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HomeMy WebLinkAboutSW7060712_CURRENT PERMIT_20070409STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW:Za�a42 Z/2 DOC TYPE CURRENT PERMIT C❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE .62a YYYYMM DD .'• Michael F. Easley, Governor William G. Ross Jr., Secretary r North Carolina Department of Environment and Natural Resources I Y Alan W. Klimek, P.E. Director Division of Water Quality DIVISION OF WATER QUALITY April 9, 2007 County of Dare Attn: Mr. Terry Wheeler PO Box 1000 Manteo, NC 27954 Subject: Stormwater Permit No. SW7060712 Hatteras Satellite Office High Density Stormwater Project Dare County Dear Mr. Wheeler: The Washington Regional Office received a completed Stormwater Application for the subject project on February 26, 2007. 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. SW7060712 dated April 9, 2007 to Dare County. This permit shall be effective from the date of issuance until April 9, 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 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 Carolina Division of Water Quality Internet: wwo,mcwaternualitv.orm 943 Washington Square Mall Phone (252) 946-6481 Washington, NC 27889 Fax (252) 946-9215 Nne orthCarohna Naturallry An Equal Opporlunity/Affirmative Action Employer— 50 % Recycled110 % Post Consumer Paper County of Dare April 9, 2007 Page Two If you have any questions, or need additional information concerning this matter, please contact Mr. Bill Moore at (252)948- 3919. Sincer y, Al Hodge, Regional Supervisor Surface Water Protection Section Washington Regional Office cc: Mulkey Engineers Dare County Planning/Inspections t/4ARO Stormwater Files Central Files State Stormwater Management Systems Permit No. SW7060712 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 County of Dare Dare County FOR THE construction, operation and maintenance ofstormwater management systems 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 for (3) infiltration basins to serve the Hatteras Satellite Office located off NC12 at Frisco, NC. This permit shall be effective from the date of issuance until April 9, 2017, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to .the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described on page 9 of this permit, the Project Data Sheet. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 3 DIVISION OF WATER QUALITY PROJECT DATA Project Name: Permit Number: Location: Applicant: Mailing Address: Application Date: Water Body Receiving Stormwater Runoff: Classification of Water Body: Total Site Area: Total Impervious Surfaces Allowed: Basin Depths: Required Storage Volume: Provided Storage Volume: Provided Surface Area: Storage Elevations: VA Hatteras Satellite Office SW7060712 Dare County County of Dare PO Box 1000 Manteo, NC 27954 07/17/2006; original 02/26/2007; complete Pamlico Sound SA 28.9 acres 1.01 acres 0.75 ft - Basin 1 0.80 ft - Basin 2 2.25 ft - Basin 3 1133 cf - Basin 1 1105 cf - Basin 2 2181 cf - Basin 3 4487 cf - Basin 1 2222 cf - Basin 2 4530 cf - Basin 3 4876 sf - Basin 1 2625 sf - Basin 2 1313 sf - Basin 3 5.92 ft - Basin 1 7.30 ft - Basin 2 6.75 ft - Basin 3 4. No homeowner/lot owner/developer shall be allowed to fill in, alter, or pipe any vegetative practices (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the permit and receiving approval from the Division. 5. The following items will require a modification to the permit: a. Any revision to the approved plans, regardless of size b. Project name change C. Transfer of ownership d. Redesign or addition to the approved amount of built - upon area e. Further subdivision of the project area. In addition, the Director may determine that other revisions to the project should require a modification to the permit. 6. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. II. SCHEDULE OF COMPLIANCE 1. The permittee will comply with the following schedule for construction and maintenance of the stormwater management system. a. 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 surfaces except roads. b. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 2. The facilities must be properly maintained and operated at all times. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency including, but not limited to: 5 a. Semi-annual scheduled inspections (every 6 months) b. Sediment removal C. Mowing and revegetation of side slopes d. Immediate repair of eroded areas e. Maintenance of side slopes in accordance with approved plans and specifications f.. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping. 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. . 5. 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. 6. Upon completion of construction 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. Mail the Certification to the Washington Regional Office, 943 Washington Square Mall, Washington, North Carolina, 27889, attention Division of Water Quality. 7. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of five years from the date of the completion of construction. III. GENERAL CONDITIONS 1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a formal permit request must be submitted to the Division of Water Quality accompanied by an application fee, 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. 2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6(a) to 143-215.6(c). 3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction. 6 9. 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 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. 6. At least 6 months prior to the expiration date, the permittee shall request that this permit be renewed. Permit issued this the 9 th day of April, 2007. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Alan W. Klimek, P.E., Director Division of Water Quality By Authority of the Environmental Permit Number SW7060712 7 Management Commission Stormwater Permit SW7060712 (3) Infiltration Basins Hatteras Satellite Office Frisco, NC Designer's Certification as a duly registered Professional Engineer in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, for (Project) (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. Signature Registration Number Date n Vif g4-/�(o llk/o� ®�p►(�_1hI.A (�O State of North Carolina NV Q V ADPutment of Environment and Natural Resources Division of Water Quality sidAc, 7/ao/xp STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION i. Applicants name (specify the name of the corporation, individual, etc, who owns the project): . Co UNTV Or PARE 2. Print Owner/Signing Official's name and tide (person legally responsible forfacilityand compliance): 1'...., 9 .... , rrtl �� Coti n { ar 3. Mailing Address for person listed in item 2 above: City: MA'VTEO State: lJ.C. Zip: Z7454 Telephone Number: 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): I-4ATTEQA5 SATE" irF OF,CE 5. Location of Project (street address): 563�6 Tic- 14wy IZ City: Frisco County E)APE 6. Directions to project (from nearest major intersection): Ae1prcx• Si000 WEST ALo, N.C, Hwy IZ Fropi IN-E iSK'T o 7. Latitude: 35' N Longitude: 7534t 50 of project 8. Contact person who can answer questions about the project: Name: CNRi57opwc2 F2yrmr Telephone Number. (qlq II. PERMIT INFORMATION: 1. Specify whether project is (check one): New Renewal Modification Fomi SWU-101 Version 3.99 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 number and its issue date (if known) 3. Specify the type of project (check one): Low Density ✓ High Density _Redevelop General Permit _Other 4. Additional Project Requirements (check applicable blanks): _CAMA Major / Sedimentation/Erosion Control _404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION I. 