Loading...
HomeMy WebLinkAboutSW8881104_Current Permit_20230522 ROY COOPER � e M c Governor ` E a ELIZABET"H S.BISER --- Secretary DOUGLAS R.ANSEL NORTH CAROLINA Interim Director 'Z,O Z 3 Environmental Quality May 22nci,201M Cedar Tree Property Owners Association Attn:Roxanne Brennan,President 90 Cedar Tree Lane SW Calabash,NC 28467 Subject: Permit Renewal Post-Construction Stormwater Management Permit No. SW8881104 Cedar Tree Subdivision Brunswick County Dear Ms.Brennan: Effective August 1,2013 the Post-Construction Stormwater Management 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 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 enforcement 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 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 Division of Energy,Mineral and Land Resources received a complete 8-year Permit Renewal Application for the subject permit on April 27,2023. The Division is hereby notifying you that permit SW8881104 has been renewed,updated, and re-issued on May 22,2023,as attached. As requested, a copy of the current operation and maintenance agreement is also enclosed. Please be aware that the renewal and re-issuance of this stormwater permit does not imply that the site is currently in compliance. This permit shall be effective until February 15,2030,which includes all available extensions,and does not supersede any other agency permit that may be required. The project shall be subject to the conditions and limitations as specified therein. This permit does not impose new or increased stormwater control requirements; it clarifies the rules and requirements of this program to provide you with a better understanding of your obligations under this permit. Failure to comply with these requirements will result in future compliance problems. Please note that this permit is not transferable except after notice to and approval by the Division. If any parts,requirements, or limitations contained in this permit are unacceptable,you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings(OAR). The written petition must conform to Chapter 150B of the North Carolina General Statutes and must be filed with the OAH within thirty(30)days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee(if a filing fee is required)and/or the details of the filing process at 6714 Mail Service Center, Raleigh,NC 27699-6714,or via telephone at 919-431-3000,or visit their website at www.NCOAH.com.Unless such demands are made this permit shall be final and binding. If you have any questions concerning this permit,please contact Aisia Freeman in the Wilmington Regional Office,at(910)796-7318 or.Aisia.freeman@ncdonr.gov. Sincerely, Cori i W Douglas R.Ansel,Interim Director Division of Energy,Mineral and Land Resources North Carolina Department of Environmental Quality I Division of Energy,Mineral and Land Resources �,DE Wilmington Regional Office 1127 Cardinal Drive Extension I Wilmington,North Carolina 28405 NORTH O ROUNA. i aoR tewei 910.796.7215 State Stormwater Permit No. SW8 881104 Page 2 of 2 Enclosures: Attachment A—Designer's Certification Form Attachment C—Permitting History Copy of the Renewal Application Documents Copy of the current operation and maintenance agreement DES/af: \\\Stormwater\Permits&Projects\1988\881104 HD\2023 05 permit 881104 cc: Wilmington Regional Office Stormwater File -0- D North Carolina Department of Environmental Quality I Division of Energy,Mineral and Land Resources Wilmington Regional ice 1127 Cardinal Drive Extension I Wilmington,North Carolina 28405 roans Beier �°p"°'"*°'d"�°^^m"�� 910.796.7215 Post Construction Stormwater Management Permit No. SW8881104 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL AND LAND RESOURCES POST-CONSTRUCTION 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 Cedar Tree Property Owners Association Cedar Tree Subdivision NCSR 1167 near US17 intersection, Calabash, Brunswick County FOR THE construction, operation and maintenance of one (1) wet detention pond in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred tc as the "stormwater rules") 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 February 15, 2030 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 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.6 of this permit. The subdivision is permitted for 64 lots, each allowed a maximum of 3,000 square feet of built-upon area. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 4. The runoff from all built-upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. 