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IORRGSODLQGHYHORSPHQWSHUPLWDQGDVVRFLDWHG&/205/205ZLOOEHDFTXLUHGIURPWKHORFDO)(0$DGPLQLVWUDWRU F:KDWVRXUFHVGLG\RXXVHWRPDNHWKHIORRGSODLQGHWHUPLQDWLRQ" )(0$)LUP3DQHOV.DQG/ .HOO\7KDPHV $SSOLFDQW$JHQW V3ULQWHG1DPH 'DWH 24 PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 1 Additional Supplemental Information Stowe Regional Wastewater Resource Recovery Facility (RWRRF) & Associated Infrastructure Projects B3d. Explain the purpose of the proposed project. Charlotte Water (the Applicant) provides wastewater services to more than 805,000 customers in the City of Charlotte and surrounding areas in Mecklenburg County, including the towns of Matthews, Mint Hill, Pineville, Huntersville, and Cornelius. Population growth and land development in the Charlotte region have resulted in an increased need for wastewater collection and treatment. Charlotte Water, formerly Charlotte-Mecklenburg Utilities (Utilities), undertook a comprehensive evaluation of current and anticipated future wastewater treatments needs by performing a Wastewater Treatment Plant Expansion Study (Expansion Study, CH2M Hill, 2007). The Expansion Study focused on three wastewater treatment plants (WWTPs), the Irwin Creek WWTP, Sugar Creek WWTP, and McAlpine Creek Wastewater Management Facility (WWMF). Combined, these facilities have a total maximum month rated treatment capacity of 99 million gallons per day (mgd). This capacity treats a population that was projected to be 685,000 in 2010, increasing to 923,000 in 2030.1 The Expansion Study determined that the best approach toward meeting future wastewater capacity needs would include construction of a new regional WWTP to provide wastewater services to the Long Creek Basin and expansions/rehabilitations of existing WWTP facilities (Figure 1a and 1b, Appendix E). This would increase wastewater capacity from 99 mgd to 155 mgd by 2030. Concurrently, a Feasibility and Preliminary Planning Study for Regional Wastewater Treatment (Feasibility Study [Black & Veatch, 2006]) was conducted to provide long-range planning for wastewater treatment for the City of Mount Holly and the Long Creek Basin in Mecklenburg County. This high level feasibility study focused on developing an innovative solution to meet the needs of the growing area. In 2011, Black & Veatch, submitted an Environmental Impact Study (EIS) in compliance with the North Carolina State Environmental Protection Act (SEPA), evaluating options for wastewater treatment needs based on The Expansion and Feasibility Studies. This Project, the subject of this permit application, is Alternative 2 which proposes a regional WTTP in Mecklenburg County to provide wastewater treatment for Mt. Holly and Belmont in Gaston County, and the Long Creek Basin in Mecklenburg County. Alternative 2 was selected as the Preferred Alternative because it meets the purpose and need of the project and results in a combination of fewer negative environmental consequences. As a result of the proposed project, the EIS assessed potential impacts to environmental and social resources, evaluated alternatives, and considered direct and cumulative impacts. The Record of Decision (ROD) was issued on March 18th, 2015. 1 According to the United States Census Bureau, the 2010 Census indicated that the population of Mecklenburg County was over 919,500 as of 2009 and the 2019 population estimates are approximately 1.09 million.2 2 https://www.census.gov/quickfacts/fact/table/mecklenburgcountynorthcarolina# PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 2 A revision to the ROD was submitted in December 2019 to include the analysis of additional land clearing and the need for a second road access to the proposed Stowe Regional Water Resource Recovery Facility (RWRRF). The revised ROD was issued on January 2nd, 2020. The revised ROD can be found in Appendix D. In order to meet the need of increasing population growth and increasing wastewater treatment capacity, the identified solution is to construct a new RWRRF in Mecklenburg County (Alternative 2 of the EIS). The implementation of this project will occur in phases (Figure 2, Appendix E). Therefore, the purpose of this project is to construct the Stowe RWRRF & Associated Infrastructure Projects