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HomeMy WebLinkAboutSW8150905_Current Permit_20170607Energy, Mineral & Land Resources ENVIRONMENTAL QUALITY June 7, 2017 Dr. Arnold Sobol, Manager Aftew Properties, LLC 2020 S. Churchill Drive Wilmington, NC 28403 Subject: State Stormwater Management Permit No. SWS 150905 The Village at Motts Landing Phase 2C High Density Subdivision Wet Detention Pond Project New Hanover County Dear Dr. Sobol: ROY COOPER Governor MICHAEL S. REGAN Secretary TRACY DAVIS Director The Wilmington Regional Office received a complete, modified State Stormwater Management Permit Application for The Village at Motts Landing Phase 2C on June 7, 2017. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000 and Session Law 2008-211. We are forwarding modified Permit No. SW8 150905 dated June 7, 2017, for the construction, operation and maintenance of the BMP's and built -upon area associated with the subject project. The following modifications have been permitted: 1. Pond Design: Both ponds have been redesigned. 2. Number of Lots: The number of lots has decreased from 61 to 56. This permit shall be effective from the date of issuance until February 19, 2024, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the conditions listed in this permit regarding the Operation and Maintenance of the BMPs, recordation of deed restrictions, certification of the BMP's, procedures for changing 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 certify the BMP's, 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, or need additional information concerning this matter, please contact Kelly Johnson in the Wilmington Regional Office, at (910) 796-7215. Sincerely, Cr Tracy Da is, P.E., Director Division of Energy, Mineral and Land Resources GDS/kpj: \\\Stormwater\Permits & Projects\2015\150905 HD\2017 06 permit 150905 cc: Phil Tripp, PE, Tripp Engineering Inspector, New Hanover County Inspections New Hanover County Engineering Division of Coastal Management Wilmington Regional Office Stormwater File State of North Carolina I Environmental Quality 1 Energy, Mineral and Land Resources Wilmington Regional office 1 127 Cardinal Drive Extension ' Willnington, NC 28405 910 796 7215 State Stormwater Management Systems Permit No. SW8 150905 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL AND LAND RESOURCES STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY SUBDIVISION 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 Aftew Properties, LLC The Village at Motts1anding Phase 2C 5625 River Road, Wilmington, New Hanover County FOR THE construction, operation and maintenance of two (2) wet detention pond(s) in compliance with the provisions of 15A NCAC 2H .1000 and Session Law 2008-211 (hereafter referred to as the "stormwater 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 (hereafter referred to as the Division or DEMLR) and considered a part of this permit. This permit shall be effective from the date of issuance until February 19, 2024 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. 2. The subdivision is permitted for 56 lots, each allowed a maximum of 5,000 square feet of built -upon area. 3. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.6 of this permit. The runoff from all built -upon area within the permitted drainage areas of this project must be directed into the permitted stormwater control systems. The wet ponds designated as Pond 1 and Pond 2, have been designed to treat the runoff from 170,020 square feet (including 0 square feet of future impervious area) for Pond 1, and 285,050 square feet of impervious area (including 15,000 square feet of future impervious area) for Pond 2. 4. The maximum built -upon area allowed for the entire subdivision is 455,070 square feet. A 50' wide vegetative buffer must be provided and maintained adjacent surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of both sides of streams and rivers and the mean high water line of tidal waters. Page 2 of 8 State Stormwater Management Systems Permit No. SW8 150905 The following design elements have been permitted for this wet detention pond stormwater facility, and must be provided in the system at all times. a. Drainage Area, Acres: Onsite, ft2: Offsite, ft2: b. Total Impervious Surfaces, ft2: Lot Impervious, ft2: Roads/Parking, ft2: Other, ft2: future, ft2: Offsite, ft2: c. Average Pond Design Depth, ft: d. TSS Removal Efficiency, %: e. Design Storm, in: f. Permanent Pool Elevation, fmsl: g. Permitted Surface Area at PP, ft2: h. Temporary Storage Elevation, fmsl: i. Predevelopment 1 yr-24 hr. discharge rate, cfs: j. Controlling Orifice Diameter, in: k. Orifice Flowrate, cfs: I. Permanent Pool Volume, ft3: m. Forebay Volume, ft3: n. Maximum Fountain Horsepower, hp: o. Receiving Stream/ River Basin p. Classification of Water Body II. SCHEDULE OF COMPLIANCE Pond 1 Pond 2 10.30 15.28 448,579 665,808 0 0 170,020 285:050 100,000 180,000 62,155 56,105 7,865 33.945 0 15,000 0 0 3.04 4.25 90% 90% 1.5 1.5 8.00 8.50 20,765 23,701 10.00 10.00 12.63 11.92 2.00 2.50 0.09 0.12 51,035 78,629 10,294 15,441 1/6 1/4 Motts Creek / Cape Fear C; SW No person or entity, including the permittee, shall alter any component of the approved stormwater system shown on the approved plans. 2. The permittee shall review all lot plans for new construction and any subsequent modifications and additions, for compliance with the conditions of this permit. The permittee shall not approve any lot plans where the maximum allowed built -upon area has been exceeded, or where revisions to the grading or to the storm drainage system are proposed unless and until a permit modification has been approved by the Division. 