 5.2 Threatened and Endangered Species 5.2.1 Site Evaluation Methodology The Endangered Species Act (ESA) of 1973, amended (16 U.S.C. 1531 et seq.), defines protection for species with Federal Classification of Threatened (T) or Endangered (E). An “Endangered Species” is defined as “any species which is in danger of extinction throughout all or a significant portion of its range” and a “Threatened Species” is defined as “any species which is likely to become an Endangered Species within the foreseeable future throughout all or a significant portion of its range” (16 U.S.C. 1532). Wildlands utilized the US Fish and Wildlife Service (USFWS) and NC Natural Heritage Program (NHP) databases to search for federally listed threatened and endangered plant and animal species in Chatham County, NC. Four federally listed species; the red-cockaded woodpecker (Picoides borealis), the bald eagle (Haliaeetus leucocephalus), Cape Fear shiner (Notropis mekistocholas), and harperella (Ptilimnium nodosum) are currently listed in Chatham County (Table 8). The Categorical Exclusion (included in Appendix 9) has been approved by the Federal Highway Administration. Table 9: Listed Threatened and Endangered Species in Chatham County, NC Maney Farm Mitigation Project Species Federal Status Habitat Biological Conclusions Vertebrate Red-cockaded woodpecker (Picoides borealis) E Open stands of mature pines No affect Bald eagle (Haliaeetus leucocephalus) BGPA Near large open water bodies: lakes, marshes, seacoasts, and rivers May affect, but not likely to adversely affect Cape Fear shiner (Notropis mekistocholas) E Pools, riffles, and runs of rocky, clean freshwater streams No affect Vascular Plant Harperella (Ptilimnium nodosum) E Rocky or gravely sholas of clear swift-moving streams May affect, but not likely to adversely affect BGPA = Bald and Golden Eagle Protection Act 5.2.2 Threatened and Endangered Species Descriptions Red-cockaded woodpecker The red-cockaded woodpecker is a medium-sized woodpecker species (8 to 9 inches in length). Distinctive coloration includes black and white feathers with a large white cheek patch and a black back with a white barred pattern. This species is typically found year-round in large open stands of pines with mature trees of 60+ years in age. The foraging habitat for this species may include pine hardwood stands of longleaf and southern pine, 30+ years in age. Occurrences of the red-cockaded woodpecker are listed as historic within Chatham County. Maney Farm Mitigation Project Final Mitigation Plan Page 20 Bald eagle The bald eagle is a very large raptor species, typically 28 to 38 inches in length. Adult individuals are brown in color with a very distinctive white head and tail. Bald eagles typically live near large bodies of open water with suitable fish habitat including lakes, marshes, seacoasts, and rivers. This species generally requires tall, mature tree species for nesting and roosting. Bald eagles were de- listed from the Endangered Species List in June 2007; however, this species remains under the protection of the Migratory Bird Treaty Act and the Bald and Golden Eagle Protection Act (BGPA). This species is known to occur in every U.S. state except Hawaii. Cape Fear shiner The Cape Fear shiner is a small minnow fish species, typically 2 inches in length. This species is pale silvery yellow in color with a black stripe along each side and yellow fins. Water willow beds in flowing areas of creeks and rivers appear to be part of the essential habitat for this species. Individuals can be found in pools, riffles, and slow runs of clean, rocky streams composed of gravel, cobble, and boulder substrates. Critical habitat for this species within Chatham County includes approximately 4.1 miles of the Rocky River from the NC-902 bridge downstream to the County Road 1010 Bridge. Additional critical habitat includes 0.5 mile of Bear Creek from the County Road 2156 bridge downstream to the Rocky River and 4.2 miles downstream within the Rocky River to 2.6 miles of the Deep River. Harparella Harperella is an obligate, annual vascular plant ranging in height from 6 to 36 inches. This plant exhibits small white clusters of flowers at the stem tops similar to Queen Anne’s lace. This species typically flowers from May until the first frost. Ideal habitat for this species includes pond and riverine areas with gravelly shoals of clear, swift-flowing streams. These areas typically require moderately intensive spring floods to scour gravel bars and rock crevices to remove any competing vegetation. Known population occurrences of harperella have been observed in Chatham County within the past 20 years. 5.2.3 Biological Conclusions Based on a pedestrian survey of the Site that was performed on May 28 and 29, 2014; no individual species or critical habitat was found to exist on the Site. Wildlands requested comment on the project from both the USFWS and the North Carolina Wildlife Resource Commission (NCWRC) on February 26, 2014. NCWRC responded on March 14, 2014 and stated they “do not anticipate the project to result in significant adverse impacts to aquatic and terrestrial resources.” The USFWS responded on April 4, 2014 and concurred with NCWRC stating that “the proposed action is not likely to adversely affect any federally-listed endangered or threatened species, their formally designated critical habitat, or species currently proposed for listing under the Act.” All correspondence is located in Appendix 9. 5.3 Cultural Resources 5.3.1 Site Evaluation Methodology The National Historic Preservation Act (NHPA) of 1966, as amended (16 U.S.C. 470), defines the policy of historic preservation to protect, restore, and reuse districts, sites, structures, and objects significant in American history, architecture, and culture. Section 106 of the NHPA mandates that Maney Farm Mitigation Project Final Mitigation Plan Page 21 federal agencies take into account the effects of their undertakings on any property that is included in, or is eligible for inclusion in, the National Register of Historic Places. 5.3.2 SHPO/THPO Concurrence Wildlands requested review and comment from the State Historic Preservation Office (SHPO) with respect to any archeological and architectural resources related to the Site on February 26, 2014. The SHPO responded on March 24, 2014 and stated they were not aware of any historic resources that would be affected by the project. All correspondence related to this is located in Appendix 9. 5.4 FEMA Floodplain Compliance and Hydrologic Trespass The Site is represented on the Chatham County Flood Insurance Rate Map Panels 8784 and 8796 (Figure7). There are no Federal Emergency Management Agency (FEMA) regulated floodplain areas on the Site. Email correspondence with the Chatham County Public Works Director pertaining to floodplain development permitting is included in Appendix 10 along with the FEMA/DMS checklist. The project will be designed so that any increase in flooding will be contained on the Site and will not extend upstream to adjacent parcels, so hydrologic trespass will not be a concern. The proposed restoration has been designed to transition back to the existing boundary conditions in a gradual manner. 6.0 REFERENCE SITES 6.1 Reference Streams Reference streams provide geomorphic parameters of a stable system, which can be used to design stable channels of similar stream types in similar landscapes and watersheds. Four reference reaches were identified near the Site and used to support the design of the proposed restoration (Figure 8). A range of reference reach metrics were utilized in order to properly tie in the enhancement reach confluences with the restoration reaches. These reference reaches were chosen because of their similarities to the project streams to be restored including drainage area, valley slope, morphology, and bed material. The reference reaches are within the Carolina Slate Belt region of the Piedmont. Geomorphic parameters for these reference reaches are summarized in Table 10. 