to meet the increasing population growth demands for the treatment of wastewater for Mt. Holly, Belmont, and the Long Creek Basin in Mecklenburg County, and results in a combination of fewer negative environmental consequences. Associated infrastructure related to the Stowe RWRRF include new pump stations and forcemains installed by horizontal directional drilling (HDD) methods for Mt. Holly and Belmont, facility access roads, a Stowe Pump Station and Headworks project at the existing Long Creek Pumping Station (PS), and a future expansion of the proposed facility (Figures 3 and 4, Appendix E). B3e. Describe the overall project in detail, including the type of equipment to be used. This Project proposes a regional WWTP (Stowe RWRRF) in Mecklenburg County, located approximately adjacent to the existing Long Creek Pumping Station (PS). This regional facility would initially have a treatment capacity of 15 million gallons per day (mgd) and have the ability to take wastewater flows from two existing facilities: the Mt. Holly Wastewater Reclamation Facility (WRF) and Clariant, an adjacent industrial facility; and wastewater flows from the Long Creek basin (Figures 1a and 1b, Appendix E). Through a future expansion, the Stowe RWRRF would treat 25 mgd and be able to handle wastewater flows from the Belmont WWTP via the Paw Creek PS (Figure 2, Appendix E). Once connected to the Stowe RWRRF through the proposed project, the effluent outfalls at the Mt. Holly WRF and the Belmont WWTP would be eliminated. Prior to the Stowe RWRRF construction, the Charlotte Water wastewater treatment system would treat flows from the Mt. Holly WRF and the Belmont WWTP. It would also eliminate the need for expansions and rehabilitations of the outdated Mt. Holly and Belmont facilities while still serving existing and anticipated treatment capacity needs for the region. The US Army Corps of Engineers (USACE) requested that the Applicant submit a project-wide Clean Water Act (CWA) Section 404 application to include future construction projects (elements) that would propose impacts to Waters of the U.S. (WoUS). This permit will take a phased approach, providing design and details on the most imminent elements of the Project, while providing only high-level planning details for future elements yet to be designed (Table 1). PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 3 Table 1. Phasing for the Proposed Stowe RWRRF Elements Proposed Stowe RWRRF Elements Proposed Impacts NWP No. Phase Anticipated Construction Dates Section 10 Section 404 Non- Section 404 Mount Holly Forcemains (HDD) and Stowe Site Preparation Yes Yes No 12 1a 08/20-2/21 Stowe RWRRF Access Roads No Yes Yes 14 1b 10/20-12/21 Stowe Headworks & Influent Pumping Station and Mount Holly Pumping Station No No No n/a 1c 2021-2023 Stowe Regional Water Resource Recovery Facility Yes No Yes 12 2a 2021-2024 (TBD) Belmont Pumping Station and Forcemains Yes No No 12 2b 2022-2024 (TBD) Stowe RWRRF Expansion No No No n/a 3 TBD in 2035 to 2040 This permit application seeks authorization for Phase 1 out of three phases (Figure 3, Appendix E). Section B6b describes future Phases 2 and 3. Total impacts to WoUS for all phases are provided in Table 2. Table 2. Total Project Impacts for Phase 1-3 Impact Type Total (ac) Total Section 10/404 Stream Impacts: <0.10 ac* Total Section 404 Wetland Impacts: 0.20 ac Total Non-Section 404 Isolated Wetland Impacts: 0.22 ac *estimated surface water impact amount. Phase 1 (this Permit) In Phases 1a through 1c, the existing Long Creek PS would be replaced with a new pump station and headworks facility on the same site in order handle wastewater flows from the Mt. Holly WRF (Figure 5, Appendix E). These flows would be pumped beneath the Catawba River to the replaced Long Creek PS by horizontal directional drilling (HDD) methods, would continue from the current Long Creek PS site to the Paw Creek PS, and then on to larger Charlotte Water treatment facilities via the existing system (Figure 2, Appendix E). A new pumping station would be constructed at the Mt. Holly WRF site so that the WRF could be decommissioned. Additionally, access roads and power transmission would be constructed to the regional facility location. Table 3 (below) summarizes regulatory authority, impact