3. The permittee is responsible for the routine monitoring of the project for compliance with the built -upon area limits, grading, and the storm drainage system established by this permit, the permit documents, the approved plans, and the recorded deed restrictions. The permittee shall notify any lot owner that is found to be in noncompliance with the conditions of this permit in writing, and shall require timely resolution. 4. 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. 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. Page 3 of 8 State Stormwater Management Systems Permit No. SW8 150905 6. All stormwater collection and treatment systems must be located in public rights -of -way, dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required rights -of -way, common areas and easements, in accordance with the approved plans. Access to the stormwater facilities for inspection and maintenance shall be maintained via appropriate recorded easements at all times. 7. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 8. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, the permittee shall cause a certification from an appropriate designer for the system installed to be submitted, 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. A modification may be required for those deviations. 9. 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 any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Redesign or addition to the approved amount of built -upon area or to the drainage area. C. Further development, subdivision, acquisition, lease or sale of any, 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. d. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. e. The construction of any future BUA listed on the application. 10. The permittee shall at all times provide the operation and maintenance necessary to assure that all components of the permitted stormwater system function at design condition. The approved Operation and Maintenance Agreement is incorporated by reference into this permit and must be followed in its entirety and maintenance must occur at the scheduled intervals. 11. Records of maintenance activities must be kept and made available upon request to authorized personnel of the Division. The records will indicate the date, activity, name of person performing the work and what actions were taken. 12. 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 SW8150905, as issued by the Division of Energy, Mineral and Land Resources 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 Division. e. Alteration of the drainage as shown on the approved plans may not take place without the concurrence of the Division. f. The maximum built -upon area per lot is 5,000 square feet. 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. Page 4 of 8 State Stormwater Management Systems Permit No. SW8 150905 All runoff from the built -upon areas on the lot must drain into the permitted system. This may be accomplished through providing roof drain gutters, which drain to the pond or street, grading the lot to drain toward the street or directly into the pond, or grading perimeter swales and directing them into the pond or street. Built -upon area in excess of the permitted amount will require a permit modification. All affected lots shall maintain a 50' wide vegetative buffer adjacent to surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of each side of streams and rivers and the mean high water line of tidal waters. Any individual or entity found to be in noncompliance with the provisions of a stormwater management permit or the requirements of the Stormwater Rules is subject to enforcement procedures as set forth in G.S. 143, Article 21. 13. 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. 14. If the stormwater system is 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. 15. Prior to transfer of the permit, the stormwater facilities will be inspected by Division personnel. The project and the stormwater facility must be in substantial compliance with all permit conditions. Any, items not in compliance must be repaired, replaced or restored to design condition prior to the transfer. Records of maintenance activities performed to date will be required. 16. If the permanent pool volume is greater than 30,000 cubic feet, a decorative spray fountain will be allowed in the stormwater treatment system, subject to the following criteria: a. The fountain must draw its water from less than 2' below the permanent pool surface. b. 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. C. The falling water from the fountain must be centered in the pond, away from the shoreline. d. The maximum horsepower for the fountain's pump is based on the permanent pool volume. The maximum pump power for a fountain in this pond is 1/4hp for Pond 1 and 1/3hp for Pond 2. 17. The facilities shall be constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 18. If permeable pavement BUA credit is desired, the permittee must submit a request to modify this permit to incorporate such language as required by the Division. The request to modify must include a proposed amendment to the deed restrictions and protective covenants for the subdivision, and a soils report identifying the type of soil, the Seasonal High Water Table elevation and the infiltration rate. Upon the successful completion of a permit modification, the individual lot owners that request to utilize permeable pavements shall submit the necessary forms and documentation to the permittee, or a designated agent, and receive approval prior to construction of the permeable pavement. III. GENERAL CONDITIONS Any person 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. 