5. This pond must be operated with a 30' vegetated filter. Page 1 of 5 Post Construction Stormwater Management Permit No. SW8881104 6. The following design elements have been permitted for this wet detention pond stormwater facility, and must be provided in the system at all times. a. Drainage Area, acres: 18.48 Onsite, ft2: 804,989 Offsite, ft2: 0 b. Total Impervious Surfaces, ft2: 270,843 Lots at 3,000 ft2: 192,000 Roads/Parking, ft2: 71,438 Other, ft2: 7,405 Offsite, ft2: 0 c. Average Pond Depth, feet: 4.0 d. TSS removal efficiency: 85% e. Design Storm: 1 f. Permanent Pool Elevation, FMSL: 38.5 g. Permitted Surface Area @PP, ft2: 48,787 h. Permitted Storage Volume, ft3: 46,849 i. Storage Elevation, FMSL: 39.4 j. Controlling Orifice: 22.5°V-notch weir k. Permanent Pool Volume, ft3: N/A (1988 existing pond) I. Forebay Volume, ft3: N/A)1988 existing pond) m. Maximum Fountain Horsepower: N/A n. Receiving Stream / River Basin: UT Persimmon Swamp/ LBR57 o. Stream Index Number: 15-23-2-1 p. Classification of Water Body: "C Sw" II. SCHEDULE OF COMPLIANCE The permittee is responsible for verifying that the proposed built-upon area for the entire lot does not exceed the maximum allowed by this permit. Once the lot transfer is complete, the built-upon area may not be revised without approval from the Division, and responsibility for meeting the built-upon area limit is transferred to the individual property owner. 2. If an Architectural Review Board or Committee is required to review plans for compliance with the BUA limit, the plans reviewed must include all proposed built-upon area. Any approvals given by the Board do not relieve the homeowner of the responsibility to maintain compliance with the permitted BUA limit. 3. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. 4. 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. 5. 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. 6. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. Page 2 of 5 Post Construction Stormwater Management Permit No. SW8881104 7 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 project 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. Adding the option to use permeable pavement or#57 stone within the lots as a permeable surface. The request may require a proposed amendment to the deed restrictions and protective covenants for the subdivision to be submitted and recorded. g. 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. h. Other modifications as determined by the Director. 8. 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. 9. 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. 10. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 11 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. 12. 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. 13. The permittee shall at all times provide the operation and maintenance necessary to assure that all components of the permitted stormwater system function at 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 re-vegetation of side slopes. d. Immediate repair of eroded areas. e. Maintenance of side slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of structures, orifice, catch basins and piping. g. Access to all components of the system must be available at all times. 14. Records of maintenance activities must be kept and made available upon request to authorized personnel of the division. The records will indicate the date, activity, name of person performing the work and what actions were taken. Page 3 of 5 Post Construction Stormwater Management Permit No. SW8881104 15. 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. 16. Prior to the sale of any lot, the following deed restrictions must be recorded: a. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number SW8 881104, as issued by the Division 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. e. Alteration of the drainage as shown on the approved plans may not take place without the concurrence of the Division. f. The maximum built-upon area per lot is 3,000 square feet. This allotted amount includes any built-upon area constructed within the lot property boundaries, and that portion of the right-of-way between the front lot line and the edge of the pavement. Built upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. g. All runoff on the lot must drain into the permitted system. This may be accomplished through providing roof drain gutters, which drain to the street, grading the lot to drain toward the street, or grading perimeter swales and directing them into the pond or street. Lots that will naturally drain into the system are not required to provide these measures. 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. Prior to transfer of the permit, the stormwater facilities will be inspected by division personnel. The facility must be in compliance with all permit conditions. Any items not in compliance must be repaired or replaced to design condition prior to the transfer. Records of maintenance activities performed to date will be required. 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). 3. CHANGES TO THE PROJECT NAME, PERMITTEE NAME OR CONTACT INFORMATION. The permittee shall submit a completed Permit Information Update Application Form to the Division within 30 days to making any one of these changes. 4. 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 project 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. Page 4 of 5 Post Construction Stormwater Management Permit No. SW8881104 a. 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; ii. A partnership, limited liability corporation, corporation, or any other business association that has been dissolved; iii. 