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HomeMy WebLinkAbout20160849 Ver 1_FINAL_URMB_Complete_Prospectus_20190613Upper Rocky Mitigation Bank Prospectus Prospectus for Stream and Wetland Compensatory Mitigation Credits For Yadkin River Basin (CU 03040105) 2017 Prepared by: WATER LAND SOLUTIONS 11030 Raven Ridge Rd, Suite 119. Raleigh, IAC 27614 919) 614-511) 1 waledandsokutians_com Table of Contents 1 Introduction..........................................................................................................................................1 2 Site Ownership......................................................................................................................................2 2.1 Sponsor Qualifications..................................................................................................................2 2.1.1 Similar Mitigation Projects in North Carolina and Other States...........................................2 3 Existing Conditions................................................................................................................................ 6 3.1 Watershed Characterization......................................................................................................... 6 3.1.1 South Prong West Branch Rocky River Watershed............................................................... 6 3.1.2 Historic Land Use and Development Trends in Project Watershed......................................7 3.1.3 Catchment Areas................................................................................................................... 7 3.2 Existing Condition of Streams.......................................................................................................8 3.2.1 Existing Channel Geomorphic Characterization....................................................................8 3.2.2 Reach Conditions of Proposed Site Streams.......................................................................10 3.3 Existing Condition of Wetlands...................................................................................................15 3.4 Potential Site Constraints............................................................................................................18 3.4.1 Existing Easements on the Site...........................................................................................18 3.4.2 Utility Corridors within the Site..........................................................................................19 3.4.3 Mineral or Water Rights Issues...........................................................................................19 3.4.4 Hydrologic Trespass............................................................................................................19 3.4.5 Invasive Species...................................................................................................................19 3.4.6 Cultural Resources..............................................................................................................19 3.4.7 Threatened and Endangered Species................................................................................. 20 3.4.8 Conditions Affecting Hydrology..........................................................................................20 3.4.9 Adjacent Land Use..............................................................................................................21 4 Proposed Site Conditions....................................................................................................................22 4.1 Objectives of Proposed Mitigation Site...................................................................................... 22 4.2 Conceptual Mitigation Plan.........................................................................................................22 4.3 Alternative Outcome without Bank............................................................................................24 4.4 Reference Ecosystems................................................................................................................ 24 5 Bank Establishment and Operation....................................................................................................25 5.1 Proposed Credit Types................................................................................................................ 25 5.2 Credit Release Schedule..............................................................................................................26 5.3 Service Area................................................................................................................................ 26 5.4 Proposed Financial Assurances...................................................................................................27 5.5 Long -Term Management............................................................................................................27 6 Citations.............................................................................................................................................. 28 Tables Table 1. Parcel Ownership Information........................................................................................................2 Table2. Subwatersheds................................................................................................................................8 Table3. Reach Descriptions..........................................................................................................................9 Table 4. Proposed Stream Mitigation Credits(SMCs)................................................................................25 Table 5. Proposed Wetland Mitigation Credits(WMCs)............................................................................25 Table 6. Credit Release Schedule...............................................................................................................26 Appendices AppendixA...........................................................................................................................................Figures Appendix B.......................................................................................................... Historic Aerial Photographs Appendix C................................................................................................................... Agent Authorizations Appendix D............................................................................................................. Baseline Monitoring Data Upper Rocky Mitigation Bank Prospectus 1 Introduction Water & Land Solutions, LLC (WLS) is pleased to submit this prospectus for the proposed Upper Rocky Mitigation Bank (Bank) located in the Yadkin River Basin, Hydrologic Unit Code (HUC) 03040105. The Bank will be set up under an umbrella mitigation bank structure that will establish an Umbrella Mitigation Banking Instrument (UMBI) for future mitigation sites. The first site in the umbrella mitigation bank is the Upper Rocky Mitigation Site (Site). This prospectus was prepared in accordance with C.F.R. §332.1-8 (2008), Compensatory Mitigation for Losses of Aquatic Resources, and was based on current District Guidance, which is subject to the approval of the United States Army Corps of Engineers in consultation with the NC Inter -Agency Review Team (NCIRT). The purpose of the Bank is to provide stream and wetland mitigation credits to compensate for unavoidable impacts to Waters of the U.S. authorized under section 401 and 404 of the Clean Water Act, Section 10 of the Rivers and Harbors Act, and all applicable state statutes. Water & Land Solutions Page 1 Upper Rocky Mitigation Bank Prospectus 2 Site Ownership WLS submits this prospectus on behalf of URMB, LLC ("Sponsor") forthe proposed Upper Rocky Mitigation Bank. URMB, LLC is wholly owned by WLS and was established to hold the Bank and conduct all business regarding the Bank. The point of contact for the Bank is Ashley Abernethy, whose contact info is listed below: Ashley Abernethy Water & Land Solutions, LLC 11030 Raven Ridge Rd, #119 Raleigh, NC 27614 919-614-5111 ashlev(@waterlandsolutions.com The Sponsor owns a permanent conservation easement on the JPO Beverly Tract and has options to purchase conservation easements on the Mayes Family Tract and Bjorneboe Tracts. The agent authorizations for the tracts are attached in Appendix C. The property owners for the proposed Site are listed in Table 1 below. TableOwnership Current Owner 68111 jJ Mayes Family LP Paul Bjorneboe Paul & Marie Bjorneboe JPO Beverly 2.1 Sponsor Qualifications WLS is a mitigation provider that concentrates on the production and delivery of high quality mitigation credits and services to clients across multiple regions of the United States. WLS was started with the purpose of combining the key components of high quality and successful mitigation sites, including the technical expertise for mitigation site development, the understanding of land management, and the expertise in environmental economics and finance. Through its inception WLS has identified, targeted and employed well-respected practitioners in the mitigation industry who have specifically focused their careers on all of the required aspects and stages of successful mitigation project implementation. Beyond our focus to improve ecological function of impaired systems, WLS has a specific mission to positively impact people in our industry and the general public through education, partnership, and relationship building. In just over two years since establishment, WLS has grown to a staff of eight people located in Raleigh, NC with satellite offices in Dallas, TX and Huntersville, NC. Individuals making up the WLS staff have been recognized by our industry colleagues and peers as leaders in the development, management, design, permitting, construction, and monitoring of mitigation projects. Our projects and opportunities that we are currently pursuing include projects in North Carolina, South Carolina, Texas, Virginia, and Ohio. 2.1.1 Similar Mitigation Projects in North Carolina and Other States WLS staff have significant experience with stream, wetland, and riparian buffer restoration. Our staff have been involved with the entire suite of services for hundreds of mitigation projects over Page 2 4 Upper Rocky Mitigation Bank Prospectus nearly two decades. This experience equates to the successful restoration of hundreds of thousands of feet of stream and thousands of acres of wetlands. Several project examples are highlighted below. Monteith Park Mitigation Site, Charlotte/Mecklenburg Stormwater Services, Huntersville, NC Monteith Park before (left) and one year after restoration (right) WLS is currently managing the successful completion of what is considered to be one of the most unique watershed restoration projects in the mitigation industry. The Monteith Park Mitigation Site (MPMS) is the only project to date in North Carolina that utilized a watershed restoration approach to generate additional mitigation credits at ratios beyond those typically awarded for stream and wetland restoration credits with the intent on properly funding full restoration activities. The MPMS was identified as one of the highest ranked stream restoration reaches in the McDowell Creek Watershed of Mecklenburg County, NC. The project involved the Rosgen Priority Level I restoration of 3,550 linear feet of stream, 1.0 acre of wetland restoration, and the retrofit design and installation of five stormwater control devices (bioretention basins) in an attempt to restore watershed hydrology to predevelopment conditions. WLS staff identified the project in 2008 and have led project management duties on all aspects of the project throughout its entirety. This complex mitigation project continues to be a highly successful example of how ecosystem restoration, that involves technical, legal, financial, political, and educational aspects, can be implemented in rapidly developing watersheds. Water & Land Solutions Page 3 Upper Rocky Mitigation Bank Prospectus Spindletop Bayou Mitigation Bank, Liberty and Chambers County, TX WLS is currently partnered with Ecosystem Renewal and EcoGenesis on a wetland and stream mitigation bank in Liberty County and Chambers County, Texas. The proposed 460 - acre bank site will restore over 400 acres of riparian and non -riparian wetlands and 10,000 linear feet of 1st order headwater streams. The proposed property has been highly impacted by agricultural practices (rice and sorghum production) since the 1930's. This project will provide significant uplift to aquatic and terrestrial habitats as well as water quality improvements to Spindletop Bayou. WLS has led coordination efforts with USACE-Galveston District IRT, assisted in the overall credit assessment, determination, generation, and full restoration design of the mitigation bank site. The proposed design finalized in the winter of 2016 and construction will likely occur in 2018. Cedar Bayou