2. 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) having jurisdiction. 3. In the event that the facilities fail to perform satisfactorily 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. Additional or replacement stormwater management systems shall receive a permit from the Division prior to construction. Page 5 of 8 State Stormwater Management Systems Permit No. SW8 150905 4. 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 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 Property Owner's Association, subject to the requirements of Session Law 2011-256; c. Bankruptcy; d. Foreclosure; e. Dissolution of the partnership or corporate entity; f. A name change of the current permittee; g. A name change of the project; h. A mailing address change of the permittee; 5. The permittee is responsible for compliance with all permit conditions until such time as the Division approves a request to transfer the permit. 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 permit. 6. The permittee grants DEMLR Staff permission to enter the property during normal business hours for the purpose of inspecting the permitted stormwater management facility. 7. The permit issued shall continue in force and effect until revoked or terminated. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and re -issuance or termination does not stay any permit condition. 8. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 9. Approved plans, specifications, supplement forms, 0&M Agreements and calculations for this project are incorporated by reference and are enforceable parts of the permit. The permittee shall maintain a copy of these documents on file at all times. 10. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws, rules and regulations contained in SL 2006-246, Title 15A NCAC 2H.1000, SL 2008-211 and NCGS 143-215.1 et.al. 11. The permittee shall submit a permit renewal application 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 reissued this the 7th day of June 2017 NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION racy Davi .E., Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Page 6 of 8 State Stormwater Management Systems Permit No. SW8 150905 The Village at Motts Landing Phase 2C Stormwater Permit No. SW8 150907 New Hanover County Designer's Certification Page 1 of 2 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 Page 7 of 8 Certification Requirements: State Stormwater Management Systems Permit No. SW8 150905 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, New Hanover County Building Inspections Page 8 of 8 Permit Number:" 9 crjQ�{ Q 5 IFUM-i(to be prov'ded by DWQ) Drainage Area Number: Wet Detention Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): ❑ does ® does not This system (check one): ❑ does ® does not incorporate a vegetated filter at the outlet. incorporate pretreatment other than a forebay. Important maintenance procedures: - Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). - No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. - Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. - If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. - Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a known set location and must be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem: How I will remediate theproblem: The entire BMP Trash/ debris is present. Remove the trash/ debris. The perimeter of the wet detention basin Areas of bare soil and/or ' erosive gullies have formed. Regrade the soil if necessary to remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer a licati Vegetation is too short or too Main t t f long. _ a ro atel six inches. Form SW401-Wet Detention Basin O&M-Rev.4 DEC°o 0Y. - Pace laf 4 Permit Number: (to be provided by DWO Drainage Area Number: BMP element: Potentialproblem: The inlet device: pipe or The pipe is clogged. swale The pipe is cracked or otherwise damaged. Erosion is occurring in the swale. The forebay Sediment has accumulated to a depth greater than the original design depth for sediment storage. The vegetated shelf The main treatment area Erosion has occurred. Weeds are present. Best professional practices show that pruning is needed to maintain optimal plant health. Plants are dead, diseased or dying. Weeds are present. Sediment has accumulated to a depth greater than the original design sediment storage depth. Algal growth covers over 50% of the area. Cattails, phragmites or other invasive plants cover 50% of the basin surface. Form SW401-Wet Detention Basin O&M-Rev.4 How I will remediate the probl Unclog the pipe. Dispose of the sediment off -site. Replace the pipe. Regrade the swaie if necessary to smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Prune according to best professional practices Determine the source of the problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Consult a professional to remove and control the algal growth. Remove the plants by wiping them with pesticide (do not spray). 9 EGEIV'E JEC 0 6 201 BY: Pale 2 0£4 Permit Number: (to be provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs have started to grow on the embankment. Remove shrubs immediately. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on the embankment. Consult a dam safety specialist to remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 4.0 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 3.5 feet in the forebay, the sediment shall be removed. Sediment Removal Bottom 4_5 ] FOREBAv BASIN DIAGRAM (fill in the blanks) L ft Min. Sediment Storage Form SW401-Wet Detention Basin O&M-Rev.4 Permanent Pool Elevation 8.0 Pool \ - - - - Sediment Removal Elevation 4_0- - - - - - - - - - - - -t volume Bottom Elevation 3.0 MAIN POND ECEIVE MAY f 12017 gY; Page 3 of 4 1-ft Storage Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:The Village at Motts Landing Phase 2C BMP drainage area number: l Print name:Arnold L. Sobol Title:Member Manager Address:2020 S. Churchill Drive, Wilmington NC 28403 Signature: IF `,/ �m Date:_����J Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I, IdIa C T�ei ird . a Notary Public for the State of !S,164h "no. , County of P-Pn{,_r-- , do hereby certify that Arvid ( I personally appeared before me this 3 day of� , 2XJ(, and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, SEAL AIJ8%"®Cp My commission expires 1(d Form SW401-Wet Detention Basin O&M-Rev.4 ECF-IVElh DEC 0 6 29113 Brage 4 of 4 Permit Number: < (--1 N 4 CA (to be provided by DWQ) Drainage Area Number: Wet Detention Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): ❑ does ® does not incorporate a vegetated filter at the outlet. This system (check one): ❑ does ® does not incorporate pretreatment other than a forebay. Important maintenance procedures: - Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). - No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. - Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. - If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. - Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a known set location and must be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem: ,How I will remediate theproblem: The entire BMP Trash/ debris is present. Remove the trash/ debris. The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to detention basin erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Vegetation is too short or too Maintain vegetation at a height of long. approximatelv six inches. Form SW401-Wet Detention Basin O&M-Rev.4 CVt=IVt:: DEC 0 NO o 6Y: Permit Number: (to be provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The inlet device: pipe or swale The pipe is clogged. Unclog the pipe. Dispose of the sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale if necessary to Swale. smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The forebay Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design depth for possible. Remove the sediment and sediment storage. dispose of it in a location where it will not cause impacts to streams or the BMP. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional show that pruning is needed practices to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The main treatment area Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design sediment possible. Remove the sediment and storage depth. dispose of it in a location where it will not cause impacts to streams or the BMP. Algal growth covers over Consult a professional to remove 50% of the area. and control the algal growth. Cattails, phragmites or other Remove the plants by wiping them invasive plants cover 50% of with pesticide (do not spray). the basin surface. ECEIVE DEC 0 6 20110 Form SW401-Wet Detention Basin O&M-Rev.4 OY; page 9 of 4 Permit Number: (to be provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs have started to grow on the embankment. Remove shrubs immediately. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on the embankment. Consult a dam safety specialist to remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 6.0 feet in the maim pond, the sediment shall be removed. When the permanent pool depth reads 2.0 feet in the forebay, the sediment shall be removed. Sediment Removal Bottom BASIN DIAGRAM ill in the blanks) 6_5 Pe anenN ------------------ Volume 5_5 -ft Min. Sediment Storage POREBAY Form SW401-Wet Detention Basin O&M-Rev.4 Permanent Pool Elevation 8.5 Pool \ -----Sediment Removal Elevation 2-5------------- Volume ---ume Bottom Elevation MAIN POND DECEIVE MAY r 1 2017 BY. Page 0f 4 1-ft Storage Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:The Village at Motts Landing Phase 2C BMP drainage area number:2 Print name:Arnold L. Sobol Title:Member Manager Address:2020 S. Churchill Drive, Wilmington NC 28403 Laie:_��v Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I,� I�rLP a Notary Public for the State of r&rrx , County of ?rMey , do hereby certify that Arfdd i ,, g5bd personally appeared before me this 5 day of�P,� ( and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, SEAL $0IARk My commission expires /d—/.T'-Z,! ECEIVE DEC 0 6 2013 BY - Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4 High Density Residential Subdivisions Deed Restrictions & Protective Covenances In accordance with Title 15 NCAC 2H.1000 and S.L. 2006-246, the Stormwater Management Regulations, deed restrictions and protective covenants are required for High Density Residential Subdivisions where lots will be subdivided and sold and runoff will be treated in an engineered stormwater control facility. Deed restrictions and protective covenants are necessary to ensure that the development maintains a "built -upon" area consistent with the design criteria used to size the stormwater control facility. I, Arnold L. Sobol , acknowledge, affirm and agree by my signature below, that I will cause the following deed restrictions and covenants to be recorded prior to the sale of any lot: 1. The following covenants are inters ensure ongoing compliance with State Stormwater Management Permit Numbed ' as issued by the Division of Water Quality under the Stormwater Management Regulations. 