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SW7080939_CURRENT PERMIT_20090522
STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE CURRENT PERMIT APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE it YYYYMMDD NCDENR North Carolina Department of Environment and Natural Resources Beverly Eaves Perdue Governor Freshwater Traders, LLC Attn: Mr. Bob Oakes PO Box 1807 Nags Head, NC 27959 Dear Mr. Oakes: Division of Water Quality Coleen K Sullins Director May 22, 2009 Dee Freeman Subject: Stormwater Permit No. SW7080939 Columbia Park - Phase 1 High Density Stormwater Project Tyrrell County The Washington Regional Office received a completed Stormwater Management Permit Application for the subject project on May 15, 2009. 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. SW7080939 dated May 22, 2009 for the subject project. 12,3°�vl This permit shall be effective from the date of issuance until May 22, 2019, 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 and in the submitted application. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. North Carol ina Division of Water Quality Internet, www.ncwaterqualitv.ore 943 Washington Square Mall Phone: 252-946-6481 Washington, NC 27889 FAX 252-946-9215 An Equal Opportunity)Affirmative Action Employer — 50% Recycled110% Post Consumer Paper NorthCarolina Naturally Page 2 of 9 Freshwater Traders, LLC May 22, 2009 Page Two If you have any questions, or need additional information concerning this matter, please contact either Bill Moore, or me at (252) 946-6481. Sincee ely, 1 AI Ho � e Regional Supervisor Surface Water Protection Section cc: Albemarle & Associates Tyrrell County Building Inspections Washington Regional Office Central Files Page 3 of 9 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 Freshwater Traders, LLC Columbia Park - Phase 1 Tyrrell County FOR THE construction, operation and maintenance of a wet detention basin in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit. This permit shall be effective from the date of issuance until May 22, 2019 and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.6 on page 4 of this permit. The stormwater controls have been designed to handle the runoff for Columbia Park, Phase 1, involving 6.07 acres of impervious area. 3. 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 and permit. 4. The tract will be limited to the amount of built -upon area indicated on page 4 of this permit, and per approved plans. Page 4 of 9 5. C. The runoff from all built -upon area within the permitted drainage areas of this project must be directed into the permitted stormwater control system The following design criteria have been provided in the wet detention basin and must be maintained at design condition: a. Total Site Area: 84.4 acres (Phase 1 Project Area) 10.3 acres b. Total Impervious Surfaces: 6.07 acres (Phase 1 only) C. Design Storm: 1.0 - inch d. Pond Depth: 6.4 ft e. TSS removal efficiency: 90 % f. Permanent Pool Elevation, FMSL: 1.4 ft g. Permanent Pool Surface Area Required: 26,417 sf h. Permanent Pool Surface Area Provided: 56,757 sf i. Permanent Storage Volume Required: 21,995 cf j. Permanent Storage Volume Provided: 48,603 cf k. Temporary Storage Elevation, FMSL: 2.2 ft I. Small Diameter Controlling Orifice: 3.5 - inch pipe M. Receiving Stream/River Basin: UT -Scuppernong River n. Classification of Water Body: SC II. SCHEDULE OF COMPLIANCE 1. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plans must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of slopes and the vegetated filter. Page 5 of 9 d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of bypass structure, filter media, flow spreader, catch basins, piping and vegetated filter. g. A clear access path to the bypass structure must be available at all times. 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken. 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 permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 7. 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. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 9. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. Page 6 of 9 10. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 11. A copy of the approved plans and specifications shall be maintained on file by the Permittee at all times. 