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, except in the case of an individual residential lot sale that is made subject to the recorded deed restrictions and protective covenants; v. The assignment of declarant rights to another individual or entity; vi. The sale or conveyance of the common areas to a Homeowner's or Property Owner's Association, subject to the requirements of NCGS 143-214.7(c2); b. 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 project and the on-site stormwater system complies with the permit conditions. Records of maintenance activities performed to date may be requested. Projects not in compliance with the permit will not be transferred until all permit and/or general statute conditions are met. 5. 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. ANNUAL CERTIFICATION. The permittee shall electronically submit to the Division an annual certification completed by either the permittee or their designee confirming the projects conformance with permit conditions e. 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. f. 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. Permit renewed, updated, and reissued this the 22nd day of May 2023. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION <31Z Douglas R. Ansel, Interim Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Page 5 of 5 Attachment C-Permitting History Cedar Tree Subdivision Permit No.SW8 881104 Approval Daw IMS Permit Action I Version� Description of the Changes I Modified Plan Sheets I Determination of Compliance with Stormwater Regulations-we have determined that 12/12/1988 Original 1.0 the project complies with the Stormwater Regulations set forth in Title 15 NCAC 1(of 1) Approval 2H.1003(g)(2). Ownership change-High Density Subdivision Project-construction,operation and 2/15/2008 Major 1 1 maintenance of one(1)wet detention pond in compliance with the provisions of 15A Cl 1(of 1) Modification NCAC 2H.1000.The subdivision is permitted for 64 lots,each allowed a maximum of 3,000 square feet of built-upon area. Name Change/Ownership Change-operation and maintenance of one wet detention 9/3/2010 Major 1 2 pond in compliance with the provisions of 15A NCAC 2H.1000 effective September Modification 1,1995.The subdivision is permitted for 64 lots,each allowed a maximum of 3,000 square feet of built-upon area. 5/22/2023 Renewal 2.0 This permit shall be effective until February 15,2030 Page 1 of 1 PEMLR USE ONLY Date Roceilmd Fee Paid Permit Numper ell(71 IF /1218" ,0 505--42) 57148' If 041 . NC DEQ Division of Energy, Mineral and Land Resources STATE STORIWATER: 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 period of 8 years per Session Law 2011-398(SB 781) Section 60.(c). This application form is for permit renewals only. A. PROJECT INFORMATION 1. State Stormwater Permit Number: SW8 881104 2. Project name: Cedar Tree Subdivision Stormwater Project No.SW8 881104 3. Project street address: 90 Cedar Tree Lane SW City: Calabash County: Brunswick ZIP: 28467 4. What, if any,changes have been made to the project as permitted? None 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:httos://dea.nc.gov/about/divisions/energv- mineral-land-resources/energy-mineral-land-rules/sormwater-program/Dost-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://deq.nc.gov/about/divisions/enerqv-mineral-land- resources/enerov-mineral-land-rules/sormwater-orogram/Dost-construction. State Stormwater Permits do not automatically transfer with the sale of the property. 1. Current Permit Holder's Company Name/Organization: Bill Grothe&Cedar Tree Property Owners Association 2. Signing Official's Name: Roxanne Brennan-Cedar Tree Property Owners Association 3. Signing Official's Title: President 4. Mailing Address: 90 Cedar Tree Lane SW City: Calabash State: NC ZIP: 28467 5. Street Address: Same as above City: State: ZIP: 6. Phone: (845 ) 707-9948 Email: Roxbrennan2016@gmail.com ECEIWEER lir APR 272023 Li 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: X 1. A permit application processing fee of$505.00 payable to NCDEQ. X 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. X 3. One hard copy and one electronic copy of recorded documents required by the original permit that have not yet been received by DEMLR, including:deed restrictions, protective covenants, 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, X **Please see attached images and lot analysis-Appendix 1. 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. **We have copies, however we are requesting copies to ensure we have the same copies on hand. 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. NA 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. X 7. [IF APPLICABLE]When the permittee 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/bv title/ Business Registration RECEIVE APR 22' 2023 BY: D. PERMITTEE'S CERTIFICATION 1, Roxanne Brennan ,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,corre nd complete. QQ,,�� Signature' Abili Date: P7 3 NOTARIZATION: I, RIRN,li . W (litt V)S ,a Notary Public for the State of 0 rt k CcurOt t i lA ,County of 3U`C/ Sw.e.A. :.E ,do hereby certify that RaXFtJ►ve, terc,vuouA tN personally appeared before me thi tl 11111rgr,,i/.'