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HomeMy WebLinkAboutSW8150113_Current Permit_20160318Energy, Mineral and Land Resources ENVIRONMENTAL QUALITY March 18, 2016 Mr. Arnold Sobol, Manager Aftew Properties, LLC 2020 S. Churchill Dr. Wilmington, NC 28403 Subject: Approved Plan Revision The Village at Motts Landing Phase 2B Stormwater Permit No. SW8150113 New Hanover County Dear Mr. Sobol: PAT MCCRORY Governor DONALD R. VAN DER VAART Secretary TRACY DAVIS Director On March 8, 2016, the Wilmington Regional Office received a compete request to revise the approved plans for Stormwater Management Permit Number SW8 150113. The revisions include using the 5,000 square feet of future impervious area available within the drainage area for Pond 1 to create Lot 96 as well as to adjust the layout of lots 241 thru 244. It has been determined that a formal permit modification is not required for the proposed changes. We are forwarding you an approved copy of the revised plans for your files. Please replace the old approved plan sheets with the new ones. Please replace the previously issued permit with the revised permit, dated March 18, 2016, attached. Please be aware that all terms and conditions of the permit previously issued on March 18, 2015, remain in full force and effect, including the requirement to revise or amend the recorded deed restrictions with the updated built -upon area allocations. Please also understand that the approval of this revision to the approved plans and permit for the subject State Stormwater project is done on a case -by -case basis. Any other changes to this project must be approved through this Office prior to construction. The issuance of this plan revision does not preclude the permittee from complying with all other applicable statutes, rules, regulations or ordinances which may have jurisdiction over the proposed activity, and obtaining a permit or approval prior to construction. If you have any questions concerning this matter, please do not hesitate to call Christine Hall at (910) 796-7215. Sine ely, �� Tracy Da is, P.E., Director Division of Energy, Mineral and Land Resources GDS\canh: \\\Stormwater\Permits & Projects\2015\150113 HD\2016 03 permit_pr 150113 cc: Monica Valsi, Tripp Engineering New Hanover County Building Inspections Wilmington Regional Office State of North Carolina I Environmental Quality I Energy, Mineral and Land Resources 127 Cardinal Drive Extension I Wilmington, NC 28405 910 796 7215 T 1 nin 11n onnn R u--- u� .'`"..�.^;.,a,� ;r.BrC :mb^.-/ State Stormwater Management Systems Permit No. SW8150113 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 Motts Landing Phase 2B 5818 Carolina Beach Rd, Wilmington, New Hanover County FOR THE construction, operation and maintenance of two (2) wet detention ponds and one (1) infiltration basin in compliance with the provisions of 15A NCAC 2H .1000 and Session Law 2008-211 (hereafter separately and collectively 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 and considered a part of this permit. This permit shall be effective from the date of issuance until March 18, 2023 and shall be subject to the following specified conditions and limitations: 1. DESIGN STANDARDS 1. 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 89 lots, each limited to a maximum amount of built -upon area as indicated in Section 11.14 (f) of this permit. 3. This stormwater system has been approved for the management of stormwater runoff as described in Sections 1.8 and 1.9 of this permit. The runoff from all built -upon area within the permitted drainage area(s) of this project must be directed into the permitted stormwater control systems. The best management practices designated as Pond 1, Pond 2, and the Infiltration Basin, have been designed to treat the runoff from 264,600 square feet, 208,930 square feet, and 41,625 square feet of impervious area, respectively. 4. The maximum built -upon area -allowed for the entire subdivision is 515,155 square feet. 5. The drainage areas will be limited to the amounts of built -upon area indicated in Sections 1.3, 1.8, and 1.9 of this permit, and per approved plans. _.. neS iti - allocation I}" 6. 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 1 of 12 State Stormwater Management Systems Permit No. SW8150113 7. The infiltration basin can store at least 2.5 times the minimum design storm, therefore neither an LSNFS nor an offline bypass are required. 8. The following design elements have been permitted for the wet detention pond stormwater facilities, and must be provided in the system at all times. Pond 1 Pond 2 a. Drainage Area, acres: Onsite, ft2: Offsite, ft2: b. Total Impervious Surfaces, ft2: Lot BUA: Roads/Parking: Other: Future: C. Average Pond Design Depth, ft: d. TSS Removal Efficiency, %: e. Design Storm f. Permanent Pool Elevation, fmsl: g. Permitted Surface Area at Permanent Pool, ft2: h. Permitted Temporary Storage Volume, ft3: i. Permitted Temporary Storage Elevation, fmsl: j. Pre -Development 1yr24hr Discharge Rate, cfs: k. Controlling Orifice, in: I. Orifice Flowrate, cfs: m. Permanent Pool Volume, ftj: n. Forebay Volume, ft3: o. Max Fountain Horsepower: p. Receiving Stream / River Basin: q. Stream Index Number: r. Classification of Water Body: 14.21 8.56 618,780 373,050 0 0 264,600 208,930 f 140,000 193,000 62,450 60,440 9,150 8,490 0 0 