6.2 Channel Morphology and Classification of Reference Streams The Agony Acres reference reach (UT1A – Reach 1) is located in northeast Guildford County, NC. It was identified as a high quality preservation area on the Agony Acres Mitigation Site in the mitigation plan submitted in March, 2014 and was used as a reference reach for that project. Wildlands performed a detailed morphologic survey in March of 2013. The Agony Acres reference reach has a drainage area of 0.3 square miles and is classified as a Rosgen E4 stream type. While the slope range on the reference reach is slightly higher than the design reach, this reference site was specifically chosen because of a similar drainage area and discharge as that of UTSF. The UT to Cane Creek reference reach is located in southern Alamance County and is classified as a Rosgen E4 stream type. Wildlands conducted a site visit and surveyed an additional cross section typical of the reference reach in 2012. The reach has a drainage area of 0.28 square miles and flows through a mature forest. The site is similar to stream reaches at Maney Farm in valley type and slope. Maney Farm Mitigation Project Final Mitigation Plan Page 22 The UT to Varnals reference reach is located in south central Alamance County, NC near the Cane Creek Mountains. The site was identified by EcoLogic Associates and used as a reference reach for the Reedy Branch stream restoration site (EcoLogic Associates, 2002). Wildlands visited UT to Varnals in September, 2014 and visually confirmed that the land use is unchanged from reported conditions and that the stream is laterally and vertically stable. Wildlands conducted a detailed morphological survey in October, 2014. UT to Varnals has a drainage area of 0.41 square miles and is classified as a Rosgen E4 stream type for the majority of the reach. There are portions of the stream where the valley constricts reducing the entrenchment ratio below those typical for Rosgen type E channels and more towards those typical for Rosgen B type channels. This shift between a B and E type channels suits the design for tying in the UT1, UT2, UT3, and UT4 reaches to UTSF. Maney Farm Mitigation Project Final Mitigation Plan Page 23 Table 10: Summary of Reference Reach Geomorphic Parameters Maney Farm Mitigation Project Notation Units Agony Acres UT1A - Reach 1 UT to Cane Creek UT to Varnals Creek Min Max Min Max Min Max stream type E4 E4 E4 drainage area DA sq mi 0.30 0.29 0.41 design discharge Q cfs 25.3 40.0 54.0 bankfull cross-sectional area Abkf SF 10.7 11.3 8.9 12.2 10.3 12.3 average velocity during bankfull event vbkf fps 2.2 2.4 3.8 4.4 5.2 width at bankfull wbkf feet 9.1 10.4 11.5 12.3 9.3 10.5 maximum depth at bankfull dmax feet 1.8 1.2 1.6 1.5 1.7 mean depth at bankfull dbkf feet 1.0 1.2 0.8 1.0 1.1 1.2 bankfull width to depth ratio wbkf/dbkf 7.3 10.1 12.3 14.4 8.1 9.3 depth ratio dmax/dbkf feet 1.8 1.5 1.6 1.4 bank height ratio BHR 1.0 N/A 0.9 1.0 floodprone area width wfpa feet >36 31 20 64 entrenchment ratio ER >3.9 2.5 2.7 1.9 6.1 valley slope Svalley feet/ foot 0.010 0.034 0.026 0.020 channel slope Schnl feet/ foot 0.004 0.028 0.015 0.017 riffle slope Sriffle feet/ foot N/A 0.0188 0.0704 0.024 0.057 riffle slope ratio Sriffle/Schnl N/A 1.3 4.7 1.4 3.4 pool slope Sp feet/ foot N/A 0.001 0.011 0.000 0.015 pool slope ratio Sp/Schnl N/A 0.0 0.7 0.0 0.9 pool-to-pool spacing Lp-p feet N/A 27 73 8 82 pool spacing ratio Lp-p/wbkf N/A 2.3 6.1 0.5 5.6 Maney Farm Mitigation Project Final Mitigation Plan Page 24 Notation Units Agony Acres UT1A - Reach 1 UT to Cane Creek UT to Varnals Creek Min Max Min Max Min Max pool cross-sectional area Apool SF 14.5 11.9 22.0 22.7 pool area ratio Apool/Abkf 1.3 1.0 1.3 1.8 1.9 maximum pool depth dpool feet 2.5 1.8 2.3 2.5 2.6 pool depth ratio dpool/dbkf 2.3 2.3 3.0 3.1 pool width at bankfull wpool feet 9.4 8.5 15.1 18.6 pool width ratio wpool/wbkf 1.0 0.7 1.0 1.3 sinuosity K 1.35 1.40 1.20 belt width wblt feet 21 93 102 15 45 meander width ratio wblt/wbkf 2.3 8.9 8.3 8.9 1.0 3.0 meander length Lm feet -- -- -- -- -- -- meander length ratio Lm/wbkf -- -- -- -- -- -- radius of curvature Rc feet 14 60 23 38 8 47 radius of curvature ratio Rc/ wbkf 1.5 5.8 2.0 3.1 0.6 3.2 Maney Farm Mitigation Project Final Mitigation Plan Page 25 7.0 DETERMINATION OF CREDITS Mitigation credits presented in Table 11 are projections based on site design. Upon completion of site construction, the project components and credits data will be revised to be consistent with the as-built condition. Table 11: Determination of Credits Maney Farm Mitigation Project Mitigation Credits Stream Riparian Wetland Non-riparian wetland Buffer Nitrogen Nutrient Offset Phosphorus Nutrient Offset Type R RE R RE R RE Totals 4,922 0 N/A N/A N/A N/A N/A N/A N/A Project Components Project Component or Reach ID Existing Footage/ Acreage Proposed Stationing Location Approach (P1, P2, etc) Restoration (R) or Restoration Equivalent (RE) Restoration Footage or Acreage Mitigation Ratio Proposed Credit UTSF-R1 2,298 100+00-121+63 P1 R 2,122 1:1 2,122 UTSF-R2 1,209 121+63 - 132+24 P1 R 1,061 1:1 1,061 UT1A 390 250+00 - 253+90 E2 R 390 2.5:1 156 UT1B 101 199+08 - 200+00 E2 R 92 2.5:1 37 UT1C 166 200+00 - 202+60 E1 R 260 1.5:1 173 UT2A 485 295+15 - 300+00 E2 R 484 2.5:1 194 UT2B 44 300+00 - 300+74 E1 R 73 1.5:1 49 UT3A 418 395+79 - 400+00 E2 R 421 2.5:1 168 UT3B 84 400+00 - 401+63 E1 R 162 1.5:1 108 UT4A 217 497+87 - 500+00 E2 R 212 2.5:1 85 UT4B 40 500+00 - 501+38 E1 R 138 1.5:1 92 UT5 778 602+00 - 608+77 P1 R 677 1:1 677 Component Summation Restoration Level Stream (LF) Riparian Wetland (Acres) Non-Riparian Wetland (AC) Buffer (sq.ft.) Upland (AC) Restoration 3,860 N/A N/A N/A N/A Enhancement N/A N/A N/A N/A N/A Enhancement I 633 N/A N/A N/A N/A Enhancement II 1,599 N/A N/A N/A N/A Creation N/A N/A N/A N/A N/A Preservation N/A N/A N/A N/A N/A Maney Farm Mitigation Project Final Mitigation Plan Page 26 8.0 CREDIT RELEASE SCHEDULE All credit releases will be based on the total credit generated as reported by the as-built survey of the mitigation site. Under no circumstances shall any mitigation project be debited until the necessary DA authorization has been received for its construction or the District Engineer (DE) has otherwise provided written approval for the project in the case where no DA authorization is required for construction of the mitigation project. The DE, in consultation with the Interagency Review Team (IRT), will determine if performance standards have been satisfied sufficiently to meet the requirements of the release schedules below. In cases where some performance standards have not been met, credits may still be released depending on the specifics of the case. Monitoring may be required to restart or be extended, depending on the extent to which the Site fails to meet the specified performance standard. The release of project credits will be subject to the criteria described in Table 12. Table 12: Credit Release Schedule – Stream Credits Maney Farm Mitigation Project Monitoring Year Credit Release Activity Interim Release Total Released 0 Initial Allocation – see requirements below 30% 30% 1 First year monitoring report demonstrates performance standards are being met 10% 40% 2 Second year monitoring report demonstrates performance standards are being met 10% 50% (60%*) 3 Third year monitoring report demonstrates performance standards are being met 10% 60% (70%*) 4 Fourth year monitoring report demonstrates performance standards are being met 5% 65% (75%*) 5 Fifth year monitoring report demonstrates performance standards are being met 10% 75% (85%*) 6 Sixth year monitoring report demonstrates performance standards are being met 5% 80% (90%) 7 Seventh year monitoring report demonstrates performance standards are being met and the project has received closeout approval 10% 90% (100%) *Numbers reported without parenthesis account for the 10% of credits that are withheld until two bankfull events have occurred. Refer to Section 8.2. 