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HomeMy WebLinkAboutSW7050429_CURRENT PERMIT_20050503STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE � CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE DOC DATE 4M_5(�SD 3 YYYYMMDD . Q�O� W A r f9QG 0 � Mr. Brant Wise, Managing Member Northshore Investments, LLC PO Box 791 Elizabeth City, NC 27909 Dear Mr. Wise: Michael F. Easley, Governor Wn:Ro William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources Alan W. Klimek, P.E. Director Division of Water Quality May 3, 2005 Subject: Stormwater Permit No. SW7050429 Harbor Bay Townhomes High Density Project Pasquotank County The Washington Regional Office received a complete Stormwater Management Permit Application for Harbor Bay Townhomes on Apirl 29, 2005. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW7050429 dated May 3, 2005, for the construction of the subject project. This permit shall be effective from the date of issuance until May 3, 2015, 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. If you have any questions, or need additional information concerning this matter, please contact Scott Vinson, or me at (252) 946-6481. Sincerely, A— L^ Al Hodge Regional Supervisor Surface Water Protection Section AH/sav: C:ISTORMWATERIPERMIT1SW7050429 cc: Kenneth Sisk,P,E., The Vision Group P�squotank County Building Inspections ►Washington Regional Office Central Files North Carolina Division of Water Quality Washington Regional Office Phone (252) 946-6481 FAX (252) 946-9215 Internet: h2o,enr.state.nc.us 943 Washington Square Mall, Washington, NC 27999 Customer Service 1-877-623-6749 �roCaj Nnrtur, An Equal Opportunity/Affirmative Action Employer— 50% Recycied110% Post Consumer Paper a State Stormwater Management Systems Permit No. SW7050429 STATE OF NORTH CAROLINA DEPARTMENT 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 Northshore Investments, LLC Harbor Bay Townhomes Pasquotank County FOR THE construction, operation and maintenance of a wet detention pond in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "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. This permit shall be effective from the date of issuance until May 3, 2015, and shall be subject to the following specified conditions and limitations: 1. 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 on page 3 of this permit. The stormwater control has been designed to handle the runoff from 82,503 square feet of impervious area. 3. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans. 4. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. 5. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. Page 2 of 7 State Stormwater Management Systems Permit No. SW7050429 6. The following design criteria have been provided in, the wet detention pond and must be maintained at design condition: a. Drainage Area, acres: b. Total Impervious Surfaces, ftz: C. Design Storm, inches: d. Pond Depth, feet: e. TSS removal efficiency: f. Permanent Pool Elevation, FMSL g. Permanent Pool Surface Area, ftz h. Permitted Storage Volume, ft3: Temporary Storage Elevation, FMSL j. Controlling Orifice: k. Permitted Forebay Volume, ft3: I. Receiving Stream/River Basin: M. Stream lndex Number: n. Classification of Water. Body: II. SCHEDULE OF COMPLIANCE 4.10 82,503 1.0 5.0 . 90% 7.50 9,122 16,720 8.16 1.50" O pipe 3,107 Pasquotank River 1 Pasquotank 30-3-(12) PPSB" 1. 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. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of outlet structure, orifice device, flow spreader, catch basins and piping. g. Access to the outlet structure must be available at all times. 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. Page 3 of 7 State Stormwater Management Systems Permit No. SW7050429 5. Decorative spray fountains will be allowed in the stormwater treatment system, subject to the following criteria: a. The fountain must draw its water from less than 2' below the permanent pool surface. b. 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. c. The falling water from the fountain must be centered in the pond, away from the shoreline. d. The maximum horsepower for a fountain in this pond is 1/8 horsepower. 6. The facilities shall be constructed as shown on the approved plans. 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. 7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 8. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 9. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 10. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 11. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 12. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. 13. 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 Page 4 of 7 State Stormwater Management Systems Permit No. SW7050429 shall provide copies of revised plans and certification in writing to the Director that the changes have been made. 14. This permit shall be effective from the date of issuance until May 3, 2015. Application for permit renewal shall be submitted 180 days prior to the expiration date of this permit and must be accompanied by the processing fee. III. GENERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director. In the event of a change of ownership, or a name change, the permittee must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, 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. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 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 143-215.6A to 143-215.6C. 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) having jurisdiction. 