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 . KuNn�G Fzom ) mk W5Srgzy RAPT OF TH F_ SItF WILL U'YIL;'; F22 SFKF_U T F.^,W (�U 2 SI�P.Q TP /Nfr)LAnc/! r3c,: /, i. I Hr � -. EAs.��Rh/ 7,6g: ,0W '! ILL A,:;c r/Li r HFF'r 1"LCW �A/r0 z 7'?�15��D' S Wn[s ���� li:0 L1= LcN('� 1-cCWIN4 �N 0PPo5 rTY IiIRECT/oN.. 2. Stormwater runoff from this project drains to the PASc^orAmic River basin. 3. Total Project Area: ze.4o acres 4. Project Built Upon Area: 3. d� % 5. How many drainage areas does the project have? :3 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Basin Information Drainage Area I Drainage Area 2 Receiving Stream Name / P >1Lrcc so,,•.�o PnmLico ,; ; So Receiving Stream Class SA e; W SA 40 W Drainage Area ( O. 5 q Ac Existing Impervious" Area 0.036 Ac 0, o$6 A c Proposed Impervious Area o,Zq6 Ac o,ZN Ac % Impervious` Area (total) Impervious` Surface Area Drainage Area I Drainage Area 2 On -site Buildings — O 7o Ac On -site Streets o 133 Ac 0. O 1 On -site Parking 0 35c 0.61 , Z Ac On -site Sidewalks 0.0Z6 4C 0.010 A Other on -site — _ Off -site - 0, 0'z 6 AC Ac Total: . 256 A c- Total: 0. *Z0 Ac 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 Information Drainage Area 3 Receiving Stream Name Pamlico Sound Receiving Stream Class SA; HOW Drainage area 1.934 Existing Impervious Area 0 Proposed Impervious Area 0.483 AC % Impervious Area (total) 24.97% Impervious Surface Area Drainage Area 3 On -site buildings 0.199 AC On -site streets 0.101 AC On -site parking 0.147 AC On -site sidewalks 0.036 AC Other on -site 0.000 AC Off -site 0.000 AC Total: 0A83 AC 7. How was the off -site impervious area listed above derived? ELL tt F rTFl! `.� vzV-, Ftc v 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 runalf from outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwa ter can trol system shall be performed in a manner that maintains the integrity and performance of One system as pernitted. 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-]02 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement For SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form e"AF • One copy of the applicable Supplement Fonn(s) for each BMP CAF • Permit application processing fee of $420 (payable to NCDENR) CAF • Detailed narrative description of stormwater treatment/management CAF • Two copies of plans and specifications, including: car - 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 sweets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm): Mow<e'y FNC�iN�AZS `} C.��,�s.',:rn�✓IS Mailing Address: G %ri0 'jgyc., SAD Phone: Nice ) 8:s-8 lSZ3 VIII. APPLICANT'S CERTIFICATION State: A/ C Zip: Z 7J 11 Fax: ( qfq ) 6',rl-/1/R I, (print or type name of person listed in General information, item 2) / 4'C-1JLJ�'`z� e✓ 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 wit] be recorded, and that the proposed project complies with the requirements of ISA NCAC 2H .1000. Date: Form SWU-101 Version 3.99 Page 4 of 4 Permit No. (lobe provided by DTVQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality s�EG F.b�i7 Lam® STORMWATER MANAGEMENT PERMIT APPLICATION FORM INFILTRATION BASIN SUPPLEMENT JUL 17 2006 This form may be photocopied for use as an original DINQ_WAR® DWO Stormwater Management Plan Review: UVS[ A complete stormwater management plan submittal includes a stormwater management permit application, an infiltration basin supplement for each system, design calculations, soils report and plans and specifications showing all stormwater conveyances and system details. 1. PROJECT INFORMATION Project Name : HATTr-gj, ,< 3ATF/ ' Oi-r-tce Contact Person: (— uR 1SroPt+cR rLyTiar- Phone Number: (919 ) f35R--/�31 C3 This worksheet applies to: Basin No. 1 in Drainage Area (rrs identified On plaue) (from Form Srrt1-l0/,) II. DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be based upon an actual field investigation and soil borings. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Soils Report Summary Soil Type CnArP Oua' rllo= 5Amb5 1 ARay 'F11"b1-u Infiltration Rate . in/hr or cf/hr/sf (circle appropriate units) SHWT Elevation 2• o f117S1 (Seasonal High FYatei Table elevalion) Basin Design Parameters Design Storni _ 3 inch (1.5 inch event jar SA waters, 1 inch eventfor others) Design Volume 3. J) 4`_f c.f. % Drawdown Time days Basin Dimensions Basin Size 95 8. x JrZO sq. ft. (bottom dimensions) Basin Volume Provided 3 4ZG c.f. ? Basin Elevations Bottom Elevation 4. h fmsl Storage Elevation 6 .S fins) Top Elevation 7 o fmsl Form SWU-103 Rev 3.99 Page 1 of 3 1II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H A 008. Initial in the space provided to indicate that the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Storntwater Management Permit Application Form, the agent may initial below. Attach justification if a requirement has not been met. Applicants Initials eig� a. System is located 50 feet from class SA waters and 30 feet from other surface waters. c b. System is located at least 100 feet from water supply wells. 4, c. Bottom of system is at least 2 feet above the seasonal high water table. o, d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. e. System is not sited on or in fill material or DWQ approval has been obtained. f. System is located in a recorded drainage easement for the purposes of operation and maintenance and has recorded access easements to the nearest public right-of-way. CIA g. Drainage area for the device is less than 5 acres. h. Soils have a minimum hydraulic conductivity of 0.52 inches per hour and soils report is attached. i i. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event for areas draining to SA waters. ). Design volume and infiltration calculations attached. Ga(, j. System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining to the system, including any off -site drainage. Calculations attached. k. