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HomeMy WebLinkAboutSW8060702_CURRENT PERMIT_20211110STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO SW8 ouo-102 DOC TYPE] CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE 2-0 21 11 10 YYYYMMDD ROY COOPER covanor ELIZABETH S BISER S—tory BRUIN WRENN Dlrecto November 10 2021 NORTH CAROLINA EnHronmenud Qual ty Birdsey Napier Investment Group LLC Attn Rosalind N Fuller Trustee Member 321 N Front Street Wilmington, NC 28401 Subject, Permit Renewal State Stormwater Management Permit No SW8 060702 Lot 6 Island Park New Hanover County Dear Ms Fuller - Effective August 1 2013 the State Stormwater program has been transferred from the Division of Water Quality (DWQ) to the Division of Energy Mineral and Land Resources (DEMLR) All previous references to DWQ will remain in older stormwater permits issued prior to August 1 2013 until they are modified_ Please note that this permit will now reference DEMLR as the Division responsible for issuance of the permit On August 5 2009 the Governor signed Session Law 2009-406 This law impacted any development approval issued by the former Division of Water Quality under Article 21 of Chapter 143 of the General Statutes which was current and valid at any point between January 1 2008 and December 31 2010 The law extended the effective period of any stormwater permit that was set to expire during this time frame to three (3) years from its current expiration date On August 2 2010 the Governor signed Session Law 2010 177 which granted an extra year for a total of four (4) years extension The Wilmington Regional Office received a complete 8 year Stormwater Management Permit Renewal Application for the subject project on November 9 2021 The Division is hereby notifying you that permit SW8 060702 has been renewed on November 10 2021 and shall be effective until July 7 2028 which includes all available extensions For your records please find enclosed a renewed, updated, and re issued permit and a copy of the renewal application Please keep this permit on file at all times Please note that the renewed, updated, and re issued permit does not impose new or different terms it merely restates some of the previous terms to provide you with a better understanding of your obligations under the permit The renewal and reissuance of this stormwater permit does not imply that the site is currently in compliance with the terms and conditions of this state stormwater permit The plans originally approved on July 7 2006 and most recently revised on February 11 2008 will remain in full force and effect in accordance with the regulations set forth in Title 15A NCAC 2H 1000 a This permit is 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 BMP(s) recordation of deed restrictions procedures for changes of ownership transferring the permit, and renewing the permit Failure to establish an adequate system for operation and maintenance of the stormwater management system, to record deed restrictions to transfer the permit, or to renew the permit, will result in future compliance problems If any parts requirements or limitations contained in this permit are unacceptable you have the sight to request an adjudicatory hearing by filing a written petition with the Office of Administrative Heanngs (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 Mall 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 D_E Q, North Carolina Departm M of Environmental Quality I Dmsron of En r9y Mneril and land Resources Whrungton Regional Office 1 127 Cardinal D I Extension I W'hrongton, North Ca of na 28405 9107%7215 r State Stormwater Permit No SW8 060702 Page 2 of 2 If you have any questions need additional copies of the permit or approved plans please contact Ashley Smith in the Wilmington Regional Office at (910) 796-7215 or ashleym smith@ncdenr gov Sincerely Ck-' 40 = Brian Wrenn, Director Division of Energy Mmeral and Land Resources Enclosures Attachment A — Designer s Certification Form Attachment C — Permitting Mstory Renewal Application Documents DES/ams OStormwaterTermits & Projects12006\060702 HD\2021 11 permit 060702 cc Amy S Norns, PE Norris & Tunstall, Consulting Engineers P C 2602 Iron Gate Drive State 102 Wilmington, NC 28412 NCDEQ-DEMLR Wilmington Regional Office D_EQZ� o��rserr�oop\ /� North Carob a Department of En"m me tal Q al ty I Dt r t of Energy Mineral and Land Resources Wilmington Regional Office 1127 Cardinal Drive Extensio I Wimmgt n North Carolina 28405 9107%7215 State Stormwater Management Systems Permit No SW8 060702 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY MINERAL AND LAND RESOURCES STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143 General Statutes of North Carolina as amended and other applicable Laws Rules and Regulations PERMISSION IS HEREBY GRANTED TO Birdsey Napier Investment Group LLC Lot 6 Island Park Barbados Boulevard New Hanover County FOR THE construction operation and maintenance of a wet detention pond in compliance with the provisions of 15A NCAC 2H 1000 (hereafter referred to as the stormwaterrules ) and as outlined in the application approved stormwater management plans supplement calculations operation and maintenance agreement recorded documents specifications and other supporting data (the