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HomeMy WebLinkAboutSW8060608_Historical File_20180112Energy, Mineral & Land Resources ENVIRONMENTAL QUALITY January 12, 2018 Ms. Erin Acton, Assistant .REDUS NC Coastal, LLC 1 Independent Drive, 1 Oth Jacksonville, FL 32202 Vice President Floor ROY COOPER Governor MICHAEL S. REGAN secretary TRACY DAVIS Director Subject: Approved Minor Modification & Notice of Transfer Application Acceptance The Villages at Turtle Creek Phases I and H Stormwater Permit No. SW8 060608 Pender County Dear Ms. Acton: A minor modification has been approved and an application to transfer the permit has been accepted. Approved Minor Modification: On October 23, 2017, the Wilmington Regional Office of the Division of Energy, Mineral and Land Resources received a complete minor modification application for changes to the approved plans for Stormwater Management Permit Number SW8 060608. It has been determined that the nature of the proposed change meets the definition of a minor modification in that it does not result in an increase in the size of the permitted stormwater control measure (SCM) and does not increase the amount of built - upon area. The minor modification was issued on January 12, 2018. The Wilmington Regional Office issued the subject project a permit on January 10, 2047 and has been made aware that the design calculations contained an error. As documented in the January 10, 2017 cover letter, this permit has a long history. The original infiltration basin for drainage area 1B failed, and had to be replaced with a wet pond. The project was originally designed for SA requirements under 15A NCAC 02H .1005, effective September 1, 1995, with a 1.5" design storm. The wet pond was required to be designed under the 2008 version of the rule which had a larger design storm. However, the volume required under the 2008 rule would not fit into the available space given the location of the nearby wetlands and the adjacent homes that had already been constructed. During construction, contractors discovered that there were errors in the calculations of the storage volume and forebay volume to be provided as detailed in the construction plans. There was approximately a 5% error in defining the surface area of the permanent pool and temporary pool contours. As a result, the permitted volume could"not be contained in the pond. Additionally, a calculation in the forebay data resulted in the forebay being smaller than was expected when the permit was issued in January 2017. The overall footprint of the pond defined in the construction plans is correct and therefore The Division permitted the largest pond that could be built in the location. This correction documents the correct design data, and lowers the permanent pool elevation. Wet Permit 1/10/17 Pond 113 Modification 1/12/18 Elevation, Permanent Pool, fmsl: 22.91 22.75 Elevation, Temporary Fool, fmsl: 25.40 25.00 Area, Perm Pool, ft2: 17,497 15,902 Area, Temp. Pool, ft2: 24,093 21,866 Volume Provided (Temp Pool), ft3: 51,780 42,647 Volume Provided Foreba , ft3: 16,888 3,632 State of North Carolina I Environmental Quality I Energy, Mineral and Land -Resources Wilmington Regional Office 1 127 cardinal Drive Extension I Wilmington, NC 28405 910 796 7215 State Stormwater Permit' SW8 060608 Page 2 of 2 SEPI Engineering and Construction has issued revised drawings indicating the as -built conditions and a revised permanent: pool elevation. This minor modification documents the correct design data, and lowers the permanent pool elevation and provides a temporary pool volume that meets the permitted value. The - design engineer felt that the new permanent pool elevation was appropriate in relation to the nearby wetland elevations. The resultant. temporary pool volume has increased. Notice of Transfer Application. Acceptance: The application to transfer the permit to the HOA that was submitted with the mirror modification package will be accepted on January 16, 2018. This project is subject to the conditions and limitations as specified in the corrected permit. Please pay special attention to the conditions listed in this permit regarding the Operation and Maintenance of the BMP(s), recordation of deed restrictions, certification of the project, procedures for changes of ownership, transferring the permit, and renewing the permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system, to record deed restrictions, to transfer the permit, or to renew the permit, will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150B of the North Carolina General Statutes, and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. If you have any questions, need additional copies of the permit or approved plans, please contact Kelly Johnson with DEMLR in the Wilmington Regional Office at (910) 796-7215. S in 4111,William E. (Toby) Vinson, Jr., PE, CPESC, CPM, Interim Director Division of Energy, Mineral and Land Resources GDS/kpj: \\\Stormwater\Permits & Projects\060608\060608 HD\2018 01 permit minor 060608 enc: Attachment A: Wet Pond Certification Form Attachment B: Infiltration Basin Certification Form Attachment C: Permit History cc: Greg Thompson, PE, SEPI Engineering Inspector, Pender County Building Inspections Wilmington Regional Office Stormwater File State of North Carolina I Environmental Quality I Energy, Mineral and Land Resources Wilmington Regional Office 1 127 Cardinal Drive Extension I Wilmington, NC 28405 910 796 721S State Stormwater Management Systems Permit No. SW8 060608 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL AND LAND RESOURCES STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO REDUS NC Coastal, LLC The Villages at Turtle Creek Phases 1 and 11 NC 210 & Lodge Hall Rd, Surf City - Pender County FOR THE construction, operation and maintenance of six (6) infiltration basins in compliance with the provisions of 15A NCAC 2H .1,000, effective September 1,1995 and one (1) wet pond in compliance with the alternative design criteria provisions of 15A NCAC 2H .1008(h), effective September 1, 1995 (hereafter referred to as the "stormwa ter rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Energy, Mineral and Land Resources (DEMLR) and considered a part of this permit. This permit shall be effective from the date of issuance until July 20, 2020, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. State Stormwater Management Systems Permit No. SW8 060608 2. This stormwater system has been approved for the management of stormwater runoff as described in Sections 1.6 &1.7 of this permit. The subdivision is permitted for 71 lots, each allowed the maximum amount of built -upon area specified in Section 11.16 of this permit. The stormwater systems have been designed to handle the following amounts of impervious area: 1A-1 11,025 1A-2 6,875 1A-3 2,361 1B 339,953 10 137,639 1D-1 21,851 1D-2 46,652 ft2 ft2 ft2 ft2 ft2 ft2 ft2 'Must be operated with a vegetated filter. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 4. The runoff from all built -upon area within each permitted drainage area of this project must be directed into the permitted stormwater control system. S All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. State Stormwater Management Systems Permit No. SW8 060608 6. The following design criteria have been permitted for the wet detention pond and it must be provided and maintained at the design condition. No impervious area is available for future allocation in the wet pond's drainage area. Wet Pond 1 B a. Drainage Area, acres: Onsite, ft2: Offsite, ft2-0 17.27 752 249 b. Total Impervious Surfaces; ft2: Onsite, ft2: Offsite, ft2: 339,953 339,953 0 c. Average Pond Design Depth, feet: 3.7 d. TSS Removal Efficiency: 90% e. Design Storm, inches: 1.50 f. Permanent Pool (PP) Elevation, FMSL: 22.75 g. Permitted PP Surface Area, ft2: 16,509 h. Temporary Storage Elevation, FMSL: 25.00 i. Permitted Storage Volume, ft3: 52,493 j. Predevclopment 1 yr-24 hr. discharge rate, cfs: 35.10 k. Controlling Orifice, inch 0 pipe: 3.00 I. Orifice Flow Rate, cfs: 0.24 M. PP Volume, ft3: 58,827 n. Forebay Volume, ft3: 3,632 o. Maximum Fountain Horsepower: 1/6 p. Receiving Stream/River Basin: Becky's Creek q. Stream Index Number: 18-87-8 r. Classification of Water Body: SA State Stormwater Management Systems Permit No. SW8 060608 7. The following design elements have been permitted for the infiltration basin stormwater facilities, and must be provided in the system at all times. units Basin 1A 1 Basin 1A-2 Basin 1A-3 Basin 10 Basin 10-1 Basin 1D-2 Drainage Area Onsite Offske fe 29.988 2.9,988 0 16,454 16,454 0 7,072 7,072 0 283,381 283,381 0 Y 38,304 38,304 0 80,666 80,666 0 Total BUA Lot BUA RoadstParking Sidewalks Other _Oflsite Future Allocation Available fie 11,025 0 8,876 2,149 0 0 0 6,75 0 5,238 1,637 0 0 0 2,361 0 1,697 664 0 0 0 137,639 84,875 36,273 11,809 4,682 0 0 21,851 1,066 16,068 3,637 0 0 1,080 46,652 12,382 24,043 6,385 0 0 3,842 Basin Depth Feet 0.75 1.25 1 1.25 2.25 2.25 2.05 Design Storm Inches 4.5 4.5 4.5 1.5 4.5 4.6 SHWT FMSL 29 28 28 10 24 23.7 Bottom Elevation FMSL 31 30 30 12 27 25.7 Surface Area @Bottom ft2 6,025 2,208 1,085 9,377 2,790 6,534 Storage Volume ft3 4,879 . 3,331 1,757 26,859 1 9,450 17,335 Storage/Bypass Elevation FMSL 31.75 31,25 31.25 14.25 29.25 27.75 Expected Infiltration Rate in/hr 0.52 0.52 0.52 3 2.6 2.6 Time to Draw Down Hours 16 28 20 7 13 12 Type of Soil yp woodington Fine Sandy Loam Onslow Sandy Loam Receiving Stream Becky's Creek River Basin Cape Fear Stream Index Number 18-87-8 Classification of Water Body "SA;HQw" II. SCHEDULE OF COMPLIANCE No homeowner/lot owner/developer shall fill in, alter, or pipe any drainage feature (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the permit and receiving approval from the Division. 2. The permittee is responsible for verifying that the proposed built -upon area for the entire lot, including driveways and sidewalks, does not exceed the allowable built - upon area. Once the lot transfer is complete, the built -upon area may not be revised without approval from the DEMLR, and responsibility for meeting the built - upon area limit is transferred to the individual property owner. 3. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. State Stormwater Management Systems Permit No. SW8 060608 4. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. The bioretention area may not be used as a sediment and erosion control device once the planting soil has been placed. 5. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 6. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to the approved plans, regardless of size. b. Project name change. c. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area. e. Further subdivision, acquisition, or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. g. The construction of permeable pavement for BUA credit. 7 The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 8. The Director may determine that other revisions to the project should require a modification to the permit. 9. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. 10. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 11. Permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 12. Prior transfer of the permit, the stormwater facilities will be inspected by DEMLR personnel. The facility must be in compliance with all permit conditions. Any items not in compliance must be repaired or replaced to design condition prior to the transfer. Records of maintenance activities performed to date will be required. State Stormwater Management Systems Permit No. SW8 060608 13. The permittee shall at all times provide the operation and maintenance necessary to assure that all components of the permitted stormwater system function at optimum efficiency_ The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of side slopes. d. Immediate repair of eroded areas. e. Maintenance of side slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of structures, orifice, catch basins and piping_ g. Access to all components of the system must be available at all times. 14. Records of maintenance activities must be kept and made available upon request to authorized personnel of DEMLR. The records will indicate the date, activity, name of person performing the work and what actions were taken. 15. Decorative spray fountains are allowed in the pond, subject to the following criteria- h. The minimum permanent pool volume is 30,000 cubic feet. i. The fountain must draw its water from less than 2' below the permanent pool surface. j. Separated units, where the nozzle, pump and intake are connected by tubing, may be used only if they draw water from the surface in the deepest part of the pond. k. The fountain may not be placed into the forebay. I. The falling water from the fountain must be centered in the main pond, away from the shoreline. M. The maximum horsepower for a fountain in this pond is 1/3 horsepower. 16. Prior to the sale of any lot, the following deed restrictions must be recorded: a. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number SW8 060608, as issued by the DEMLR under NCAC 2H.1000. b. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the Stormwater Management Permit. C. These covenants are to run with the land and be binding on all persons and parties claiming under them. d. The covenants pertaining to stormwater may not be altered or rescinded without the express written consent of the State of North Carolina, DEMLR. e. Alteration of the drainage as shown on the approved plans may not take place without the concurrence of the DEMLR. State Stormwater Management Systems Permit No. SW8 060608 The maximum built -upon area per lot is as summarized in the table below. This allotted amount includes any built -upon area constructed within the lot property boundaries, and that portion of the right of way between the front lot line and the edge of the pavement. Built upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. Lots 1-24 and 27-45 are recorded in BK3290/PG193. Lots 46-73 are recorded in BK4000/PG0272. i Lot # Max BUA Lot # _ Max ! BUA Lot # Max BUA Lot # Max. BUA Lot # Max. BUA 1 41152 16 3,731 31 3,659 46 4,176 61 4,187 2 4,152 17 3,695 32 3,633 47 4,165 62 4,189 3 4,152 18 3,676 33 3,602 48 4,149 63 4,187 4 4,152 19 4,211 34 3,601 49 4,226 64 4,195 5 4,300 20 4,269 35 3,599 50 4,145 65 4,187 6 4,186 21 4,350 36 4,151 51 4,152 66 4,187 7 3,668 22 4,161 37 4,480 52 4,151 67 4,187 8 3,608 23 4,165 38 3,849 53 4,151 68 4,187 9 3,607 24 4,162 39 3,828 54 4,151 69 4,183 10 3,607 25 40 4,022 55 4,147 70 4,186 11 3517 26 41 4,255 56 4166 71 4,186 12 4,156 27 3,681 42 4,087 57 4,165 72 4,232 13 3,692 28 3,672 43 3,829 58 4,213 73 4,289 14 3,776 29 3,668 44 4,128 59 4,253 15 3,691 30 3,664 45 4,425 60 4,189 g. All runoff on the lot must drain into the permitted system. This may be accomplished through providing roof drain � gutters which drain to the street, grading the lot to drain toward the street, or grading perimeter swales and directing them into the pond or street. Lots that will naturally drain into the system are not required to provide these measures. h. Built -upon area in excess of the permitted amount will require a permit modification. 16. A copy of the recorded deed restrictions must be submitted to the Division within 30 days of the date of recording the plat, and prior to selling lots. The recorded copy must contain all of the statements above, the signature of the Permittee, the deed book number and page, and the stamp/signature of the Register of Deeds. 17. The facilities shall be constructed, operated and maintained in accordance with the provisions of this permit, the approved plans and specifications, and the supporting documents attached to this permit and on file with the Division. 18. Built upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. 6 State Stormwater Management Systems Permit No. SW8 060608 III. GENERAL CONDITIONS This permit is not transferable to any person or entity except after notice to and approval by the Director. The permittee shall submit a completed and signed Name/Ownership Change Form, accompanied by the supporting documentation as listed on the form, to the Division of Energy, Mineral and Land Resources at least 60 days prior to any one or more of the following events: a. An ownership change including the sale or conveyance of the project area in whole or in part, except in the case of an individual lot sale that is made subject to the recorded deed restrictions; b. The sale or conveyance of the common areas to a Homeowner's or Propertyy Owner's Association, subject to the requirements of Session Law 2011-256; c. Bankruptcy; d. Foreclosure, subject to the requirements of Session Law 2013-121 e. Dissolution of the partnership or corporate entity, subject to NCGS 57D-2- 01(e) and NCGS 57D-6-07; f. A name change of the current permittee; gg A name change of the project; h. A mailing address change of the permittee; 2. The permittee is responsible for compliance with all of the terms and conditions of this permit until such time as the Director approves the transfer request. 3. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the DEMLR, in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. 4. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) that have jurisdiction. 5. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 7. Permittee grants permission to staff of the DEMLR to access the property for the purposes of inspecting the stormwater facilities during normal business hours. 8. The permittee shall notify the Division in writing of any name, ownership or mailing address changes within 30 days. 9. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. 10. Any individual or entity found to be in noncompliance with the provisions of this stormwater management permit or the requirements of the Stormwater rules is subject to enforcement procedures as set forth in NCGS 143 Article 21. 10 State Stormwater Management Systems Permit No. SW8 060608 11. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. Neither the sale of the project, in whole or in part, nor the conveyance of common area to a third party constitutes an approved transfer of the stormwater permit. 12. If the use of permeable pavement for BUA credit within the lot is desired, the permittee shall direct the lot owner to submit an application with all supporting documentation and the application fee to the Division and receive a permit prior to construction of the permeable pavement. 13. The permittee shall submit a permit renewal application request at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate documentation and the processing fee. Permit modified and re -issued this the 12th day of January 2018 NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION William ob y insonJr., , Interim Director Division of Energy ineral and Land Resources By Authority of the Environmental Management Commission 11 State Stormwater Management Systems Permit No. SW8 060608 Attachment A: Wet Pond Certifications The Villages at Turtle Creek Phases I and II Page 1 of 2 Stormwater Permit No. SW8 060608 Pender County Designer's Certification: Wet Pond I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is a part of this Certification. Noted deviations from approved plans and specifications: Signature _ Registration Number Date SEAL 12 State Stormwater Management Systems Permit No. SW8 060608 Certification Requirements: Wet Pond Page 2 of 2 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The outlet/bypass structure elevations are per the approved plan. 6. The outlet structure is located per the approved plans. 7. Trash rack is provided on the outlet/bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short- circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. Required drawdown devices are correctly sized per the approved plans. 13. All required design depths are provided. 14. All required parts of the system are provided, such as a vegetated shelf, a forebay, and the vegetated filter. 15. The required dimensions of the system are provided, per the approved plan. 16. All components of the stormwater BMP are located in either recorded common areas, or recorded easements. cc: NCDEQ-DEMLR Regional Office Inspector, Town of Surf City Building Inspections Inspector, Pender County Planning 13 State Stormwater Management Systems Permit No. SW8 060608 Attachment B: Infiltration Basin Certifications The Villages at Turtle Creek Phases I and 11 Page 1 of 2 Stormwater Permit No. SW8 060608 Pender County Designer's Certification: Infiltration Basins I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature _ Registration Number Date SEAL 14 ri Certification Requirements: Infiltration Basin State Stormwater Management Systems Permit No. SW8 060608 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The bypass structure weir elevation is per the approved plan. 6. The bypass structure is located per the approved plans. .. 7. A Trash Rack is provided on the bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short- circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. cc: NCDEQ-DEMLR Regional Office Inspector, Town of Surf City Building Inspections Inspector, Pender County Planning 15 State Stormwater Management Systems E Permit No. SW8 060608 Attachment C: History of Significant Events 1. 7/20/06: Original permit issued to Dilsheimer Communities of North Carolina, LLC. 2. 7/10/07: Permit modification 3. 11/9/07: Permit modification 4. 12/17/07: Plan Revision 5. 7/28/10: The permit was transferred to REDUS NC Coastal, LLC (a bank) after the original permittee was foreclosed on. The property was under a Notice of Violation (NOV) mainly for maintenance issues and for failure to certify the BMPs when the permit was transferred. 6. Fall 2015: The berm of Infiltration Basin 113 blew out, and sediment was discharged into the wetlands. A large volume of soil was removed from the wetlands, and the basin was re -installed per the stormwater permit conditions. However, it became apparent that the original design was not sustainable because the seasonal high-water table (SHWT) used in the original design was incorrect. The SHWT was found to be —2ft above the infiltration basin's inlet pipe, which is approximately 4ft too high for an infiltration basin to function. The Division did an inspection and met with the permittee's engineer to discuss an appropriate path forward. It was determined that a wet pond was the only option. 