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HomeMy WebLinkAboutSW7070221_CURRENT PERMIT_20071113STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW-V Z= I DOC TYPE EY CURRENT PERMIT APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE IlZ-/5 YYYYMMDD Wa::Ko TF,9 Michael F. Easley, Governor OG William G. Ross Jr., Secretary QNorth Carolina Departrnent of Environment and Nature] Resources .� Coleen H. Sullins, Director Division of Water Quality DIVISION OF WATER QUALITY November 13, 2007 NN&W Attn: Mr. Patrick Whitehurst 199 Mill Street Elizabeth City, NC 27909 Subject: Dear Mr. Whitehurst: Stormwater Permit No. SW7070221 Nixons Terrace High Density Stormwater Project Perquimans County The Washington Regional Office received revised plans and supporting information for the subject project on August 16, 2007, 2007. It has been determined that this project will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit SW7070221 dated November 13, 2007 to NN&W for the construction and operation of a constructed wetland system to serve Nixons Terrace located off NC37 at Winfall, NC. This permit shall be effective from the date of issuance until November 13, 2017, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system 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 upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611- 7447. Unless such demands are made this permit shall be final and binding. North Carolina Division of Water Quality Intemet: h2o.enr.state.nc.us 943 Washington Square Mail Phone: 252-946-6481 Washington, NC 27889 FAX 252-946-9215 An Equal Opportunity/Affirmative Acton Employer— 50% RecycledA 0% Post Consumer Paper NorthCarohna Natura!!t, NN&W November 13, 2007 Page Two If you have any questions, or need additional information concerning this matter, please contact Bill Moore at (252) 948- 3919. S'nceLely,Rel Tonal g Supervisor Surface Water Protection Section Washington Regional Office cc: Resource International, LTD Perquimans County Planning/Inspections Washington Regional Office Central Files State Stormwater Management Systems Permit No. SW7070221 STATE OF NORTH CAROLINA OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY 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 NN&W Perquimans County FOR THE construction, operation and maintenance of stormwater management systems 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 Water Quality and considered a part of this permit for grass swales, vegetated buffers and a constructed wetland system to serve Nixons Terrace located at Winfall, NC. This permit shall be effective from the date of issuance until November 13, 2017, and shall be subject to the following specified conditions and limitations: 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 on page 4 of this permit, the Project Data Sheet. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 3 DIVISION OF WATER QUALITY PROJECT DATA Project Name: Nixons Terrace Permit Number: SW7070221 Location: Perquimans County Applicant: NN&W Mailing Address: 199 Mill Street Elizabeth City, NC 27909 Application Date: 02/20/2007; original 08/16/2007; complete Receiving Stream: UT-Perquimans River Stream Classification: SC Total Site Area: 12.9 acres Total Impervious: 2.77 acres Area Allowed Wetland Depth: 1.0 ft Required Storage Volume: 11,231cf Provided Storage Volume: 11,308 cf Required Surface Area: 11,231 sf Provided Surface Area: 12,285 sf Controlling Orifice: drawndown orifice 2.0-inch at elevation 4.5 ft. 0 4. No homeowner/lot owner/developer shall be allowed to fill in, alter, or pipe any vegetative practices (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the permit and receiving approval from the Division. 5. The following items will require a modification to the permit: a. Any revision to the approved plans, regardless of size b. Project name change C. Transfer of ownership d. Redesign or addition to the approved amount of built - upon area e. Further subdivision of the project area. In addition, the Director may determine that other revisions to the project should require a modification to the permit. 6. 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. II. SCHEDULE OF COMPLIANCE 1. The permittee will comply with the following schedule for construction and maintenance of the stormwater management system. a. 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 surfaces except roads. b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 2. The facilities must be properly maintained and operated at all times. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency including, but not limited to: 5 a. Semiannual scheduled inspections (every 6 months) b. Sediment removal C. Mowing and revegetation 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 outlet structure, orifice device and catch basins and piping. 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken. 5. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 6. Upon completion of construction 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. Mail the Certification to the Washington Regional Office, 943 Washington Square Mall, Washington, North Carolina, 27889, attention Division of Water Quality. 7. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of five years from the date of the completion of construction. III. GENERAL CONDITIONS 1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a formal permit request must be submitted to the Division of Water Quality accompanied by an application fee, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. 2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6(a) to 143-215.6(c). 