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HomeMy WebLinkAboutSW8051138_CURRENT PERMIT_20060111STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMMDD �OF W ATFR p Michael F. Easley, Governor O G William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources 0 Alan W. Klimek, P. E. Director Division of Water Quality January 11, 2006 Mr. Keith Walker, President EdenBridge Housing of Morehead City, Inc., Manager Eden Bridge, LLC 315 Turner Street Beaufort, NC 28516 Subject: Stormwater Permit No. SW8 051138 Eden Bridge High Density Subdivision Project Carteret County Dear Mr. Walker: The Wilmington Regional Office received a complete Stormwater Management Permit Application for Eden Bridge on January 10, 2006. 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. SW8 051138, dated January 11, 2006, for the construction of the project, Eden Bridge. This permit shall be effective from the date of issuance until January 11, 2016, 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 Robert Gordon, or me at (910) 796-7215. Sincer Edward Beck Regional Supervisor Surface Water Protection Section ENBlydg: S:IWQSISTORMWATIPERMIT1051138.jan06 cc: Ron Cullipher, PE, Stroud Engineering Katrina Marshall, Carteret County Inspections Robert Gordon Wilmington Regional Office Central Files North Carolina Division of Water Quality 127 Cardinal Drive Extension Phone (910) 796-7215 Customer Service 1 -877-623-6748 one Wilmington Regional Office Wilmington, NC 28405-3845 FAX (910) 350-2004 Internet: h2o.enr.state.nc.us NorthCarol/iIla An Equal Opportunity/Affirmative Action Employer— 50% Recycled110% Post Consumer Paper Natl�t',/11 State Stormwater Management Systems Permit No. SW8 051138 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 Mr. Keith Walker & Eden Bridge, LLC Eden Bridge Morehead City - Carteret County FOP, THE construction, operation and maintenance of 3 wet detention ponds 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 January 11, 2016 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 in Section 1.6 on page 3 of this permit. The subdivision is permitted for 3 lots, each allowed the following built -upon area per lot: lot 1 — 58,054 sf, lot 2 — 65,066 sf. Lot 3 — 18,912 sf. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 4. The runoff from all built -upon area within the permitted drainage area of this project.must be directed into the permitted stormwater control system. 5. 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. 07o n >of0 State Stormwater Management Systems Permit No. SW8 051138 6. The following design elements have been permitted for this wet detention pond stormwater facility, and must be provided in the system at all times. ,Units , ,„w°�Pond I ,r; Pond"##2 ; £ Pond 43 a Drainage Area Acres 2.47 2.53 1.75 Onsite ft2 107,591 110,439 76,387 Offsite ft2 0 0 0 Total Impervious Surfaces 58,054 87,173 43,227 Buildings 19,739 0 0 Roads/Parking 34,310 22,107 19,702 Sidewalks ft2 4,005 0 3,493 Other 0 0 1,120 Future 0 65,066 (lot 2) 18,912 (lot3) Offsite 0 0 0 Pond Depth feet 5.0 6.0 4 TSS removal efficiency % 90 90 90 Design Storm. inches 1 1 1 Permanent Pool Elevation FMSL 13.0 13.0 13.2 Permitted Surface Area @PP ft 5,882 6,375 3,850 Permitted Storage Volume ft 6,941 7,429 4,645 Storage Elevation FMSL 14.0 14.0 14.2 Controlling Orifice "0 pipe 1.25 1.25 1 Permanent Pool Volume ft 12,109 15,469 6,519 Forebay Volume ft 3,029 3,005 1,301 Maximum Fountain HP 1/8 1/8 1/8 Horsepower Receiving Stream',;F`�Y":;;;;;: Calico Creek River Basin=a'e White Oak Stream index Number 21-32 Classification of Water Body SC; HQW II. SCHEDULE OF COMPLIANCE 13. No homeowner/lot owner/developer shall fill in, alter, or pipe any drainage feature (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. 14. The permittee is responsible for verifying that the proposed built -upon area for the entire lot, including driveways and sidewalks, does not exceed the allowable built -upon area. Once the lot transfer is complete, the built -upon area may not be revised without approval from the Division of Water Quality, and responsibility for meeting the built -upon area limit is transferred to the individual property owner. 15. If an Architectural Review Board or Committee is required to review plans for compliance with the BUA limit, the plans reviewed must include all proposed built -upon area. Any approvals given by the Board do not relieve the homeowner of the responsibility to maintain compliance with the permitted BUA limit. 16. 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. D-,..,. 1 -4: n State Stormwater Management Systems Permit No. SW8 051138 5. 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. f. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 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. 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. Permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual, 10. Prior to the sale of any lot, the following deed restrictions must be recorded: a. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number SW8 051138, as issued by the Division of Water Quality 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 Water Quality. e. Alteration of the drainage as shown on the approved plans may not take place without the concurrence of the Division of Water Quality. f. The maximum built -upon area per lot is BUA per lot square feet. This allotted amount includes any built -upon area constructed within the lot property boundaries, and that portion of the right-of-way between the front lot line and the edge of the pavement. Built upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. g. The runoff from all built -upon area on the lot must drain into the permitted system. This may be accomplished through providing roof drain gutters which drain to the street, grading the lot to drain toward the street, or grading perimeter swales and directing them into the pond or street. Lots that will naturally drain into the system are not required to provide these measures. h. Built -upon area in excess of the permitted amount will require a permit modification. i. Each lot within the subdivision whose ownership is not retained by the permittee, must submit a separate Offsite Stormwater Management Permit application package to the Division of Water Quality and receive a permit prior to any construction on the lot. 0-onn A rJ 0 State Stormwater Management Systems Permit No. SW8 051138 11. A copy of the recorded deed restrictions must be submitted to the Division within 30 days of the date of recording the plat, and prior to selling lots. The recorded copy must contain all of the statements above, the signature of the Permittee, the deed book number and page, and the stamp/signature of the Register of Deeds. 12. 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 the fountain's pump is based on the permanent pool volume. The maximum pump power for a fountain in any pond is 1 /8: 14. 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: b. Any revision to the approved plans, regardless of size. c. Project name change. A Transfer of ownership. e. Redesign or addition to the approved amount of built -upon area. f. Further subdivision, acquisition, 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. g. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 14. The Director may determine that other revisions to the project should require a modification to the permit. 15. Prior to transfer of the permit, the stormwater facilities will be inspected by DWQ personnel. The facility must be in compliance with all permit conditions. Any items not in compliance must be repaired or replaced to design condition prior to the transfer. Records of maintenance activities performed to date will be required. 16. The permittee shall at all times provide the operation and maintenance necessary to assure that all components of the permitted stormwater system function 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 side slopes. d. Immediate repair of eroded areas. e. Maintenance of side slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of structures, orifice, catch basins and piping. g. Access to all components of the system must be available at all times. State Stormwater Management Systems Permit No. SW8 051138 17. 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. 18. 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. 19. Built upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. 111. GENERAL CONDITIONS This permit is not transferable to any person or entity except after notice to and approval by the Director. In the event there is either a desire for the facilities to change ownership, or there is a name change of the Permittee, a "Name/Ownership Change Form" must be submitted to the Division of Water Quality accompanied by appropriate documentation from the parties involved. This may include, but is not limited to, a deed of trust, recorded deed restrictions, Designer's Certification and a signed Operation and Maintenance plan. The project must be in good standing with DWQ. The approval of this request will be considered on its merits and may or may not be approved. 2. The permittee is responsible for compliance with all of the terms and conditions of this permit until such time as the Director approves the transfer request. 3. 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. 4. 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. 5. 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. 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. Permittee grants permission to staff of the DWQ to access the property for the purposes of inspecting the stormwater facilities during normal business hours. 8. The permittee shall notify the Division of any name, ownership or mailing address changes within 30 days. Pnno R of 0 State Stormwater Management Systems Permit No. SW8 051138 9. 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. Permit issued this the 11 1" day of January , 2006. NORTH-AROLINA ENVIRONMENTAL MANAGEMENT COMMISSION for Alan W. Klimek, P.E., Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW8 051138 D-nn,m 7 of 0 State Stormwater Management Systems Permit No. SW8 051138 Eden Bridge Page 1 of 2 Stormwater Permit No. SW8 051138 Carteret 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 are a part of this Certification. Noted deviations from approved plans and specifications: Signature Registration Number Date SEAL Paris R of Q State Stormwater Management Systems Permit No. SW8 051138 Certification Requirements: Page 2 of 2 .