type, Nationwide Permit (NWP) number, and impact amount. Phase 1a requires authorization under Section 10 and NWP 12 for HDD installation of forcemains beneath the Catawba River and between the existing Long Creek PS and Mt. Holly Water Reclamation Facility (WRF). Phase 1b requires authorization under NWP 14 for access road construction. PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 4 Table 3. Proposed Phase 1 Impacts Impact Number Feature Type1 Figure/ Plansheet Regulatory Authority Impact Type NWP No. Phase Total (ac) 1 Wetland 10 (PEM) Figure 6/ Plansheet 1 Section 404 Grading and Fill 12 1a 0.04 2 Catawba River Figure 5/ Plansheet 2 Section 10/404 HDD beneath Catawba River 12 1a n/a 3 Wetland 5 (PEM) Figure 7/ Plansheet 3 Section 404 Fill 14 1b 0.01 4 Wetland 6 (PEM) Figure 7/ Plansheet 3 Section 404 Fill 14 1b 0.04 5 Wetland 8 (PFO) Figure 8/ Plansheet 4 Non-Section 404- Isolated Fill n/a* 1b 0.04 6 Wetland 12 (PFO) Figure 9/ Plansheet 5 Section 404 Fill 14 1b 0.11 Total Section 10/404 Stream Impacts: n/a Total Section 404 Wetland Impacts: 0.20 ac Total Non-Section 404 Isolated Wetland Impacts: 0.04 ac A nationwide permit is not required for non-section 404 isolated waters 1Cowardin Classifications: PEM = Palustrine emergent wetland; PFO = Palustrine forested wetland Phase 1a: Mt. Holly Forcemains and Stowe Site Preparation (Section 10 and NWP No. 12) · Includes site preparation for the horizontal directional drill (HDD) of forcemains between existing Charlotte Water Long Creek Pumping Station (PS) to the existing City of Mount Holly WRF. · The purpose of the forcemains will be to transfer wastewater from the existing Mount Holly WRF to a new pump station to be constructed adjacent to the existing Long Creek PS. Once the Stowe RWRRF is operational (Phase 2a), it will treat the wastewater from Mt. Holly WRF.  This would result in 0.04 acre of impact to Section 404 Wetland 10 as site grading would be required for the future odor control facility pad associated with Stowe Headworks & Influent Pumping Station (Stowe HW&IPS) in Phase 1c (Figure 6, Plansheet 1, Appendix E).  This would result in a Section 10 impact due to HDD of forcemains beneath the Catawba River with no acreage or linear footage loss of jurisdictional surface waters (Figure 5 and Plansheet 2, Appendix E). Forcemains beneath Long Creek would also be installed by HDD methods, resulting in no surface water impacts. Two parallel 24-inch high density polyethylene (HDPE) forcemains will be provided from Mount Holly WRF to the existing Long Creek PS site, where they will discharge into the existing Long Creek interceptor. The dual 24-inch forcemains will be installed by horizontal directional drill (HDD) with each main installed in a single drill from the existing Long Creek Pumping Station site to the Mt. Holly WRF. One forcemain will serve as the duty main with the second functioning as a redundant standby main. Additionally, a 4-inch fiber optic conduit line will be included in PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 5 each 24-inch main HDD to allow for more reliable communications and control between the receiving facilities and a future Mount Holly Pumping Station (PS), which will be brought online in Phase 1c. The 24-inch main HDDs will extend from the Mount Holly WRF to the connection point with the Long Creek Interceptor, just north of the Long Creek Pump Station. The dual 24-inch mains HDD are 2,900-ft long and will cross under the Catawba River and Long Creek. Both the entry and exit points for the forcemains will be in uplands and beyond the FERC/Duke Energy management boundary. A 60-ft wide easement is requested along this alignment across the Catawba River and Long Creek to encompass both forcemains. No impacts to WoUS are proposed; however, because the Catawba River is a traditionally navigable waterway, NWP 12 authorization is required, along with a Section 10 review for hazards to navigation. No changes or structures are proposed for the water surface, water column, or riverbed; as such, no hazards to navigation are anticipated. The forcemain alignment, HDD entry and exit points, proposed easement boundaries, and piping profile are shown on Plansheet 2 (Appendix E). In preparation for pipe stringing necessary for