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HomeMy WebLinkAboutSW8020302_CURRENT PERMIT_20020628STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SWAOAX��__ DOC TYPECURRENT PERMIT APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMMDD Michael F. Easley, Govemor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources - - - - - -__-_ -- �- --�- Alan'W:-Klimek' P.E., -Directof — - - Division of Water Quality Wilmington Regional Office June 28, 2002 Mr�lldilliam-Grathwol-President Coastal Carolina Developers, Inc. PO Box 3403 Wilmington, NC 28406 Subject: Permit No. SW8 020302 Courtney Pines Phase II High Density Subdivision Stormwater Project New Hanover County Dear Mr. Grathwol: The Wilmington Regional Office received a complete Stormwater Management Permit Application for Courtney Pines Phase 11 on June 26, 2002. 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 020302, dated June 28, 2002, for the construction of the project, Courtney Pines Phase II. This permit shall be effective from the date of issuance until June 28, 2012, 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 Noelle Lutheran, or me at (910) 395-3900. Sincerely, r Rick Shiver f Water Quality Regional Supervisor RSS/:nml S:1WQSISTORMWATIPERMIT1020302 cc: Charles Cazier Tony Roberts, New Hanover County Inspections' Beth E. Wetherill, New Hanover County Engineering Division of Coastal Management Noelle Lutheran Wilmington Regional Office Central Files NCt EUR N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 (910) 395-3900 Fax (910) 350-2004 Customer Service 800-623-7748 State Stormwater Management Systems Permit No. SW8 020302 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 Coastal Carolina Developers,.lnc. Courtney Pines Phase-ll New Hanover County 601"H construction, operation and maintenance of three 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 June 28, 2012 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 3 of this permit, the Project Data Sheet. The subdivision is permitted for 57 lots, each allowed 3,500 square feet of built -upon area. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 4. This pond must be operated with a 30' vegetated filter.' 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. 2 State Stormwater Management Systems' Permit No. SW8 020302 DBIISION OF WATER QUALITY —PROJECT DATA SHEET Project Name: Courtney Pines Phase 11 Permit Number: SW8 020302 New Hanover -County Applicant: Mr. William Grathwol, President Mailing Address: Coastal Carolina_ Developers, Inc. PO Box 3403 ' Wilmington, NC 28406 Application Date: June 26, 2002 Name of Receiving Stream / Index 4: Smith Creek / 18-74-63 Classification of Water Body: "C Sw" Design Storm: l inch Pond A Pond B Pond Depth, feet: 5.5 5 Permanent Pool Elevation, FMSL: 35 35 Drainage Area, acres: 7.13 6.97 Total Impervious Surfaces, ft2: 114,089 90,351 57 lots at 3,500 ft2: 84,000 `'. ''' '59,500 Roads/Parking, ft2 30,089: , . 30,815 Offsite Area entering Pond, ft2: none, per'Engineer Required Surface Area, ftz: 7,202 6,683 Provided Surface Area, ft2: 8,095 7,626 Required Storage Volume, ft3: 12,780 11,086 Provided Storage Volume, W: 14,654 11,818 Temporary Storage Elevation, FMSL: 36.6 36.35 Controlling Orifice: 1.5" cp pipe 1.5" T pipe Pond C 5.5 36 5.38 82,073 56,000 26,073 5,152 6,173 9,374 10,074 37.35 1.25" y pipe J 3 State Stormwater Management Systems Permit No. SW8 020302 II. SCHEDULE OF COMPLIANCE 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. 2. 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.arearOnce 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. 3. If an Architectural Review Committee (ARC) 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 ARC do not relieve the homeowner of the responsibility to maintain compliance with the permitted BUA limit. 4. 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 Iisted below-, -. 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, acquisition, or sale of tFie project area. The project area is defined as all property owned by the permittee, for.which Sedimentation and Erosion Control Plan approval was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 5. 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. 7. The stormwater management system shall be constructed in it's entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface: 8. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 9. 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. 10. 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. 4 State Stormwater Management Systems Permit No. SW8 020302 11. Decorative spray fountains will not be allowed in the stormwater treatment system. 12. Permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 13. The permittee shall at all times provide the operation and maintenance necessary -to assure .______.-_.--that-all-component s-of the permitted-stormwater system furicfion at aptimum 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. 