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. 8. 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. Ali required design depths are provided. 14. All required parts of the system are provided, such as a vegetated shelf, a forebay, and the vegetated filter. 15. The required dimensions of the system are provided, per the approved plan. cc: NCDENR-DWQ Regional Office Katrina Marshall, Carteret County Building Inspections Paria 0 r%f 0 I OFFICE USE ONLY Date Received Fee Paid Permit Number C c= b s 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): Eden Bridge LLC 2. Print Owner/Signin Official's name and title (person legally responsible for facility and compliance): Keith Walker, r n.. , oir,—OF FoEAf s[z1hcE of toy eel h G ti /NC. MAsSAQv%Z- NEM-1&er. Of: EbEN '%iztbE►E LL-C, 3. Mailing Address for person listed in item 2 above: 315 Turner Street City: Beaufort State: N.C. Zip: 28516 Telephone Number: ( 252 504-3996 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Eden Bridge Subdivision 5. Location of Project (street address): Brooks Street City: Morehead City, North Carolina County: Carteret 6. Directions to project (from nearest major intersection): From the intersection of U.S. Hwy 70and N.C. 24, take the Bridges Street. Go approximently three miles Ck,,,, te4 L, tPal- 6r4 ctt yelrl.y goats Ve F,a.PA 7. Latitude: N 34A - 43' Longitude. W 76A - 45' of project 8. Contact person who can answer questions about the project: Name: Ronald D. Cullipher Telephone Number: ( 252 ] 247-7479 II. PERMIT INFORMATION: 1. Specify whether project is (check one) ✓ New Form SWU-101 Version 399 Page 1 of 4 Renewal Modification r 2. If this application is being submitted as the result or 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 ✓ High Density Redevelop Cencral Permit Other 4. Additional Project Requirements (check applicable blanks): CAMA Major ✓ 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 sheet flow to area drop inlets before being piped to the proposed stormwater pond. k1 � O--'F C�- 2. Stormwater runoff from this project drains to the KlCW PQ&M ?N L'R River basin. 3. Total Project Area: 6.767 acres 4. Project Built Upon Area: 66.38 5. How many drainage areas does the project have? 3 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 it 2_ Drainage Area to , 3 Receiving Stream Name Calico Creek eAIICd CreeV Receiving Stream Class SC S C S G Drainage Area 107,591.00 Existing Impervious* Area 0 Proposed Impervious*Area 58,054.00 8 1r 43 as % Impervious* Area (total) 53.96% '% 8.9.3010 S9- �Zo Impervious* Surface Area Drainage Area I Drainage Area 2 On -site Buildings 19739 u"" -Q nTZ t On -site Streets. 0 A9 0 17 dui On -site Parking 34,310 V On -site Sidewalks 4,005 3q 93 Other on -site 0 ado Oft' -site 0 91 Total: 58,054.00 Total: y3 aa' * 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 4 r.;Vgc- LoT 3 b%u; 6Y7WSd0 rJS 7. How was the off -site impervious area listed above derived? NIA 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 as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. Lor 2 , 90°lo 1-4P 66, 0&6 sr Ler 3 r 80" 1-fP 18191Z sr 2. No more than square feet of any lot all 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 ofswimming 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 tire stormwater control system shall he 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 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 (71�c • One copy of the applicable Supplement Form(s) for each BMP t?'AC' • Permit application processing fee of $420 (payable to NCDENR) pC' • 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) Mailing Address: 151-A Hwy 24 City: Morehead City Phone: ( 252 ) 247-7479 Stroud Engineering, P.A. VIII. APPLICANT'S CERTIFICATION State: NC Zip: Fax: ( 252 ) 247-4098 28557 I, (print or type nante of person fisted in General Information, item 2) Keith Walker, President certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project ill be constr ted in conformance with the approved plans, that the required deed restrictions and protective enantis will b recorded, and that the proposed project complies with the requirements of 15A ntr n r �u s n n jjjjjj Signature: Form SWU-101 Version 3.99 Page 4 of 4 � l3 0� Date: I 1 Permit No. 5tJF 3 5i )3y (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. 1. PROJECT INFORMATION Project Name: Eden Bridge Subdivision Contact Person: Keith Walker Phone Number: (252 ) 504-3996 For projects with multiple basins, specify which basin this worksheet applies to: Pond No. 1 elevations Basin Bottom Elevation Permanent Pool Elevation Temporary Pool Elevation areas Permanent Pool Surface Area Drainage Area Impervious Area volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DAI Diameter of Orifice Design Rainfall Design TSS Removal 2 8.0 ft. (floor of the basin) 13.0' ft. (elevation of the orifice) 14.0' ft. (elevation of the discharge structure overflow) 5882 sq. fit. (water surface area at the orifice elevation) 2.47 ac. (on -site and off -site drainage to the basin) 1.33 ac. (on -site and off -site drainage to the basin) 12,109 cu. ft. (combined volume of main basin and forebay) 6,941 cu. ft. (volume detained above the permanent pool) 3,029 cu. ft. (approximately 20% of total volume) 3.90 (surface area to drainage area ratio from DWQ table) 1.25 in. (2 to 5 day temporary pool draw -down required) 1.0 IIl. 90.0 % (minimum 85°o required) Form SWU-102 Rev 3.99 Page I of 4 Fr) ntnntPc- 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 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. H. 