2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the stormwater management permit. 3. These covenants are to run with the land and be binding on all persons and parties claiming under them. 4. The covenants pertaining to stormwater may not be altered or rescinded without the express written consent of the State of North Carolina, Division of Water Quality. 5. Alteration of the drainage as shown on the approved plan may not take place without the concurrence of the Division of Water Quality. 6. The maximum allowable built -upon area per lot is 5, 000 square feet. 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. 7. Each lot will maintain a 30** foot wide vegetated buffer between all impervious areas and surface waters. **50 foot for projects located in the 20 coastal counties. 8. All runoff from the built -upon areas on the lot must drain into the permitted system. This may be accomplished through a variety of means including roof drain gutters which drain to the street, grading the lot to drain toward the street, or grading perimeter swales to collect the lot runoff and directing them into a component of the stormwater collection system. Lots that will naturally drain into the system are not required to provide these additional measures. Signatu &,W- 4 �4_ I, Della C. Baird , a Notary Public in the State of North Carolina , County of Pender , do hereby certify that Arnold L. Sobol personally appeared before me this the E3 day of , 2016�, and acknowledge the due execution of the foregoing instrument. Witness my hand a!Iq..9•�ficial seal, Signature My Commission expires 1011512-to Ai" t5A IDEC 0 6 Form DRPC-3 Rev.2 05Nov2009 Page 1 of 1 ' DEMLR USE ONLY Date Received Fee Paid Permit Number Applicable Rules": ❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph II - Post Construction (select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan ❑ Other WQ M mt Plan: State of North Carolina Department of Environment and Natural Resources Division of Energy, Mineral and Land Resources STORMWA'I'ER 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 Village at Motts Landing Phase 2C 2. Location of Project (street address): 5625 River Road City:Wilmington County:New Hanover Zip:28412 3. Directions to project (from nearest major intersection): From the intersection of Sanders Road (SR1187) and Motts Village Road (SR 2427), travel approx 01 mile north. Turn right onto Motts Forest Road and travel 0.2 mile east to Grand Champion Road 4. Latitude:34* 07' 36" N Longitude:770 54' 00" 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 numberSW8150905 , its issue date (if known)2/19/16 and the status of construction: ®Not Started ❑Partially Completed* ❑ 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 application or a letter from DEMLR requesting a state stormwater management permit application, Iist the stormwater project number, if assigned, and the previous name of the project, if different than currently proposed, 4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑CAMA Major ®Sedimentation/Erosion Control: _ ❑NPDES Industrial Stormwater M404/401 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: 5. Is the project located within 5 miles of a public airport? ®No ❑ If yes, see S.L. 2012-200, Part VI: htt ortal.ncdenr.or web lr rules -and -re ulat� �C trot,1 Form SWU-101 Version Oct. 31, 2013 Page 1 of 6 III, CONTACT INFORMATION a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee, designated government official, individual, etc. who owns the projecfl: Applicant/Organization:Aftew Properties, LLC Signing Official & Title:Arnold L. Sobol, Member Manager b. Contact information for person listed in item 1a above: Street Address:2020 S. Chruchill Drive City:Wilrnington State:NC Zip:28403 Mailing Address (if applicable): City: State: Zip: Phone: (910 ) 763-2629 Fax: (910 ) 763-4742 Email:lobos251®aol.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 informations for person listed in item 2a above: Street Address: City: State: Zip: Mailing Address (if applicable): City: Phone: Email: State: Zip: Fax: ( 1 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 & Title: b. Contact information for person listed in item 3a above: Mailing Address: City: State: Zip: Phone: ( ) Fax: Email: 4. Local jurisdiction for building permits: New Hanover Coun C Point of Contact: Phone #: l� DEC A 6 20ri BY, Form SWU-101 Version Oct. 31, 2013 Page 2 of 6 IV. PROJECT INFORMATION 1. In tht space provided below, briefly summarize how the stormwater runoff will be treated. two (2) wet detention basins 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 II - Post Construction 3. Stormwater runoff from this project drains to the Cape Fear River basin. 4. Total Property Area: 28.58 acres 5. Total Coastal Wetlands Area: 0 acres 6. Total Surface Water Area: 0 acres 7. Total Property Area (4) - Total Coastal Wetlands Area (5) - Total Surface Water Area (6) = Total Project Area+:28.58 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 Hi h Water (NW line or Mean High Water W) (MHline, and coastal wetlands landward from the NHW (or = 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 = 36.55 % 9. How many drainage areas does the project have?2 (For high density, count I for each proposed engineered stormwater BMP. For low density and other projects, use I 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. 