Loading...
HomeMy WebLinkAboutSW6070703_CURRENT PERMIT_20070911STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYMMDD I Michael F. Easley, Governor William G. Ross R., Secretary North Carolina Department of rnwomnent and Natural Resources y Coleco li. Sullins, Director Division of Water Quality September 11, 2007 Benjamin B. Slaughter PO Box 785 Fuquay-Varina, NC 27526 Subject: Storn»vater Management Permit SW6070703 McCullers Relo Facility High Density Project Harnett Countv Dear Mr. Slaughter The Fayetteville Regional Office of the Division of Water Quality received a Stormwater Management Permit Application for the McCullers Relo Facility project on July 30, 2007. Staff review of the plans and specifications and additional information received August 28, 2007 and September 5, 2007 has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 21-I .1000. Accordingly, we are forwarding herewith Stormwater Management Permit S W6070703, dated September I I. 2007, for the construction, operation and maintenance of stormwater treatment facilities associated with the subject project. This permit shall be effective from the date of issuance until September 10, 2017, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stonnwater management system will result in future compliance problems. If any parts, requirements, of limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) calendar days following receipt of this permit. ']'his 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 Mike Lawyer or myself at (910) 433-3300, Sincerely, d, Cl�riCtF-J J T�vL1lY1: Belinda S. Henson Regional Supervisor Surface Water Protection Section BS11: MUmI cc: John A. K. Tucker, PE Harnett County Planning & Inspections FRO -Surface Water Protection Water Quality Central Files NoiihCarolina Naturally North Carolina Division of Water Quality 225 Green Street -Suite 714 Fayetteville, NC 28301 Phone (910) 433-3300 Customer Service Internee www.nevateraualitv.or, Fax (910)486-0707 1-877-623-6748 An Equal Opportunity/Affirmative Action Employer —500% Recycledh0% Post Consumer Paper STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONNIENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORININVATER MANAGEMENT PERMIT UIGH 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 Benjamin B. Slaughter AkGullers Relo Facility Harnett County FOR THE construction, operation and maintenance of three (3) wet detention ponds in compliance with the Provisions of 15A NCAC 211 .1000 (hereal er 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 6f issuance until September 10, 2017, and shall be subject to the following specified conditions and limitations: L DESIGN STANDARDS I. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. The stormwater systems have beenapproved for the management of stonnwater runoff as described in Section 1.5 of this peririt. The stonnwater controls have been designed to handle the runoff from 2,529,529 square feet of impervious area. 3. All stomiwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The filial plats for the project will be recorded showing all such required easements, in accordance with the approved plans. 4 The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control systems. 5. The following design criteria have been provided in the wet detention ponds and must be maintained at design condition: Basin One- a. Drainage Area, acres: 39.1 Onsite1 ft�: 1,703,196 OffsiteI ft2: N/A b. Total Impervious Surfaces, ft': 343,757 i C. Design Storm, inches: 1 d. Pond Depth, feet: 4 e. TSS removal efficiency: 85% f. Permanent Pool Elevation, FMSL: 286 g. Permanent Pool Surface Area, W: 42,491 h. Permitted Storage Volume, W: 85,630 i. Temporary Storage 131evatio'n, FMSL: 287.9 j. Controlling Orifice: 4"0 pipe k. Permanent Pool Volume, f1': 134,244 1. Permitted Forebay VOIUme, If3: 26,966 M. Receiving Stream/River Basin: Hector Creek / Cape Fear n. Stream Index Number: 18-15-(0.7) 0. Classification of Water Body: "WS-IV;HQW" Basin Two: a. Drainage Area, acres: 21.3 Onsite, f 2: 927,828 0ffsite, fe: N/A b. Total Impervious Surfaces, ft": 749,232 C. Design Storm, inches: I d. Pond Depth, feet. 6 C. TSS removal efficiency: 85% f. Permanent Pool Elevation, FN4SL: 286 g. Permanent Pool Surface Area, fe: 28,722 h. Permitted Storage Volume, ft': 60,767 1. Temporary Storage Elevatiiiii, FMSL: 288 j. Controlling Orifice: 2.5"0 pipe k. Pernianent Pool Volume, fC': 90,753 1. Permitted Forebay Volume, 1,13: 24,784 In. Receiving Strearn/River Basin- Hector Creek / Cape Fear n. Stream Index Number: 18-15-(0 7) 0. Classification