Mitigation Bank, Liberty County, TX the and was WLS is currently working with Ecosystem Renewal and EcoGenesis on a wetland and stream ecosystem mitigation bank in Liberty County, Texas. WLS is providing the lead technical services for the development of the Cedar Bayou Mitigation Bank (CBMB). The proposed 1,100 acre mitigation bank will provide over 900 acres of restored wetlands and 21,000+ linear feet of 1st order and 2nd order headwater stream in the Western Gulf Coastal Plain Ecoregion of the Galveston USACE District. This Upper Coastal Plain ecosystem will provide a complex mix of diverse habitats including multiple wetland types actively integrated with the headwater stream system. Due to over a century of agricultural practices on hard pan clay soils, this region experiences high flood frequency during large precipitation events. WLS will utilize a combination of Priority I and Priority II approaches to maximize ecological uplift, while creating sufficient flood storage capacity for large precipitation events, in what is expected to be the next high growth area for the Houston region. The project design will be finalized in 2017 with construction scheduled for 2018. Page 4 4 Edwards Mitigation Sites, Johnston County, NC The Edwards Sites (Sites) are three separate mitigation projects located adjacent to each other and within the same watershed that are being developed under the NCDMS Full Delivery Program. The Sites present a unique and exciting opportunity for the restoration of an entire subwatershed that has been highly impacted from agricultural practices for over a century. The Sites are 3 of 5 potential restoration projects being developed by WLS, all located adjacent to one another, that will successfully restore/enhance over 22,000 linear feet of stream and will permanently protect approximately 64 acres of riparian buffer corridor within a watershed that is expected to see widespread land use conversion from agriculture to suburban sprawl. The Sites have been negatively impacted by cattle grazing and row crop production since the 1950's. In addition, a portion of the streams have been impacted due to impoundments. Nearly all vegetated buffers along the stream reaches have been removed for agricultural practices. Wetlands were historically present throughout the riparian corridor, but have been significantly impacted due to cattle trampling and channel incision (draining wetland areas). Most of the primary stream systems have been channelized and incised (through headcut migration) leading to a significant loss of biologic function for the entire watershed. The comprehensive restoration of this subwatershed will provide significant habitat and water quality improvements to the on-site wetlands, streams, and riparian buffers as well as the downstream watershed. Upper Rocky Mitigation Bank Prospectus Water & Land Solutions Page 5 Upper Rocky Mitigation Bank Prospectus 3 Existing Conditions The proposed Site is located in Mecklenburg County, North Carolina in the Yadkin River Basin (Upper Rocky River), HUC 03040105. The Site centroid is located at 35.4596220, -80.829787° (Figure 1) and is adjacent to William Hough High School in Huntersville, NC. The proposed Site will protect approximately 43 acres in a permanent conservation easement. The easement is located on four parcels, which are used for residential and agricultural purposes. The first parcel is currently being subdivided and developed into single family homes on approximately 0.25 acre lots; 40 homes are slated for the proposed development. The easement will run through the open space reserved for this development. The second parcel contains a single family home, row crops, and non - timbered forest. The third parcel is currently in timber. The fourth parcel contains a single family home. 3.1 Watershed Characterization 3.1.1 South Prong West Branch Rocky River Watershed The headwaters of the Rocky River are separated into three primary subwatersheds: the South Prong West Branch Rocky River Watershed, the West Branch Rocky River, and the Upper Rocky River Watershed. The South Prong West Branch Rocky River Watershed, where the Site is located, includes the northern portion of Mecklenburg County and includes portions of the Towns of Cornelius, Davidson, and Huntersville, North Carolina. The South Prong West Branch of the Rocky River joins with the West Branch Rocky River to the East of Hopewell, NC. The West Branch Rocky Riverjoins with the Rocky River less than two miles downstream of this confluence along the Mecklenburg and Cabarrus County lines. The Rocky River is part of the Yadkin River Basin and joins with the Yadkin River in Cabarrus County. The Site is located within the South Prong West Branch Rocky River Watershed, one of the fastest growing regions in North Carolina. According to the Draft Rocky River Watershed Management Plan (Mecklenburg County Storm Water Services 2010), the construction of the 1-77 corridor through this region resulted in a significant increase in land development activities with South Prong of the Rocky River experiencing the biggest increase in growth. The Rocky River and its tributaries have been listed on the 2014 303(d) list for copper, turbidity, and impaired biological integrity (EPA 2014). In addition to these parameters, a Total Maximum Daily Load (TMDL) for fecal coliform was added to the list of water quality concerns with this upper watershed. Portions of the South Prong Rocky River have been straightened and dredged, likely for flood control. Channel straightening, significant channel incision and excessive sedimentation from stormwater runoff are evident throughout the entire watershed. The upper watershed surrounding the Site has seen substantial land use change from agriculture to residential and municipal development over the past five years. Land use changes, excessive stormwater inputs, and physical changes to surface waters in the watershed have caused degradation in water quality through excess sedimentation. Mecklenburg County Storm Water Services (MCSWS) has outlined a watershed plan (2010) highlighting current efforts to improve water quality through stream and wetland restoration and stormwater improvements. MCSWS has prioritized parcels and streams for restoration in which the South Prong West Branch of the Rocky River is included. Because of the position of South Prong West Branch of the Rocky River in the upper headwaters, restoration of this system along with the first order tributaries can produce significant improvements in downstream water quality. Page 6 4 Upper Rocky Mitigation Bank Prospectus 3.1.2 Historic Land Use and Development Trends in Project Watershed A historical aerial review from 1948 to present (Appendix B) was conducted to assess landscape changes in the South Prong West Branch of the Rocky River watershed. Prior to the development of the Bailey's Glen Community and William Hough High School (within the past 5 years), the land within this watershed was primarily forested but heavily utilized for agriculture since the early 1900's. A review of historic aerials indicates that from 1948 through 1983, the watershed experienced few land use changes, with the exception of possibly less land being utilized for row crop and/or pasture. In the 1948 aerial, there appeared to be a substantial forested buffer surrounding the majority of the South Prong West Branch of the Rocky River. By 1965, much of the forested buffer around South Prong West Branch of the Rocky River appears to have been modified through timbering activities, but still remained largely development free. In discussions with the current landowners along the south side of the South Prong West Branch of the Rocky River, these properties were utilized for various agricultural and silvicultural uses, including timber production, cattle grazing, and row crop production. The entire watershed remained almost entirely void of impervious surfaces until approximately 2003. Between 2003 and 2008, development projects including Bailey Middle School and a local town park were constructed along Bailey Road. Starting in 2009 and continuing to date, the three largest impervious projects were constructed, which included William Hough High School, Bailey's Glen Residential Development, and the upcoming Beverly Development. The combination of these projects changed the upper watershed impervious coverage from less than 2 percent to approximately 20 percent. It is anticipated that similar development projects will eventually occur on the remaining undeveloped proportions as Mecklenburg County continues to grow, having a continued impact on the watershed and further supporting the need for the proposed Site. 3.1.3 Catchment Areas The evolution of the land use within the South Prong West Branch of the Rocky River watershed from a combination of forested and agricultural to the present day medium -density combination of residential and municipal has altered watershed characteristics. Figure 2 illustrates the watershed delineation, dividing the watershed into 7 catchment areas based on reach designation. To date it does not appear that that majority of the catchment areas have been significantly disturbed as Catchments 4, 5, 6, and 7 still remain largely undeveloped. Catchments 1 and 3 have been significantly altered while Catchment 2 and portions of Catchment 4 are currently being developed. In addition, because the watershed still consists of large land tracts that will at some point be developed, the watershed hydrology changes will continue. Watershed hydrology, and specifically infiltration patterns, play a critical role in influencing the physical characteristics and ecological health of stream ecosystems. Stream flow magnitude, frequency, duration, and timing are major driving forces that control the physical and ecological conditions of stream corridors. At the downstream easement boundary of the Bank Site, the South Prong West Branch of the Rocky River currently receives flow from an area of approximately 856 acres (1.34 sq. miles). Table 2 shows total area of the catchments and total approximate impervious area for the entire watershed. Currently, the total impervious surface area within the South Prong West Branch of the Rocky River watershed is approximately 20 percent. Five catchment areas have little to no impervious surface area, while the remaining two catchment areas contain dense residential development and impervious areas ranging from 29 to 56 percent. Water & Land Solutions Page 7 Upper Rocky Mitigation Bank Prospectus Table 2. Subwatersheds 3.2 Existing Condition of Streams 3.2.1 Existing Channel Geomorphic Characterization WLS staff conducted a rapid geomorphic assessment of the South Prong West Branch of the Rocky River watershed to assess all streams and wetlands within the project reach. This assessment was focused on channel erosion, stream stability, and the impact of past and current land use practices on the Site's natural resources. Jurisdictional stream criteria were evaluated according to the North Carolina Stream Classification Method (NCSAM), Version 4.11 (2010). Field observations for stream assessments included sediment supply and transport, channel boundary material properties (bed and bank), vegetation characteristics, evidence of excessive channel erosion, and overall channel stability. Where excessive erosion occurred, observations noted the mechanism of failure, whether the instability was localized or reach -wide, and if the failure was recently active or historical. Table 3 provides reach designations, stream length, approximate drainage area, and general descriptions. Page 8 4 North side of Rocky River has extensive impervious coverage (high school) 155.2 39% R1 currently being treated by existing stormwater BMP's. South side of Rocky River is currently being developed. Has been mostly timbered in preparation of residential development, no current 61.8 7% R2 impervious coverage aside from Bailey Road. Highly impacted subwatershed due to high 206.0 56% R3 density residential development. Minimal stormwater detention. Mostly forested, no current impervious 62.0 <1% R4 coverage aside from a single family home. R5 (R5a & Mix of forested and agricultural conditions 113.0 <1% R5b) (row crop), no current impervious coverage aside from 2 single family homes. R6 (R6a & No current impervious coverage. Timber 101.3 <1% R6b), R7, and agricultural activity has dominated this R8 upper watershed for nearly a century. Mix of forested and timbered conditions, 48.3 <1% R9 no current impervious coverage aside from a single family home. Highly impacted subwatershed due to 37.2 49% R10 medium density residential development. Minimal stormwater detention. 