7. 12/14/16: The property management company contacted the Division with BMP maintenance concerns about an eroding amenity pond behind Leyland Way. Since this feature is an amenity pond as opposed to a pond required by State Stormwater and the issues appear to be the result of flooding, we have forwarded those concerns to the Town of Surf City. 8. 1/10/17: a. Wet Pond: The failed Infiltration Basin I has been modified to Wet Pond IB. Historically, this permit was written under 15A NCAC 02H .1005, effective September 1, 1995 (commonly referred to as the 1995 rule) at 1.5" for shellfish (SA) waters. That regulation was modified per 15A NCAC 02H .1005, effective October 1, 2008 (commonly referred to as the 2008 rule). Best management practices (BMPs) designed under the 2008 rule were required to treat the greater of either the 1.5" storm or the difference in pre/post of the lyr24hr storm, which is typically about 3.8". Therefore, the 2008 rule's required volume is significantly greater than 1995 rule. Additionally, 2008-rule BMPs within a mile of and draining to SA waters cannot discharge to SA waters [per 15A NCAC .1005(a)(1)(C)] without employing additional structural features. The 2008 rule [15A NCAC .1005(h)(5)] also says that BMPs that were permitted under the 1995 rule can be modified under the 1995 rule if they are "minor modifications", which the rule defines as a modification that doesn't add BUA or increase the size of the BMP. Modifying Basin 1B from an infiltration basin to a wet pond therefore triggered coverage under the 2008 rule. However, the design engineer determined that the space required to build a wet pond per the 2008 rule was not available because homes have already been constructed around Basin IB, and there are wetlands on the only available expansion point. The Division therefore determined that installing the largest possible wet pond as an alternative design per 15A NCAC 02H .1008(h) was appropriate. Though 15A NCAC 02H .1000 was revised by the legislature during these discussions (effective 1/1/17), the 1/10/17 permit was given a Prior Authorization per 15A NCAC 02H .1001(5), effective 1/1/17 to be permitted under the 2008 rule in lieu of the 2017 rule because it had been negotiated prior to the 2017 rules' effective date. b. Datum: Please note that the reference datum used in the original design differs from the reference datum in the new design. The old datum is —lft lower. 9. 1/12/18: Permit modification to correct errors in the calculations of the storage volume and forebay volume to the 1/17/17 permit. These errors were discovered during construction. There was approximately a 5% error in defining the surface area of the permanent pool and temporary pool contours. As a result, the permitted volume could not be contained in the pond. Additionally, a calculation in the forebay data resulted in the forebay being smaller than was expected when the permit was issued in January 2017. 10. 1/16/18: A Permit Transfer application to transfer the permit to the HOA was accepted for review. 16 DEMLR USE ONLY Date eceive P ' P :nit Number Applicable es: Coastal SW -1995 12 Coastal SW - 2008 ❑ Ph II - Post Construction (select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan ❑ Other WQ MSmtPlan: State of North Carolina /y11:7D1- Department of Environment and Natural Resources Division of Energy, Mineral and Land Resources STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION 1. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): The Villazes at Turtle Creek Phase I and II 2. Location of Project (street address): NC Hwy 210 and Lodge Hall Road City:Surf City County:Pender Zip:28443 3. Directions to project (from nearest major intersection): From the intersection of US 17 and NC Hwy 210 travel east on NC Hwy 210 for two (2) miles Turn left after Lodge Hall Road. 4. Latitude:340 27 05.84" N Longitude:770 34' 43.74" W of the main entrance to the project. II. PERMIT INFORMATION: 1. a. Specify whether project is (check one): ❑New ®Modification ❑ Renewal w/ Modificationt tRenewals with modifications also requires SWU 102 •- Renewal Application Form b. If this application is being submitted as the result of a modification to an existing permit, list the existing permit numberSW8 060608 , its issue date (if known)11/09/2007 , and the status of construction: []Not Started ❑Partially Completed* N Completed* *provide a designer's certification 2. Specify the type of project (check one): ❑Low Density ®High Density ❑Drains to an Offsite Stormwater System ❑Other 3. If this application is being submitted as the result of a previously returned applicarth!l ' Q� DEMLR requesting a state sormwater management permit application, list the sj cY ;R if assigned, and the previous name of the project, if differentlproposed, 2017 4. a. Additional Project Requirements (check applicable blanks; information on requiredits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑CAMA Major ®Sedimentation/Erosion Control: UNPDES Industrial Stormwater N404/401 Permit: Proposed Impacts ac of Disturbed Area b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number, issue date and the type of each permit:Construction completed in 2007; Modification to infiltration Basin 1B 5. Is the project located within 5 miles of a public airport? NNo ❑Yes If yes, see S.L. 2012-200, Part VI. http://portal.ncdenr.org/web/Ir/rules-and-regulations Form SWU-101 Version Oct. 31, 2013 Page 1 of 6 III. CONTACT INFORMATION 1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee, designated government official, individual, etc. who owns the project): Applicant/Organization:REDUS NC Coastal, LLC Signing Official & Title:Erin Acton / Assistant Vice President b. Contact information for person listed in item 1a above: Street Address:1 Independent Drive,10th Floor CityJacksonville State:FL Zip:32202 Mailing Address (if applicable):1 Independent Drive,10th Floor CityJacksonville State:FL Zip:32202 Phone: (904 ) 351-7346 Fax: (904 ) 351-7367 Eniail:erin.acton®wellsfargo.com c. Please check the appropriate box. The applicant listed above is: ® The property owner (Skip to Contact Information, item 3a) ❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below) ❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and 2b below) ❑ Developer* (Complete Contact Information, item 2a and 2b below.) 2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the person who owns the property that the project is located on): Property Owner/Organization: Signing Official & Title: b. Contact information for person listed in item 2a above: Street Address: City: State: Zip: Mailing Address (if applicable): City: State: Zip: -- Phone: Email: Fax: ( ) 3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other person who can answer questions about the project: Other Contact Person/Organization: Signing Official & b. Contact information for person listed in item 3a above: Mailing Address: City: Phone: ( j Fax: - �'_ �`-.,• a %W A Email: OCT 13 2017 4. Local jurisdiction for building permits: Point of Contact:Steve Padgett Phone #: (910 ) 328-3921 Form SWU-101 Version Oct. 31, 2013 Page 2 of 6 IV. PROJECT INFORMATION 1. In the space provided below, briefly summarize how the stormwater runoff will be treated. Stormwater runfff will be treated by six (6) previously certified infiltration basins This permit modification is only for the Alternate Design conversion of infiltration basin 1-B to a retrofit wetpond All other basins will remain as previously certified and constructed. Basin 1-B needs an alternate design due to elevated SHWT 2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved: ❑ Approval of a Site Specific Development Plan or PUD Approval Date: ❑ Valid Building Permit Issued Date: " Other: Date: b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with: ❑ Coastal SW -1995 ❑ Ph Il - Post Construction 3. Stormwater runoff from this project drains to the Cape Fear River basin. 4. Total Property Area: 27.73 acres 5. Total Coastal Wetlands Area: acres 6. Total Surface Water Area: acres 7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project Area+:27.73 acres + Total project area shall be calculated to exclude the following: the normal pool of impounded structures, the area between the banks of streams and rivers, the area below the Normal High Water (NSW, line or Mean Hi$h Water (MHW) line, and coastal wetlands landward from the NHW (or MHM line. The resultant project area is used to calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line may be included in the total project area. 8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 46.9 % 9. How many drainage areas does the project have?7 (For high density, count 1 for each proposed engineered stormwater BMP. For low density and other projects, use 1 for the whole property area) 10. Complete the following information for each drainage area identified in Project Information item 9. If there are more than four drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. C1A-11 (1A- �1 Basin Information Drainage Area 1 Drains a Area 2 Drainage Area 3 Drainage Area 4 Receiving Stream Name Becky's Creek Becky's Creek See Attached See Attached Stream Class * SA;HWQ SA;HWQ Stream Index Number * 18-87-8 18-87-8 Total Drainage Area (sf) 29,988 16,454 On -site Drainage Area (sf) 29,988 16,454 Off -site Drainage Area (sf) 0 0 Proposed Impervious Area** s 11,025 6,875 % Impervious Area** total 36.8% 41.8% Impervious- Surface Area Drainage Area 1 Drainage Area 2 Drainage Area 3 Drainage Area 4 On -site Buildings/Lots (so 0 0 See Attached See Attached On -site Streets (sf) 8,876 5,238 On -site Parking (sf) 0 0 _ On -site Sidewalks (sf) 2,149 1,637 Other on -site (so 0 0 OCT Future (sf) I I 0 Off -site (sf) 0 Existing BUA*** (so Total (sf): 11,025 6,875 Stream Class and Index Number can be determined at: http.Y&ortal.ncdenr.org/weA/ps/csu/ciassifCcations Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form SWU-101 Version Oct. 31, 2013 Page 3 of 6 D e5 w Y +s 4j rq 4-1 4� +; N LL LL LL LL LL LL 4 U LL N o Lam. LL N 6 LL LL c (6 N O^ 0) N irA m Y u W LLB p Ln Ln L^f] L) r O m [O O c� Ln O a O LD fa 00 '� lA 00 „�" e 1 N -zt Vi I VN ++ ++ a-� a-; i$ a LL LL fa LL ++ LL ++ LL LL U V) LL N O L. 6 LL CT Cf LL LL Ln N 49 O M O Ln Ln tC (n O 00 M V] O cn Ln O 00 C N m N ro Ln 00 LD � Lo L'n N Qcc trl Y a-+ a-+ w } m a a LL LL m v LL LL LL LL LL +; LL LL i2! t L U Q a Ln LL N � LL & LL L) OD M M 00 cn L6 t6 LA N M A LYj L� m 0 0 pip C n V) 00 p N O 00 00 c17 p m M N I� 00 H ri H m -i In co !Q a LPL ILL L• LL LL +' LL LL U L� LL Ln o ,Q V) LL u) LL 41. LL Lnr .� Q °) � N Ln N a �. rn 6 LC) ^ A on m ) M Y N O � C L/•f 0 O m^ ci N 0 In 0 0) N N m co n m -4 00 � m in m N3 99 T M `J LL �+ LL c f0 LL LL LL LL LL U <� C-r LL L7 as Ln Q LL Cr zs L" LL 6 s Q L" {U A N N `� m m Ln Ln n N Ln M y O r p m 0 0 LLO LWo O LO O m N C r N' _ m Q O a f0 a Q m m ++ 4, Ln C z U 7 .o m u o CL OEE o �' „a Y W m- CL a Q c to r cn a m L1 E 4n L[7 LB_ a a t' L q !% L% Q E 3 7 m} •N ". tko A= O0 M 00 N 4? Co m- Ln Ln c o w. > m= In o a a a a � a - L a +_ o L cc of cc 0 Lxu a o 0 0 0 0 0 0 H E'9..lQa PE F .. JAN 12 2U13 t�. BY:-- *** Report only that amount of existing BUA that will remain after development. Do not report any existing BLIA that is to be removed and which will be replaced by new BUA. 11. How was the off -site impervious area listed above determined? Provide documentation. N/A Projects in Union County: Contact DEMLR Central Offece staff to check if the project is located within a Threatened & Endangered Species watershed that may be subject to more stringent stormwater requirements as per 15A NCAC 02B .0600. V. SUPPLEMENT AND O&M FORMS The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded from http://portal.ncdenr.org/web/ wq/ ws/su/bmp-marival. VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application instruction sheet and BMP checklists are available from hM2://Rortal.ncdenr.org/web/wg/­­ws/su/statesw/forms docs. The complete application package should be submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the interactive online map at http:/ /portal.ncdenr.org/web/wq/ws/su/maps.) Please indicate that the following required information have been provided by initialing in the space provided for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for each submitted application package from hft://portal.ncdenr.org/web/wg/­­ws/su/statesw/forms docs. Initials 1. Original and one copy of the Stormwater Management Permit Application Form. WTA- 2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants IV�T- Form. (if required as per Part VII below) 3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M I�rt�r agreement(s) for each BMP. 4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to ho://www.envhel�org/pages/onestol2exj2ress.hbnl for information on the Express program and the associated fees. Contact the appropriate regional office Express Permit Coordinator for additional information and to schedule the required application meeting.) 5. A detailed narrative (one to two pages) describing the stormwater treatment/managementfor MIA — the project. This is required in addition to the brief summary provided in the Project Information, item 1. 6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the TA — receiving stream drains to class SA waters within lh mile of the site boundary, include the ih mile radius on the map. 7. Sealed, signed and dated calculations (one copy). 8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including: a. Development/Project name. b. Engineer and firm. c. Location map with named streets and NCSR numbers. d. Legend. e. North arrow. f. Scale. g. Revision number and dates. E C EFI V E h. Identify all surface waters on the plans by delineating the normal pool elevation impounded structures, the banks of streams and rivers, the MHW or NHW line t "'da®CT 13 2017 W waters, and any coastal wetlands landward of the MHor NHW lines. Delineate the vegetated buffer landward from the normal pool elevation of ' unded structures, the banks of streams or rivers, and the MHW (or NHW) of tidal w . i. Dimensioned property/project boundary with bearings & distances. j. Site Layout with all BUA identified and dimensioned. k. Existing contours, proposed contours, spot elevations, finished floor elevations. 1. Details of roads, drainage features, collection systems, and stormwater control measures. m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a qualified person. Provide documentation of qualifications and identify the person who made the determination on the plans. Form SWU-101 Version Oct. 31, 2013 Page 4 of 6 n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations. o. Drainage areas delineated (included in the main set of plans, not as a separate document). p. Vegetated buffers (where required). 9. Copy of any applicable soils report with the associated SHWT elevations (Please identify N elevations in addition to depths) as well as a map of the boring locations with the existing elevations and boring logs. Include an 8.5"xll" copy of the NRCS County Soils map with the project area clearly delineated. For projects with infiltration BMPs, the report should also include the soil type, expected infiltration rate, and the method of determining the infiltration rate. (Infiltration Devices submitted to WiRO: Schedule a site visit for DEMLR to verify the SHWT prior to submittal, (910) 796-7378.) 10. A copy of the most current property deed. Deed book: 4091 Page No: 0073 (�T� 11. For corporations and limited liability corporations (LLC): Provide documentation from the NC Secretary of State or other official documentation, which supports the titics and positions held by the persons listed in Contact Information, item la, 2a, and/or 3a per 15A NCAC 21-1.1003(e). The corporation or LLC must be listed as an active corporation in good standing with the NC Secretary of State, otherwise the application will be returned. ho://www.secE!LtM.state.nc.us/Corporations/CSearch.aspx VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective covenants are required to be recorded prior to the sale of any lot. I€ lot sizes vary significantly or the proposed BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and protective covenants forms can be downloaded from htip://portal.ncdenr.org/web/lr/state-stormwater- forms docs. Download the latest versions for each submittal. In the instances where the applicant is different than the property owner, it is the responsibility of the property owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring that the deed restrictions are recorded. By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and protective covenants for this project, if required, shall include all the items required in the permit and listed on the forms available on the website, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the NC DEMLR, and that they will be recorded prior to the sale of any lot. VIII. CONSULTANT INFORMATION AND AUTHORIZATION Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as addressing requests for additional information). Consulting Engineer:Greg Thompson, PE Consulting Firm: SEPI Engineering and Construction Mailing Address:5030 New Centre Dr., Suite B City:Wilmington State:NC Zip:28403 Phone: (910 ) 550-3251 Fax: (910 ) 523-5716 Email:gthompson®sepiengineering.com IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this section) I, (print or type name of person listed in Contact Information, item 2a) , certify that I own the property identified in this permit application, and thus give permission to (print or type name of person listed in Contact information, item 1a) with (print or type name of organization listed in Contact Information, item 1a) to develop the project as currently proposed. A copy of the lease agreement or pending property sales contract has been provided with the submittal, which indicates the party responsible for the operation and maintenance of the stormwater system. w, ECEI V E "I Form SWU-101 Version Oct. 31, 2013 Page 5 of 6 BY., As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6. Signature: Date: a Notary Public for the State of . County of do hereby certify that before me this _ day of personally appeared , and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission expires X. APPLICANT'S CERTIFICATION I, (print or hjpe name of person listed in Contact Information, item 1a) Erin M. Acton/AVP of Redus Properties, Inc. certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of the applicable st ater julesunde"A NCAC 2H .1000 and any other applicable state stormwater requirements. Date: I d I0�1 1 I I, ---Kt kn C t a Notary Public for the State of f OM 0, , County of Dow, , , do hereby certify that - Ef i a fku(l personally appeared before me this DI day of o f fiber U 11 , and ac 1 e #h ue exe lion of the application for a stormwater permit. Witness my hand and official seal, Kearsten Cull SEAL Notary Public - State of Florida Commission No. GG 101581 F Commission Expires 05/04/2021 I My commission expires Q 5/0q] d�o oQ ECEIVE OCT 13 2017 Form SWU-101 Version Oct. 31, 2013 Page 6 of 6 Permit No. 4:LR6Co6G6q (m be provided by DWO) _o2prr wnrF,S,QG MSDEM Y STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information. 1:. PROJECT NFOF49ATION . . Project name Turtle Creek Contact person Greg Thompson Phone number 910-523-5715 Date 7117/2017 Drainage area number 4 8. DESM 11111IFORMATM Site Characteristics Drainage area 752,249 (lz Impervious area, post -development 339,953 fe % impervious 45.19 % Design rainfall depth 3.7 in Storage Volume: Non -SA Waters Minimum volume required to Volume provided to Storage Volume: SA Waters 1.5" runoff volume 42,494 i Pre -development 1-yr, 24-hr runoff 7,729 fe Post -development 1-yr, 24-hr runoff 96,943 fO Minimum volume required 69,214 fP Volume provided 52,493 fe Insufficient. Increase volume provided. Peak Flow Calculations Is the Pre/post control of the 1vr 24hr storm peak flow required? N (Y or N) 1-yr, 24-hr rainfall depth 3.7 in Rational C, pre -development 0.25 (unitiess) Rational C, post -development 0.57 (unitiess) Rainfall intensity: 1 -yr, 24-hr storm 0.16 in/hr OK ��� Pre -development 1-yr, 24-hr peak flow 3.97 fts/� G Post -development 1-yr, 24-hr peak flow 25.47 fP/sec JUL 17 2017 Pre/Post 1-yr, 24-hr peak flow control 21.50 fe/sec Elevations Temporary pool elevation 25.40 fmsl BY; -- Permanent pool elevation 22.75 fmsl SHWT elevation (approx. at the perm. pool elevation) 23.41 fmsl Top of 10ft vegetated shelf elevation 23AO fmsl Bottom of 1Oft vegetated shelf elevation 22.40 frnsl Data not needed for calculation option #1, but OK if provided. Sediment cleanout, top elevation (bottom of pond) iF00 final Sediment cleanout, bottom elevation 17,00 imsl Data not needed for calculation option #1, but OK'd provided. Sediment storage provided 1.00 ft Is there additional volume stored above the state -required temp. pool? Y (Y or N) Elevation of the top of the additional volume 25.4 imsl OK Form SW401-Wet Detention Basin-Rev.9-4118112 Parts I.8 II. Design Summary, Page 1 of 2 Permit (to be provided by DWQ) N. DESM lWOWA'!'ttttN+1+1 Surface Areas Area, temporary pool 23,108 f? Area REQUIRED, permanent pool 25,200 ft SAIDA ratio 3.35 (unitless) Area PROVIDED, permanent pool, A,._pw 16,509 if Insufficient permanent pool surface area Area, bottom of 1Oft vegetated shelf, Ay�A,,f 15,463 it` Area, sediment cleanout, top elevation (bottom of pond), Am -POW 3,622 ilt Volumes Volume, temporary pool 52,493 ft3 OK Volume, permanent pod, Vpgrm_pod 56,065 ft3 Volume, forebay (sum of forebays If more than one forebay) 2.610 ft3 Forebay % of permanent pool volume 4.7% % Insufficient forebay volume. SAIDA Table Data Design TSS removal 85 % Coastal SAIDA Table Used? Y (Y or N) Mountain/Piedmont SAIDA Table Used? N (Y or N) SAIDA ratio 3.35 (unitless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10-2b) Y (Y or N) Volume, permanent pool, Vp m_,d 56,065 fe Area provided, permanent pod, Ap m_pw 16,509 fe Average depth calculated 3.40 ft OK Average depth used in SAIDA, d. (Round to nearest 0.5ft) 3.5 It OK Calculation option 2 used? (See Figure 10-2b) N (Y or N) Area provided, permanent pool, Ap._pw 16,509 fe Area, bottom of 1Oft vegetated shelf, Ab ,ff 15,463 fe Area, sediment cleanout, top elevation (bottom of pond), AboLi=d 3,622 fe 'Depth' (distance b/w bottom of 10ft shelf and top of sediment) 4.40 1t Average depth calculated 5.40 ft OK Average depth used in SAIDA, d„r, (Round to down to nearest 0.5ft) 5.5 ft OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 3.00 in Area of orifice (if--non-circular) inz Coefficient of discharge (CD) 0.60 (unitless) Driving head (Hj 0.71 ft Drawdown through weir? N (Y or N) Weir type (unitless) r`, c C Coefficient of discharge (Cw) (unities F—G ®�/ 6— Length of weir (L) ft Driving head (H) ft JUL 17 2017 Pre -development 1-yr, 24-hr peak flow 3.97 ft3/sec Post -development 1-yr, 24-hr peak flow 25.47 ft3/sec Storage volume discharge rate (through discharge orifice or weir) 0.20 it/sec BY' Storage volume drawdown time 2.47 days OK, draws down in 2-5 days. Additional Information Vegetated side slopes Vegetated shelf slope Vegetated shelf width Length of flowpath to width ratio Length to width ratio Trash rack for overflow & orifice? Freeboard provided Vegetated filter provided? Recorded drainage easement provided? Capures all runoff at ultimate build -out? Drain mechanism for maintenance or emergencies is: 3 :1 OK 3 :1 Insufficient shelf slope. 