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V). I.• A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. in. Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches or dense vegetative cover is provided. eel n. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum length is 50 feet for SA waters, 30 feet for other waters). o. Flow distribution mechanism within the basin is provided. 6 p. A benchmark is provided to determine the sediment accumulation in the pretreatment device. q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided). r. System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days. A soils report and all pertinent draw -down calculations are attached. s. Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial operation once the project is complete and the entire drainage area is stabilized. Form SWU-103 Rev 3.99 Page 2 of 3 IV. INFD,TRATION BASIN OPERATION AND MAINTENANCE AGREEMENT l . After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion, trash accumulation, vegetative cover, and general condition. 2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetated cover to maintain a maximum height of six inches, and remove trash as needed. 3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow structures for blockage and deterioration. Remove any blockage and repair the structure to approved design specifications. 4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored to the original design depth without over -excavating. Over -excavating may cause the required water table separation to be reduced and may compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream, etc.). A benchmark shall be established in the pretreatment unit. The benchmark will document the original design depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the design depth reads feet in the pretreatment unit, the sediment shall be removed from both the pretreatment unit and the infiltration basin. 5. If the Division determines that the system is failing, the system will immediately be repaired to original design specifications. If the system cannot be repaired to perform its design function, other stonmwater control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed. 1 acknowledge and agree by my signature below that I am responsible for the performance of the five 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 and Title: %t✓+� W: <^lc i �� 1ntiLN� Address: 0.0. V, 100D yyxk,,,-VC 0 ,V C 2 -ts S Y 5— 64eu �1n1a4 /Vote: The legally responsible parry should not be a homemrners association unless more that? 50% of the lots have been sold and a resident of the subdivision has been named the president. j1, Cli o1 ee r W ? /% I QM,5 , a Notary Public for the State of 0, , County of "bnt-e , do hereby certify that Te " W lee.lei- personally appeared before me this�n' day of \J" /W , •4 ODI, , and acknowled^_e the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand %ei�,4i' &iila1e,l, t, - � , W C��e/� SEAL ` 'r• Form S\�;J-103 co My commission expires /1-4 -09 Pale 3 of 3 Pemut No (to be provided by DIV& State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM INFILTRATION BASIN SUPPLEMENT This form may be pho(ocopied for use as an original RECE0VIED JUL 1 7 2006 ®WQ-WARO DWO Stormwater Management Plan Review: A complete stonnwater management plan submittal includes a stonnwater management permit application, an infiltration basin supplement for each system, design calculations, soils report and plans and specifications showing all stormwater conveyances and system details. I. PROJECT INFORMATION Project Name : Na rr-zns SnrE&rn= OFF- cf Contact Person: CNr-T ['IAE_FZ F-wrr+i� Phone Number: (qIq )FEB -iF, This worksheet applies to: Basin No 2 (as id wifted on plmts) in Drainage Area i (from Form Sirv-101) I1. DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be based upon an actual field investigation and soil borings. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (finsl). a71�r.Fas... (file/owl Soils Report Summary y` r� / /' s - 3 " be /ww \RE Y 1=co Soil Type n r wE HND3,ou6p Infiltration Rate in/hr or cf/hr/sf (circle appropriate mats) SHWT Elevation Basin Design Parameters Design Storm Design Volume Drawdown Time Basin Dimensions Basin Size Basin Volume Provided Basin Elevations Bottom Elevation Storage Elevation Top Elevation 4.b fn1Sl (Seasonal High Water Table elevation) 3 inch (1.5 inch every far Sal waters, I inch event for others) 207 c.f. 7 days iti ft. x i. = 27t sq. f. (bonom dimensions) ° n c.f. 3 5 finsl 0 find 5 trust Forni SWU-103 Rev 3.99 Page 1 of 3 III. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department ofEnvironment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate that 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. Attach justification if a requirement has not been met. Applicants Initials 16 a. System is located 50 feet from class SA waters and 30 feet from other surface waters. b. System is located at least 100 feet from water supply wells. c. Bottom of system is at least 2 feet above the seasonal high water table. r,4_ d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. k1 e. System is not sited on or in fill material or DWQ approval has been obtained. f. System is located in a recorded drainage easement for the purposes of operation and maintenance and has recorded access easements to the nearest public right-of-way. Cae- g. Drainage area for the device is less than 5 acres. It. Soils have a m nimum hydraulic conductivity of 0.52 inches per hour and soils report is attached. i. System captures and infiltrates the runoff from the first 1.0 mch of rainfall (1.5 inch event for areas draining to SA waters ). Design volume and infiltration calculations attached. j. System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining to the system, including any off -site drainage. Calculations attached. k. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V). u,LY 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. in. Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches or dense vegetative cover is provided. c4 n. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum length is 50 feet for SA waters, 30 feet for other waters). o. Flow distribution mechanism within the basin is provided. C6 p. A benchmark is provided to detemtine the sediment accumulation in the pretreatment device. q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided). F. System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days. A soils report and all pertinent draw -down calculations are attached. cL s. Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial operation once the project is complete and the entire drainage area is stabilized. Fonn SWU-103 Rev 3.99 Page 2 of 3 IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT 1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion, trash accumulation, vegetative cover, and general condition. 