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HomeMy WebLinkAboutSW8070925_CURRENT PERMIT_20210527STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 CTJ OC125 DOC TYPE CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE 202\OSI-) YYYYMMDD ROY COOPER Governor DIONNE DELLFGATTI Sermury BRIAN WRENN Director May 27, 2021 Marine Corps Base Camp Lejeune Attn: Neal Paul, Deputy Public Works Officer 1005 Michael Road Camp Lejeune, NC 28547 NORTH CAROLINA Envvwtmentat Quality Subject: Permit Renewal State Stormwater Management Permit No. SW8 070925 P-671 Aircraft Fire Rescue Facility Onslow County Dear Mr. Paul: 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. The Wilmington Regional Office received a complete 8 year Stormwater Management Permit Renewal Application for the subject project on May 17, 2021. The Division is hereby notifying you that permit SW8 070925 has been renewed on May 27, 2021, and shall be effective until October 10, 2029,. 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 terns; 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 October 10, 2007 will remain in full force and effect in accordance with the regulations set forth in Title 15A NCAC 2H.1000. 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 right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150E of the North Carolina General Statutes, and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. If you have any questions, need additional copies of the permit or approved plans, please contact Ashley Smith in the Wilmington Regional Office, at (910) 796-7215 or ashleym.smith@ncdenr.gov. Sincerely, C �U�� Brian Wrenn, Director Division of Energy, Mineral and Land Resources ® North Carolina Department of Environmental Quality I Division of Energy. Mineral and Land Resources Wilmington Regional Office 1 127 Cardinal Drive Extension I Wilmington. North Carolina 2a405 910.796.7215 State Stormwater Permit No. S WS 070925 Page 2 of 2 Enclosures: Attachment A — Designer's Certification Form Attachment C — Permitting History Renewal Application Documents DES/ams: \\\Stormwater\Permits & Projem\2007\070925 HD\2021 05 permit 070925 cc: NCDEQ-DEMLR Wilmington Regional Office D_E 0%k, North Carolina Department of Environmental Quality I Division of Energy. Mineral and Land Resources Wilmington Regional Office I L77 Cardinal Drive Extension I Wilmington, North Carolina 28405 main wnu w 910.796.7215 State Stormwater Management Systems Permit No. SW8 070925 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 U.S. Marine Corps Base Camp Lejeune P-671 Aircraft Fire Rescue Facility Curtis Road, MCA New River, Onslow County FOR THE construction, operation and maintenance of an overall 30% low density development with two wet detention ponds for treatment of pockets of high density in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications, and other supporting data as attached and on file with and approved by the Division of Energy, Mineral and Land Resources (the "Division" or "DEMLR") anc considered an enforceable part of this permit The Permit shall be effective from the date of issuance until October 10, 2029 and shall be subject to the following specific conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. This permit covers the construction of 101,558 square feet of built -upon area for the entire project. This permit makes no allocation for any future built -upon area. The overall tract built -upon area percentage for the project must be maintained at 30%, as required by Section .1005 of the stormwater rules. The low density areas are permitted for runoff conveyance by sheet flow, and the runoff from the high density pockets is treated by two wet detention ponds. 4. Approved plans and specifications for projects covered by this permit are incorporated by reference and are enforceable parts of the permit. 5. The only runoff conveyance systems allowed in the low density area will be vegetated conveyances such as swales with minimum side slopes of 3:1 (HM) as defined in the stormwater rules and approved by the Division. 6. No piping is allowed in the low density area except that minimum amount necessary to direct runoff beneath an impervious surface such as a road or to provide access. Page 1 of 8 State Stormwater Management Systems Permit No. SWS 070925 Low density areas covered by this permit will maintain a minimum 30 foot wide vegetative buffer between all impervious areas and surface waters. 8. Roof drains in low density areas must terminate at least 30' from the Mean High Water line. 9. The stormwater systems. to treat the runoff generated by the designated high density areas have been approved for the management of stormwater runoff as described in Section 1.13 on page 3 of this permit. The systems designated as North Pond and South Pond have been approved to treat a maximum of 37,331 ft' and 29,619 ftz of built -upon area, respectively. 10. 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. 11. The runoff from all built -upon area in the designated high density pockets must be directed into the permitted stormwater control system. 