14. 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. 15. Prior to the sale of any lot, deed restrictions must be recorded which limit the built -upon area per lot to the amount as shown on the Project Data Sheet, per Section 1, Part 2. The recorded statements must follow the form: a. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number SW8 020302, 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 Storrnwater Management Permit. . C. These covenants are to run with the land and 15e 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 3,500 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. Lots within CAMA's Area of Environmental Concern may be subject to a reduction in their allowable built -upon area due to CAMA regulations. h. All runoff 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 naturally drain into the system are not required to provide these measures. 5 - State IStormwater Management Systems r.. Permit No. SW8 020302 16. Prior to transfer of the permit, the pond must be inspected by DWQ personnel, and _ _determined to.be.in compliancewith all.permit conditions. Any items not incompliance must -` be repaired or replaced to design condition prior to the.transfer. Records of maintenance activities performed to date will be required. 17. 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 bear the sibnature_of.the_Perm_ ittee,.the.deed.book -number_and_page,-and-stamp/signature-of-the- Register of of. 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. III. GENERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director. In the event there is 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, including as may be required, but not limited to, a deed of trust, recorded 'deed restrictions, Designer's Certification and a signed Operation and Maintenance'plari. 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 the terms and conditions of this permit until such time as the permit is reissued by the State to another responsible party. 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 reissuarice'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. no State Stormwater Management Systems, Permit No. SW8 020302 9. A copy of the approved plans and specifications shall be maintained on file by the Permittee — - for a minimum often years from the date of the completion of construction. Permit issued this the 28th day of June, 2002. _..._.-.--_..-_._--.-.-..----NORTH-CAROLINA ENVIRONMENTAL�MANAGEMENT-COMMISSION -- Alan W. Klime,PP.E., Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SWS 020302 7 0 Cow-tney Pines Phase I1 Stormwater Permit No. SW8 020302New Hanover County Designer's Certification State Stormwater Management Systems Permit No. SW8 020302 - - - - - - - Page I of 2 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 0 State Stormwater Management Systems, Permit No. SW8 020302 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. The outletJbypass structure elevations are per the approved plan. 5. The outlet structure is located per the approved plans. 6. Trash rack is provided on the outlet/bypass structure. 7. All slopes are grassed with permanent vegetation. 8. Vegetated slopes are no steeper than 3:1. 9. The inlets are located per the approved plans and do not cause short-circuiting of the System. l0. The permitted amounts of surface area and/or volume have been provided. 1 l . Required drawdown devices are correctly sized per the approved plans. 12. All required design depths are provided. ` �13. All required parts of the system are provided, such as a vegetated shelf, a forebay, and the vegetated filter. 14. The overall dimensions of the system, as shown on the approved.plans, are provided. CC.' NCDENR-DWQ Regional Office Tony Roberts, New Hanover County Building Inspections . ....ry :•.`,l.n:,:.v:.�:, ^� :1....v rvtiQ::{ rp :.. Date.Received Fee Paid Permit Number .S , 'L UD i+ L e6 . - / U D. I State of North Carolina Department of Environment and Natural Resources Division of Water Quality _'___--`—`_'STORMWATER MANAGEMENT PERMIT APPLICATIONTORIVI 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): Coastal Carolina Developers, Inc. 