HDD, clearing and grading will be required for the pipe stringing laydown areas, which would impact 0.04 acres of Wetland 10 (Plansheet 1, Appendix E) This impact would also be necessary for the Stowe Headworks Improvement for the fill slopes necessary to prepare the location of the odor control facility (Phase 1c). As a result of this fill, 0.04 acres of Wetland 10 will be permanently impacted. Site preparation will involve typical construction equipment such as excavators, earthmovers, and bulldozers. Phase 1b: Stowe RWRRF Access Roads (NWP No. 14) · Construction of access roads to the Stowe RWRRF (Phase 2a) site. · Two bridges spanning Long Creek will also be built; however, no impacts to streams will occur.  This would result in 0.16 acre of impacts to Section 404 Wetlands 5, 6, (Figure 7 and Plansheet 3, Appendix E), and 12 (Figure 8 and Plansheet 5, Appendix E), and 0.04 acres of Non-Section 404 Isolated Wetland 8 (Figure 8, Plansheet 4, Appendix E). Access roads will be constructed during this phase, as well as two separate bridges, crossing Long Creek in the north from Belmeade Drive and in the south from Hawfield Road off of Whitewater Center Parkway (Figure 5, Appendix E). Due to frequent public events associated with the Whitewater Center, traffic on Whitewater Center Parkway would restrict both routine and emergency access to the facility via Hawfield Road. Therefore, the main entrance will be located off of Belmeade Road (northern road/entrance) which will remain unaffected by events and traffic at the National Whitewater Center. The second (southern) bridge will provide for a critical connection between treatment facilities located on both sites of Long Creek and provides a secondary entrance from Hawfield Road (southern road/entrance). Two roads and two bridges are necessary for ingress and egress, and safety and security purposes. PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 6 These bridges will be spans with concrete support structures placed beyond top of bank of Long Creek. The support structures for these bridges will be pile driven. The bridge approaches will be constructed first so that the pile driving can occur in uplands. A crane will be utilized to lift and place spans in place without impact to Long Creek. The bridge crossing in the north will be aligned with a previous NC Department of Transportation (NCDOT) abandoned roadway (Old Blacksnake Road) to minimize land disturbance and impacts. Equipment used in the construction will involve cranes, excavators, earthmovers, and bulldozers. Portions of Section 404 Wetlands 5, 6, and 12 will be filled for bridge approaches and pilings. Impacts to Long Creek will be avoided. Additionally, there is an impact to a Non-Section 404, isolated wetland as a result the northern road alignment (Wetland 8) (Figure 8 and Plansheet 4, Appendix E). Phase 1c: Stowe Headworks & Influent Pumping Station and Mount Holly Pumping Station · The purpose of the Stowe HW&IPS will be to provide preliminary wastewater treatment and would eventually send flows to the future Stowe RWRRF (Phase 2a), once operational. · A new pumping station would be constructed at the existing Mount Holly WRF in order to send wastewater flow to the Stowe HW&IPS. The existing Mount Holly WRF would be decommissioned (in a separate project by Mount Holly) upon completion of the Stowe RWRRF (Phase 2a). · No additional impacts to jurisdictional features are expected. · A Duke transmission line is proposed to be constructed to provide power services to the future Stowe RWRRF (Phase 2a). • No impacts to jurisdictional features are expected. There are existing equalization basins at Long Creek PS adjacent to Hawfield Road on the Mecklenburg County side of the Catawba River. A new wastewater treatment plant facility will be constructed in Phase 2 of this project on a portion of land between the Catawba River and Long Creek (Figure 3, Appendix E). In order to support this proposed wastewater plant, which would require storing excess influent during large storm events and to equalize flow to the plant, the existing basins will need to be expanded and support facilities added. This will be referred to as the Stowe Headworks & Influent Pumping Station (Stowe HW&IPS). These improvements must be made