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 permittee grants DENR Staff permission to enter the property during normal business hours for the pur ose of inspecting all components of the permitted stormwater management facility. 6. 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. 7. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 8. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 9. The permittee shall notify the Division of any name, ownership or mailing address changes within 30 days. Permit issued this the 3Id day of May, 2005. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Division of Water Quality By Authority of the Environmental Management Commission Page 5 of 7 State Stormwater Management Systems Permit No. SW7050429 Harbor Bay Townhomes Stormwater Permit No, SW7 050429 Pasguotank County 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 6 of 7 State Stormwater Management Systems Permit No. SW7050429 Harbor Bay Townhomes Stormwater Permit No. SW7 050429 Pasquotank County 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: NCDENR-DWQ Regional Office Pasquotank County Building Inspections Page 7 of 7 Energy, Mineral & Land Resources ENVIRONMENTAL QUALITY The Ladicon Corporation Attention: Ellen Finelli, President P.O. Box 448 Elizabeth City, NC 27907-0448 Dear Ellen Finelli: ROY COOPER MICHAEL S. REGAN tirrrrfa+ y WILLIAM E. (TOBY) VINSON, JR. 1n tel im I )it ref, August 8, 2018 Subject: Stormwater Permit Renewal & Ownership Change Stormwater Management Permit SW7050429 Harbor Bay Townhomes Pasquotank County A Division of Energy, Mineral, and Land Resources file review has determined that Stormwater Permit SW7050429 for a stormwater wet detention system serving the Harbor Bay Townhomes located on Harbor Bay Dr. in Elizabeth City, NC expires on May 3, 2019. Renewal applications are due 180 days prior to expiration. The permit was originally issued to Northshore Investments, LLC. A search of the Pasquotank County tax records shows that the property covered under this permit is now owned by The Ladicon Corporation. North Carolina General Statutes and the Coastal Stormwater rules require that this property be covered under a stormwater permit. Please submit a completed permit renewal application along with a $505.00 fee for permit renewal and an ownership change application with another $505.00 application fee. Permit application forms for renewal and ownership change can be found on our website at: https-. Idea.nc.gov/about/divisions/enerav-mineral-land-resources/enerov- mineral-land-rules/stormwater-pro, ramlpost-constructions. North Carolina General Statutes and the Coastal Stormwater rules require that this property be covered under a stormwater permit. Failure to maintain a permit subjects the owner to assessment of civil penalties. If you have questions, please feel free to contact me at (252) 948-3923. 1 will be glad to discuss this by phone or meet with you. I can e-mail an electronic copy of these application forms to you if you wish. Let me know by sending an e-mail to roger.thorpe@ncdenr_gov. Sincerely, Roger K. Thom Environmental Engineer Siate0iNorthCarolina I LnvironmenlalQuality I Energy. MinclalaildLand Resources Washington Regional OFricr } W3 Washington %quart Mall I Washington. NC 27884 2S194b 6481 W a a— *-- Ll A a A7-& ni OFFICE USE ONLY Date Received Fee Paid Permit Number ckA o W aSayXi W-'VVARO State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): Northshore Investments LLC 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Brant Wise. Manaoina Member 3. Mailing Address for person listed in item 2 above: P.O. Box 791 City: Elizabeth City State:_ NC _ Zip:_ 27909 Telephone Number: ( _252 _} 202-8989____ 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Harbor Bay Townhomes 5. Location of Project (street address): River Road City: Elizabeth City County: Pasquotank 6. Directions to project (from nearest major intersection); The_project is located on the west side of River Road (NCSR 116.9)approximately 2 000 feet north from the Intersection of River Road and Weeksville Road. 7. Latitude: 76.21 Long itude:_36-.27 of project 8. Contact person who can answer questions about the project: Name: Kenneth Sisk P.E. Telephone Number: ( 757 } 427-3480 II. PERMIT INFORMATION: 1. Specify whether project is (check one): X New Renewal Modification Form SWU-101 Version 3,99 Page l of t 4 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number and its issue date (if known) 3. Specify the type of project (check one): Low Density X 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 1, 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. Stormwater will-beAreated via_3_enhanced-grass-swales.2 forebaM_and 2-ponds conaected_by_an24equalizer-pipe _ The outlet structure includes a water quality orifice which will draw down the 1" runoff volume. 2. Stormwater runoff from this project drains to the Pasquotank River basin. 3. Total Project Area: 4.1 acres 4. Project Built Upon Area: 44.9% % 5. How many drainage areas does the project have? i 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 1 Drainage Area 2 Receiving Stream Name Pasuotank River Receiving Stream Class ,�C SgAc, I E 9 xi ° d V , 3-Cix Drainage Area 4.1 Acres Existing Impervious* Area 35,150 SF = .81 Acres Proposed Impervious*Area 80,203 SF = 1.84 Acres % Impervious* Area (total) 44.9% Impervious* Surface Area Drainage Area I Drainage Area 2 On -site Buildings V,520 SF = .8S Acres On site Streets 37,852 SF = 0.87 Acres !