12. 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. 13. This permit shall be effective from the date of issuance until May 22, 2019. Application for permit renewal shall be submitted 180 days prior to the expiration date of this permit and must be accompanied by the processing fee. III. GENERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director. In the event of a change of ownership, or a name change, the permittee must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 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) having jurisdiction. 4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 5. The permittee grants DENR Staff permission to enter the property during normal business hours for the 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. Page 7 of 9 7. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. A copy of the approved plans and specifications shall be maintained on file by the Permittee for the life of the project. 9. The permittee shall notify the Division of any name, ownership or mailing address changes within 30 days. Permit issued this the 22 nd day of May, 2009. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION ..\L+ for uoieen H. 6unrns, uirecior Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW7080939 Page 8 of 9 Stormwater Permit No. SW7080939 Wet Pond System Columbia Park - Phase 1 Columbia, NC 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. Note: The checklist on the following page must be included with this Certification. Any changes or deviations from the approved plans and specifications must be explained in detail, and may require a permit modification. The certification forms should be submitted to the Division of Water Quality at the appropriate Regional office. SEAL Signature Registration Number Date Page 9 of 9 Complete this checklist for each system and include with Certification: 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The bypass structure elevations are per the approved plan. 6. The bypass structure is located per the approved plans. 7. A 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. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. tVp State of North Carolina ,S (t f, }GK 9/20 g Department of Environment and Natural Resources Division of Water Quality RECEIVE® STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original SEK 3 0 2008 I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): Freshwater Traders, LLC 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): 3. Mailing Address for person listed in item 2 above: City:Nags Head State:NC Zip:27959 Phone: (252 1 480-2224 Fax: (252 ) 480-4705 Email:boakes®villagerealtyobx.com 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Columbia Park - Phase la 5. Location of Project (street address): City:Columbia County: Tyrrell Zip:27925 6. Directions to project (from nearest major intersection): 7. Latitude:35° 55' 13" N Longitude:760 14' 57" W of project 8. Contact person who can answer questions about the project: Name:Michael 1. Morway, PE Telephone Number: (252 ) 441-2113 Email:mikem@albemarleassociates.com II. PERMIT INFORMATION: 1. Specify whether project is (check one): ®New ❑Renewal ❑Modification FormSWU-101 Version02.19.08 Page 1 of 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit and its issue date (if 3. Specify the type of project (check one): ❑Low Density ®High Density ❑Redevelop ❑General Permit ❑Universal SMP ❑Other 4. Additional Project Requirements (check applicable blanks; information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑CAMA Major ®Sedimentation/Erosion Control ❑404/401 Permit ❑NPDES Stormwater III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Stormwater runoff from the homesites will sheet flow to new right-of-ways and easementswhere is will be collected via flumsa and curb inlets and conveyed to new swales. The swales will provide additonal filtration and infiltration as it directs the runoff into an engineered stormwater management pond for tretament 1rior to release. 2. Stormwater runoff from this project drains to the Pasquotank River basin. 3. Total Property Area: 84.4 acres 4. Total Wetlands 5. 