prior to Phase 2 as they are part of the critical path for operations. In addition to new and expanded equalization basins, an odor control facility would be included to limit impacts to nearby recreational, public, and private facilities. This expanded footprint will require grading and filling areas which would be conducted previously during Phase 1a. As such no impacts to jurisdictional features are proposed for Phase 1c. PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 7 B4d. Jurisdictional Determinations An Approved Jurisdictional Determination (AJD) request was submitted by HDR to the United States Army Corps of Engineers (USACE) on October 11th, 2019 for the Mecklenburg County side of the Project to include the Stowe Headworks and Influent Pumping Station, Stowe Storm Flow Equalization, the RWRRF, and access road property. The USACE conducted a field verification of on-site WoUS on November 22nd, 2019. Subsequently, CWS investigated the Mt. Holly side of the project in December 2019 and in March 2019 and determined that no WoUS were present, with the exception of the Catawba River which forms the western boundary of the Mt. Holly side. Details of the Mt. Holly side field review conducted by CWS have been submitted by HDR as an amendment to the AJD on March 19th, 2020. The proposed Phase 2b has not yet been put to procurement by the Applicant and a design consultant has not been chosen; therefore, the forcemain alignment from the Belmont WWTP to the Paw Creek PS had not been ground-truthed for WoUS; however, the preliminary alignment follows existing roads through developed land from the Belmont WWTP to an existing railroad, and then follows the railroad until reaching the Paw Creek PS. This Phase 2b is anticipated to have a Section 10 crossing beneath the Catawba River via HDD methods (Figure 4, Appendix E). If any streams or wetlands encountered along this alignment, the Applicant would cross via HDD methods. B6b. Future Project Plans This permit application seeks authorization for Phase 1 (as described in Section B3e). Phases 2-3 are still in the planning stages and proposed impacts to WoUS for these future phases will be considered cumulatively. Phase 2 would result in a Section 10 impact and loss of surface waters of <0.1 acre to the Catawba River associated with an effluent outfall and dock (Table 4). The design, location, and exact impacts are unknown at this time. Additionally, there is an impact to a non-Section 404, isolated wetland (Wetland 9) as a result the Stowe RWRRF construction (Figure 10, Appendix E). The following is a brief description of the remaining phasing of the project. Phase 1 was described in detail in Section B3e. Table 4. Proposed Phase 2 Impacts Impact Number Feature Type1 Figure Regulatory Authority Impact Type Total (ac) 7 Wetland 9 (PFO) Figure 10 Non-Section 404 – Isolated Fill 0.18 8 Catawba River Figure 10 Section 10/404 Effluent Outfall and Dock <0.10* 9 Catawba River Figure 4 Section 10/404 HDD beneath Catawba River n/a Total Section 10/404 Stream Impacts: <0.10 ac* Total Section 404 Wetland Impacts: n/a Total Non-Section 404 Wetland Impacts: 0.18 ac *estimated surface water acreage on the Catawba River 1Cowardin Classification: PFO = Palustrine forested wetland PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 8 Phase 2 (Future) Phase 2a: Stowe Regional Water Resource Recovery Facility (Section 10 and NWP No. 12) In Phase 2a, the regional facility would be constructed and flows from the Stowe HW&IPS would be rerouted to the regional facility (instead of continuing on to the Paw Creek PS) (Figure 3, Appendix E). In Phase 2b, a new pumping station at the existing Belmont WWTP would be constructed to convey wastewater flows through a new forcemain potentially aligned with an existing railroad right of way, crossing beneath the Catawba River, to the existing Paw Creek PS (Figure 4, Appendix E). Flows from the Paw Creek PS would continue to be pumped either to the existing McAlpine Creek Wastewater Management Facility (WWMF) or the Irwin WWTP via existing forcemains. · The Stowe RWRRF is proposed to be a 15 million gallons per day (mgd) WWTP facility that would treat wastewater flows from Charlotte Water and City of Mount Holly.  