approved plans and specifications ) as attached and/or on file with and approved by the Division of Energy Mineral and Land Resources (the Division or DEMLR ) The project shall be constructed operated and maintained in accordance with these approved plans and specifications The approved plans and specifications are incorporated by reference and are enforceable part of this permit This permit shall be effective from the date of issuance until July 7 2028 and shall be subject to the following specified conditions and limitations The permit issued shall continue in force and effect until the permittee files a request with the Division for a permit modification transfer renewal or rescission however these actions do not stay any condition 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 for cause as allowed by the laws rules and regulations contained in Title 15A NCAC 2H 1000 and NCGS 143 215 1 et al 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 This stormwater system has been approved for the management of stormwater runoff as described in Section 16 on page 2 of this permit The stormwater control has been designed to handle the runoff from 142 441 square feet of impervious area The tract will be limited to the amount of built upon area indicated on page 2 of this permit and per approved plans The built upon area for the future development is limited to 56 512 square feet which is included in the total permitted impervious area of 142 441 square feet 4 All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements The final plats for the project will be recorded showing all such required easements in accordance with the approved plans 5 The runoff from all built upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system Page 1 of 7 State Stormwater Management Systems Permit No SW8 060702 6 The following design criteria have been provided in the wet detention pond and must be maintained at design conditions a Drainage Area acres Onsite ft2 Offsde ft2 b Total Impervious Surfaces ft2 OS Buildings ft2 OS Parking/roadways ft2 OS Sidewalks ft2 Future Buildout @ 90% ft2 c Design Storm inches d Pond Depth feet e TSS removal efficiency f Permanent Pool Elevation FMSL g Permanent Pool Surface Area ft2 h Permitted Storage Volume ft3 i Temporary Storage Elevation FMSL 1 Controlling Orifice k Permitted Forebay Volume ft3 I Receiving Stream/River Basin m Stream Index Number n Classification of Water Body II SCHEDULE OF COMPLIANCE 4 444 193 406 None 142 441 34 000 49 839 2090 56 512 10 40 90% 260 27 052 11 997 268 1 5 0 pipe 16 091 UT Prince George Creek / Cape Fear 187453 C Sw 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 Dunng construction erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at the design condition The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including but not limited to a Semiannual scheduled inspections (every 6 months) b Sediment removal c Mowing and revegetation of slopes and the vegetated filter d Immediate repair of eroded areas e Maintenance of all slopes in accordance with approved plans and specifications f Debris removal and unclogging of outlet structure orifice device flow spreader catch basins and piping g Access to the outlet structure must be available at all times Records of maintenance activities must be kept and made available upon request to authorized personnel of DEMLR The records will indicate the date activity name of person performing the work and what actions were taken Decorative spray fountains are allowed in the pond subject to the following criteria a The minimum permanent pool volume is 30 000 cubic feet b The fountain must draw its water from less than 2 below the permanent pool surface c 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 d The fountain may not be placed into the forebay e The falling water from the fountain must be centered in the main pond away from the shoreline f The maximum horsepower for a fountain in this pond is 1/3 horsepower Page 2 of 7 State Stormwater Management Systems Permit No SWS 060702 6 The facilities shall be constructed operated and maintained in accordance with the provisions of this permit the approved plans and specifications and the supporting documents attached to this permit and on file with the Division 7 Upon completion of construction prior to issuance of a Certificate of Occupancy and prior to operation of this permitted facility a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit the approved plans and specifications and other supporting documentation Any deviations from the approved plans and specifications must be noted on the Certification A modification may be required for those deviations 8 If the stormwater system was used as an Erosion Control device it must be restored to design condition prior to operation as a stormwater treatment device and prior to occupancy of the facility 9 Access to the stormwater facilities shall be maintained via appropriate easements at all times 10 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 11 No person or entity including the permittee shall alter any component shown in the approved plans and specifications Prior to the construction of any modification to the approved plans the permittee shall submit to the Director and shall have received