856.1 20% 3.2 Existing Condition of Streams 3.2.1 Existing Channel Geomorphic Characterization WLS staff conducted a rapid geomorphic assessment of the South Prong West Branch of the Rocky River watershed to assess all streams and wetlands within the project reach. This assessment was focused on channel erosion, stream stability, and the impact of past and current land use practices on the Site's natural resources. Jurisdictional stream criteria were evaluated according to the North Carolina Stream Classification Method (NCSAM), Version 4.11 (2010). Field observations for stream assessments included sediment supply and transport, channel boundary material properties (bed and bank), vegetation characteristics, evidence of excessive channel erosion, and overall channel stability. Where excessive erosion occurred, observations noted the mechanism of failure, whether the instability was localized or reach -wide, and if the failure was recently active or historical. Table 3 provides reach designations, stream length, approximate drainage area, and general descriptions. Page 8 4 Upper Rocky Mitigation Bank Prospectus Table 3. Reach Descriptions 835 2 Single -thread wetland complex, no impairment 800 8 Severe incision, straightened 129 37 Severe incision Water & Land Solutions Page 9 Severe incision, actively eroding banks, 1,846 794 straightened Moderate incision, actively eroding banks, 711 62 sedimentation from upstream development, lack of vegetated buffers Severe incision, actively eroding banks, 1,369 206 straightened Collapsed culvert, severe incision, straightened, 614 62 spoil piles present on banks Moderately incised to severely incised, active 3,614 220 head cuts, severe sedimentation Moderate incision to low incision, upstream portion (above headcut) shows little to no 1,015 102 impairment, below active headcuts begins moderate incision 1,176 102 Braided, wetland complex, no impairment 835 2 Single -thread wetland complex, no impairment 800 8 Severe incision, straightened 129 37 Severe incision Water & Land Solutions Page 9 Upper Rocky Mitigation Bank Prospectus 3.2.2 Reach Conditions of Proposed Site Streams 3.2.2.1 Reach R1 Reach R1 (R1) is designated as the lower reach of the South Prong West Branch of the Rocky River at the terminus of the Site, starting immediately upstream of the Bailey Road bridge crossing (approximately 1,846 linear feet). Cross Section 1 was recorded for R1. R1 has a total drainage area of 794 acres with a total watershed impervious coverage of 29 percent. This reach is highly unstable and incised and appears to have been straightened and possibly dredged at some point in the past. Because of land use activities (agricultural), it is possible the stream was relocated closer to the northern edge of the valley. Stream banks are highly unstable and in -stream habitat is under constant duress due to upstream bank erosion. The channel banks are highly incised with bank heights of up to 12 feet, totally removing floodplain access. Based on NCSAM, this stream system is classified as low and is therefore considered to be low quality. 3.2.2.2 Reach R2 Reach R2 (R2) is a tributary to the South Prong West Branch of the Rocky River flowing to the northwest and originating southeast of Bailey Road (immediately upstream and offsite). The stream maintains an existing length of 711 linear feet within the Site's easement boundaries. This perennial tributary was in relatively stable condition prior to land use changes within the past year. However, with the construction along Bailey Road and clearing for future development in the upper watershed of this tributary, the stream within the Site's easement limits has been impacted by sedimentation and most recently in -stream bank erosion. Some vegetation clearing along the stream banks for the future crossing into the Beverly subdivision has removed trees that had historically provided bank stability. R2 contains Cross Section 2 and has a total catchment of 62 acres with a total watershed impervious coverage of 7 percent. However, watershed conditions are changing rapidly for this channel which will lead to continued bank failure, incision, ana namtat loss. tsasea on N SHivi, tnis stream system is classified as low and is therefore considered to be low quality. Page 10 4 3.2.2.3 Reach R3 The South Prong West Branch of the Rocky River splits into three primary channels as the stream complex transitions upstream. Reach R3 (113) is the northernmost channel which flows close to the northern boundary of the Site conservation easement and eventually upstream into the Bailey's Glen Residential Community. This channel was historically relocated to the outer edge, and is slightly upslope of its natural valley. Within the Site limits, this reach is approximately 1,369 linear feet and has a drainage area of approximately 206 acres. This channel currently has three significant headcuts that continue to move upstream and have caused significant sedimentation downstream. While this reach is flanked by a mature hardwood buffer, the current headcuts and substantial incision create a detachment between the streamflow and relic floodplain. Stream banks are highly unstable and in -stream habitat is mostly nonexistent. Cross Sections 3, 4, and 5 were collected for R3 to accurately depict the presence and impacts of these 3 headcuts. Based on NCSAM, this stream system is classified as low and is therefore considered to be low quality. Upper Rocky Mitigation Bank Prospectus 3.2.2.4 Reach R4 Reach R4 (R4) is a tributary to the South Prong West Branch of the Rocky River flowing from the south and continuing upstream off of the Site property. Within the Site property, this stream was historically straightened and dredged, likely for farming and/or flood control purposes. Bank height ratios are extremely high indicating a very unhealthy system. R4 has an existing culvert crossing for a relic driveway (soil road). Upstream (outside the Site limits) of this culvert the stream remains in stable condition and was not historically straightened or dredged. Downstream of this culvert, and within the Site limits, the stream exhibits significant incision, nearly complete habitat loss, and excessive bank erosion. The floodplain maintains a hardwood buffer but the stream cannot access its relic floodplain except during extreme precipitation conditions. The approximate length of R4 within the Site property is 614 linear feet and the drainage area is approximately 62 acres. Cross Section 8 was taken downstream of the culvert crossing in the Water & Land Solutions Page 11 Upper Rocky Mitigation Bank Prospectus highly incised and unstable section while Cross Section 9 was taken upstream of the culvert where the channel maintains its stability. The upstream portion of R4 maintains a relatively stable dimension, pattern, and profile and will provide a reference reach for design on the portion of R4 that will be restored. When scored based on NCSAM, the lower reach of this stream system was classified as low quality. 3.2.2.5 Reach R5 (including R5A & R5B) Reach R5 (R5) is the southernmost branch of the South Prong West Branch of the Rocky River and originates from the confluence of two intermittent channels within a relatively undeveloped drainage area. The Site stream length for this reach is approximately 3,614 linear feet and the drainage area is approximately 220 acres. R5 included a primary channel and three small tributaries. As this reach transitions into the confluence valley where it connects with the two other Upper Rocky River branches, the channel has been pushed against the edge of the valley and straightened, maintaining a ditch -like dimension, pattern, and profile. Excessive sedimentation from upstream erosion has settled out in this portion of the reach and the channel maintains a uniform and unnatural habitat condition (no riffle/pool complex). As reaches transition upstream and away from the deposition in the valley containing the confluence, the channel exhibits significant incision, overall habitat loss, and excessive bank erosion. The channel does appear to be within its natural valley and historic pattern, but the incision is significant enough that the channel likely does not access its floodplain except during extreme precipitation conditions. While some short sections of this reach indicate a building bankfull bench, because of the incision these short sections are overwhelmed during storm events and a consistent dimension and profile are unattainable without restoration. The channel contains multiple headcuts indicating a constant presence of instability. Cross Section 11 was recorded along R5 and verifies high bank height ratios as well as sever incision. Based on NCSAM, this stream system is classified as low quality. Page 12 4 3.2.2.6 Reach R6 (including R6A & R6B) Reach R6 (R6) is the central branch of the South Prong West Branch of the Rocky River. R6 represents the transition between the upstream braided multi -thread R7 (described below) and the highly incised downstream R1. Because of significant modifications to this valley for historic agricultural practices, it is relatively difficult to discern where the historical location of this channel should be. A series of small disconnected ditches, sediment depositional areas, and other areas of stormflow during large precipitation events indicate a consistently changing and unstable valley. R6 has a series of headcuts that have moved upstream from R1 and R5. Cross Sections 10, 12, and 13 were recorded to capture the varying degrees of incision and headcut transition throughout this reach. The stream length of R6 within our Site area is approximately 1,015 linear feet while the drainage area encompasses approximately 102 acres. Upper Rocky Mitigation Bank Prospectus Some portions of R6 located above the series of headcuts maintain what appears to be stable dimension, pattern, and profile and have access to the floodplain during precipitation events. The areas of R6 that are not incised also contain the presence of adjacent wetlands, providing a snap shot of what this watershed looked like prior to stream modification. The forested buffer is relatively young and is dominated by more successional species indicating past timber and agricultural activities. When the stream is classified overall based on NCSAM, this stream system is classified as low and is therefore considered to be low quality. Water & Land Solutions Page 13 Upper Rocky Mitigation Bank Prospectus 3.2.2.7 Reach R8 Reach R8 (R8) is immediately upstream of R7 and continues as the central branch of the South Prong West Branch of the Rocky River. R8 is the same stream system as R7, but is distinctly different in that it represents the transition upstream and out of the stable multi -thread braided stream and wetland complex. The valley slope surrounding R8 appears to be slightly steeper and more typical of the Piedmont than R7. Beaver activity continues to be active within R8 but because of the change in valley conditions the beaver dams have less impact on the adjacent floodplain. Stream conditions within R8 are similar to open water systems (ponding). The stream remains incised and does not maintain a riffle/pool complex because of ponding. Sedimentation from upstream bank erosion gets stored in R8 and water quality conditions are not indicative of a perennial Piedmont stream. Stream length of R8 within the Site limits is approximately 835 linear feet and an upstream catchment acre of approximately 82 acres. Based on NCSAM, this stream system is classified as high and is considered to be high quality. Page 14 4 3.2.2.8 Reach R9 Reach R9 (R9) is a tributary to the central branch of the South Prong West Branch of the Rocky River flowing from the south. Within the Site property, this stream likely was historically straightened and dredged. This reach is severely incised and exhibits bank erosion and instability. The Site stream length for this reach is approximately 800 linear feet and the drainage area is approximately 48 acres. Excessive sedimentation from bank erosion has settled into riffles and pools creating a uniform and unnatural habitat condition. The channel does appear to be within its natural valley and historic pattern, but the incision is significant enough that the channel does not access its floodplain except during extreme precipitation conditions. Cross Section 14 was recorded along R9. Based on NCSAM, this stream system is classified as low and is considered to be low quality. 3.2.2.9 Reach R10 Reach R10 (R10) is a short tributary to the South Prong West Branch of the Rocky River (R1) flowing from the north along the west side of William Hough High School. The valley for R10 is moderately defined but the channel appears to have a head cut from R1 moving upstream off of the Site property due to the incised condition of R1. This reach is severely incised and exhibits bank erosion and instability. The Site's stream length for this reach is approximately 129 linear feet and the drainage area is approximately 37 acres. It is unclear if this reach had formed a perennial stream Upper Rocky Mitigation Bank Prospectus prior to headcutting from R1. The channel does appear to be within its natural valley and historic pattern, but the incision is significant enough that the channel cannot access its floodplain except during extreme precipitation conditions. Cross Section 15 was recorded along R10. 