The Stowe RWRRF facility would result in 0.18 acre of Non-Section 404 isolated Wetland 9 (Figure 10, Appendix E).  The Stowe RWRRF effluent outfall and access dock would result in Section 10 impacts to the Catawba River, estimated to be less than 0.1 acre of surface water impact (Figure 10, Appendix E). • At the time of design, avoidance to Section 404 wetlands will be considered Phase 2b: Belmont Pumping Station and Forcemains (Section 10) · Additional HDDs are proposed beneath the Catawba River to send wastewater flows from the existing Belmont Wastewater Treatment Plant to the existing Paw Creek PS (Phase 2b). · The PS and forcemain would send wastewater flow to Charlotte Water’s existing Paw Creek PS. · Belmont WWTP would likely be decommissioned (in separate project by City of Belmont) upon completion of the PS and Forcemains.  This would result in a Section 10 impact due to HDD of forcemains beneath the Catawba River with no acreage or linear footage loss of jurisdictional surface waters.  The preliminary forcemain alignment between the Belmont WWTP and the Paw Creek PS is anticipated to be installed via HDD methods beneath any streams or wetlands (Figure 4, Appendix E). PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 9 Phase 3 (Future) Phase 3: Stowe RWRRF Expansion In Phase 3, the 15 mgd treatment capacity of the regional facility would be expanded to a future 25 mgd treatment capacity and flows from the Paw Creek PS would be rerouted to the Long Creek PS and on to the regional facility. · Expand the existing Stowe RWRRF (proposed to be built in Phase 2a) to 25 MGD to meet the growing population needs. · No impacts to WoUS anticipated D1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project. To avoid and minimize impacts to waters of the U.S., the project area was delineated for jurisdictional streams and wetlands. Because the Catawba River is a Traditionally Navigable Waterway (TNW), Section 10 authorization is required for any impacts beneath, through, on, or over the river. For those impacts to the Catawba River that propose forcemain installation by HDD, no changes or structures are proposed for the water surface, water column, or riverbed so no hazards to navigation are anticipated. For those impacts to the Catawba River proposed on the surface of the river, design has not yet commenced. Any element of this project that would require future impacts in Phase 2-3, refined designed and calculated impacts would be submitted to the USACE prior to construction. The EIS and approved ROD already considered alternatives for the overall Stowe RWRRF project, location, and HDD methods verses other wastewater treatment options. Impacts associated with the Stowe HW&IPS (Impact 1) cannot be avoided due to the existing location of the Long Creek PS. Impacts associated with the Stowe RWRRF are isolated and not regulated by the USACE (Impact 7) or are in a future phase (dock and effluent outfall) (Impact 8). As such, the alternatives considered here are associated with the road access alignments (Impacts 3, 4 and 6). Impacts 2 and 9, and are Section 10 impacts to the Catawba River, but do not propose surface water impacts. No-Build Alternative The No-Build Alternative would not involve the construction of a new regional treatment facility; however, it would include upgrading the existing Mt. Holly WRF and Belmont WWTP. It would also require substantial wastewater collection system upgrades to the Charlotte Water system. In the absence of the project, capacity for wastewater treatment would be inadequate in providing these services for the existing and anticipated population. The No-Build Alternative would not meet the purpose and need of the project. PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 10 Access Roads Alternatives Analysis The main access to the future Stowe RWRRF will be the northern road alignment via Belmeade Drive (Figure 3, Appendix E). Originally, the southern access road (Hawfield Road) was approved in the ROD; however, traffic on Whitewater Center Parkway (the only connection to Hawfield Road) can be severely backed up with no movement during public and private events at the National Whitewater Center. If there were an emergency at the facility, first responders could not adequately access the facility. Therefore, the main entrance