of Water Body: "WS-IV;HQW" Basin Three: a. Drainage Area, acres: 37.8 Onsite1 ft'`: 1,646,568 Offsite, ftl: N/A b. Total Impervious Surfaces, 11" 936,540 C. Design Storm, inches: 1 d. Pond Depth, feet: 6 e. TSS removal efficiency: 85°/� 1'. Permanent Pool Elevation. l,NISL: 292 g. Permanent Pool Surface Area; ft2: 39,245 h. Permitted Storage Volume, IV: 80,690 i. Temporary Storage Elevation, FNISL: 294 j. Controlling Orifice: 3 "O pipe k. Permanent Pool Volume, ft': 114,803 I. Permitted Forebay Volume;,, ftl: 24,967 In. Receiving Sneam/River Basin: Hector Creek / Cape Fear it. Stream Index Number: 18-I5-(0.7) o. Classification of Water Body: "WS-IV,HQW" 11. SCHEDULE OF COMPLIANCE The stormwater management systems shall be constructed in their entirety, vegetated and operational for their intended use prior to the construction of any built -upon surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The pennittee shall, at all times, provide the operation and maintenance necessary to assure the permitted stormwater systems function at optimum efficiency. The approved Operation and Maintenance Plan must be follower in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semi-annual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in {accordance with approved plans and specifications. f. Debris removal and unclogging of outlet structure, orifice device, flow spreader, catch basins and piping. g. Access to the outlet structu?c must be available at all times. Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken, 5. 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 tubinc, connects the nozzle, pump and intake, may be used only, if they draw water from the surface in the deepest part of the pond. c. The falling water from lire fountain must be centered in the pond, away from the shoreline. d. The maximum horsepower for a fountain in Basin One is 1 /2 horsepower, Basin Two is 1 /3 horsepower and Basin Three is 1 /3 horsepower. 6. The facilities shall be constructed as shown on the approved plans. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this pennitted facility,, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 8. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 9. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 10. The pennittee 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: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. C. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned by the permitter, for which Erosion and Sedimentation Control Plait approval or a LAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 1 ]. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 12. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. 13. The Director may notify the permit -I& 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 pennittee 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. Ill. CPNERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director. In the event. of a change of ownership, or a name change, the permitter must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. The permittee is responsible for compliance ),with all permit conditions until such time as the Division approves the transfer request. 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. 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) havingjurisdiction. 4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 5. The permittee grants DENR Staff permission to enter the property, during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility, 6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established iii the North Carolina Erosion and Sediment Control Planning and Design Manual. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit_ The permittee shall notify the Division with any name, ownership or mailing address changes within 30 calendar days. Permit issued this the eleventh day of September 2007. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Ale H. Sullms, Director Division of Water Quality By Authority of the Environmental Management Commission Permit SVV6070703 McCullers Relo Facility Page l of') Stormwater Management Permit SW6070703 Harnett County Designer's Certification I, as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for _ (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and §pecification: SEAL Signature Registration Number ...... Date Certification Requirements: Page 2 of 2 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the stem 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 sueh 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. & 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, forebay and vegetative filter. 15. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ Regional Office OFFICE USE ONLY Date Received Fee Paid Permit Number 7- 30-off ` 03 tE6d')oiO3 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 art original I c 1 L GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): IJI V1f Benjamin B Slaughter 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Benjamin B. Slaughter 3. Mailing Address for person listed in item 2 above: PO Box 785 City: Fuquay Varina State: NC Zip: 27526 Telephone Number: ( 919 ) 669-2700 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): McCullers Relo Facility 5. Location of Project (street address): US 401 North County: Harnett County 6. Directions to project (from nearest major intersection): From intersetion of US 401/421& NC 210 in Lillington proceed 7.6 miles north on US 401. Project is on the west side of US 401 7. Latitude: 35-30-51 Longitude: -78-48-04 8. Contact person who can answer questions about the project: John Tucker it. PERMIT INFORMATION: 1. Specify whether project is (check one): Telephone Number: ( 919 x New Renewal Form SWIJ-101 Version 3.99 Page I of of project 5670483 Modification 2� If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number and its issue date (if known) 3. Specify the type of project (check one): Low Density x High Density Redevelop _General Permit _Other 4. Additional Project Requirements (check applicable blanks): _CAMA Major x Sedimentation/Erosion Control _404/401 Permit x 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. First inch of stormwater will be collected in main intersecptor pipes and directed to 3 wet detention ponds. 2. Stormwater runoff from this project drains to the Cape Fear River basin. 3. Total Project Area: 96 acres 4. Project Built Upon Area: 61 % 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 1 Basin 2 Basin Information Drainage Area I Drainage Area 2 Receiving Stream Name Tributary to Hectors Creek Tributary to Hectors Creek Receiving Stream Class C'HQ C:HQ Drainage Area 39.10 21.30 ac Existing Impervious* Area 0 ac 0 Proposed Impervious*Area 21.50 ac 17.20 ac % Impervious# Area (total) 53 81 Impervious* Surface Area Drainage Area I Drainage Area 2 On -site Buildings NA NA On -site Streets NA NA On -site Parking 21.50 17.20 On -site Sidewalks NA NA Other on -site NA NA Off -site Total: 21.50 ac Total: 17.20 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 Basin 3 Basin Information Drainage Area I Drainage Area 2 Receiving Stream Name Trihuta[y to Hectors Greek Receiving Stream Class C;HQ Drainage Area 37.80 Existing Impervious" Area 0 ac Proposed Impervious`Area 21.50 ac % Impervious* Area (total) 56 Impervious' Surface Area Drainage Area I Drainage Area 2 On -site Buildings NA On -site Streets NA On -site Parking 21.50 On -site Sidewalks NA Other on -site NA Off -site Total: 21.50 ac Total: Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. 7. How was the off -site impervious area listed above derived? Review of aerial photograhpy (2005) and site recon. 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. 2. No more than square feet of any lot shall be covered by structures or impervious materials. Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood decking or the water surface of swimming pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. 4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction. 5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of 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 'ram - _ • One copy of the applicable Supplement Form(s) for each BMP • Permit application processing fee of $420 (payable to NCDENR) • fual- 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) VIL AGENT AUTHORIZATION If you wish to designate authority to another Individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm): John A.K. Tucker Mailing Address: PO Box 297 City Fuquay Varina State: NC Zip: 27526 Phone: ( 919 ) 5670483 Fax: ( 919 ) 5673611 Vill. APPLICANT'S CERTIFICATION I, (print or type name ofperson listed in General Information. item 2) 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 t proposed project complies with the requirements of 15A NCAC 2H .1000. If . Date: 7A f 0! Form SVAJ-101 Version 3.99 Page 4 of t; Permit No. S"676 7a 3 (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: McCullers Relo Contact Person: John Tucker Phone Number: ( 919 ) 567 0483 For projects with multiple basins, specify which basin this worksheet