12. The following design elements have been permitted for the wet detention pond stormwater facilities, and must be provided at all times. Design Criteria North Pond South Pond a. Drainage Area, acres: Onsite, it' Offsite, ft' 1.79 77,878 None 1.83 79,603 None b. Total Impervious Surfaces, ft' (1) Buildings (2) Roads/Parking (3) Other (4) Offsite 37,331 5,267 31,046 1,018 None 29,619 5,267 21,095 3,257 None c. Design Storrs, inches 1.0 1.0 d. Pond Depth, feet 3.08 3.00 e. TSS removal efficiency 90 90 f. Permanent Pool Elev., FMSL 14.0 14.0 g. Perm. Pool Surface Area, ft' 8,070 6,352 h. Permitted Storage Volume, ft' 4,535 3,588 i. Temporary Storage Elev., FMSL 14.5 14.5 j. Controlling Orifice, "0 pipe 1.0 1.0 k. Permitted Forebay Volume, W 5.195 1 4,515 I. Receiving Stream/River Basin New River / White Oak m. Stream Index Number 19-(15.5) n. Classification of Water Body SC, NSW II. SCHEDULE OF COMPLIANCE The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -upon area. 2. 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. Page 2 of 8 State Stormwater Management Systems Permit No. SW8 070925 Prior to the subdivision and/or sale of this project, in whole or in part, the following deed restrictions must be recorded with the Office of the Register of Deeds: a. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number SW8 070925, 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 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. f. Construction of additional built -upon area in excess of 101,558 square feet will require a permit modification. g. Construction of additional impervious areas such that low density requirements are no longer met must be submitted to the Division and a permit modification must be issued prior to construction. An engineered system will be required to collect and treat the runoff from all built -upon area associated with the project, including that area permitted under the low density option. h. Filling in or piping of any vegetative conveyances (ditches, swales, etc.) associated with this development, except for average driveway crossings, is strictly prohibited by any persons. i. A minimum 30' wide vegetated buffer area shall be provided between surface waters and all impervious surfaces. 4. A copy of the recorded restrictions must be received in this Office within 30 days of the date of sale. 5. Filling in or piping of any vegetative conveyances (ditches, swales, etc.) associated with the permitted development, except for average driveway crossings, is strictly prohibited by any persons. 6. Swales and other vegetated conveyances for low density areas and the stormwater management system for high density pockets shall be constructed in their entirety, vegetated, and be operational for their intended use prior to the construction of any built -upon surface. 7. During construction, erosion shall be kept to a minimum and any eroded areas of the swales or other vegetated conveyances will be repaired immediately. 8. 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, but not limited to: a. Inspections (once every 6 months for detention ponds) b Sediment removal. C. Mowing, and revegetating of the side slopes and vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of side slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of outlet structure, orifice device, flow spreader, catch basins, and piping. p. 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 the Division. The records will indicate the date, activity, name of person performing the work, and what actions were taken. Page 3 of 8 State Stormwater Management Systems Permit No. SW8 070925 10. Within 30 days of completion of the project, the permittee shall certify in writing that the project has been constructed in accordance with the approved plans. 11. The permittee shall submit all information requested by the Director or his representative within the time frame specified in the written information request. 12. 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 1/8 horsepower. 13. 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. 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. 14. 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. 15. 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. 16. 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. 17. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 18. 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. Any items not in compliance must be repaired, replaced restored, or resolved prior to the transfer. Records of maintenance activities performed to date may be requested. Page 4 of 8 State Stormwater Management Systems Permit No. SW8 070925 III. GENERAL CONDITIONS 1. 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. 2. 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. 3. 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. 4. Permit Transfer: 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 "Permit Transfer Application Form" (available on the Division website) accompanied by the required fee and supporting documentation as listed on the form, to the Division at least 60 days prior to any one or more of the following events: a. 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 and protective covenants; b. Dissolution of the partnership, corporate, or LLC entity, subject to NCGS 55-14-05 or NCGS 57D-6-07 and 08, C. Bankruptcy; d. Foreclosure, subject to the requirements of Session Law 2013-121; 5. Current Permittee Name or Address Changes: The permittee shall submit a completed "Permit Information Update Application Form" (available on the Division website) to the Division within 30 days to making any one or more of the following changes: a. A name change of the current permittee; b. A name change of the project; C. A mailing address change of the permittee; 6. The permittee is responsible for compliance with all terms and conditions of this permit until the Division approves the transfer request. Neither the sale of the project, in whole or in part, nor the conveyance of common area to a third party constitutes an approved transfer of the permit. 