4!119� �Drxtvx &gNO Basin Information Draina a Area 1 Drainage Area 2 Drainage Area Draina a Area Receiving Stream Name Motts Creek Motts Creek _ _ Stream Class * C;Sw C;Sw Stream Index Number * 18-82 18-82 Total Drainage Area (sf) 448,579 665,808 On -site Drainage Area (sf) 448,579 665,808 Off -site Drainage Area (sf) 0 0 Proposed Impervious Area** s 170,020 285,050 % Impervious Area** total 37.9 42.8 Impervious' Surface Area Drainage Area 1 Drainage Area 2 Drainage Area Drainage Area On -site Buildings/Lots (sf) 180,000 _ _ On -site Streets (sf) 62,155 56,105 On -site Parking (sf) 0 0 On -site Sidewalks (sf) 7,865 8,345 Other on -site (sf) 0 25,600 Future (so 0 15,000 M r Off -site (sf) 0 0 0 BY: Existing BUA*** (sf) 0 Total (sf): 170,020 285,050 Stream Class and Index Number can be determined at: http://aortal.ncdenr.org/zoeb/wg�ps/csu/classi cations Imppervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. 'Report only that amount of existing BUA that will remain after development. Do not report any existing BUA that is to be removed and which will be replaced by new B UA. Form SWU-101 Version Oct. 31, 2013 Page 3 of 6 11. How was the off -site impervious area listed above determined? Provide documentation. NA Proiects in Union County: Contact DEMLR Central Office 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 1 SA 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/bmv-manual. 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 htW://portal.ncdenr.org/web/wq/ws/su/statesw/forms does. 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 hn://12ortal.ncdenr.org/web/wq/ws/su/statesw/forms does. Initials 1. Original and one copy of the Stormwater Management Permit Application Form. 2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants ('7 Form. (if required as per Part VII below) 3. OriginaI of the applicable Supplement Form(s) (sealed, signed and dated) and O&M agreement(s) for each BMP. 4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to hgp://www.envhelp.org/12a&es/onestol2exl2ress.html 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[' 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 t5h'�jlf receiving stream drains to class SA. waters within 1/2 mile of the site boundary, include the 1/2 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. h. Identify all surface waters on the plans by delineating the normal pool elevation of impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal waters, and any coastal wetlands landward of the MHW or NHW lines. • Delineate the vegetated buffer landward from the normal pool elevation of impounded structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters. 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�' V qualified person. Provide documentation of qualifications and identify the pe made the determination on the plans. I I LJ r..-� n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff c lations. o. Drainage areas delineated (included in the main set of plans, not as a separate ITument). Form SWU-101 Version Oct. 31, 2013 Page 4 of 6 BY' p. Vegetated buffers (where required). 9. Copy of any applicable soils report with the associated SHWT elevations (Please identify ph Ale 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"x11" 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: 3497 Page No: 0245 11. For corporations and limited liability corporations (LLC): Provide documentation from the NC Secretary of State or other official documentation, which supports the titles and positions held by the persons listed in Contact Information, item 1a, 2a, and/or 3a per 15A NCAC 2H.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. hft://www.secretaiy.state.nc.us/CorRorations/CSearch.aspx VIL 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. If 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 http://portal.ncdenr.org/web/lr/state-stormwater- forms does. 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:Phft G. Tripp, P.E. Consulting Firm: Tripp Engineering Mailing Address:419 Chestnut Street City:Wilmin&n Phone: (910 ) 763-5100 Email:tripleng@ec.rr.com State:NC Zip:28401 Fax: (910 ) 763-5631 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 hjpe 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. Form SWU-101 Version Oct. 31, 2013 ECEIVE DEC 0 6 2915 BY: Page 5 of 6 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 td 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 type name of person listed in Contact Information, item 1a) Arnold L. Sobol 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 stoprrIvater rules unde 1W5A N AC 2H .1000 and any other applicable state stormwater requirements. Signature: ,, 0?4 gn Date. I,. f 0. �, a IA a Notary Public for the State of w4h rd,- ozCounty of do hereby certify that Anil L. ' personally appeared before me this 5 day ofaWtWt&/ ��T— and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, A A&- �'�� ��'T APJ- Form SWU-101 Version Oct. 31, 2013 SEAL My commission expires (C'I- (5-ZL ECEIVE DEC 0 6 2910) Page 6 of 6 BY: Permit No.,'i�A'R 150AQ5 (to be provided by DWG) NCDENR 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 Ill) must be printed, filled out and submitted along with all of the required information. 