applies to: Basin 1 elevations Basin Bottom Elevation 282.00 ft. Permanent Pool Elevation 286.00 ft. Temporary Pool Elevation 287.90 fr. (floor of the basin) (elevation of the orifice) (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 42,491 sq. ft. (water surface area at the orifice elevation) Drainage Area 39.10 ac. (on -site and off site drainage to the basin) Impervious Area 2120 ac. (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 134,244 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 80,879 cu. ft. (volume detained above the permanent pool) Forebay Volume 26,966 cu. ft. (approximately 20% of total volume) Other parameters SA/DA1 1.92 (surface area to drainage area ratio from DWQ table) Diameter of Orifice 12 in. (2 to 5 day temporary pool draw -down required) Design Rainfall 1 in. Design TSS Removal 2 85 % (minimum 85%required) Form SWU-102 Rev 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 waived if the wet detention basin is designed to provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85%TSS removal and 90% TSS removal. II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 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). b. The forebay volume is approximately equal to 20% of the basin volume. c. The temporary pool controls runoff from the design storm event. d. The temporary pool draws down in 2 to 5 days. ye. 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. h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). /L 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. k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. A/14 I. 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. _ar in. 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) edoes 0 does not incorporate a vegetated filter at the outlet. This system (check one) 0 does 0 does not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3.99 Page 2 of Maintenance activities shall be performed as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 3.00 When the permanent pool depth reads 3.00 Sediment Re oval El. 283.00 Bottom Eleanon 282.00 FOREBAY feet in the main pond, the sediment shall be removed. feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blankv) Permanent Pool Elevation 286.00 Sediment Removal Elevation 283.00 47 0°- Bottom Elevation 282.00 25% 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. 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 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: Benjamin B. Address: PO Box 785 Fuquay Varina, NC 27526 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, Pac'( (+k 7Qar'ce, <JC-e ar a Notary Public for the State of lybrH- Cpr�J;na , County of JAja4b— do hereby certify that (Yn tm 6. personally appeared before me this cZs day of Jt, Sj Z00'I , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, / yeARCF \ j NOTARy o z G. '01JB0'J �,.yt O, COUN`'/ SEAL My commission expires ! 0'.2 (fl_ zoo,) Form S WU-102 Rev 3.99 Page 4 of 4 � f � N �.- .� :(l. Permit No. 514-126.2 63 (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. I. PROJECT INFORMATION Project Name: Contact Person McCullers Relo John Tucker Phone Number: (919 ) 5670483 For projects with multiple basins, specify which basin this worksheet applies to: Basin 2 elevations Basin Bottom Elevation 280.00 ft. Permanent Pool Elevation 286.00 ft. Temporary Pool Elevation 288.00 ft. (floor of the basin) (elevation of the orifice) (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 28,722 sq. ft. (water surface area at the orifice elevation) Drainage Area 21.3 ac. (on -site and off -site drainage to the basin) Impervious Area 17.20 ac. (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 90,753 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 60,767 cu. ft. (volume detained above the permanent pooh Forebay Volume 24,784 cu. ft. (approximately 20% of total volume) Other parameters SA/DAI 2.39 (surface area to drainage area ratio from DWQ table) Diameter of Orifice 12 in. (2 to 5 day temporary pool draw -down required) Design Rainfall 1 in. Design TSS Removal 2 85 % (minimum 85% required) Form SWU-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. 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. Ill. 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 21-1 .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). b. The forebay volume is approximately equal to 20% of the basin volume. T c. The temporary pool controls runoff from the design storm event. d. The temporary pool draws down in 2 to 5 days. 9 c. 