7. The permittee grants Division Staff permission to enter the property during normal business hours to inspect all components of the permitted project. 8. 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 permit conditions. 9. Approved plans, application documents, supplements, calculations, operation and maintenance agreement, and specifications for this project are incorporated by reference and are enforceable parts of the permit. A copy of this permit, application, supplements, operation and maintenance agreement, and approved plans and specifications shall be maintained on file by the permittee. 10, 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. Page 5 of 8 State Stormwater Management Systems Permit No. SW8 070925 11. 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. 12. 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). Permit renewed, updated and reissued this the 27 day of May 2021. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION G�u.Q .t Brian r� enn Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Page 6 of 8 State Stormwater Management Systems Permit No. SW8 070925 Page 1 of 2 Stormwater Permit No. SW8 070925 P-671 Aircraft Fire Rescue Facility Onslow County Attachment A 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 included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL Page 7 of 8 State Stormwater Management Systems Permit No. SW8 070925 Page 2 of 2 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 Page 8 of 8 Attachment C - Permitting History Aircraft Fire Rescue Facility P671 Permit No. SW8 070925 Approval Date Permit Action RIMS Version Description of the Changes 10/10/2007 Original Approval 10 5/27/2021 Renewal 2.0 UEMLH USE ONLY Date Rqceiveo Fee Paid Permit Number s a I,U�l.Ja1 5 — Spa o o4as" ec m NC DEQ Division of Energy, Mineral and Land Resources STATE STORMWATER: 1ECJ=-I!/E PERMIT RENEWAL APPLICATION FORM In accordance with 15A NCAC 2H.1045(3), the current permit holder shall renew their high density perm�i 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 070925 2. Project name: P-671 Aircraft Fire Rescue Facility High Density Project 3. Project street address: XXX City: MCB Camp Leieune County: Onslow ZIP: 28542 4. What, if any, changes have been made to the project as permitted? N/A 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:Hdeg.nc.gov/about/divisions/energv- 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: htti)s:Hdeg.nc.gov/about/divisions/energy-mineral-land- resources/enerav-mineral-land-rules/stormwater-Droaram/post-construction. State Stormwater Permits do not automatically transfer with the sale of the property. 1. Current Permit Holder's Company Name/Organization: MCB Camp Leieune 2. Signing Official's Name: Neal Paul 3. Signing Official's Title: Deputy Public Works Division 4. Mailing Address: MCB Camp Lejeune 1005 Michael Rd. City: MCB Camp Leieune State: NC ZIP: 28547-2521 5. Street Address: City: State: 6. Phone: (910) 451-2213 Email: neal.paul@usmc.mil ZIP : EGEn riE MAY 11 2021 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 HOW/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: HEB 1. A permit application processing fee of $505.00 payable to NCDEQ. HEB 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. HEB 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. HEB 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. HEB 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. 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 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/by title/ Business Registration MAY 17 2021 By.•�__ Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018 D. P 1TTEE'SCERTIFICATION I, �� CTA. -,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 pro er forms to modify or transfer the permit prior to any changes to the project, SCMs, or ownership. All i rmati provided on this permit renewal application is, to the best of my knowledge, co c 5d,Pomlet Signature: Date: 21 NOTARIZATION: tA L_�F I, EIN`k W enon , a Notary Public for the State of 1�1b� 00-r`Dkcv� I _County of DASLIaW , do hereby certify that �2,6y,at ✓� A, UN c( Y personally appeared before me this the L4 day of a t 1 20 2-1 and acknowledge the due execution of the forgoing instrument. Witness my hand and official seal, (Notary Seal) Notary Signature: My commission expires N� `.�OTARYO�'' P ulav ;may ,. �•: i�'/rrnn r%``� NAY 17 2021 Stormwater Permit Renewal Application Form Page 3 of 3 May 11, 2018 f 07e) 2. 5� ��2��d%- � A �� �` � Permit No. ,��1%P �% (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 maybe phol ocopied for use as an original DWO 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: Contact Person: Phone Number: For projects with multiple basins, specify which basin this worksheet applies to: elevations Basin Bottom Elevation r7 ft. (floor of the basin) Permanent Pool Elevation 1'i- O ft. (elevation of the orifice) Temporary Pool Elevation 4.5 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area (a 36 Z sq. ft. (water surface area at the orifice elevation) Drainage Area k,93 ac. (on -site and off -site drainage to the basin) Impervious Area 0. (ng ac. (on -site and off -site drainage to the basin) volutes Permanent Pool Volume Q I q 4 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 3 cu. ft. (volume detained above the permanent pool) Forebay Volume 166 6 cu. ft. (approximately 20% of total volume) Other parameters SA/DA1 (surface area to drainage area ratio from DWQ table) Diameter of Orifice in. (2 to 5 day temporary pool draw -down required) Design Rainfall in. Design TSS Removal 2 _gQ_ % (minimmn 85% required) Form SWU-102 Rev 3.99 Page 1 of 4 Footnotes: 1 When using the Division SA/D.A 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. 