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): William Grathwol / President 3. Mailing Address for person listed in item 2 above: P.O. Boa 3403 City: Wilmington State: NC Zip: 28406 Telephone Number: 910-762-8316 4. Project Name (subdivision, facility, or establishment name —should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Courtnev Pines Phase II 5. Location of Project (street address): intersection of Maple Ridge and Rabbit Hollow City: ^ Wilmington County: New Hanover 6. Directions to project (from nearest major intersection): From the intersection of NCHwv 17 & Gordon Road travel west on Gordon Road to the intersection with . White Road. Turn right on White Road for approl._ 3.5miles. Site will be just.past Rabbit Hollow an left. 7. Latitude : N 34" 17' 30" Longitude: W 770 49' 15" of project 8. Contact person who can answer questions about the project: Name: Charles D. Cazier Telephone Number: 910-763-5100 II. PERMIT INFORMATION: 1. Specif}, whether project is (check one): X New Renewal Modification Form SWU-101 Version 3.99 Page 1 of 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). Lo,kv Density X High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): I _ __CAMA Major_ -X--Sedimentatioii/Erosioii-GoiitroI - - --404//401 -Permit -----NPDES Stormwater-­ Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6749. Ill. PROJECT INFORMATION 1. In the space provided below, summarize ho,,N, stonnwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. treated in three separate wet detention poonds 2. Stormwater runoff from this project drains to the —Cape Fear River basin. I Total Project Area: 19.49 acres 4. Project Built Upon Area: 33,75 03 — 5. How many drainage basins 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. ... ..... Receiving Stream Name Smith Creek Smith Creek Smith Creek Smith Creek Receiving Stream Class C-SW C-SW C-SW C-SW Drainage Basin Area 19,49 ac 7.13 ac 6.97 ac 5.38 ac E-.\'st'nc, Impervious Area - Proposed Inipenlous Area 6.58 ac 2.62 ac 2.07 ac 1.88 ac % Impervious* Area (total) 33,75% 36.75% 29.7% 35.0% t On -site Buildings 199,500 sf 94,000 sf 59,500 sf 56,000 sf On -site Streets 87,013 sf 30,089 sf 30,815 sf 26,073 sf On -site Parking On -site Sidewalks Other on -site Off -site - Total: Z=286,513 sf E=I 14,089 sf Y-=90,351 sf 82,073 sf * 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 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 allo,.able.built-upon area for -each lot -must be provided as an - -w attachment. 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. 2. No more than square feet of any lot shall be covered by structures of impemous 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 mod cation prior to construction. 5. All permitted runofffrom 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 certif}, 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 (910) 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 399 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 Iisted 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. Applicant's Initials • Original and one cop)' of the Stormwater Management Permit Application Form try. _ • One copy of the applicable Supplement Form(s) for each BMP G. L_ • Permit application processing fee of $420 (payable to NCDENR) C42t • Detailed narrative description of stormwater treatment/management • Two copies of plans and specifications, including: _G.QC - Development/Project name - Engineer and firm - Legend - North arrow - Scale - Revision number and date - Mean high waterline - 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): Tripp Engineering. P.C. _ Mailing Address: 419 Chestnut Street City: Wilmin0on _ State: NC, Zip: 28401 Phone: (910) 763-5100 Fax: (910) 763-5631 VIII. APPLICANT'S CERTIFICATION I. (print or type name of person listed in General Information, item ?) William Grathwol 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 1 5A NCAC 214.1000. Signature: /�//�/ ' - — ��� � Date: G � Form SWU-101 Version 3.99 Page 4 of 4 Permit. No. Q Z0 3 0 L (to be provided by DYi,OJ 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 phniocopied for use as an original DWQ Stormwater Management Plan Review: A complete Stormwater management plan submittal includes a wet detention basin supplement for each basin, design calculations, plans and specifications showing all basin and outlet structure details, and a signed and notarized operation and maintenance agreement. 1. PROJECT INFORMATION (please complete the following information): Project Name: Courtney Pines Phase II Contact Person: Charles D. Cazier Phone Number: 910 763-5100 For projects with multiple basins, specify which basin this worksheet applies to; 2 elevations Basin Bottom Elevation 29.5 ft. (floor of the basin) Permanent Pool Elevation 35.0 ft. (elevation of the orifice) Temporary Pool Elevation 36.6 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area ____8 095_ sq,ft. (water surface area at the orifice elevation) Drainage Area 7.13 ac. (on -site and off -site drainage to the basin) Impervious Area 2.62 ac. (on -site and off -.site drainage to the basin) volumes Permanent Pool Volume 25,611_ cu.ft. (combined volume of main basin aizd forehciv) Temporary Pool Volume _14,654_ cu.ft. (volume detained above the permanent pool) Forebay Volume _ 4,959� cu.ft. (approximately 20% of total volume) Other parameters SAIDA' 2.32 (surface area to drainage area ratio, from DWO table) Diameter of Orifice 1.5 in. (2 to 5 day tempormy pool draw -down required) Design Rainfall 1.0 in. Design TSS Remova12 90 % (minimuni 85% required) Form SWU-102 Rev 3.99 Page 1 of 4 _ -ram Footnotes: 1. 