3.3 Existing Condition of Wetlands The historical presence of wetlands in Piedmont North Carolina, specifically within the Mecklenburg County region, was largely concentrated within headwater stream valleys that had sufficiently sized watersheds, high clay content in soils, and smaller streams that maintained relatively frequent overbank flooding. These riparian wetland systems were dependent upon these specific conditions in order to Water & Land Solutions Page 15 Upper Rocky Mitigation Bank Prospectus maintain consistent hydrology that defines jurisdictional wetlands. As agricultural practices spread throughout this region in the early to mid -1900's, streams were straightened, dredged, and/or relocated in order to maximize agricultural production. These historically wet valleys provided ideal settings for high crop yield and cattle production because of access to groundwater. Stream modifications and subsequent drainage of the floodplain provided the greatest factor for the general loss of Piedmont riparian wetlands during this time period. As the urban growth of Charlotte increased and the suburban growth followed, these already impacted systems underwent additional major watershed hydrologic changes including increased stormflow velocities and quantities (associated with an increase in impervious surface) which led to increased downcutting of streams. The urban/suburban growth mixed with the historical agricultural practices led to a significant loss of Piedmont wetlands in the Mecklenburg County Region. The Site represents this combination of conditions due to the agricultural land use practices during the last century, and now suburban growth occurring within the watershed. The combination of the three major stream reaches coming together at their confluence within a low slope valley, which also contains a high clay content, can lead to the conclusion that it is highly likely that the entire valley maintained wetland conditions prior to agricultural land use activities. In the few areas of the Site where streams are not incised, wetland pockets are abundant. In the areas downstream of current and active headcuts where streams have been actively draining floodplain soils, wetland vegetation indicators are present but the lack of hydrology has led to a significant loss of wetland functions. The entire Site valley was mapped by a licensed soil scientist as Monocan Soils, one of only two soils mapped in Mecklenburg County that maintain riparian wetlands. Based on the combination of high clay content soils, abundant surface water, and the presence of wetlands where stream incision isn't present, it appears as if the majority of the valley should maintain jurisdictional wetlands. A full soils investigation has been conducted by a licensed soil scientist and results are pending. On-site wetlands were identified using the three -parameter approach prescribed in the 1987 Corps of Engineers Wetlands Delineation Manual. Jurisdictional wetlands were also evaluated according to the North Carolina Wetland Assessment Method (NCWAM), version 4.1 (2010). Based on our assessment of the on-site water features, there are six wetland systems identified within the Site boundaries (Figure 6). A total of approximately 282,000 square feet (6.5 acres) of wetlands were delineated using pink and black striped and blue sequentially numbered flagging. The first wetland system W1 (Figure 6) is the most upstream wetland within the Site property and is located along R8. This system is dominated by a series of larger active beaver dams that appear to be actively expanded and maintained by the current beaver population. Vegetation within this system is dominated by more upland and floodplain species not typically found within wetlands. Vegetation mortality within this wetland appears high as more upland species adjust to the rising water surface elevation due to the beaver activity. This system functions more like an open water pond and is not Page 16 4 Upper Rocky Mitigation Bank Prospectus expected to maintain significant wetland conditions once the restoration of the valley and stream occurs (including beaver removal). Based on NCWAM, this wetland system is classified as low quality. The second and most dominant jurisdictional wetland system, W2(Figure 6) is the largest wetland identified within the Site property and is located along R7 (multi -thread stream and wetland complex). This system is located immediately downstream of W1 and is differentiated by the lack of active beaver, vegetation composition, saturation pattern, and valley slope conditions. This system is dominated by a series of small relic beaver dams that have naturalized over the past approximately 50 years. While beavers are currently active upstream of this system, it does not appear that beavers actively build or maintain within this wetland area based on site conditions. This wetland is located within an area of relatively low valley slope as compared to typical Piedmont stream valleys, likely due to historic deposition from upstream bank erosion. The valley has been mapped as Monacan Soils. The low slope valley condition, presence of historic beaver activity, mapped hydric soils, and stable streams (no headcuts present) allow this wetland to maintain a very consistent and strong presence. Vegetation within this system is dominated by herbaceous and shrubs including Juncus effusus, Carex spp, and Scirpus sp. This wetland maintains saturation throughout the year and provides significant water quality benefits. This system is surrounded on both sides by a relatively steep terrain. Based on NCWAM, this wetland system is classified as low quality; however the low rating was likely due to the historic impact of beavers as the wetland system is currently considered a high quality functioning system. The third wetland system, W3(Figure 6) is directly downstream and connected to W2. However, this system is significantly different than W2 because of multiple factors. W3 is located in the confluence valley where all three of the major Upper Rocky River tributaries join, creating a valley that likely remains saturated during and immediately following precipitation events under stable conditions. W3 wetland boundaries were delineated above the active stream headcuts where this consistent soil saturation occurs. This system is forested and functions like a bottomland hardwood forest. Based on NCWAM, this wetland system is classified as high and is considered to be a high quality wetland system. The northeastern wetland boundary (downstream wetland edge) coincides with the headcut locations along the three tributaries, indicating the impact of wetland hydrology loss relative to stream incision. As stream base flow lowers due to stream incision, the groundwater elevation is directly lowered and therefore wetland hydrology is not present long enough during the growing season to maintain wetland conditions. Soil conditions and vegetation conditions remain consistent throughout the entire downstream valley. It should be noted that as the stream incision gets deeper and groundwater elevations lower in response, the presence and density of Chinese Privet (Ligustrum sinense) significantly increases, becoming the dominant species within this community, which is common of drained floodplains in the Piedmont. The fourth wetland system, W4 (Figure 6) pocket is located downstream of the confluence valley along the outer edge of the R1 floodplain. This small wetland pocket represents a snap shot of what the floodplain edge of the South Prong West Branch of the Rocky River likely contained prior to significant land use changes over the past century. The majority of the floodplain of the South Prong West Branch of the Rocky River has been drained by straightening, dredging, and headcutting of on-site streams. In addition to these activities, a lateral ditch was dug along the toe of slope of the floodplain to drain what was likely wetland conditions. W4 represents the only area outside the effectively drained portions of the floodplain (by this ditch/stream network). This small wetland pocket is classified as a riparian toe -of -slope wetland and historic hydrology is directly linked to base flow conditions within the South Prong West Water & Land Solutions Page 17 Upper Rocky Mitigation Bank Prospectus Branch of the Rocky River, as well as rising groundwater where the natural site valley slopes meet the floodplain. This system is forested and functions like a bottomland hardwood wetland. Based on NCWAM, this wetland system is classified as medium quality. While this system functions as a high-quality wetland, the loss of overbank and overland flooding from incised streams within the floodplain doesn't allow this wetland to meet its maximum NCWAM value. The fifth wetland system, W5 (Figure 6) is located upstream of the confluence valley along R5. This wetland system is a combination of wetland pockets that maintain very similar conditions to W3 and W4. These wetland pockets are riparian wetlands along the toe of the valley slope and are directly linked to base flow conditions within the stream. The majority of R5 is severely incised and unstable. Where this incision occurs, the floodplain and historic riparian wetlands have been drained. However, a small section of R5 remains in stable condition due to a significant root structure that has allowed the stream headcut to be avoided. The riparian wetland pockets associated with W5 are adjacent to this short section of stable stream, further indicating that if the streams are restored to their proper elevation, wetland pockets are anticipated to form throughout the floodplain. This system is forested and functions like a bottomland hardwood. Based on NCWAM, this wetland system is classified as high quality. The sixth wetland system, W6 (Figure 6) is located along R5 as this stream enters confluence valley. This wetland system maintains very similar conditions to W3 and W5. This forested riparian wetland is within an area of historic deposition along R5 where sediment from upstream bank erosion has settled out ' creating a backwater effect to some degree. The majority of R5 upstream of this wetland is severely incised and unstable. However, the stream adjacent to W6 maintains a shallow dimension allowing frequent overbank flooding .- ' and wetland hydrology to persist within the floodplain. The riparian W6 provides further evidence that if the streams are restored to their proper elevation, wetland pockets are anticipated to form throughout the floodplain. This system is forested and functions like a bottomland hardwood. Based on NCWAM, this wetland system is classified as high quality, with the only negative factor being sediment flushing that occurs within due to continued upstream bank erosion. 3.4 Potential Site Constraints 3.4.1 Existing Easements on the Site Portions of R3, R5, and R6 are located on property that is managed under a Wildlife Habitat Conservation Agreement. This Agreement did not require recordation of a conservation easement. WLS has coordinated with NC Wildlife Resources Commission to ensure that this land designation is compatible with stream and wetland restoration projects. There are no other existing easements on the Site. Page 18 4 Upper Rocky Mitigation Bank Prospectus 3.4.2 Utility Corridors within the Site The proposed Site contains a sewer right of way that runs parallel to R1 along the northern property boundary. There are three instances where the sewer line will cross the restored R1. These right-of-ways will be excluded from the conservation easement and mitigation credit calculations. The presence of this sewer utility will not negatively impact the proposed project. There are no other existing utility corridors on the site. 3.4.3 Mineral or Water Rights Issues There are no mineral or water rights issues within or adjacent to the Site. 3.4.4 Hydrologic Trespass The downstream portion of R1 is located within a FEMA regulated floodplain. While it is not anticipated that there will be issues associated with FEMA permitting or documentation, WLS will coordinate with the local floodplain administrator as needed and prepare the required documentation to obtain approval for any FEMA regulated impacts. In addition, the project will be designed so that any increase in flooding will be contained within the Site conservation easement boundaries and will not impact adjacent landowners; therefore, hydrologic trespass will not be a concern. 3.4.5 Invasive Species Within the proposed project boundary, there are several areas with a substantial community of the non- native, invasive plant species, predominantly Chinese Privet (Ligustrum sinense). A few additional pockets of additional invasive species vegetation, including Multiflora Rose (Rosa multiflora) occur sporadically within the Site. WLS will develop a comprehensive control and monitoring program, using mechanical and chemical control techniques to control invasive plant species currently on site and to help prevent future proliferation. 