/01 t On -site Parking 9soo F -ayA r (✓ q On -site Sidewalks 4 631 SF = 0.10 Acres ` Other on -site Off -site Total: SF = 1. Acres Total: Impervious area is defined as the built upon area including, but not limited to. buildings, roads, parking areas, sidewalks. gravel areas, etc. Form S WU-101 Version 3.99 Page 2 of 4 7. How was the off -site impervious area listed above derived 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 stormwater management permit number S LA) 4 O5 0 `{ A 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 ofanylot 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 systern 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 Managernent. 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. 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 KAS KAS KAS KAS KAS - 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 calculation - Drainage areas delineated - Vegetated buffers (where required) VIL 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): Kenneth Sisk P.E. Mailing Address: 2636 Christopher Farms Drive City: Virginia Beach State: VA Zip: 23453 Phone: L_757_) 427-3480 Fax: ( 757 ) 427-3481 VIII, APPLICANT'S CERTIFICATION I, (print or type name of person listed in General Information, item 2) Brant Wise, Managing Member 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. Sigr Form SWU-101 Version 3.99 Page 4 of Date: 4' Iq .05 4. Pcrmit No. SW 7o_15_n r Zq (to he provided by DlV& State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FOR.1VI����.�'�� WET DETENTION BASIN SUPPLEMENT APR 2 2 2005 This form may be Photocopied for use as an original DWO Stormwater Management Plan Review: D Q-WtARO 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. 1. PROJECT INFORMATION Project Name: Harbor Bay Townhomes Contact Person: Kenneth Sisk P.E. Phone Number: LZ57 For projects with multiple basins, specify which basin this workshect applies to: _ 427-3480 elemlions Basin Bottom Elevation 2.5 ft. (floor of the basin) Permanent Pool Elevation 7.5 ft. (elevation of the orifice) Temporary Pool Elevation 8.16 ft. (elevation of the discharge structure overflow) areas � 122. Permanent Pool Surface Area 1 sq, ft. Y(viwfer su face area at the orifice elevation) Drainage Area 4.1 ac. (on -site crud off -site diwinage to the basin) Impervious Area 1.81 ac. (on -site and of drainage to the basin) vol7nnes Permanent Pool Volume 16.720 cu. ft. (combined volume (?f main bcisin 177d /brebav) Temporary Pool Volume 6,75$ Cu. ft. (vohune detained above the permanent pool) Forebay Volume 3,107 cu. ft. (approximately 20% of total volinne) Other parameters it%r/or SA/DAI 3.90 ��(surfoce area to drainage area ratio from D;J7Q table) Diameter of Orifice Ir?l 1150 in. (2 to 5 day temporciry pool dreiw-down required) Design Rainfall 1 in. Design TSS Removal 2 90 % (rrlinilMun 85% required) Form SWU-102 Rev 3.99 Page 1 of 4 k Footnotes: When using the Division SAIDA tables, the correct SAIDA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be employed to deterniine the correct value for non- standard table entries. '- 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 KAS a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). KAS b. The forebay volume is approximately equal to 20% of the basin volume. KAS c. The temporary pool controls runoff from the design storm event. KAS d. The temporary pool draws down in 2 to 5 days. NIA c. if required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) KAS f. The basin length to width ratio is greater than 3:1. KAS g. The basin side slopes above the permanent pool arc no steeper than 3:1. KAS h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). KAS i. Vegetative cover above the permanent pool elevation is specified. WR Y rash �r��r. or similar device is provided for both the overflow and orifice. NIA k. A recorded drainage casement is provided for each basin including access to nearest right- of-way. KAS 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. KAS m. A mechanism is specified which will drain the basin for maintenance or an emergency. II1. 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 X does not incorporate a vegetated filter at the outlet. This system (check one) X does 0 does not incorporate pretreatment other than a forebay. (Enhanced grassed swales) Form SWU-l02 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 3.75 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 2.62 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanka) Permanent Pool Elevation 7.50 li, 77s , j Sediment Ren oval El..16 ----- Sediment Removal Elevation 3.75 75°/n Bottom Ele ation 4-0 `%u---------------------------------------------- ------ FOREBAY Bottom Elevation 2.50 ♦ 25% MAIN POND 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 rage 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. Print name: Brant Wise Title: Managing Member for Northshore Investments LLC Address: P.O. Box 791, Elizabeth City, NC, 27909 Phone: (252) 202-8989 Signature: Date: a_t , I9 • CJ`-E> Note: The legally responsible party should not be a homeowners association unless more than 501%, of the lots have been sold and a resident of the subdivision has been named the president. I, �Q�h��• �e 1 �r a Notary Public for the State of VI try s n icy _ of V, yI d L� , do hereby certify that Il rc tl t �. Svc personally appeared before me this (�(+h day of and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, C-vc__d�I� ,.YF,,,,,, SEAL My Common E)Wkw My commission expires February 29, 2008 Form SWU-102 Rev 399 Page 4 of 4