100' Wide Strip of Wetland Area: acres (not applicable if no wetlands exist on site) 6. Total Project Area**:10.3 acres 7. Project Built Upon Area:59% % 8. How many drainage areas does the project have?1 9. 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. For high density projects, complete the table with one drainage area for each engineered stormwater device. Basin Information Drainage Area 1 Drainage Area 2 Receiving Stream Name Scuppernong Stream Class & Index No. 30-144-(9) , SC Total Drainage Area (so 448,428 On -site Drainage Area (so 448,428 Off -site Drainage Area (so 0 (2L Existing Impervious* Area (so 0 Proposed Impervious*Area (so 264,487 % Impervious* Area (total) 59% Impervious* Surface Area Drainage Area 1 Drainage Area 2 On -site Buildings (so 175,674 On -site Streets (so 80,089 On -site Parking (so 0 On -site Sidewalks (so 8,724 Other on -site (so 0 Off -site (so 0 Total (so: 264,487 Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. **Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area percentage calculation. This is the area used to calculate percent project built upon area (BUA). Form SWU-101 Version 02.19.08 Page 2 of 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 ®High Density. ❑Redevelop ❑General Permit ❑Universal SMP ❑Other 4. Additional Project Requirements (check applicable blanks; information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑CAMA Major ®Sedimentation/Erosion Control 0404/401 Permit ❑NPDES Stormwater III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Stormwater runoff from the homesites will sheet flow to new right-of-ways and easementswhere is will be collected via flumsa and curb inlets and conveyed to new swales. The swales will provide additonal filtration and infiltration as it directs the runoff into an engineered stormwater management pond for tretament prior to release. 2. Stormwater runoff from this project drains to the Pasquotank River basin. 3. Total Property Area: 84.4 acres 3r 47611 96¢S 4. Total Wetlands Area: acres 5. 100' Wide Strip of W nd Area: acres (not applicable if no wetlands exist on site) 6. Total Project Ar ":10.3 acres t 1. Q9 a c 7 7. Project Built Upon Area:59% 7 % 8. How many drainage areas does the project have?l 9. 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. For high density projects, com lete the table with one drainage area for each engineered stormwater device. Basin Information Drainage Area 1 Drainage Area 2 Receiving Stream Name Scuppernong Stream Class & Index No. 30-14-4-(9) , SC Total Drainage Area (so 517,990 On -site Drainage Area (sf) 517,990 Off -site Drainage Area (so 0 0 7 ! . 61 : SJ Existing Impervious* Area (so 0 Proposed Impervious'Area (so 264,487 07 d , 3 = 9 % Impervious* Area (total) 59% Impervious" Surface Area Drainage Area 1 Drainage Area 2 On -site Buildings (so 175,674 On -site Streets (so 80,089 On -site Parking (so 0 On -site Sidewalks (so 8,724 Other on -site (so 0 Off -site (so 0 Total (sf): 264,487 1,16.07 qc Impervious area is defined as the built upon area including, but not lirnited to, buildings roads, parking areas, sidewalks, gravel areas, etc. "Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area percentage calculation. This is the area used to calculate percent project built upon area (BUA). Form S WU-I01 Version 02.19.08 Page 2 of 4 10. How was the off -site impervious area listed above derived?From CADD drawings IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS One of the following 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. Forms can be downloaded from ham://h2o.enr.state.nc.us/su/bmp forms.htm - deed restrictions. Form DRPC-1 High Density Commercial Subdivisions Form DRPC-2 High Density Developments with Outparcels Form DRPC-3 High Density Residential Subdivisions Form DRPC4 Low Density Commercial Subdivisions Form DRPC-5 Low Density Residential Subdivisions Form DRPC-6 Low Density Residential Subdivisions with Curb Outlets By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required in the above form, 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. Forms can be downloaded from http://h2o.enr.state.nc.us/su/bmp forms.htm. Form SW401-Low Density Form SW401-Curb Outlet System Form SW401-Off-Site System Form SW401-Wet Detention Basin Form