approval for modified plans specifications and calculations including but not limited to those listed below For changes to the protect or SCM that impact the certifications a new or updated certification(s) as applicable will be required and a copy must be submitted to the appropriate DEQ regional office upon completion of the modification a Any modification to the approved plans and specifications regardless of size including the SCM(s) BUA details etc b Redesign or addition to the approved amount of BUA or to the drainage area c Further development subdivision acquisition lease or sale of any all or part of the project and/or property area as reported in the approved plans and specifications d Altering modifying removing relocating redirecting regrading or resizing of any component of the approved SCM(s) the stormwater collection system and/or vegetative conveyance shown on the approved plan e The construction of any allocated future BUA f The construction of any permeable pavement #57 stone area public trails or landscaping material to be considered a permeable surface that were not included in the approved plans and specifications g Other modifications as determined by the Director 12 ANNUAL CERTIFICATION The permittee shall electronically submit to the Division an annual certification completed by either the permittee or their designee confirming the protects conformance with permit conditions III GENERAL CONDITIONS 1 CORRECTIVE ACTIONS REQUIRED If the facilities fail to perform satisfactorily the permittee shall take immediate corrective actions This includes actions required by this Division and the stormwater rules such as the construction of additional or replacement on site stormwater systems These additional or replacement measures shall receive a permit from the Division prior to construction 2 PERMIT RENEWAL A permit renewal request must be submitted at least 180 days prior to the expiration date of this permit The renewal request must include the appropriate application documentation and the processing fee as outlined in Title 15A NCAC 02H 1045(3) Page 3 of 7 State Stormwater Management Systems Permit No SW8 060702 CURRENT PERM ITTEE NAME OR ADDRESS CHANGES The permittee shall submit a completed Permit Information Update Application Form to the Division within 30 days to making any one or more of the following changes A name change of the current permittee A name change of the project A mailing address change of the permittee TRANSFER This permit is not transferable to any person or entity except after notice to and approval by the Director Neither the sale of the protect and/or property in whole or in part nor the conveyance of common area to a third party constitutes an approved transfer of the permit TRANSFER REQUEST The transfer request must include the appropriate application documentation and the processing fee as outlined in 15A NCAC 02H 1045(2) This request must be submitted within 90 days of the permit holder meeting one or more of the following i A natural person who is deceased u A partnership limited liability corporation corporation or any other business association that has been dissolved ni A person or entity who has been lawfully and finally divested of title to the property on which the permitted activity is occurring or will occur through foreclosure bankruptcy or other legal proceeding IV A person or entity who has sold the property in whole or in part on which the permitted activity is occurring or will occur TRANSFER INSPECTION Prior to transfer of the permit a file review and site inspection will be conducted by Division personnel to ensure the permit conditions have been met and that the protect and the on site stormwater system complies with the permit conditions Records of maintenance activities performed to date may be requested Protects not in compliance with the permit will not be transferred until all permit and/or general statute conditions are met Page 4 of 7 State Stormwater Management Systems Permit No SW8 060702 COMPLIANCE The permittee is responsible for compliance with the terms and conditions of this permit until the Division approves the transfer request a APPROVED PLANS AND SPECIFICATIONS A copy of this permit approved plans application supplement operation and maintenance agreement all applicable recorded documents and specifications shall be maintained on file by the permittee at all times b DIVISION ACCESS The permittee grants Division Staff permission to enter the property during normal business hours to inspect all components of the permitted project c ENFORCEMENT 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 NCGS 143 Article 21 d OBTAINING COMPLIANCE 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 modified plans and certification in writing to the Director that the changes have been made e OTHER PERMITS The issuance of this permit does not preclude the permittee from complying with and obtaining any other permits or approvals that are required for this development to take place as required by any statutes rules regulations or ordinances which may be imposed by any other Local State or Federal government agency having jurisdiction Any activities undertaken at this site that cause a water quality violation or undertaken prior to receipt of the