3.0 It Insufficient shelf length. We :1 OK n/a :1 OK Y (Y or N) OK 0.6 it Insufficient freeboard, minimum of 1-ft required Y (Y or N) OK Y (Y or N) OK Y (Y or N) OK Pump Form SW401-Wet Detention Basin-Rev.9-4/18/12 Parts I. & II. Design Summary, Page 2 of 2 Johnson, Kel wo. �D q�)o I dflD From: Mark Arcuri <MArcuri@sepiengineering.com> Sent: Friday, January 12, 2018 12:25 PM To: Johnson, Kelly Cc: erin.acton@wellsfargo.com; Greg Thompson Subject: [External] RE: SW8 060608, Villages at Turtle Creek - State Stormwater Permit Attachments: Revised Drainage Table.pdf; SIGNED Avg Depth Calcs.pdf UWTIOM: External email Do not dirk links or open attachments sunless verified- Send all suspicious email as an attachment to report.spam@nc.gov. Kelly, thanks again for your help. • See attached average depth calc per your request. • It appears there are various impervious values in previous applications and permits and so it is very confusing. We updated the table attached to reflect the current permitted values for 1D-1 and !D-2. Sorry for this confusion. Thank you. Let me know if you have further questions. Thank you!!!! Mark Arcuri, PE I Site/Civil Department Manager SEPI Engineering & Construction 5030 New Centre Drive I Suite B I Wilmington, NC 28403 Direct: 910.660.0505 1 Cell:910.228.0424 1 sepieneineerine.com Connect with us: Linkedln I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thankyou. From: Johnson, Kelly[mailto:kelly.p.johnson@ncdenr.gov] Sent: Friday, December 8, 201711:00 AM To: Greg Thompson <GThompson@sepiengineering.com> Cc: Mark Arcuri <MArcuri@sepiengineering.com>; erin.acton@welisfargo.com Subject: SW8 060608, Villages at Turtle Creek - State Stormwater Permit Greg, I went through this one this morning, and I just have two (hopefully easy) questions. I wasn't going to write a formal letter requesting information in the interest of time. Please let me know if you need a formal letter for your records. have also attached the draft permit for your review. I think I have captured everything, but please let me know if something is missing. There are a lot of details here. (This is just the modification. Once I get this out, I will pass it to the inspectors for the inspection and I'll go through all of the transfer paperwork.) 1. Average Depth: Can you send me the average depth calculation since it is changing? 2. Future Impervious: a. The previous permit had more impervious for 1D-1 and 1D-2 than you all are asking for: Permit Application 1/10/17 1A-1 11,025 11,025 ft 1A-2 6,875 6,875 ft 1A-3 2,361 2,361 ft' 1B 339,953 339,953 ft icy 137,639 137,639 ft' iD-1— 21,851 20,771 fta 1D-2 i 46,6521 42,810 ft' 'Arid prior permits. b. Here is what I recommend: If you claim "future" impervious for these two basins you will maintain the previously -permitted total. ("Future" is essentially a slush fund of impervious that can be allocated later.) Sawn Basin Basin Basin Basin Basin Drainage Area :.Tits IA-1 ».. ► �9.988 r 1A-2 IA-3 16,454 I 7.072 I 1C �2BE. it 3 1i3-i 138.304 s 14?� $0:666 Onsite R2 i 29:988 16.454 i 7,072 i 283.381 - 38,304 180.6W ts O ite 0 0 + 0 G i 0 0 �_--__.��..:..m Total BUA 11,025: 6,75 2,361 137,639 21.851 46,682 Lot 8UA 0 0`• 0 84,8751 1,066 12.382 Roads!Park+ng I 8.876 5,2381 1,697 36-2731 16.068 24443 Sidewalks € ft` 2.14W 1.6371 6641 11,809' 3.6371 6,385 Other ° 0�' 01 0j 4,682` 0 4 Otfsite f 0' 0. 0! 0. 0 0 Future AE.ocak-on Avai abm I 0; 0• 0 a 1.080 3,842 Basin Depth — — i- Feet 0.75 #: 1.25 i 1.26 2.25 2.25 2.05 Design Storm Inches 4.5 4.5 + 4.5 1.5 4.5 4.5 SHWT FLISL 29 28 I 28 10 24 1 23.7 Bottom ElevatJon ( FMSL 31 ;' 30 30 12 27 26.7 Stolleze Area QBottom ,`- 6.025 2.208 i 1,085 9,377 2.790 6.534 Storage Volume tt- 4,879 ; 3,331 i 1,767 26,W9 9.450 17,336 Sto�B�Tess Elevaiior. FMSL + 31.75 ?: 3125 31.25 14.25 29.25 27.75 Expected Infiltration Rate iNhr 0.52 0.52 ' 0.52 3 2.6 2.6 Tivre to Draw Down Hours 16 _ i; 28 20 - 7 . 13 1 12 Type of Soil Woodington Fine Sandy + Orslow Sandy Loam Loam Beclty's Creels -- River Basin Stream Index Number 9 Cape fear 18-87-8 las Cslileation of Water Body= iY -._.. _� ..._ "SkHoIJV'_. Thanks, Kelly 1C<_'e ,IjDhvusolA, Kelly Johnson Environmental Engineer NC Division of Energy, Mineral and Land Resources Stormwater Permitting 127 Cardinal Drive Extension Wilmington, NC 28405-3845 Phone: 910.796.7331 2 SEPI � L NO IN E ER IN G & ..E:. C0 N5TRUGT10N Proiect� Vl� 1].JQ8 rM06ZAof Subject. kWzIW4 fit- i�r��t" Djttt, _ \-,7 Designers--- ---- — — —_ `Fr'&t'1ap,= � shown d.— Average depth of permuent pevl to use in fire SA'1M tables f ff> i rot tl;r,(wp. r f ,Am_,n,I (•'� .,�� +��x_paatit � A—pth t stabAzed 3 L _ JJJ l 2 i .. Pa ' Temporary pec) e ptrmawnt pool 5tde slaps ogglet Arvvt k ; bottout of vtaetaw tdtel; .11. Foreblt tealp.0my p"?, i OMM of paad (Sadiment Vegetatei We elope$ ! ,citatt-aw top alavabon) trhalf . 2 t i tget ornfeee { Sediuteut claatt-otrt 104 101 bottom elevation *"t t Forcbay Berm SF-31rr.e"t rtarage {,rein 1 ft) U epth 1,1vancr between bottom of shelf and bottom of pond (mIWca sedunent} (f!) _ _.. Ak., ,a r S wfate area at bottom of shelf (sncIudts morn pond $ forebay(s)) (&3� f,=_y. surface area at permanent pool {includes mum pond for rbuy(s)) (H•V) Surfac a aces at bottom cf pond excluding seaim tnt stesuge (main pond oaly) (M Yy ,y Voiuzne of pt;rmanest pool (includes straw pond &. fvrtbay(s), extiudea srdimesa) (ft3) JAN 12 261" 4► . BY: - $1 7 f-7s l 0� f.-� 21 co-v. 0 f+- Casmer, Jo From: Casmer, Jo Sent: Monday, October 23, 2017 4:26 PM To: 'erin.acton@wellsfargo.com'; 'marcuri@sepiengineering.com' Subject: The Villages at Turtle Creek; Stormwater Permit SW8 060608 The Wilmington Regional Office of the Division of Energy, Mineral, and Land Resources (Stormwater Section) accepted the Stormwater Permit Minor Modification Application on October 23, 2017. The project has been assigned to Kelly Johnson and you will be notified if additional information is needed. Please be advised that no construction activities may commence until the Stormwater Permit is issued. Jo Casmer Administrative Assistant for DEMLR/Stormwater Section North Carolina Department of Environmental Quality Department of Environmental Assistance & Customer Service 910 796-7336 office 910 350-2004 fax io.casmer@ncdenr.gov 127 Cardinal Drive Extension Wilmington, NC 28405 F - - 0'. r l�IVG1.1 4i s Compres 'R.AF... Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Completeness Review Checklist Project Name: Jj /(6--gyp 'V'� 771-4 Received Date: Project Location: CI`e-x-� Accepted Date: ule"sr 7-008 Coastal 1995 Coastal Phase II (WiRO.) r ®Universal 88 Coastal `® _]1 Type of Permit: New or Mcd or �xisting Permit # (Mod or PR): 0 (0p(ap- 1:1PE Cert on File? Density: hD or LD i -type: ial or Residential �NCG: OK?) Stream Class: ❑SA Map �Offsite to SW8 ,Subdivided?: Subdivisi^^ or Single Lot Ir JORW Map MExempt Paperwork Emailed Engineer on: F,166'p-plement(s) (1 original per BMP) BMP Type(s): &M with correct/original signatures (1 original per BMP except LSI""✓AcS and sswwales) �✓ Applic tion rnrith corrQct;`originai slgnatures heed . v to A - Corp or LLC: Sig. Auth. per SOS or 'matter I', ` mail Address: Design Engineer in 6mo) Mc�.rNtoj r"71,Email Address: Owner 05oi Report with SHWT i t PCs `r_a ;.I.'evlewLs F—IC.3-Iculations (signeo.%sealed) � 4�L�No obvious errors Density includes common areas, etc Deed Restrictions; if subdivided: Signed & Notarized Plans/V , fA'"4v'�t- 2 Sets Details (roads, cul-de-sacs, curbs, sidewalks, BMPs, Buildings, etc) Pf— Grading Wetlands: Delineated or No Wetlands icin i Map Layout (proposed BUA dimensions) M V 01�egend �DA Maps ®Project Boundaries Infiltration Wet Pond Offsite Soils Report Soils Report �PE Cert for Master Lot #: SHWT: SHWT: Deed Rest for Master Lot # Matches Master Bottom: ! PP: BUA Permitted (Master): sf Visited: BUA Proposed (Offsite): sf Additional Information: Permitted Proposed: Proposed:_ Proposed: BUA (sf) DA (sf) ! PP (el) SHWT (el) i Depth (ft) SA (sf) Completeness Review Checklist Projet� Name:fReceived Date: Project Location.: �Q�• Accepted Date: Paperwork Emailed Engineer on: Supplement(s) (1 original per BMP) RIM Type(s): &M with correct/original signatures (1 original per BMP except LS/VFS and swales) Application with correct/original signatures eed orp or LLC: Sig. Auth. per SOS or letterOLRY91t duress: $505 (within 6mo) fir Email Address: 3• Design Engineer Owner Soils Report with SHWT (A-;-0k-A Note t er• ''Calculations (signed/sealed)A F--740 No obvious errors - - r— I!Density includes common areas, etc Deed Restrictions, if subdivided: �L JD Plans Details (roads, cul-de-sacs, curbs, sidewalks, BIKfiPs, Buildings, etc) Wetlands: Delineated or No Wetlands Layout (proposed BUA dimensions) �DA Maps Project Boundaries Additional Information: Permitted Proposed: Proposed:Proposed: BUA (sf) DA (sf) PP (el) SHWT (el) l Depth (ft) i SA (sf) i ENGINEERING& CONSTRUCTION Transmittal Letter To: NCDEQ 127 Cardinal Drive Extension Wilmington, NC 28405 Attention: Kelly Johnson Stormwater Permitting 919-796-7215 From: Mark T. Arcuri, PE SEPI Engineering & Construction, Inc. Subject: The Villages at Turtle Creek SW8 060608 Permit Transfer Application We are sending you: F- Shop Drawings Prints r10- Specifications Copy of Letter r Contracts F Invoice SEPI Engineering & Construction, Inc. 5030 New Centre Drive I Suite B I Wilmington, NC 28403 Main: 910.523.5715 1 Fax: 910.523.5716 sepiengineering.com ECEI ►E Date: Oc er 13, 2017 Oct BY Copies: SEPI File VIA: Hand Delivery SEPI Project Number: SE16.015 r Plans r Samples f Change Order r Reports Copies Date Description 1 orig 9/1/2017 Check to NCDEQ for Amount of $505 1 orig & 1 copy 10/2/2017 Stormwater Permit Transfer Application Form 1 copy 10/13/2017 Current SW8 060608 Issued Permit 1 copy 10/13/2017 LLC Documentation by NC Secretary of State 1 copy 10/13/2017 Signed O and M Agreements 1 copy 8/24/2017 Current Deed 1 copy 10/13/2017 Signed Engineer's Certifications 1 copy 8/7/2007 Deed Restrictions & Protective Covenants Form 1 copy 9/8/2017 Compliance Inspection Report 1 copy 10/13/2017 Maintenance Invoice Records 1 copy 10/13/2017 Owner Report with Mortgage Company Comments: If you have any questions or need additional information, please contact me at 910-22-8-0424 or email marcuri@sepiengineering.com. Thank you! Sincerely, j • Signed. Page: 1/1 SEPIIRCONSTRUCTION Transmittal Letter To: NCDEQ 127 Cardinal Drive Extension Wilmington, NC 28405 Attention: Kelly Johnson Stormwater Permitting 919-796-7215 From: Mark T. Arcuri, PE SEPI Engineering & Construction, Inc. Subject: The Villages at Turtle Creek SW8 060608 Minor Modification We are sending you: r Shop Drawings W Specifications I- Contracts r Prints r Copy of Letter r- Invoice SEPI Engineering & Construction, Inc. 5030 New Centre Drive I Suite B I Wilmington, NC 28403 Main: 910.523.5715 1 Fax: 910.523.5716 sep!engineering.com Date: October 13, 2017 Copies: SEPI File VIA: Hand Delivery SEPI Project Number: SE16.015 Plans r Samples Change Order r Reports Copies Date Description 1 orig & 1 copy 10/2/2017 Stormwater Management Permit Application Form 1 orig & 1 copy 8/7/2007 Deed Restrictions & Protective Covenants Form `T 1 orig 10/13/2017 Wet Detention Pond Supplement 1 orig 10/13/2017 Wet Detention Pond O and M Agreement 1 copy 10/13/2017 Project Narrative and Calculations 2 copies 10/13/2017 USGS Map OCT !a 201 2 copies 10/13/2017 Plan sheets C-2.1 and C-3.0 1 copy 6/24/2016 Soils Report 1 copy 8/24/2017 Current Deed 1 copy 10/13/2017 LLC Documentation by NC Secretary of State Comments: If you have any questions or need additional information, please contact me at 910-228-0424 or email marcuri@sepiengineering.com. Thank you! Sincerely, /4444L r a Page: Signed: 1/1 Celebrating 15 Years SEPI INEERINC CONSTRUCTION October 11, 2017 Minor Modification Application for: NCDEQ Stormwater Management Permit SW8 060608 The Villages at Turtle Creek Phase I & II High Density Subdivision Wet Pond and Infiltration Basin Project Re: Stormwater Narrative and Calculations to modify Wet Detention Basin 1B Discussion of Existing Facilities: The conversion of Infiltration Basin 1B to Wet Detention Basin 1B in the Turtle Creek subdivision was completed and has been evaluated for performance. The pond will accept and hold the 1.5 inch runoff volume. Asbuilt elevations and contours were provided by ESP Associates, pond asbuilt drawings dated 6/30/17. Photos from June 23, 2017 Site Inspection ECEIVE OCT 13 2017 [�Y: As constructed the pond has an outlet structure with a 3 inch orifice set at 22.75' (Permanent Pool) and a 4'x4' grated opening top set at 25.52'. Flow is discharged through a 42" corrugated plastic pipe. The forebay transition weir is constructed with granite riprap and has been substantially armored. kL\ 0 '..••• 5030 New Centre Drive I Suite B I Wilmington, NC 128403 1 Phone: 910.523.5715 1 Fax: 910.523.5716 1 sepiengineering.com I @)SEPFengineers SEP' The top of the pond berm is at approximately 26.12' with a riprap lined emergency overflow with a crest elevation set at 25.60'. Discussion of Proposed Modifications: To minimize frequency of pond overflowing the emergency weir, the temporary pool elevation will be slightly lowered. Three 2' rectangular weirs will be cut in the outlet structure. Each weir will have a crest elevation of 25.00' (6.24 inches from the top). As a result, the 2, 5, and 10 year storms will flow through the emergency spill way. The top of the pond will be reached at a 25 year event. The following table represents the resultant pond elevations, discharge velocities and flow through the emergency overflow at specific storm events. Storm Event Water Elevation Velocity (fps) Flow (cfs) 1 yr 24 hr 25.29' No Flow No Flow 2 yr 25.67' 0.67 1.08 5 yr 25.94' 1.54 12.03 10 yr 26.10' 1.90 21.9 25 yr Pond Failure End of narrative. Sincerely, Gregory R Thompson, PE, PLS Attachments: Stormwater Calculations 2 Draw Down Calculations A= Q/ [Cd x SQRT(2 x g x h)] Volume Diameter of Oriface Area of Oriface Cd = g= h= Q= Time= 42,647 ftj/s 3 in 0.0491 ftz 0.6 32.2 ft/sz 0.750 ft 0.205 ft3/s 208,350.13 Seconds 2.41 Days (F.P. elev.- N.P. elev.) /3 Hydrograph Report 1 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. 1 SCS Pre-Dev Hydrograph type = SCS Runoff Peak discharge Storm frequency = 1 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 17.269 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of cons. (Tc) Total precip. = 3.73 in Distribution Storm duration = 24 hrs Shape factor 4.00 3.00 2.00 1.00 120 240 360 480 600 Hyd No. 1 SCS Pre-Dev Hyd. No. 1 -- 1 Year Thursday, 08 / 3 / 2017 4.149 cfs = 732 min = 26,734 cuft = 55 = Oft = 25.00 min = Type II = 484 Q (cfs) 5.00 4.00 3.00 2.00 1.00 0.00 720 840 960 1080 1200 1320 1440 1560 Time (min) Hydrograph Report 2 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. A 0.5 Thursday, 08 / 3 / 2017 Hyd. No. 2 SCS Post-Dev Hydrograph type = SCS Runoff Peak discharge = 26.47 cis Storm frequency = 1 yrs Time to peak = 729 min Time interval = 1 min Hyd. volume = 96,191 cult Drainage area = 17.269 ac Curve number = 76 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of cone. (Tc) = 25.00 min Total precip. = 3.73 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 24.00 20.00 16.00 12.00 8.00 4.00 SCS Post-Dev Hyd. No. 2 -- 1 Year Q (cfs) 28.00 24.00 20.00 16.00 12.00 8.00 4.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 2 Time (min) ' Hydrograph Report 3 Hydraflow Hydrographs Extension for AutoCAD® Civil MOD 2016 by Autodesk, Inc. A 0.5 Hyd. No. 3 New Routing Hydrograph type = Reservoir Peak discharge Storm frequency = 1 yrs Time to peak Time interval = 1 min Hyd. volume Inflow hyd. No. = 2 - SCS Post-Dev Max. Elevation Reservoir name = Turtle Creek Pond Max. Storage Storage Indication method used. 24.00 K411111 16.00 12.00 M 4.00 Thursday, 08 / 3 / 2017 = 3.443 cfs = 776 min = 77,417 cult = 25.29 ft = 49,140 cuft New Routing Hyd. No. 3 --1 Year Q (cfs; 28.00 24.00 16.00 12.00 8.00 4.00 0.00 300 600 900 1200 1500 1800 2100 2400 2700 3000 Hyd No. 3 Hyd No. 2 Total storage used v 49,140 cult Time (min) Hydrograph Report n Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. 1 SCS Pre-Dev Hydrograph type = SCS Runoff Peak discharge Storm frequency = 2 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 17.269 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 4.52 in Distribution Storm duration = 24 hrs Shape factor Q (cfs) 10.00 W 6.00 4.00 2.00 120 240 360 480 Hyd No. 1 SCS Pre-Dev Hyd. No. 1 — 2 Year Thursday, 08 / 3 / 2017 = 9.575 cfs = 731 min = 47,106 cuft = 55 = Oft = 25.00 min = Type II = 484 Q (cfs) 10.00 M. 6.00 2.00 0.00 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hydrograph Report 5 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. A 0.5 Hyd. No. 2 SCS Post-Dev Hydrograph type = SCS I:unoff Peak discharge Storm frequency = 2 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 17.269 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of cone. (Tc) Total precip. = 4.52 in Distribution Storm duration = 24 hrs Shape factor Q (cfs) 40.00 9I 11 20.00 10.00 SCS Post-Dev Hyd. No. 2 -- 2 Year 120 240 360 480 600 720 840 Hyd No. 2 Thursday, 08 / 3 / 2017 = 37.53 cfs = 728 min = 134,511 cult = 76 = Oft = 25.00 min = Type II = 484 Q (cfs) 40.00 30.00 1 �� 10.00 0.00 960 1080 1200 1320 1440 1560 Time (min) 6 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. 00.5 Hyd. No. 3 New Routing Hydrograph type = Reservoir Peak discharge Storm frequency = 2 yrs Time to peak Time interval = 1 min Hyd. volume Inflow hyd. No. = 2 - SCS Post-Dev Max. Elevation Reservoir name = Turtle Creek Pond Max. Storage Storage Indication method used. 30.00 20.00 10.00 New Routing Hyd. No. 3 -- 2 Year 300 600 900 1200 Hyd No. 3 Hyd No. 2 1500 Thursday, 0813 / 2017 = 16.16 Cts = 746 min = 115,557 cult = 25.67 ft = 58,185 cuft Q (cfs; 40.00 30.00 20.00 10.00 0.00 1800 2100 2400 2700 3000 Total storage used = 58,185 cuff Time (min) Hydrograph Report 7 Hydraflow Hydrographs Extension for AutoCAD® Civil 3136 2016 by Autodesk, Inc. A 0.5 Hyd. No. 1 SCS Pre-Dev Hydrograph type = SCS Runoff Peak discharge Storm frequency = 5 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 17.269 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 5.84 in Distribution Storm duration = 24 hrs Shape factor 20.00 16.00 12.00 M 4.00 Thursday, 08 / 3 / 2017 = 21.83 cis = 730 min = 89,436 cult = 55 = Oft = 25.00 min = Type II = 484 SCS Pre-Dev Hyd. No. 1 — 5 Year Q (cfs) 24.00 20.00 16.00 12.00 8.00 4.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Report 8 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. A 0.5 Hyd. No. 2 SCS Post-Dev Hydrograph tyre = SCS Runoff Peak discharge Storm frequency = 5 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 17.269 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 5.84 in Distribution Storm duration = 24 hrs Shape factor Q (cfs) 60.00 50.00 40.00 30.00 20.00 10.00 SCS Post-Dev Hyd. No. 2 -- 5 Year Thursday, 08 / 3 12017 = 57.14 cfs = 728 min = 203,260 cuft = 76 = Oft = 25.00 min = Type II = 484 Q (cfs) 60.00 60.00 40.00 30.00 20.00 10.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 2 Time (min) Hydrograph Report 9 Hydraflow Hydrographs Bdension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. 00.5 Hyd. No. 3 New Routing Hydrograph type = Reservoir Peak discharge Storm frequency = 5 yrs Time to peak Time interval = 1 min Hyd. volume Inflow hyd. No. = 2 - SCS Past-Dev Max. Elevation. Reservoir name = Turtle Creek Pond Max. Storage Storage Indication method used. 50.00 40.00 30.00 K111Z17 10.00 120 240 360 480 600 Hyd No. 3 Hyd No. 2 New Routing Hyd. No. 3 -- 5 Year Thursday, 08 / 3 / 2017 = 47.38 cts = 735 min = 184,103 cult = 25.Q4 ft = 64,814 cult Q (cfs) 60.00 61111101 .,i1](6n 30.00 20.00 10.00 0.00 720 840 960 1080 1200 1320 1440 1560 Total storage used = 64,814 cuff Time (min) Hydrograph Report 10 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Hyd. No. 1 SCS Pre-Dev Hydrogrup" tYMe = SCS Runoff Peak discharge Storm frequency = 10 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 17.269 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 7.01 in Distribution Storm duration = 24 hrs Shape factor Q (cfs) 35.00 30.00 25.00 20.00 15.00 10.00 5.00 SCS Pre-Dev Hyd. No. 1 --10 Year Thursday, 08 / 3 / 2017 = 34.83 cfs = 729 min = 133,535 cuft = 55 = Oft = 25.00 min = Type II = 484 Q (Cfs) 35.00 30.00 25.00 20.00 15.00 10.00 5.