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 21­1 .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below. If a requirement has not been met, attach justification. Applicants Initials a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). �L bC b. The forebay volume is approximately equal to 20% of the basin volume. Z� C c. The temporary pool controls runoff from the design storm event. d. The temporary pool draws down in 2 to 5 days. fJ �A e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) �DC 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. -26Q h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). P_t6C i. Vegetative cover above the permanent pool elevation is specified. YaC' j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. �aC 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. Zt`Y.. 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 Vdoesnot incorporate a vegetated filter at the outlet. This system (check one) 0 does does not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3.99 Page 2 of Maintenance activities shall be performed as follows: 1. After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads �� feet in the main pond, the sediment shall be removed. When the permanent pool depth reads *Ufeet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) 0 Permanent Pool Elevation 13•0 Sediment RVoval�'75 0--- Sediment Removal Elevation 9�75% tiottam g o �,�-----------zs�io-- -------------------------------- Bottom Elevation FOREBAY MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-102 Rev 3.99 Page 3 of 4 7. All components of the wet detention basin system shall be maintained in good working order. I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: Title: Addre� Phone: Signati Date: la f o92A0-5- of EDUN Za-.bGe �aus,N or Nor 4104o C. N �e Q paµber OF' tr LC— ya I&IjuC,a L 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. 1, L,- W 0 CA i\q F , a Notary Public for the State of �)ll 07 t,-1 C (a izyc I n ck., County of CQ. A � , 0 e r, , do hereby certify that fte , - W e) kc.2 personally appeared before me this _g day of Jpps, and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, ��� ...,..... Oti •,� A, ;92 . •m- L SEAL My commission expires o12L 2Y, Form S W U-102 Rev 3.99 Page 4 of 4 Permit No. S c-)SoS l 13 8 (to he provided by DTVQ) 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 he photocopied for use as an original DWQ Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. 1. PROJECT INFORMATION Proiect Name: Eden Bridge Subdivision Contact Person: Keith Walker Phone Number: 252 For projects with multiple basins, specify which basin this worksheet applies to:. elevations Basin Bottom Elevation Permanent Pool Elevation Temporary Pool Elevation areas Permanent Pool Surface Area Drainage Area Impervious Area volumes Permanent Pool Volume Temporary Pool Volume E~orebay Volume Other parameters SAIDAI Diameter of Orifice Design Rainfall Design TSS Removal 2 504-3996 Pond No. 2 TO ft. (floor of the basin) 13.0 ft. (elevation of the orifice) 14.0 ft. (elevation of the discharge structure overflow) 6,375 sq. ft. (water surface area at the orifice elevation) 2.54 ac. (on -site and off -site drainage to the basin) 2.00 ac. (on -site and off -site drainage to the basin) 15,469 cu. ft, (combined volume of main basin and forebay) 7,429 cu. ft. (volume detained above the permanent pool) 3,005 cu. ft. (approximately 20% of total volume) 4.66% (surface area to drainage area ratio from DWQ table) 1.25 in. (2 to 5 day temporary pool draw -down required) 1.0 in. 90.0 % (minimum 85% required) Form SWU-102 Rev 3.99 Page I of 4 Footnotes: When using the Division SA/DA 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 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 .1009. 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 �bC' a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). _Ie1,Q b. The forebay volume is approximately equal to 20% of the basin volume. t2b C c. The temporary pool controls runoff from the design storm event. ii7bC d. The temporary pool draws down in 2 to 5 days. Qlk e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) P. AC f. The basin length to width ratio is greater than 3:1. 1?-b C g. The basin side slopes above the permanent pool are no steeper than 3:1. 2"k,e h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). 2pc i. Vegetative cover above the permanent pool elevation is specified. 2t�C J. A trash rack or similar device is provided for both the overflow and orifice. Z1�0_ k. A recorded drainage easement is provided for each basin including access to nearest right- �W of -way. 1. If the basin is used foi: 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. 