8.1 Initial Allocation of Released Credits The initial allocation of released credits, as specified in the mitigation plan, can be released by the NCDMS without prior written approval of the DE upon satisfactory completion of the following activities: a. Approval of the Final Mitigation Plan b. Recordation of the preservation mechanism, as well as a title opinion acceptable to the USACE covering the property. c. Completion of project construction (the initial physical and biological improvements to the mitigation site) pursuant to the mitigation plan; Per the NCDMS instrument, construction Maney Farm Mitigation Project Final Mitigation Plan Page 27 means that a mitigation site has been constructed in its entirety, to include planting, and an as-built report has been produced. As-built reports must be sealed by and engineer prior to project closeout, if appropriate but not prior to the initial allocation of released credits. d. Receipt of necessary DA permit authorization or written DA approval for project where DA permit issuance is not required. 8.2 Subsequent Credit Releases All subsequent credit releases must be approved by the DE and in consultation with the IRT and are based on a determination that required performance standards have been achieved. For stream projects a reserve of 10% of a site’s total stream credits shall be released after two bankfull events have occurred in separate years, provided the channel is stable and all other performance standards are met. In the event that less than two bankfull events occur during the monitoring period, release of these reserve credits shall be at the discretion of the IRT. As projects approach milestones associated with the credit release, the NCDMS will submit a request for credit release to the DE along with documentation substantiating achievement of criteria required for release to occur. This documentation will be included with the annual monitoring report. 9.0 PROJECT SITE MITIGATION PLAN 9.1 Justification for Proposed Intervention The primary project goals and objectives described in Section 1.0 are focused on improving the ecological function of the Site including a reduction in sedimentation and fecal coliform concentrations. The existing conditions assessment demonstrates that the tributaries to UT to South Fork Cane Creek on-site have been degraded due to livestock access and the removal of riparian vegetation. The bedforms of the tributaries’ channels are highly degraded due to trampling by cattle and a fining of bed material from bank erosion and mass wasting of bank material. The riparian vegetation has been heavily altered along the streambanks. Intervention in the form of restoration and enhancement is needed to rectify these problems. 9.2 Stream Restoration and Enhancement Design Overview Wildlands proposes to utilize a restoration approach along UTSF and UT5. Short reaches at the downstream extent of UT1, UT2, UT3, and UT4 are moderately incised, trampled by cattle, and exhibit instability in the form of headcuts and unstable banks. These reaches will also be restored to support the construction stable confluences with the restored UTSF. The restoration activities being proposed along UT1, UT2, UT3 and UT4 would typically justify a 1:1 ratio. However, these reaches were initially proposed as enhancement and, for this reason, Widlands proposes a 1.5 to 1 credit ratio. Minimal intervention (Enhancement II) is being proposed along the majority of these tributary channels (i.e., the upper reaches of UT1, UT2, UT3, and UT4). An Enhancement II approach will prevent cattle from accessing these tributaries, will support the reestablishment of functioning stream and riparian ecosystems, and will protect those ecosystems from further damage. In addition, planting activities will reestablish a thriving riparian buffer. Mitigation activities are illustrated in the enclosed Figure 9. 9.3 Design Discharge Analysis Multiple methods (e.g., regional curves, hydraulic geometry relationships, regional flood frequency analysis, etc.) were used to develop estimates for each of the project restoration reaches of either Maney Farm Mitigation Project Final Mitigation Plan Page 28 the bankfull discharge or a discharge corresponding to a return interval similar to the theoretical return interval of the bankfull discharge. The resulting values were compared and concurrence between the estimates was assessed. The purpose of using multiple methods to estimate bankfull discharge is to eliminate reliance on a single method as the basis of channel design. However, the methods commonly produce significantly different results so professional judgement must be used to select a design discharge. For this analysis the greatest weight was placed on the Wildlands Flood Frequency Regression equation for the 1.2-yr discharge and the two sets of published regional curve data. Each of methods used to estimate discharge are described below and the results are summarized in Table 13 and on Figure 10. 9.3.1 NC Rural Piedmont Regional Curve Predictions The published NC rural Piedmont Curve (Harman et al., 1999) was used to estimate discharge based on the drainage area for each design reach. 9.3.2 Provisional Updated NC Piedmont/Mountain Regional Curve Predictions Design discharges using the draft updated curve for rural Piedmont and mountain streams (Walker, unpublished) were estimated based on drainage area for each design reach. 9.3.3 Regional Flood Frequency Analysis Five U.S. Geological Survey (USGS) stream gage sites were identified within reasonable proximity of the project site for use in development of a project specific regional flood frequency analysis. The Hosking and Wallis (1993) homogeneity test was performed with a statistics software package to verify that the gauges selected are appropriate. The gages used were:  USGS 02096740 – Gun Branch near Alamance, NC (DA = 4.06 mi2)  USGS 02096846 – Cane Creek near Orange Grove, NC (DA = 7.54 mi2)  USGS 02097010 – Robeson Creek near Pittsboro, NC (DA = 1.71 mi2)  USGS 02101030 – Falls Creek near Bennett, NC (DA = 3.43 mi2)  USGS 0210166029 – Rocky River at SR1300 near Crutchfield Crossroads, NC (DA = 7.42 mi2) Flood frequency curves were developed for the 1.2-year and 1.5-year recurrence interval discharges. These relationships can be used to estimate discharge of those recurrence intervals for ungauged streams in the same hydrologic region and were solved for discharge with the drainage area for each project reach as the input. 9.3.4 USGS Flood Frequency Equations for Rural Watersheds in North Carolina USGS flood frequency equations for rural watersheds in North Carolina (Weaver et al., 2009) were used to estimate peak discharges for each reach for floods with a recurrence interval of two years. Table 13, below, shows results for all of the aforementioned methods of calculating a design discharge as well as the design discharge chosen for each reach. Maney Farm Mitigation Project Final Mitigation Plan Page 29 Table 13: Summary of Design Bankfull Discharge Analysis Maney Farm Mitigation Project (unit of measurement is CFS unless otherwise noted) UTSF-R1 UTSF-R2 UT1C UT2B UT3B UT4B UT5 DA (acres) 115 211 22 11 11 20 76 DA (sq. mi.) 0.18 0.33 0.03 0.02 0.02 0.03 0.12 Wildlands Flood Frequency Regression Equation Estimates 1-yr event 6 10 2 1 1 1 4 1.2-yr event 22 34 6 4 4 6 16 1.5-yr event 32 50 10 6 6 9 24 1.8-yr event 39 61 12 7 7 11 29 2-yr event 43 67 13 8 8 12 32 Manning's equation results at surveyed XS XS1 4.1 XS2 5.7 XS3 4.8 XS4 8.0 7.3 XS5 Pool 12 XS6 Pool 6.9 XS7 7.8 5.5 XS8 11 XS9 6.9 XS10 4.1 9.6 XS11 10 5.4 XS12 Pool 8.9 XS13 11.0 XS14 Pool 9.3 Piedmont Regional Curve Bankfull 26 40 8 5 5 7 19 Alan Walker Curve Bankfull 15 23 4 2 2 4 10 Lowther Curve Bankfull 33 38 21 18 18 21 30 Regional Flood Frequency Analysis 1.2-yr event 12 18 3 2 2 3 8 1.5-yr event 18 29 5 3 3 5 13 1.8-yr event 24 37 7 4 4 6 17 Final Design Q 19 29 6 3.6 3.5 5.3 14 Note: Units for all discharge estimates are cubic feet per second. 