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Report 11 Hydraflow Hydrographs Extension for AutoCAD® Civil 3130 2016 by Autodesk, Inc. v10.5 Thursday, 08 / 3 / 2017 Hyd. No. 2 SCS Post-Dev Hydrograph type = SCS Runoff Peak discharge = 75.13 cfs Storm frequency = 10 yrs Time to peak = 728 min Time interval = 1 min Hyd. volume = 267,436 cuft Drainage area = 17.269 ac Curve number = 76 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 25.00 min Total precip. = 7.01 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Post-Dev Hyd. No. 2 -- 10 Year 70.00 60.00 50.00 40.00 011111 20.00 10.00 Q (cfs) 80.00 70.00 .WE 50.00 40.00 30.00 20.00 10.00 0.00 -' ' ' I I I I i 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 2 Time (min) Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. v10.5 Hyd. No. 3 New Routing Hydrograph type = Reservoir Peak discharge Storm frequency = 10 yrs Time to peak Time interval = 1 min Hyd. volume Inflow hyd. No. = 2 - SCS Post-Dev Max. Elevation Reservoir name = Turtle Creek Pond Max. Storage Storage Indication method used. Q (cfs) 80.00 70.00 60.00 50.00 40.00 30.00 20.00 New Routing Hyd. No. 3 --10 Year 12 Thursday, 08 / 3 / 2017 = 71.07 cis = 731 min = 248,168 tuft = 26.1Oft = 68,583 cult Q (cfs) 80.00 70.00 50.00 40.00 30.00 20.00 10.00 — 10.00 0.00 -�-- - 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 3 — Hyd No. 2 Total storage used = 68,583 tuft Time (min) �I v. C O N �O LL. J LQ t9 C O h;e Ml- m LL' 0 0 0 0 o m C7 N C W i _ -4 co cc as N"-* - - - lie I, I j ro ; m i4l � ]m IPA Iq i I v A I - 1111 1 Project Description Solve For Input Data Headwater Elevation Crest Elevation Tailwater Elevation Crest Surface Type Crest Breadth Crest Length Results Discharge Headwater Height Above Crest Tailwater Height Above Crest Weir Coefficient Submergence Factor Adjusted Weir Coefficient Flow Area Velocity Wetted Perimeter Top Width Worksheet for 2-yr Spillway Discharge Gravel 25.67 ft 25.60 ft 0.00 ft 8.00 ft 23.00 ft 1.08 ft3/s 0.07 ft -25.60 ft 2.53 US 1.00 2.53 US 1.61 ft2 0.67 ft/s 23.14 ft 23.00 ft Bentley Systems, Inc. Haestad Methods SoldlYsmt" llewMaster VBi (SELECTseries 1) [OB.11.01.03] 10/1012017 2:03:55 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06796 USA +1-203-755-1666 Page 1 of 1 Worksheet for 5-yr Spillway Project Description Solve For Discharge Input Data Headwater Elevation 25.94 ft Crest Elevation 25.60 ft Tailwater Elevation 0.00 ft Crest Surface Type Gravel Crest Breadth 8.00 ft Crest Length 23.00 ft Results Discharge 12.03 fV/s Headwater Height Above Crest 0.34 ft Tailwater Height Above Crest -25.60 ft Weir Coefficient 2.64 US Submergence Factor 1.00 Adjusted Weir Coefficient 2.64 US Flow Area 7.82 ft2 Velocity 1.54 ft/s Wetted Perimeter 23.68 ft Top Width 23.00 ft Bentley Systems, Inc. Haestad Methods SOILEkO 6 Mkn Master V8i (SELECTseries 1) [08.11.01.031 10110/2017 2:04:16 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Project Description Solve For Input Data Headwater Elevation Crest Elevation Tailwater Elevation Crest Surface Type Crest Breadth Crest Length 'Results Discharge Headwater Height Above Crest Tailwater Height Above Crest Weir Coefficient Submergence Factor Adjusted Weir Coefficient Flow Area Velocity Wetted Perimeter Top Width Worksheet for 10-yr Spillway Discharge Gravel 26.10 ft 25.60 ft 0.00 ft 8.00 ft 23.00 ft 21.90 ft3/s 0.50 ft -25.60 ft 2.69 US 1.00 2.69 US 11.50 ft2 1.90 ft/s 24.00 ft 23.00 ft Bentley Systems, Inc. Haestad Methods SoltOhW BViinwMaster V8i (SELECTseries 1) [08.11.01.03] 10/10/2017 2:04:29 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 10/10%2017 Precipitation Frequency Data Server NOAA Atlas 14, Volume 2, Version 3 Location name: Hampstead, North Carolina, USA* Latitude: 34A506% Longitude:-77.5786* Elevation: 29.35 ft** source: ESRI Maps *' source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Duration Average recurrence interval (years) 0�-�0 10 25 501 100 F 500 1000 0.m1 0.595 0.696 0.775 0.875 0.950 1.03 1.10 1.20 1.29 5�rtln 0A64-0.542) (0.551-0.645) 0.643-0.753 (0.714-0.837)11(0.802-0.943) (0.868-1.02) (0.932-1.11)11(0.996-1.19) (1.08-1.30) (1.14-1.40 10{rlin 0 74 -0866 0.882--1203 1.03 1?21 1.14-1.4 1.283550 1.38i163) 1 A86.76 1.58 1 89 (1.70-2.06)1(1.79 2 20 1.00 1.20 1.41 1.57 7.77 1.92 2.06 2.21 2.40 2.54 15-min (0.927-1.08)11 (1.11-1.30 (1.30-1.53 (1.44-1.69) 1 1.75-2.07) 1.87-2.23 (1.99-2.38) 1(2.14-2.60 (2.25-2.76) 30-min 1.27-31 49 1.5361579 1. 5 2017 2.09 2A5 2.40 2?82 2.64 3911 2.87 3 Al 3.10-3 71 3.41-4113 3.64-4A7 2.96 60-min 1: 8-1.85 1.92 2725 2.37 2778 (2.723 20) (3. 9 3976) 11(3.57-4.22 3. 5-4 70 4. 5 5?21) 4.89 5.93 (5.32-6.52 2.08 2.54 3.23 3.80 F 5.29 6.03 6.83 8.00 8.99 2-hr (1.92-2.27) 1 (3.49-4.13) (4.20-5.01) (4.80-5.74)11(5.44-6.55) (6.12-7.42) (7.09-8.71)1(7.91-9.82) 3.4 2.74 3.50 4.14 5.09 91 6.81 7.81 10.6 3-hr (2 07-2 46) (2.523.00) 3.21-3.83 (3.79A.53 (4.63-5.55 (5.33-6.44 ����� 6.10-7.42 (6.93-8.50) ,,.30 (8.16-10.1 9.19-11.6) 6-hr (2 52 3.03 (3.073g70) 3.92�g73 4.645 61) 5. 8 6890) (6.56 8102) (7. 2 9 27 8.57 10.7 (1 1� 2.8) (11.5-14.7 3• 3.95 5.09 6,07 F 8.83 10.3 11.9 14.4 16.B 12-hr (2.94 3.B0)1 (3.58-4.39) 1 (4,61-5.66) 1 (5.47-6.74) (6.748.35) (7.83-9.75) (9.04-11.3) l(10.4-13.1) (12.3-15.9) (14.0-18.3 3.73 4.53 5.85 7.07 8.75 10.3 12.0 13.9 16.9 19.5 24fir 3.42-4.10) 6.40-7.69 (7.92-9.59) (9.22-11.3) 1(10.6-13.2 12.2-15.3) (14.5-18.7)1(16.4-21.7 4.35 5.26 6.76 8.05 10.0 11.7 13.7 15.8 19.1 22.0 2-day 3.99�.79 4.83-5.80) 6.18-7.44 (7.32-8.85) 11 (9.03-11.0 (10.5-12.9)11(12.1-15.1)11(13.8-17.5) 1(16.4-21.3 18.5-4.7) 3-dey =(6.57.817.68 �.4) 4. 3 5706 5.126712 9?4 9.40 (10.9- 3.3 (12A- 5A (141617.8 16.16-21.5 (18.7- 4.8 4.87 5.88 7.46 8.80 10.8 12.5 74.3 F 19.5 22.3 a -day (4.48-5.33) 5A16A5) 11 (6.846.17) 11 (8.04-9.64) 11 (9.77-11.8) 11(11.2-13.6) (12.8-15.7) (14.418.0) 16.9-21.6) (19.0-24.9) 5.61 6.76 8.49 9.94 12A 13.8 15,7 17.8 20.8 23.3 7-day (5.196.10) 1 (6.25-7.35) 11 (7.84-9.23) 1 (9.14-10.8) 11 (11.0-13.1) (12.5-15.0)11(14.1-17.1) (15.8-19.4) (18.2-22.9)1(20.1-25.8) 10-day 5.806.79 6. 58.14 8.5910.1 9.94- 1.7) 11.19- 4.0 13A- 6.0 1516 8.1 16 88 0.5 (1 2� 3.9)1(21.11- 6.8 8.30 9.89 72.0 13.8 16.3 18A 20.6 22.9 26.2 28.9 20{lay 7.758.92) 9.23-10.6) 11.2-12.9 (12.8-14.8) 11 (15.1-17.5 16.9-19.8) 18.8-22.2 (20.7-24.8) (23.3-28.5) 25.4-31.6 10.1 12.0 14.5 16A 19.1 21.3 23.5 25.8 29.0 31.5 30-day 9.53-10.8 11.3-12.9 (13.6-15.4) 1 (15.4-17.5 (17.9-20A) II(19.8-22.8 21.7-25.2 23.6-27.8) 26.2-31.3 28.2-34.2 12.7 15.1 17.9 20.2 23.5 26.1 28.7 31.5 35.3 38.3 45-day (12.0-13.6) (14.2-16.1 (16.8-19.2 19.0-21.6) (21.9-25.1) (24.2-27.9( 26.5-30.8)11(28.8-33.9) (31.9-38.2) 34.3-41.7 15.4 78.2 21.3 23.8 29.9 32.6 35.3 39.0 47.7 60{lay =2576LM.0-31.9) (14.6-16.4) (17.2-19.3) (20.1-22.7) (22.5-25.3 (30.4-34.8) (32.7-37.8 (35.7r41.9) (38.0-45.1) t Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) Is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. _ Back to Top PF graphical https://hdsc.nws.noaa.gov/hdsc/pfdslpfds_printpage.html?lat=34A506&Ion=-77.5786&data=depth&units=english&series=pds 114 Excise Tax $0.00* wnininiim�niainn Doc No: 20027843 Recorded: 08129=1712:48:36 PM Fee AMt $26.00 Pape 1 of 4 Exclse Tax: $0.00 Pander County North Carolina Sharon Lear Willoughby, Register of Deeds sK 4M PG 221 - M (4) 49,15 12-4z9 i -0000 ef2�5--7g-1489 —COW Recording Time, Book and Page Tax Lot No.: Parcel Identifier No. — Verified by County on the day of , 20 _a0_ mm-cin Atwq tw.x Mail after recording to: GRANTEE This instrument was prepared by: 8cL Gates LLP, Hearst Tower, 214 North Tryon Street, Charlotte, NC 28202 - PMR (without title examination). Brief description for the Index: phase 2 Conservation Arras and Common Open Space - The Villages of Turtic Crock NORTH CAROLINA NON -WARRANTY DEED THIS DEED made as of this a�eday of , 2017, by and between GRANTOR REBUS NC COASTAL, LLC, a Delaware limited liability company whose mailing address is: 301 South College Street, D1053-04B Charlotte, NC 28288 THE VELLAGES AT TURTLE CREEK HOMEOWNERS ASSOCIATION, INC., a Norio; Ca —,.lira non-profit corporation whose mailing address is: 1909 Eastwood Road, Suite 321 Wilmington, NC 28403 Enter in appropriate block for each party: name, address, axA if appropriate, character of entity, e.g., corporation or partnership. The designation Grantor and Grantee as used herein shall include said parties, their heirs, successors, and assigns, and shall include singular, plural,'nWculine, feminine orneuter as required by context. VArrMSETH, that the Grantor, far a valuable consideration paid by the Grantee, the receipt of which is hereby acknowledged, has and by these presents does grant, bargain, sell and convey unto the Grantee in fee simple, all that certain lot•or parcel of land situated in Topsail Township, Pender County, North Carolina, and more particularly described as follows: See Exhibit which is attached to and incorporated into this Deed by reference. *Under N.C.G.S. § 105-228.29: no excise tax is due in association with a transfer where no considerut on in property or money is due or paid by the grantee to the grantor. 3009810590 �C�IVF �{ OCT 13 07 11 _ BK 4650 PG 222 DOC# 20027843 Bk 4550 Pg 222 The property heremabove described was acquired by Grantor by mstrument(s) recorded in Book 3754 at Page Z in the Ponder County, North Carolina, Public Registry (the "Registry'). A map showing the above described property is located in Plat Book 52 at Page j:38 in said Registry. TO HAVE AND TO HOLD the aforesaid lot or parcel of land and all privileges and appurtenances thereto belonging to the Grantee in fee simple. The Grantor makes no warranty, express or implied, as to title to the property 6ereinabove described. All or a portion of the property herein conveyed does not include the primary residence of Grantor. Grantor has been advised by Grantee as follows: (1) Grantee is a homeowners' association as defined in § 528(c) of the internal Revenue Code, (2) the property conveyed herein will be held by the Grantee for the use, benefit and enjoyment of all members of the association equally, (3) each member of the Grantee has an irrevocable right to use and enjoy, on an equal basis, the property conveyed herein, subject to the Declaration, Bylaws and Rules and Regulations of the Grantee, (4) the irrevocable right to use and enjoy the properly conveyed herein is appurtenant to taxable real property owned by a member of the Grantee, and (5) the property conveyed herein should not be assessed or taxed against the Grantee pursuant to G.S. § 105-277.8. [SIGNATURES CONTAINED ON FOLLOWING PAGE] sooMON ve BK 4660 PG 223 DOC# 20027843 Bk46W Pg 223 written. IN WITNESS WHEREOF, the Grantor has signed this Deed as of the day and year first above GRANTOR: REDUS NC COASTAL, I LC, a Delaware limited liability company By: REDUS Properties, Inc., a Delaware Corporation, its sole member and manager By: Name: Erin M. Acton Title: Assistant Vice President STATE OF COUNTY OF , Q ( , I certify that Erin M. Acton personally appeared before me this day and acknowledged that she is an Assistant Vice President of REDUS PROPERTIES, INC., a Delaware corporation and the Sole Member and Manager of REDUS NC COASTAL, LLC, a Delaware limited liability company, and that she, in such capacity, being authorized to do so, voluntarily signed the foregoing on behalf of the company for the purposes stated therein. Date: �! Z ��`"� I By: `'�� .Cy C Print Name: KBliyll C. Bate M Notary Public [SEAL OR STAW] My Commission Expires: HATHRTR Q. BAUMAti Y Public - Sme M F*W@ MY CW0- EXOM Feb 20. 2010 1(a Commhefai i FF 171639 300881069 W BK 4650 PG 224 DOC# 20027843 Bk 4M Pg 224 EXHIBIT A to Deed Legal Description of Property Tract I (PIN: 42S-79412914Kq. land =515tingaf ILM 90mis, more br kW desWnNW •Comoration ArW (and loiter *48"rlt to Late S6r 57 and West Sodom Placo) u d tbam oa a amp tltirld'Rnw Plat ofTh a Vlllaw 6t runie cma Phw r and ro " ' f d h MaP lmele 52 tea its to dm oMm of the Regletar aF D=* far Prrder County. 6lorth owdb& Trod 2 (IMM: 4225.79-US94M: Laed I of Il xr�, rnGra ar Iasq, dmWfudW oftnM M C = Spme". and "l anwr uwtlm Ame 4and dtutted betMrrsn Lots 34 and SJ and ihbrrrt an s map Mod Of d Plat of 7IW VM%u et Turtle Cm* "=* r and reaerdsd In Map traok 52 ftV in In the OM M CFO" 1ltdlttir ei DtdN1E for Ponder Guungt, NOM Cara N; EA1 E AW E NW M4 tl n of the Yorr &Wft r A%r low WWft tf*0Mp" Ilrrm gfLat S4, Tied 3 (PIN:4MI-78.50q4M.. Lard wriddift of 031 wRu, nmre or Lem„ d+avated " Careeron GPM SPvW (and lexaesd ad(sceat to Wu t Stodrtarr Drlyay wind alrawn ern a mip dtlad'Rnel PletafTir Vafretpss at Turtle �rYek Phate 2' and recorded M Atep look. 522 Page SW In the o ice t ft Roister of Deeds For bender Courdy►. Nurtlr t:arsIML 30OW1059 0 lr% 1 ?wD& G)-) Iv ` Johnson, Kelly CF4_t1 If From: Johnson, Kelly Sent: Friday, September 15, 2017 9:32 AM To: 'todd@townofsurfcity.com' Cc: Greg Thompson (GThompson@sepiengineering.com); Mark Arcuri; Georgette Scott Subject: FW: SW8 060608, The Villages at Turtle Creek Attachments: Villages at Turtle Creek_2017 09 13.pdf Todd, I only cc'd you on this so that you would be aware. I don't know what your local flooding requirements are, but as you know, we don't handle flooding at the State level. This pond is smaller than we normally permit and so I wanted to make you aware of it in case you get calls, etc. Here is a summary of the design parameters that will come under the upcoming modification. If you have questions, please let me know. Thanks, Kelly c"V In adjustrrems, to t17e rairrert box, where ":hee 2'rectacigular we-^. are cut t0 a Cors1 �-,'evatlon Of 75.00' (&24 inches from t ke top), dw. 2, 5, and 10 yea) tto rns W& flow �hrauotr t.}ae err,eroery-y s:siil «ray, The top of the pond wall be reached at a 25 year event. ^�t+a�m. IEvent Water Wevotim Velocity UPS) Flow (do) 7. Yr 24 tar _ 25, 29' No Flow --0.67 _.... No Flow �? 2 yr aS.fi7' 1.0$ 5 Yt .. 25.94" _--t.54. , ._ 1.2_03 ' 1 €i r 25.10' 1.�i4 - 21.9 - 7 yr --- €�sind Failure W From: Johnson, Kelly Sent: Friday, September 15, 2017 9:20 AM To: Erin.Acton@wellsfargo.com; Greg Thompson (GThompson@sepiengineering.com) <GThompson@sepiengineering.com>; Mark Arcuri <MArcuri@sepiengineering.com>; 'Christina Purcell' <christina.purcell@gopropertymgt.com>; Gary Owens<gary.owens@gopropertymgt.com>;'todd@townofsurfcity.com' <todd@townofsurfcity.com> Subject: SW8 060608, The Villages at Turtle Creek All, As you are likely aware, there were discrepancies between the as -built survey and the intended design for this project. Over the summer we have been working to figure out exactly what the glitch was, its impact, and what to do about it. I had originally hoped to handle this as a permit correction, but after discussing it with my supervisor I think we need to handle this as a minor modification. Please see the attached letter for additional information. Thanks, Kelly k.eL Lui 0 k V'S o V'- KellyJohnson Environmental Engineer NC Division of Energy, Mineral and Land Resources Stormwater Permitting 127 Cardinal Drive Extension Wilmington, NC 28405-3845 Phone: 910.796.7331 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. /n ROY COOPER j a Governor MICHAEL S. REGAN Secretary Energy, Mineral & TRACY DAVIS Land Resources Director ENVIRONMENTAL QUALITY September 13, 2017 Ms. Erin Acton, Assistant Vice President REDUS NC Coastal, LLC 1 Independent Drive, 1 Oth Floor Jacksonville, FL 32202 Subject: Notice of Inspection — Request for Additional Information — Request for Transfer The Villages at Turtle Creek State Stormwater Management Permit No. SWS 060608 Pender County Dear Ms. Acton: A new pond was permitted to replace a failed infiltration basin on January 10, 2017. After the pond was constructed, an as -built survey was completed. Your engineering firm began working on the certification needed to transfer the permit, and in doing so discovered that there had been an error in the calculations submitted for permit approval. It is my understanding that the pond constructed does not meet the parameters that the design had intended. Request for Minor Modification: DEMLR and SEPI met on July 13, 2017 and discussed various design approaches received on July 171, July 20', and August 3". DEMLR staff also conducted a site inspection of the pond on September 8, 2017. We had originally determined that we would handle the changes via a permit correction, but after further internal discussion in DEMLR we have determined that it is necessary to document the changes via a minor modification. Please apply for a minor modification to rectify the design with the as -built conditions. There is no cost for a minor modification. As discussed in the cover letter of the January 10, 2017 permit, this pond has a complicated history. It was permitted most recently as an alternative design. The design essentially represented a pond that could treat the most water in the space available because the failed infiltration basin was surrounded by existing homes and wetlands. Please provide written, stamped justifications for the deviations from the January 10, 2017 design establishing that the constructed design still represents the best treatment mechanism given the site constraints. You are also encouraged to coordinate with the Town of Surf City to meet any applicable local requirements. Request for Permit Transfer: I understand that you all have generated a Permit Transfer document and forwarded it to the HOA for signature. I also understand that the HOA wants to confirm that the project is in compliance prior to signing the form. Please be advised that the regulations (SL2011-256) require a project to be in compliance prior to transfer. DEMLR is charged with conducting an inspection and making a compliant determination prior to the permit being transferred. But, an HOA is not required to sign the application in order for a permit to be transferred to them. In fact, it is unusual for an HOA to sign a transfer form. The typical process to transfer a permit from a developer (in this case a bank) to an HOA is to select Section Item B(2) of the Transfer form, "Only the current permittee/declarant of a condominium or planned community" has signed the form. Then, obtain copies of the common area deeds, documentation that at least 50% of the lots have been sold, a copy of the recorded deed restrictions, copies of the certifications, and copies of the O&M agreements so that they are ready to be submitted. Once you have this information and you have worked with your maintenance company to ensure that the project is maintained per the O&M agreement, submit the package to DEMLR for review. The cost for a permit transfer is $505. You may submit this information with the minor modification application, and the two applications will be processed in order. The project will be inspected during the transfer review process. (When I inspected the new pond on September 8, 20171 had thought that there was a recent inspection of the whole property to append it to. However, after returning to the office I realized that the full project State of North Carolina I Environmental Quality I Energy. Mineral and Land Resources Wilmington Regional Office 1 127 Cardinal Drive Extension I Wilmington, NC 28405 910 796 7215 State Stormwater Permit No. SW8 060608 Page 2 of 2 had not been inspected since 2015. I had told the HOA's property management contacts that I would be forwarding a full inspection with this letter. But, that will be forwarded during the transfer review process_) The following was the status of the project at from the last inspection dated September 9, 2015. Please ensure that the following have been. addressed: 1.) Maintenance: Infiltration basins were in need of maintenance. The site was maintained since the September 9, 2015 letter, but it appeared to have been needed again. 2.) Designer's Certification: The certification for Basin 1 C was on file. Partial certifications for Basins 1A and I were later provided_ A final certification for each BMP is still needed. 3.) Deed Restrictions: The Master Declaration of Protective Conditions for the Villages at Turtle Creek (BK3029/PGO10) only covers lots 1-45. Lots -46-71 in Phases I and II are not covered by this document. Recorded deed restrictions are needed for all of the lots. Please be advised that until you submit the required Permit Transfer Application Form to the Division and receive approval from the Division to transfer the permit, you are required to comply with the terms, conditions and limitations of the Stormwater Management Permit under Title 15A North Carolina Administrative Code 211.1003 and North Carolina General Statute 143-214.7, including the operation and maintenance of the permitted stormwater system. Please also note that any individual or entity found to be in noncompliance with the provisions of a stormwater management permit or the stormwater rules is subject to enforcement action as set forth in NCGS 143 Article 21, including the assessment of civil penalties of up to $25,000 per day. If you have any questions, please contact me at the Wilmington Regional Office, telephone number (910)- 796-7331 or via email at kelly.pjohnson@ncdenr.gov. igmeer 6tormwaterlPermits & Projects\20061060608 HD12017 09 CEI addinfo 060608 enc: SL2011-256 Permit Transfer Application Form Compliance Inspection Report cc: Greg Thompson, PE (via email only, GThompson@sepiengincering.com) Mark Arcuri, PE, (via email only, MArcuri@sepiengineering.com) Christina Purcell, Property Manager, (via email only, christina.purcell@gopropertymgt.com) Gary Owens, Property Manager, (via email only, gary.owens@gopropertymgt.com) Todd Rademacher, (via email only, todd@townofsurfcity.com) Georgette Scott, Wilmington Regional Office Stormwater Supervisor WiRO Stormwater Permit File State of North Carolina 1 Environmental Quality I Energy. MBneral and Land Resources Wilmington Regional office 1 127 Cardinal Drive Extension I Wilmington, NC 28405 910 !96 7215 GENERAL ASSEMBLY OF NORTH CAROLINA SESSION 2011 SESSION LAW 2011-256 HOUSE BILL 750 AN ACT TO (1) REQUIRE THE DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES TO TRANSFER A PERMIT FOR A STORMWATER MANAGEMENT SYSTEM FROM A DECLARANT OF A CONDOMINIUM OR PLAN- ED COMMUNITY TO AN. OWNERS ASSOCIATION UPON REQUEST OF THE PERMITTEE AND SUBMISSION OF DOCUMENTATION THAT DECLARANT CONTROL HAS TERMINATED, (2) PROVIDE THAT THE RULES OF A SANITARY DISTRICT MAY NOT BE MORE RESTRICTIVE THAN OR CONFLICT WITH THE REQUIREMENTS OR ORDINANCES OF A COUNTY WITH JURISDICTION OVER THE AREA; AND (3) PROHIBIT ANY PERSON FROM CONTRACTING OR SUBCONTRACTING TO RENT OR LEASE TO ANOTHER A PORTABLE TOILET OR MANAGE OR DISPOSE OF WASTE FROM A PORTABLE TOILET UNLESS THAT PERSON IS PERMITTED TO OPERATE A SEPTAGE MANAGEMENT FIRM. The General Assembly of North Carolina enacts: SECTION 1. G.S. 143-214.7 is amended by adding a new subsection to read - stormwater management system have been conveyed to the unit owners association or owners association in accordance with the declaration; (ii) the declarant has conveyed at least fifty percent (50%) of the units or lots to owners other than a rjPr.larant anri (1;;1 the ornrm.:,ofor management system is in substantial compliance with the stormwater permit issued to the permittee by ine liepartment. in support of a request made pursuant to this subsection a permittee shall submit documentation to the Department sufficient to demonstrate that ownership of the common area related to the operation and maintenance of the stormwater units F1 the meaning as provided in Chapter 47C of the General Statutes and declarant of a planned community shall have the same meaning as provided in Chapter 47F of the General Statutes." SECTION 2. G.S. 130A-55 reads as rewritten: "§ 130A-55. Corporate powers. A sanitary district board shall be a body politic and corporate and may sue and be sued in matters relating to the sanitary district. Notwithstanding any limitation in the petition under G.S. 130A-48, but subject to the provisions of G.S. 130A-55(17)e, each sanitary district may exercise all of the powers granted to sanitary districts by this Article. In addition, the sanitary district board shall have the following powers: (7) To adopt rules necessary for the proper functioning of the district. However, these rules shall not conflict with rules adopted by the Commission for Public Health, Environmental Management Commission, or the local board of health having jurisdiction over the area. Further, such rules shall be no more restrictive than or conflict with requirements or ordinances of any requirements or oramances of the county having_ jurisdiction over the area shall control. IIV�IIII�II SECTION 3.