3.50 6.00 90% 90% 1.50 1.50 14.50 23.50 29,447 12,563 50,862 40,075 16.00 26.00 11.08 6.68 3.00 2.00 0.17 0.10 92,721 50,497 17,501 10,311 1/3 1/4 Motts Creek / Cape Fear 18-82 C; SW 9. The following design elements have been approved for the infiltration basin 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: Lots ft2: Roads/Parking, ft2: Other, ft2: Offsite, ft2: C. Basin Depth, feet: d. Design Storm: e. Bottom Elevation, FMSL: f Permitted Surface Area @Bottom, ft2: g Permitted Storage Volume, ft3: h. Storage/Bypass Elevation, FMSL: i Type of Soil: j. Expected Infiltration Rate, in/hr: k. Time to Draw Down, hours: I. Receiving Stream / River Basin: m. Stream Index Number: n. Classification of Water Body: 1.93 83,910 0 41,625 28,000 12,150 1,472 0 3.0 1.5 25.0 6,077 18,231 28.0 Sand 5.40 0.40 Motts Creek / Cape Fear 18-82 "C; SW" Page 2 of 12 State Stormwater Management Systems Permit No. SW8150113 II. SCHEDULE OF COMPLIANCE 1. No person or entity, including the permittee, shall alter any component of the approved stormwater system shown on the approved plans unless and until the Division has approved of the revised plan. 2. 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. 3. The permittee shall review all individual proposed and modified lot plans 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. 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. 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. Page 3 of 12 State Stormwater Management Systems Permit No. SW8150113 10. 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. 11. 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. 12. 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. 13. The facilities shall be constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 14. 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 150113, 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 State of North Carolina, Division of Energy, Mineral and Land Resources. e. Alteration of the drainage as shown on the approved plans may not take place without the concurrence of the Division of Energy, Mineral and Land Resources. f. The maximum built -upon area per lot is as specified 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 25-74, 87-92: 3,500sf Lots 93-96, 227-255: 5,000sf g. 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. h. Built -upon area in excess of the permitted amount will require a permit modification. i. 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. j. 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. 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. Page 4 of 12 State Stormwater Management Systems Permit No. SW8150113 16. If the wet pond's 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 1/3hp for Pond 1 and 1/4hp for Pond 2. 17. 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. 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. 111. 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 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; 2. 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. 3. Any person or entity found to be in noncompliance with the terms and conditions of a stormwater management permit or the stormwater rules is subject to enforcement action as outlined in NCGS 143, Article 21. 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) having jurisdiction. Page 5of12 State Stormwater Management Systems Permit No. SW8150113 5. 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. 6. The permittee grants Division 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, O&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 Session Law 2006-246, Title 15A NCAC 2H.1000, 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 revised, updated, and re -issued this the 18t' day of March 2016. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION -T-1-zd ,Tracy Davis, .E., Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Permit Number SW8 150113 Page 6 of 12 State Stormwater Management Systems Permit No. SW8150113 The Village at Motts Landing Phase 2B — Wet Pond 1 Page 1 of 2 Stormwater Permit No. SW8 150113 New Hanover County Designer's Certification 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 12 State Stormwater Management Systems Permit No. SW8150113 Certification Requirements (Wet Pond 1): 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 12 State Stormwater Management Systems Permit No. SW8150113 The Village at Motts Landing Phase 2B — Wet Pond 2 Page 1 of 2 Stormwater Permit No. SW8 150113 New Hanover Countv Designer's Certification 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 9 of 12 State Stormwater Management Systems Permit No. SW8150113 Certification Requirements (Wet Pond 2): 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 10 of 12 State Stormwater Management Systems Permit No. SW8150113 The Village at Motts Landing Phase 2B - Infiltration Basin Page 1 of 2 Stormwater Permit No. SW8 150113 New Hanover County Designer's Certification 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 are a part of this Certification. Noted deviations from approved plans and specifications: Signature Registration Number Date SEAL Page 11 of 12 State Stormwater Management Systems Permit No. SW8150113 Certification Requirements (Infiltration Basin): 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. The 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 level spreader / vegetated filter strip. 