9.4 Design Channel Morphologic Parameters Design parameters were developed for restoration reaches based on the design bankfull discharge, dimensionless ratios from the reference reach data, and professional judgment of the designers. The restoration reaches were designed to be similar to type C streams according to the Rosgen classification system (Rosgen, 1996). Type C streams are slightly entrenched, meandering streams with access to the floodplain (entrenchment ratios >2.2), and channel slopes of 2% or less. They occur within a wide range of valley types and are appropriate for the project landscape. The design morphological parameters are shown in Table 14. Maney Farm Mitigation Project Final Mitigation Plan Page 30 Table 14: Design Morphological Parameters Maney Farm Mitigation Project Notation Units UTSF-R1 UTSF-R2 UT1C UT2B UT3B UT4B UT5 Min Max Min Max Min Max Min Max Min Max Min Max Min Max stream type C C C C C C C drainage area DA sq mi 0.18 0.33 0.03 0.02 0.02 0.03 0.12 design discharge Q cfs 19.0 29.0 5.6 3.6 3.5 5.3 11.0 bankfull cross-sectional area Abkf SF 6.5 10.2 5.2 1.5 1.5 1.9 4.1 average velocity during bankfull event vbkf fps 3.0 2.8 1.1 3.1 3.3 3.3 2.9 width at bankfull wbkf feet 9.5 12.1 8.1 4.0 4.0 5.0 7.2 maximum depth at bankfull dmax feet 1.0 1.2 1.2 1.5 0.9 1.2 0.5 0.7 0.5 0.7 0.5 0.7 0.8 1.0 mean depth at bankfull dbkf feet 0.7 0.8 0.6 0.4 0.4 0.4 0.6 bankfull width to depth ratio wbkf/dbkf 14.0 14.0 13.0 11 11 13 13.0 depth ratio feet 1.4 1.8 1.4 1.8 1.4 1.8 1.4 1.8 1.4 1.8 1.4 1.8 1.4 1.8 bank height ratio BHR 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 floodprone area width wfpa feet 21 48 27 61 18 41 9 20 9 20 11 25 16 36 entrenchment ratio ER 2.2 5.0 2.2 5.0 2.2 5.0 2.2 5.0 2.2 5.0 2.2 5.0 2.2 5.0 valley slope Svalley feet/ foot 0.0129 0.0114 0.0083 0.0080 0.0170 0.0073 0.0138 channel slope Schnl feet/ foot 0.0092 0.0108 0.0081 0.0095 0.0066 0.0075 0.0064 0.0073 0.0147 0.0167 0.0058 0.0066 0.0099 0.0115 riffle slope Sriffle feet/ foot 0.0120 0.0505 0.0106 0.0447 0.0086 0.0355 0.0083 0.0342 0.0191 0.0786 0.0088 0.0312 0.0128 0.0541 riffle slope ratio Sriffle/Schnl 1.3 4.7 1.3 4.7 1.3 4.7 1.3 4.7 1.3 4.7 1.3 4.7 1.3 4.7 pool slope Sp feet/ foot 0.0000 0.0044 0.0000 0.0029 0.0000 0.0007 0.0000 0.0114 0.0000 0.0126 0.0000 0.0119 0.0000 0.0053 pool slope ratio Sp/Schnl 0.00 0.40 0.00 0.40 0.00 0.40 0.00 0.40 0.00 0.40 0.00 0.40 0.00 0.40 pool-to-pool spacing Lp-p feet 3 67 4 85 2 44 1 24 1 24 2 31 2 44 pool spacing ratio Lp-p/wbkf 0.3 7.0 0.3 7.0 0.3 6.1 0.3 6.1 0.3 6.1 0.3 6.1 0.3 6.1 pool cross-sectional area SF 8.5 13.0 13.3 20.4 6.7 10.4 2.0 3.0 2.0 3.0 2.4 3.8 5.3 8.2 pool area ratio 1.3 2.0 1.3 2.0 1.3 2.0 1.3 2.0 1.3 2.0 1.3 2.0 1.3 2.0 maximum pool depth feet 1.1 2.1 1.3 2.6 0.9 1.8 0.6 1.2 0.6 1.2 0.6 1.2 0.9 1.8 pool depth ratio 1.6 3.1 1.6 3.1 1.6 3.1 1.6 3.1 1.6 3.1 1.6 3.1 1.6 3.1 pool width at bankfull feet 10.5 14.3 13.3 18.2 7.9 10.8 4.4 6.0 4.4 6.0 5.5 7.5 7.9 10.8 pool width ratio 1.1 1.5 1.1 1.5 1.1 1.5 1.1 1.5 1.1 1.5 1.1 1.5 1.1 1.5 Maney Farm Mitigation Project Final Mitigation Plan Page 31 Notation Units UTSF-R1 UTSF-R2 UT1C UT2B UT3B UT4B UT5 Min Max Min Max Min Max Min Max Min Max Min Max Min Max sinuosity K 1.2 1.4 1.2 1.4 1.1 1.25 1.1 1.25 1.1 1.25 1.1 1.25 1.2 1.4 belt width wblt feet 15 85 19 108 13 72 6 36 6 36 8 45 12 64 meander width ratio wblt/wbkf 1.6 8.9 1.6 8.9 1.6 8.9 1.6 8.9 1.6 8.9 1.6 8.9 1.6 8.9 meander length feet 29 156 36 198 24 133 12 66 12 66 15 82 22 118 meander length ratio 3.0 16.4 3.0 16.4 3.0 16.4 3.0 16.4 3.0 16.4 3.0 16.4 3.0 16.4 radius of curvature Rc feet 17 55 22 70 11 47 5 23 5 23 7 29 13 42 radius of curvature ratio Rc/ wbkf 1.8 5.8 1.8 5.8 1.3 5.8 1.3 5.8 1.3 5.8 1.3 5.8 1.3 5.8 Maney Farm Mitigation Project Final Mitigation Plan Page 32 9.5 Sediment Transport Analysis Wildlands assessed the watershed and stream channels to gain an understanding of the quantity of sediment supplied to the design reaches and how this supply has changed over time, and may change in the future. This was necessary to qualitatively understand the sediment supply for the design system. In unstable or rapidly changing watersheds or for streams with visual signs of high bedload supply, a detailed analysis including field data collection and capacity calculations may be necessary for proper design. The watershed study, detailed in Sections 4.1 and 4.2, included an assessment of historical land use changes, an evaluation of existing stream conditions, and a forecast of future land use changes during the life of the project. The results of this assessment indicate the land use on-site and within the contributing watershed has been utilized for hay or livestock production since 1972. The riparian buffer was reduced the prior to 1972 to maximize the area available to agricultural practices. The land cover patterns and land uses have been consistent for at least the past 40 years and based on the rural setting of this project the watershed is expected to remain stable for the foreseeable future. The sediment supply from the contributing watershed upstream of the project site is expected to remain small and stable. UTSF does shows signs of sediment deposition and aggradation, (visual observations of sediment accumulation and reported d50 values for the pavement and sub-pavement samples of less than 2mm). However, this sediment can be largely attributed to local bank erosion within the project site. Degradation of the project tributaries can be attributed to cattle trampling and the propagation of head cuts from the main stem. These observations suggest that the sediment load is predominately contributed by local factors within the project corridor and the sediment load contributed by the upstream watershed is relatively low. Restoration activities and cattle exclusion will address the local factors but the watershed conditions are not anticipated to change drastically due to the rural setting and consistent land use practices. 9.5.1 Capacity Analysis Based on the watershed assessment described above, the project streams currently appear to be supply limited (e.g. have capacity to move a sediment load greater than the supplied load). There is no reason to believe that the watershed will be altered in the future to increase the sediment yield. The restoration reaches have been designed to maintain or exceed the capacity of the existing channels and grade control structures (detailed in Section 9.6) have been utilized to prevent future incision. 9.5.2 Competence Analysis In natural streams, the shear stress in a channel increases corresponding to an increase in discharge until the point at which the stream is flowing full (bankfull) and gains access to the floodplain. The floodplain access disperses the flow and prevents further increases in shear stress within the channel. This relationship of shear stress, channel dimension and discharge influences erosion potential within the channel and the channels ability to transport certain sizes of sediment (competence). To support the competence analysis, the calculated shear stresses, for both exsiting and proposed conditions, were compared to determine if the proposed stream will be able to move the bed material within the channel and to support material sizing within the constructed riffles. The competence analysis for each project reach is described below and the results are included in Table 15. Maney Farm Mitigation Project Final Mitigation Plan Page 33 Unnamed Tributary to SF (Reach 1) Sieve analysis results (Appendix 5) of a pavement sample at indicate a d50 of 0.1 and a d85 of 1.7. The subpavement results for the d50 and d85 were 0.02 mm and 0.46 mm respectively. These results along with field observations indicate that, as a result of cattle trampling the stream bed, fine sediment has accumulated and covered the legacy bed material along UTSF Reach 1. The results of the UTSF Reach 1 shear stress analysis indicate that this reach has the competence to entrain particles up to 28.9 mm in size, much larger than the current substrate in the channel. This shear stress creates excess capacity which has contributed to incision that has been noted along the reach. Unnamed Tributary to SF (Reach 2) Results of the sieve analysis for UTSF Reach 2 indicate a pavement layer d50 of 19.0 mm and a d85 of 35.8 mm. The subpavement d50 indicated by the analysis is 5.7 mm and the d85 is 17.2 mm. The results of the UTSF Reach 2 shear stress analysis indicate that this reach has the competence to entrain particles up to 34.2 mm in size. This shear stress creates excess capacity which has contributed to incision along the reach. Unnamed Tributary 5 Results of the sieve analysis for UT5 suggest a d50 of 15.5 mm and a d85 of 30.8 for the pavement layer and a d50 of 0.4 mm and a d85 of 7.6 mm for the subpavement. The existing channel shear stress indicates that UT5 has the competence to entrain particles up to 14 mm. This shear stress does not indicate excess capacity for this reach and some deposition was observed along this reach. Table 15: Sediment Transport Competence Analysis Maney Farm Mitigation Project Parameter UTSF-R1 UTSF-R2 UT5 Particle Size from sub- pavement Sediment Sample Pavement Sub- pavement Pavement Sub- pavement Pavement Sub- pavement D50 (mm) 0.1 0.02 19.0 5.7 15.5 0.4 D85 (mm) 1.7 0.5 35.8 17.2 30.9 7.7 Existing Shear Stress (lb/ft2) 0.39 0.45 0.19 Movable Particle Size (mm) Shield curve 28.9 34.2 14.0 Proposed Shear Stress (lb/ft2) 0.42 0.44 0.37 Movable Particle Size (mm) Shield curve 31.7 33.0 27.5 Sediment Transport Design Considerations Based on the results of the watershed analysis and the proposed design which will eliminate the major sediment source (fines from on-side bank erosion and livestock trampling of streams) it is safe to assume that the design restoration reaches will have enough capacity to move the supplied sediment load. This assumption is based on the following: Maney Farm Mitigation Project Final Mitigation Plan Page 34  The upstream watershed has remained stable for decades and is drained by a network of small agricultural ditches that do not supply much sediment.  