3.4.6 Cultural Resources In accordance with the National Historic Preservation Act, WLS investigated and confirmed that the proposed project area and property does not contain nor is it adjacent to any properties listed in the National Register with the State Historic Preservation Office. There are several sites located within approximately one mile of the proposed project area, most of which are survey only and are not registered. The closest such site was the Bailey House, located approximately 0.2 miles north east of the project area. More recent aerial photography shows that this site has been demolished and removed. There are two sites on the National Register that are within the vicinity of the proposed project site. Potts Plantation is a historical farm site located approximately one mile north. The South Prong West Branch of the Rocky River flows through this property, but it is upstream of the confluence with the proposed project and no impacts are expected to this registered property. The historical house Beaver Dam is located approximately 1.1 miles north east of the proposed project area. No impacts to the property will occur due to the Bank Site. Water & Land Solutions Page 19 Upper Rocky Mitigation Bank Prospectus 3.4.7 Threatened and Endangered Species According to the US Fish and Wildlife Service (USFWS), there are four species listed as endangered in Mecklenburg County: Carolina heelsplitter (Lasmigona decorata), smooth coneflower (Echinacea laevigata), Schweinitz's sunflower (Helionthus schweinitzii), and Michaux's sumac (Rhus michauxii). One species, the Northern Long Eared Bat (Myotis septentrionalis) is listed as threatened. The shade -intolerant Michaux's sumac typically occurs in open habitat that is frequently disturbed by mowing or, historically, by fire. The smooth coneflower's habitat is dry limestone bluffs, bare rock/cliff, and disturbed areas where the flower can receive full or partial sunlight. Schweinitz's sunflower also prefers open areas, such as utility right-of-ways, with thin, clayey soils. All of the endangered plant species have similar habitat requirements and there is some appropriate habitat on the Site. All areas of appropriate habitat were carefully inspected, within the pasturelands and along the transition zones between open and forested regions. No individuals of these three species were observed during the field investigation. The Carolina heelsplitter is a relatively large, freshwater mussel endemic to several river drainages in North and South Carolina. The species is reported to inhabit small to large streams and rivers. They are usually found in muddy sand, muddy gravel, or mixed sand and gravel, near stable, well -shaded stream banks. Historically, the range included the Catawba and Pee Dee River Systems in North Carolina. Only two small populations are known to exist in North Carolina and those are located in Union County. The only appropriate habitat on the Site may have been R1 that runs along the northeastern border. This stream has been impacted by historic straightening of the channel with severely eroded, unstable banks. It is highly unlikely that this stream would provide the stable habitat required by this species. As part of due diligence and to avoid violation of the USFWS Northern Long-eared Bat Final 4(d) Ruling, WLS contacted the USFWS to determine if any known hibernacula were located in Mecklenburg County. None are known to exist there. This area is not listed as critical habitat for any listed endangered or threatened species and the proposed Site should not negatively impact any listed species. 3.4.8 Conditions Affecting Hydrology A series of beaver dams exist throughout R7 and R8. Beaver dams will be removed in their entirety during construction and monitoring periods. The removal of beavers is not expected to adversely affect the hydrology of the site. WLS will extensively manage beaver on the project site during the monitoring period. There is a culverted road crossing at the end of the project (Bailey Road crossing). This culvert will remain in place. Therefore, design elevations will tie into this reference point. There are several ditches throughout the Site. These ditches were historically used to drain wetlands and create arable land for farming. These ditches will be plugged during restoration activities to prevent them from negatively affecting hydrology on the completed project. Page 20 4 Upper Rocky Mitigation Bank Prospectus 3.4.9 Adjacent Land Use The Site adjacent land use includes a high school, an established residential community, a developing residential community, and agriculture and forestry. None of these land uses will have negative impacts on the operation of the Site. Water & Land Solutions Page 21 Upper Rocky Mitigation Bank Prospectus 4 Proposed Site Conditions 4.1 Objectives of Proposed Mitigation Site The Site will provide numerous water quality and ecological benefits within the Upper Rocky River Watershed, which ultimately drains to the Yadkin River. The Site is located in the West Branch Rocky River - 03040105010010 Targeted Local Watershed (TLW), which is characterized by increasing development pressures (NCEEP 2009). The placement of the proposed Site will provide significant longterm protection of natural resources and will meet the general restoration and protection goals outlined in the 2009 Lower Yadkin Pee -Dee River Basin Restoration Priorities (RBRP) (NCEEP 2009) and in the Draft Rocky River Watershed Management Plan (MCSWS 2010). The Site will meet these goals by: • Reducing in -stream erosion and sediment/nutrient inputs by rebalancing imposed shear forces and sediment transport capacity with sediment supply • Reestablishing floodplain connectivity of the currently incised channel • Prevent active headcuts from migrating farther upstream • Restoring, preserving and protecting riparian, riverine wetlands • Increasing habitat for benthic macroinvertebrates by incorporating habitat features such as woody materials, pools and backwaters, riffles and structures. The Site stream reaches show the classic signs of habitat degradation associated with the transition of a watershed from an agricultural community to an urban development through hydromodification, severe channel incision, and a loss of wetland habitat. Our goal is to reestablish long-term stability by rebalancing the watershed's geomorphic and hydrologic processes. Through the restoration of on-site streams and associated wetlands, the design will recondition the site to create natural geomorphic processes leading to enhanced habitat quality and greater riparian function. Complementing the restoration effort, the design will also incorporate stormwater treatment to minimize the hydrologic effects of urbanization in the watershed. 4.2 Conceptual Mitigation Plan The Site will involve the potential restoration, preservation and permanent protection of approximately 12,109 linear feet of existing streams. WLS's comprehensive design approach utilizes the entire suite of stream mitigation practices, from Priority Level I Restoration to Preservation, and appropriately addresses all of the intermittent and perennial stream reaches at the project site, including protecting or enhancing riparian buffers along all of the project stream reaches, and limiting the number of stream crossings, thus providing the maximum functional uplift and utilizing a true watershed approach. The proposed Site will provide adequate floodplain access to all stream reaches. For any stream reach along which Priority Level II Restoration must be utilized, the following elements will be incorporated into the proposed design and construction: • Floodplain bench excavation grading will extend a minimum of 1.5 bankfull widths beyond the stream belt width such that meandering floodplains are not created. • All proposed floodplains will be constructed such that they are over -excavated to accommodate replacement of topsoil. Page 22 4 Upper Rocky Mitigation Bank Prospectus • Design and construction oversight measures will ensure the proper harvesting, segregating, stockpiling, storage, handling, overall management and replacement of A and B soil horizon materials onto the excavated floodplain. WLS has compiled and assessed watershed information including drainage areas, historic and current land uses and development trends, geologic setting and landscape controls, soil types, and terrestrial plant communities. WLS will compare the results of the existing conditions analyses along with reference data from previous project implementation to determine the degrees of impairment and functional losses as they relate to physical and biological processes, as well as aquatic resources. In order to develop an appropriate design approach for the project reaches, the restoration potential must be determined to maximize the highest functional uplift based on the hydrology, hydraulics, geomorphology, physiochemical, and biological hierarchy. The design will utilize hybrid stream restoration approaches that have been successfully implemented on past projects. This includes using process based analytical tools when appropriate, as well as Rosgen's methodology, under which dimensionless ratios from reference reach data (analog) and past project experience (empirical) are analyzed in order to develop design criteria. The proposed project will provide increased floodplain access throughout the project area for all restoration reaches and will be monitored to demonstrate successful floodplain function. The stream channel design will include analysis of the hydrology, hydraulics, shear stress, sediment transport, and bankfull channel dimensions. WLS will consider three methods (field indicators if present, published regional curve information, and hydraulic modeling) for estimating bankfull discharge. The hydrology and hydraulics analysis will evaluate a range of significant flow discharges and flood frequency curves to help determine an appropriate bankfull discharge. The bankfull discharge will be used to select an appropriate channel geometry and help monitor long-term performance. Sediment transport calculations and stream power analyses will be performed for both the existing degraded channels and the proposed design channels. WLS will assess the stream's transport competency and capacity in order to quantify the stream's ability to move its sediment load. Small alluvial channels in the Piedmont may have a relatively low sediment supply (i.e., first order streams) with fine grained material, and therefore complex sediment transport calculations or models may not be necessary. However, it is still critically important to perform watershed reconnaissance and estimate how much sediment is being supplied to the project reaches by determining load rates from both within the channel (bed/banks) and upland sources. WLS will perform quantitative channel assessments that include pebble counts, collecting sediment samples (pavement/sub-pavement, bar), and predicting streambank erosion rates using the BANCS Method (BEHI/NBS) in order to evaluate bed and bank material characteristics and estimate sediment yields. The bed material will be sieved and a grain size distribution developed. The results of the substrate analyses will be used to classify the streams, and complete critical shear stress calculations required for designing slopes/depths and predicting channel stability. Other observation methods, such as dendro- geomorphic studies (bank root mass), bank pins/profiles, cross section surveys, and time -series aerial photography may also be used as a comparative analysis. Water & Land Solutions Page 23 Upper Rocky Mitigation Bank Prospectus Additionally, WLS will calculate stream power and compare the results to stable reference and published values to reduce uncertainties. If the results fall outside common stable ranges for similar stream types and slopes, multiple design iterations and methods, such as the Copeland Stability Curve, HEC -RAS -SAM modeling program, will be run to confirm that sediment loads can be transported adequately through the system without containing excess energy in the channel and verify that the design will not excessively aggrade or degrade. In -stream structures will be utilized for grade control, streambank protection, and improving bedform diversity and habitat. All in -stream structures will be constructed from materials naturally found at the project site such as hardwood trees, trunks/logs, brush/branches, gravel, stone, and small boulder materials. Rock used for structures has been harvested on-site from the adjacent development. In order to ensure sustainability of those structures, WLS will use methods of structure design and construction that have proven successful on numerous past projects in the same geographic region. WLS may also incorporate bioengineering practices, when appropriate, that use biodegradable materials and fabrics, uncompacted soils, live plant cuttings, and native vegetation to stabilize streambanks. Bioengineering treatments will provide initial bank stability that allows for the quick establishment of deep-rooted vegetation along the eroding streambanks. Once established, these live, dormant plant cuttings will provide long-term stability to the treated areas. WLS has field verified that the project site has adequate, viable construction access, staging, and stockpile areas. Note that physical constraints or barriers, such as stream crossings, account for less than three percent of the proposed total project footage within the conservation easement area. These same existing site access points and features will be used for future access after the completion of construction. Where practicable, impacts to existing native riparian buffer vegetation will be minimized. The use of native species riparian buffer vegetation transplants will be maximized as well. Any potential impacts to existing wetland areas will be avoided during construction, with only temporary, minimal impacts expected only as necessary for maximized permanent stream, wetland, and riparian buffer functional uplift. 