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HomeMy WebLinkAbout20130630 Ver 1_N Fork Little River Prospectus_20130617North Fork Little River Nutrient Offset and Riparian Buffer Site Durham County, NC Falls Lake Drainage Basin H U C 03020201 DRAFT Prospectus June 203.3 Prepared by: Wildlands Engineering, Inc. 5605 Chapel Hill Rd, Suite 122 Raleigh, NC 27607 Phone: 91g -851 -9986 Fax: 919 -851 -9987 .....m D —low ..a. ., .....�..�....M J UN 201 w 3.0 4.0 North Fork Little River Nutrient Offset and Riparian Buffer Site H U C 03020201 DRAFT Prospectus TABLE OF CONTENTS Site Introduction and Goals ............................................................ ............................... 2 1.1 Introduction ................................................................... ............................... 2 1.2 Site Location .................................................................. ............................... 2 1.3 Site Goals ....................................................................... ............................... 2 1.4 Bank Sponsor ................................................................... ..............................3 Establishment and Operation of Mitigation Bank ........................... ............................... 3 2.1 Bank Credits ................................................................... ............................... 4 2.2 Proposed Service Area ................................................... ............................... 4 2.3 Qualifications of Bank Sponsor ...................................... ............................... 4 Ecological Suitability of Site ........................................................... ............................... 5 3.1 Existing Site Vegetation ................................................... ..............................5 3.2 Technical Feasibility of the Site ........................................ ..............................5 Site Maintenance and Long -Term Sustainability ............................ ............................... 5 4.1 Site Maintenance ............................................................. ..............................5 4.2 Long Term Management Provisions for the Site ............... ..............................5 FIGURES Figure 1 Vicinity Map Figure 2 Location Map Figure 3 Service Area Figure 4 Site Map North Fork Little River Nutrient Offset and Riparian Buffer Site Page 1 Neuse 03020201- Draft Prospectus North Fork Little River Nutrient Offset and Riparian Buffer Site HUC 03020201 DRAFT Prospectus The North Fork Little River Site ( "Site ") is proposed as part of Wildlands Engineering's proposed Fall Lake Basin HUC 03020202 umbrella mitigation bank ( "Bank "). The Site shall be planned and designed encompassing land along an unnamed tributary to the North Fork of the Little River in Durham County, NC. The purpose of the Bank is to create nutrient and riparian buffer mitigation credits to compensate for land development projects that require nutrient offset and riparian buffer payments that cannot be achieved on -site. 1.0 Site Introduction and Goals 1.1 Introduction The Site involves the restoration of riparian buffers ( "buffers ") in order to help reduce non - point source discharge of nutrients and other contaminants into stream channels within the Falls Lake watershed and the Neuse River Basin. The proposed nutrient offset and riparian buffer site would protect approximately 33 acres of land on the Site with a permanent conservation easement. Buffer widths will range from fifty feet to over two hundred feet from the top of the stream bank. 1.2 Site Location The proposed Site is located in northwestern Durham County, approximately 14 miles north of the City of Durham (Figure 1). To get to the Site, travel north on U.S. Highway 5o1 North from downtown Durham for approximately 12.7 miles. Turn left onto S. Lowell Road and continue west for approximately 1.9 miles to the intersection with Johnson Mill Road. The Site will be on the north side of S. Lowell Road at this intersection. The proposed Site is located in a rural watershed within the Neuse River Basin (HUC 03020201) and within sub -basin 02- 00 -10. The unnamed tributary on the Site flows into the North Fork of the Little River (Figure 2), which then flows into the Little River, the Little River Reservoir, the Eno River, and ultimately into Falls Lake. All of these water bodies are classified as Nutrient Sensitive Waters (NSW) by the North Carolina Division of Water Quality (NCDWQ). The Little River Reservoir is a major source of drinking water for the City of Durham, Falls Lake is a major source of drinking water for the City of Raleigh. To protect these reservoirs, the Little River is classified as Water Supply II (WS -II) and as a High Quality Water(HQW) by NCDWQ. 