The upstream watershed is rural and landuse is not expected to change in the coming years or even decades.  The major sediment supply is derived from onsite reaches and this supply will be reduced due to the restoration.  The system does not appear to have a substantial bedload of coarse material. Based on this qualitative analysis a threshold channel design is appropriate and no further monitoring or modeling of bedload supply and transport capacity is warranted. The results of the competence analysis were utilized to support the design of the restoration reaches. Based on the data presented in Table 15, the competence of UTSF reaches 1 and 2 will remain essentially the same. Once the cattle are removed from the streams, the bed material will coarsen somewhat. However, the channels have the competence to move particles in the coarse gravel to small cobble size classes so additional aggradation is not expected to occur. Constructed riffles of coarse material (ranging from cobble to small boulders) and log sills will be used for grade control to prevent incision. For UT5 the shear stress will increase substantially. Signs of aggradation of small particle material have been observed in portions of this reach. The increase in shear stress should be enough to move this material while constructed riffles and log sills will also be used in this reach for grade control. In order to mimic the historic conditions and to discourage and /or prevent future incision, native rock material will be harvested from both the hill slope and the existing channel. Natural bed material will be harvested along UTSF Reach 2 and UT5 prior to backfilling the existing channel. This native material will be utilized to construct the proposed riffles along the design reaches, along with coarser material harvested from the hill slope. The gravel harvested from the hill slope is expected to fall within the range of 8 to 64 mm with an average d50 size of approximately 36 mm. It should be noted that, although the upstream sediment supply is not expected to change, fine bed materials from fluvial erosion and trampling of the banks will be eliminated or reduced after construction resulting in coarsening of the bed material. 9.6 Project Implementation 9.6.1 Grading and Installation of Structures UTSF and UT5 reaches will be improved through Priority I restoration techniques. New channels will be constructed offline with stable meander patterns mimicking natural Piedmont streams, and the beds of the channels will be raised so that the floodplains are inundated during flow events larger than the design bankfull discharge. Where necessary, floodplain grading will be conducted to slightly lower floodplain elevations resulting in a more natural exchange of organic matter and sediment between the stream and floodplain ecotones. The streambeds will be composed of alternating riffle-pool sequences to provide habitat and flow diversity. The cross-sectional dimensions of the channels will be reconstructed as designed with stable side slopes that are matted and planted with native vegetation for long-term stability. Brush toe built from on-site materials and sod mats harvested on-site will be used to protect banks and provide aquatic habitat. Enhancement I techniques will be used on UT1C, UT2B, UT3B, and UT4B. This approach will enhance bed features and reduce the level of incision of the existing channels and allow these reaches to be tied into the UTSF Priority I restoration reach. Maney Farm Mitigation Project Final Mitigation Plan Page 35 UT1A, UT1B, UT2A, UT3A, and UT4A will be improved through Enhancement II techniques. Treatment for these areas will include replanting the riparian buffer with native tree species, fencing out livestock, and treatment of any invasive species. There will be no alteration of floodplain grades or channel dimensions for these sections of stream. Additionally, streambanks at existing cattle crossings and wallow areas will be reconstructed, matted with coir fiber matting and planted with live stakes to improve stability and reduce scour. The entire riparian buffer will be planted with native vegetation, livestock will be fenced out, and invasive species will be treated. Instream structures will primarily include constructed riffles and log sills. Several types of constructed riffles will be utilized in the restoration reaches to establish a varied flow pattern, habitat, and grade control while providing a source of carbon for nutrient cycling. Native rock of various sizes (cobble, gravel, and fines) harvested on site will be used as much as possible to create these types of riffles. Types of riffles proposed for this site include:  Chunky riffles with larger (small boulder and large cobble) rock embedded throughout the length of the native rock riffle to provide additional habitat as well as grade control for steeper riffles.  Native material riffles to re-establish a large gravel substrate to the channels.  Woody riffles with brush and logs compacted into the bed of native rock to increase woody material in the channel.  Rock and Roll riffles to incorporate larger woody debris and meander the thalweg within longer riffles. 9.6.2 Riparian Planting As a final stage of construction, riparian buffers of restoration and enhancement reaches will be seeded and planted with early successional native vegetation chosen to create a Piedmont Bottomland Forest community. The specific species composition to be planted was selected based on the community type, observations of the occurrence of species in the existing buffer, and best professional judgment on species establishment and anticipated site conditions in the early years following project implementation. Species chosen for the planting plan are listed in Table 16. The riparian buffer areas will be planted with bare root seedlings. Areas within the riparian zone which currently support a mature overstory will be enhanced through a supplemental planting of shade tolerant understory shrub species. In addition, the stream banks will be planted with live stakes and the channel toe will be planted with plugs. Permanent herbaceous seed will be placed on stream banks, floodplain areas, and all disturbed areas within the project easement. Proposed planting zones and the associated species are shown in the construction plan set. Species planted as bare roots within the open pasture areas will be spaced at an initial density of 605 plants per acre based on 12-ft by 6-ft spacing (targeted densities after monitoring year 3 are 320 woody stems per acre). The supplemental shrub species planting will be spaced at an initial density of 300 plants per acre based on a 24-ft by 12-ft spacing. Live stakes will be planted on channel banks at a 2-ft to 3-ft spacing on the outside of meander bends and a 6-ft to 8-ft spacing on tangent sections. To help ensure tree growth and survival, soil amendments may be added to areas of floodplain cut. Soil tests will be performed in areas of cut and fertilizer and lime will be applied based on the results. Additionally, topsoil will be stockpiled, reapplied, and disked before permanent seeding and planting activities take place. Maney Farm