3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction. 6 4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 5. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 6. At least six months prior to the expiration date, the permittee must submit a written request for permit renewal to the Division of Water Quality, Washington Regional Office. Permit issued this the 13 th day of November, 2007. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION L- r'Coleen H. Mullins, Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW7070221 7 Stormwater Permit No. SW7070221 Nixons Terrace Swales, Vegetated Buffers, and Constructed Wetland System Perquimans County Designer's Certification as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, for (Project) (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. Signature Registration Number Date I U'' a1SLimV� �tLw OFFICE USE ONLY Date RecueivedL Fee Paid IPermit Number IF FFR 9 n m i ++ark ®11pp,,((�� 11gg,,ryry DD State of North Carolina gtl�C tl�nRDepartment of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may he photocopied for use as an original G o I. GENERAL INFORMATION $(7/ 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): W t4 W 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): 3. Mailing Address for person listed in item 2 above: 1g' M I�t. Sri-as-r City: ELI}AgeTo Cif" State: Zip: Telephone Number: (252 ) 338 — S2 11 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): NM-10,�S TOV-4ZAe,9 5. Location of Project (street address): N C- City: \n/I'+FPu. County: PPa0yIMAtf'S 6. Directions to project (from nearest major intersection): APP0vx4A4*T9ly 180o FT Sovr+{ OtJ We, W6%i4w'k-1 3�- FPor'l 'ENE Irire"ELTIo�j OF MAi'J STvx-T hz"o NG Ntc w4-t 7. Latitude: • ?'1 Longitude: T`• 45 W of project S. Contact person who can answer questions about the project: Name: M EL }{oPy+JS- .; pl; • Telephone Number: II. PERMIT INFORMATION: 1. Specify whether project is (check one): X New Renewal Modification Form SWU-101 Version 3.99 Page I of 4 2. If this application is being submitted as th� result of a renewal or modification to an existing permit, list the existing permit number N A and its issue date (if known) 3. Specify the type of project (check one): Low Density i High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): _CAMA Major X Sedimentation/Erosion Control 404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION I. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. THE RuwoFP Vy6wPev AeEA Wtu ?6 6oNVG'(s9 To A 1,7tC s 0-> FPV-ii-IT`1 AT TkE Imo¢ of THE THE VSTF-Mao Fg<-R-" IS DES Wlru A Loo FLow 04lFK.6 .THS D0A'-3D0wrJ Time, f6� l-tru•t --rower[ IS 2. Stormwater runoff from this project drains to the PBRR u1T 1 ANDS River basin. 3. Total Project Area: 12 _ `1 acres 4. Project Built Upon Area: 21.S % 5. How many drainage areas does the project 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Basin Information Drainage Area I Drainage Area 2 Receiving Stream Name U A 'S I V 612 Receiving Stream Class Drainage Area 5& o (,31 FT' /Z • 87 Existing Impervious' Area 0 Proposed Impervious*Area F*' % Impervious* Area (total) Impervious* Surface Area Drainage Area I Drainage Area 2 On -site Buildings CJI �p 2 On -site Streets f:7Tl On -site Parking 2 p 660 L On -site Sidewalks �- Other on -site Off -site — Total: 1 Lp� 3 (o Total: Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form SWU-101 Version 3.99 Page 2 of 7. How was the off -site impervious area listed above derived? N N IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment. 1. The following covenants are intended to ensure ongoing compliance with state storrrtwater management permit number as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. 2. No more than square feet of any lot shall be covered by structures or impervious materials. Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood decking or the water surface of swimming pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. 4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction. 5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted -- - without concurrence from the State, and that they will be recorded prior to the sale of any lot. - -- V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of 4 VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form • One copy of the applicable Supplement Form(s) for each BMP ` • Permit application processing fee of $420 (payable to NCDENR) • Detailed narrative description of Stormwater treatment/management • Two copies of plans and specifications, including: - Development/Project name - Engineer and firm -Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm): NIELv1J E • NoPk-1a5- JT YZ l P. E Mailing Address: i'5( TfiiMe-L-r-- SpAoPLs Suite �.1 City: N6wyowT NEWS State:yA Zip: 23�oto Phone: ( '}S4' ) — \ . Fax: ( �4S} ) fi'13 — -'4 �2 VIII. APPLICANT'S CERTIFICATION I, (print or type name_of person listed in General Information, item 2) 91? •ck G 11, �r1 ur Sf certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC 2H .1000. Signature: �s% Date: 07 Form SWU-101 Version 3.99 Page 4 of DWOProjectNo. sW _+0}02Z1 AUG 1 0 2007 DMSION OF WATER QUALITY - 401 EXTENDED DETENTION (and POCKET*) WETLAND WORKSHEET I. PROJECT INFORMATION (please complete the following information): Project Name : i� 1 !S-fEEQ�AGE Contact Person: E1¢EE► MIL51 AO Phone Numbef: For projects with multiple basins, specify which basin this worksheet applies to: N7 A Permanent Pool Elevation Temporary Pool Elevation Permanent Pool Surface Area Drainage Area Impervious Area Forebay Surface Area Marsh 0"-9" Surface Area Marsh 