111. 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) 0 does ]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 3 -%- feet in the main pond, the sediment shall be removed. When the permanent pool depth reads o7-a- feet in the forebay, the sediment shall be removed. BASIN DiACRAM (fill in the 81cinks) Permanent Pool Elevation I .D Sediment Re oval El. 10.`�S 75 o _______________ __ Sediment Removal Elevation 8.5-0 75% Bottom Ele anon ------------------------------------------------ ------ Bottom Elevation q•I} 25% j FOREBAY MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. if the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-102 Rev 3.99 Page 3 of 4 7. All components of the wet detention basin system shall be maintained in good working order. I acknowledge and agree by my signature below that I am responsible for the perfonnance 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 parry. Print Title: Address: i 5 t URiJ C a Z)Trzpe ; Phon Sign; Date Me-Mata oF1 Riac,ig u-C Jl Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I, J�-� �E1<i ,l. /—/,),t )-An/ C- , a Notary Public for the State of "'j County of e z g vtnl , do hereby certify that lle'rd /) . Ui44I1-t?2 personally appeared before me this .7L day of tbprenyR cg� 40 s , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seat, ��11/Ilffl// M0 •s. �.9L�� •......••'� �' , ZI � SEAL My commission expires Ocr C� 14 zor Form SWU-102 Rev 3.99 Page 4 of Permit No. C LD8 0 5/2:? (lobe provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWQ Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. 1. PROJECT INFORMATION Project Name: Eden Bridge Subdivision Contact Person: Keith Walker Phone Number: (252 ) 504-3996 For projects with multiple basins, specify which basin this worksheet applies to: Pond No. 3 elevations Basin Bottom Elevation 9.20 ft. (floor of the basin) Permanent Pool Elevation 13.20 ft. (elevation of the orifice) Temporary Pool Elevation 14.20 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 3,850 sq. ft. (water surface area at the orifice elevation) Drainage Area 1.75 ac. (on -site and off -rite drainage to the basin) Impervious Area 0.99 ac. (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 6,519 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 4,645 cu. ft. (volume detained above the permanent pool) Forebay Volume 1,301 cu. ft. (approximately 20% of total volume) Other parameters SAIDAI 5.00% (surface area to drainage area ratio from DWQ table) Diameter of Orifice 1.00 in. (2 to 5 day temporary pool draw -down required) Design Rainfall 1.0 in. Design TSS Removal 2 90.0 % (minimum 85% required) Form S WU-102 Rev 3.99 Page I of 4 Footnotes: When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non- standard table entries. 2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal. 11. R.EQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Flealth 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 -?AC a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). ;Ohe b. The forebay volume is approximately equal to 20% of the basin volume. _FA0 c. The temporary pool controls runoff from the design storm event, k2b0 d. The temporary pool draws down in 2 to 5 days. A4 e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) Pd C f. The basin length to width ratio is greater than 3:1. 71X' g. The basin side slopes above the permanent pool are no steeper than 3:1. 12160 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. PU7 j. A trash rack or similar device is provided for both the overflow and orifice. �dC3 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. I bC m. A mechanism is specified which will drain the basin for maintenance or an emergency. 111. 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) 0 does does not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3.99 Page 2 of Maintenance activities shall be performed as follows: l . 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 3.0 ' feet in the main pond, the sediment shall be removed. When the permanent pool depth reads AaSl feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blonks) Permanent Pool Elevation 13,dO Sediment Ren oval El. f�c q j'' ' 75 ° ____-______. _ Sediment Removal Elevation i*� Z� 75% Bottom Ele ation rf • .c90 % -------------------------'- Bottom Elevation-9-ad 25% FOREBAY MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-102 Rev 3.99 Page 3 of 4 7. All components of the wet detention basin system shall be maintained in good working order. 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: 1 [C'R_. f / Title:_ � 1 e- D FDEn1 �¢d rc'Itocrs..,+� DG/�o/e%tcaca�C.� f MA�IA�t�t. Met�tBER OF cnJBMc 1 Address: 31 rznlC�2 STD . �oAU6�RT Ale --21f J Phone: Signatt Date: la,Laa lof 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. 1, H A ; r� CQ U H o4an,1 V , a Notary Public for the State of Ooe4 Cp,ZQ L t n c-, County of (V-AVe,-j , do hereby certify that �e, personally appeared before me this J,91-�) day of Np(le bar ems- , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, �uuu 440 i�0""/I/ CO 141 " SEAL My commission expires 4-7-- C9�, SOU ?- Form SWU-102 Rev 3.99 Page 4 of 4