-1 day of Apr, I ,20,2 3 ,and acknowledge the due =.;, ehu ion o/ J oing instrument.Witness my hand and official seal, Ei cc(No� i�0Seltll o. = , = 30,....1 -. .C1 q ;$' - �� My commission expires ,A-f -.A I GCEI V E APR 272023 BY: Permit No. 560 Ye f/O 4 (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 DWQ Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. I. PROJECT INFORMATION Project Name: Ceder free ee cSubc I.vi 5 Contact Person: 6a tk Ti kOirth Phone Number: (7041 59'7 -R7Z2 For projects with multiple basins,specify which basin this worksheet applies to: elevations Basin Bottom Elevation 34.2 ft. (floor of the basin) Permanent Pool Elevation 3 5,2 ft. (elevation of the orifice) Temporary Pool Elevation .3 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 32(p'70 sq. ft. (water surface area at the orifice elevation) Drainage Area I&. 45 ac. (on-site and off-site drainage to the basin) Impervious Area 6.a 8 ac. (on site and off-site drainage to the basin) volumes Permanent Pool Volume N l� cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 34,©O cu. ft. (volume detained above the permanent pool) Forebay Volume 1J f A. cu. ft. (approximately 20%of total volume) Other parameters SA/DA1 2• I 10 (surface area to drainage area ratio from DWQ table) Diameter of Orifice Z.V2° V- tiPair (2 to 5 day temporary pool draw-down required) Design Rainfall 1 in. Design TSS Removal 2 5 5 % (minimum 85%required) Form SWU-102 Rev 3.99 Page of 4 Footnotes: I 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 In the 20 coastal counties,the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90%TSS removal. The NCDENR BMP manual provides design tables for both 85%TSS removal and 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, February 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 ,✓ a. The permanent pool depth is between 3 and 6 feet(required minimum of 3 feet). tJ I A. b. The forebay volume is approximately equal to 20% of the basin volume. c. The temporary pool controls runoff from the design storm event. ✓ 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 calculations) �✓ f. The basin length to width ratio is greater than 3:1. ✓g. The basin side slopes above the permanent pool are no steeper than 3:1. j,k h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less(show detail). i. Vegetative cover above the permanent pool elevation is specified. z✓ j. A trash rack or similar device is provided for both the overflow and orifice. ✓ k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. Pik 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as 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 0 does not incorporate a vegetated filter at the outlet. This system(check one) 0 does j► •oes not incorporate pretreatment other than a forebay. Form SWU-IO2 Rev 3.99 Page 2 of 4 ..c..ecur Tfee_ obetiq i5i oil LSrunsu 'G1( (aun- S(,Jg `c $110 ii y Maintenance activities shall be performed as follows: 1. After every significant runoff producing rainfall event and at least monthly: a. 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, mow 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. 4. 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 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads JV/A feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) v tibA' Permanent Pool Elevation Sediment Re oval El. 75 ---- - - Sediment Removal Elevation ;75% Bottom Ele a' % Bottom Elevation 25% FOREBAY MAIN POND 5. 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 forebay berm. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-102 Rev 3.99 Page 3 of 4 7. All components of the wet detention basin system shall be maintained in good working order. f , 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: Gordon N. Titcomb Title: President -- Can--Am Development Corporation Address: 6401 Orr Road Charlotte, NC 28213 Phone: (704) 597-9722 Signature: Date: S`7 2.\OS 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, , a Notary Public for the State of N County of , do hereby certify that ` .i . personally appeared before me this aeudt.day of , , and acknowledge the due execution of the forgoing wet detention basin maintenance re irements. Witness my hand and official seal, SEAL My commission expires 31) aoe94 Form SWU-102 Rev 3.99 Page 4 of 4 ® .......... CRISER & TROUTMAN CONSULTING ENGINEERS 11 ritRagAr-..rf---,: ov"ktuvN t r::; :4 .c , !?:: - . , 't. .. za,92 : : ..,0 \vmoi _.; , . Celebrating October 01, 2002 ' •• Fifty Years Division of Water Quality NC DENR 127 Cardinal Drive Extension Wilmington,NC 28405-3845 Re: Permit No. SW8 881104 Cedar Tree Subdivision Brunswick County Noelle, This is to certify to the best of our knowledge and belief; based on a final inspection, the contractor has completed the storm water system additions for the above captioned project in accordance with the intent and meaning of the construction documents. The owner will install sod in the bottom of the swale for a minimum of 30 linear feet. The flap gate has been installed and the existing outlet pipe has had a section removed. Sincerely yours, it‘ 6 II w Donald R. Butler, P.E. N. C. Registration No. 8948 .,t•°-\%H Cafo''% SEAL .....•.° 1/ o� r0- 8E /. L, 7s • 8948 r° 0 i d 466.-- P.O. Box 3727 • 3809 PEACHTREE AVENUE, SUITE 102 • WILMINGTON, N.C. 28406 • (910) 397-2929 • FAX 397-2971