4.3 Alternative Outcome without Bank Without the proposed mitigation Site, it is expected that the watershed will continue to increase in impervious areas and will undergo further urbanization and development. The Bjorneboe parcels will most likely be logged and subdivided. The Mayes property is well suited for development, as well. The Beverly property will potentially continue to degrade due to its current state of incision. Due to the current stream conditions (incised and unhealthy), the existing and future watershed modifications will likely exacerbate on-site stream and wetland degradation further impacting on-site and downstream water quality. The placement of the Bank Site and restoration of on-site wetlands and streams is likely the only solution to providing significant water quality benefits. 4.4 Reference Ecosystems Reference ecosystems will be identified that represent similar conditions to the restored stream and wetland system. Reference wetlands exist on-site where preservation is proposed. Reference streams exist upstream of R4. Additional reference reaches will be identified by the designer before design begins. Page 24 4 Upper Rocky Mitigation Bank Prospectus 5 Bank Establishment and Operation The URMB will be established as an umbrella mitigation bank. The compensatory credits will be available to public, private, and non-profit customers. The proposed Site will include a combination of Stream Restoration, Enhancement Level I, and Preservation activities, as well as Riparian Wetland Restoration, Enhancement, and Preservation activities, depending upon the need of the individual reach and/or wetland area, and the highest ecological lift possible. The 8 -digit HUC is rapidly developing, so we anticipate a consistent need for both stream and wetland mitigation credits. In addition, the City of Charlotte Umbrella Mitigation Bank is lacking wetland mitigation credits. Therefore, any credits generated by URMB may be available to the City as well. 5.1 Proposed Credit Types Expected credit types are Stream Mitigation Credits (SMCs) and Wetland Mitigation Credits (WMCs). Warm water stream mitigation credits will be generated through Restoration, Enhancement Level I, and Preservation activities (Table 4). Riparian, riverine wetlands mitigation credits will be generated through Restoration (both Re-establishment and Rehabilitation), Enhancement, and Preservation activities (Table 5). Table 4. Proposed Stream Mitigation Credits (SMCs) 1,846 Restoration (1:1) 0.85 1,846 711 Restoration (1:1) dM. 7114 1,369 Restoration (1:1) ■I 1,369 614 Restoration (1:1) -L 614 3,110 Restoration (1:1) JF 3,110 258 Enhancement 1 (2:1) ' 129 246 Enhancement 1 (2:1) 123 723 Restoration (1:1) 723 160 Restoration (1:1) 160 132 Enhancement 1 (2:1) 66 1,176 Preservation (5:1) 235 835 Enhancement 1 (2:1) 417.5 800 Restoration (1:1) 800 129 Enhancement 1 (2:1) 64.5 10,368 Table 5. Proposed Wetland Mitigation Credits (WMCs) 1.70 Enhancement (2:1) 0.85 3.10 Enhancement (2:1) 1.55 1.15 Preservation (5:1) 0.23 0.05 Preservation (5:1) 0.01 0.20 Rehabilitation (1.5:1) 0.13 0.30 Preservation (5:1) 0.06 9.60 Re-establishment (1:1) 9.60 12.43 Water & Land Solutions Page 25 Upper Rocky Mitigation Bank Prospectus 5.2 Credit Release Schedule All credit releases, except the initial release, will be based on the total number of mitigation credits generated as reported by the as -built survey. The initial credit release will be based on the proposed restoration lengths (SMCs) and acreages (WMCs). The credit ledger will be managed by WLS and approved by the District. The estimated credits will be released following District guidance, as shown in Table 6 below. For streams, 10% of credits will be withheld until four (4) bankfull events, in separate monitoring years, have been documented. Site establishment shall include: approval of umbrella mitigation banking instrument, approval of final mitigation plan, securing the Bank Site, financial assurances delivery, long- term protection mechanism delivery, title opinion delivery, and issuance of any permits necessary for construction. Table 6. Credit Release Schedule Site Establishment (as defined above) 15% 15% 15% 15% Completion of all initial physical and biological improvements made pursuant 15% 30% 15% 30% to the Mitigation Plan Year 1 Monitoring Report demonstrates that channels are stable and interim 10% 40% 10% 40% performance standards have been met Year 2 Monitoring Report demonstrates that channels are stable and interim 10% 50% 10% 50% performance standards have been met Year 3 Monitoring Report demonstrates that channels are stable and interim 10% 60% 15% 65% performance standards have been met Year 4 Monitoring Report demonstrates 65% that channels are stable and interim 5% 5% 70% (75%) performance standards have been met Year 5 Monitoring Report demonstrates that channels are stable and interim 10% 75% 15% 85% (85%) performance standards have been met Year 6 Monitoring Report demonstrates that channels are stable and interim 5% 80% 5% 90% (90%) performance standards have been met Year 7 Monitoring Report demonstrates that channels are stable and interim 10% 90% 10% 100% (100%) performance standards have been met 5.3 Service Area The Bank will provide compensatory mitigation credits for permitted impacts to Waters of the United States in the Yadkin River Watershed, HUC 03040105. This particular Bank Site is further characterized by Page 26 4 Upper Rocky Mitigation Bank Prospectus the 14 -digit HUC 03040105010010, which is managed under the Upper Rocky River and Clarke Creek Local Watershed Plan (LWP). It is also located within a NC Targeted Local Watershed (TLW). The Rocky River Watershed has experienced drastic increases in urbanization over the last 10 to15 years. Many stream systems have been straightened as a result of this growth, along with the extensive agricultural practices that dominated the area previously. Like other developing watersheds, higher loads of nutrients, metals, and sediment are more typically found here than in stable watersheds. A 2004 NCEEP planning initiative study identified much of the watershed as having potential for excessive erosion, based on soil types, imperviousness and other factors (NCEEP 2004). The Rocky River and its tributaries is listed as impaired on the 2014 303(d) list for ecological/biological integrity, mercury in fish tissue, copper, turbidity, and zinc. The Rocky River is also governed by a TMDL for fecal coliform (EPA 2014). MCSWS composed a draft watershed management plan in 2010. This watershed management plan divided the watershed in 13 sub -basins to compare and locate priority areas. Using upland land use characterization to compare the sub -basins, the proposed Site basin ranks second in fecal coliform, second in total nitrogen, second in total phosphorus, sixth in TSS, third in copper, second in imperviousness, and sixth in buffer impacts (CMSWS 2010). The report assessed 37 individual reaches within the watershed using BEHI, Near Bank Stress (NBS), Simon's Channel Evolution Model, and Rapid Bioassessment Protocol Forms. The main tributaries of the Upper Rocky River Mitigation Site were three of the studied reaches. These reaches were recommended for restoration and enhancement (1). The sub -basins were again compared using the results of these studies. The Site basin, upstream/headwaters of the South Prong, West Branch of the Rocky River, was consistently rated in the worst condition, and as such, is listed as a Priority Basin. The Site basin is a priority due in part to the presence of significant institutional land use and high density residential development; the basin was ranked as having the highest average erosion rate per reach, and the worst basin -wide degradation (CMSWS 2010). 5.4 Proposed Financial Assurances Financial assurances will be in the form of casualty insurance. WLS has begun the process of securing coverage for the Site. Details will be finalized prior to completion of the Mitigation Plan. The insurance policy will be submitted for review and approval by Office of Counsel. The Corps will hold the original policy document. 5.5 Long -Term Management The Site will be protected in perpetuity by conservation easements that extend at least 50 feet from the top of bank (edge of channel) and encompass all wetland areas. The responsible party for long-term management has not yet been chosen, but will be secured prior to publishing the Mitigation Plan. Financial assurances for long-term management will be approved by the IRT prior to the commencement of any Bank establishment activities. Water & Land Solutions Page 27 Upper Rocky Mitigation Bank Prospectus 6 Citations Environmental Protection Agency (EPA), 2014. "Impaired Waters, TMDL Pollutant: Fecal Coliform, TMDL ID: 4301." Accessed via: https:Hiaspub.epa.gov/watersl0/attains_impaired_waters.control?p_tmdl_id=4301&p_tribe=& p_pollutant_id=500&p_report_type= Mecklenburg County Storm Water Services (MCSWS), 2010. "Rocky River Watershed Management Plan." Draft version obtained from Mecklenburg County Storm Water Services direct contact. North Carolina Ecosystem Enhancement Program (NCEEP), 2004. "Upper Rocky River/Clarke Creek Local Watershed Plan." Accessed via: http://www.nceep.net/services/lwps/Clarke_Creek/introduction.html NCEEP, 2009. "Lower Yadkin Pee -Dee River Basin Restoration Priorities 2009." Accessed via: https:Hncdenr.s3.amazonaws.com/s3fs- public/Mitigation%20Services/PublicFolder/Work%20With/Watershed%20PIanners/Yadkin_Pee _Dee_RBRP_2009_Final.pdf NC Stream Functional Assessment Team, 2015. "NC Stream Assessment Method (NCSAM) User Manual". Version 2.1, August 2015. NC Wetland Functional Assessment Team, 2010. "NC Wetland Assessment Method (NCWAM) User Manual". Version 4.1, October 2010. Page 28 4 Appendix A -Figures Upper Rocky Mitigation Bank Prospectus Appendix A - Figures Figure1.........................................................................................................................Project Location Map Figure2....................................................................................................................... Catchment Areas Map Figure3..................................................................................................................... USGS Topographic Map Figure4......................................................................................................................................... LiDAR Map Figure5.................................................................................................................................. NRCS Soils Map Figure6.................................................................................................................... Existing Conditions Map Figure7........................................................................................................................Mitigation Types Map Legend Project Centroid 8 -Digit HUCs Q Conservation Easements LWPs HUC 03040105 TLWs 0 50 100 v Miles Project is located in TLW HUC-14: 03040105010010 [5.ile,Y R5 Pu MAJ i, 0 7.5' 15-7 ==;Im� Miles HUC: 03040105 5 o Run Hopewell P P 4 3 to 0 a c a z firx,ar Asa a d il. wQ gra gy +p haw f' Y4 � a Za fa��`eek p* 4j e Caldwell ca �'[[ Bayes ,.o 41ag9� fid - CReatdwdt pePo[ R fp aY°4 _. - a - f+nae `+"na 73 f - Rn. Rd Sources: Esri; HERE, DeLorme, USGS, Intermap, increment P Corp 0 0.5 1 NRCAN-,-E-sri Japan, METI, Esri China (Hong Kong), Esri (Thailand) Mlles Mapmylndia, © QpenStreetM'ap contributors, and the GIS User Community FIGURE WATER & LAND Upper Rocky Project Location SOLUTIONS Mitigation Bank waterlandsolutions.com NAD 1983 2011 State Plane North Carolina FIPS 3200 FT US 0 4.r HUC: 03040105 5 o Run Hopewell P P 4 3 to 0 a c a z firx,ar Asa a d il. wQ gra gy +p haw f' Y4 � a Za fa��`eek p* 4j e Caldwell ca �'[[ Bayes ,.o 41ag9� fid - CReatdwdt pePo[ R fp aY°4 _. - a - f+nae `+"na 73 f - Rn. Rd Sources: Esri; HERE, DeLorme, USGS, Intermap, increment P Corp 0 0.5 1 NRCAN-,-E-sri Japan, METI, Esri China (Hong Kong), Esri (Thailand) Mlles Mapmylndia, © QpenStreetM'ap contributors, and the GIS User Community FIGURE WATER & LAND Upper Rocky Project Location SOLUTIONS Mitigation Bank waterlandsolutions.com NAD 1983 2011 State Plane North Carolina FIPS 3200 FT US Legends # ��* �1jLs`.. {= f►� `! Q URMB Limits__----� "` . ' `� • `+• E • til S j f .or .. Lltmoo -Ya �' C `r J e 00, 71 1 v - -i� • Tom. {f r 1 1 �`> + Copyn�h%34�Ijk�N at G,eogpaphic Society, i cubed WATER & LANDUpper Rocky USGS Topographic FIGURE Feet SOLUTIONS Mitigation Bank o iso 1,500 � Map waterlandsolutions.com NAD 1983 2011 State Plane 3 North Carolina FIPS 3200 FT US Legend Bank Limits LiDAR �! - + Elevation (ft) High : 912.889 � r III Low : 674.373 rip 1 14 or r 10 ell 4._- •rel — ,■ _ L r _ tT.