1. PROJECT INFORMATION Project name Contact person Phone number Date Drainage area number 12-Apr-17 1 O�0. W AT�cRWG ll. DESIGN INFORMATION Site Characteristics Drainage area 448,579 le Impervious area, post -development 170,020 f? % impervious 37.90 % Design rainfall depth 1.5 in Storage Volume: Non -SA Waters Minimum volume required Volume provided Storage Volume: SA Waters 1.5" runoff volume Pre -development 1-yr, 24-hr runoff Post -development 1-yr, 24-hr runoff Minimum volume required Volume provided Peak Flow Calculations Is the pre/post control of the 1 yr 24hr storm peak flow required? 1-yr, 24-hr rainfall depth Rational C, pre -development Rational C, post -development Rainfall intensity: )-yr, 24-hrstorm Pre -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Top of 1Oft vegetated shelf elevation Bottom of 1 Oft vegetated shelf elevation Sediment deanout, top elevation (bottom of pond) Sediment cleanout, bottom elevation Sediment storage provided Is there additional volume stored above the state -required temp. pool? Elevation of the top of the additional volume 55,262 ft3 fe fl3 it3 ft Y (Y or N) OK, volume provided is equal to or in excess of volume required. 3.8 in 0.20 (unifless) 0.48 (unitless) 3.90 inlhr OK 8.03 fOlsec 19A5 fOlsec 11.42 fOlsec 10.00 fmsl 8.00 fmsl 7 69 fmsl 8.50 fmsl 7.50 fmsl 3.00 fmsl 2.00 fmsl 1.00 It Y (Y or N) 10.0 fmsl OK �- I�CEIVE MAY r 1 2017 ft Form SW401-Wet Detention Basin-Rev.9-4118/12 Parts I. & II. Design Summary, Page 1 of 2 Permit No. (to be provided by DWQ) I. DESIGN INFORMATION Surface Areas Area, temporary pool 31,987 fe Area REQUIRED, permanent pool 19,289 i SAIDA ratio 4.30 (unitless) Area PROVIDED, permanent pool, A.,,,,_P,,, 20,765 if OK Area, bottom of 1Oft vegetated shelf, AeoLa, j 15,725 if Area, sediment cleanout, top elevation (bottom of pond), Ab,,-p„d 2,476 ft Volumes Volume, temporary pool 55,262 fO OK Volume, permanent pool, V. p,,, 51,034 fO Volume, forebay (sum of forebays if more than one forebay) 10,294 fts Forebay % of permanent pool volume 20.2% % OK SAIDA Table Data Design TSS removal 90 % Coastal SAIDA Table Used? Y (Y or N) Mountain/Piedmont SAIDA Table Used? N (Y or N) SAIDA ratio 4.30 (unitless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10-2b) N (Y or N) Volume, permanent pool, Vo&„y,,, 51,034 ftd Area provided, permanent pool, , p.._pw 20,765 ft< Average depth calculated It Need 3 It min. Average depth used in SAIDA, de,,, (Round to nearest 0.5ft) It Calculation option 2 used? (See Figure 10-2b) Y (Y or N) Area provided, permanent pool, ASP,,, 20,765 fe Area, bottom of 1 Oft vegetated shelf, Ab,t �h"n 15,725 f? Area, sediment cleanout, top elevation (bottom of pond), Ato old 2,476 fe "Depth' (distance b/w bottom of 1Oft shelf and top of sediment) 4.50 it Average depth calculated 3.04 it OK Average depth used in SAIDA, da (Round to down to nearest 0.5ft) 3.0 It OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 2.00 in Area of orifice (N-non-circular) In Coefficient of discharge (Co) 0.60 (unitless) Driving head (H.) 0.83 It Drawdown through weir? N (Y or N) Weir type (unitless) Coefficient of discharge (C.) (unitess) Length of weir (L) It Driving head (H) It Pre -development 1-yr, 24-hr peak flow 8.03 fO/sec Post -development 1-yr, 24-hr peak flow 19.45 Osec Storage volume discharge rate (through discharge orifice or weir) 0.09 J?/sec Storage volume drawdown time 2.96 days OK, draws down in 2-5 days. Additional Information Vegetated side slopes 3 :1 OK Vegetated shelf slope Vegetated shelf width 10 :1 10.0 ft OK E C G I V E OK Length of flowpath to width ratio 3 :1 OK Length to width ratio 3.0 :1 OK MAY 1' 12017 Trash rack for overflow & orifice? Y (Y or N) OK Freeboard provided 1.0 It OK Vegetated filter provided? N (Y or N) OK BY' Recorded drainage easement provided? Y (Y or N) OK Capures all runoff at ultimate build -out? Y (Y or N) OK Drain mechanism for maintenance or emergencies is: pump Form SW401-Wet Detention Basin-Rev.9-4/18/12 Parts I. & II. Design Summary, Page 2 of 2 Permit No. (to be provided by DWQ) NCDENR 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 /I/) must be printed, filled out and submitted along with all of the required information, I. PROJECT INFORMATION Project name 4 Contact person Phone number Date Drainage area number Village at Motts landing Phase 2C Phillip G. Tnpp, PE 910-763-5100 23-Feb-17 2 IL DESIGN INFORMATION Site Characteristics Drainage area 665,808 ftz Impervious area, post -development 285,050 ft % impervious 42.81 % Design rainfall depth 1.5 in Storage Volume: Non -SA Waters Minimum volume required Volume provided Storage Volume: SA Waters 1.5" runoff volume Pre -development 1-yr, 24-hr runoff Post -development 1-yr, 24-hr runoff Minimum volume required Volume provided Peak Flow Calculations Is the pre/post control of the 1yr 24hr storm peak flow required? 