15. The required dimensions of the system are provided, per the approved plan. cc: NCDEQ-DEMLR Wilmington Regional Office New Hanover County Building Inspections Page 12 of 12 Permit Number: -(0 9 (to be rov Wed by DW I) 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 darn 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 � Coastal County). Records of operation and maintenance should be twin a known set location and must be available upon request. JAN 16 2015 Inspection activities shall be performed as follows. Any problems th4tr-e-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. approximately six inches. Form SW401-Wet Detention Basin O&M-Rev.4 Page 1 of 4 Permit Number: :? (to be provided by DWQ) Drainage Area Number: Qnro01 BMP element: Potentialproblem: How I will remediate theproblem: The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the Swale 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 spray in . 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, ph.ragmites or other. Remove the plants by wiping them i invasive plants cover 50% of with pesticide (do not spray). the basin surface. „M G.. EIVI= JAN 16 285 11 Form SW401-Wet Detention Basin O&M-Rev.4 8Y: of 4 Permit Number: O W-3 \ S0 %% 3 (to be pAovided by DWQ) Drainage Area Number: iN 0) BMP element: Potentialproblem: How I will remediate the roblem: 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 3.5 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 BASIN DIAGRAM Vll in the blanks) Permanent Pool Elevation 14.50 11.0 /Pe anen Pool ---------------Volume Sediment Removal Elevation 11.0 Volume Min. -------------------------------------------- ---ediment Bottom Elevation 10.0 1-ft n Storage Sedimei FOREBAY MAIN POND Storage Form SW401-Wet Detention Basin O&M-Rev.4 ECEIVE JAN 16 2015 BY: Page of 4 Permit Number: -3 votk2j (to e provided by DWQ) Qan1q, 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 2E BMP drainage area number:l Print name:Arnold L. Sobol Title:Member Manager Address:2020 S. Churchill Drive Wilmington NC 28403 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. a Notary Public for the State of orAh CpmUiv, , County of T{ ord eT , do hereby certify that old L, �( personally appeared before me this. day of W15 , and acknowledge the due execution of the forgoing wet dete ion basin maintenance requirements. Witness my hand and official seal, Z't#'A_ C P&rf — TA � >s •o�':.AtIB1.%G SEAL My commission expires M--/f-A. EC IVE JAN 16 2015 BY: — Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4 Permit Number: (to be provided by DWG) Drainage Area Number: r10' 6 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 1 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 I 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. approximately si ' Form SW401-Wet Detention Basin O&M-Rev.4 JAN 16 2055 age I of 4 �v Permit Number: S UR j So 11'S (to be ovided by DWO) Drainage Area Number: JN BMP element: Potentialproblem: How I will remediate the problem - The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the swale sediment off -site. The pipe is cracked or I Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale if necessary to swale. smooth it over and provide erosion j control devices such as reinforced l I turf matting or riprap to avoid i 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 spray in . 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. axed control the algal growth. Cattails, phragmites or other invasive plants cover 50% of I Remove the plants by wiping them with pesticide (do not spray). the basin surface. GIVE JAN 16 2015 Form SW401-Wet Detention Basin O&M Rev.4 ri Pag of 4 BY: Permit Number: DW$ le Ol13 (to be prKided by DWQ) Drainage Area Number:_ YO %M I,---- BMP element: Potential roblem: Plow 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 Consult a dam safety specialist to the embankment. 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 10.0 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 3.0 feet in the forebay, the sediment shall be removed. Sediment Removal Bottom FOREBAY BASIN DIAGRAM ill in the blanks) i ft Min. Sediment Storage Form SW401-Wet Detention Basin O&M-Rev.4 Permanent Pool Elevation 23.5 Pool \-..... Sediment Removal Elevation 13.5------------ I Volume Bottom Elevation MALL POND RJECEIVE JAN 16 2015 BY' Page 3 of 4 1-ft Storage Permit Number: p to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the poU AZ 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 2B BMP drainage area number:2 Print name:Arnold L. Sobol Title:Member Manager Address:2020 S. Churchill Drive, Wilmington NC 28403 Phon SignE 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. 1, 0.�—RaA , a Notary Public for the State of N 15d,6 ('r1,.1(�i ,'rV, , County of do hereby certify that AnM L . 