SW401-Infiltration Basin Form SW401-Infiltration Trench Form SW401-Bioretention Cell Form SW401-Level Spreader Form SW401-Wetland Form SW401-Grassed Swale Form SW401-Sand Filter Form SW401-Permeable Pavement Low Density Supplement Curb Outlet System Supplement Off -Site System Supplement Wet Detention Basin Supplement Infiltration Basin Supplement Underground Infiltration Trench Supplement Bioretention Cell Supplement Level Spreader/Filter Strip/Restored Riparian Buffer Supplement Constructed Welland Supplement Grassed Swale Supplement Sand Filter Supplement Permeable Pavement Supplement Form SWU-101 Version 02.19.08 Page 3 of 4 VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the interactive online map at htto://h2o.enr.state.nc.us/su/msi mans.htm) 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form P`S r'� • Original and one copy of the Deed Restrictions & Protective Covenants Form (if KSe' required as per Part IV above) • Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP t1S r • Permit application processing fee of $505 ($4,000 for Express) payable to NCDENR h'S r^ • Calculations & detailed narrative description of stormwater treatment/management h'S n • Copy of any applicable soils report MSM • Two copies of plans and specifications (sealed, signed & dated), including: AM - Development/Project name - Engineer and firm -Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. (ex. designing engineer or firm) Designated agent (individual or firm):Michael 1. Morway, PE, Albemarle & Associates, Ltd Mailing Address:115 West St. Clair St. City:Kill Devil Hills State:NC Zip:27948 Phone: (252 ) 441-2113 Fax: (252 ) 441-0965 Email:mikem@albemarleassociates.com VIII. APPLICANT'S CERTIFICATION I, (print or type name of person 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 �l i that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be r orde and that the proposed project complies with the requirements of 15A NCAC 2H .100 C i ((�� I i ,I I �3 Signature: tvL t' Pr tlt q?w I °w" Date: T% ! { GT Form SWU-101 Version 02.19.08 Page 4 of High Density Residential Subdivisions Deed Restrictions & Protective Covenances In accordance with Title 15 NCAC 2H.1000, the Stormwater Management Regulations, deed restrictions and protective covenants are required for High Density Residential Subdivisions where lots will be subdivided and sold and runoff will be treated in an engineered stormwater control facility. Deed restrictions and protective covenants are necessary to ensure that the development maintains a "built -upon" area consistent with the desiggnn criteria used t size the stormwater control facility. I, �r . acknowledge, affirm and agree by my signature below, that I will cause the following deed restrictions and covenants to be recorded prior to the sale of any lot: 1. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number as issued by the Division of Water Quality under NCAC 2H.1000. 2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the stormwater management permit. 3. These covenants are to run with the land and be binding on all persons and parties claiming under them. 4. 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. 5. Alteration of the drainage as shown on the approved plan may not take place without the concurrence of the Division of Water Quality. 6. The maximum allowable built -upon area per lot is 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. OR, if the proposed built -upon areas per lot will vary, please REPLACE #6 above with the following: 6. The maximum built -upon area per lot, in square feet, is as listed below: Lot # BUA Lot # BUA Lot #' BUA Lot # BUA 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. < 7. All runoff from the built -upon areas on the lot must drain into the permitted system. This may be accomplished through a variety of means including roof drain gutters which drain to the street, grading the lot to drain toward the street, or grading perimeter swales to collect the lot runoff and directing them into a component of the stormwater collection system. Lots that will naturally drain into the system are not required to orbvide t1heseadditibnal measures. -1llc1169 I, a Notary Public in the State of 47--VA PAR-&-tojA ICounty of �AY� do hereby certify