Loading...
HomeMy WebLinkAboutSW8030720_Permit (Reissued)_20210914State Stormwater Management Systems Permit No. SW8030720 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 United States Marine Corps Courthouse Bay Regional Pond Marines Road, Courthouse Bay, Camp Lejeune, Onslow 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 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 and considered a part of this permit. This permit shall be effective from the date of issuance until January 26, 2027, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.7 of this permit. The final built -out condition of this stormwater system has been designed to handle the runoff from 1,621,289 square feet of impervious area. The current condition of this stormwater system has been designed to handle the runoff from 960,509 square feet of impervious area. 3. This wet detention pond must be operated with a 30-foot vegetated filter strip. 4. The tract will be limited to the amount of impervious area indicated in Section 1.7 of this permit, and per approved plans. The impervious area for the future development within the current drainage area and condition of this stormwater system is limited to 98,194 square feet. Future impervious area within the final built -out drainage area and condition of this stormwater system is limited to an additional660,780 square feet or a total of 853,370 square feet. Page 1 of 6 State Stormwater Management Systems Permit No. SW8030720 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. The runoff from all impervious area within the permitted drainage area(s) of this project must be directed into the permitted stormwater control system. 7. The following design criteria have been provided in the wet detention pond and must be maintained at design condition: Current Condition a. Drainage Area, acres: 50.574 Final Built -Out Condition 77.85 Onsite, ft2: 2,203,003 2,996,035 Offsite, ft2: (from SW8 010431) 0 395,068 b. Total Impervious Surfaces, ft2: 960,509 1,621,289 767,919 853,370 Allocated 862,315 98,194 Total Future, ft2: Onsite Future, ft2 98,194 592,010 Offsite, fie: (from SW8 010431) 0 261,360 c. Design Storm, inches: 1.0 1.0 d. Pond Depth, feet: 4.0 4.0 e. TSS removal efficiency: (a 30' vegetated filter is required) 85% 85% f. Permanent Pool Elevation, FMSL: 7.38 7.38 g. Permanent Pool Surface Area, ft2: Permitted Storage Volume, ft3: Temporary Storage Elevation, FMSL: 62,870 133,239 172,597 h. 102,380 i 8.92 4 each @ TO pipes 8.92 8 each @ TO pipes j. Controlling Orifice: _ Permanent Pool Volume, ft3: rmtted Forebay Volume, ft3: untain Horsepower, HP k. 193,648 521,674 106,582 TF 37,455 3/4 2 n. Receiving Stream/River Basin: New River Restricted Area #2/White Oak o. Stream Index Number: 19-37 p. Classification of Water Body: SC II. SCHEDULE OF COMPLIANCE The first phase of the stormwater system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any impervious surface associated with this project. Page 2 of 6 State Stormwater Management Systems Permit No. SW8030720 2. The final built -out condition of the stormwater system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any impervious area in excess of the 192,590 square feet of future impervious area permitted under the current condition of the system. 3. 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. 4. The permittee must maintain compliance with the limits of the permitted impervious area and ensure that the runoff from all the built -upon area is directed into the permitted system. 5. The permittee must maintain the current permitted drainage area. No runoff from outside of the permitted drainage area boundary may enter the permitted stormwater facilities without first applying for and receiving a permit modification. 6 During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 7. The permittee shall at all time 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 re -vegetation 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. 8. 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. Page 3of6 State Stormwater Management Systems Permit No. SW8030720 9. Decorative spray fountains will be allowed in the stormwater treatment system, 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 2 horsepower. 10. 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. 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. Access to the stormwater facilities for inspection and maintenance shall be maintained via appropriate recorded easements at all times. 14. 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. 15. 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. 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. Page 4of6 State Stormwater Management Systems Permit No. SW8030720 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. 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. Page 5 of 6 State Stormwater Management Systems Permit No. SW8030720 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 modified, updated, and reissued this the 14th day of September 2021. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Brian Wrenn, Director Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Page 6 of 6