necessary permits or approvals to do so are considered violations of NCGS 143 215 1 and subject to enforcement procedures pursuant to NCGS 143 215 6 6 Unless specified elsewhere permanent seeding requirements for the on site stormwater system must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual Permit renewed updated and reissued this the 10th day of November 2021 NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION (� ?A �flanWrenn UireC or Division of Energy Mineral and Land Resources By Authority of the Environmental Management Commission Page 5 of 7 State Stormwater Management Systems Permit No SW8 060702 Lot 6 Island Park Stormwater Permit No SW8 060702 New Hanover County Attachment A Designers 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 protect (Protect) for (Protect Owner) hereby state that to the best of my abilities due care and diligence was used in the observation of the protect construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications The checklist of items on page 2 of this form is included in the Certification Noted deviations from approved plans and specification Signature Registration Number Date SEAL Page 6 of 7 State Stormwater Management Systems Permit No SW8 060702 Certification Requirements 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 and a forebay 15 The required system dimensions are provided per the approved plans cc NCDEQ DEMLR Wilmington Regional Office New Hanover County Building Inspections Page 7 of 7 Attachment C Permitting History Lot 6 Island Park Permit No SW8 060702 Approval Date Permit Action BfMS Version Description of the Changes 7/7/2006 Original Approval 10 The revisions include the construction of 45 086 ftz of built upon area for Phase II A total of 2/11/2008 Plan Revision 1 1 101 598 ftz of Future development BUA was accounted for under the July 7 2006 permit The amount of Future BUA remaining after the construction of Phase II is 56 512 ft 11/10/2021 Renewal 20 UtMLK Ubt UNLY Date Received Fee Paid Permit Number STATE STORMWATER PERMIT INFORMATION UPDATE APPLICATION FORM There is NO FEE for updating project name or permittee information This form is to only to be used by the current permittee to notify the Division of 1) changes to the Point of Contact (signing official) for the current permittee (LLC Corporation HOA or POA) 2) changes to the mailing address phone number or email address of the current permittee 3) changes to the name of the project and 4) changes to the legal corporate name as documented by a Name Change or Merger filed with the NCSOS N7 :Wa-iI91 A NEW PERMIT INFORMATION State Stormwater Permit Number SW8 060702 Are you updating (check all that apply) If so please provide the updated information ❑ Protect name ® Corporation Name' Birdsev Napier Investment Group. LLC ❑ Permit Contact Namez 3 ❑ Permit Contact Title ® Mailing Address3 321 N Front Street Wilmington, NC 28401 ❑ Phone number ® Email address wbfullenr(a)gmail corn Provide documentation such as a Name Change / Merger filed with the NCSOS Provide supporting documentation such as NCSOS filing The permit contacts position must be in accordance with 15A NCAC 02H 10400) If more than one point of contact or mailing address is being changed please attach a separate sheet B CERTIFICATION OF PERMITTEE I Rosalind N Fuller the current permittee hereby notify DEMLR that I am making the changes as listed in Section A above I further attest that this application for an update to the permit information currently on file is acc rate and c pI Ae to the best of my knowledge 1 Signature 1 Date I r a Notary Public for the State of County of do hereby certify that 16 1 1(� IV �I eiV persq,alipepp�ared before me this the day of IU LWQ MY Prr 20 and acknowledge the due �> ti�cVtDkNpoing instrument Witness my hand and official seal f�rx rA y er�7a .yam. r yp . t M 0 V hL NOV 0 9 2021 BY_ Stormwater Permit Information Update Form Page 1 of 1 May 11 2017 m n1��.I�a�611�IJ IG Date a eived Fee Paid Permit Number I 1 it- 1 Y3� 3505 i SCE$ 0 1,� 070 NC DEQ Division of Energy Mineral and Land Resources STATE STORMWATER PERMIT RENEWAL APPLICATION FORM In accordance with 15A NCAC 2H 1045(3) the current permit holder shall renew their high density permit 180 days prior to its expiration Renewed permits are valid for a penod of 8 years per Session Law 2011 398 (SB 781) Section 60 (c) This application form is for permit renewals only N1-1 4 J, 1 r-/,/f A PROJECT INFORMATION 1 State Stormwater Permit Number SW8 060702 2 Project name Lot 6 Island Park 3 Project street address Barbados Boulevard City Castle Havne County New Hanover ZIP 28429 4 What if any changes have been made to the project as permitted? If the project has changed from the original approved plans please complete SWU 101 for a Major Modification or Minor Modification Application form available at https //deg nc gov/about/divisions/energy mineral land resources/energy mineral land rules/stormwater program/post construction B PERMITTEE INFORMATION If changes to the permittee or project name have been made please complete either the Permit Update form or the Permit Transfer form available at https //deg ncgov/about/divisions/energv mineral land resources/energv mineral land rules/stormwater program/post construction State