that �l�e� ( ©e,4s I✓ personally appeared be7du a this the �P day of 0 20 , and acknowledge t xecution o t"hja f� going instrument. Witness my hancka�Acial SEP 3 0 2008 MZD zo $ y (�& Commission expires :,jJIJf).'A��i�� Form D C-3 Rev.l Page 1 of 1 Columbia Park - Lot Area Table Area of Lot Coverage Lot# Lot (SF) 80% 1 7,626 6,101 2 7,108 5,686 3 7,733 6,186 4 8,249 6,599 5 8,559 6,847 6 8,663 6,930 7 8,565 6,852 8 8,267 6,614 9 7,855 6,284 10 10,230 8,184 11 7,776 6,221 12 6,400 5,120 13 6,204 4,963 14 6,009 4,807 15 7,514 6,011 16 7,514 6,011 17 6,007 4,806 18 6,201 4,961 19 6,395 5,116 20 7,772 6,218 21 8,036 6,429 22 6,744 5,395 23 6,717 5,374 24 6,691 5,353 25 6,664 5,331 26 6,638 5,310 27 6,611 5,289 28 6,585 5,268 29 6,559 5,247 30 7,701 6,161 Total 219,693 175,674 Albemarle & Associates, Ltd. 9/29/2008 Permit (to be imo iyatl by DWq) 1z/, Z10 8 HCDEIR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all of the required information. I. PROJECT INFORMATION Project name Columbia Pads - Phase 1a Contact person Michael J. Morway Phone number 252-441-2113 Date Drainage area number fir t O�OF WATF90G h y r o < II. DESIGN INFORMATION Site Characteristics Drainage area 517,990 ft' Impervious area, postdevelopment .264,487 fez o7 4'�) %impervious 51.06 % Design rainfall depth 10 in Storage Volume: Non -SA Waters Minimum volume required 21,995 it' OK Volume 48,603 '/ provided ft' OK, vdtarle provided is equal to or in excess of volume required. Storage Volume: SA Waters 1.5' runoff volume nia 11' Pre -development 1-yr, 24-hr runoff 11' Post -development 1-yr, 24-hr runoff to Minimum volume required nla ft' Volume provided ft' Peak Flow Calculations Is the pre/post control of the 1yr 24hr stone peak flow required? 1-yr, 24-hr rainfall depth Rational C, pre -development Rational C, post -development Rainfall intensity: l-yr, 24-hrstorm Pro -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak flow, control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Top of 1Oft vegetated shelf elevation Bottom of 10ft vegetated shelf elevation Sediment deanout, top elevation (bottom of pond) Sediment cleanout, bottom elevation Sediment storage provided Is there additional volume stored above the statetequired temp. pod? Elevation of the top of the additional volume (Y or N) in (unless) (unitiess) inlhr ft'Isec ft'Isec 2.20 fmsl 1.40.fmsl 1.40 final 1.90 fmsl 0.90 fed -5.00 fist - ( y- PP Data not needed for calculation option #1, but OK if provided. -8.00 tfnsl Data not needed for calculation option #1, but OK if provided. 3.00 It y (Y or N) 2.2 fmsl OK Fmm SW401-Wet Detention aasb Rev.5 pares i. a n. Design Summary, Page 1 of 2 (m be ProvidBd by DWQ) II. DESIGN INFORMATION Surface Areas Area, temporary pool 63,866 f? Area REQUIRED, permanent pool SAIDA ratio Area PROVIDED, permanent pod, Ar,,,,y,f Area, bottom of 10ft vegetated shelf, Ap, ore Area, sediment deaceuL top elevation (bottom of pond), Ay,., Volumes Volume, temporary pod Volume, permanent pool, Vp,,,, a„ Volume, forebay (sum of forebays if more than one fombay) Forebay % of permanent pool volume SAIDA Table Data Design TSS removal Coastal SAIDA Table Used? MountainlPiedaont SAIDA Table Used? SAIDA ratio Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10-2b) Volume, permanent pool, Vp,,,,_p , Area provided, permanent pool, Ao, , , Average depth calculated Average depth used in SAIDA, d,,, (Round to nearest 0.5ft) Calculation option 2 used? (See Figure 10-2b) Area provided, permanent pool, AP,,,,you, Area, bottom of 10ft vegetated shelf, Ate,,, Area, sediment dearout, top elevation (bottom of pond), Ae ., 26,417 fl' 5.10 (uni8ess Z 56,757 W OK 51,610 fit' 25,454 ft` 48.603 it' OK 208,784ft' 40,440 it' 19A% % OK 90 % y (Y or N) n (Y or N) 5.10 (unless) y (Y or N) 208,784 ft' 56.757 fl 3.70 it 3.5 it n (Y or N) fi (t` 'Depth' (distance b/w bottom of 1011 shelf and top of sediment) it Average depth calculated it Average depth used in SAIDA, d„, (Round to nearest 0.5ft) it Drawdown Calculations Drawdown through orifice? Diameter of orifice (f circular) Area of orifice (lf-noncircular) Coefficient of discharge (CO) Driving head (Ho) Drawdown through weirs Weir type Coefficient of discharge (C„) Length of weir (L) Driving head (H) Pre -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Storage volume discharge rate (through discharge orifice or weir) Storage volume diawdown time Additional Information Vegetated side slopes Vegetated shelf slope Vegetated shelf width Length of ftowpath to width ratio Length to width ratio Trash rack for overflow & orifice? Freeboard provided Vegetated filter provided? Recorded drainage easement provided? Capures all runoff at ultimate build -out? Drain mechanism for maintenance or emergencies y (Y or N) 3.50 in in' 0.60 (unidess) 0.12 it n (Y or N) (unidess) (unidess) it It ft'Isec 0.11 ft'/sec 2.27 days 3 :1 10 :1 10.0 If 3 :1 3.0 :1 OK OK Check calculation. OK Storage volume discharge rate greater than predev. 1y24hr. OK, draws down in 2-5 days. Drawdown time varying from expected value by more than a half day. Check calculation. OK OK OK OK OK y (Y or N) OK 1.0 If OK n (Y or N) OK (Y or N) y (Y or N) OK pond is below water table - dewateringis required to empty Fore SW401-Wet Deteneon Basin-Rev.5 Parts I. & II. Design Summery, Page 2 of 2 Permit Number: (to be provided by DWQ) Drainage Area Number: Wet Detention Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. 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 ® does not incorporate a vegetated filter at the outlet. This system (check one): ® does ❑ does not incorporate pretreatment other than a forebay. Important maintenance procedures: — Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). — No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. — Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. — If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. — Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspected once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance should be kept in a known set location and must be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem: How I will remediate theproblem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to detention basin erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide time and a one-time fertilizer application. Vegetation is too short or too Maintain vegetation at a height of long. approximately six inches. Form SW401-Wet Detention Basin O&M-Rev.3 Page 1 of 4 Permit Number: (to be provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The inlet device: pipe or The pipe is clogged. Unclog the pipe. Dispose of the swale sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale if necessary to swale. smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. The forebay Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design depth for possible. Remove the sediment and sediment storage. dispose of it in a location where it will not cause impacts to streams or the BMP. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The vegetated shelf Best professional practices Prune according to best professional show that pruning is needed practices to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Weeds are present. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. The main treatment area Sediment has accumulated to Search for the source of the a depth greater than the sediment and remedy the problem if original design sediment possible. Remove the sediment and storage depth. dispose of it in a location where it will not cause impacts to streams or the BMP. Algal growth covers over Consult a professional to remove 50% of the area. and control the algal growth. Cattails, phragmites or other Remove the plants by wiping them invasive plants cover 50% of with pesticide (do not spray). the basin surface. Form SW401-Wet Detention Basin O&M-Rev.3 Page 2 of 4 Permit Number: (to be provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to groin on Consult a dam safety specialist to the embankment remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. 