2. Repair eroded areas inunediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetated cover to maintain a maximum height of six inches, and remove trash as needed. 3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow structures for blockage and deterioration. Remove any blockage and repair the structure to approved design specifications. 4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored to the original design depth without over -excavating. Over -excavating may cause die required water table separation to be reduced and may compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream, etc.). A benchmark shall be established in the pretreatment unit. The benchmark will document the original design depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the design depth reads feet in the pretreatment unit, the sediment shall be removed from both the pretreatment unit and the infiltration basin. 5. If the Division determines that the system is failing, the system will immediately be repaired to original design specifications. If the system cannot be repaired to perform its design function, other stonmwater control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed. I acknowledge and agree by my signature below that I am responsible for the performance of the five 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 and Title: ev✓ ec PN clo— h YA r"-t" Address: o , 30 x [ Utril Phone: 15t 475— $ Date: �1l 06 Signature Note: The legally responsible parry should not be a homeowners association unless more then 50% of the lots hm,e been sold and a resident of the subdivision has been named the president. , W r DiUP.rx"o , a Notary Public for the State of ��s , County of do hereby certify that T vn . %v%IG'?_�Pi— personally appeared before me this day of \,II ti{a DO , and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand d ado` VC34444[1,��,i CE�9 �.. •,.•UGC SEAL ^^ p Mycommissionexpires a OTAn c� . x�a �7 y. Form SWU-Ity3 Rev 31_,_� J w y�tJJ Page 3 of 3 y�' C' ®, •+• "ceeeeeaa'+°• zoos - M U L K E Y JUL ENGINEERS & CONSULTANTS ®WQ-1NARQ Infiltration Basins Supplement c. (Basin #2) From the geotechnical report, groundwater was encountered at elevation 4.5 nearest to Basin #2, aith the existing grade in this area of 5.0. Due to this fact, we increased the surface area and kept the basin as shallow as possible, with a depth of only 1.5'. f. No drainage easements have been recorded. The proposed on -site drainage will be private. h. The hydraulic conductivity is unknown at this time. 1. Filter strips were used to the greatest extent possible. However, the use of catch basins would create problems in trying to detain any stormwater runoff. The inverts of the pipes would be lower that what is necessary to outlet. o. Basin #1 utilizes a 6:1 length to width ratio in order to promote settling of any suspended solids. Basin #2 has a large surface area relative to the incom ng flow/velocity, also to encourage settling. q. No bypass structure has been provided. Again, this would mean that the stormwater must be captured in some type of stormwater piping network. This would drive the basins even deeper, which would create potential problems with the existing groundwater. Also, it would pose problems regarding oudetting the proposed basins. r. The attached current soils report does not include an infiltration rate. Therefore, draw -down calculations have not been provided. MULKEY INC. 6750 TRYON ROAD CARY. NO 27511 PO DO% 33127 RALEIGH. NO 27636 PH: 919-051-1912 FAX: 919-851-191a WWW.MULKEYINC.COM T �MULKEY ENGINE . EMS & CONSULTANTS:.- MMLKEY. INC. PO Box 33127, RALE113.. NC 27636-3127 919.135 , -1912 PAY Four Hundred Twenty. and 00/100 Dollars TO.'; NCDENR 1601 Mail Service Center Raleigh NC 27699 iWACHOVIA BANK, N:Af-- Z.. 66-21-530 I'm 0 0 0 C300 3113,10 1:0 S 3000 2 191: 20E. 25 30 7 1123 113 20 CHECK DATE' July,.7., 2006. AMOUNT $420.00 e �0--MULKEY ENGINEERS & CONSULTANTS P❑ Box 33127 RALEIGH, NC 27636 PHONE: 91 9-851 -1 91 2 FAx: 9 1 9-B 5 1- 1 9 1 B LETTER OF TRANSMITTAL RE>✓FIVEU JUL 17 2006 To: Roger Thorpe Date: July 14, 2006 NCDENR 934 Washington Square Mall Washington, NC 27889 " FEDERAL EXPRESS " Re: Hatteras Satellite Office Job No.: 2005354.00 I am sending you the following item(s): COPIES DATE NO. DESCRIPTION 2 Construction Drawing Set 2 Permit Application 2 Infiltration Basin Supplement 2 Infiltration Basin Supplement explanations 1 Calculations Package 1 7/7/06 60038 $420 check These are transmitted as checked below: ❑ As requested ❑ For your use ❑ For approval ❑ For Signatures ® For review and comment ❑ Remarks: Enclosed are the plans and Calculations for Hatteras Satellite Office. If you have any questions, feel free to call me at 919.858.1823. Copy to: Signed: `-� 447ti— Christopher A. Flythe, El SWid 0'"71� FINANCIAL RESPONSIBILITYIOWNERSHIP FORM SEDIMENTATION POLLUTION CONTROL ACT LQ No person may initiate any land -disturbing activity on one or more acres as covered by the Act before this form and an acceptable erosion and sedimentation control plan have been completed and approved by the Land Quality Section, N.C. Department of. Environment and Natural Resources. (Please type or print and, if the question is not applicable or the e-mail and/or fax information unavailable, place NIA in the blank.)— Part A. JUL 2 5 2006 1. Project Name Hatteras Satellite Office 2. Location of land -disturbing activity: County Dare City or Township Frisco V u u Q-WAR® Highway/Street 50346 NC Hwv 12 Latitude Longitude 3. Approximate date land -disturbing activity will commence: 8/06 4. Purpose of development (residential, commercial, industrial,. institutional, etc.): commercial 5. Total acreage disturbed or uncovered (including off -site borrow and waste areas): 2.10 AC 6. Amount of fee enclosed: $ 150.00 . The application fee of $50.00 per acre (rounded up to the next acre) is assessed without a ceiling amount (Example: a 9-acre application fee is $450). 