from the north will be a dedicated facility access and a secondary road from the south operational access between facilities and for ingress/egress options are necessary. The first consideration for a secondary access road was the existing entrance and roads on the adjacent Clariant site. The Clariant entrance is located at the intersection of Belmeade Road and Mt. Holly Road. This option proposed no impacts on the western side of Long Creek as it would only utilize existing roads. However, the existing entrance to Clariant would require a crossing of two railroad tracks and any blockage at the entrance gate would result in stopped traffic on an active railroad track. Furthermore, the utilization of Clariant roads for construction and operational vehicles of the Stowe RWRRF would directly interfere with commercial operations at Clariant. As access directly through the Clariant site was eliminated as a feasible northern option, a road alignment from Belmeade Drive to the site was considered. This would follow a previously abandoned NCDOT road footprint that still exhibits old asphalt. The northern road alignment was deemed to be the most feasible, both economically and environmentally. The southern alignment will connect the future Stowe RWRRF to existing Hawfield Road and Long Creek PS. The northern road alignment utilizes an old road footprint, thus minimizing land disturbance and impacts outside of that footprint. Both roads cross Long Creek at narrow spans to avoid and minimize impacts to Long Creek itself. D1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques. Erosion and sedimentation control measures will be properly installed and inspected in accordance with a NPDES Erosion and Sedimentation Control (ESC) permit. Erosion and sedimentation BMPs will be installed prior to construction. Impacts will be minimized by strict enforcement of Best Management Practices for the protection of surface waters, including restrictions against the staging of equipment in or adjacent to waters of the US. Piling drive techniques will be utilized for bridge construction to minimize the impact footprint of the bridge bents. This project will follow all conditions of NWP 12 and NWP 14, including their respective Water Quality General Certifications (WGC) 4133 and 4135. Equipment to be used includes excavators, dump trucks, earthmovers, cranes, and HDD equipment. PCN Supplemental Information Stowe RWRRF & Associated Infrastructure Projects SAW-2019-01988 11 D4h. Complete if using a mitigation bank, comments. Approximately 32.44 acres of wetlands with 13,249 linear feet of stream were identified on site. According to site design, 0.20 acres of jurisdictional wetlands will be impacted. These impacts are proposed to be mitigated as a 2:1 ratio which amounts to mitigating the equivalent of 0.40 acres. Mitigation banks require rounding up to the nearest 0.25 acre, as such 0.5 acres of wetland credits will be purchased from the City of Charlotte Umbrella Stream and Wetland Mitigation Bank. A Credit Acceptance Letter from the Umbrella Stream and Wetland Mitigation Bank is attached (Appendix F). No mitigation is required for impacts to the non-Section 404, isolated wetland impacts (0.22 acre). F5. Endangered Species and Designated Critical Habitat The 2015 EIS examined potential impacts to federal and state protected species. The Preferred Alternative (this Project) was determined to have no impacts to federal and state protected species. However, the EIS did indicate a population of Schweinitz’s sunflower adjacent to, but outside, the Project on the Mt. Holly side and the population was confirmed during a survey conducted on November 19th, 2019 by CWS. HDR surveyed the Mecklenburg County side of the project over several days during the survey window for Schweinitz’s sunflower. HDR determined that there were no suitable habitat present on the Mecklenburg County side. Measures will be put in place, such as extra erosion control fencing and orange tree protection fencing within the project area to protect the population outside the project area; no direct or indirect impacts to this population are anticipated. Therefore, no impacts to federal or state protected species are anticipated. Details of these surveys can be found in Appendix G.