9"-18' Surface Area Micro Pool Surface Area Temporary Pool Volume SA/DA used Diameter of Odfice REQUIRED ITEMS CHECKLIST 4.5 ft. 5.28 ft. $ sq. ft •l v ac. 3� ac. 1183 sq. ft. SA sq. ft. o I- sq. ft. to sq. ft. cu. ft. (elevation of the orifice invert out) (elevation of the outlet structure invert in) (water surface area at permanent pool elevation) (on -site and off -site drainage to the basin) (on -site and off -site drainage to the basin) (at permanent pool elevation approximately 15%)' (at permanent pool elevation approximately 35%)' (al permanent pool elevation approximately 35%)' (at permanent pool elevation approximately 15%)' (volume detained on top of the permanent pool) A 'i.kP�'c MA43-^A)surface area to drainage area ratio)' 2 in. (draw down orifice diameter) Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. ffa 2gm1?eme17/h8s not been met, a((ach an exolanafion ofwhy At a minimum, a complete stormwater management plan submittal indudes a worksheet for each BMP, design calculations, plans and specifications showing all BMPs and outlet structure details, a detailed drainage plan and a fully executed operation and maintenance agreement. An incomplete submittal package will result in a request for additional information and will substantially delay final review and approval of the project Aoolicants Initials CoA4 The temporary pool controls runoff from the 1 inch rain. !� ^^ The basin side slopes are no steeper than 3:1. M A planting plan for the marsh areas with plant species and densities is provided. 6 M Vegetation above the permanent pool elevation is specified. &AI An emergency drain is provided to drain the basin. &A4 The temporary pool draws down in 2 to 5 days. GM Sediment storage is provided in the permanent pool. FoM A sediment disposal area is provided. (oM Access is provided for maintenance. . (aM A site specific, signed and notarized operation and maintenance agreement is provided. CoM The drainage area (including any offsite area) is delineated on a site plan. (D Nl Access is provided for maintenance. "� Plan details for the wetland are provided. Plan details for the inlet and outlet are provided. G M A site specific operation and maintenance agreement, signed and notarized by the responsible party is provided (see http:/fh 2o. eh nr.state. nc. ustncweflands/oandm.doc). Pocket Wetlands have different design parameters and are only assumed to remove 35%TSS — See pp. 19 and 20 of the NC DENR StormwaterBMP Manual, April 1999. 10%open water, 50%high marsh, 40%low marsh. WETLAND DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT The wetland detention basin system is defined as the wetland detention basin, pretreatment including forebays and the vegetated filter if one is provided. , . Maintenance activities shall be performed as follows: AUG 1 2007 1. After every significant runoff producing rainfall event and at least monthly: a. Inspect the wetland 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 wetland 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 wetland 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. If the elevation of the marsh areas exceed the permanent pool elevation, the sediment should be removed to design levels. This shall be performed by removing the upper 6 inches of soil and stockpiling it. Then the marsh area shall be excavated six inches below design elevations. Afterwards the stockpiled soil should be spread over the marsh surface. The soil should not be stockpiled for more than two weeks. When the permanent pool depth reads 0.92 feet in the forebay and micro -pool, the sediment shall be removed. BASIN DIAGRAM p 1 Permanent Pool Elevation 4_5 Sediment emoval El. 3.58 I 75% Sediment Removal Elevation 4.01 75% ----------------------------------------------- --- Elevation 1.0 25% Bottom Elevation 3_5 25% I / FOREBAY MAIN POND ,AUG 1.4,2007 06:41A 2522642712 page 3 nu 5. 1, te,,r i.LIIM I u. in t e i Rd 10 Rd 1, uu• No. ISllh r. 'i.-'j S. Remove cattails and other Wigenous wetland plants when they cover 60% of the basin surface. These plants shall be encouraged to grow along the vegetated ah9m and forebay berm. Wetland planting densities in the marsh areas should be maintained by replanting bare areas as needed Wetland plants should be encouraged to grow in the marsh areas B. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be mthimtsed to the maximum extent prdctic 7. All components of the wetland detention basin system shall be maintained in good working order. B. Level spreaders or other structures that provide diffuse Clow shall be maintained every six months. All accumulated sediment and debris shall be removed from the structure, and a level elevation shall be maintained across the entire flow spreading structure. Any down gradient erosion must be repaired and/or replanted as necessary. I acknowledge and egg by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to nodly, DWO of any problems with the system or prior to any changes to the system or responsible party. Print Note: The legally responsible party should not be a homeowners essocfation unless more it 60% of the lots have been sold and a resident of the subdivision has been named the president. 1, S. � , a Notary Public for the State of N0,41I. Cs+.o )7,, County of E ";mans do hereby certify that _ _-172c%n L { 1-1- ,rsl -J—i personally appeared before me this /11 day A l,4g., <+- 0 7 and acknowledge the due execution of the forgoing wetland detention basin maintenance requirements. Witness my hand and official seal, ........... QQ NOTAgY.GyN O • PUgLIG _ Q=AI My commission expires /%lam /(� Aoog AUC 07,2007 12;12A 757 873 7712