(a) In addition to the other portable sanitation permitting provisions of 15A NCAC 13B .0832(b), from the effective date of this act the Department of Environment and Natural Resources shall prohibit any person from contracting or subcontracting to rent or lease to another a portable toilet or manage or dispose of waste from a portable toilet, regardless of ownership of the portable toilet, unless that person is permitted to operate a septage management firm. SECTION 3.(b) No later than January 1, 2014, the Commission for Public Health shall adopt rules consistent with the provisions of Section 3(a) of this act. Notwithstanding G.S. 150B-19(4), the rules adopted by the Commission pursuant to this section shall be substantively identical to the provisions of Section 3(a) of this act. SECTION 4. This act is effective when it becomes law. In the General Assembly read three times and ratified this the 16t` day of June, 2011. s/ Walter H. Dalton President of the Senate s/ Thom Tillis Speaker of the House of Representatives s/ Beverly E. Perdue Governor Approved 1:48 p.m. this 231d day of June, 2011 Page 2 Session Law 2011-256 SL2011-0256 Johnson, Kelly From: Johnson, Kelly Sent: Tuesday, September 12, 2017 9:27 AM To: 'Christina Purcell' Cc: MarkArcuri; Erin.Acton@wellsfargo.com; Gary Owens Subject: RE: SW8 060608, Villages at Turtle Creek - State Stormwater Permit Oh I see... I forgot it was "Villages" at Turtle Creek and didn't recognize the acronym. Mark, I see that you are with SEPI now. Are you the current PE contact for this project, or is it Greg Thompson? I know. that Eric Seidel is no longer there. Christina, I was out there on Friday. I have been talking with the engineers about the construction, and an issue that came up. My supervisor is out today, but I will get her feedback once she returns to the office and then get the report out. Thanks, Kelly From: Christina Purcell [mailto:christina.purcell@gopropertymgt.com] Sent: Tuesday, September 12, 2017 9:15 AM To: Johnson, Kelly <kelly.p.johnson@ncdenr.gov> Cc: Mark Arcuri <MArcuri@sepiengineering.com>; Erin.Acton@wellsfargo.com; Gary Owens <gary.owens@gopropertymgt.com> Subject: Re: VTC Compliance VTC, yes, ma'am! CP On Tue, Sep 12, 2017 at 9:13 AM, Johnson, Kelly<1<elly.p.jolznsonna.ncdenr.gov> wrote: Christina, Is this for Turtle Creek, or is this another project? Thanks, Kelly From: Christina Purcell [mailto:christina.purcell@gopropertymgt.com] Sent: Monday, September 11, 2017 11:23 AM To: Johnson, Kelly <kelly.p.iohnson@ncdenr.gov>; Mark Arcuri <MArcuri@sepiengineering.com>; Erin.Acton@wellsfargo.com; Gary Owens <gary.owens@aopropertymgt.com> Subject: VTC Compliance Good morning, Kelly! The VTC Board president, John Gallagher.., has been presented with paperwork to sign from Mark Arcuri with SEPI, a name change application. For various reasons, before he signs, Mr. Gallagher would like to make sure that everything regarding the project is totally within state compliance. Any information would be much appreciated. CP Christina M. Purcell Association Manager GOProperty Management 910-726-1848(Phone) 910-681-1361(Fax) Christina.Purcel l!q).g npropertpmL,tcnni 1908 Eastwood Rd., Ste 321, Wilmington, NC 28403 www.gopropertymgt.com better association management Christina M. Purcell Johnson, Kelly From: Johnson, Kelly Sent: Tuesday, September 12, 2017 9:27 AM To: 'Christina Purcell' Cc: Mark Arcuri; Erin.Acton@wellsfargo.com; Gary Owens Subject: RE: SW8 060608, Villages at Turtle Creek - State Stormwater Permit Oh I see... I forgot it was "Villages" at Turtle Creek and didn't recognize the acronym. Mark, I see that you are with SEPI now. Are you the current PE contact for this project, or is it Greg Thompson? I know that Eric Seidel is no longer there. Christina, I was out there on Friday. I have been talking with the engineers about the construction, and an issue that came up. My supervisor is out today, but I will get her feedback once she returns to the office and then get the report out. Thanks, Kelly From: Christina Purcell [mailto:christina.purcell@goprope rtymgt.comj Sent: Tuesday, September 12, 2017 9:15 AM To: Johnson, Kelly <kelly.p.johnson@ncdenr.gov> Cc: Mark Arcuri <MArcuri@sepiengineering.com>; Erin.Acton@wellsfargo.com; Gary Owens <gary.owens@gopropertymgt.com> Subject: Re: VTC Compliance VTC, yes, ma'am! CP On Tue, Sep 12, 2017 at 9:13 AM, Johnson, Kelly <kelly_p.iohnsongncdenr.gov> wrote: Christina, Is this for Turtle Creek, or is this another project? Thanks, Kelly From: Christina Purcell [mailto:christina.purcell@gopropertymgt.comj Sent: Monday, September 11, 2017 11:23 AM To: Johnson, Kelly <kellv.P.iohnson@ncdenr.gov>; Mark Arcuri <MArcuri sepiengineering.com>; Erin.Acton@wellsfargo.com; Gary Owens <gary.owens@gopropertymgt.com> Subject: VTC Compliance Compliance Inspection Report Permit: SW8060608 Effective: 01 /10/17 Project: The Villages at Turtle Creek Ph I & II Owner: Redus NC Coastal LLC County: Pander Region: Wilmington Expiration: 07/20/20 Adress: NC 210 And Lodge Hall Rd City/StatelZip: Surf City NC 28445 Contact Person: Chris Williard Title: Vice President Phone: 919-334-2628 Directions to Project: From the intersection of US 17 and NC 210, travel east on NC 210 two (2) miles. Turn left after Lodge Hall Road Type of Project: State Stormwater - HD - Infiltration State Stormwater - HD - Other Drain Areas: 1A1 - (Beckys Creek (Bishops Creek)) (03-06-24 ) ( SA;HQW) 1A2 - (Beckys Creek (Bishops Creek)) (03-06-24 ) ( SA;HQW) 1A3 - (Beckys Creek (Bishops Creek)) (03-06-24 ) ( SA;HQW) 18 - (Beckys Creek (Bishops Creek)) (03-06-24) (SA;HQW) 1C - (Beckys Creek (Bishops Creek)) (03-06-24 ) ( SA;HQW) 1D1 - (Beckys Creek (Bishops Creek)) (03-06-24 ) ( SA;HQW) 1D2 - (Beckys Creek (Bishops Creek)) (03-06-24) (SA;HQW) On -Site Representative(s): Related Permits: Inspection Date: 09108/2017 Entry Time: 10:30AM Primary Inspector: Kelly Johnson Secondary Inspector(s): Reason for Inspection: Follow-up Permit Inspection Type: State Stormwater Facility Status: ❑ Compliant ❑ Not Compliant Question Areas: ■ State Stormwater (See attachment summary) Exit Time: 11:00AM Phone: 910-796-7331 Inspection Type: Compliance Evaluation page: 1 Permit: SW8060608 Owner - Project: Redus NC Coastal LLC Inspection Date: 09/OB/2017 Inspection Type Compliance Evaluation Reason for Visit: Follow-up File Review Yes No NA NE Is the permit active? 0 ❑ ❑ ❑ Signed copy of the Engineer's certification is in the file? El■ n ❑ Signed copy of the Operation & Maintenance Agreement is in the file? ® F] ❑ ❑ Copy of the recorded deed restrictions is in the file? ElN ❑ Comment: Only the pond was inspected. See letter for details SW Measures Yes No NA NE Are the SW measures constructed as per the approved plans? ❑ 11 ON Are the inlets located per the approved plans? 0 Are the outlet structures located per the approved plans? U Comment: This site visit was to compare the design permitted on 1/10/17 with the as -built later submitted in Preparation for additional changes to the pond to correct a design error. Therefore a compliance determination was not made. page: 2 c� G 00 O CA O 01 O 00 -I kD f6 ono V Oq m N d rF C to n IN rD rD X- Johnson, Kelly From: Johnson, Kelly Sent: Friday, September 08, 2017 9:38 AM To: Greg Thompson (GThompson@sepiengineering.com) Subject: FW: SW8 060608, Turtle Creek Your voicemail didn't pick up. If there is a follow up to this email would you please email it to me? Georgette and I are headed up that way today. Hopefully we can figure this out... Thanks, Kelly From: Johnson, Kelly Sent: Friday, September 08, 2017 9:35 AM To: Greg Thompson (GThompson@sepiengineering.com) <GThompson@sepiengineering.com> Subject: FW: SW8 060608, Turtle Creek Greg, I'm going to call you in a minute. Did you submit something following this email? I thought that you did, but I don't see it in the file? H From: Johnson, Kelly Sent: Monday, July 31, 2017 11:53 AM To: 'Greg Thompson' <GThompson@seaiengineeriniz.com> Cc: Sams, Dan <dan.sams@ncdenr.gov>; Georgette Scott <georsette.scott@ncdenr.Rov> Subject: RE: SW8 060608, Turtle Creek Greg, I am still concerned about the pond's failure at the 10yr storm, and so I talked with Dan Sams about it to get his perspective. He suggested that I ask you if the pond would still fail at the 10yr storm under the 2017 rules (which have a different average depth calculation and a smaller SA/DA). Thanks, Kelly Storm Event I Water t i _1 y* 44 hr Elevation 25 61' f L +yr — 2580 260R 10,yr. _­1__ i. Pond rallure ;Ik?O:dy F rhJ-1114on, I'E, PLS i Veloalty (fps) Flow (cfs)� - 0.76 i 1.38._- i�H4.2 _ 2.03 Viet DE'-ntion Basin 5upp!ernent i'^>; p•,r, , i P ,� ','ojtlnq Hydn;ciraphs a Spillway worksl;,:«*r Car 2. 5 yr %ECEIVE RY_ �- From: Greg Thompson[mailto:GThompson@serienginee r':n�.cem] Sent: Tuesday, July 25, 2017 9:22 AM To: Johnson, Kelly <ke&r.'chI nson ncdenrogov> Subject: RE: SW8 060608, Turtle Creek Kelly Failure means that the pond surface will exceed the sides of the pond. Anything above the 1yr storm will go through the emergency overflow. Above or at a 10 year, then the pond is full. It will discharge to the same place as the emergency overflow. The reason the pond went from failure at a 25 yr event to a 10 year event is the increased height of the outlet structure from the elevation values previously considered. The outlet is a little higher which means the difference in elevation from the top of outlet to top of pond is smaller. I don't think anything catastrophic will happen during a normal storm event. Major storm, hurricane or other, then maybe but that would be the case for any system. I hope this helps. Greg Gregory R. Thompson, PE, PLS lAsst. Vice President Site/Civil Department Manager SEPI Engineering & Construction 5030 New Centre Drive, Suite B I Wilmington, NC 28403 Direct: 910.523.5714 1 Cell:910.817.8124 1 sepieneineerine.com Connect with us: Linkedin I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. From: Johnson, Kelly mai?tc_keliv.D.:ohnson!�ncdenr.gov] Sent: Monday, July 24, 2017 1:15 PM To: Greg Thompson Subject: RE: SW8 060608, Turtle Creek G reg, I haven't gone through the revised package yet. But, I am concerned about the "pond failure" situation. The previous submittal (before the survey was corrected) said it would fail at the 25yr storm. This submittal shows it to be at the 10yr storm. What do you mean by "failure"? Does that mean that the pond overflows into the wetland at the 10yr storm? Will it flood? Or, will something catastrophic happen such as the wall will blow out into the wetland again? I am hoping that it is something simple such as an overflow to the wetland... Thanks, Kelly From: Greg Thompson [mailto:GThompson,2 s-!ILn neerinP.cam] Sent: Tuesday, July 18, 2017 5:21 PM To: Johnson, Kelly <kelly.pJohns an@ncdenr.gov> Subject: RE: SW8 060608, Turtle Creek Kelly I am sorry but I will need to revise everything I have previously submitted. The surveyor has informed us that he revised the data and did so the day after I submitted the info to you. Fortunately, I think things should get a little better on performance but it will take me a day or so to pull it all back together. Greg Gregory R. Thompson, PE, PLS I Asst. Vice President Site/Civil Department Manager SEPI Engineering & Construction :5030 New Centre Drive, Suite B I Wilmington, NC 28403 Direct: 910.523.5714 1 Cell:910.817.8124 1 seaiensineerine.com Connect with us: Linkedln I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thankyou. From: Johnson, Kelly mailto:kellyp.johnson@ncdenr.gov] Sent: Tuesday, July 18, 2017 10:18 AM To: Greg Thompson Subject: SW8 060608, Turtle Creek Greg, Three things: 1. Will you please send me this table (Excel attached)? I am not seeing 56,065cf for PP, but hopefully that is because there is more data/more layers? I also need to document the forebay's data for the file. 2. 1 have attached the revised draft permit. I changed out the numbers, and I also updated the cover page. Also, I see that the pond will fail at the 25yr storm. Have you talked with Pender County about that? The State doesn't regulate flooding because we don't have any regulatory authority to do so. I don't have any recourse to do anything about it, but I don't feel really good about it either.... Whole Pond = Main + Forebay Main Pond For Elev (msl) Area (ft') Inc. Volume (ft3) Cum. Volume (ft3) Elev (msl) Area (ftz) Inc. Volume (ft3) Cum. Volume (ft3) Elev (msl) Area \ (ftz) Bottom Pond/Bottom Excavation: 17.00 1 0 0 0 17.00 Bottom Pond/Top Sediment: 18.00 3,622 0 0 18.00 Bottom Shelf: 22.40 15,463 41,987 41,987 22.40 Permanent Pool: 22.75 16,509 5,595 47,582 22.75 Temporary Pool: 25.40 23,108 52,493 100,075 25.40 PP: 47,582 ft3 TP: 52,493 ft3 Thanks, Kelly FCeI.I.( lOkA,SDvu Kelly Johnson Environmental Engineer NC Division of Energy, Mineral and Land Resources Stormwater Permitting 127 Cardinal Drive Extension Wilmington, NC 28405-3845 Phone: 910.796.7331 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. 4 DATE: 8/22M7 TIME: 7:56 AM Villages at Turtle Creek Homeowners Assoc. Page: 1 OWNER REPORT WITH MORTGAGE COMPANY AS OF 08/22/17 (H)=Current Owner (P)=Prev Owner (R)=Resident/Tenant (V)=Developer (*)=No Owner iocief N- R1tOPE1tTYADdIt $S llfrNNIT . BETrt.E� AUWAW YRTG MNMOAGEC.O:t9AM 1001 102 East Stockton Place 1 $85.00 Timothy & Juliann Belliveau (H) 09/18/07 000 1002 104 East Stockton Place 2 $85.00 Steven Pasquantonio (Michael Pasquantonio) (H) 06/12108 000 1506 Easy Street; Surf City, NC 28445 1003 106 East Stockton Place 3 $85.00 Grayson & Emily Story (H) 06/26/09 000 7704 S. West Shore Blvd; Tampa, FL 33616-2224 1004 108 East Stockton Place 4 $85.00 Samuel & Abby Land (H) 06/06/17 000 1005 110 East Stockton Place 5 $85.00 Ralph & Ted Tierney (H) 09/23/09 000 1006 112 East Stockton Place 6 $85.00 Daniel & Amy Woolard (H) 09/20/13 000 1007 114 East Stockton Place 7 $85.00 John Paul Cruz (H) 04/18/13 000 1008 116 East Stockton Place 8 $85.00 Thomas & Susanne Lankford (H) 08/14/08 000 1009 118 East Stockton Place 9 $85.00 Jennipher Love (H) 11/04/11 000 147 McNeill Rd; Rockingham, NC 28379 1010 120 East Stockton Place 10 $85.00 Marian Chuda (H) 000 32 Darting Avenue; Bloomfield, NJ 07003 1011 122 East Stockton Place 11 $85.00 John & Sheryl Armour (H) 10/01/07 000 1012 120 Leyland Way 12 $85.00 William & Theresa Harris (H) 05/20/08 000 4524 Devonshire Blvd; Palm Harbor, FL 34685 1013 122 Leyland Way 13 $85.00 Daniel & Suzanne Haas (H) 03/12/14 000 1014 124 Leyland Way 14 $85.00 Bryan & Kelly Padgett (H) 04/28/11 000 PO Box 2883; Surf City, NC 28445-0047 -71 °GATE: '8/22/17 TIME: 7:56 AM Villages at Turtle Creek Homeowners Assoc. Page: 2 OWNER REPORT WITH MORTGAGE COMPANY AS OF 08/22/17 (H)=Current Owner (P)=Prev Owner (R)=Resident/Tenant (V)=Developer (*)=No Owner ACCOUNT NO PROPERTY ADDRESS LOT)UNIT SEi'M ASSM7 MT MUG CODE MORTGAGE CO. NAME 1015 126 Leyland Way 15 $85.00 Chad & Maggie Tompkins Jr. (H) 04/05/11 000 133 Leeward Lane; Unit 21); Hampstead, NC 28443 1016 127 Leyland Way 16 $85.00 Stephen & Suzanne Allenbach (H) 000 1411 Wake Road; Coronado, CA 92118 1017 125 Leyland Way 17 $85.00 Danielle Bumash (H) 07/10/17 000 1018 123 Leyland Way 18 $85.00 James & Dawn Ellis (H) 06/26/08 000 1019 121 Leyland Way 19 $85.00 Richard & Deirdre Petersen (H) 03/27/08 000 1020 119 Leyland Way 20 $85.00 Robert & Heidi Radka (H) 02/28/08 000 1355 Crawford Dairy Rd; Pittsboro, NC 27312 1021 111 Leyland Way 21 $85.00 Aime Ahrens (H) 07/17/08 000 1022 115 Leyland Way 22 $85.00 Joseph & April Tome (H) 09/05/13 000 48 Amy Drive; Sayville, NY 11782 1023 113 Leyland Way 23 $85.00 Scott Dulebohn (H) 03/23/17 000 1024 111 Leyland Way 24 $85.00 Mike & Barbara Langdon (H) 12128107 000 1027 102 Leyland Way 27 $85.00 John & Ann Lawson (H) 07/23/15 000 1028 104 Leyland Way 28 $85.00 Matthew & Julie Capodanno (H) 05/15/08 000 2588 Belmont Stakes Dr; Virginia Beach, VA 23456 1029 106 Leyland Way 29 $85.00 John & Carolyn Gallagher (H) 05/08/08 000 1030 108 Leyland Way 30 $85.00 Kiet Anh Nguyen (H) 12/07/07 000 1031 110 Leyland Way 31 $85.00 Brencent & Charquise Berry (H) 01/23/15 000 DATE: 1/22/17 TIME: 7:56 AM Villages at Turtle Creek Homeowners Assoc. OWNER REPORT WITH MORTGAGE COMPANY AS OF 08/22/17 (H)=Current Owner (P)=Prev Owner (R)=Resident/Tenant (V)=Developer (*)=No Owner ACCOUNT NO PROPERTY ADDRESS LOTANUr Iiunm ASSMT AWr MRTG CODE MORTGAGE CO. NAME 1032 109 East Stockton Place 32 $85.00 Bradley & Rachael Pierce (H) 04/24/08 000 CMR 480 # 2796; APO, AE 09128-0028 1033 107 East Stockton Place 33 $85.00 Stacey Tate (H) 04/13/11 000 4201 Auke Lane; Juneau, AK 99801-8619 1034 105 East Stockton Place 34 $85.00 Leslie McColry (H) 11/01/16 000 1035 103 East Stockton Place 35 $85.00 Justin & Sierra Smallwood (H) 08/31/11 000 3511 Patrick Road; Panama City, FL 32409-4296 1036 101 East Stockton Place 36 $85.00 Charles Aaron Poulton (Fabianna Antonia Seri) (H) 06/30/16 000 1037 204 Loggerhead Boulevard 37 $85.00 Judy Smith (H) 09/15/11 000 1038 206 Loggerhead Boulevard 38 $85.00 Cory & Shannon Udler (H) 07/28/17 000 1039 207 Loggerhead Boulevard 39 $85.00 James & Leah Coll (H) 07/08/10 000 3315 Roundtree Ct; Raleigh, NC 27607-6513 1040 209 Loggerhead Boulevard 40 $85.00 Brian & rAisty LaPointe (H) 02/13/12 000 1041 211 Loggerhead Boulevard 41 $85.00 Brent & Lauren Harrell (H) 05/18/16 000 1042 213 Loggerhead Boulevard 42 $85.00 James & Margaret Stewart (H) 09/09108 000 1043 215 Loggerhead Boulevard 43 $85.00 Michael & Erin McMillan (H) 09/11/08 000 10209 Acworth Ct; Glen Allen, VA 23060-3003 1044 217 Loggerhead Boulevard 44 $85.00 Gregory & Joni Kane (H) 03/01/12 000 1045 219 Loggerhead Boulevard 45 $85.00 Leif & Summer Landa (H) 01/09/14 000 103526 W. Old Inland Empire HW; Prosser, WA 99350 1046 460 Landsdowne Circe 46 $85.00 Robert & Michele Kosinski (H) 07/13/12 000 Page: 3 DATE: 18/22117 TIME: 7:56 AM Villages at Turtle Creek Homeowners Assoc. Page: 4 OWNER REPORT WITH MORTGAGE COMPANY AS OF 08/22/17 (H)=Current Owner (P)=Prev owner (R)=Resident/Tenant (V)=Developer (*)=No Owner ACCOUNT NO PROPERTY ADDRESS LOTAMIff strn.91) ASSMT AMT uRTO CODE MORTGAGE CO NAME 1047 462 Landsdowne Circle 47 $85.00 Bernard & Marie Ogrodnik (H) 000 1048 464 Landsdowne Circle 48 $85.00 Jayson Rebimbas (H) 000 103 Bdford Asnue; Iselin, NJ 08830 1049 468 Landsdowne Circle 49 $85.00 James & Samantha Seymour (H) 06/20/13 000 5302 Brownway St; Houston, TX 77056 1050 470 Landsdowne Circle 50 $85.00 Harry & Audrey Phelps (H) 01/28/14 000 1051 472 Landsdowne Circle 51 $85.00 Andrew & Tamara Schmidt (H) 01/21114 000 1052 474 Landsdowne Circle 52 $85.00 Jason & Jamie Ballman (H) 000 1053 476 Landsdowne Circle 53 $85.00 Alessandra Taylor (Sandy) (H) 10/18/12 000 1054 478 Landsdowne Circle 54 $85.00 Sam & Kathleen Riley (H) 04101/15 000 1055 482 Landsdowne Circle 55 $85.00 Lee & Nicole Fortenberry (H) 06/30115 000 1056 484 Landsdowne Circle 56 $85.00 Gregory and Emily Law (H) 07/02115 000 1057 486 Landsdowne Circle 57 $85.00 John & Janet Tedrow (H) 07/13/12 000 1058 483 Landsdowne Circle 58 $85.00 Corda Johnson (H) 07/18/14 000 1059 401 Landsdowne Circle 59 $85.00 John & Anna Feeley (H) 02126/14 000 1060 409 Landsdowne Circle 60 $85.00 Steven & Trista Leach (H) 07/24/14 000 1061 481 Landsdowne Circle 61 $85.00 Andrew Kelly (Alyson Hooper) (H) 05/30/14 000 1062 417 Landsdowne Circle 62 $85.00 David & Debbie Stem (H) 06/24/13 000 DATE: 18/22/17 TIME: 7:56 AM Villages at Turtle Creek Homeowners Assoc. OWNER REPORT WITH MORTGAGE COMPANY AS OF 08122/17 (H)=Current Owner (P)=Prev Owner (R)=Resident/Tenant (V)=Developer (")=No Owner ACCOUNT NO PROPERTY ADDRESS LOTANUT 3M1.E0 ASSMT ANT NRTG CODE MORTi11A aN CO. NAME 1062 417 Landsdowne Circle 62 $85.00 6620 Shire Lane; Wilmington, NC 28411 1063 479 Landsdowne Circle 63 $85.00 Mark McGrady (H) 07126/17 000 1064 425 Landsdowne Circle 64 $85.00 Edward & Donna Masciandaro (H) 12/19/13 000 15 Lorene Street; Little Ferry, NJ 07643 1065 477 Landsdowne Circle 65 $85.00 Andrew & Brooke Desmond (H) 05/25/12 000 1066 433 Landsdowne Circle 66 $85.00 Jessie & Penny Bradshaw (Matt) (H) 02106/14 000 1067 475 Landsdowne Circle 67 $85.00 David & Dianne Mahoney (H) 07/24/14 000 1068 441 Landsdowne Circle 68 Richard & Patricia McFann (H) 10/24/12 000 1069 473 Landsdowne Circle 69 $85.00 Wayne & Janice Jeno (H) 05/24/16 000 1070 449 Landsdowne Circle 70 $85.00 Jonathan & Valerie Ford (H) 000 1071 469 Landsdowne Circle 71 $85.00 Nicholas & Melissa Johnson (H) 06113/13 000 1072 467 Landsdowne Circle 72 $85.00 Timothy Branche (Jennifer Branche) (H) 06/13/17 000 1073 457 Landsdowne Circle 73 $85.00 Anthony & Ashley Skrypek (H) 000 TOTAL PROPERTIES LISTED: 71 TOTAL ASSESSMENT AMOUNT: $6,035.00 Page: 5 With adjustments to the current box, where three 