Mitigation Project Final Mitigation Plan Page 36 Invasive species within the riparian buffers will be treated and/or removed at the time of construction. The extent of invasive species coverage will be monitored, mapped and controlled as necessary throughout the required monitoring period. Table 16: Planting List Maney Farm Mitigation Project Streambank Planting Zone (Live Stakes) Species Common Name Salix nigra Black Willow Cornus ammomum Silky Dogwood Salix sericea Silky Willow Physocarpos opulifolius Ninebark Streambank Planting Zone (Herbaceous Plugs) Juncus effusus Common Rush Carex alata Broadwing Sedge Panicum virgatum Switchgrass Buffer Planting Zone (Bare Root) Alnus serrulata Tag Alder Quercus phellos Willow Oak Platanus occidentalis Sycamore Betula nigra River Birch Aesculus pavia Red Buckeye Liriodendron tulipifera Tulip Poplar Quercus palustris Pin Oak Fraxinus pennsylvanica Green Ash Carpinus caroliniana American Hornbeam Viburnum prunifolium Blackhaw Viburnum Calycanthus floridus Sweetshrub Callicarpa americana American Beautyberry Symphoricarpos orbiculatus Coralberry Permanent Riparian Seeding Panicum rigidulum Redtop Panicgrass Agrostis hyemalis Winter Bentgrass Chasmanthium latifolium River Oats Rudbeckia hirta Blackeyed Susan Coreopsis lanceolata Lanceleaf Coreopsis Carex vulpinoidea Fox Sedge Panicum clandestinum Deertongue Elymus virginicus Virginia Wild Rye Asclepias syrica Common Milkweed Baptisia australis Blue False Indigo Gaillardia pulchella Annual Gaillardia Echinacea purpurea Pale Purple Coneflower Maney Farm Mitigation Project Final Mitigation Plan Page 37 10.0 MAINTENANCE PLAN The Site shall be monitored on a regular basis and a physical inspection of the Site shall be conducted at a minimum of once per year throughout the post-construction monitoring period until performance standards are met. These site inspections may identify the site components and features that require routine maintenance. Routine maintenance should be expected most often in the first two years following site construction and may include the following features listed in Table 17 below. Table 17: Maintenance Plan Maney Farm Mitigation Project Component / Feature Maintenance Through Project Close-Out Stream Routine channel maintenance and repair activities may include chinking of in-stream structures to prevent piping, securing loose coir matting, and supplemental installations of live stakes and other target vegetation along the channel. Areas where stormwater and floodplain flows intercept the channel may also require maintenance to prevent bank failures and head -cutting. Beaver dams that inundate the streams channels shall be removed and the beaver sh all be trapped. Vegetation Vegetation shall be maintained to ensure the health and vigor of the targeted community. Routine vegetation maintenance and repair activities may include supplemental planting, pruning, mulching, and fertilizing. Exotic invasive plant species shall be controlled by mechanical and/or chemical methods. Any vegetation control requiring herbicide application will be performed in accordance with the NC Department of Agriculture (NCDA) rules and regulations. Site Boundary Site boundaries shall be identified in the field to ensure clear distinction between the mitigation site and adjacent properties. Boundaries may be identified by fence, marker, bollard, post, tree-blazing, or other means as allowed by site conditions and/or conservation easement. Boundary markers disturbed, damaged, or destroyed will be repaired and/or replaced on an as -needed basis. 11.0 PERFORMANCE STANDARDS The stream and buffer performance criteria for the Site will follow approved performance criteria presented in the DMS Mitigation Plan Template (version 2.2, 06/08/2012), the DMS Monitoring Requirements and Performance Standards for Stream and/or Wetland Mitigation (11/7/2011), and the Stream Mitigation Guidelines issued in April 2003 by the USACE and NCDWR. Annual monitoring and semi-annual site visits will be conducted to assess the condition of the finished project. The stream restoration and enhancement sections and the buffer restoration sections of the project will be assigned specific performance criteria components for stream morphology, hydrology, and vegetation. Performance criteria will be evaluated throughout the seven year post- construction monitoring. At the conclusion of the fifth monitoring year, Wildlands may propose to terminate stream and/or vegetation monitoring if all performance criteria have been successfully met and two bankfull events have occurred during separate years. An outline of the performance criteria components follows. 11.1 Streams 11.1.1 Dimension Riffle cross-sections on the restoration reaches should be stable and should show little change in bankfull area, maximum depth ratio, and width-to-depth ratio. Per DMS guidance, bank height ratios shall not exceed 1.2 and entrenchment ratios shall be at least 2.2 for restored channels to be considered stable. Reach riffle cross-section dimension means should fall within the parameters Maney Farm Mitigation Project Final Mitigation Plan Page 38 defined for channels of the appropriate Rosgen stream type. If any changes do occur, these changes will be evaluated to assess whether the stream channel is showing signs of instability. Indicators of instability include a trend in vertical incision or eroding channel banks over the monitoring period. Remedial action would not be taken if channel changes indicate a movement toward stability. 11.1.2 Pattern and Profile Visual assessments and photo documentation should indicate that streams are remaining stable and do not indicate a trend toward vertical or lateral instability. 11.1.3 Substrate Substrate materials in the restoration reaches should indicate a progression towards or the maintenance of coarser materials in the riffle features and smaller particles in the pool features. 11.1.4 Bankfull Events Two bankfull flow events must be documented on the restoration reaches within the seven-year monitoring period. The two bankfull events must occur in separate years. Stream monitoring will continue until success criteria in the form of two bankfull events in separate years have been documented. 11.1.5 Photo Documentation Photographs should illustrate vegetative and morphological stability on an annual basis at the Site. Cross-section photos should demonstrate no excessive erosion or degradation of the banks. Longitudinal photos should indicate the absence of persistent bars within the channel or vertical incision. Grade control structures should remain stable. Deposition of sediment on the bank side of vane arms is preferable. Maintenance of scour pools on the channel side of vane arms is expected. 11.1.6 Vegetation The final vegetative success criteria for the stream restoration and enhancement areas will be based on the planted areas prescribed. Survival of 210 planted stems per acre in the standard planting zones at the end of the monitoring period is required. The interim measure of vegetative success within these areas will be the survival of at least 320 planted stems per acre at the end of the third monitoring year and at least 260 stems per acre at the end of the fifth year of monitoring. Planted trees within the standard planted zones must average 10 feet in height in each plot at the end of the seventh year of monitoring. If this performance standard is met by year five and stem density is trending towards success (i.e., no less than 260 five year old stems/acre), monitoring of vegetation on the Site may be terminated with written approval by the USACE in consultation with the Interagency Review Team. The extent of invasive species coverage will also be monitored and controlled as necessary throughout the required monitoring period. The supplemental planting of shade tolerant understory species will be monitored to determine survival rates of these species. However, the results will not be tied to project success and no performance standard is proposed. 