7. Has an erosion and sediment control plan been filed? Yes No Enclosed X 8. Person to contact should erosion and sediment control issues arise during land -disturbing activity: Name David Clawson E-mail Address dayecCa7C0 dare nc us Telephone 252.475.5731 Cell # Fax # 252.473.5668 9. Landowner(s) of Record (attach accompanied page to list additional owners): County of Dare (David Clawson) 252.475.5731 252.473.5668 Name Telephone Fax Number 207 Budleich Street Current Mailing Address Current Street Address Manteo NC 27954 City State Zip City State ZIP 10. Deed Book Part B. Page No. Provide a copy of the most current deed. 1. Person(s) or firm(s) who are financially responsible for the land -disturbing activity (Provide a comprehensive list of all responsible parties on an attached sheet): Same as Landowner of Record Name E-mail Address Current Mailing Address City State cip Current Street Address City State Zip Telephone Fax Number 2. (a) If the Financially Responsible Party is not a resident of North Carolina, give name and street address of the designated North Carolina Agent: Name Current Mailing Address City Telephone State E-mail Address Current Street Address City State Zip Fax Number (b) If the Financially Responsible Party is a Partnership or other person engaging in business under an assumed name, attach a copy of the Certificate of Assumed Name. If the Financially Responsible Party is a Corporation, give name and street address of the Registered Agent: Name of Registered Agent Current Mailing Address E-mail Address Current Street Address City State Zip City State Zip Telephone Fax The above information is true and correct to the best of my knowledge and belief and was provided by me under oath (This form must be signed by the Financially Responsible Person if an individual or his attorney -in -fact, or if not an individual, by an officer, director, partner, or registered agent with the authority to execute instruments for the Financially Responsible Person). I agree to provide corrected information should there by any change in the information provided herein. U \1 r , `Ii Type or prin ame Signature C ou .ice rM e~ Title or Authority Date It1 Jb I, Janice" a Notary Publicof the County of bcre State of North Carolina, hereby certify that % i Me, /e4— appeared personally before me this day and being duly s orn acknowledged that the above form was executed by him. Witness my hand and not , valr Phis �r day of 20 0� Otq�A 0�fir,a� N�« ttbry Seal My commission expires u�L5v CO `0rerrerarrN° Permit 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 RLch.- LW INFILTRATION BASIN SUPPLEMENT This form may be photocopied for use as an original FEB 2 6 2007 DWO Stormwater Management Plan Review: ®WQ-WAR® A complete stonnwater management plan submittal includes a stonnwater management permit application, an infiltration basin supplement for each system, design calculations, soils report and plans and specifications showing all stonnwater conveyances and system details. I. PROJECT INFORMATION Project Name : ITA IEZAS SaT1=�-L,T[= 0T-F1cf Contact Person: CHtiison E FiLr-Hi= PhoneNmnber: (9iy ) 858-1823 This worksheet applies to: Basin No. Z in Drainage Area Z (as identified on plans) (from Form SWU-101) II. DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be based upon an actual field investigation and soil borings. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (f nsl). Soils Report Summary Soil Type Infiltration Rate SHWT Elevation Basin Design Parameters Design Storm Design Volume Drawdown Time Basin Dimensions Basin Size Basin Volume Provided Basin Elevations Bottom Elevation Storage Elevation Top Elevation Sr �S�tin 0.7S m/hr or cf/hr/sf (circle appropriate units) 5.l9 fmS1 (Seasonal High Water Table elevation) 11 S inch (1.5 inch event for SA waters, I inch event for others) IIoS c.f. 3 days ft. x 105 ft. = ZG 'Zi sq. ft. (bottom dimensions) Z, ZZZ= c.f. finsl fmsl fmsl Form SWU-103 Rev 3.99 Page 1 of 3 III. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate that 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. Attach justification if a requirement has not been met. Applicants Initials c�_ a. System is located 50 feet from class SA waters and 30 feet from other surface waters. L� b. System is located at least 100 feet from water supply wells. SE: Araci4 c. Bottom of system is at least 2 feet above the seasonal high water table. e-d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. e. System is not sited on or in fill material or DWQ approval has been obtained. See A m Nsn f. System is located in a recorded drainage easement for the purposes of operation and maintenance and has recorded access easements to the nearest public right-of-way. t f g. Drainage area for the device is less than 5 acres. c-r h. Soils have a minimum hydraulic conductivity of 0.52 inches per hour and soils report is attached. i. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event for areas draining to SA waters ). Design volume and infiltration calculations attached. f� j. System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining to the system, including any off -site drainage. Calculations attached. k. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V). 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. in. Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches or dense vegetative cover is provided. n. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum length is 50 feet for SA waters, 30 feet for other waters). o. Flow distribution mechanism within the basin is provided. p. A benchmark is provided to determine the sediment accumulation in the pretreatment device. SEE Arr Hen q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided). r. System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days. A soils report and all pertinent draw -down calculations are attached. s. Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial operation once the project is complete and the entire drainage area is stabilized. Form SWU-103 Rev 3.99 Page 2 of 3 IV. INFILTRATION BASIN OPERATION AND MAINTENACNCE AGREEMENT 1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion, trash accumulation, vegetative cover, and general condition. 2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetated cover to maintain a maximum height of six inches, and remove trash as needed. 3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow structures for blockage and deterioration. Remove any blockage and repair the structure to approved design specifications. 4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored to the original design depth without over -excavating. Over -excavating may cause the required water table separation to be reduced and may compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an appropriate nmanner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a stonnwater treatment device or stream, etc.). A benchmark shall be established in the pretreatment unit. The benchmark will document the original design depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the design depth reads feet in the pretreatment unit, the sediment shall be removed from both the pretreatment unit and the infiltration basin. 