2' rectangular weirs are cut to a crest elevation of 25.00' (6.24 inches from the top), the 2, 5, and 10 year storms will flow through the emergency spill way. The top of the pond will be reached at a 25 year event. Storm Event Water Elevation Velocity (fps) Flow (cfs) 1 yr 24 hr 25.29' No Flow No Flow 2 yr 25.67' 0.67 1.08 5 yr 25.94' 1.54 12.03 10 yr 26.10' 1.90 21.9 25 yr Pond Failure I Irl" AUG p 3 2�17 BY: Johnson, Kelly From: Greg Thompson <GThompson@sepiengineering.com> Sent: Friday, September 08, 2017 9:58 AM To: Johnson, Kelly Subject: FW: Turtle Creek Stormwater Revised Table Attachments: Revised Table For Narrative.docx; ATT00001.htm Gregory R. Thompson, PF, PLS lAsst. Vice p e dent Municipal Engineering Department Manager SE PI Engineering & Construction 5030 New Centre Drive, Suite 5 1 Wilmington, NC 23403 Direct: C10.523.5714 j Cell: 9=G.8i7.S1_4 1 sepieneineering.com Connect with us: Linkedlr, I :_�zitt:2r I _aSLOLX Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. From: Greg Thompson Sent: Thursday, August 3, 2017 9:07 AM To: kelly.p.johnson@ncdenr.gov Subject: Fwd: Turtle Creek Stormwater Revised Table Kelly Please look at the attached. The outlet structure would need to be modified slightly to expand pond capacity. Take a look and let me know what you would like to do. G reg Sent from my Wad Begin forwarded message: From: Ben Tyner <�ner a s.? iq_ neerinn.cc,n> Date: August 3, 2017 at 9:00:52 AM EDT To: Greg Thompson <GThom�scn r-sepie 2, Mm ering.cor Subject: Turtle Creek Stormwater Revised Table Greg, Here is the new table. Let me know if this needs to be edited into a new edition of the narrative or if it is fine by itself. Ben SEPI I CONSTRUCTION 'transmittal Letter To: NCDEQ 127 Cardinal Dr. Ext Wilmington, NC 28406 Attention: Kelly 7ohnson From: Gregory R Thompson, PE, PLS SEPI Engineering & Construction Subject: The Villages at Turtle Creek SW8 060608 We are sending you: ❑ Shop Drawings ❑ Specifications ❑ Contracts ❑ Prints ® Copy of Letter ❑ Invoice SEPI Engineering & Construction, Inc. 5030 New Centre Drive I Suite B I Wilmington, NC 28403 Main: 910.523.5715 1 Fax: 910.523.5716 sepiengineering.com Date: July 20, 2017 Copies: n/a VIA: Delivery Method er. zo '0#7 Rimy SEPI Project Number: SC16.015 ® Plans ❑ Samples ❑ Change Order ❑ Reports Copies Date Description 1 07-19-17 As -Built Performance Narrative 1 07-19-17 Wet Detention Basin Supplement 1 07-18-17 Data Table A and Data Table B 1 07-19-17 Pre/Post & Pond Hydrographs + Spillway Worksheets for 1,2, 5 yr 2 07-19-17 Drawing Sheet ile-2.1 (new As -Built) ; C-3.0 details (Replacement) Comments: If you have any questions or need additional information, please contact me at 910.523.5714 or email athompson@sepiengineering.coi Sincerely, Gregory R. Thompson, PE, PLS v `r Signed: age: 1/ 1 Celebrating 15 Years Sor 111011111h EPI ENGINEERING& CON2TaUCT10N July 19, 2017 I Permit Modification and Extension SW8 060608 The Villages at Turtle Creek Phase I & II High Density Subdivision Wet Pond and Infiltration Basin Project As -Built Performance Narrative. The wet pond constructed in the Turtle Creek subdivision was completed and has been evaluated for performance. The pond will accept and hold the 1.5 inch runoff volume. Asbuilt elevations and contours were provided by ESP Associates, pond asbuilt drawings dated 6/30/17. Photos from June 23, 2017 Site Inspection As constructed the pond has an outlet structure with a 3 inch orifice set at 22.75' (Permanent Pool) and a 4'x4' grated opening top set at 25.52'. Flow is discharged through a 42" corrugated plastic pipe. The forebay transition weir is constructed with granite riprap and has been substantially armored. neCEIVIE JUL z o zon D 5030 New Centre Drive I Suite B I Wilmington, NC 128403 1 Phone: 910.523.5715 1 Fax: 910.523.5716 1 sepiengineering.com I @SEPlengineers SEPI The top of the pond berm is at approximately 26.12' with a riprap lined emergency overflow with a crest elevation set at 25.60'. The pond will discharge through the emergency overflow for storm events starting at a 1 year 24 hour event. The following table represents the pond elevation, discharge velocities and flow through the emergency overflow at specific storm events. Storm Event Water Elevation Velocity (fps) Flow (cfs) 1 yr 24 hr 25.61' 0.76 1.58 2 yr 25.80' 1.38 8.92 5 yr 26.08' 2.03 26.14 10 yr Pond Failure Gregory R Thompson, PE, PLS Attachments: &31-7 Revised Wet Detention Basin Supplement Pre/Post & Pond Routing Hydrographs & Spillway Worksheets for 1 yr 2 yr 5 yr ° ECEIVE'4 JUL 10 20t 8Y: Fa Permit No. (to be provided by DWQ) STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be fified out, printed and submitted. The Required items Checklist (Part llil must be printed, filled out and submitted along with all of the required information. 1. PRDJECT MRMATION Project name Contact person Phone number 910-523.5715 Data 7/19/2017 Drainage area number 4 Turtle Creek Greg Thompson .moo?�F WAT�9Q� o N. DES= INFOMI'ICN Site Characteristics Drainage area 752,249 fe Impervious area, post -development 339,953 fe % impervious 45.19 % Design rainfall depth 3.7 in Storage Volume: Non -SA Waters Minimum volume required ff3 Volume provided ft3 Storage Volume: SA Waters 1.5" runoff volume 42,494 ft3 Pre -development 1-yr, 24-hr runoff 7,729 ff Post -development 1-yr, 24-hr runoff 96,943 fe Minimum volume required 89,214 ft3 Volume provided 54,423 fe Insufficient. Increase volume provided. Peak Flow Calculations Is the prelpost control of the lyr 24hr storm peak flow required? N (Y or N) 1-yr, 24-hr rainfall depth 3.7 in Rational C, pre -development 0.25 (unkless) Rational C, post -development 0.57 (unkless) Rainfall intensity: 1 -yr, 24-hr storm 0.16 in/hr OK �, E �vE Pre -development 1-yr, 24-hr peak flow 4.15 fe/sec Post -development 1-yr, 24-hr peak flow Pre/Post 26.47 ft3/sec JUL 0 20t7 1-yr, 24-hr peak flow control 22.32 fe/sec.. Elevations Temporary pod elevation 25.52 fmsl BY: Permanent pool elevation 22.75 fmsl SHWT elevation (approx. at the perm. pool elevation) 23.41 fmsl Top of 1 Oft vegetated shelf elevation 23.40 fmsl Bottom of 1 Oft vegetated shelf elevation 22.40 fmsl Data not needed for calculation option #1, but OK if provided. Sediment cleanout, top elevation (bottom of pond) 17.00 fmsl Sediment cleanout, bottom elevation 16.00 fmsl Data not needed for calculation option #1, but OK if provided. Sediment storage provided 1.00 ff Is there additional volume stored above the state -required temp. pool? Y (Y or N) Elevation of the top of the additional volume 25.5 fmsl OK Form SW401-Wet Detention Basin-Rev.9-4/18/12 Parts I. & II. Design Summary, Page 1 of 2 Permit (to be provided by D WQ) II. D IGN1 INFOINATION Surface Areas Area, temporary pool 23,386 fe Area REQUIRED, permanent pool 25,200 ftz SAIDA ratio 3.35 (unitless) Area PROVIDED, permanent pool, Ai a,,,yw 15,909 if Insufficient permanent pool surface area Area, bottom of 1 Oft vegetated shelf, Ab.L h ff 15,653 fe Area, sediment deanout, top elevation (bottom of pond), Ab tl d 3,763 f( Volumes Volume, temporary pool 54,423 ft3 OK Volume, permanent pool, Vp,.,d 58,827 ft3 Volume, forebay (sum of forebays if more than one forebay) 3,632 ft3 Forebay % of permanent pool volume 6.2% % Insufficient forebay volume. SAIDA Table Data Design TSS removal 85 % Coastal SAIDA Table Used? Y (Y or N) Mountain/Piedmont SAIDA Table Used? N (Y or N) SAIDA ratio 3.35 (unidess) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10-2b) Y (Y or N) Volume, permanent pool, V a n_pw 58,827 tf Area provided, permanent pod, Apwm_pw 15,909 ft Average depth calculated 3.70 ft OK Average depth used in SAIDA, dw (Round to nearest 0.5ft) 4.0 ft Insufficient. Check calculation. Calculation option 2 used? (See Figure 10-2b) N (Y or N) Area provided, permanent pool, Ap,,,,,_pw 15,909 ft? Area, bottom of 1 Oft vegetated shelf, Abd 15,653 ftl Area, sediment deanout, top elevation (bottom of pond), Ab k d 3,763 f? "Depth" (distance b/w bottom of 10ft shelf and top of sediment) 5.40 It Average depth calculated 6.55 it OK Average depth used in SAIDA, dw„ (Round to down to nearest 0.5ft) 6.5 It OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 3.00 in Area of orifice ('If -non -circular) in, Coefficient of discharge (CD) 0.60 (unifless) Driving head (Hj 0.76 ft Drawdown through weir? N (Y or N) Weir type (unitless) Coefficient of discharge (Cw) (unitless) Length of weir (L) ft Driving head (H) ft Pre -development 1-yr, 24-hr peak flow 4.15 ft3/sec Post -development 1-yr, 24-hr peak flow 26A7 ft3/sec Storage volume discharge rate (through discharge orifice or weir) 0.21 ft3/sec Storage volume drawdown time 2.39 days OK, draws down in 2,5 days. Additional Information Vegetated side slopes Vegetated shelf slope Vegetated shelf width Length of flowpath to width ratio Length to width ratio Trash rack for overflow & orifice? Freeboard provided Vegetated filter provided? Recorded drainage easement provided? Capures all runoff at ultimate build -out? Drain mechanism for maintenance or emergencies is: �ECEIVE JUL 7 0 2017 f�Y• 3 :1 OK " 3 :1 Insufficient shelf slope. 3.0 ft Insufficient shelf length. n/a :1 OK We :1 OK Y (Y or N) OK 0.6 ft Insufficient freeboard, minimum of 1-ft required Y (Y or N) OK Y (Y or N) OK Y (Y or N) OK Pump Form SW401-Wet Detention Basin-Rev.94/18/12 Parts I. & It. Design Summary, Page 2 of 2 Data Table A Wet Pond 1B Permitted 1/10/17 Corrected 7/18/17 Elevation, Permanent Pool, fmsl: 22.91 22.75 Elevation, Temporary Pool, fmsl: 25.40 25.52 Area, Perm Pool, fe: 17,497 15,909 Area, Tem .Pool, ft2: 24,093 23,386 Volume Provided(Temp Pool), ft'`: 51,780 54,423 Volume Provided (Forebay), ft : 16,888 3,632 $ � � Ln k 0 m 0 0 0 0 g g 0 ] ] ] =r o o J 0 CL CL % ° 0 o C § . m \ � .. � E � � � � 4 p M % .0,B k (n ° IQ d 0 o w 7 w D 00 o& m 0) 0. w I w -4 11 < t $ 2 A ] p + # 0 0 0 0 o a @ ® In In < o n � A o 0 0 0 � IQ ro -4 % E k d k k E < � 1-4 7 w � > w L w @ # -4 M o # m @ -Ph ■ w w W. :3 / v < A Ob\ 0 Ool f - 2 w k < 2 W0 0 o 10 m K < d P- oo � kk/w/ Ln o % < � $ $ w 4 3 r-i 00 1-1 00 M 'OPo 14l n §Q nL_PN, 9 | 0 0 m $ Hydrograph Report 1 Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. v10.5 Wednesday, 07 / 19 / 2017 Hyd. No. 1 SCS Pre-Dev Hydrograph type = SCS Runoff Peak discharge = 4.149 cfs Storm frequency = 1 yrs Time to peak = 732 min Time interval = 1 min Hyd. volume = 26,734 cuft Drainage area = 17.269 ac Cul-Ve number = 55 Basin Slope = 0.0 % Hydraulic length = Oft Tc method = User Time of conc. (Tc) = 25.00 min Total precip. = 3.73 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Pre-Dev Q (cfs) Hyd. No. 1 — 1 Year Q WS) 5.00 5.00 4.00 4.00 3.00 3.00 2.00 2.00 1.00 1.00 0.00 n nn 0 120 240 360 480 600 720 840 Hyd No. 1 960 1080 1200 1320 1440 1560v vv E EQVE Time (min) JUL 2 0 2017 RY:�— 2 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. v10.5 Wednesday, 07 / 19 / 2017 Hyd. No. 2 SCS Post-Dev Hydrograph type = SCS Runoff Peak discharge = 26.47 cfs Storm frequency = 1 yrs Time to peak = 729 min Time interval = 1 min Hyd. volume = 96,191 cuft Drainage area = 17.269 ac Curve number = 76 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 25.00 min Total precip. = 3.73 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Post-Dev Q (cfs) Hyd. No. 2 -- 1 Year Q (Cfs) 28.00 24.00 20.00 16.00 12.00 8.00 4.00 0.00 28.00 24.00 20.00 16.00 12.00 8.00 4.00 0 00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 — Hyd No. 2 Time (min) Hydrograph Report 3 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Wednesday, 07 / 19 / 2017 Hyd. No. 3 Routed Pond Hydrograph type =Reservoir Peak discharge = 2.232 cfs Storm frequency = 1 yrs Time to peak = 818 min Time interval = 1 min Hyd. volume = 69,673 cuft Inflow hyd. No. = 2 - SCS Post -rev Max. Elevation = 25.61 ft Reservoir name = Final Pond Routing Max. Storage = 56,713 cuft Storage Indication method used. Q (cfs; 28.00 24.00 20.00 iiM- 04 12.00 M M1111 Routed Pond Hyd. No. 3 --1 Year F0""'. N 70IN! JU!'.. 2 0 '1017 Q (cfs) 28.00 0.00 0 24.00 20.00 16.00 12.00 M 4.00 oT.r.'s 300 600 900 1200 1500 1800 2100 2400 2700 3000 Hyd No. 3 - Hyd No. 2 ® Total storage used = 56,713 cuft Time (min) Hydrograph Report 4 Hydraflow Hydrographs Extension for AutoCAD® Civil 31382016 by Autodesk, Inc. 00.5 Hyd. No. 1 SCS Pre-Dev Hydrograph type = SCS Runoff Peak discharge Storm frequency = 2 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 17.269 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 4.52 in Distribution Storm duration = 24 hrs Shape factor M . iM 4.00 M SCS Pre-Dev Hyd. No. 1 -- 2 Year Wednesday, 07 / 19 / 2017 = 9.575 cfs = 731 min = 47,106 cuft = 55 = Oft = 25.00 min = Type II = 484 Q (cfs) 10.00 M .Ii 4.00 2.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) Hydrograph Report 5 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. A 0.5 Wednesday, 07 / 19 / 2017 Hyd. No. 2 SCS Post-Dev Hydrograph type = SCS Runoff Peak discharge = 37.53 cfs Storm frequency = 2 yrs Time to peak = 728 min Time interval = 1 min Hyd. volume = 134,511 cuft Drainage area = 17.269 ac Curve number = 76 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 25.00 min Total precip. = 4.52 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Post-Dev Hydrograph Report 6 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. v10.5 Wednesday, 07 / 19 / 2017 Hyd. No. 3 Routed Pond Hydrograph type = Reservoir Peak discharge = 14.84 cfs Storm frequency = 2 yrs Time to peak = 747 min Time interval = 1 min Hyd. volume = 107,859 cuft Inflow hyd. No. = 2 - SCS Post-Dev Max. Elevation = 25.80 ft Reservoir name = Final Pond Routing Max. Storage = 61,402 cuft Storage Indication method used. Q (cfs) 40.00 30.00 20.00 10.00 Routed Pond Hyd. No. 3 -- 2 Year 300 600 900 1200 1500 1800 2100 2400 2700 Hyd No. 3 Hyd No. 2 ® Total storage used = 61,402 cuft Q (cfs) 40.00 i I 1 1, 20.00 10.00 0.00 3000 Time (min) Hydrograph Report 7 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. 00.5 Wednesday, 07 / 19 / 2017 Hyd. No. 1 SCS Pre-Dev Hydrograph type = SCS Runoff Peak discharge = 21.83 cfs Storm frequency = 5 yrs Time to peak = 730 min Time interval = 1 min Hyd. volume = 89,436 cuft Drainage area = 17.269 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 25.00 min Total precip. = 5.84 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Pre-Dev Q (cfs) Hyd. No. 1 -- 5 Year Q (off) 24.00 20.00 16.00 12.00 8.00 4.00 0.00 24.00 20.00 16.00 12.00 8.00 4.00 0 00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 - Hyd No. 1 Time (min) Hydrograph Report 8 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. v10.5 Hyd. No. 2 SCS Post-Dev Hydrograph type = SCS Runoff Peak discharge Storm frequency = 5 yrs Time to peak Time interval = 1 min Hyd. volume Drainage area = 17.269 ac Curve number Basin Slope = 0.0 % Hydraulic length Tc method = User Time of conc. (Tc) Total precip. = 5.84 in Distribution Storm duration = 24 hrs Shape factor Q (cfs) 60.00 50.00 U11 1111 30.00 20.00 i[Ia1r SCS Post-Dev Hyd. No. 2 -- 5 Year Wednesday, 07 / 19 / 2017 = 57.14 cfs = 728 min = 203,260 cuft = 76 = Oft = 25.00 min = Type II = 484 Q (cfs) 60.00 41111I1, 40.00 30.00 20.00 10.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 2 Time (min) Hydrograph Report 9 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. 00.5 Hyd. No. 3 Routed Pond Hydrograph type = Reservoir Peak discharge Storm frequency = 5 yrs Time to peak Time interval = 1 min Hyd. volume Inflow hyd. No. = 2 - SCS Post-Jev Max. Elevation Reservoir name = Final Pond Routing Max. Storage Storage Indication method used. Routed Pond Hyd. No. 3 -- 5 Year 50.00 40.00 30.00 20.00 10.00 Wednesday, 07 / 19 / 2017 = 45.70 cfs = 736 min = 176,440 tuft = 26.08 ft = 68,175 cult Q (cfs) 60.00 4i 1* 40.00 30.00 K111I17 10.00 0.00 1 1 1 1 1 _ i I i I -+.-.. '- 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 — Hyd No. 3 Hyd No. 2 1 Total storage used = 68,175 cult Time (min) Worksheet for 1-yr Spillway Project Description Solve For Discharge Input Data Headwater Elevation 25.61 ft Crest Elevation 25.52 ft Tailwater Elevation 0.00 ft Crest Surface Type Gravel Crest Breadth 20.00 ft Crest Length 23.00 ft Results Discharge 1.58 ft3/s Headwater Height Above Crest 0.09 ft Tailwater Height Above Crest -25.52 ft WeirCoefficient 2.54 US Submergence Factor 1.00 Adjusted Weir Coefficient 2.54 US Flow Area 2.07 ftz Velocity 0.76 ft/s Wetted Perimeter 23.18 ft Top Width 23.00 ft Bentley Systems, Inc. Haestad Methods SoIVSWKlpiieiwMaster VBi (SELECTseries 1) [08.11.01.031 7/19/2017 3:62:26 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Worksheet for 2-yr Spillway Project Description Solve For Discharge Input Data Headwater Elevation 25.80 ft Crest Elevation 25.52 ft Tailwater Elevation 0.00 ft Crest Surface Type Gravel Crest Breadth 20.00 ft Crest Length 23.00 ft 'Results Discharge 8.92 ft'/s Headwater Height Above Crest 0.28 ft Tailwater Height Above Crest -25.52 ft Weir Coefficient 2.62 US Submergence Factor 1.00 Adjusted Weir Coefficient 2.62 US Flow Area 6.44 ft2 Velocity 1.38 ft/s Wetted Perimeter 23.56 ft Top Width 23.00 ft Bentley Systems, Inc. Haestad Methods SolOhM NikowMaster V8i (SELECTseries 1) 108.11.01.03] 7/19/2017 3:54:44 PM 27 Slemons Company Drive Suite 200 W Watertown, CT 06796 USA +1-203-755-1666 Page 1 of 1 Worksheet for 5-yr Spillway Project Description Solve For Discharge !Input Data Headwater Elevation 26.08 ft Crest Elevation 25.52 ft Tailwater Elevation 0.00 ft Crest Surface Type Gravel Crest Breadth 20.00 ft Crest Length 23.00 ft Results Discharge 26.14 ft3/s Headwater Height Above Crest 0.56 ft Tailwater Height Above Crest -25.52 ft Weir Coefficient 2.71 US Submergence Factor 1.00 Adjusted Weir Coefficient 2.71 US Flow Area 12.88 ft2 Velocity 2.03 ft/s Wetted Perimeter 24.12 ft Top Width 23.00 ft Bentley Systems, Inc. Haestad Methods SoldNotMpilewMaster V8i (SELECTseries 1) [08.11.01.03] 7119/2017 3:64:61 PM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 LO N �i I0 a co co `o 0 0 C 7 Ir U3 U co 9 v V m 'O N O am O N HO W J�D 0 0 0 0 0 M N O Co 6 Johnson, Kelly From: Johnson, Kelly Sent: Tuesday, July 18, 2017 10:37 AM To: 'erin.acton@wellsfargo.com' Cc: Greg Thompson (GThompson@sepiengineering.com) Subject: RE: SW8 060608, Villages at Turtle Creek - Stormwater Attachments: Reg ulations_Transfer 1st Transfer Law_SL2011-256_2011_to HOAs.pdf Erin, I have attached the law that requires the common areas to be deeded to the HOA in order for the permit to be transferred to the HOA. I am not sure why they would not want to be deeded the common areas? It seems to be a moot point? The permit responsibilities fall on the permittee until the permit is transferred regardless of who owns the land. And, per the attached law,.the project has to be in compliance in order to transfer it to the HOA. That means that DEMLR has to do an inspection to transfer the permit. Also, FYI, I met with Greg last week because they found some design data that needed to be corrected while they were certifying the pond. I don't think it is going to be a big deal. But, we are going to have to issue a correction. Thanks, KJ From: erin.acton@wellsfargo.com[mailto:erin.acton@wellsfargo.comj Sent: Tuesday, July 18, 2017 8:59 AM To: Johnson, Kelly <kelly.p.johnson@ncdenr.gov? Subject: RE: SW8 060608, Villages at Turtle Creek - Stormwater Kelly, There are three small common area parcels that are still in the Bank's name. I forwarded your information to the HOA and they do not want these parcels transferred to them until after the inspection of the storm water system. Is this acceptable? 4225 78 5399 0000 4225 78 1489 0000 4225 78 4291 0000 Thank youl Erin M. Acton Real Estate Asset Manager ORE Wholesale Banking , III t-�<,,o Bank,N.A..A. 1 :nd:`=t:r;dent Drive, 10,Floor I hcksonvil'e, FL 3?.202 -i?`,C 13094—.00 i c ; S u4-351.-7.^461 Cell 90.4-349-6934 i Fax 9V-351-.: 3(7)7 erin.actonOwellsfarao.com From: Johnson, Kelly [maltokelly.p.johnson aLncdenr.gov] Sent: Friday, July 07, 2017 12:03 PM To: Acton, Erin M Subject: RE: SW8 060608, Villages at Turtle Creek - Stormwater Erin, I think that the next step that you wanted to do was transfer this. (If that is incorrect please let me know. I have so many of these projects that it is often hard to keep them straight.) If that is the case, then you need to submit a Permit Transfer Application Form, https://deq.r,c.gov/z.bout/divisions/energy-miner-.i-lard-resources/energy-mineral-land- rules stormwater-program/post_coiistruction. There is a list of items in the form that you need to include with it. (Although, it references a lot of regulations and it isn't the easiest to read.) You will need the application, $505, a copy of the recorded deed restrictions, a copy of the common area deeds showing that the HOA owns that land, documentation that the bank/permittee owns less than 50% of the lots in the subdivision (example attached), and copies of the PE certifications for the ponds/infiltration basins. Once we get that, it will be assigned (probably to me), and I will work with the inspector to do the inspection for the transfer. Thanks, Kelly From: erin.acton@wellsfar, o.coin [mas!to erin.actonOvvellsfargo.com] Sent: Friday, July 07, 2017 7:58 AM To: Johnson, Kelly <k=-.lyy•ichnsontz-,)nccienr.,!�;:)v> Subject: RE: SW8 060608, Villages at Turtle Creek - Stormwater Good Morning Kelly, I just wanted to check in with you on this project. Nick Garner of CCRG informed me that his work is completed, and the rest of the process I would need to work with you on. Please provide me with an update and let me know if you need anything additional from me. Thank you! Erin M. Acton Real Estate Asset Manager ORE Wholesale Banking "deli_' :' rcio S_ nk, N.A. I i I nD.—ive, 101` Fluor 1.;ackSonvilie, FL 32-0 l Fax r.0,,.- S :!'.-73G7 erin.acton@wellsfargo.com From: Johnson, Kelly [mailto:kell .p.johnson@ncdenr.aov] Sent: Tuesday, April 04, 2017 2:18 PM To: Acton, Erin M Cc: Nick Garner (nick@ccrgnc.com) Subject: RE: SW8 060608, Villages at Turtle Creek Stormwater Erin, There is a regulation (attached) that says that the State can transfer a State Stormwater permit to an HOA without their signature if the following three conditions are met. Paraphrased: 1.) The HOA owns the common areas where the BMPs are located/maintained. (We will need copies of the deed(s) for the land.) 2.) At least 50% of the lots have been sold. (We typically get a spreadsheet printout such as the attached example.) 