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. ipy 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. 4 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. 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. -fir 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) 6 d s 0 does not incorporate a vegetated filter at the outlet. This system (check one) s 0 does not incorporate pretreatment other than a forebay. Form S WU-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 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. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 4.50 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 4.50 feet in the forebay, the sediment shall be removed. Sediment Rcn oval El. 281.50 -------------- Bottom Elc ation 2B0.00 FOREBAY BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 286.00 Sediment Removal Elevation 281 _50 - Bottom Elevation 280.00 MAIN POND 175% -- -25% 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 of4 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: Benjamin B. Slaughter Title: Owner Address: PO Box 785 Fuquay Varina, NC 27526 Date: o Note: The legally responsible party should not be a homeowners association unless more than 5,0% of the lots have been sold and a resident of the subdivision has been named the president. 1, PaLdef+c Pearce. Ja6f�V'n' , a Notary Public for the State of Noy^'q-t C¢ra u/wk , County of _ wa kc -,do hereby certify that drpp arn;-n 6. S�acwl„te.� personally appeared before me this a` day of fjr(tI _too 1 and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, PEAROF\\ dv NOT AFi'y 9� � A(/BLIG 2 \cout4v'" SEAL My commission expires lid• 3Lfo - -)-ODq Form SWU-102 Rev 3.99 Page 4 of 4 Penn it No. 5' 16o'%o 70 3 (to he 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. I. PROJECT INFORMATION Project Name: McCullers Relo Facility Contact Person: John Tucker Phone Number: ( 919 ) 567 0483 For projects with multiple basins, specify which basin this worksheet applies to: Basin 3 elevations Basin Bottom Elevation 286.00 ft. Permanent Pool Elevation 292.00 ft. Temporary Pool Elevation 293.85 ft. (floor of the basin) (elevation of the orifice) (elevation of the discharge structure ovetflow) areas Permanent Pool Surface Area 39,245 sq. ft. (water surface area at the orifice elevation) Drainage Area 37.80 ac. (on -site and off -site drainage to the basin) Impervious Area 21.50 ac. (on -site and off -site drainage to the basin) volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DA I Diameter of Orifice Design Rainfall Design TSS Removal 2 114,803 cu. ft. (combined volume of main basin and forebay) 80,690 cu. ft. (volume detained above the permanent pool) 24,967 cu. ft. (approximately 200% of total volume) 1.58 (surface area to drainage area ratio from DWQ table) 12 in. (2 to 5 day temporary pool draw -down required) 1 in. 85 % (minimum 85%required) Form SWU-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 fitter 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 21-1 .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). b. The forebay volume is approximately equal to 20% of the basin volume. c. The temporary pool controls runoff from the design storm event. d. The temporary pool draws down in 2 to 5 days. c. 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. It. 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. 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. 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) 9fdoes 0 does not incorporate a vegetated filter at the outlet. This system (check one) 94oes 0 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. 1 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 450 When the permanent pool depth reads 4.50 feet in the main pond, the sediment shall be removed. feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation 292 Sediment Re oval El. 287.50 175 ° __________♦__ Sediment Removal Elevation 28750 Bottom Elc ation 286.00 % "---------------------------------- Bottom Elevation 286.00 FOREBAY MAIN POND 75% 25% 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 ol'4 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: Benjamin B. Slaughter Address: PO Box 785 Fuquay Varina, NC 27526 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, rai-jcf e r eay e— jr-,dCSoo , a Notary Public for the State of / oYA Qa it County of jb�(L� t° do hereby certify that 46P-'l�OM .Ix 6- 51aVA$ h 4-e� personally appeared before me this ..� day of J "kl and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, /�pEARCE V NOTARY u, Q — O a AVBI.