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. _ 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 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 LZY1 a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). qY- b. The forebay volume is approximately equal to 20% of the total basin volume. C c. The temporary pool controls runoff from the design storm event. Cam- d. The temporary pool draws down in 2 to 5 days. WA e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations). f. The basin length to width ratio is greater than 3:1. g. The basin side slopes above the permanent pool are no steeper than. 3:1. Clz_ h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). C i. Vegetative cover above the permanent pool elevation is specified. Cfx_ _^ J. A trash rack or similar device is provided for both the overflow and orifice. of Lam_ k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. C 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified to be performed prior to use as a wet detention basin 66 m. A mechanism is specified which will drain the basin for maintenance or an emergency. M. 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) ❑ does X does not incorporate a vegetated filter at the outlet. This system (check one) ❑ does X does not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3.99 _ Page 2 of 4 A& Maintenance activities shall be performed as follows- 1. After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention 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 not be handled in a manner that will 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 4.125_ feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 2.25_ feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 35.0 Sediment moval EL 32.75 75 /� _�32 Sediment Removal Elevation 30.875 75% Bottom eva4 -------------------------------------------�-_--- -_-_ Bottom Elevation 29.5 25°/ FOREBAY MA[NjPOND 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 possible. 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: Mr. William Grathwol - • Title:, . w- . -w-• --- President, Coastal Carolina Developers., Inc. - - - - — -- �- Address: 2905 Market St. Wilmington, NC 25403 Phone: 910-762-8316 J Signature: Date. 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, `Della C. Baird , a Notary Public for the State of North Carolina , County of Pender do hereby certify that William Grathwol personally appeared before me this IS day of _.Tanua ____, 2002___, and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, \\\``„+►u+arnrrrrr�f�i �' C. z�''� N0TAgr. o �r^2�, AVBL4G �•c�' 6Ol1,;�\\ rrrrrrin++�� SEAL My commission expires 10-15-06 /� eCFw. C. Bcuwf Farm SWU-102 Rev 3.99 Page 4 of 4 Permit No.c7 G off, (to be provided by Dbi"Q) - _ - _-.---State of.North Carolina._-_. Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM --w_ —WET DETENTION BASIN SUPPLEMENT Thisform.mav be photocopied for -use as an original DWO Stormwater Management Plan_ Review: A complete stormwater management plan submittal includes a wet detention basin supplement for each basin, design calculations, plans and specifications showing all basin and outlet structure details, and a signed and notarized operation and maintenance agreement. I. PROJECT INFORMATION (please complete the following information): Project Name: Courtnev Pines Phase 11 Contact Person: Charles D. Cazier Phone Number: 910 763-5100 For projects with multiple basins, specify which basin this worksheet applies to: 3 elevations Basin Bottom Elevation 30.0 ft. (floor of the basin) Permanent Pool Elevation 35.0 ft. (elevation of the orifice) Temporary Pool Elevation 36.35_ ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area ___7.626_ sq.ft. (water surface area at the orifice elevation) Drainage Area 6.97 ac. (on -site and off site drainage to the basin) Impervious Area 2.07 ac. (on -site and off -site drainage to the basin) volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DA' Diameter of Orifice Design Rainfall Design TS S Removal2 _22,072cu`.ft. (comhined volume of main basin and forebay) 1,818— cu.ft. (volume detained above the permanent pool) 4,314_ cd.ft. (approximately 20% of total volume) 2.20 (surface area to drainage area ratio from DWO table) 1.5 in. (2 to 5 day temporary pool draw -down required) 1.0 in. 90 % (minimum 85% required) Form SWU-102 Rev 3.99 Page 1 of 4 Footnotes: I . 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 BiV1P manual provides design tables for both 85% TSS removal and 90% TSS removal. U. 