5. If the Division determines that the system is failing, the system will immediately be repaired to original design specifications. If the system cannot be repaired to perform its design function, other stonnwater control devices as allowed by NCAC 2H A000 must be designed, approved and constructed. I acknowledge and agree by my signature below that I am responsible for the performance of the five maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible parry. Print Name and Title: -�%— u k ea- eN Co— naa—,- -�. — Co ,rt�%� P_ o . m3ex i ou). Mkwice, "J t 7— y !Vote: The legally responsible parry should not be a hmnemcners association unless more than 50% of the lots have been sold and a l rc.rident of the subdivision has been named the pi esident. I, �l nntrPa W t Q.Q(LlAwJ , a Notary Public for the State of /ref , County of do hereby certify that J9vn i w!Ie'�IEi— _._ personally appeared before me this day of 00(, , and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand and,,=QFia4ml,If �n A 'ro �. w CLC11 640 SEAL �� 59,.f_', My commission expires ®TAR 7�'s yea `10 Fame SWU ®Ijl3 Rev . 91B 1. �`) Page 3 of 3 ++++ CU +ceee.asae 0-MULKEY ENGINEERS $ CEINSULTANTS Infiltration Basins Supplement Infiltration Basin #2 c. The bottom of the system is -1.31' above the seasonal high water table. Per comments, a minimum of 1'-2' is required above seasonal high water table in order for approval. f. Since Dare County owns the land, and is responsible for maintenance, no easements are required. q. As discussed, no bypass structure is provided. However, instead of the 1.5" rainfall volume, double that amount will be infiltrated in Basin #2. MULKEY INC. 6750 TRYON ROAD CARY. NO 27511 PC BO% 33127 RALEIGM, NO 27636 PH: 919-853-1912 FP%: 919-EI51-19113 WWW.MLILKEYINC.CGM Permit 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 MEoVED INFILTRATION BASIN SUPPLEMENT FEB 2 6 2007 This form may be photocopied for use as an original DWQ Stormwater Management Plan Review: DWQ-F AR® A complete stormwater management plan submittal includes a stormwater management permit application, an infiltration basin supplement for each system, design calculations, soils report and plans and specifications showing all stormwater conveyances and system details. I. PROJECT INFORMATION Project Name: ; {q„EtiFls rrs O Ftce Contact Person: C r,,: i s—cpliE c f-�yrtl E Phone Number: (q iR -1 u Z 3 This worksheet applies to: Basin No. 3 in Drainage Area 3 (as identified on plans) (from Form SWU--101) II. DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be based upon an actual field investigation and soil borings. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Soils Report Summary Soil Type Infiltration Rate SHWT Elevation Basin Design Parameters Design Storm Design Volume Drawdown Time Basin Dimensions Basin Size Basin Volume Provided Basin Elevations Bottom Elevation Storage Elevation Top Elevation O, 7S in/ or cf/hr/Sf ,(circle appropriate units) 3 16 fmsl (Seasonal High Water Table elevation) 1 S inch (1.5 inch event for SA waters, I inch event for others) Z, I81 c.f. I.5 days i ft. x g , 7 S ft. = 1, 313 4,530 c.f. 4.5 fmsl 6,75- fmsl 7, o finsl ft. (bottom dimensions) Form SWU-103 Rev 3.99 Page 1 of 3 HL REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate that 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. Attach justification if a requirement has not been met. Applicants Initials a. System is located 50 feet from class SA waters and 30 feet from other surface waters. e,� b. System is located at least 100 feet from water supply wells. SA c. Bottom of system is at least 2 feet above the seasonal high water table. << d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. S C. System is not sited on or in fill material or DWQ approval has been obtained. f. System is located in a recorded drainage easement for the purposes of operation and maintenance and has recorded access easements to the nearest public right-of-way. 664- g. Drainage area for the device is less than 5 acres. h. Soils have a minimum hydraulic conductivity of 0.52 inches per hour and soils report is attached. i. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (I.5 inch event for areas draining to SA waters ). Design volume and infiltration calculations attached. j. System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining to the system, including any off -site drainage. Calculations attached. k. All side slopes stabilized with vegetated cover are no steeper than, 3:1 (H:V). 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. in. Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches or dense vegetative cover is provided. n. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum length is 50 feet for SA waters, 30 feet for other waters). o. Flow distribution mechanism within the basin is provided. p. A benchmark is provided to determine the sediment accumulation in the pretreatment device. c-,4 �,N q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided). r. System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days. A soils report and all pertinent draw -down calculations are attached. s. Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial operation once the project is complete and the entire drainage area is stabilized. 5;A = 5£c AT Ac E� Form SWU-103 Rev 3.99 Page 2 of 3 IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT 1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion, trash accumulation, vegetative cover, and general condition. 2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetated cover to maintain a maximum height of six inches, and remove trash as needed. 3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow structures for blockage and deterioration. Remove any blockage and repair the structure to approved design specifications. 4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored to the original design depth without over -excavating. Over -excavating may cause the required water table separation to be reduced and may compromise the ability of the system to perform as designed. Removed sedunent shall be disposed of in an appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream, etc.). A benchmark shall be established in the pretreatment unit. The benchmark will document the original design depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the design depth reads feet in the pretreatment unit, the sediment shall be removed from both the pretreatment unit and the infiltration basin. 5. If the Division determines that the system is failing, the system will immediately be repaired to original design specifications. If the system cannot be repaired to perform its design function, other stonnwater control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed. I acknowledge and agree by my signature below that I am responsible for the performance of the five 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 and Title: 1 4 CN C-0 ^ ^ �Y\ c" Address: ol/ Ca -n o. Phone: C� St� 97f— $ Date:_ 7106L Note: The legally responsible parry should not be a homeowners association unless more than 50% of the lots hm,e been sold and a l resident of the subdirrsion has been named the president. I, 0 mtC2 W t hfi,. XA , a Notary Public for the State of Nei , County of do hereby certify that T .m WhP-PiCI— personally appeared before me this day of Q00t, , and acknowledge the due execution of the forgoingp itn�filtration basin maintenance requirements. 