11. 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. I-�� Applicants Initials 7-6-7-6-pp5 lop P NEW IVVWUA< _ a. The permanent pool depth is between 3 andyfeet (required minimum of 3 feet). _ b. The forebay volume is approximately equal to 20% of the basin volume. 9� c. The temporary pool controls runoff from the design storm event. F d. The temporary pool draws down in 2 to 5 days. N 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. It. 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. j. A trash rack or similar device is provided for both the overflow and orifice. 1`I I r" 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 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) 0 does gdoes not incorporate a vegetated filter at the outlet. This system (check one) /does 0 does not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3.99 Page 2 of 4 Maintenance activities shall be performed as follows: 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. 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 6,25 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads Sediment Re oval El. I -------------- Bottom Ele ,ation ) O FORFBAY 3 •o feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 11f.0 Sediment Removal Elevation 9175------- 75°/ -------------------------------- ---- Bottom Elevation 1 25% 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. I 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. 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 County of 0f1t6!J do hereby certify that ��/ 6 personally appeared before me this /_2 `r day of Izo-2 , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, IIDtaY PLOW OeMor Canty mate of Nora+ caolrw IUv Commuslon Eaelru for fa. forte SEAL My commission expires c;2j 6Y o2cJ Form SWU-102 Rev 3.99 Page 4 of 4 Y� COWWi„IDL EIDI:OI OC{ 33, 3GIO am* ul PONY C040mv cumm COMO 69040A ►ROBO VCIC6 v ALE Permit No., 3-w6 cm 9z5 (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 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: RL (0%1 At2eRAFT- Y t R.E. Rescue �7ACtc r+Y Contact Person: M R • CARL BAKER Phone Number: (910) 451 — Z Z 13 For projects with multiple basins, specify which basin this worksheet applies to: NORTk h 6 NO elevations Basin Bottom Elevation $. O b ft. Permanent Pool Elevation 00 ft. Temporary Pool Elevation /V, SO ft. areas Permanent Pool Surface Area e0_40 sq. ft. Drainage Area 1.-19 ac. Impervious Area volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters _� _ Z- _ .. 2qf8s9l cu. ft. L1,535 cu.ft. 5,19 S cu. ft. (floor of the basin) (elevation of the orifice) (elevation of the discharge structure overflow) (water surface area at the orifice elevation) (on -site and off -site drainage to the basin) (on -site and off -site drainage to the basin) (combined volume of main basin and forebay) (volute detained above the permanent pool) (approximately 20% of total volume) SA/DA1 S• (o (surface area to drainage area ratio front DWQ table) Diameter of Orifice 1.0 in. (2 to 5 day temporary pool draw -down required) Design Rainfall 1-0 in. Design TSS Removal 2 90 % (minimum 85%required) Form SWU-102 Rev 3.99 Page 1 of 4 Footnotes: 1 When using the Division S.,VDA 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 13MP manual provides design tables for both 85% TSS removal and 90% TSS removal. IL 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 A008. 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 16y New MA/JUPAC. 7-04 fj a. The permanent pool depth is between 3 and/feet (required minimum of 3 feet). F b. The forebay volume is approximately equal to 20% of the basin volume. F c. The temporary pool controls runoff from the design storm event. JIF- d. The temporary pool draws down in 2 to 5 days. N�A 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. 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. j. A trash rack or similar device is provided for both the overflow and orifice. IJ� k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. 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. in. A mechanism is specified which will drain the basin for maintenance or an emergency. Ill. 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) 0 does /does not incorporate a vegetated filter at the outlet. This system (check one) /does 0 does not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3.99 Page 2 of 4 Maintenance activities shall be performed as follows: 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 .3.0 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (liQ in the blanks) Permanent Pool Elevation ILL Sediment Rc :oval El. 75'° _____________Sediment Remova] Elevation 7•✓ 75% Bottomion10 %_____________________________________________ _____ Bottom Elevation g 25% FOREBAY NIAIN 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. 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. 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. /11 // 1, << l/weY�" a Notary Publicfor the State of County of O-flfld do hereby certify that it 4W personally appeared before me this A2 day of �r/a 1,14 , �, and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, MICE A 80104M CC pofOry ►ubw Ordlow Cowdy 81c1. of Norm Caolrmo Commission Eupatp 0012S.2010 My commission SEAL 0;:4y 65W Form SNVU-102 Rev 3.99 Page 4 of 4