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 _lfmf a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). ll:;�L_ b. The forebay volume is approximately equal to 20% of the total basin volume. c. The temporary pool controls runoff from the design storm event. Grp d. The temporary pool draws down in 2 to 5 days. "A e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations). f. The basin length to width ratio is greater than 3:1. [fir g. The basin side slopes above the permanent pool are no steeper than 3:1. T�[1 h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). i. Vegetative cover above the permanent pool elevation is specified. J. A trash rack or similar device is provided for both the overflow and orifice. /-r3(_ T_ k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. Cf7C _T 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified to be performed prior to use as a wet detention basin Llr _ m. A mechanism is specified which will drain the basin for maintenance or an emergency. M. 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) ❑ does X does not incorporate a vegetated filter at the outlet. This system (check one) ❑ does X does not incorporate pretreatment other than a forebay. Farm SWU-102 Rev 3.99 Page 2 of 4 Maintenance activities shall be performed as follows: 1. After every significant runoff producing rainfall event and at least monthly: _ a. Inspect the wet detention 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 not be handled in a manner that will 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 2.25� feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 35.0 Sediment moval El. 32.75 75 /° kevation _____L2T-5% Sediment Removal Elevation 31.25 ----------------------------------------------42'�'_O!j Bottom Bottom Elevation 30.() / a 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 possible. 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: Mr. William Grathwol Title: _President, Coastal Carolina Dev6lopers,_Inc: _ Address: 2905 Market St. Wilmington, NC 28403 Phone: 910�-7,62833J 6 Signature: _ �Ul//�' /��: - ��i`�✓`' Date:�— Note-, Tile legally responsible party should not be a homeowners association unless more than 50'A of the lots have been sold and a resident of the subdivision has been named the president. _ I, Della C. Baird _ a Notary Public for the State of North Carolina , County of Pender , do hereby certify that William Grathwol personally appeared before me this - - , day of Janua 2002`, and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, My commission expires SEAL l 5-06 Nz- C. 6aak Form SWU-102 Rev 3.99 Page 4 of 4 Permit No. �J L� Za 30 Z_ (to be provided by DJYQ) _ State of North Carolina - -- - -- - - - - - ___ Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM 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 a wet detention basin supplement for each basin, design calculations, plans and specifications showing all basin and outlet structure details, and a signed and notarized operation and maintenance agreement. 1. PROJECT INFORMATION (please complete the following information): Project Name: Courtney Pines Phase I1 Contact Person: Charles D. Cazier Phone Number: 910 763-5 ] 00 For projects with multiple basins, specify which basin this worksheet applies to: 4 elevations Basin Bottom Elevation 30.5 ft. (floor of the basin) Permanent Pool Elevation 36.0 ft. (elevation of the orifice) Temporary Pool Elevation 37.35 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 6,173_ sq.ft. (water surface area at the orifice elevation) Drainage Area 5.38 ac. (on -site and off -site drainage to the basin) Impervious Area 3.88 ac. (on -site and of drainage to the basin) volumes Permanent Pool Volume 17,773_ cu.ft. (combined volunte of main basin and fore bay) r Temporary Pool Volume _10,074 cu.ft. (volume detained above the permanent pool) t Forebay Volume 33 46$_ cu.ft. (app•oximalelY 20910 of total volume) Other parameters SA/DA1 2.20 (surface area to drainage area ratio from DWO table) Diameter of Orifice 1.25 in. (2 to 5 day temporary pool draw -down required) Design Rainfall 1.0 in. Design TSS Removal2 90 % (minimum 85% required) Form SWU-102 Rek, 3.99 Page I of 4 Footnotes: 1. 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 «•aived if the wet detention basin is designed to provide 901%. TSS removal. The NCDENR BW manual provides design tables for both 85% TSS removal and 90% TSS removal. _11. __. -_REQUIRED_ ITEMS CHECKLIST..-_. The following -checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below. if a requirement has not been met, attach justification. Applicants Initials L a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). - b. The forebay volume is approximately equal to 20% of the total basin volume. c. The temporary pool controls runoff from the design storm event. Cr;�[_ d. The temporary pool draws down in 2 to 5 days, f 4A. e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow (�7C calculations). f. The basin length to width ratio is greater than 3:1. CIS g. The basin side slopes above the permanent pool are no steeper than 3:1. h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). CIaG i. Vegetative cover above the permanent pool elevation is specified. C j. A trash rack or similar device is provided for both the overflow and orifice. C Z 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 to be performed prior to use as a wet detention basin Cam- in. A mechanism is specified which will drain the basin for maintenance or an emergency. M. 