10 Witness my hand and a,j6j169�`ilito n ,� LJ i�C. um� ^O SEAL ,�i ���� My commission expires a OT A&� v 6t1p e . Form SWU +1"g3 Rev 3.59r'3 p—\�� Page 3 of 3 °Ff+cceaeaaao°� MULKEY ENGINEERS & CC7N5UL.TANTS Infiltration Basins Supplement Infiltration Basin #3 c. The bottom of the Basin is —1.14' above the seasonal high water table. As discussed in the comments, permitting is possible with a mimmuin of 12-24" of clearance between the bottom of the basin, and the seasonal high water table. f. Since Dare County owns the land, and is responsible for maintenance, no easements are required. q. As discussed, no bypass structure is provided. However, instead of the 1.5" rainfall volume, greater than 2 times that amount will be infiltrated in Basin #3. MOLKEY INC. 6750 TRYON ROAD CARY. NC 27511 PC Box 33129 RALEIDr, NC 27636 PH: 919-851-1912 FA,: 919-851-1918 www.NULKEvwc.cDN Permit 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 INFILTRATION BASIN SUPPLEMENT RECEM EVE This form may be photocopied for use as an original FEB 2 S 2007 DWO Stonmwater Management Plan Review: (� IA�<l A complete stormwater management plan submittal includes a stormwater manager er permi p[�lication, an infiltration basin supplement for each system, design calculations, soils report and plans and specifications showing all stormwater conveyances and system details. I. PROJECT INFORMATION Project Name : < nracE Contact Person: C Hgts7aPl+En' Inc Phone Number: ('rill' This worksheet applies to: Basin No .1 (as identified on plans) in Drainage Area 1 (from Form SWU-101) II. DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be based upon an actual field investigation and soil borings. County soil maps are not an acceptable source of soils infonnation. All elevations shall be in feet mean sea level (fmsl). Soils Report Summary Soil Type 2Y -�'w> Infiltration Rate in/ or cf/hr/sf (circle appropriate units) SHWT Elevation 2). 1 % flnsl (Seasonal High Water Table elevation) Basin Design Parameters Design Storm Design Volume Drawdown Time Basin Dimensions Basin Size Basin Volume Provided Basin Elevations Bottom Elevation Storage Elevation Top Elevation I ' 7 inch (1.5 inch event for SA waters, I inch event for others) 1, 133 c.f. days q,Z ft. x 5 3 ft. _ 4,876 sq. ft. (bottom dimensions) S7 c.f. S,17 finsl 5.9Z finsl 6.)7 finsl Form SWU-103 Rev 3.99 Page 1 of 3 III. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate that 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. Attach justification if a requirement has not been met. Applicants Initials a. System is located 50 feet from class SA waters and 30 feet from other surface waters. b. System is located at least 100 feet from water supply wells. c. Bottom of system is at least 2 feet above the seasonal high water table. e d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. e. System is not sited on or in fill material or DWQ approval has been obtained. '-A f. System is located in a recorded drainage easement for the purposes of operation and maintenance and has recorded access easements to the nearest public right-of-way. 4 g. Drainage area for the device is less than 5 acres. w� h. Soils have a minimum hydraulic conductivity of 0.52 inches per hour and soils report is attached. cf i. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event for areas draining to SA waters ). Design volume and infiltration calculations attached. e, j. System is sized to take into account the runoff at the ultimate built -out potential from all surfaces draining to the system, including any off -site drainage. Calculations attached. k. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V). c=,21. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. in. Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches or dense vegetative cover is provided. Cc D. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum length is 50 feet for SA waters, 30 feet for other waters). c o. Flow distribution mechanism within the basin is provided. p. A benchmark is provided to determine the sediment accumulation in the pretreatment device. 1 q. Runoff in excess of the design volume bypasses off-line systems (bypass detail provided). /', 2 r. System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days. A soils report and all pertinent draw -down calculations are attached. c s. Plans ensure that the installed system will meet design specifications (constructed or restored) upon initial operation once the project is complete and the entire drainage area is stabilized. S1 _ SEE AnAcrlE> Form SWU-103 Rev 3.99 Page 2 of 3 IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEIMENT 1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion, trash accumulation, vegetative cover, and general condition. 2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetated cover to maintain a maximum height of six inches, and remove trash as needed. 3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow structures for blockage and deterioration. Remove any blockage and repair the structure to approved design specifications. 4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored to the original design depth without over -excavating. Over -excavating may cause the required water table separation to be reduced and may compromise the ability of the system to perform as designed. Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream, etc.). A benchmark shall be established in the pretreatment unit. The benchmark will document the original design depth so that accurate sediment accumulation readings can be taken. The measuring device used to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the design depth reads feet in the pretreatment unit, the sediment shall be removed from both the pretreatment unit and the infiltration basin. 5. If the Division determines that the system is failing, the system will immediately be repaired to original design specifications, If the system cannot be repaired to perform its design function, other stonnwater control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed. I acknowledge and agree by my signature below that I am responsible for the performnance of the five 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 and Title: c,-!b lJA—lc� yl1cis.w�v Address: P.O. V,, 10oD YV% ka SY phnner ( Z 5 L) (V? 5- S Iq p u _ Date: 1 n l a C. Note: The legabi, responsible pm pr should not be a homeowners association unless more than Al$o of the lots have been sold and a jj resident of the subdivision has been named the president. 