11.1.7 Visual Assessment Visual assessments should support the specific performance standards for each metric as described above. Maney Farm Mitigation Project Final Mitigation Plan Page 39 12.0 MONITORING PLAN Annual monitoring data will be reported using the DMS Monitoring Report Template (version 1.5, 06/08/2012). The monitoring report shall provide project data chronology that will facilitate and understanding of project status and trends, population of DMS databases for analysis, research purposes, and assist in decision making regarding close-out. The monitoring period will extend seven years beyond completion of construction or until performance criteria have been met. All survey will be tied to grid. Project monitoring requirements in the sections above are described below and summarized in Table 18 and illustrated in Figure 11. 12.1 Streams 12.1.1 Dimensions In order to monitor the channel dimension, permanent cross-sections will be installed along riffle and pool sections according to DMS guidance. Two permanent cross-section will be installed per 1,000 feet of channel along the restored streams. Each cross-section will be permanently marked with pins to establish its location. Cross-section surveys will include points measured at all breaks in slope, including top of bank, bankfull, edge of water, and thalweg. Cross-sections will be surveyed annually for the seven year monitoring period. 12.1.2 Pattern and Profile The as-built survey will include a longitudinal profile for the baseline monitoring report. Longitudinal profile surveys will not be conducted during the seven year monitoring period unless other indicators during the annual monitoring indicate a trend towards vertical and/or lateral instability. If a longitudinal profile is deemed necessary, monitoring will follow standards as described in the DMS Monitoring Requirements and Performance Standards for Stream and/or Wetland Mitigation (11/07/2011) and the 2003 USACE and NCDWR Stream Mitigation Guidance for the necessary reaches. 12.1.3 Substrate A reach-wide pebble count will be performed in each restoration and enhancement level I reach (UTSF-R1, UTSF-R2, UT1C, UT2B, UT3B, UT4B, and UT5) each year for classification purposes. A pebble count will be performed at each surveyed riffle to characterize the bed material during the years of the cross-section survey. 12.1.4 Bankfull Events / Gauging Bankfull events will be documented using a crest gauge and/or pressure transducer, photographs, and visual assessments such as debris lines. Three gauges will be installed within a riffle section along UTSF Reaches 1 and 2 and UT5. The crest gauges will be installed within one of the surveyed riffle cross-sections. The gauges will be checked and/or downloaded at each site visit to determine if a bankfull event has occurred. Photographs will be used to document occurrences of debris lines and sediment deposition. An additional gauge with a pressure transducer will be installed within the intermittent reach of UTSF Reach 1 to record water surface elevations for a minimum of 30 days following the completion of construction activities. 12.1.5 Photo Documentation Photographs will be taken once a year to visually document stability for seven years following construction. Permanent markers will be established and located with GPS equipment so that the Maney Farm Mitigation Project Final Mitigation Plan Page 40 same locations and view directions on the Site are photographed each year. Photos will be used to monitor stream restoration and enhancement reaches as well as vegetation plots. Longitudinal reference photos will be established at the tail of riffles approximately every 200 LF along the channel by taking a photo looking upstream and downstream. Cross-sectional photos will be taken of each permanent cross-section looking upstream and downstream. Reference photos will also be taken for each of the vegetation plots. Representative digital photos of each permanent photo point, cross-section and vegetation plot will be taken on the same day the stream and vegetation surveys are conducted. The photographer will make every effort to consistently maintain the same area in each photo over time. 12.1.6 Vegetation Vegetation monitoring plots will be installed and evaluated within the restoration and enhancement areas to measure the survival of the planted trees. The number of monitoring quadrants required is based on the DMS monitoring guidance document (version 1.4, 11/17/11). The size of individual quadrants will be 100 square meters for woody tree species and shrubs. Vegetation monitoring plots will be installed to monitor both the standard planting areas as well as the supplemental planting zone areas. The number of monitoring plots to be installed in the planting zones are representative of the area proposed for each treatment type. Vegetation assessments will be conducted following the Carolina Vegetation Survey (CVS) Level 2 Protocol for Recording Vegetation (2006). The initial baseline survey will be conducted within 21 days from completion of site planting and used for subsequent monitoring year comparisons. The first annual vegetation monitoring activities will commence at the end of the first growing season, during the month of September. The restoration and enhancement sites will then be evaluated each subsequent year between June 1 and September 31. Species composition, density, and survival rates will be evaluated on an annual basis by plot and for the entire Site. Individual plot data will be provided and will include height, density, vigor, damage (if any), and survival. Planted woody stems will be marked annually as needed and given a coordinate, based off a known origin, so they can be found in succeeding monitoring years. Mortality will be determined from the difference between the previous year’s living planted stems and the current year’s living planted stems. 12.1.7 Visual Assessment Visual assessments will be performed along all stream and buffer restoration areas on a semi- annual basis during the seven year monitoring period. Problem areas will be noted such as channel instability (e.g. lateral and/or vertical instability, in-stream structure failure/instability and/or piping, headcuts), vegetation health (e.g. low stem density, vegetation mortality, invasive species or encroachment, beaver activity, or livestock access). Areas of concern will be mapped and photographed accompanied by a written description in the annual report. Problem areas will be re- evaluated during each subsequent visual assessment. Should remedial actions be required, recommendations will be provided in the annual monitoring report. Maney Farm Mitigation Project Final Mitigation Plan Page 41 Table 18: Monitoring Requirements. Maney Farm Mitigation Project Parameter Monitoring Feature Quantity/Length by Reach Frequency Notes UTSF R1 UTSF R2 UT1A UT1B UT1C UT2A UT2B UT3A UT3B UT4A UT4B UT5 Dimension Riffle Cross-Section 2 2 N/A N/A 1 N/A 1 N/A 1 N/A 1 1 Annual 1 Pool Cross-Section 2 1 N/A N/A 1 N/A 1 N/A 1 N/A 1 1 Pattern Pattern N/A N/A 2 Profile Longitudinal Profile N/A N/A Substrate Reach-Wide (RW) Riffle (RF) 100 Pebble Count 1 RW 2 RF 1 RW 2 RF N/A N/A 1 RW 1 RF N/A 1 RW 1 RF N/A 1 RW 1 RF N/A 1 RW 1 RF 1 RW 1 RF Annual Hydrology Stream Gauge 1 1 N/A N/A N/A N/A N/A N/A N/A N/A N/A 1 Annual 3 Vegetation Vegetation Plots 14 (11 Standard Planting Zones & 3 Supplemental Planting Zone) Annual Visual Assessment All Streams Y Bi-annual Exotic and Nuisance Vegetation Annual 4 Project Boundary Annual 5 Reference Photos Photos 32 Annual 6 Notes: 1. Cross-sections will be permanently marked with rebar to establish location. Surveys will include points measured at all breaks in slope, including top of bank, bankfull, edge of water, and thalweg. The number of cross-sections proposed was established using the small stream guidance of two per 1,000 feet of stream. 2. Entire profile will be surveyed during the as-built for all project streams. 3. One gauge will be installed along each restoration reach. Devices will be inspected quarterly or semi-annually, evidence of bankfull will be documented with a photo or gauge records. 4. Locations of exotic and nuisance vegetation will be recorded using a GPS and mapped. 5. Locations of fence damage, vegetation damage, boundary encroachments, etc. will be recorded using a GPS and mapped. 