`s or or I S06 _ '� _ , • -,.� � . � , of v 2 ! aF d' 1. & it ,j Mill IF m J.o -, • d'� . e " r�.AJs " f �P �" pOF r..�l ".r a •� OL Pr ■ rp c� y • r r 40 side 7� Jr " `�• . IS ;.. rj..�.r r+' it"• ' �- e.. ■.t yfl 41, e. I• r mr e Jr eT_ - �.r`-+ k '1 ,fey IL } >a � •' �e.. -" � � �' , ,�:. ', s ,� _�� I! -,J — fir- - FAA 4r 1p Al IN J PA J .J� .may �I"° - Ry.�, �'�,.,'� ..�r i. �`� Jj a� n � Opp ,iFL 10 LE AmW All F J10 so Rp 140 j .R 4 do ��AP P �+ ^i#'.182 J : . I r■ a p " -r '� ° F. - r .. • ..., .; Ip , may.. WATER & LANDFIGURE SOLUTIONS Upper Rocky Feet N LiDAR Map Mitigation Bank 0 500 1,000 A waterland solutions.com NAD 1983 2011 State Plane 4 North Carolina RIPS 3200 FT US Legend Project Reaches R4 — R6 R8 Wetlands R1 R5 R6A R9 ® URMB Limits R2 R5A R613 R10 R3 R513 — R7 Adjacent Streams 4` f R7 W2 ;; z - - 19 . v R3 R6B 'tet W3 r AL i L� R6 --Vow R6A R4 W6► 4 R5 W5 R5A WATER &LAND� FIGURE SOLUTIONS Upper Rocky Feet // Existing Conditions Mitigation Bank 0 300 600 waterlandsolutions.com NAD 1983 2011 State Plane 6 North Carolina FIPS 3200 FT US t Legend Q URMB Limits Wetland Mitigation Type Adjacent Streams Enhancement - 1 Stream Mitigation Type Preservation �' fii •--�. + Enhancement Rehabilitation, Preservation Re-establishment Restoration i • i�` t � .�ti ' n z � - , `t�- � - - #'ate` - - •' '• R8 W1 R7 r �. , ''ilk. _ z �,t '� • , ' - . _ R3 R10 - fir► R9 [R W2 W3 ! R6B R6 - - R6A W7 * R2 r R4 W4 x� R5 4 s I, R5B � 1 Y• j J f� _ R5A � � • dr WATER & LAND Upper Rocky Feet �%� Mitigation Types FIGURE SOLUTIONS Mitigation BankV 4 0 300 600 waterlandsolutions.com NAD 1983 2011 State Plane 7 North Carolina FIPS 3200 FT US Appendix B — Historical Aerials Appendix B —Historical Aerials Upper Rocky Mitigation Bank Prospectus Water & Land Solutions Page 1 Appendix B — Historical Aerials Figure1.....................................................................................................................1948 Aerial Photograph Figure2.....................................................................................................................1957 Aerial Photograph Figure3.....................................................................................................................1961 Aerial Photograph Figure4.....................................................................................................................1965 Aerial Photograph Figure5.....................................................................................................................1972 Aerial Photograph Figure6.....................................................................................................................1976 Aerial Photograph Figure7.....................................................................................................................1983 Aerial Photograph Figure8.....................................................................................................................1997 Aerial Photograph Figure9.....................................................................................................................2005 Aerial Photograph Figure10...................................................................................................................2016 Aerial Photograph Page 2 4 Legend U RM B Limits WATER & LAND SOLUTIONS watery andsolLbons.com Mot JAW - ,Pow i# Upper Rocky Mitigation Bank 7a; rip wrl :i N FIGURE Feet 1948 Aerial Photograph 0 250 Soo NAD 1983 2011 State Plane North Carolina FI PS 3208 FT US ... Legend , URMB Limits • s _ i _ r r J k -4. 1 'lJ l .i` -+ . a. ' -+e• cam. r Nk th 1 r: I e _ -r WATER & LAND SOLUTIONS water) and so lut ions.c om r l� 3 Upper Rocky Mitigation Bank b r � Y�t 1 •r 4 _y It N FIGURE Feet 1957 Aerial Photograph 250 goo NAD 1983 2011 State Plane 2 North Carolina FIPS 3200 FT US Legend r URMBLimits LF r amma xP jw 10 Of tw w 4 P R- �� s ` 3 ? a + - .Fid .. - - _ • r. '" A y �^ F �Y' y do amp dPr .AmF _A dr SL is i4* G »�wf ftv &1W A0 +,„, * e . IF .. # Ak Av OL ao �•lY i ,= 4 a +� a :. t. A' it t Amara E s 14 414 or - - WATER & LAND Upper Pocky Feet 1961 serial Photograph � FIGURE SOLUTIONS Mitigation Bank 0 250 500 A wate rl an ds o lutio ns. co m NAD 1983 2011 State Plane 3 North Carolina FIP S 3200 FT US 3 t Amara E s 14 414 or - - WATER & LAND Upper Pocky Feet 1961 serial Photograph � FIGURE SOLUTIONS Mitigation Bank 0 250 500 A wate rl an ds o lutio ns. co m NAD 1983 2011 State Plane 3 North Carolina FIP S 3200 FT US er _ pl a 5gend Rai Albr fF t 1'- - ., F 'P w' / -• _ .. s' g ''t y, >~ M � � L a+,r •CJI. ° .��r_ k -ti AAA � � � h _��.. 1 tet. 4 M � � � yam, .• •� ' 1 °� f e - u i � a � .. ' � • � ^+pit r `n k ± ' • 7 _ r. Y 4.0 _ - h - - kfr.- .� * r� .{ f � �;:. _'k' - .. r _4 _. - - ` u dt�k� - � -L - _ �r h _��, I � .k # �' ° • .. t p J ,. - ME '' #a is*-� t - ''ilea-y �I gyp.: _ • _ n Itl Y t.N - � ��-r,tr' z r � '��Y • f5`s�y '�`'� � L ' ' « r� �-'� • - P � ' IP�� l "r %+.r#'x' a ,r �; {I a}'°4r _ �`F .{I.' :+,_.• �a - zl #! 'i + r�ra 'i k,p - �+i { -f+ll i 'Y4'� �. �b _ _ -r+„' J .• ly t NI' _ •� *r - y' , y�l.� a�� -. . _ i p - tl d �Jr.�';� d-f�_'�� f �y-►" � ^.,...w' -.. - i. a tl. �'' A �� '� � ,� _ .���,,Y e'• _'1�J��F ��Y.� .. �`L�;7�-FIS _ - � •rt,'NI., .}, v� r •Y. ..: _ �. - � r<�� r i. �� r, # TF. r .�'t'rn ds.. ter° Y'' a _ - - r 1.d6 at 4Apfir. a k4 *.ot . RL -w r 1�. r r / - a It R '.. • ir4. . 40 _ ad 'i u a . ��. . � �, •,fit,= ,�° N I `� _ , .Noe" ION c Y l r � J !F I Aa a , tir y, 1 rAAk A Legend U RMB Limits • � 1 �' _ $�:.. a� � � ,fir '� r i� VE 9 Y �• fIr @ - - `' 'IF ■■w - y 4 40 WATER & LANA� FIGURE U pper Rocky Feet 1972 Aerial Photograph SOLUTIONS Mitigation Bank 0 250 600 k water la nds o lut ions. co m NAD 19832011 Smote Plane 5 North Carolina FIPS 3200 FT US rt P .,a r yy L $old `'YID r• {L i� i' r tId 1 URB Limits 5011 y .. �.:1 IM J. ,'r_ l .:. �. : +. T' �}�.� A ' . � _ r, �,-.,�,�'. '� z ` _ .pry d r r Y -. . — " _ 'kms s F y �' r ,, - -'�' ,. r •'� 'h �� - �- �� rJ� 1•�� - r : r' �r r ,. .. ,•, n f ;'r M p ' r- f yS _ , h - y ^ Al tF 4*lir IFO 1, 1y!`r r ; . T , y �4- , ,� j _ r'- �, � �� � . � �. �1�; � 41' tF� �, � s. ''� •may �� ���� _ � '. � T s ' {s i I , t r1r.� n 5 t-�.a �f' �. n -05�' ,fir � �•�rl -. ra , _4 i ' r ` G `4 r. : ,r : y e • ,r s ^ : Ile jr T, -� •.... _. _ r .-+. IL Poll or t • ` r { a + N i I. 'i r. ..pins 0 Ar " .°l WATER & LAND O LUM O N vlateH and solutions.com Upper Rocky ftp Rigation Bank N Feet0 250 500 A FIGURE 1997 Aerial Photograph NAD 19832011 State Plane is North Carolina F IPS 3200 FT US Logond URM B Limits • 1 4 a x , t Ole 1 Al �# I . , r - F , Ali ,� , it *'7Y A. ' �6 ]!I jai l + r' i.� r y,'i•i r'.f'iL-d: - 1',yy, - Y.•I r ",. .J 1 , " r dr'' alp!t4 { - ir fI "•�kt1 , , A , I 1 r'- + ~1 r .s1 I , ,Cie " r I ,} a_ 71 , ky r, r Iry �• d 1. I WATER & LAND SOLUTIONS v%aterl and so I uti on s.co m 0 , { + u AS tl a Y M ° r ��'�' • .� _ - ' , , • �'-.�, � LL Yob , - , , a j taj ` of +` 4� k ,J F ° i FIGURE Upper Rocky Feet N 2005 Aerial Photograph MIgatIQn Bank o 250 Sao NAD 1983 2011 State Plane North Carolina FIPS 3200 FTUS per' 4f -� -� '• rte- -' "Ff.I 'V! +e"q'.', 7 Legend`:, - "'- URMB LimitsIN '!^rte _ J f` Ld , e Ax • lb ' . �. �,� �I ,f ,�� :.' •'Ilii- �_ �. :. � fes• i - }G - .- _� Ak••t F del 4 !' IP -79x a j- lot orek' ie i or : Irl � J 1 ,r - w � �' � � J I�� �y�F I � r, I I� a • - ��'r:.! I� r4 ' ,I•, A ;, N' .. 4'� •� ' v' r. ' - ' - ih yam' "Al l [ Jam♦ �� tell, R1 i ! • s` yL i _ • Ir ' r+`` j, ".,r __ iy` a�'k':� '' �� �•�T � '. �i '�' � � �'� 1 _ `� d'y� " 41 A WATER & LANDFIGURE SOLUTIONS Upper Rocky Feet N 2016 Aerial Photograph Mitigation Bank o 250 500 A v5aterlandsolution s.com NAD 1983 2011 State Plane 10 North Carolina FIPS3200 FTUS Appendix C- Agent Authorizations Upper Rocky Mitigation Bank Prospectus AGENT AUTHORIZATION FORM PROPERTY LEGAL DESCRIPTION: STREET ADDRESS: 12001 Mayes Rd, Huntersville. NC 28078 PARCEL IDs: 00714102 & 00714106 Property Owner: Siorneboe, Paul& Marie Property Contact: ,Paul Biornebae J WATER & LAND SOLUTIONS 11030 Raven Ridge Rd Suite 119 Raleigh, NC 27614 wate rl an dsoiuti o n s. co m 919-614-5111 The undersigned, registered property owners of the above noted property, do hereby authorize s Abernethy, of Water -& Land Solutions. LLC Lo review my property and to show my property to the Interagency Review Team (IRT) for the purposes of mitigation project review. Property Owner's Address [if different than property above]: We hereby certify the above information submitted in this app]ication is true and accurate to the best of our knowledge. e Authorized Tignature Authorized Signature Date: �� 16 2014 Date: AGENT AUTHORIZATION FORM STREET ADDRESS: 12229 MaYes Rd. Huntersville. NC 2807$ PARCEL ID: _ 00755101 Property Owner: a Property Contact: Uorge Mayes 11 WATER & LAND SOLUTIONS 11030 Paven Hdge Fd s0te 119 Fblagh, NC27614 waterlarndmi0onaCom 919-614-5111 The undersigned, registered property owners of the above noted property, do hereby authorize of Water & Land Soh;tion5, LLC to review my property and to show my property to the Interagency Review Team [IRT] for the purposes of mitigation project review. Property Owner's Address [if different than property above]: We hereby certify the above information submitted in this application is true and accurate to the hest of our knowledge. Authorized Signature Authorized Signature Date: -7L) At Appendix D- Pre -construction Baseline Monitoring Efforts Upper Rocky Mitigation Bank Draft Prospectus ND Q c o0 go r- ° Z cn N Z v -r 3 m c� D cn c a3 m W � r m v ^., v cn 3 m o � ' v, •, `� v v 0 Z3 ♦ m 0 a ♦`fir ,f1' M,� t • 4.', 4 , AL 06T 19 # r « ti v f (D . w- y � 1 1• t �• n i CD 4 4p x s. 00 OD 9i i N ul rn '> (D wpoomr- 06" WOM gfir V306 AM CD 0, ilk CD (D IOWA *`'a • �/� �/V r ; ' om t w �7►a' ' .` 1 Ar N C m.. 1 c —` u c Cross Section Data Upper Rocky Mitigation Bank Pre -Construction Baseline Assessment Fifteen cross sections were surveyed throughout the proposed Bank. It should be noted that the existing conditions of on-site streams are considered to be highly unstable. Cross sections were recorded at representative sections to indicate the unstable and highly incised nature of each reach. In- field bankfull indicators were very difficult to identify. Therefore, for the purpose of depicting incision and stream conditions, regional curve relationships for cross sectional area were estimated and depicted on cross sections. Cross section locations are described in the existing conditions narrative. A Figure depicting the locations of these cross sections is included in this Appendix. Results of those surveys are shown in the figures and tables below. Cross Section Data Upper Rocky Mitigation Bank Cross Section 1, Reach R1 Riffle 148 106 Flood Dimensions 23.6 XS Area (sq ft) 104 ------------------------------------------------------------ --- 13.8 Width (ft) 102 Entrenchment Ratio 1.7 Mean Depth (ft) 0 �v m 100 Low Bank Height (ft) 2.5 Max Depth (ft) Lu 98 Low Bank Height Ratio 15.3 1.5 8.0 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 95 94.5 96 94 93.5 94 fl 5 1n 15 20 25 30 35 40 45 Width 0 10 20 30 40 50 60 70 Width Cross Section 2, Reach R2 Riffle 98-5 Bankfull Dimensions Flood Dimensions 23.6 XS Area (sq ft) 12.3 Width FPA (ft) 13.8 Width (ft) 0.9 Entrenchment Ratio 1.7 Mean Depth (ft) 10.5 Low Bank Height (ft) 2.5 Max Depth (ft) 4.2 Low Bank Height Ratio 15.3 1.5 8.0 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio Cross Section 2, Reach R2 Riffle 98-5 98 Flood Dimensions 5.1 97.5 8.9 Width FPA (ft) ------------------ ------------------------------------------------- ----- ----------------- Width (ft) 1.7 97 1.0 Mean Depth (ft) v 96.5 96 Low Bank Height (ft) 1.4 w 95.5 2.6 Low Bank Height Ratio 6.2 0.8 5.2 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 95 94.5 94 93.5 fl 5 1n 15 20 25 30 35 40 45 Width Bankfull Dimensions Flood Dimensions 5.1 XS Area (sq ft) 8.9 Width FPA (ft) 5.1 Width (ft) 1.7 Entrenchment Ratio 1.0 Mean Depth (ft) 3.6 Low Bank Height (ft) 1.4 Max Depth (ft) 2.6 Low Bank Height Ratio 6.2 0.8 5.2 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio Cross Section Data Upper Rocky Mitigation