1.3 Site Goals The proposed nutrient offset and riparian buffer site described above will provide numerous ecological benefits within the Falls Lake watershed and the Neuse River Basin. While some of these benefits are limited to the project area, others, such as pollutant removal and improved aquatic and terrestrial habitat have more far - reaching effects. The primary goal of the Site will be to restore the nitrogen removal capacity of the stream channels and adjacent riparian areas. North Fork Little River Nutrient Offset and Riparian Buffer Site Page 2 Neuse 03020201 - Draft Prospectus Other expected improvements to water quality and ecological processes from the project are outlined below in Table 1. Tables. Site Goals and Methods of Achievement North Fork Little River Nutrient Offset and Riparian Buffer Site Nutrient removal from On -site nutrient inputs will be decreased by removing the row crops land conversion and fertilizer applications within the proposed conservation easement. Nutrient removal from Nutrient loads will be decreased by denitrification processes within creekflow the restored stream channels. Runoff from adjacent upland areas will be filtered through the restored riparian buffers. Floodwaters will be filtered through restored floodplain areas, where native vegetation will uptake excess nutrients. Sediment removal from Floodwaters during high rainfall events that contain grit and fine creeks sediment will be filtered through restored floodplain areas, where flow will spread through native vegetation, thereby reducing velocity and allowing sediment to settle out. Sediments will be filtered from overland flow by the restored riparian buffers before entering stream channels on the Site. Restoration of terrestrial Adjacent terrestrial and riparian buffer habitats will be restored habitat with native vegetation as part of the project. Native vegetation will provide cover and food for terrestrial wildlife. 1.4 Bank Sponsor This Site is presented as part of the proposed Neuse River Basin HUC 03020201 umbrella banking instrument sponsored by Wildlands Engineering, Inc., ( "Sponsor "). Contact information for this Bank is provided below. Wildlands Engineering, Inc. 56o5 Chapel Hill Road, Suite 122 Raleigh, NC 27607 Phone: g19- 851 -9986 Fax: 91g- 851 -9987 Attn: John Hutton Email: jhutton@a wildlandseng.com 2.0 Establishment and Operation of Mitigation Bank An option agreement for the general project area has been signed by the property owner and a Memorandum of Option is recorded at the Durham County Register of Deeds. The option agreement allows the Sponsor to restrict the land use in perpetuity through a conservation easement. Upon completion of the review process for the Site prospectus, the Sponsor will submit a detailed Bank Parcel Development Package (BPDP) and Umbrella Banking Instrument (UMBI). The North Fork Little River Nutrient Offset and Riparian Buffer Site Page 3 Neuse 03020203. - Draft Prospectus UMBI will provide detailed information regarding bank operation. Once the final BPDP is approved and the accompanying UMBI is executed by the NCDWQ, the Sponsor will record a conservation easement on the Site. 2.1 Bank Credits The use of credits from the Bank to offset development projects that require purchase of off - site nutrient offset and riparian buffer credits will be consistent with rules adopted by the Environmental Management Commission and all other applicable authorities. Prior to the release of credits, the following requirements will be met: • NCDWQ approval of the final BPDP and execution of the UMBI, • recordation of the conservation easement, and • establishment of appropriate financial assurances. 2.2 Proposed Service Area The Bank will be established to provide mitigation credit to compensate for development - related impacts to riparian buffers and for required nutrient offset payments within the proposed service area (Figure 3). This service area consists of the Falls Lake drainage area (Upper and Lower Falls Drainage) within Hydrologic Unit 030202oz. The service area includes portions of the Counties of Person, Granville, Orange, Durham, Wake, and Franklin. A specific geographic limit of applicability in no way compromises any state agency's ability to accept or reject the use of a bank for any given impact. 