�G z 9 V COUtJT'I'� SEAL My commission expires 10 - k , "w 0% Form SWU-102 Rev 3.99 Page 4 of 4 r Permit No. (to he provided by DW0) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT FL'S 2u8% This form may be photocopied for use as an original DWO Stonnwater Management Nan Review: ®WQ 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: McCullers Relo F Contact Person: John Tucker For projects with multiple basins. elevctlians Phone Number. (919 ) 5670483 fy which basin this woiksheet applies to: Basin 1 Basin Bottom Elevation 282.00 g. Permanent Pool Elevation 286.00 ft. Temporary Pool Elevation 287.90 ft. areas Permanent Pool Surface Area 42,491 sq. ft. Drainage Area 39.10 ac. Impervious Area 19.37 ac. (floor q/ the basin) (elevation ofthe orifice) (elevation oflhe discharge structure overflow) (water sau,face area at the orifice elevation) (on -site and oJJ-site drainage to the basin) (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 134,244 cu. ft. (combined volume ofinain basin andforebay) Temporary Pool Volume 85,630 cu. ft. (volume detained above the perwianent pool) Forebay Volume 26,966 cu. ft. (approximately 20% of total volume) Other parameters SA/DAJ 173 Diameter of Orifice 4 n. Design Rainfall 1 n. Design TSS Removal 2 85 % (sun face urea to drainage area ratio fi orn DNVQ table) (2 to 5 day temporary pool draw -down required) (minimum 85%required) Form SWU-102 Rev 3.99 i Page I of 4 r Pond Number Sheet 1 of 2 1.00 Depth of Runoff, inches 85630 Volume of Runoff, cf 1.9 Depth of Temp Pool, feet I 60 Desired Computational Interval, minutes 286.0 Starting Water Surface Elev. 287.9 Water Elevation 292.0 Top of Dam Initial Discharge Discharge at 2 days Discharge at 5 days Storage. Inc. Time, min. c1 Stage. It 0 0 85630 1.9 1 so 83642 1.8 2 120 81687 1.8 3 180 79755 1.a 4 240 77847 1.7 5 300 75963 1.7 6 360 74102 1.6 7 420 72265 1.6 8 480 70451 1,6 9 540 68662 1.5 10 600 6b695 1.5 11 560 65153 1.5 12 720 63435 1.4 13 780 61740 to 14 840 60070 1.4 15 900 58423 1.3 16 960 56800 1.3 17 1020 55202 1.3 18 1080 53628 1.2 19 1140 52077 1.2 20 1200 50552 1.2 21 1260 49050 1.1 22 1320 47573 1.1 23 1380 46120 1.1 24 1440 44692 1.0 25 1500 43288 1.0 26 1560 41909 1.0 27 1620 40555 0.0 28 1680 39225 0.9 29 1740 37921 0.9 30 1800 36641 0.9 31 1860 35385 0.8 32 1920 34156 0.8 33 1980 32951 0.8 34 2040 31771 0.8 35 2100 30616 0.7 36 2160 29487 0.7 37 2220 28383 0.7 38 2280 27305 0.7 39 2340 26252 0.6 It 287,90 287.84 287.80 287,76 287.72 287.68 257.65 287.61 287.57 287,53 287.50 287,46 287.43 287.39 287.36 287.32 287,29 287.25 287.22 287,19 287.16 287.12 287,09 28706 287,03 287.00 286,97 28604 286.91 286,88 286.86 286.83 286.80 286.78 286.75 286,73 286.70 286.68 286.65 286,63 43268.0 Ks, constant 1.1 b, exponent 286.0 Reference Elevation, feet 4.0 Orfice Dia, inches 1.0 Number of Or6ces 0.6 Orifice Coefi 286.0 Invert Elevation. feet 0.6 cfs 0.2 cfs 0.0 cfs Primary Dis., cfs 0.6 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0,5 0.5 0.5 0.5 0.5 0.6 0.5 0.4 0.4 0.4 0.4 04 0.4 0.4 04 0.4 04 0.4 0.4 0.4 04 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 55 3300 12951 0.3 56-- 3360 12350 0.3 57 3420 11788 0.3 58 3480 1128u u.3 59 3540 10766 0.3 60 3600 10301 0.3 61 3660 9864 0.3 62 3720 0452 0.2 63 3780 9065 0.2 64 3840 8699 0.2 65 3900 8353 0.2 66 3960 8027 0.2 67 4020 7718 0.2 68 4080 7425 0.2 69 4140 7148 0.2 70 4200 6885 0.2 71 4260 6635 0.2 72 4320 6398 0.2 73 4380 6173 0.2 74 4440 5958 0.2 75 4500 5754 0.2 76 4560 5559 0.1 77 4620 5374 0.1 78 4680 5197 0.1 79 474n 6096 01 80 4800 4867 0.1 81 4860 4713 0.1 82 4920 4566 0.1 83 4980 4424 0.1 84 5040 4289 0.1 85 5100 4160 0.1 86 5160 4036 0.1 87 5220 3917 0.1 88 5280 3503 0.1 89 5340 3694 0.1 90 5400 3589 0.1 91 5460 3488 0,1 92 6520 3391 0.1 93 5580 3298 0.1 94 5640 3208 0.1 95 5700 3122 0.1 96 5760 3039 0.1 97 5820 2959 0.1 98 5880 2881 0.1 99 5940 2807 0.1 100 6000 2735 0.1 1u1 ou6U 2588 u.l 102 6120 2599 0.1 103 6180 2535 0.1 104 6240 2473 0.1 105 6300 2413 0.1 106 6360 2355 0.1 107 6420 2298 0.1 108 6480 2244 0.1 109 6540 2191 0.1 110 6600 2141 0.1 111 6660 2091 0.1 112 6720 2044 0.1 113 6780 1998 0.1 114 6840 1953 0.1 115 6900 1910 0.1 116 6960 1868 0.1 117 7020 1827 0.1 286.33 286.31 286.30 186.29 286.28 286.26 286.25 28624 286.23 286.23 286.22 286.21 286.20 286.20 286.19 286.18 286.18 286.17 286.16 286.16 200.15 286.15 286.14 286.14 9P6 14 286.13 286.13 286.12 286.12 286.12 286.11 286.11 286.11 266.11 286.10 286.10 286, 10 286.09 286.09 286.09 286.09 286.09 286.08 286.08 286.08 286.08 26ti.U8 286.07 286.07 286.07 286.07 286.07 286.07 286.06 286.06 286.06 286.06 286.06 286.06 286.06 286.06 286.05 286.05 0.2 0.2 0.1 U.1 0./ 0.1 0.1 0.1 0.1 01 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.0 0.0 nn 0.0 0.0 0.0 0.0 0.0 0.0 6.