5�bd personally appeared before me this 7 day of I A 2p),S , and acknowledge the due execution of the forgoing wet detentiol basin maintenance requirements. Witness my hand and official seal, 11A4, 1 / , a C 1. ,1oorAJVj' A11B0 -"NINIHIINNN�"- SEAL 0IE JAN 16 2015 My commission expires /d —/S__1 (o BY. Form SW401-Wet Detention Basin O&M-Rev.4 page 4 of 4 Permit Number: (to be provided by DWQ) Drainage Area Number: Infiltration 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. Important maintenance procedures: — The drainage area will be carefully managed to reduce the sediment load to the infiltration basin. — Immediately after the infiltration basin is established, the vegetation will be watered twice weekly if needed until the plants become established (commonly six weeks). No portion of the infiltration basin will be fertilized after the initial fertilization that is required to establish the vegetation. The vegetation in and around the basin will be maintained at a height of approximately six inches. After the infiltration basin is established, it will be inspected once a quarter 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 will be kept in a known set location and will 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 Areas of bare soil and/or Regrade the soil if necessary to infiltration 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. The inlet device: pipe or The pipe is clogged (if Unclog the pipe. Dispose of the Swale applicable). sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged (if applicable). Erosion is occurring in the Regrade the swale if necessary to swale (if applicable). smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid I i i future problems with erosion. ECEIV JAN 16 2015 Form SW401-Infiltration Basin O&M-Rev.3 BY: e 1 of 3 BMP element: Potentialproblem: How I will remediate theproblem: The forebay Sediment has accumulated Search for the source of the and reduced the depth to 75% of the original design depth. sediment a. -id remedy the problem if possible. Remove the sediment and dispose of it in a location where it Will not cause impacts to streams or I I the BMP. Erosion has occurred or Provide additional erosion riprap is displaced. 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 pesticides are used, wipe them on the plants rather than spraying. The main treatment area A visible layer of sediment Search for the source of the has accumulated. 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. Replace any media that was removed in the process. Revegetate disturbed areas immediately. Water is standing more than Replace the top few inches of filter 5 days after a storm event. media and see if this corrects the standing water problem. If so, revegetate immediately. If not, consult an appropriate professional for a more extensive repair. Weeds and noxious plants are Remove the plants by hand or by growing in the main wiping them with pesticide (do not treatment area. spray). The embankment Shrubs or trees have started Remove shrubs or trees to grow on the embankment. immediately. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. 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 NC Division of Water damage have occurred at the outlet. Quality 401 Oversight Unit at 913- 1733-1786. ECEIVE I JAN 16 2015 Form SW401-Infiltration Basin O&M-Rev.3 BY. Page 2 of 3 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 2B BMP drainage area number:3 Print name:Arnold L. Sobol Title:Member Manaizer Address:2020 S. Churchill Drive, Wilmington, NC 28403 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 beer, named the president. I, t elk C . qi rd , a Notary Public for the State of )icyjh CArbUn __ , County of3eMer , do hereby certify that krnzW L, personally appeared before me this day of , z6 �, and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand and official seal, SEAL My commission. expires 1D �L� l� ECEIVE JAN 16 2415 BY: Form SW401-Infiltration Basin O&M-Rev.3 Page 3 of 3 DEMUR USE ONLY Date eceive Fee Paid (express o d Permit Number Z, 2 ZZ—/1-S —t-!5�1— L�2< OF/7-3 State of North Carolina Department of Environment and Natural Resources Division of Energy, Mineral and Land Resources STORMWATER MANAGEMENT PERMIT PLAN REVISION APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION 1. Stormwater Management Permit Number: SW8150113 2. Project Name: The Village at Motts Landing Phase 2B 3. Permit Holder's name (specify the name of the corporation, individual, etc.): Aftew Properties, LLC 4. Print Owner/Signing Official's name and title (person legally responsible for permit): Arnold Sobol, Manager 5. Mailing Address for person listed in item 2 above: 2020 S. Churchill Drive City:Wilmington State:NC Zip:28403 Phone: (910 ) 763-2629 Fax: (910 ) 763-4742 Email: lobos251®aol.com E G E I V EIIA oh II. PLAN REVISION INFORMATION 1. Summarize the plan revision proposed (attach additional pages if needed): DEC a J. 2015 allocated in previous permit. III. 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. The complete application package should be submitted to the DEMLR Office that issued the permit. 