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 6.25 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 66:0 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Sediment Removal . -5 Pe anen Pool _------------- ___ Vn111me Bottom fft Min. Sediment Storage Permanent Pool Elevation 1.0 Sediment Removal Elevation -5_75 Volume ---------------------------------------- ------ Bottom Elevation -8 J,1-ft Storage FOREBAY MAIN POND Form SW401-Wet Detention Basin O&M-Rev.3 Page 3 of 4 Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the 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. Project name BMP drainage area number:Drainage Area #1 Print name:Bob Oakes M''1? j� Wel Tr a P� f trT L Title:Manager Address:PO Box 1807 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, _ JOµ.y cyGA a Notary Public for the State of /yTartd b7tt WA County of "�;?_ff , do hereby certify that p yf 0&1;5 � Iw- personally appeared before me this day of i6tv I ?C&O , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal k�* e....Couati� . SEAL G My commission expires et 20DU Form SW401-Wet Detention Basin O&M-Rev.3 Page 4 of 4 Permit L\. (to be provided by DWq) F-WA OF W ATpq NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part 111) must be printed, Filled out and submitted along with all of the required information. I. PROJECT INFORMATION Project name Colmbia Park - Phase to Contact person Michael J. Morway Phone number 252-441-2113 Dale 25-Sep-08 Drainage area number 1 II. DESIGN INFORMATION Site Characteristics Drainage area 448,428.00 flz Impervious area 264,487.00 ft' I %impervious 58.98092893 % Design rainfall depth 1.00 in 6+s— Storage Volume: Non -SR Waters Minimum volume required Volume provided Storage Volume: SR Waters 1-yr, 24-hr runoff depth Pre -development 1-yr, 24-hr runoff Post -development 1-yr, 24-hr runoff Minimum volume required Volume provided Peak Flow Calculations 1-yr, 24-hr rainfall depth Rational C, pre -development Rational C, post -development Rainfall intensity: 1-yr, 24-hr storm Pre -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak flow control Basin Elevations Basin bottom elevation Sediment cleanout elevation Bottom of shelf elevation Permanent pool elevation SHWT elevation Top of shelf elevation Temporary pool elevation 21,705.00 ft3 51,067.00 ft3 in ft3 ft3 It, tt3 3.60 in 0.30 (unitless) 0.66 (unitless) 0.16 inthr 15.10 ft3/sec 33.30 ft3/sec 18.20 ft3/sec -8.00 ft 5.75 It -1.50 ft 1.00 ft 1.00 ft 1.00 ft 2.00 ft .'L FC EIv7'' � j, rlf� SEP 3 0 2008 Form SW401-Wet Detention Basin-Rev.4 Parts I. & II. Design Summary, Page 1 of 2 Permit No. J, (to be pmvlded by DWQ) J II. DESIGN INFORMATION Volume and Surface Area Calculations SAIDA ratio 4.10 (unitless) Surface area at the bottom of shelf 33,696.00 ft' Volume at the bottom of shelf 72,646.00 W Permanent pool, surface area required 18,295.00 le Permanent pool, surface area provided 47,455.00 f? OK Permanent pool volume 251,639.00 ft3 Average depth for SAIDA tables 5.30 ft OK Surface area at the top of shelf 47,455.00 f? Volume at the top of shelf 251,639.00 ft' Forebay volume 54,103.00 ft' Forebay % of permanent pool volume 21.50 % OK Temporary pool, surface area provided 54,678.00 ft' Drawdown Calculations Treatment volume drawdown fime 2.40 days OK Treatment volume discharge rate 0.10 W/s Pre -development 1-yr, 24-hr discharge Wls Post -development 1-yr. 24-hr discharge ft'/s Additional Information Diameter of orifice 2.5 in Design TSS removal 90 % Basin side slopes 3.00 :1 OK Vegetated shelf slope 6.00 :1 Side Slopes are too steep, maximum 10:1 Vegetated shelf width 15.00 ft OK Length of flowpath to width ratio 3.00 :1 OK Length to width rafio 3.00 :1 OK Trashrack for overflow & orifice? y (Y or N) OK Freeboard provided 1.00 ft OK Vegetated filter provided? n (Y or N) Design must be based on 90% TSS removal Recorded drainage easement provided? (Y or N) Capures all runoff at ultimate build -out? y (Y or N) OK Drain mechanism for maintenance or emergencies n Form SW401-Wet Detention Basin-Rev.4 Parts 1. & It. Design Summary, Page 2 of 2 Permit No. (to be provided by DWQ) III. REQUIRED ITEMS CHECKLIST Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Pagel Plan Initials Sheet No. C� 1. Plans (1' - 50' or larger) of the entire site showing: a C�Z Design at ultimate build -out, Off -site drainage (if applicable), Delineated drainage basins (include Rational C coefficient per basin), Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, Proposed drainage easement and public right of way (ROW, Overflow device, and Boundaries of drainage easement. M C 2. Partial plan (1" = 30' or larger) and details for the wet detention basin showing: - Outlet structure with trash rack or similar, - Maintenance access, - Permanent pool dimensions, - Forebay and main pond with hardened emergency spillway, - Basin cross-section, - Vegetation specification for planting shelf, and - Filter strip. +�4r C3�Z 3. Section view of the dry detention basin (1' = 20' or larger) showing: - Side slopes, 3:1 or lower, - Pretreatment and treatment areas, and - Inlet and outlet structures. H51� 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified on the plans prior to use as a wet detention basin. MS I" AM4ZIAOD 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. MT" '�— 3� 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the entire drainage area is stabilized. M 1p�k�F- 7. The supporting calculations. 8. A copy of the signed and notarized operation and maintenance (O&M) agreement. 9. A copy of the deed restrictions (if required). 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County soil maps are not an acceptable source of soils information. Forth SW401-Wet Detention Basin-Rev.4 Part III. Required Items Checklist, Page 1 of 1 High Density Residential Subdivisions Deed Restrictions & Protective Covenances In accordance with Title 15 NCAC 2H.1000, the Stormwater Management Regulations, deed restrictions and protective covenants are required for High Density Residential Subdivisions where lots will be subdivided and sold and runoff will be treated in an engineered stormwater control facility. Deed restrictions and protective covenants are necessary to ensure that the development maintains a "built -upon" area consistent with the design criteria used tq,size the stormwater control facility. 1, �rt K �r • acknowledge, affirm and agree by my signature below, that I will cause the following deed restrictions and covenants to be recorded prior to the sale of any lot: 1. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number as issued by the Division of Water Quality under NCAC 2H.1000. 2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the stormwater management permit. 3. These covenants are to run with the land and be binding on all persons and parties claiming under them. 4. The covenants pertaining to stomrwater may not be altered or rescinded without the express written consent of the State of North Carolina, Division of Water Quality. 5. Alteration of the drainage as shown on the approved plan may not take place without the concurrence of the Division of Water Quality. 6. The maximum allowable built -upon area per lot is 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. OR, if the proposed built -upon areas per lot will vary, please REPLACE #6 above with the following: 6. The maximum built -upon area per lot, in square feet, is as listed below: Form Lot # BUA Lot # BUA Lot # BUA Lot # BUA 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. All runoff from the built -upon areas on the lot must drain into the permitted system. This may be accomplished through a variety of means including roof drain gutters which drain to the street, grading the lot to drain toward the street, or grading perimeter swales to collect the lot runoff and directing them into a component of the stormwater collection system. Lots that will naturally drain into the system are not required In n/nvide tlhP.,z"ridihhnal mks ci irac M `1/i(, (69 , a Notary Public in the State of /)OF A PAR- LX�A , County of -DAEM do hereby certify that Ter--(- 1044S J t,, personally appeared bef a this the /lv day of l AV 20 '9 , and acknowledge=jay��: t e du xecution o t e f�egoing instrument. Witness my han¢.aridl SEP 3 0 2w V ! , mission ex ires 664 ZO 2 60 0 ............. Rev. I Page 1 of 1 `� Gs U ik:� i .�-trlS`..- Columbia Park - Lot Area Table Area of Lot Coverage Lot # Lot (SF) 80% 1 7,626 6,101 2 7,108 5,686 3 7,733 6,186 4 8,249 6,599 5 8,559 6,847 6 8,663 6,930 7 8,565 6,852 8 8,267 6,614 9 7,855 6,284 10 10,230 8,184 11 7,776 6,221 12 6,400 5,120 13 6,204 4,963 14 6,009 4,807 15 7,514 6,011 16 7,514 6,011 17 6,007 4,806 18 6,201 4,961 19 6,395 5,116 20 7,772 6,218 21 8,036 6,429 22 6,744 5,395 23 6,717 5,374 24 6,691 5,353 25 6,664 5,331 26 6,638 5,310 27 6,611 5,289 28 6,585 5,268 29 6,559 5,247 30 7,701 6,161 Total 219,593 175,674 Albemarle & Associates, Ltd. 9/29/2008