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) ❑ does X does not incorporate a vegetated filter at the outlet. This system (check one) ❑ does X 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: 1. After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention 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 not be handled in a manner that will 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 4.125_ feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 2.25 feet in the forebay, the sediment shall be removed. Sediment moval El. 33.75 7 Bottom evation 33.0 4 FOREBAY BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 36.0 Sediment Removal Elevation 31.975 ------------------------------------- Bottom Elevation 30.5 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 possible. Form SWU-102 Rev 3.99 Page') of 4 7. All components of the wet detention basin system shall be maintained in good working order. - ----- 1 acknowledgeand 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: Mr. William Grathwol Title: - - - President, -,.Coastal -Carolina -Developers. -Inc.- Address: 2905 Market St. Wilmington, NC 29403 Phone- 910-762-9316 Signature: Date: —L Note: The legally responsible party should not be a homeoKmers association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, Della C. Baird _ a Notary Public for the State of North Carolina_____, County of Pender do hereby certify that William Grathwol personally appeared before me this I - day of _ 3anuary 2_ 002 , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal., C.6aDLk SEAL My commission expires 10-15-06 Form SWU-102 Rev 3.99 Page 4 of 4 Jan 07 2011 12:19 Wilson %26 Lysiak Inc. 336-275-2636 P.5 Project Name: Cov e �i 6S SUS t?1 V r 31&J Stormwater Permit o.: QM3030ig County: Q Oesig nett Certification 1,4uaP &LEkA4 40mNL[ , as a duly registered !'ESs AL- i,+.466G in the State of North Carolina. having been authorized to observe (periodicail)weehlyO -%**r e"he construcliioon of the project, eoOJ tI X-r i w�-t K,s.L c.00-4 �v i 8 t1 ZQ3oT. (Prom) for • ANuoA��y` _ _(Project Owner) hereby state thial., W the - egqk_kt �best of my abilities, due care and dligence was used in the observation of the project construction such that the construction was observed to be buRt within substantial compliance and Intent of the approved plans and specifications. The checklist of items on page 2 of thts form is included in the Certification. Noted deviations from approved plans and specification: t Signature Registratic Date `► �ti%lll11i��� SEAL r -b 17374 4 �y c .•' GR EGa llf 1h Jan 07 2011 12:19 Wilson %26 Lysiak Inc. Certification Requirements: ,_ i5 336-275-2636 The drainage area to the system contains approximately the permitted acreage. The drainage area to the system contains no more than the permitted amount of built -upon area. All the built -upon area associated with the project is graded such that the runoff drains to the system. All roof drains are located such that the runoff is directed into the system. The outiet1bypass structure elevations are per the approved plan. The outlet structure is located per the approved plans. Trash rack is provided on the outlet/bypass structure. All slopes are grassed Mth permanent vegetation. Vegetated slopes are no steeper than 3:1. The inlets are located per the approved plans and do not cause short- circuiting of the system, The permitted amounts of surface area andfor volume have been provided. Required drawdown devices are correctly sized per the approved plans. All required design depths are provided. All required parts of the system are provided, such as a vegetated shelf, and a forebay. The required system dimensions are provided per the approved plans. p.6 .... County Building InspecttlDn9._.. ..... _._.-. .�._.....,.....�......._......,._,,......_...,_,,�_.....-�.,.....-.,.._ { r 4 Project Name: CO��1e►J ES 5UP5 PI V I a I O&J Stormwater Permit)\l o_: S 64,7Q 3 0.?,�_ County: jgAA10V Designer's Certification I,fwP &It1�LfL�, as a duly registeredot^ESSJo+A�- in the State of North Carolina, having been authorized to observe (periodicalf�lf» the constructPPAE—A' on of the project, �Os1 pr�Y KAV4f i c wPA4 S\d 8 O Z030Z (Protect) for C.OAxl1�. 190"A (Project Owner) hereby state that, tv 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 Registratic Date ' 3NN o I Z01 =O•.•oFESSlpry.•��y�. SEAL, f = b{ 17374 = GREGO .� sa i��� jA �NGlNEF-�:••• ���� REC'D JAN 0 7 2011 1 t - Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage. _g,Z. 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. Regional.4ffice........ ....... ......_ _ ._._....,. � w _ _.,,�..._........... County Building Inspections