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original & 1 copy of the Plan Revision Application Form • Two (2) copies of revised plans (must be revisions of original approved plan sheet(s)) If applyin for Express review (only available in 20 coastal counties • Application fee of $500.00 (made payable to NCDENR) NA - VI. APPLICANT'S CERTIFICATION I, (print or type name of person listed in General Information, item 311 Arnold Sobol certify that I have authorized these plan revisions and that the information included on this plan revision applicationMe best of y knowl dgeject and complete. �J Signature: Date: Plan Revision Form Rev. Oct. 31, 2013 Permit No (/�: Ito be provided by DWQ) A VANCDENR 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 111) must be printed, filled out and submitted along with all of the required information. L PROW INFORMATION O��F WAT�c9pG Project name Village at Motts Landing Phase 2B Contact person Phillip G Tripp, PE Phone number 910-763-5100 Date 12130/2014 Drainage area number 1 fL pES1GN INFORMATION Site Characteristics Drainage area 618,780 fe Impervious area, post -development 264,600 fe % impervious 42.76 % 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 lyr 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 PrelPost 1-yr, 24-hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Too of 1 Oft veoetated shelf elevation Bottom of 1 Oft vegetated shelf elevation Sediment cleanout, 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 tie top of the additionai volume 33,635 ft3 50,862 ft3 OK, volume provided is equal to or in excess of volume required. ft3 ft ft fe to _ (Y or N) 3.8 in 0.20 (unitless) 0.41 (unitless) 3.90 in/hr OK 11.08 fe/sec 22.71 fP/sec 11.63 ft3/sec 16.00 fmsl 14.50 fmsl 15 03 fmsl 15.00 fmsl 14 00 fmsl 10.00 fmsl 9.00 fmsl 1.00 ft N (Y or N) tmsl ECE1yE JAN 16 Z0� D BY:_ Form SW401-Wet Detention Basin-Rev.9-4118/12 Parts I.6II. Design Summay, Page 1 of 2 Permit No. (to be provided by DWQ) IL DESIGN MFORMAn..ii Surface Areas Area, temporary pool 36,418 f? Area REQUIRED, permanent pool 26,608 f? SAIDA ratio 4.30 (unitless) Area PROVIDED, permanent pool, APw, _,d 29,447 W OK Area, bottom of 1 Oft vegetated shelf, AbtSher 25,480 ff Area, sediment cleanout, top elevation (bottom of pond), Abo,-p d 12,942 fe Volumes Volume, temporary pool 50,862 ft3 Volume, permanent pool, Vim,,,_p, 92,721 ft' Volume, forebay (sum of forebays if more than one forebay) 17,501 ft3 Forebay % of permanent pool volume 18.946 % SAIDA Table Data Design TSS removal Coastal SAIDA Table Used? Mountain/Piedmont SAIDA Table Used? SAIDA ratio Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10-2b) Volume, permanent pool, VPB -P, Area provided, permanent pool, Ap.-p d Average depth calculated Average depth used in SA/DA, dB1,, (Round to nearest 0.5ft) Calculation option 2 used? (See Figure 10-2b) Area provided, permanent pool, Aper,„y,d Area, bottom of 1 Oft vegetated shelf, Abr o n 90 % Y (Y or N) N (Y or N) 4.30 (unitess) N (YorN) 92,721 ftd 29,447 ff ft ft Y (Y or N) 29,447 if 25,480 if Area, sediment cleanout, top elevation (bottom of pond), AbwL nd 12,942 fe 'Depth' (distance b/w bottom of 10ft shelf and top of sediment) 4.00 ft Average depth calculated 348 It Average depth used in SAIDA, d,,,, (Round to down to nearest 0.5ft) 3.5 ft Drawdown Calculations Drawdown through orifice? Diameter of orifice (if circular) Area of orifice (if -non -circular) Coefficient of discharge (Co) Driving head (He) Drawdown through weir? Weir type Coefficient of discharge (Cw) Length of weir (L) Driving head (H) Pre -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Storage volume discharge rate (through discharge orifice or weir) Storage volume drawdown time 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: OK OK Need 3 ft min. OK OK Y (Y or N) 3.00 in in' 0.60 (unitless) 0.92 It N (YorN) (unitless) (unitless) ft ft 11.08 ft3/sec 2715 flIsec 0.17 fe/sec 2.33 days OK, draws down in 2-5 days. 3 :1 OK 10 :1 OK 10.0 It OK 3:1 OK ECEI 2.0 :1 OK �A' E Y (YorN) 1.0ft OK OK JAN 16 2015 N (Y or N) OK Y (Y or N) OK BY. Y (Y or N) OK pump Form SW401-Wet Detention Basin-Rev.9-4/18/12 Parts I. & H. Design Summary, Page 2 of 2 Permit No. (to be provided by DWQ) 111. REQUfRM ! w-EMS CHECKS ➢S Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page/ Plan Initials Sheet No. �U C3, C8 1. Plans (1" 50' or larger) of the entire site showing: - Design at ultimate build -out, - Off -site drainage (if applicable), - Delineated drainage basins (include Rational C coefficient per basin), - Basin dimensions, Pretreatment system, - High flow bypass system, - Maintenance access, Proposed drainage easement and public right of way (ROW), Overflow device, and Boundaries of drainage easement. !vl cV C3, C8 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing: - Outlet structure with trash rack or similar, - Maintenance access, - Permanent pool dimensions, Forebay and main pond with hardened emergency spillway, Basin cross-section, Vegetation specification for planting shelf, and - Filter strip. +� C8 3. Section view of the wet detention basin (1" 20' or larger) showing: Side slopes, 3:1 or lower, Pretreatment and treatment areas, and - Inlet and outlet structures. 1 I vl W C9 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified on the plans prior to use as a wet detention basin. MQU attached 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. K11_ C9 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. attached 7. The supporting calculations. MU/— attached 8. A copy of the signed and notarized operation and maintenance (0&M) agreement. A UZ attached 9. A copy of the deed restrictions (if required). _ attached 10. A. soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County soil maps are not an acceptable source of soils information. CCEIVE JAN 16 2015 Form SW401-Wet Detention Basin-Rev.9-4/18/12 III. Required Items Checklist, Page 1 of Permit %���1� (to be provided by DWQ) o=ors W A r��', p, 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 111) must be printed, filled out and submitted along with all of the required information. 