Stormwater Permits do not automatically transfer with the sale of the property 1 Current Permit Holders Company Name/Organization Birdsey Napier Investment Group, LLC 2 Signing Officials Name Rosalind N Fuller. Trustee 3 Signing Officials Title Member 4 Mailing Address 321 N Front Street City Wilmington 5 Street Address Same as Above City State 6 Phone (910) 763 0380 Email wbfullerir(dgmail corn NC ZIP 28401 ZIP ACZ11Zg �C NOV 09 2021 ey Stormwater Permit Renewal Form Page 1 of 3 May 11 2018 C SUBMITTAL REQUIREMENTS Submit the application package to the appropriate DEMLR Regional Office (Coastal SA Waters) or DEMLR Central Office (Urbanizing Areas Ph 2 USMP Non Coastal HQW/ORW) Only applications packages that include all required items listed below will be accepted and reviewed Initial each item below to indicate that the required information is provided in the application package 1 A permit application processing fee of $505 00 payable to NCDEQ 2 One original signed hard copy and one electronic copy of this completed form The signing official named on this application to represent the current permittee must meet one of the following a Corporation — a principle executive officer of at least the level of vice president b Limited Liability Company (LLC) — a manager or company official as those terms are defined in G S 57D North Carolina Limited Liability Company Act c Public Entity — a principal executive officer ranking official or other duly authorized employee d Partnership or limited partnership — the general partner e Sole proprietor or f Letter of authorization signed by one of the signatories noted in a — e above authorizing the signature of another entity 3 One hard copy and one electronic copy of recorded documents required by the original permit that c',L,_- have not yet been received by DEMLR including deed restrictions protective covenants `lUlll condominium/planned community declaration and easements If the project has been built include documentation that the maximum BUA per lot or maximum total BUA has not been exceeded If the project has not been built include a signed agreement that the final recorded deed restrictions and protective covenants will be submitted at a later date 4 O&M Agreements Please select one ® I have a copy of the current recorded O&M Agreement for all SCMs and I will continue to keep this on file with the permit or ❑ I do not have a copy of the current recorded O&M Agreement for all SCMs and am requesting a copy be sent to me I agree to keep this on file with the permit 5 Designer Certifications Please select one ® A copy of the certification(s) confirming that the project was built in accordance with the approved plans have been previously provided to the Division or ❑ A copy of the certification(s) confirming that the project was built in accordance with the approved plans are enclosed or ❑ The project has not yet been built N/A 6 [IF APPLICABLE] If the project has been built one original hard copy and one electronic copy of a signed sealed and dated letter from a licensed professional stating that the SCMs have been inspected and that they have been built and maintained in accordance with the permit 7 [IF APPLICABLE] When the permtttee is a corporation or a limited liability corporation (LLC) Provide one hard copy and one electronic copy of documentation from the NC Secretary of State or other official documentation which supports the titles and positions held by the persons listed in Section C 2 per 15A NCAC 2H 1043(3)(b) https //www sosnc gov/online services/search/by title/ Business Registration NOV 0 9 2021 BY_ Stormwater Permit Renewal Application Form Page 2 of 3 May 11 2018 D PERMITTEE S CERTIFICATION I Rosalind N Fuller the person legally responsible for the permit certify that I have a copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site) that I am responsible for the performance of the maintenance procedures and the site has been and will be maintained according to the O&M Agreement and approved plans I agree to notify DEMLR of any problems with the SCMs or built upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the project SCMs or ownership All information provided on this permit renewal application is to the best of my knowledge correct and comDlete. fk Sign that _ this the Y 0 County of day of KUYQW\hV/r forgoing instrument Witness my hand and official seal Date a Notary Public for the State of do hereby certify personally appeared before me and acknowledge the due �=�Cp cry CLt NOV 0 9 202, By_ Stormwater Permit Renewal Application Form Page 3 of 3 May 11 2018 Permit No SW8 000-7 D2 (to be provided by DWQ State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review A complete stormwater management plan submittal includes a wet detention basin supplement for each basin design calculations plans and specifications showing all basin and outlet structure details and a fully executed operation and maintenance agreement I PROJECT INFORMATION (please complete the following information) Project Name Lot 6 Island Park Contact Person Tim Clinkscales PE Phone Number For project with multiple basins specify which basin this worksheet applies to Elevations Basin Bottom Elevation 2200 ft (floor of the basin) Permanent Pool Elevation 2600 It (elevation of the