1-yr, 24-hr rainfall depth Rational C, pre -development Rational C, post -development Rainfall intensity: 1-yr, 24-hr storm Pre -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Top of 1 Oft vegetated shelf elevation Bottom of 1Oft vegetated shelf elevation Sediment deanout, top elevation (bottom of pond) Sediment deanout, bottom elevation Sediment storage provided Is there additional volume stored above the state -required temp, pool? Elevation of the top of the additional volume OF W A r�9 o� 36,229 W 41,776 ff3 OK, volume provided is equal to or in excess of volume required. uo Y (Y or N) 3.8 in 0.20 (unitiess) 0.52 (unitless) 3.90 in/hr CK 11.92 It Isec 31.06 fFisec 19.14 ft3/sec 10.00 fmsl 8.50 fmsl 8.84 fmsl 9.00 fmsl 8.00 fmsl 1.50 fmsl 0.50 fmsl 1.00ft ECEIVE Y (Y N) 10.0 fmsll OK MAY r 1 2017 BY: Form SW401-Wet Detention Basin-Rev.9-4118/12 Parts I. & H. Design Summary, Page 1 od 2 Permit No. (to be provided by O WQ) IL DESIGN INPORMATION Surface Areas Area, temporary pool 30,317 ft' Area REQUIRED, permanent pool 23,570 ft2 SAIDA ratio 3.54 (unitless) Area PROVIDED, permanent pool, AP,,,,_,,,, 23,701 ft2 OK Area, bottom of i Oft vegetated shelf, Ab,t,,,,,, 19,828 ft2 Area, sediment cleanout, top elevation (bottom of pond), Ab, ,.d 3,431 f12 Volumes Volume, temporary pool 41,776 ft- OK Volume, permanent pool, Vb,,,,�,,, 78,628 ft' Volume, forebay (sum of forebays if more than one forebay) 15,441 fP Forebay % of permanent pool volume 19.6% % OK SAIDA Table Data Design TSS removal 90 % Coastal SAIDA Table Used? Y (Y or N) Mountain/Piedmont SAIDA Table Used? N (Y or N) SAIDA ratio 3.54 (unitless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10-2b) N (Y or N) Volume, permanent pool, V,& _P,,, 78,628 ft' Area provided; permanent pool, A,,,,_p,,, 23,701 ft2 Average depth calculated It Need 3 ft min, Average depth used in SAIDA, d,,, (Round to nearest 0.5ft) ft Calculation option 2 used? (See Figure 10-2b) Y (Y or N) Area provided, permanent pool, A,,,,,,,, 23,701 ft2 Area, bottom of 1Oft vegetated shelf, Ab„ ,h 19,828 f? Area, sediment cleanout, top elevation (bottom of pond), Ab„_ , 3,431 ft2 "Depth" (distance b/w bottom of 10ft shelf and top of sediment) 6.50 ft Average depth calculated 4.27 it OK Average depth used in SAIDA, dN, (Round to down to 4.3 ft OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 2.50 in Area of orifice (if -non -circular) in Coefficient of discharge (C.) 0.60 (unitless) Driving head (H,) 1.13 ft Drawdown through weir? N (Y or N) Weir type (unitless) Coefficient of discharge (C„,) (unitless) Length of weir (L) ft Driving head (H) It Pre -development 1-yr, 24-hr peak flow 11.92 ft3/sec Post -development 1-yr, 24-hr peak flow 3106 ft/sec Storage volume discharge rate (through discharge orifice or weir) 012 ft3/sec Storage volume drawdown time 3.61 days OK, draws down in 2-5 days. Additional Information Vegetated side slopes 3 :1 OK Vegetated shelf slope 10 :1 OK Vegetated shelf width 10.0 ft OK C C C C G I V G Length of flowpath to width ratio 3 :1 OK Length to width ratio Trash rack for & 30 :1 CK MAY aai� overflow orifice? Y (Y or N) OK Freeboard provided 10 it OK Vegetated filter provided? N (Y or N) OK BY: Recorded drainage easement provided? Y (Y or N) OK Capures all runoff at ultimate build -out? Y (Y or N) OK Drain mechanism for maintenance or emergencies is: pump Form SW401-Wet Detention Basin-Rev.g-4/18112 Parts I. & 11. Design Summary, Page 2 of 2 High Density Residential Subdivisions Deed Restrictions & Protective Covenances In accordance with Title 15 NCAC 2H.1000 and S.L. 2006-246, the Stormwater Management Regulations, deed restrictions and protective covenants are required for High Density Residential Subdivisions where lots will be subdivided and sold and runoff will be treated in an engineered stormwater control facility. Deed restrictions and protective covenants are necessary to ensure that the development maintains a "built -upon" area consistent with the design criteria used to size the stormwater control facility. I, Arnold L. Sobol , acknowledge, affirm and agree by my signature below, that i will cause the following deed restrictions and covenants to be recorded prior to the sale of any lot: The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Numbeyl�b���'.�as issued by the Division of Water Quality under the Stormwater Management Regulations. 2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the stormwater management permit. 3. These covenants are to run with the land and be binding on all persons and parties claiming under them. 4. The covenants pertaining to stormwater may not be altered or rescinded without the express written consent of the State of North Carolina, Division of Water Quality. 5. Alteration of the drainage as shown on the approved plan may not take place without the concurrence of the Division of Water Quality. 6. The maximum allowable built -upon area per lot is 5.000 square feet. 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 In RECEIVE 7. Each lot will maintain a 30** foot wide vegetated buffer between all impe us j anaerfa waters. UU �tii 55 **50 foot for projects located in the 20 coastal counties. BY 6. All runoff from the built -upon areas on the lot must drain into the permitted system. This may be accomplished through a variety of means including roof drain gutters which drain to the street, grading the lot to drain toward the street, or grading perimeter swales to collect the lot runoff and directing them into a component of the stormwater collection system. Lots that will naturally drain into the system are not required to provide these additional measures. Signature: LIA Date: �7- /J I, Della C. Baird J a Notary Public in the State of North Carolina , County of Pender , do hereby certify that Arnold L. Sobol personally appeared before me this the day of 12015 and acknowledge the due execution of the foregoing instrument. Witness my hand and official seal, ,0 00.1111- 0!1.04% n / ®�.* TA lzz& r && C� BEAD . ® �/. Signature'= _ U".. My Commission expires 10/15/16 Form DRPC-3 Rev.2 05Nov2009 Page 1 of 1