1. PROJECT INFORMATION Project name Village at Motts Landing Phase 2B Contact person Phillip G. Tripp, PE Phone number 910-763-5100 Date 12/30/2014 Drainage area number 2 Drainage area 373,050 fe Impervious area, post -development 208,930 fe % impervious 56.01 % Design rainfall depth 1.5 in Storage Volume: Non -SA Waters Minimum volume required 25,836 ft3 Volume provided 40,075 ft3 OK, volume provided is equal to or in excess of volume required. Storage Volume: SA Waters 1.5" runoff volume ft3 Pre -development 1-yr, 24-hr runoff ft3 Post -development 1-yr, 24-hr runoff ft3 Minimum volume required ft3 Volume provided ft3 Peak Flow Calculations Is the prelpost control of the 1yr 24hr storm peak flow required? Y (Y or N) 1-yr, 24-hr rainfall depth 3.8 in Rational C, pre -development 0.20 (unitiess) Rational C, post -development 0.60 (unitiess) Rainfall intensity: 1 -yr, 24-hrstorm 3.90 in/hr OK Pre -development 1-yr, 24-hr peak flow 6.68 ft3/sec Post -development 1-yr, 24-hr peak flow 20.04 ft3/sec Pre/Post 1-yr, 24-hr peak flow control 13.36 g3/sec Elevations Temporary pool elevation 26.00 fmsl Permanent pool elevation 23.50 fmsl SHWT elevation (approx. at the perm. pool elevation) 28.17 fmsl Top of 1Oft vegetated shelf elevation 24.00 fmsl Bottom of 10ft vegetated shelf elevation 23.00 fmsl Sediment cleanout, top elevation (bottom of pond) 12.50 fmsl Sediment cleanout, bottom elevation Sediment storage provided 11.50 fmsl �� � �� 1.00 ft is there additional volume stored above the state• -required temp. pool? N (Y or N) JAN Elevation of the top of the additional volume fmsl 16 2015 0 BY:- Fort SW401-Wet Detention Basin-Rev.9-4/18/12 Parts I. & H. Design Summary, Page 1 or 2 Permit No. (to be provided by N il. DESION INIF - J ION Surface Areas Area, temporary pool 18,193 fe Area REQUIRED, permanent pool 11,639 e SAIDA ratio 3.12 (unitless) Area PROVIDED, permanent pool, Ap._pw 12,563 fe OK Area, bottom of 1 Oft vegetated shelf, Aba-�b�if 10,355 fr Area, sediment deanout, top elevation (bottom of pond), AboLlmd 221 ftL Volumes Volume, temporary pool 40,075 fP OK Volume, permanent pool, Vperm_pw 50,497 le Volume, forebay (sum of forebays if more than one forebay) 10,311 fe Forebay % of permanent pool volume 20.4% % 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 3.12 (unitless) Average depth (used in SA/DA table): Calculation option 1 used? (See Figure 10-2b) N (Y or N) Volume, permanent pool, VamLpmi 50,497 ft Area provided, permanent pool, Apes p j 12,563 ft1 Average depth calculated ft Need 3 ft min. Average depth used in SAIDA, d. (Round to nearest 0.5ft) it Calculation option 2 used? (See Figure 10-2b) Y (Y or N) Area provided, permanent pool, Apwm_pw 12,563 fe Area, bottom of 1 Oft vegetated shelf, Ab.l dwr 10,355 e Area, sediment deanout, top elevation (bottom of pond), Abotl.d 221 f? "Depth" (distance b/w bottom of 1 Oft shelf and top of sediment) 10.50 ft Average depth calculated 5.82 It OK Average depth used in SAIDA, d., (Round to down to nearest 0.5ft) 6.0 it OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 2.00 in Area of orifice (if -non -circular) in Coefficient of discharge (CD) 0.60 (unitless) Driving head (Ho) 0.84 it Drawdown through weir? N (Y or N) Weir type (unitless) Coefficient of discharge (CW) (unitless) Length of weir (L) it Driving head (H) ft Pre -development 1-yr, 24-hr peak flow 6.68 fe/sec Post -development 1-yr, 24-hr peak flow 20.04 fe/sec Storage volume discharge rate (through discharge orifice or weir) 0.10 fe/sec Storage volume drawdown time 3.12 days OK, draws down in 2-5 days. Additional Information Vegetated side slopes 3 :1 OK Vegetated shelf slope 10 :1 OK Vegetated shelf below width Length of flowpath to 10.3 ft OK ^ E I V C width ratio 3 :1 OK �....�r G Length to width ratio 2.0 :1 OK Trash rack for overflow & orifice? Y (Y or N) OK JAN 16 2015 Freeboard provided 1 0 ft OK Vegetated filter provided? N (Y or N) OK Recorded drainage easement provided? Y (Y or N) OK BY. Capures all runoff at ultimate build -out? Y (Y or N) OK Drain mechanism for maintenance or emergencies is; pump Forth SW401-Wet Detention Basin-Rev.9-4118112 Parts r. A 11. Design Summary, Page 2 of 2 Permit No. (to be provided by DWQ) Bll. REQUIRED ITEMS CHECKLIST —� I Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the appiicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page/ Plan Initials Sheet No. i C3, C8 1. Plans (1" - 50' or larger) of the entire site showing: - Design at ultimate build -out, - Off -site drainage (if applicable), - Delineated drainage basins (include Rational C coeffirient per basin), - Basin dimensions, Pretreatment system, - High flow bypass system, - Maintenance access, Proposed drainage easement and public right of way (ROM, Overflow device, and Boundaries of drainage easement. 