3.) The permit is in compliance. (In orderto be in compliance, DEMLR will do an inspection to look at all of the BMPs and the project in general. We will also look for the necessary paperwork such as recorded deed restrictions, O&M agreements on file, and the Designer's Certification for each BMP verifying that the BMPs were installed appropriately.) Once ail of this is in order, you just submit the HOA Name/Ownership Change Form with an original signature by an individual with signature authority and $505. The form will be linked to this website, hittps:Hdeg.nc.goylabout/divisions/energy-mineral-land-resources/energy-mineral-land-perm its!stormwater. permits/forms. The current form is shown right now, but FYI, it is being updated to match regulations that became effective 1/1/17. So, just make sure that you check the webpage to download the latest version when you are ready to execute it. Both the current and the future forms for transferring to HOAs under the conditions listed above are only signed by the outgoing permittee and are not signed by the incoming HOA. (I have cc'd Nick Garner as well since he and I just spoke about this this morning.) Thanks, Kelly From: erin.acton@wellsfargo.com[mailto:erin.acton@wellsfargo.comj Sent: Tuesday, April 04, 2017 1:51 PM To: Johnson, Kelly <kelly.pJohnson@ncdenr.gov> Subject: RE: SW8 060608, Villages at Turtle Creek - Stormwater Kelly, I had a general question about this community. The Bank is in the process of getting the bid for the work on basin 1B approved. Due to the dollar amount I've got to go pretty high up the chain, and it's taking some time. One of the questions an approver brought up — I know we have the HOA's word that they will take the permit into their name once we get the entire storm water system back in compliance — but is there any legal requirement for them to do so since they are the ones operating and using the storm water system? Thank you! Erin M. Acton Real Estate Asset Manager ORE Wholesale Banking %^fell_: Orni , E�nl:, F.A. 11 xndepand Wl, C-i>> :, 1.0i" F aor ].Iac; onville, FL 32202 1,-"AC 00 Tel 904-151-7346 ( Cell 904-349-.59--:A I Fax 90 4-351 367 erin.acton@wellsfaroo.com From: Johnson, Kelly jmailto:keliy.p.johnson@ncdenr.govj Sent: Wednesday, December 14, 2016 11:24 AM To: Matt McDonnell; Christina Purcell; Acton, Erin M Cc: James, Trentt; Nick Garner (nick@ccrgnc.com); Scott, Georgette; Megan O'Hare (mohareftendercountync.gov); Eric Seidel (eseidel a)sep!engineering.com) Subject: SW8 060608, Villages at Turtle Creek - Stormwater All, I have been receiving a lot of inquiries about Turtle Creek lately, and so I wanted to touch base with everyone so that we can hopefully get them addressed. The two main categories of questions are 1.) Maintenance, and 2.) The eroding amenity pond. Maintenance: We have received complaints about the infiltration basins being grown up. We issued an inspection letter asking for maintenance last fall, and I talked to Nick Garner (the maintenance contractor) this morning. He said that they had done that maintenance, but from the pictures from the property managers (example below) it looks like it needs to be done again. I just wanted to let you know that this is intended to be an ongoing maintenance item for the permittee (Wells Fargo) to address, and not just a single occurrence. (I have inserted an excerpt of one of the maintenance agreements below.) I have cc'd Trentt James, the State/DEMLR inspector for that area, so that he is aware. We will schedule an inspection in the near future. Things are pretty backed up right now with the holidays, but it will probably be in January. It may be a good time to re-engage Nick so that the inspection goes smoothly. Eroding Amenity Pond: There is also an eroding amenity pond behind Leyland Way that is beginning to impact property. This pond is not a State Stormwater treatment system, it is simply for amenity purposes. There are no engineering specifications for it, and it isn't even mentioned in the permit text. This appears to be a flooding issue, and so I have cc'd Megan O'Hare with the county. The State does not regulate flooding. Nick Garner has prepared a proposal to fix the problem. An excerpt of that is provided below. (Nick has more details on this that he can provide, but I just wanted to let you know that there is already a maintenance contractor engaged in this.) I also have the modification application from SEPI Engineering (Eric Seidel) in my stack for review to fix that infiltration basin that blew out last year. I hope to get to that fairly soon. Thanks, Kelly Infiltration Basin: 4 .w Alf ME - �� el S �l Jc q . , -'yip••' � x:5 .. Y _ .. .. . . pq L` f:'ti s. x 1 , ti�1'; :fir ,i} �•e� K i ,.. Ti 14C -6ww.*Avm7 "0 . # It. Hai IV. 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M rx4sunng dtaice 1" tv drte:ltlilSC t.'le dry'. 07 J., , : �?nwk s►ra11 he such 11621 d wsli ps'e an ACO=rale k1e, th fc4duts and rm :ud+ly pCrtslta:c uk.a.►I:n '.t�� se+dsrrfrxsts 6ta� lh►+tfc�:rA!rtTam: rlt. __ ?;r►in tb,etrltarittctnt:r-s.11le+,r.^:arE.h�iF.tur r.n+..a•tttar•++tbufil t$:: Irrrtrter.rrrnl un+r and the [rattp;�ssti*�i*5r_. 1 Out the s}stcm t% fu1mg, the sys m swill L:nnxxLA1c1y be rrPA"c i to a:IMI! �.5cu�,ri spc�lfkatronx [t the sys,erli c�ot he lrfwsed w prrSxrt: iu dKst�c: f►rssctnrr:, rrt!scr ,tnrrl'►*atrr c�sro! dcL7ccs =s a:1os►t+d �i?�tt�1C 3H E�� trra�t irc dc+�glrc.i. ail-�'�=. �r! s�r�€# rVc�►n;1Wr ccd The eroding amenity pond is starting to impact property. This is the proposal that Nick Garner prepared a few months ago: Tor VWAV At Tfo rtir Crro3i Ea4xtia# Faam® to*4 P"Pvsrd ROPAIr MAP fe— Uu jDhVLs0vw Kelly Johnson Environmental Engineer NC Division of Energy, Mineral and Land Resources Stormwater Permitting 127 Cardinal Drive Extension Wilmington, NC 28405-3845 Office: 910.796.7331 Fax: 910.350.2004 s QEPI INGINIIRING A CONSTRUCTION Transmittal Letter To: NCDEQ 127 Cardinal Dr. Ext Wilmington, NC 28406 Attention: Kelly Johnson From: Gregory R Thompson, PE, PLS SEPI Engineering & Construction Subject: The Villages at Turtle Creek SW8 060608 We are sending you: ❑ Shop Drawings ❑ Specifications ❑ Contracts ❑ Prints ® Copy of Letter ❑ Invoice SEPI Engineering & Construction, Inc. 5030 New Centre Drive I Suite B I Wilmington, NC 28403 Main: 910.523.5715 1 Fax: 910.523.5716 sepiengineering.com Date: July 17, 2017 Copies: n/a BY: VIA: Delivery Method SEPI Project Number: SC16.015 ® Plans ❑ Samples ❑ Change Order ❑ Reports Copies Date Description 1 07-14-17 As -Built Performance Narrative 1 07-17-17 Wet Detention Basin Supplement 1 07-14-17 Pre/Post & Pond Hydrographs + Spillway Worksheets for 1,2, 5 10 yr 2 07-17-17 Drawing Sheet * 2.1 (new As -Built) ; C-3.0 details (Replacement) Comments: If you have any questions or need additional information, please contact me at 910.523.5714 or email gthompson@sepiengineering.com. Sincerely, Gregory R. Thompson, PE, PLS Signed: Page: 1/1 Celebrating 15 Years SEPI ENOINE"'NO L CONSTRUCTION C F M J'F_ July 14, 2017 JUL 17 7017 Permit Modification and Extension SW8 060608 The Villages at Turtle Creek Phase I & II High Density Subdivision Wet Pond and Infiltration Basin Project As -Built Performance Narrative. The wet pond constructed in the Turtle Creek subdivision was completed and has been evaluated for performance. The pond will accept and hold the 1.5 inch runoff volume. Photos from June 23, 2017 Site Inspection As constructed the pond has an outlet structure with a 3 inch orifice set at 22.75' (Permanent Pool) and a 4'x4' grated opening top set at 25.40'. Flow is discharged through a 42" corrugated plastic pipe. The forebay transition weir is constructed with granite riprap and has been substantially armored. The top of the pond berm is at approximately 26.12' with a riprap lined emergency overflow with a crest elevation set at 25.40'. The pond will discharge through the emergency overflow for storrn events starting at a 1 year 24 hour event. 5030 New Centre Drive I Suite B I Wilmington, NC 126403 1 Phone: 910.523.5715 1 Fax. 910.523.5716 1 sepiengineering.com I @SEPlengineers SEPI The following table represents the pond elevation, discharge velocities and flow through the emergency overflow at specific storm events. Storm Event Water Elevation Velocity (fps) Flow (cfs) 1 yr 24 hr 25.48' 0.72 1.15 2 yr 25.68' 1.38 7.75 5 yr 25.94' 1.99 21.47 10 yr 26.11' 2.32 32.97 25 yr Pond Failure ..•_aM GAROi :'•._ Gregory R Thompson, PE, PILS Attachments: Revised Wet Detention Basin Supplement Pre/Post & Pond Routing Hydrographs & Spillway Worksheets for 1 yr 2 yr 5 yr 10 yr ECEIVEt Hydrograph Report 1 Hydraflow Hydrographs Extension forAutoCAD® Civil 31382016 byAutodesk, Inc. v10.5 Friday, 07 / 1412017 Hyd. No. 1 SCS Pre Hydrograph type = SCS Runoff Peak discharge = 3.971 cfs Storm frequency = 1 yrs Time to peak = 12.22 hrs Time interval = 1 min Hyd. volume = 26,943 cuft Drainage area = 17.269 ac Curve number = 55 Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = KIRPICH Time of conc. (Tc) = 25.42 min Total precip. = 3.73 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Pre Q (Cfs) Hyd. No. 1 — 1 Year 4.00 3.00 KX1111 1.00 11114141 Q (Cfs) 4.00 3.00 2.00 1.00 0.00 0 2 4 6 8 10 12 14 16 18 c 22 24 26 Hyd No. 1 E G E IV E Time (hrs) JUL 17 ZOV BY: Hy.drograph Report 2 Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. v10.5 Friday, 07 / 14 / 2017 Hyd. No. 2 SCS Post Hydrograph type = SCS Runoff Peak discharge = 25.47 cfs Storm frequency = 1 yrs Time to peak = 12.17 hrs Time interval = 1 min Hyd. volume = 96,943 cuft Drainage area = 17.269 ac Curve number = 76 Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = KIRPICH Time of conc. (Tc) = 25.42 min Total precip. = 3.73 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Post Q (C) Hyd. No. 2 -- 1 Year Q (Cfs) 28.00 24.00 20.00 16.00 12.00 8.00 4.00 0.00 28.00 24.00 20.00 16.00 12.00 8.00 4.00 0 00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Hyd No. 2 Time (hrs) Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. v10.5 Hyd. No. 3 Routed Pond Hydrograph type = Reservoir Peak discharge Storm frequency = 1 yrs Time to peak Time interval = 1 min Hyd. volume Inflow hyd. No. = 2 - SCS Post Max. Elevation Reservoir name = Final Pond Max. Storage Storage Indication method used. Routed Pond 3 Friday, 07 / 14 / 2017 = 2.937 cfs = 13.18 hrs = 72,321 cult = 25.48 ft = 53,584 cuft Q (cfs) Hyd. No. 3 -- 1 Year Q (cfs) 28.00 — -- 28.00 24.00 24.00 20.00 20.00 16.00 16.00 12.00 12.00 8.00 8.00 4.00 4.00 0.00 - - I i 10.00 0 5 10 15 20 25 30 35 40 45 50 Time (hrs) Hyd No. 3 Hyd No. 2 ® Total storage used = 53,584 cult Hydrograph Report 4 Hydraflow Hydrographs Extension for AutoCAD® Civil 3130 2016 by Autodesk, Inc. v10.5 Friday, 07 / 14 / 2017 Hyd. No. 1 SCS Pre Hydrograph type = SCS Runoff Peak discharge = 9.159 cfs Storm frequency = 2 yrs Time to peak = 12.20 hrs Time interval = 1 min Hyd. volume = 47,474 cuft Drainage area = 17.269 ac Curve number = 55 Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = KIRPICH Time of conc. (Tc) = 25.42 min Total precip. = 4.52 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 M MY] 4.00 2.00 M 2 4 6 8 Hyd No. 1 SCS Pre Hyd. No. 1 -- 2 Year Q (cfs) 10.00 8.00 .It 4.00 2.00 0.00 10 12 14 16 18 20 22 24 26 Time (hrs) 5 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. v10.5 Friday, 07 114 / 2017 Hyd. No. 2 SCS Post Hydrograph type = SCS Runoff Peak discharge = 36.12 cfs Storm frequency = 2 yrs Time to peak = 12.15 hrs Time interval = 1 min Hyd. volume = 135,562 cuft Drainage area = 17.269 ac Curve number = 76 Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = KIRPICH Time of conc. (Tc) = 25.42 min Total precip. = 4.52 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 30.00 20.00 10.00 0.00 0 2 4 Hyd No. 2 SCS Post Hyd. No. 2 -- 2 Year 6 8 10 12 14 16 18 20 Q (cfs) 40.00 30.00 20.00 ROX1I17 0.00 22 24 26 Time (hrs) Hydrograph Report s Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. 00.5 Friday, 07 / 14 / 2017 Hyd. No. 3 Routed Pond Hydrograph type = Reservoir Peak discharge = 17.59 cfs Storm frequency = 2 yrs Time to peak = 12.45 hrs Time interval = 1 min Hyd. volume = 110,872 cuft Inflow hyd. No. = 2 - SCS Post Max. Elevation = 25.68 ft Reservoir name = Final Pond Max. Storage = 58,526 cuft Storage Indication method used. Q (cfs) 40.00 30.00 20.00 10.00 M Routed Pond Hyd. No. 3 -- 2 Year 5 10 15 20 Hyd No. 3 — Hyd No. 2 25 30 35 40 45 ® Total storage used = 58,526 cuft Q (cfs) 40.00 30.00 1 601 10.00 0.00 50 Time (hrs) 7 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. 00.5 Friday, 07 / 14 / 2017 Hyd. No. 1 SCS Pre Hydrograph type = SCS Runoff Peak discharge = 20.93 cfs Storm frequency = 5 yrs Time to peak = 12.18 hrs Time interval = 1 min Hyd. volume = 90,135 cuft Drainage area = 17.269 ac Curve number = 55 Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = KIRPICH Time of conc. (Tc) = 25.42 min Total precip. = 5.84 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Pre Q (cfs) Hyd. No. 1 -- 5 Year Q (cfs) 21.00 18.00 15.00 12.00 9.00 6.00 3.00 000 21.00 18.00 15.00 12.00 9.00 6.00 3.00 0 00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Hyd No. 1 Time (hrs) IV��w�rw w.rw M� li'w.�w..j 8 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. 00.5 Friday, 07 / 14 / 2017 Hyd. No. 2 SCS Post Hydrograph type = SCS Runoff Peak discharge = 55.04 cfs Storm frequency = 5 yrs Time to peak = 12.15 hrs Time interval = 1 min Hyd. volume = 204,848 cuft Drainage area = 17.289 ac Curve number = 76 Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = KIRPICH Time of conc. (Tc) = 25.42 min Total precip. = 5.84 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Q (cfs) 60.00 50.00 1111 II1 30.00 20.00 W1611l SCS Post Hyd. No. 2 -- 5 Year Q (cfs) 60.00 50.00 40.00 94111111 20.00 10.00 0.00 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 - -- Hyd No. 2 Time (hrs) Hydrograph Report 9 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. v10.5 Friday, 07 / 14 / 2017 Hyd. No. 3 Routed Pond Hydrograph type = Reservoir Peak discharge = 45.95 cfs Storm frequency = 5 yrs Time to peak = 12.27 hrs Time interval = 1 min Hyd. volume = 180,078 cuft Inflow hyd. No. = 2 - SCS Post Max. Elevation = 25.95 ft Reservoir name = Final Pond Max. Storage = 64,789 cuft Storage Indication method used. Routed Pond Hyd. No. 3 -- 5 Year Q (cfs) 60.00 50.00 r� 30.00 1 �� 0.00 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 2 — Total storage used = 64,789 cult Hydrograph Report 10 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D®2016 by Autodesk, Inc. 00.5 Friday, 07 / 14 / 2017 Hyd. No. 1 SCS Pre Hydrograph type = SCS Runoff Peak discharge = 33.44 cfs Storm frequency = 10 yrs Time to peak = 12.17 hrs Time interval = 1 min Hyd. volume = 134,579 cuft Drainage area = 17.259 ac Curve number = 55 Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = KIRPICH Time of conc. (Tc) = 25.42 min Total precip. = 7.01 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Hydrograph Report 11 Hydraflow Hydrographs Ddension for AutoCAD® Civil 3DO 2016 by Autodesk, Inc. 00.5 Friday, 07 / 14 / 2017 Hyd. No. 2 SCS Post Hydrograph type = SCS Runoff Peak discharge = 72.41 cfs Storm frequency = 10 yrs Time to peak = 12.15 hrs Time interval = 1 min Hyd. volume = 269,525 cuft Drainage area = 17.269 ac Curve number = 76 Basin Slope = 0.3 % Hydraulic length = 2000 ft Tc method = KIRPICH Time of conc. (Tc) = 25.42 min Total precip. = 7.01 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 SCS Post Q (cfs) Hyd. No. 2 —10 Year Q (cfs) 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0.00 80.00 70.00 60.00 50.00 40.00 30.00 20.00 10.00 0 00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Hyd No. 2 Time (hrs) 12 Hy'drograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2016 by Autodesk, Inc. 00.5 Friday, 07 / 14 / 2017 Hyd. No. 3 Routed Pond Hydrograph type = Reservoir Peak discharge = 68.21 cfs Storm frequency = 10 yrs Time to peak = 12.22 hrs Time interval = 1 min Hyd. volume = 244,703 cuft Inflow hyd. No. = 2 - SAS Post Max. Elevation = 26.11 ft Reservoir name = Final Pond Max. Storage = 68,786 cuft Storage Indication method used. Q (Cfs) 80.00 70.00 40.00 20.00 10.00 Q (cfs) 80.00 70.00 [-11111OR 50.00 40.00 1110111II1; 20.00 10.00 0.00 -1 1 I I I I I '- 0.00 0 2 4 6 8 10 12 14 16 18 20 22 24 26 Time (hrs) Hyd No. 3 Hyd No. 2 ® Total storage used = 68,786 CA a c rt CD a rt O C O C O O O O O O O C C5 0 N/ F �c C I s � 0W O - V N O i i A O mg I C 'O O N 7 !�F Q I o 6D O Q V � O O � m 3 � D � W C ` � N Q �1 S 0 C 3 A m <m D -4 V m � vt f o� o D � � ACD O 01 n OC40 V '\ to to I ci I � D N Z c n 0 y 7 O O v i Worksheet for 1-yr Spillway Project Description Solve For ;Input Data Headwater Elevation Crest Elevation Tailwater Elevation Crest Surface Type Crest Breadth Crest Length Pesuits Discharge Headwater Height Above Crest Tailwater Height Above Crest Weir Coefficient Submergence Factor Adjusted Weir Coefficient Flow Area Velocity Wetted Perimeter Top Width Discharge Gravel 25.48 ft 25.40 R 0.00 ft 8.00 ft 20.00 ft 1.15 ft /s 0.08 ft -25.40 ft 2.54 US 1.00 2.54 US 1.60 ft2 0.72 ft/s 20.16 ft 20.00 ft Bentley Systems, Inc. Haestad Methods Sol6A"4%eRiewMaster V81(SELECTseries 1[ [08.11.01.03] 71141201711:27:12 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Worksheet for 2-yr Spillway Project Description Solve For Discharge :Input Data Headwater Elevation Crest Elevation Tailwater Elevation Crest Surface Type Crest Breadth Crest Length Results Discharge Headwater Height Above Crest Tailwater Height Above Crest Weir Coefficient Submergence Factor Adjusted Weir Coefficient Flow Area Velocity Wetted Perimeter Top Width Gravel 25.68 ft 25.40 ft 0.00 ft 8.00 ft 20.00 ft 7.75 ft3/s 0.28 ft -25.40 ft 2.62 US 1.00 2.62 US 6.60 ft2 1.38 ft/s 20.56 ft 20.00 ft Bentley Systems, Inc. Haestad Methods SolNbar 4011swMaster V81(SELECTselag 1) [08.11.01.03] 7/14/2017 11:27:35 AM 27 Slemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203.756.1666 Page 1 of 1 Project Description Solve For ;Input Data Headwater Elevation Crest E!eVatiUFI Tailwater Elevation Crest Surface Type Crest Breadth Crest Length Results Discharge Headwater Height Above Crest Tailwater Height Above Crest Weir Coefficient Submergence Factor Adjusted Weir Coefficient Flow Area Velocity Wetted Perimeter Top Width Worksheet for 5-yr Spillway Discharge Gravel 25.94 ft 25.40 ft 0.00 ft 8.00 ft 20.00 ft 21.47 fta/s 0.54 ft -25.40 ft 2.71 US 1.00 2.71 US 10.80 ft' 1.99 ft/s 21.08 ft 20.00 ft Bentley Systems, Inc. Haested Methods SOIL11111coldiftfillow Master V8i (SELECTseries 1) [08.11.01.03] 71141201711:28:09 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Project Description Solve For Input Data Headwater Elevation Crest Elevation Tailwater Elevation Crest Surface Type Crest Breadth Crest Length Results Discharge Headwater Height Above Crest Tailwater Height Above Crest Weir Coefficient Submergence Factor Adjusted Weir Coefficient Flow Area Velocity Wetted Perimeter Top Width Worksheet for 10-yr Spillway Discharge Gravel 26.11 ft 25.40 f[ 0.00 ft 8.00 ft 20.00 ft 32.97 ft'/s 0.71 ft -25.40 ft 2.76 US 1.00 2.76 US 14.20 ft' 2.32 ft/s 21.42 ft 20.00 ft Bentley Systems, Inc. Haestad Methods SoldiotftfiiewMaster V81 (SELECTsedes 1) 108.11.01.03] 71141201711:28:18 AM 27 Siemons Company Drive Suite 200 W Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 Johnson, Kelly From: Johnson, Kelly Sent: Monday, July 10, 2017 4:37 PM To: 'Greg Thompson' Cc: John Scott; Jerry Beckman Subject: RE: Turtle Creek Attachments: 2017 01 excel_WP 060608_to Greg.xlsx G reg, What a mess. My calcs (attached) reflect the "original" data presented below. (The spreadsheet is an excerpt of a much larger one, and so some unnecessary links are off but I fixed the ones that are applicable for the pond.) It shows how the PP volume was calculated (Cell B40), but perhaps the areas and elevations that were fed into that calculation were in error? If we need to meet, are you free Thursday afternoon? KJ From: Greg Thompson [mailto:GThompson@sepiengineering.com] Sent: Friday, July 07, 2017 4:01 PM To: Johnson, Kelly <kelly.p.johnson@ncdenr.gov> Cc: John Scott <JScott@sepiengineering.com>; Jerry Beckman <JBeckman@sepiengineering.com> Subject: RE: Turtle Creek Kelly I have the drawing on my desk and have been in the process of cleaning up the calculations. In doing this, I have discovered other issues. I had hoped to go through the calculations and quantify these so that you could see what it is that I found and so that we would have the info in hand to fully discuss. The issue is that I cannot calculate/develop the same values which were presented to NCDEQ for permitting. The issue of the storage volume aside which we did resolve, what I am finding is what seems to be values provided in the original calculations that are not accurate. For an example, the Design information provided to you originally indicates Volumes which I can't verify. Original: Temporary Pool Volume = 51,780 CF: Permanent Pool Volume = 80,473 CF: Forebay Volume = 16,888 CF: Forbay % of Permanent Pool = 21% As -Built: Temporary Pool Volume = 52,492 CF (as revised): Permanent Pool Volume = 55,882 CF : Forebay Volume = 2,573 CF: Forebay % of PP = 4.6% Would it be possible to sit down and go through what it is I am seeing and try to come to some understanding on what should be done? I am not completely up to speed on the context of the origonal intent to resolve an already bad situation. I would like to do this in a way that is acceptable to all parties, especially to NCDEQ. Greg Gregory R. Thompson, PE, PLS IAsst. Vice President Site/Civil Department Manager SEPI Lngineering & Construction 5030 New Centre Drive, Suite B I Wilmington, NC 28403 Direct: 910.523.5714 1 Cell: 910.817.8124 1 sepiengineering.com Connect with us: Linkedin I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. From: Johnson, Kelly [mailto:kelly.p.johnson@ncdenr.govI Sent: Friday, July 07, 2017 12:04 PM To: Greg Thompson Cc: John Scott Subject: RE: Turtle Creek Greg, I haven't seen this yet. Is it in the building and just not to me yet? Thanks From: Johnson, Kelly Sent: Friday, June 30, 2017 10:15 AM To: 'Greg Thompson' <GThompson@sepiengineering.com> Cc: John Scott <JScott@sepienginee ring.com> Subject: RE: Turtle Creek Here, too. At least it will be