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 00 0.0 0.0 0.0 0.0 0.0 u.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Sheet 2 of 2 Permit No. State of North Carolina (lobe provided by DWQ) 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 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. I. PROJECT INFORMATION Project Name: McCullers Relo Facility j Contact Person: John Tucker Phone Number: ( 919 ) 567 0483 For projects with multiple basins, specify which basin this workshect applies to: Basin 2 elevations Basin Bottom Elevation 280.00 ft. (floor of the basin) Permanent Pool Elevation 286.00 ft. (elevation of the orifice) Temporary Pool Elevation 288.00 $, (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 28,722 sq. ft. (watersinface area at the orifice elevation) Drainage Area 21.3 ac. (on -site and off -site drainage to the basin) Impervious Area 17.20 ac, (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 90,753 1 cu. ft. (combined volume ofmain basin and,foreboy) Temporary Pool Volume 60,767 cu. ft. (volume detained above the permanent pool) Forebay Volume 24,784 cu. ft. (approximately 20%Oftotal volume) Other parameters SA/DA Diameter of Orifice Design Rainfall Design TSS Removal z FormSWU-102 Rev3.99 2.39 12 (surface area to drainage area ratio from DWQ table) in. (2 to 5 day temporary pool draw -down required) in. % (minimtnn 85% required) Page I of 4 Pond Number 2 /d f 3 Inc. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1.00 Depth of Runoff, inches 60767 Volume of Runoff, cf 2.0 Depth oflTemp Pool, feet 1 60 Desired Computational Interval, minutes 286.0 Starting Water Surface Elev. (Assumed) 288.0 Water Elevation 292.0 Top of Time, min. 0 60 120 180 240 300 360 420 480 540 600 660 720 780 840 900 960 1020 1080 1140 1200 1260 1320 1380 1440 im Initial Discharge Discharge at 2 days Discharge at 5 days 28586.2 Ks, constant 1.1 b, exponent 286.0 Reference Elevation, feet 2.5 Orfice Dia, inches - 1.0 Number of Orfices 0.6 Orifice Coeff 286.0 Invert Elevation, feet 0.2 cfs 0.2 cfs 0.0 cfs Storage, Primary cf Stage, ft. Elev., ft. Dis., cfs 60767 2.0 287.97 0.2 59961 1.9 287.95 0.2 59160 1.9 287.92 0.2 58363 1.9 287.90 0.2 57573 1.9 287.88 0.2 56787 1.9 287.86 0.2 56006 1.8 287.83 0.2 55231 1.8 287.81 0.2 54460 1.8 287.79 0.2 53695 1.8 287.76 0.2 52935 1.7 287.74 0.2 52180 1.7 287.72 0.2 51430 1.7 287.70 0.2 50686 1.7 287.67 0.2 49946 1.7 287.65 0.2 49212 1.6 287.63 0.2 48483 1.6 287.61 0.2 47759 1.6 287.59 0.2 47041 1.6 287.57 0.2 46328 1.5 287.54 0.2 45620 1.5 287.52 0.2 44917 1.5 287.50 0.2 44219 1.5 287.48 0.2 43527 1.5 287.46 0.2 42840 1.4 287.44 0.2 Sheet 2 of 3 39 2340 33174 1.1 287.14 0.2 40 2400 32572 1.1 287.12 0.2 41 2460 31976 1.1 287.11 0.2 42 2520 31386 1.1 287.09 0.2 43 2580 30801 1.1 287.07 0.2 44 2640 30221 1.1 287.05 0.2 45 2700 29647 1.0 287.03 0.2 46 2760 29078 1.0 287.02 0.2 47 2820 28515 1.0 287.00 0.2 48 2880 27957 1.0 286.98 0.2 49 2940 27405 1.0 286.96 0.2 50 3000 I 26859 0.9 286.95 0.2 51 3060 26317 0.9 286.93 0.1 52 3120 25782 0.9 286.91 0.1 53 3180 25252 0.9 286.89 0.1 54 3240 24728 0.9 286.88 0.1 55 3300 24209 0.9 286.86 0.1 56 3360 23695 0.8 286.84 0.1 57 3420 23188 0.8 286.83 0.1 58 3480 22686 0.8 286.81 0.1 59 3540 1 22189 0.8 286.80 0.1 60 3600 21699 0.8 286.78 0.1 61 3660 21214 0.8 286.76 0.1 62 3720 20734 0.7 286.75 0.1 63 3780 20261 0.7 286.73 0.1 64 3840 19793 0.7 286.72 0.1 65 3900 19330 0.7 286.70 0.1 66 3960 18874 0.7 286.69 0.1 67 4020 18423 0.7 286.67 0.1 68 4080 17978 0.7 286.66 0.1 69 4140 I 17539 0.6 286.64 0.1 70 4200 17105 0.6 286.63 0.1 71 4260 16677 0.6 286.62 0.1 72 4320 16256 0.6 286.60 0.1 73 4380 15839 0.6 286.59 0.1 74 4440 15429 0.6 286.57 0.1 75 4500 15025 0.6 286.56 0.1 76 4560 14626 0.5 286.55 0.1 77 4620 14234 0.5 286.53 0.1 78 4680 13847 0.5 286.52 0.1 79 4740 13467 0.5 286.51 0.1 80 4800 13092 0.5 286.49 0.1 81 4860 12723 0.5 286.48 0.1 82 4920 12360 0.5 286.47 0.1 83 4980 12003 0.5 286.46 0.1 Sheet 3 of 3 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 5880 5940 6000 6060 6120 6180 6240 6300 6360 6420 6480 6540 6600 6660 6720 6780 6840 6900 6960 7020 7080 7140 7200 7384 0.3 286.30 0.1 7126 0.3 286.29 0.1 6874 0.3 286.28 0.1 6629 0.3 286.27 0.1 6390 0.3 286.26 0.1 6157 0.3 286.25 0.1 5931 0.2 286.24 0.1 5712 0.2 286.23 0.1' 5499 0.2 286.23 0.1 5292 0.2 286.22 0.1 5092 0.2 286.21 0.1 4899 0.2 286.20 0.1 4714 0.2 286.20 0.0 4538 0.2 