6. Markers will be established and recorded using a GPS so that the same locations and view directions on the Site are monitored. Maney Farm Mitigation Project Final Mitigation Plan Page 42 13.0 LONG-TERM MANAGEMENT PLAN The design of UT to South Fork Cane Creek and associated tributaries have been modeled after natural, functioning, and self-sustaining stable stream systems using natural materials to reinforce stability. This design approach along with the best available construction methods will provide for stability while on-site vegetation matures. This approach is intended to promote a self-sustaining stream system and eliminate the need for long-term management activities. Thus, no long-term management activities are anticipated for this site. The mitigation site will remain in private ownership and will be protected with a conservation easement based on the Full Delivery Conservation Easement model dated July 2011. The State will serve as the Grantee and will be responsible for inspecting and enforcing the CE following approval of the Final Mitigation Plan. Upon approval for close-out by the Interagency Review Team (IRT), the Site will be transferred to the NCDENR Division of Natural Resource Planning and Conservation’s Stewardship Program. This program currently houses DMS stewardship endowments within the non-reverting, interest- bearing Conservation Lands Stewardship Endowment Account. The use of funds from the Endowment Account is governed by North Carolina General Statute GS 113A-232(d)(3). Interest gained by the endowment fund may be used only for the purpose of stewardship, monitoring, stewardship administration, and land transaction costs, if applicable. The NCDENR Stewardship Program intends to manage the account as a non-wasting endowment. Only interest generated from the endowment funds will be used to steward the compensatory mitigation sites. Interest funds not used for those purposes will be re-invested in the Endowment Account to offset losses due to inflation. 14.0 ADAPTIVE MANAGEMENT PLAN Upon completion of site construction, DMS will implement the post-construction monitoring protocols previously defined in this document. Project maintenance will be performed as described previously in this document. If, during the course of annual monitoring it is determined the Site’s ability to achieve site performance standards are jeopardized, DMS will notify the USACE of the need to develop a Plan of Corrective Action. The Plan of Corrective Action may be prepared using in-house technical staff or may require engineering and consulting services. Once the Corrective Action Plan is prepared and finalized DMS will:  Notify the USACE;  Collaborate with the USACE and the IRT to finalize and secure authorization for the proposed remedial actions;  Revise performance standards, maintenance requirements, and monitoring requirements as necessary and/or required by the USACE;  Obtain any permits necessary to implement and complete the identified remedial actions; and  Implement the Corrective Action Plan and provide the USACE with record drawings that depict the extent and nature of the work performed. 15.0 FINANCIAL ASSURANCES Pursuant to Section IV and Appendix III of the Division of Mitigation Services In-Lieu Fee Instrument dated July 28, 2010, the North Carolina Department of Environment and Natural Resources has provided the US Army Corps of Engineers Wilmington District with a formal commitment to fund Maney Farm Mitigation Project Final Mitigation Plan Page 43 projects to satisfy mitigation requirements assumed by DMS. This commitment provides financial assurance for all mitigation projects implemented by the program. Maney Farm Mitigation Project Final Mitigation Plan Page 44 16.0 REFERENCES Harman, W.H., G.D. Jennings, J.M. Patteson, D.R. Clinton, L.O. Slate, A.G. Jessup, J.R. Everhart, and R.E. Smith. 1999. Bankfull Hydraulic Geometry Relationships for North Carolina Streams. AWRA Wildland Hydrology Symposium Proceedings. Edited By: D.S. Olsen and J.P. Potyondy. AWRA Summer Symposium. Bozeman, MT. North Carolina Center for Geographic Information and Analysis (NC CGIA). 2001. Landcover GIS layer. Accessed online at: http://data.nconemap.com/geoportal/catalog/main/home.page North Carolina Division of Water Resources (NCDWR). Surface Water Classifications. Accessed online at: http://portal.ncdenr.org/web/wq/ps/csu/classifications North Carolina Department of Environment and Natural Resources. 2005. Division of Water Quality (NCDWR). Cape Fear River Basinwide Water Quality Plan. Accessed online at: http://portal.ncdenr.org/c/document_library/get_file?uuid=2eddbd59-b382-4b58-97ed- c4049bf4e8e4&groupId=38364 North Carolina Division of Mitigation Services (DMS). Mitigation Plan Template Version 2.2, 06/08/2012. Accessed online at: http://portal.ncdenr.org/c/document_library/get_file?p_l_id=1169848&folderId=7135626&na me=DLFE-53020.pdf North Carolina Division of Mitigation Services (DMS). Monitoring Report Template Version 1.5, 06/08/2012. Accessed online at: http://portal.ncdenr.org/c/document_library/get_file?p_l_id=1169848&folderId=7135626&na me=DLFE-53021.pdf North Carolina Division of Mitigation Services (DMS). Monitoring Requirements and Performance Standards for Stream and/or Wetland Mitigation (11/7/2011). Accessed online at: http://portal.ncdenr.org/c/document_library/get_file?p_l_id=1169848&folderId=2288101&na me=DLFE-39234.pdf North Carolina Division of Mitigation Services (DMS). 2009. Cape Fear River Basin Restoration Priorities. Accessed online at: http://www.nceep.net/services/lwps/cape_fear/RBRP%20Cape%20Fear%202008.pdf North Carolina Geological Survey (NCGS), 1985. Geologic map of North Carolina 1:500,000 scale. Compiled by Philip M. Brown at el. Raleigh, NC, NCGS. North Carolina Natural Heritage Program (NHP). 2009. Natural Heritage Element Occurrence Database, Chatham County, NC. Accessed online at: http://ww.ncnhp.org/web/nhp/database- search North Carolina Wildlife Resources Commission. 2005. Wildlife Action Plan. Accessed online at: http://www.ncwildlife.org/portals/0/Conserving/documents/ActionPlan/WAP_complete.pdf Lagasse, P.F., Schall, J.D., Johnson, F., Richardson, E.V., Richardson, J.R., and Chang, F. 2001. Stream Stability at Highway Structures, Second Edition. U.S. Department of Transportation, Report No. FHWA-IP-90-014, HEC-20-ED-2. Washington, DC: Federal Highway Administration, 132 p. Rosgen, D.L. 1996. Applied River Morphology. Pagosa Springs, CO: Wildland Hydrology Books. Simon, A. 1989. A model of channel response in disturbed alluvial channels. Earth Surface Processes and Landforms 14(1):11-26. Soil Survey Staff, Natural Resources Conservation Service, United States Department of Agriculture. Maney Farm Mitigation Project Final Mitigation Plan Page 45 U.S. Army Corps of Engineers. 2012. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Eastern Mountains and Piedmont Region. Version 2.0. Accessed online at: http://www.usace.army.mil/Portals/2/docs/civilworks/regulatory/reg_supp/EMP_Piedmont_v 2b.pdf U.S. Army Corps of Engineers. 1987. Corps of Engineers Wetland Delineation Manual. Technical Report Y-87-1. Accessed online at: http://el.erdc.usace.army.mil/elpubs/pdf/wlman87.pdf U.S. Army Corps of Engineers, Hydrologic Engineering Center (HEC). 2010. HEC-RAS River Analysis System User’s Manual, Version 4.1. Accessed online at: http://www.hec.usace.army.mil/software/hec- ras/documentation/HECRAS_4.1_Users_Manual.pdf United States Department of Transportation, Federal Highway Administration (FHWA). 2006. Assessing Stream Channel Stability at Bridges in Physiographic Regions. Publication no. FHWA- HRT-05-072. McLean, VA.: Federal Highway Administration Office of Infrastructure Research and Development, 147 p. United States Fish and Wildlife Service (USFWS). 2008. Endangered Species, Threatened Species, Federal Species of Concern and Candidate Species, Chatham County, NC. Accessed online at: http://www.fws.gov/raleigh/species/cntylist/chatham.html Walker, Alan, unpublished. NC Rural Mountain and Piedmont Regional Curve. Web Soil Survey. Accessed online at: http://websoilsurvey.nrcs.usda.gov/. Accessed 12/5/2014. Weaver, J.C., T.D. Feaster, and A.J. Gotvald. 2009. Magnitude and Frequency of Rural Floods in the Southeastern United States, through 2006: Volume 2, North Carolina. U.S. Geological Survey Scientific Investigations Report 2009-5158, 111 p.