quiet in the office... have a good weekend. KJ From: Greg Thompson [mailto:GThompson@sepiengineering.coml Sent: Friday, June 30, 2017 10:08 AM To: Johnson, Kelly <kelly.p.iohnson@ncdenr.gov> Cc: John Scott <JScott@sepiengineering.com> Subject: RE: Turtle Creek Kelly Sure thing .... i hope next week will be ok, for some reason most of our staff has disappeared, starting early on the July 4 holiday I suppose. Greg Gregory R. Thompson, PE, PLS JAsst. Vice President Site/Civil Department Manager SEPI Engineering & Construction 5030 New Centre Drive, Suite B I Wilmington, NC 28403 Direct: 910.523.5714 1 Cell: 910.817.8124 1 sepieneineering.com Connect with us: I...inkedln I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. From: Johnson, Kelly (mailto:kelly.n.johnson@)ncdenr.gov] Sent: Friday, June 30, 2017 10:06 AM To: Greg Thompson Subject: RE: Turtle Creek Thanks. I think we are on track. Can you submit a second set of plans, and also a copy of the revised calcs for the file? Thanks, Kelly From: Greg Thompson [mailto:GThompson@sepiengineerinR.com] Sent: Wednesday, June 28, 2017 10:04 AM To: Johnson, Kelly <kelly.P.iohnson@ncdenr.eov> Subject: RE: Turtle Creek Kelly Attached is the letter you sent with some suggested revisions. The revised drawings will go out to you today. Please let me know if you need anything else or if what I have provided needs revision. Thanks again for your help Greg Gregory R. Thompson, PE, PLS IAsst. Vice President Site/Civil Department Manager SEPI Engineering & Construction 5030 New Centre Drive, Suite B I Wilmington, NC 28403 Direct: 910.523.5714 1 Cell:910.817.8124 1 sepiensineerina.com Connect with us: Linkedln I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. From: Johnson, Kelly [mailto:kelly.p.johnson@)ncdenr.aov] Sent: Thursday, June 22, 2017 3:45 PM To: Greg Thompson Cc: Nick Garner (nick(accrgnc.com) Subject: RE: Turtle Creek It is drafted, attached. From: Johnson, Kelly Sent: Thursday, June 22, 2017 3:11 PM To:'Greg Thompson' <GThompson@sepienRineering.com> Cc: Nick Garner (nick@ccrgnc.com) <nick@ccrenc.com> Subject: RE: Turtle Creek I am pretty sure Nick just had a heart attack when you mentioned moving a berm... I don't think we want to go that route. We just need to fix the numbers. I think that if you can move the PP elev down a bit and still be comfortably within the distance to the SHWT where you won't drain wetlands then I think that is the best route. I think given the complicated history here, we should do this as a correction and not as a permit modification. Please submit two revised (I suppose they are as -built?) plans, and revised/stamped calcs showing the new design data for 52,492cf. FYI, though, technically this should be a minor modification (which is the new term for "plan revision" under the 2017 rules). So, if in the future you apply to do something similar where technically the pond is being redesigned you will be asked for a minor modification. But, this project has been through so much already let's just get this finished. Thanks, KJ From: Greg Thompson[mailto:GThompson@sepiengineering.com] Sent: Thursday, June 22, 2017 2:52 PM To: Johnson, Kelly <kelly.p.iohnson@ncdenr.gov> Cc: Nick Garner (nick@ccrgnc.com) <nick@ccrgnc.com> Subject: RE: Turtle Creek Kelly There was a bust in the calculations submitted for storage volume which should have been reported somewhere around what the actual as -built storage volume, 49,584 cf. The listed "volume Provided (Temp Pool)" — 51,780 is not possible with the orifice set at 22.91. We are above the 42,946 cf now however we can get to 52,492 cf if we move the orifice down 0.16' (approx. 1-7/8 inches). Nothing else would change. The only option available so that we hold the normal pool elevation at 22.91 and gain volume would be to move a portion of the berm back however in doing so, to maintain slope stability, we would begetting into the wetlands and likely lose a few trees. The pond is as big as it can get without further impacts. Please let me know if I have confused you with my description/explanation. Greg Gregory R. Thompson, PE, PLS IAsst. Vice President Site/Civil Department Manager SEPI Engineering & Construction 5030 New Centre Drive, Suite B I Wilmington, NC 28403 Direct: 910.523.5714 1 Cell:910.817.8124 1 sepiengineerinit.com Connect with us: Linkedln I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. From: Johnson, Kellyfmailto:kelly.p.johnsonC&ncdenr.gov] Sent: Thursday, June 22, 2017 2:37 PM To: Greg Thompson Cc: Nick Garner (nick(&ccrgnc.com) Subject: RE: Turtle Creek Greg, Is the issue that the permanent pool area and/or the temporary pool area are built smaller than they were expected to be built? Or, is there some sort of discrepancy between the calculations and the pond's design data (which isn't on the plan but I'm sure you have that in AutoCAD)? The data in the calculations shows that the volume of the pond would be 51,780sf. I'm just trying to figure out the best path forward for this. Storage Calculations Elevation, Permanent Pool, fmsl: 22.91 Elevation, Temp. Pool, fmsl: 25.40 Area, Perm Pool, W: 17,497 Area, Temp.Pool, W: 24,093 Volume Provided (Temp Pool), ft3: 51,780 As you may remember, this permit was done as SA under the 1995 rule at 1.5" when the infil basin was designed. When we switched to the pond, technically that triggered it into the 2008 design standards which would have required the 1yr24hr pre/post (probably-3.8"). That volume wouldn't fit in the available space because of the wetlands and the homes that are already built. So, we had to cut a deal. If you calculate the required volume based on the DA, Imperv, and 1.5" the required volume is 42,946cf. Generally, as long as the provided volume is bigger than the required volume then you get a permit. In this case, the bar was set differently. We essentially asked Eric to figure out what the biggest possible pond would be, and then build that. I just need to figure out what happened with the numbers so I can explain it to Georgette and figure out what to do. Thanks, KJ From: Greg Thompson [mailto:GThompson sepiengineering.com] Sent: Wednesday, June 21, 2017 4:41 PM To: Johnson, Kelly <kelly.p.iohnson@ncdenr.gov> Cc: Nick Garner (nick@ccrgnc.com) <nick@ccrgnc.com> Subject: Turtle Creek Kelly To follow up on the message I left on your phone; The pond, as built, is a little short on the permitted volume. To be honest, the plans as drawn would not generate the exact volume required if constructed precisely as drawn. It would be about 4.2% short. Having said that, the pond cannot increase in size, footprint, as there are limitations around the perimeter with private property and wetlands. To increase the footprint would be to impact wetlands. The current permitted volume is 51,780 cubic feet. This is detailed in the supplement forms submitted with a normal pool elevation of 22.91 and a temporary pool elevation of 25.4. If we drop the outlet orifice elevation 0.16 so that the normal pool is at 22.75 we will get a volume of 52,492 cf. I wanted you to be in on this discussion to see if you were good with the direction we are heading. Greg Gregory R. Thompson, PE, PLS IAsst. Vice President Site/Civil Department Manager SEPI Engineering & Construction 5030 New Centre Drive, Suite B I Wilmington, NC 28403 Direct: 910.523.5714 1 Cell: 910.817.8124 1 sepiengineering.com Connect with us: Linkedin I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. 3 PI COASTAL CAROLI A I ue•u....a. Moen..# I M&MINg. —. tur- ei>"..r..parnrru.n ` 1--i911-5432 Coastal Carolina Resource Group, Inc. 2921 Blue Clay Rd. Castle Hayne, NC 28429 910-791-5432 (0) 910-791-4768 (F) nick@ccrenc.com Ii��VOICL', INVOICE # : 10824 DATE: July 5, 2017 TO Wells Fargo RE: The Villages at Turtle Creek (Attn: Erin Acton) Stormwater Wet Pond 1B 1 Independence Drive, 10th Floor Permit Modification SW8 060608 Jacksonville, FL 32202 PH: 904-351-7346 erin.acton@wellsfarso.com ITEM # DESCRIPTION LINE TOTAL Coastal Carolina Resource Group (CCRG) has constructed the approved modification of the Stormwater Infiltration Basin 1B into a Stormwater Wet Pond 1B located in the Village at Turtle Creek 1 subdivision as indicated in a NCDEMLR Permit Modification and Extension dated January 10th 2017. Please see attached pictures and map for location details. Site ArcPss/Preparation �.-._.____. -- - -.. �___... _�_._�__-c._..��-Yam•,-�,.�Y,,.� �_ _-�.,� - CCRG reinforced the construction site access road. A combination of temporary steel bridging mats over $ 66,030.00 the culverted stream crossing and logging mats were utilized through the woods in preparation for the anticipated heavy traffic load associated with moving 2000 cu.yds of excavated material. CCRG reinforced the grass entrance to the site through the common area by installing a combination of proplex fabric and #4 Ballast stone in the known weak spots to prevent the rutting and damage created by heavy dump truck traffic. CCRG continued by trenching and installing a temporary silt fence along the boundary of the access road as well as around the proposed stockpile area. CCRG brought in a large CAT 336 excavator to move the 10,000 lb. outlet structure and 65 feet of 42" outlet pipe to its final destination. CCRG installed a 42" pipe plug in the existing inlet pipe to stop incoming water. CCRG utilized a diaphragm pump to draw down the infiltration basin as well as to bypass all incoming water through an erosion control device that was installed in an existing bypass swale. CCRG finished by bringing in a Licensed surveyor to install elevation benchmarks, layout the proposed wet pond boundary limits and install the initial grade stakes to represent what SEPI engineering has designed and permitted Pond Construction CCRG constructed the Wet Pond modification design as permitted for the Infiltration Basin 1B by SEPI $ 98,612.00 Engineering. CCRG began by utilizing a large track excavator to break through the existing berm to remove the previously installed 18 inch Corrugated metal pipe and corresponding riser structure. Once the pipe was removed, CCRG backfilled the breach in lifts and compacted the soils to prevent future erosion. CCRG continued by installing a washed stone foundation for the new proposed outlet structure. CCRG trenched through the berm in preparation for the new outlet pipe install. CCRG placed and aligned the new 10,000 lb. outlet structure on its new foundation. CCRG continued by installing 60 ft. of new 42 inch diameter HDPE pipe through the berm breach and connecting it to the outlet structure box. With the approval from SEPI, CCRG installed a 45 degree joint in the pipeline to divert water away from residents homes. CCRG installed a bentonite anti -seep collar around the outlet pipe to prevent the water in the pond from flowing around the pipe and eroding. CCRG secured the mouth of the outlet pipe with a new galvanized flared end section surrounded by Class B granite Rip -Rap to prevent erosion. CCRG backfilled the pipe trench and compacted the soils to prevent future erosion. The newly repaired berm was secured with landlock fabric and centipede sod. CCRG abandoned and bricked up the old 42 inch bypass pipe. CCRG backfilled the old bypass spillway and graded it to match the existing bank. CCRG continued by adjusting the inlet area. CCRG utilized a large tracked excavator to remove the existing 5,000 lb. flared end section as well as 16 feet of existing 42 inch HDPE pipe. CCRG created a new washed stone foundation and replaced the flared end section into its new location. CCRG constructed the new proposed forebay basin and corresponding forebay berm out of Class B Granite Rip -Rap. CCRG continued by dredging out the estimated 2000 cu.yds of material in order to create the new permitted basin size and depth. CCRG utilized some of the suitable dredged material to build up the perimeter berm to its new designed elevation. CCRG installed a new 20 ft. emergency spillway and reinforced it with geo-fabric and Class B Rip Rap. CCRG finished by trucking approximately 160 loads of material offsite to a nearby dumpsite. Project Fin-alization CCRG finished up the project by fine grading all the banks to the specified 3:1 slope and contacting the $ 20,844.00 surveyor to return and provide a final as -built survey of the newly constructed wet pond basin to insure it has the desired storage volume and everything is installed as designed. Please see attached as -built survey. CCRG rough raked the pond banks and covered with millet, a coastal blend grass seed and straw. Once the proper basin volume was determined, CCRG uninstalled the pipe plug/pump system. CRRG continued by removing all the erosion control devices and road access matting/bridging as well as all the heavy machinery. CCRG finished by raking and over seeding all disturbed areas created in the access areas. All excess debris created by the above construction project was removed offsite and disposed of properly. Subtotal:! $ 185,486.00 I50 % Retainer Paid (CkN668701265) Dated 4-6-17I $ 92,743.00 I Total Due: $ 92,743.00 Terms: Due Upon Rece!pt Flake all checks payable to Coastal Carolina Resource Group, Inc. THANK YOU FOR YOUR BUSINESS! easo-0 `dNncmv'J WJNON 'Awoo io cgywgm1 3 4-N •uWk*4M _ a4GNMOl wGiol 'Zo jing w tot" n..P" ISE b01 9d 9ti 9W 'fiL 9d 160b 9a ■ $ slwnarw•�nu3nans•oxia woxa = _ ON 'VON'AMNO 311NM iV G9WlIA e h d = O Vid rMuVIDOSS9 cMF 4NOd NO11N31" Ng"O all? m ¢ p AlS Ma3CEalL43Aa!IS DWI TWOMSdOld 'NOd lling-GY 4NOd kit 1101 3Y 0` .t � ®rr 'E g g � :i .S dA F SEPI Engineering & Construction, Inc. SER 5030 New Centre Drive I Suite B I Wilmington, NC 28403 ENGINEERINGi Main: 910.523.5714 1 Fax: 910.523.5716 C O N S T R U C T ION sepiengineering.com Transmittal Letter To: Date: NCDEQ June 28, 2017 127 Cardinal Drive Extension Wilmington, NC 28405 Copies: Attention: 1 Kelly Johnson VIA: From: Hand Greg Thompson, PE, PLS SEPI Engineering & Construction Subject: SEPI Project Number: Turtle Creek - Pond 1B SC16.015 We are sending you: ❑ Shop Drawings ❑ Specifications ❑ Contracts Copies Date 1 06/28/17 1 06/28/17 Comments: ❑ Prints ❑ Copy of Letter ❑ Invoice ® Plans ❑ Change Order Description Asbuilt Set Wet Pond Designer's Certification ❑ Samples ❑ Documents If you have any questions or need additional information, please contact me at 910.550.3251 or email gthompson@sepiengineerina.com. Sincerely, ECEIVE 8Y� Signed: Page: 1/1 4-a COASTAL CAROLINA ' RESOURCE GROUP wil. •�At: In'#Ja t 6 w.s be I ra.-.L-�—t•le uu IdA LA I ULu 1& WOCUP 141wWW W2Mntt c? 10, -79.11. -5432 Coastal Carolina Resource Group, Inc. 2921 Blue Clay Rd. Castle Hayne, NC 28429 910-791-5432 (0) 910-791-4768 (F) nick@ccrim com TO Wells Fargo (Attn: Erin Acton) 1 Independence Drive, 10th Floor Jacksonville, FL 32202 PH:904-351-7346 erin.acton@wellsfareo.com INVOI(.l INVOICE M 10999+A1 DATE: June 22, 2017 RE: The Villages at Turtle Creek Stormwater Treatment Facility Cutting ITEM # DESCRIPTION LINE TOTAL 1 Coastal Carolina Resource Group (CCRG) repaired the outstanding vegetation compliance issues for the $ 1,883.00 stormwater treatment facilities located in the Village of Turtle Creek subdivision. Please see attached map for location details. CCRG chemically treated the cattails growing in infiltration Basins 1A and ID prior to cutting them down. CCRG continued by utilizing the combination of a hand crew and hydro-ax to access the overgrown Infiltration Basin 1C to remove all the unwanted woody and herbaceous vegetation present. CCRG trimmed the remaining infiltration basins by hand prior to leaving the site. Total $ 1,883.00 Fully Licensed and Insured Make all checks payable to Coastal Carolina Resource Group, Inc. THANK YOU FOR YOUR BUSINESSI r-i ++ _ m c m ! 1 b x r� ❑ 04- L. C "A*\\; kF— tt rod .t-{�f1•R �..� � ,, x ow r i� + y 41 dD C U �+ 7 aj u fV ►. m rl C .y C •y m m t C C j: L L tkO tic 3 o +� u E d 4 a U S c in m m _ co m o m 4' cc c a-� U tui a a Johnson, Kell From: Johnson, Kelly Sent: Friday, May 19, 2017 2:44 PM To: 'Greg Thompson'; Nick Garner Subject: RE: Trash Racks Thanks Greg. I will leave this on file in case it comes up again. Have a good one, Kelly From: Greg Thompson [mailto:GThompson@sepiengineering.com] Sent: Friday, May 19, 2017 10:58 AM To: Johnson, Kelly <kelly.p.johnson@ncdenr.gov>; Nick Garner <nick@ccrgnc.com> Subject: RE: Trash Racks Kelly The changes from the plan were limited to the orientation of the discharge from the outlet pipe. The location of the outlet structure has not been modified. As originally drawn, the pipe discharge was directed towards a residential lot in a manner that gave the owner concern. The discharge was in the direction of an existing wetland area which is on the residential lot and continues onto common area. Rotating the pipe also smoothed out the transition of the discharge. As drawn, the discharge would have to change direction, maybe 45-65 degrees after it left the pipe which in practice would likelv invite erosion. Rotating the pipe and dissipating the flow to maintain a more linear discharge pattern seemed to resolve all of these issues. The discharge is still going to the same place but in a less aggressive manner and the lot owner does not have a discharge pipe pointed at his back yard and house. This change seemed to be minor as we were simply encouraging flow redirection inside the pipe as oppose to utilizing grade features immediately after discharge. Hope this helps. Greg Gregory R. Thompson, PE, PLS IAsst. Vice President Site/Civil Department Manager SEPI Engineering & Construction 5030 New Centre Drive, Suite B I Wilmington, NC 28403 Direct: 910.523.5714 1 Cell:910.817.8124 1 sepieneineering.com Connect with us: Linkedln I Twitter I Facebook Confidentiality Notice: This message is intended only for the designated recipient(s). It may contain confidential or proprietary information and may be subject to the attorney -client privilege or other confidentiality protections. If you are not a designated recipient, you may not review, copy or distribute this message. If you receive this in error, please notify the sender by reply e-mail and delete this message. Thank you. From: Johnson, Kelly rmailto:kelly_p.johnson@ncdenr.gov] Sent: Friday, May 19, 2017 10:26 AM To: Nick Garner; Greg Thompson Subject: RE: Trash Racks Greg, I haven't had a chance to pull the files and see what, if any, the changes mean for the plans. Do these changes have any impact of the project's design such that we need to formally update the plans? it does not sound like the first two do. I am not sure about the third? Thanks, KJ From: Nick Garner [mailto:nick@ccrgnc.com] Sent: Friday, May 19, 2017 9:35 AM To: Johnson, Kelly <kelly.p.lohnson@ncdenr.pov> Subject: RE: Trash Racks Ok sounds good. Also I wanted to inform you that we had to make adjustments to the 42" outlet pipe. I ran these changes by the Greg with SEPI for the OK. 1) We installed two anchoring collars consisting of a concrete/rebar footer and an aluminum band around the exposed pipe to prevent flotation... They have been spaced every 10 feet as specified by ADS pipe manufacturing. See attached Pic. 2) We have also installed a bentonie anti -seep collar in the berm to prevent water from flowing around the pipe and compromising the berm. 3) We had to also install an ADS 45 degree elbow near the end of the outlet pipe to divert water away from residents backyard. See attached pic. If you have any questions, please feel free to contact me. Thanks and have a great weekend! Nick Garner CCRG- Stormwater Manager 91.0.470.4225 nl. ?? C. DCcrgjpr -on, From: Johnson, Kelly[mailto:kelly.p.iohnson@ncdenr.;zov] Sent: Thursday, May 18, 2017 9:34 AM To: Nick Garner (nick@ccrgnc.com) <nick@ccrgnc.com> Subject: FW: Trash Racks I just pulled the plans for Turtle Creek, and you are correct. It does not specify dimensions for the trash rack, and I missed it during the review. I will leave this email and a copy of applicable page of the SCM Manual stapled to the plan to establish that we talked today and decided to go with 5.5in spacing. Thanks for catching that. KJ From: Johnson, Kelly Sent: Thursday, May 18, 2017 9:14 AM To: Nick Garner (nick@ccrgnc.com) <nick@ccrgnc.com> Subject: Trash Racks Nick, I got your voicemail. The new regulations requires a trash rack, but it doesn't specify details. Here is the guidance in the SCM Manual, https://ncdenr.s3.amazonaws.com/s3fs- public/Energy%20Mineral%20and%2OLand/o20Resources Stormwater BMP%2OManual A- 4%20%20Common%20Structures%20and%20Materials.pdf (page 18). 1 think that if it is an existing, permitted site that you just go by what the existing plans say though. If you have questions, please let me know. Kelly K.eL L UJ 0 k I&S C) VI. Kelly Johnson Environmental Engineer NC Division of Energy, Mineral and Land Resources Stormwater Permitting 127 Cardinal Drive Extension Wilmington, NC 28405-3845 Phone: 910.796.7331 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. iz 496COASTAL CAROLINA i "RESOURCE GROUP iris; t-'AcIFi MPub y"_ aml...: I f V h W.vj C{Q I a:V. >i t,r tN.A: Au - tl Y 07 "J S -S+32 Coastal Carolina Resource Group, Inc. 2921 Blue Clay Rd. Castle Hayne, NC 28429 910-791-5432 (0) 910-791-4768 (F) nick@ccrenc.com TO Wells Fargo (Attn: Erin Acton) 1 Independence Drive, 10th Floor Jacksonville, FL 32202 PH: 904-351-7346 erin.acton@wellsfariao.com INVOICL. DATE: January 16, 2017 INVOICE: 10192 RE: The Villages at Turtle Creek Stormwater Treatment Facility Repairs ITEM # DESCRIPTION LINE TOTAL 1 Coastal Carolina Resource Group (CCRG) repaired the outstanding compliance issues for the stormwater treatment facilities located in the Village of Turtle Creek subdivision. CCRG utilized the combination of a hand crew and hydro-ax to access the overgrown Infiltration Basins to remove all the unwanted woody and herbaceous vegetation present. Please reference attached map and pictures for details. $ 1,600.00 Total $ 1,600.00 Approval & Notice to Proceed On Item # Owner's Representative Fully Licensed and Insured Make all checks payable to Coastal Carolina Resource Group, Inc. THANK YOU FOR YOUR BUSINESS! y 4-0 L O o N Q C cm U V41 41 u ai rAL N N CO co L � L U y U 4A• i { on s c i4-1 • . , 4-1; u !0 fC co _ ca Y Y U U sLj . . . . . . . . . . . . . . . . . minC 41 al M C co co 4 Y Je (U (U tw to S 41 41 :3 u u L- L- ai m m ca u C vi m co m co Je LA cu .0 r M 0 LL. 4-j L. C cu 4-0 4) m 4-1 E o4-0 Ln