286.19 0.0 4370 0.2 286.18 0.0 4211 0.2 286.18 0.0 4060 0.2 286.17 0.0 3916 0.2 286.17 0.0 3779 0.2 286.16 0.0 3649 0.2 286.16 0.0 3524 0.2 286.15 0.0 3405 0.1 286.15 0.0 3292 0.1 286.14 0.0 Pennit No. (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 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. L PROJECT' INFORMATION Project Name: McCullers Relo Facility Contact Person: John Tucker Phone Number: (919 ) 567 0483 For projects with multiple basins, specify which basin I this worksheet applies to: Basin 3 elevations Basin Bottom Elevation 286.00 ft. (17oor of the basin) Permanent Pool Elevation 292.00 ft. (elevation ofthe orifice) Temporary Pool Elevation 294.00 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 39,245 sq. rt. (water surface area at the orifice elevation) Drainage Area 37.80 ac. (on -site and off -site drainage to the basin) Impervious Area 21.50 I ac. I (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 114,803, cu. ft. (combined volume of main basin andforebav) Temporary Pool Volume 80.690 i cu. ft. (volume detained above the permanent pool) Forebay Volume 24,967 cu. ft. I (approximately 20% of total volume) Other parameters S A/DA I 1.58 I (surface area to drainage area ratio from DWQ table) Diameter of Orifice 12 in. (2 to 5 day temporary pool draw -down required) Design Rainfall 1 in. Design TSS Removal 2 85 % (minimum 85% required) Form SWU-102 Rev 3,99 Page I of 4 Pond Number 3 /.,3 Inc. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 1.00 Depth of Runoff, inches 37367.1 80690 Volume of Runoff, cf 1.1 1.97 i Depth of Temp Pool, feet 292.0 60 Desired Computational Interval, minutes 3.0 292.0 Starting Water Surface Elev. (Assumed) 1.0 294.0 Water Elevation 0.6 292.0 296.0 Top of Dam Initial Discharge 0.3 Discharge at 2 days 0.2 Discharge at 5 days 0.0 Storage, Primary Time, min. cf Stage, ft. Elev., ft. Dis., cfs 0 80690 1.97 293.97 0.3 60 79536 1.95 293.95 0.3 120 78389 1.92 293.92 0.3 180 77250 1.90 293.90 0.3 240 1 76119 1.87 293.87 0.3 300 74996 1.85 293.85 0.3 360 73881 1.82 293.82 0.3 420 72773 1.80 293.80 0.3 480 1 71674 1.78 293.78 0.3 540 70582 1.75 293.75 0.3 600 69499 1.73 293.73 0.3 660 68423 1.70 293.70 0.3 720 67355 1.68 293.68 0.3 780 66295 1.66 293.66 0.3 840 65243 1.63 293.63 0.3 900 64200 1.61 293.61 0.3 960 63164 1.59 293.59 0.3 1020 62136 1.57 293.57 0.3 1080 61116 1.54 293.54 0.3 1140 60104 1.52 293.52 0.3 1200 59101 1.50 293.50 0.3 1260 58105 1.48 293.48 0.3 36 2160 44155 1.16 293.16 0.2 37 2220 43291 1.14 293.14 0.2 38 2280 42436 1.12 293.12 0.2 39 2340 41589 1.10 293.10 0.2 40 2400 40751 1.08 293.08 0.2 41 2460 39921 1.06 293.06 0.2 42 2520 39100 1.04 293.04 0.2 43 2580 38287 1.02 293.02 0.2 44 2640 37482 1.00 293.00 0.2 45 2700 36686 0.98 292.98 0.2 46 2760 35899 0.97 292.97 0.2 47 2820 35120 0.95 292.95 0.2 48 2880 34350 0.93 292.93 0.2 49 2940 33589 0.91 292.91 0.2 50 3000 I 32836 0.89 292.89 0.2 51 3060 32092 0.87 292.87 0.2 52 3120 31356 0.86 292.86 0.2 53 3180 30630 0.84 292.84 0.2 54 3240 29912 0.82 292.82 0.2 55 3300 29202 0.80 292.80 0.2 56 3360 28502 0.79 292.79 0.2 57 3420 27811 0.77 292.77 0.2 58 3480 27128 0.75 292.75 0.2 59 3540 26454 0.74 292.74 0.2 60 3600 25789 0.72 292.72 0.2 61 3660 25134 0.70 292.70 0.2 62 3720 24487 0.69 292.69 0.2 63 3780 23849 0.67 292.67 0.2 64 3840 I 23220 0.66 292.66 0.2 65 3900 22600 0.64 292.64 0.2 66 3960 21989 0.63 292.63 0.2 67 4020 21388 0.61 292.61 0.2 68 4080 20795 0.60 292.60 0.2 69 4140 20212 0.58 292.58 0.2 70 4200 19638 0.57 292.57 0.2 71 4260 19073 0.55 292.55 0.2 72 4320 18518 0.54 292.54 0.2 73 4380 17971 0.52 292.52 0.1 74 4440 17434 0.51 292.51 0.1 75 4500 I 16907 0.50 292.50 0.1 76 4560 16389 0.48 292.48 0.1 77 4620 15880 0.47 292.47 0.1 78 4680 15381 0.46 292.46 0.1 79 4740 14892 0.44 292.44 0.1 80 4800 14412 I 0.43 292.43 0.1 5riG6$-�9't 1 , Z�3 ✓ltGG 1. J V1 J 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 5700 5760 5820 5880 5940 6000 6060 6120 6180 6240 6300 6360 6420 6480 6540 6600 6660 6720 6780 6840 6900 6960 7020 7080 7140 7200 8388 0.27 292.27 0.1 8067 0.26 292.26 0.1 7756 0.25 292.25 0.1 7455 0.24 292.24 0.1 7169 0.23 292.23 0.1 6898 0.23 292.23 0.1 6640 0.22 292.22 0.1 6395 0.21 292.21 0.1 6162 0.20 292.20 0.1 5939 0.20 292.20 0.1 5728 0.19 292.19 0.1 5526 0.19 292.19 0.1 5334 0.18 292.18 0.1 5150 0.17 292.17 0.0 4975 0.17 292.17 0.0 4808 0.16 292.16 0.0 4648 0.16 292.16 0.0 4495 0.15 292.15 0.0 4348 0.15 292.15 0.0 4208 0.15 292.15 0.0 4074 0.14 292.14 0.0 3946 0.14 292.14 0.0 3822 0.13 292.13 0.0 3704 0.13 292.13 0.0 3591 0.13 292.13 0.0 3482 0.12 292.12 0.0 3p