11r , I M W C3, C8 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing: - Outlet structure with trash rack or similar, - Maintenance access, - Permanent pool dimensions, - Forebay and main pond with hardened emergency spillway, - Basin cross-section, - Vegetation specification for planting shelf, and - Filter strip. C8 3. Section view of the wet detention basin (1" 20' or larger) showing: - Side slopes, 3:1 or lower, - Pretreatment and treatment areas, and - Inlet and outlet structures. C9 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified on the plans prior to use as a wet detention basin. attached 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. M W C9 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized, ���� taylLV) attached 7. The supporting calculations. tVILV attached 8. A copy of the signed and notarized operation and maintenance (OW) agreement. attached 9. A copy of the deed restrictions (if required). attached 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County soil maps are not an acceptable source of soils information. Form SW401-Wet Detention Basin-Rev.9-4/18/12 E:t.'E1V JAN 16 2015 BYITMIL Required Items Checklist, Page 1 of 1 Permit No�G (to be provided by DWQ) ATA o��pW ATF9A. STORMWATER MANAGEMENT PERMIT APPLICATION FORM � � NCDENR 401 CERTIFICATION APPLICATION FORM INFILTRATION 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 info►mation. L PROJECT INFORMATION — -� Project Name Village at Motts Landing Phase 28 Contact Person Phillip G. I npp, PE Phone Number 910-763-5100 Date 12/30/2014 Drainage Area Number 3 II. DESIGN INFORMATION Site Characteristics Drainage area 83,910.00 fe Impervious area 41,625.00 fe Percent impervious 49.61 % Design rainfall depth 1.50 in Peak Flow Calculations 1-yr, 24-hr rainfall depth 380 in 1-yr, 24-hr intensity 3.90 in/hr Pre -development 1-yr, 24-hr discharge 0.61 ft3/sec Post -development 1-yr, 24-hr discharge 4.14 —I,'/sec Pre/Post 1-yr, 24-hr peak flow control 3.53 —fe/sec Storage Volume: Non -SA Waters Minimum design volume required 5,21700 ft3 Design volume provided 18,231.00 ft3 OK for non -SA waters Storage Volume: SA Waters 1.5" runoff volume ft3 Pre -development 1-yr, 24-hr runoff volume fe Post -development 1-yr, 24-hr runoff volume ft3 Minimum required volume ft3 Volume provided ft3 Soils Report Summary Soil type sand Infiltration rate 540 in/hr SHWT elevation 22 92 fmsl Basin Design Parameters Drawdown time 0.40 days OK Basin side slopes :1 Basin bottom elevation 25.00 fmsl OK Storage elevation 28.00 fmsl Storaae Surface Area 18,231 00 e Top elevation 29.25 fmsl Basin Bottom Dimensions Basin length 130.00 ft E C E I V�/ E Basin width 45.00 ft Bottom Surface Area 6,077.00 fe JAN 16 2015 BY: Form SW401-Infiftration Basin-Rev.5 11Apr2o11 Parts I. & II. Design Summary, Page 1 of 2 Permit No. (to be provided by DWr) Additional Information Maximum runoff to each inlet to the basin? 2.00 ac-in OK Length of vegetative filter for overflow NIA ft OK Distance to structure 50+ ft OK Distance from surface waters 30+ ft OK Distance from water supply well(s) 100+ It OK Separation from impervious soil layer 208 ft OX Naturally occuring soil above shwt 2.08 ft OK Bottom covered with 4-in of clean sand? Y (Y or N) OK Proposed drainage easement provided? Y (Y or N) OK Oapu,cs al! runoff a, ultimate build -out' Y (Y or N) OK Bypass provided for larger storms? N/A (Y or N) OK Pretreatment device provided curb inlets RECE,VED JAN 16 2015 BY: Form SW401-Infiltration Basin-Rev.5 11Ap2011 Parts I, & II. Design Summary, Page 2 of 2 Permit No. (to be provided by DWQ) tit. REODU1RED ITEMS CHECKLIST Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page/ Plan Initials Sheet No. MQ/_ C4, C8 1. Plans (1" 50' or larger) of the entire site showing: - Design at ultimate build -out, - Off -site drainage (if applicable), - Delineated drainage basins (include Rational C coefficient per basin), - Basin dimensions, - Pretreatment system, - High flow bypass system, Maintenance access, - Proposed drainage easement and public right of way (ROW), - Overflow device, and Boundaries of drainage easement. C4, C8 2. Partial plan (1" = 30' or larger) and details for the infiltration basin showing: - Bypass structure, Maintenance access, Basin bottom dimensions, - Basin cross-section with benchmark for sediment cleanout, Flow distribution detail for inflow, Vegetated filter, and - Pretreatment device. 1B1UL C8 3. Section view of the infiltration basin (1" = 20' or larger) showing: - Pretreatment and treatment areas, and - Inlet and outlet structures. KA (_y attached 4. A table of elevations, areas, incremental volumes & accumulated volumes to verify the volume provided. ML attached 5. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the soils report must be verified in the field by DWQ, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. " �� , r wv C9 6. A construction sequence that shows how the infitlration basin will be protected from sediment until the entire drainage area is stabilized. —hI attached 7. The supporting calculations. --KU. attached 8. A copy of the signed and notarized operation and maintenance (0&M) agreement. _ attached 9. A copy of the deed restrictions (if required). ECEIVEj� JAN 16 2015 `I Y BY: Form SW401-Infiltration Basin-Rev.4 Page 1 of 1 Part III. Required Iterns Checklist, Page 1 of 1 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. Tire fullowing covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number SW8150113 , 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 built -upon area per lot; in square feet., is as listed below. - Lot # BUA 25 — 74 3,500 sf 87 — 92 3,500 sf 93 — 96 5, 000 sf 227 — 255 5, 000 sf 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 pennitted 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 swa/es 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. ECE1VF_ MAR 0 8 20133 Form DRPC-3 Rev.2 05Nov2009 Page 1 of 2 Hiah Density Residential Subdivisions Deed Restrictions & Protective Covenances Signature: 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 day of March , 2016 , and acknowledge the due execution of the foregoing instrument. Witness my hand and official seal, SEAL Signature a•��``:" My Commission expires 10/15/16 OTAJ�r a ^UI31.