2.3 Qualifications of Bank Sponsor The Sponsor, Wildlands Engineering (Wildlands), is a multidisciplinary group of professionals that bring together the expertise necessary to create outstanding water quality restoration projects in a timely and cost effective manner. Wildlands has offices in Charlotte and Raleigh, North Carolina and Charlottesville, Virginia. Our 22 employees dedicated to environmental restoration have positioned Wildlands as a leader in ecosystem restoration in the southeastern United States. Wildlands has completed one nutrient bank and is in the process of developing twelve full - delivery projects, including two buffer mitigation projects, through the North Carolina Ecosystem Enhancement Program. To execute buffer mitigation projects, Wildlands assembles a team of project- specific subcontractors to perform surveying and construction services. Each of these subcontractors has substantial experience in stream and buffer restoration in North Carolina and a substantial full -time professional staff presence in North Carolina. Wildlands staff members have worked with all of these sub - contractors on numerous occasions. Wildlands believes that early coordination and frequent communication with subcontractors ensures that everyone understands their role in the project and can complete tasks in a timely and efficient manner. North Fork Little River Nutrient Offset and Riparian Buffer Site Page 4 Neuse 03020201 - Draft Prospectus 3.0 Ecological Suitability of Site 3.1 Existing Site Vegetation The project area consists primarily of open agricultural fields currently in row crop for corn production (Figure 4). Streams and ditches on the property have little to no existing riparian buffer. Existing stream and ditch banks are mowed in most locations on an annual basis. 3.2 Technical Feasibility of the Site Based on the results of the preliminary investigations, the Sponsor determined that the subject Site has buffer restoration potential that could be considered for development of a viable commercial mitigation bank. Actions required to develop the subject Site for mitigation would require altering current land use practices to sustain a stable long -term natural riparian environment. The streams are shown as blue line streams on the 1976 Durham County Soil Survey (Figure 5) and on the Rougemont USGS 7.5' Quadrangle map (Figure z). Buffer restoration would involve replanting appropriate native tree and shrub species along the buffer corridor. Herbaceous riparian vegetation will also be planted but will generally re- establish naturally. Intensive vegetation management and a rigorous herbicide schedule will need to be implemented over the first few years in the riparian buffer restoration areas to prevent establishment of invasive species that will out - compete the planted native vegetation. 4.0 Site Maintenance and Long -Term Sustainability 4.1 Site Maintenance Adaptive measures will be developed or appropriate remedial actions will be implemented in the event that the Site or a specific component of the Site fails to achieve the success criteria outlined in the final UMBI. The project specific monitoring plan developed during the design phase will identify an appropriate threshold for maintenance intervention based on the monitored items. Any actions implemented will be designed to achieve the success criteria that will be specified in the UMBI, and will include a work schedule and updated monitoring criteria. 4.2 Long Term Management Provisions for the Site The Sponsor will institute a Long Term Management Plan responsible for assessing the condition of the Site and implementing maintenance provisions to maintain performance of the Site. The proposed conservation easement will help to ensure that only NCDWQ- allowable activities take place. To monitor the Site's continued success, the Long Term Management Plan will be implemented following the five -year monitoring period. All components of the Site will be inspected annually or less frequently as needed to ensure that the project remains stable in perpetuity. Sources of instability or other deficiencies will be addressed. Invasive species will be managed annually or less frequently as needed to ensure the long term survivability of the planned native vegetation community. All reporting will be documented and kept on file for future reference. North Fork Little River Nutrient Offset and Riparian Buffer Site Page 5 Neuse 03020201 - Draft Prospectus 8 ^ 8 r � � Digit H C u �10 '0300, 03 olb"i0� t a' r "0 ©10102 t t aY" { ,a 3010,1 4, t Rooiq t ion t Itt'S t V koc x^ rT i k a td ,i ;'. 1, 03020102 t 6 it j�u i�YL"I! 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