orifice) Temporary Pool Elevation Area Permanent Pool Surface Area Drainage Area 1) Impervious Area Volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DAi Diameter of Orifice Design Rainfall Design TSS Removal Z 2680 ft 27 052 sq ft ac 327 ac 83 310 cu ft 11 997 cu ft 16 091 cu ft 635 150 in 10 in 90 % (910) 791 6707 DR"I (elevation of the discharge structure overflow) (water surface area at the orifice elevation) (on site and off site drainage to the basin) (on we and off site drainage to the basin) (combined volume of main basin and forebay) (volume detained above the permanent pool) (approximately 20% of total volume) (surface area to drainage area ratio from DWQ table) (2 to S day temporary pool draw down required) (minimum 85% required) Form SWU 102 Rev 3 99 Page 1 of Footnotes 1 When using the Division SA/DA tables the correct SA/DA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth Linear interpolation should be employed to determine the correct value for non standard table entries 2 The requirement for a vegetative filter may be waived if the wet detention basin is designed to meet 90 / TSS removal II REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N C Department of Environment Health and Natural Resources November 1999) and Administrative Code Section 15 A NCAC 2H 1008 Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached If the applicant has designated an agent in the Stormwater Management Permit Application Form the agent may initial below If a requirement has not been met, attach justification Applicants Initials 7G` a The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet) rGL b The forebay volume is approximately equal to 20% of the basin volume c The temporary pool controls runoff from the design storm event �G d The temporary pool draws down in 2 to 5 days e If required a 30 foot vegetative filter is provided at the outlet (include non erosive flow 766-- calculations) -(Z;e-' f The basin length to width ratio is greater than 3 1 ,TLC g The basin side slopes above the permanent pool are no steeper than 3 1 I- It A submerged and vegetated perimeter shelf with a slope of 6 1 or less (show detail) 16C i Vegetative cover above the permanent pool elevation is specified T� I A trash rack or similar device is provided for both the overflow and orifice �C k A recorded drainage easement is provided for each basin including access to nearest right of way I If the basin is used for sediment and erosion control during construction clean out of the basin is specified prior to use a wet detention basin m A mechanism is specified which will drain the basin for maintenance or an emergency III WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT 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 Form S WU 102 Rev 3 99 Page 2 of 4 Maintenance activities shall be performed as follows 1 After every significant runoff producing rainfall event and at least monthly Inspect the wet detention basin system for sediment accumulation erosion trash accumulation vegetated cover and general condition b Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed 2 Repair eroded areas immediately re seed as necessary to maintain good vegetative cover now vegetative cover to maintain a maximum height of six inches and remove trash as needed 3 Inspect and repair the collection system (i e catch basins piping swales riprap etc ) quarterly to maintain proper functioning Remove accumulated sediment from the wet detention basin system semi annually or when depth is reduced to 75% of the original design depth (see diagram below) Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i e stockpiling near a wet detention basin or stream etc ) 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 0 feet in the main pond the sediment shall be removed 30 When the permanent pool depth Treads -feet in the fore bay the sediment shall be removed r MCC BASIN DIAGRAM 7 (f11 d h1a k) Sediment p0���ob Permanent Pool Elevation 2600 ry')40o see f300�\ 23.c0 Sediment Removal Elevation _u, 30 Bottom Elevation\ 22 00 FOREBAY Bottom Elevation MAIN POND 2200 1 0 Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface These plants shall be encouraged to grow along the vegetated shelf and fore bay berm If the basin must be drained for an emergency or to perform maintenance the flushing of sediment through the emergency dram shall be minimized to the maximum extent practical 7 All components of the wet detention basin system shall be maintained in good working order Form SWU 102 Rev 3 99 Page 3 of 4 I acknowledge and agree by my signature below that I am responsible for the performance of the seven 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 Print name Rosalind N Fuller Title Address 106 Martingale Lane, Wilmington, NC 28405 Phone Signal Date 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 Liw q I N (I e kfa h S a Notary Public for the State of NO 't'rt & r"DI ll na— County of 1 �4W NOLnO V e/!' do hereby certify that R0 sa �l V hG- l Fa l personally appeared before me this 154 day of S 2006 and acknowledge the due execution of the foregoing wet detention basin maintenance requirements Witness my hand and official seal 0 WEI! My commission expires l "! IW2c H o20 d,00 7 6vda N. U" names Form SWU 102 Rev 3 99 Page 4 of 4