%C ECEiE:: MAR 0 8 201J BY: Form DRPC-3 Rev.2 05Nov2009 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 Stonmwater Management Permit Number SW8 150113 , as issued by the Division of Water Quality under the Stonmwater 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. 6. The maximum built -upon area per lot, in square feet, is as listed below. Lot # BUA 25 — 74 3,500 sf 87 — 92 3,500 sf 93 — 95 5, 000 sf 227 — 255 5, 000 sf 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. W,, -� x >` WAR 13 2013 BY, -.— --- - Form DRPC-3 Rev.2 05Nov2009 Page 1 of 2 Sig High Density Residential Subdivisions Deed Restrictions & Protective Covenances 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 day of --j&Qav-(4= , 2015 , and acknowledge the due execution of the foregoing instrument. Witness my hand and official seal, J SEAL Signature _-AU,I„ IIIORA _ My Commission expires 10/15/16 40P1 °''°- °°0.1 ft13UNG ECEIVE JAN 16 2015 Form DRPC-3 Rev.2 05Nov2009 Page 2 of 2 TE 14021 State Stormwater nagement Systems P rmit No. SW8 150113 The Village at Motts Landing Phase 2B — Wet Pond 1 Stormwater Project No. SW8 150113 New Hanover County Partial Engineer's Certification I, Phillip G. Tripp , as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, The Village at Motts Landing Phase 2B — Wet Pond 1 (Project) for Aftew Properties, LLC (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 specifications: * Partial Certification for Pond 1 only Signature Registration Number 17374 Date Q •7 ECE4V � RSEp 0 72a�i SEAL 40ee"tIIIIarrere0 C v 0.0 Q�N.. ...... o, SEAL 17,374 to �' Y s • ^t o o� Qa ti, /�/ • sass••• y aid l�GR r G6R° o��'a� State Stormwater Management -Systems Permit No. SW8 150116 �r-y J Certification Requirements: 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. * Houses to be constructed at a later date _4_5. The outlet/bypass structure elevations are per the approved plan. _A_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. * Vegetation being established A 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. * Vegetation being established 15. The required dimensions of the system are provided, per the approved plan. 16. All components of the stromwater BMP are located in either recorded common area, or recorded easements. The Village at Motts Landing Phase 28 — Wet Pond 2 Stormwater Project No. SW8 150113 New Hanover County Partial Engineer's Certification TE 14021 State Stormwater Management Systems Permit No. SW8 150113 V 9I MS ✓ 60-0 ve 1, Phillip G. Tripp , as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, The Village at Motts Landing Phase 2B —Wet Pond 2 (Project) for Aftew Properties LLC (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 specifications: * Partial Certification for Pond 2 only SEAL Signature Registration Number 17374 Date 1 • l {o • (Q State Stormwater Management Systems Permit No. SW8150116 Certification Requirements: Page 2 of 2 ✓& rI 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. * Houses to be constructed at a later date 5. The outlet/bypass structure elevations are per the approved plan. 96 The outlet structure is located per the approved plans. � 7. Trash rack is provided on the outlet/bypass structure. .el—_ 8. * All slopes are grassed with permanent vegetation. * Vegetation being established 4-9. 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 foreba and the vegetated filter. y' CA * Vegetation being established 15. The required dimensions of the system are provided, per the approved Ian. PP P 16. All components of the stromwater BMP are located in either recorded common area, or recorded easements. TE 14021 State Stormwater Management Systems Permit No. SW8 150113 The Village at Motts Larding Phase 2B — Pond 3 Stormwater Project No. SW8150113 New Hanover County Partial Engineer's Certification I, Phillip G, Tripp , as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodicaily/weekly/full time) the construction of the project, The. Village at Motts Landing Phase 2B Pond 3 (P roject) for Aftew Properties LLC (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 specifications:. * Partial Certification for Pond 3 only r Signature` Registration Number 17374 Date..•? E E =7 .ram _;j AIR ' 3 C.vs11 I' I SEAL State Stormwater Management Systems Permit No. SW8 150113 Certification Requirements (Infiltration Basin): 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. �tr 5, The outlet/bypass structure elevations are per the approved plan. N/A 6. The outlet structure is located per the approved plans. N/A 7. Trash rack is provided on the outlet/bypass structure. 4. ✓f 41 8. All slopes are grassed with permanent vegetation. 6 ` 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. N/A 12. Required drawdown devices are correctly sized per the approved plans. nk 13. All required design depths are provided. N/A 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.