11 I. 011I CC j—, . 0 i /I 16 M,5 , a -\Notary Public for the State of 1�f Q� County of do hereby certify that Lpe2, �Elr personally appeared before me this day of �, .2W , and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand `6 (4'ktF``if�i9"t SEAL Y!z. My commission expires�� y. Font S1k�1-103 R wo.� Page 3 of 3 G C\ S4 l i -0-MULKEY ENGINEERS & CONSULTANTS Infiltration Basins Supplement Infiltration Basin #1 f. Since Dare County owns the land, and is responsible for maintenance, no easements are required. y. As discussed, no bypass structure is provided. However, instead of the 1.5" rainfall volume, nearly quadruple that amount will be infiltrated in Basin #1. MULKEY INC. 5750 TRYON ROAD C.ARY. NC 27511 PC Box 33129 RALEIGH. NC 27636 PH: 91 9-851-191 2 FAX: 919-851-1916 www.MULKEYINC.CMM OFFICE USE ONLY Date Received Fee Paid Permit Number 2-7,- D 0 6 p 7/Z.- State of North Carolina \ Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM �b�—a-N% This form may be photocopied for use as an original I. GENERAL INFORMATION FEB 2 6 2007 1. Applicants name (specify the name of the corporation, individual, etc. who owns the prcject))WQ"WAR0 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): (cRtiy iJHF=LSiZ , t7v^ry nC7yr2 3. Mailing Address for person listed in item 2 above: 'ziI � S,fiecT City: MAIT—Ed State: NC. Zip: 27954 Telephone Number: ('Z5Z )-475'Sg00 4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): )�A �ti�NS �Y�7 rGC i'rf �Fi= tCc 5. Location of Project (street address): 5 G 34 & A/C P WY City: i7e i S co County: 6. Directions to project (from nearest major intersection): L'�- AC. C, lye //'vy /Z riZar7 Siy.�,cSrc nnn, 7. Latitude: >50 i5i ',6" n/ Longitude: 76' 34' t✓ of project 8. Contact person who can answer questions about the project: Name: C 5 it/' E/ yTy _ Telephone Number: ( q I 1 ) II. PERMIT INFORMATION: 1. Specify whether project is (check one): New Renewal Modification Form SWU-101 Version 3.99 Page 1 of 4 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number and its issue date (if known) 3. Specify the type of project (check one): Low Density ✓ High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): CAMA Major ✓Sedimentation/Erosion Control 404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. SNCi;' (- v,•/ IS VIIL,Z6:� T ] Hv 2. Stormwater runoff from this project drains to the PASQL)orANK River basin. 3. Total Project Area: A .3 acres 4. Project Built Upon Area: 24. 1 % our OF zs.9b is AL /{-c.z6j 5. How many drainage areas does the project have? g 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Basin Information Drainage Area L r ' Drainage Area 2: -. Receiving Stream Name I"AMLI(O SevN'J �M ILO Receiving Stream Class 5A 14 0 t,, SA 9 6, Drainage Area O, Ac O, Existing Impervious` Area Q5 Proposed Impervious'Area 0 eog 0,Z03 % Impervious" Area (total) 'L 4- i = 4 , 4 0 4 S 3 ImperviousSurface Area, Drainage Area I Drainage Area 2 . On -site Buildings D oZo Ac — On -site Streets o . .0 0,077 On -site Parking 0 , O31 p.lo5' On -site Sidewalks 0, 017 D •o LI Other on -site — — Off -site Total: �,Z g Total: 0 -Lo3 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 Basin Information Drainage Area 3 Drainage Area 4 Receiving Stream Name Pamlico Sound Pamlico Sound Receiving Stream Class SA; HOW SA; HQW Drainage area 0.604 AC 0.093 AC Existing Impervious Area 0.000 AC 0.019 AC Proposed Impervious Area 0.401 AC 0.024 % Impervious Area (total) 66.39% 46.02% Impervious Surface Area Drainage Area 3 Drainage Area 4 On -site buildings 0.140 AC 0.000 AC On -site streets 0.075 AC 0.023 AC On -site parking 0.151 AC 0.001 AC On -site sidewalks 0.035 AC 0.000 AC Other on -site 0.000 AC 0.000 AC Off -site 0.000 AC 0.019 AC Total: 0.401 AC 0.043 AC Basin Information Drainage Area 5 Drainage Area 6 Receiving Stream Name Pamlico Sound Pamlico Sound Receiving Stream Class SA; HQW SA; HQW Drainage area 0.245 AC 0.437 AC Existing Impervious Area 0.000 AC 0.071 AC Proposed Impervious Area 0.021 AC 0.063 AC % Impervious Area (total) 8.57% 30.66% Impervious Surface Area Drainage Area 5 Drainage Area 6 On -site buildings 0.000 AC 0.000 AC On -site streets 0.013 AC 0.052 AC On -site parking 0.008 AC 0.009 AC On -site sidewalks 0.000 AC 0.002 AC Other on -site 0.000 AC 0.000 AC Off -site 0.000 AC 0.071 AC Total: 0.021 AC 0.134 AC Basin Information Drainage Area 7 Drainage Area 8 Receiving Stream Name Pamlico Sound Pamlico Sound Receiving Stream Class SA; HQW SA; HQW Drainage area 1.300 AC 1.107 AC Existing Impervious Area 0.000 AC 0.000 AC Proposed Impervious Area 0.000 AC 0.000 AC % Impervious Area (total) 0.00% 0.00% Impervious Surface Area Drainage Area 7 Drainage Area 8 On -site buildings 0.000 AC 0.000 AC On -site streets 0.000 AC 0.000 AC On -site parking 0.000 AC 0.000 AC On -site sidewalks 0.000 AC 0.000 AC Other on -site 0.000 AC 0.000 AC Off -site 0.000 AC 0.000 AC Total: 0.000 AC 0.000 AC 7. How was the off -site impervious area listed above derived? R/L7 % rA� S v�v- v ;'/ 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 4 VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. 1. Please indicate that you have provided the following required information by initialing in the space provided nextto each item. Initials Original and one copy of the Stormwater Management Permit Application Form _( AF One copy of the applicable Supplement Form(s) for each BMP CAF Permit application processing fee of $420 (payable to NCDENR) CAF Detailed narrative description of Stormwater treatment/management CAF Two copies of plans and specifications, including: CAF - Development/Project name - Engineer and firm -Legend - North arrow - Scale Revision number & date Mean high water line Dimensioned property/project boundary Location map with named streets or NCSR numbers Original contours, proposed contours, spot elevations, finished Floor elevations Details of roads, drainage features, collection systems, and stormwater control measures Wetlands delineated, or a note on plans that none exist Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations Drainage areas delineated Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or finn):�,VL -)' EALC7 vrr=PS `� �NSr'�rn�✓TS Mailing Address: 6-7'0 'TKy,>N tioAD Phone: (gig ) 87S'IE7-3 VIII. APPLICANT'S CERTIFICATION State: A/ C Zip: Z75) 1 Fax: ( Q19 ) '6�S:)-MfA 1, (print or type narne of person listed in General Information, item 2) 1-Ore-1 k/J \,« `ew certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC 21-1 .1000. Date: r /- // -0b Fonn SWU-101 Version 3.99 Page 4 of 4