Bank Cross Section 3, Reach R3 (Downstream of 2 major headcuts) 98 Riffle 97 96 ---------- ----- - ----------------- 95 c94 �3 c� V2 LL91 90 89 88 -20 -10 0 10 20 30 40 50 Width Cross Section 4, Reach R3 (Downstream of one major headcut, upstream of one major headcut) Riffle 100 99 ------------------------- - -- -- - --------------- 98 C97 X96 aa)95 w 94 93 92 -15 -10 -5 0 5 10 15 20 25 Width Bankfull Dimensions Flood Dimensions 10.1 XS Area (sq ft) XS Area (sq ft) 8.0 Width FPA (ft) 6.1 2.2 Entrenchment Ratio Width (ft) 1.3 Entrenchment Ratio 1.7 3.3 Mean Depth (ft) 6.5 Low Bank Height (ft) 2.1 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio Max Depth (ft) 3.1 Low Bank Height Ratio 8.5 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 1.2 3.7 Cross Section 4, Reach R3 (Downstream of one major headcut, upstream of one major headcut) Riffle 100 99 ------------------------- - -- -- - --------------- 98 C97 X96 aa)95 w 94 93 92 -15 -10 -5 0 5 10 15 20 25 Width 3 Bankfull Dimensions Flood Dimensions 10.0 XS Area (sq ft) 12.9 Width FPA (ft) 5.8 Width (ft) 2.2 Entrenchment Ratio 1.7 Mean Depth (ft) 6.0 Low Bank Height (ft) 3.3 Max Depth (ft) 1.8 Low Bank Height Ratio 9.7 1.0 3.4 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 3 Cross Section Data Upper Rocky Mitigation Bank Cross Section 5, Reach R3 (Upstream of two major headcuts) 101 100.5 100 99.5 c99 *5 098 97.5 97 96.5 96 Riffle -20 -10 0 10 20 30 40 50 60 Width Cross Section 6, Reach R5 Riffle 96 Bankfull Dimensions Flood Dimensions 10.1 XS Area (sq ft) 7.1 Width FPA (ft) 5.5 Width (ft) 5.3 Entrenchment Ratio 1.8 Mean Depth (ft) 3.0 Low Bank Height (ft) 2.1 Max Depth (ft) 1.4 Low Bank Height Ratio 11.3 0.7 3.5 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio Cross Section 6, Reach R5 Riffle 96 95 Flood Dimensions 3.3 XS Area (sq ft) 6.9 Width FPA (ft) 94 Width (ft) 1.4 Entrenchment Ratio 0.6 Mean Depth (ft) 93 1.2 Max Depth (ft) 6.4 Low Bank Height Ratio 5.9 0.6 7.9 0 92 �v 91 y w 90 89 88 87 0 5 10 15 20 25 30 35 40 45 50 Width 4 Bankfull Dimensions Flood Dimensions 3.3 XS Area (sq ft) 6.9 Width FPA (ft) 5.1 Width (ft) 1.4 Entrenchment Ratio 0.6 Mean Depth (ft) 7.3 Low Bank Height (ft) 1.2 Max Depth (ft) 6.4 Low Bank Height Ratio 5.9 0.6 7.9 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 4 Cross Section 7, Reach R5 96 95 ------------ ---- 94 93 092 M91 w90 89 88 87 0 10 20 Riffle 30 40 Width Cross Section Data Upper Rocky Mitigation Bank 50 60 Cross Section 8, Reach R4 Riffle Bankfull Dimensions Flood Dimensions 11.0 XS Area (sq ft) 11.7 Width FPA (ft) 7.2 Width (ft) 1.6 Entrenchment Ratio 1.5 Mean Depth (ft) 7.6 Low Bank Height (ft) 2.5 Max Depth (ft) 3.0 Low Bank Height Ratio 9.0 1.2 4.7 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio Cross Section 8, Reach R4 Riffle 99 98 Flood Dimensions 5.2 97 5.9 Width FPA (ft) 5.2 96 1.1 Entrenchment Ratio 1.0 ------- ---------- --------- ---------------------- 95 ------------------------- ----------------------- 1.2 O OF 5.0 Low Bank Height Ratio 6.6 0.8 5.2 94 93 �j 92 91 90 89 0 5 10 15 20 25 30 35 WIM 5 Bankfull Dimensions Flood Dimensions 5.2 XS Area (sq ft) 5.9 Width FPA (ft) 5.2 Width (ft) 1.1 Entrenchment Ratio 1.0 Mean Depth (ft) 6.0 Low Bank Height (ft) 1.2 Max Depth (ft) 5.0 Low Bank Height Ratio 6.6 0.8 5.2 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 5 Cross Section Data Upper Rocky Mitigation Bank Cross Section 9, Reach R4 Riffle 97-5 Flood Dimensions 5.0 XS Area (sq ft) 20.0 Width FPA (ft) 6.2 Width (ft) 3.2 Entrenchment Ratio 0.8 97 1.7 Low Bank Height (ft) 1.2 Max Depth (ft) 96-5 6.8 0.7 7.6 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 2.0 ----------------- -------------------- ----- ----------------------------------- 0 Wetted Perimeter (ft) 1.0 Hydraulic Radius (ft) 96 m Lu 95.5 95 94.5 6 5 10 15 20 25 Width Cross Section 10, Reach R6 96 95 94 X93 �2 (D91 w90 89 88 1:7iiin- 10 15 20 25 30 Width Bankfull Dimensions Flood Dimensions 5.0 XS Area (sq ft) 20.0 Width FPA (ft) 6.2 Width (ft) 3.2 Entrenchment Ratio 0.8 Mean Depth (ft) 1.7 Low Bank Height (ft) 1.2 Max Depth (ft) 1.4 Low Bank Height Ratio 6.8 0.7 7.6 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 2.0 Cross Section 10, Reach R6 96 95 94 X93 �2 (D91 w90 89 88 1:7iiin- 10 15 20 25 30 Width Bankfull Dimensions Flood Dimensions 6.6 XS Area (sq ft) 23.0 Width FPA (ft) 4.4 Width (ft) 5.3 Entrenchment Ratio 1.5 Mean Depth (ft) 5.1 Low Bank Height (ft) 2.5 Max Depth (ft) 2.0 Low Bank Height Ratio 6.9 Wetted Perimeter (ft) 1.0 Hydraulic Radius (ft) 2.9 Width -Depth Ratio Cross Section 11, Reach R5 96 95 94 93 092 X91 Lu 89 88 87 in 10 20 Riffle Width 30 Cross Section Data Upper Rocky Mitigation Bank 40 50 Cross Section 12, Reach R6 98 97 96 95 94 0993 `c 92 X91 w90 89 88 87 is 10 20 Riffle Width 47 40 50 Bankfull Dimensions Flood Dimensions 10.3 XS Area (sq ft) 10.3 Width FPA (ft) 6.9 Width (ft) 1.5 Entrenchment Ratio 1.5 Mean Depth (ft) 7.3 Low Bank Height (ft) 2.3 Max Depth (ft) 3.2 Low Bank Height Ratio 8.9 1.2 4.7 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 1.6 Cross Section 12, Reach R6 98 97 96 95 94 0993 `c 92 X91 w90 89 88 87 is 10 20 Riffle Width 47 40 50 7 Bankfull Dimensions Flood Dimensions 5.6 XS Area (sq ft) 37.0 Width FPA (ft) 5.6 Width (ft) 6.6 Entrenchment Ratio 1.0 Mean Depth (ft) 6.7 Low Bank Height (ft) 4.3 Max Depth (ft) 1.6 Low Bank Height Ratio 12.1 0.5 5.5 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio 7 Cross Section 13, Reach R6 96.5 96 95.5 C °95 fro {Gmi7 Cross Section Data Upper Rocky Mitigation Bank Riffle 0 5 10 15 20 25 30 35 40 Width Cross Section 14, Reach R9 96 95 94 93 c92 �091 a>90 w89 88 87 86 0 Riffle 10 20 30 40 50 60 Width Bankfull Dimensions Flood Dimensions 8.2 XS Area (sq ft) 36.5 Width FPA (ft) 14.7 Width (ft) 2.5 Entrenchment Ratio 0.6 Mean Depth (ft) 1.2 Low Bank Height (ft) 1.1 Max Depth (ft) 1.1 Low Bank Height Ratio 15.4 0.5 26.3 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio Cross Section 14, Reach R9 96 95 94 93 c92 �091 a>90 w89 88 87 86 0 Riffle 10 20 30 40 50 60 Width M Bankfull Dimensions Flood Dimensions 4.7 XS Area (sq ft) 11.6 Width FPA (ft) 6.7 Width (ft) 1.7 Entrenchment Ratio 0.7 Mean Depth (ft) 8.2 Low Bank Height (ft) 2.1 Max Depth (ft) 4.0 Low Bank Height Ratio 9.4 Wetted Perimeter (ft) 0.9 Hydraulic Radius (ft) 6.0 Width -Depth Ratio M Cross Section Data Upper Rocky Mitigation Bank Cross Section 15, Reach R10 Riffle 96 95 Flood Dimensions 0.9 XS Area (sq ft) 94 1.9 Width (ft) 1.3 Entrenchment Ratio 93 Mean Depth (ft) 5.7 Low Bank Height (ft) 0.6 a 92 10.2 Low Bank Height Ratio 2.6 0.3 4.4 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio a m Lu 91 94 89 a 2 4 6 8 10 12 14 Width Bankfull Dimensions Flood Dimensions 0.9 XS Area (sq ft) 2.4 Width FPA (ft) 1.9 Width (ft) 1.3 Entrenchment Ratio 0.4 Mean Depth (ft) 5.7 Low Bank Height (ft) 0.6 Max Depth (ft) 10.2 Low Bank Height Ratio 2.6 0.3 4.4 Wetted Perimeter (ft) Hydraulic Radius (ft) Width -Depth Ratio Ground Water Monitoring Preliminary Results Upper Rocky Mitigation Bank Pre -Construction Baseline Assessment — July 2016 Thirteen Onset HOBO U20L-04 (13 foot) Data Loggers were installed throughout the Bank premises to measure groundwater in areas where wetland preservation, restoration, enhancement, or rehabilitation may occur (Figure 1-D). These wells were installed in April 2016. Preliminary results of the ground water levels are being recorded daily and will be provided. Comprehensive results will be compared to rainfall data and used to evaluate areas for wetland restoration. Benthic Macroinvertebrate Monitoring Results Upper Rocky Mitigation Bank Pre -Construction Baseline Assessment — Summer 2016 WLS staff collected benthic macrointerebrate samples at two locations within the proposed Upper Rocky Mitigation Bank in July of 2016 in accordance with the Division of Water Resources Biological Assessment Branch (BAB) Qual 4 sampling protocol (NCDWR 2016). The macroinvertebrate collection sites (Figure 1-D) were a subset of four water quality sites that were monitored for temperature, pH, dissolved oxygen, and specific conductance. Identification and bioclassification of the samples were conducted by Penrose Consulting in August 2016. Table 1 summarizes the results of this bioclassification. Little to no habitat existed for macroinvertebrates at Site 1. The stream was channelized and filled in with sediment from upstream construction activities. No riffle pool structure was present. At Site 2, there was suitable habitat. Although the channel is deeply incised, there are riffles and pools present and there is a mixture of cobble, gravel, and sand. No macroinvertebrates were found at Site 1; therefore, it receives a classification of "Poor'. Some macroinvertebrates were found at Site 2 and are shown in Table 1. Site 2 received a classification of "Fair". Benthic Macroinvertebrate Monitoring Results Upper Rocky Mitigation Bank Table 1. Bioclossification of Macroinvertebrate Samples Collection Location Site 1 Site 2 Collection Date (mo/year) 7/6/2016 7/6/2016 Taxa Name (Biotic Index value) Trichoptera Family Hydropsychidae Cheumatopsyche spp (6.6) 1 Diplectrona modesta (2.3) 1 Hydropsyche betteni (7.9) 2 Diptera: Miscellaneous families Family Simuliidae Simulium spp (4.9) 2 Family Tipulidae Tipula spp (7.5) 1 Chironomidae Parametriocnemus lundbecki (3.7) Polypedilum aviceps (3.6) Polypedilum illinoense grp. (8.7) Polypedilum halterale (7.4) Polypedilum scalaenum (8.5) 1 Rheotanytarsus spp (6.5) Odonata Family Coenagrionidae Argia spp (8.3) Oligochaeta Family Lumbriculidae (7.0) Crustacea Family Asellidae Family Cambaridae (immature) (7.5) Total Taxa Richness 0 6 EPT Taxa Richness 0 3 EPT Abundance 0 4 Biotic Index 0 6.31 Number of taxa = 2.5 or less 0 1 DWR piedmont criteria for small streams Poor Fair Benthic Macroin vertebrate Monitoring Results Upper Rocky Mitigation Bank References NCDWR. 2016. Standard Operating Procedures for Collection and Analysis of Benthic Macroinvertebrates. NC Division of Water Resources, Biological Assessment Branch. Version 5.0, February 2016. Accessed via: https:Hncdenr.s3.amazonaws.com/s3fs- public/Water%20Quality/Environmental%20Sciences/BAU/NCDWRMacroinvertebrate-SOP- February%202016_final.pdf 3 Water Quality Monitoring Results Upper Rocky Mitigation Bank Pre -Construction Baseline Assessment - Summer 2016 Water quality measurements included surface water temperature (°C), dissolved oxygen (mg/L and %), specific conductance (µS/cm at 25 °C), and pH. Measurements were made in accordance with NCDWQ guidance (NCDENR DWQ 2013). All measurements were made in situ in a representative point of the channel that was flowing and generally at the thalweg. Measurements were made using an YSI Professional Plus Instrument at four different representative locations during July of 2016. Table 1 outlines the results. Water quality measurements were recorded during baseflow conditions at four locations within the proposed Bank (Figure 1-D). Table 1 Site ID Temperature (°C) Dissolved Oxygen (mg/L) Dissolved Oxygen (%) Specific Conductance (µS/cm) pH U R-1 22.3 6.54 74.7 116.7 7.70 U R-2 21.3 6.34 71.3 175.6 7.18 UR -3 22.0 4.79 54.9 129.6 7.46 UR -4 21.7 6.42 73.5 158.9 7.43 Results of monitoring efforts were analyzed based on guidance from the "REDBOOK" published by NCDENR DWQ in 2003. The temperature results ranged from 21.3° C to 22.3° C. Temperatures should not exceed 2.8 degrees above natural water temperature and should never exceed 29° C. Our results therefore reflected a normal seasonal range. The water quality standard for dissolved oxygen in non - trout waters of North Carolina is to remain above a daily average of 5.0 mg/L with a minimum value of 4.0 mg/L. The results of dissolved oxygen in the Bank easement boundaries ranged from 4.79 mg/L to 6.54 mg/L. Only one sample point was below 5.0 mg/L and no sampling points were below the minimum value. The pH should range between 6.0 SU and 9.0 SU generally, except in backwater conditions where the pH may be as low at 4.3 SU. Inside the Bank easement boundaries the pH ranged from 7.18 SU to 7.70 SU, well within a normal pH range. The specific conductance (SPC) was also measured at all four sampling locations and ranged from 116.7 SPC to 175.6 SPC. The approximate values that can be expected for specific conductance of a freshwater streams are between 100-200 µS/cm, considered to be wide rangeing due to in -stream geology. The values collected on-site fall within the expected values. Water Quality Monitoring Results Upper Rocky Mitigation Bank References NCDENR DWQ. 2003. "REDBOOK" Surface Waters and Wetlands Standards, (NC Administrative Code 15A NCAC 02B .0100 &.0200) Accessed via: https://www.epa.gov/sites/production/files/2014- 12/documents/nc-classifications-wgs.pdf NCDENR DWQ. 2013. Intensive Survey Branch Standard Operating Procedures Manual: Physical and Chemical Monitoring, version 2.1, December 2013. Accessed via: https://ncdenr.s3.amazonaws.com/s3fs-public/document-library/Appendix%207%20- %201SB%20SO P%20ver%202.1-Dec.2013. pdf 2