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HomeMy WebLinkAboutSW7050606_CURRENT PERMIT_20050908STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPECURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE DOC DATE a&sogvg' YYYYMMDD o�oF w a r�gQG �-� v Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources DIVISION OF WATER QUALITY September 8, 2005 Nags Head Church, Inc. Attn: Mr. Bruce Copeland PO Box 302 Nags Head, NC 27959 Subject: Dear Mr. Copeland: Alan W. Klimek, P.E. Director Division of Water Quality Stormwater Permit No. SW7050606 Nags Head Church High Density Stormwater Project Dare County The Washington Regional Office received your completed Stormwater Application for the subject project on August 8, 2005. 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. SW7050606 dated September 8; 2005 to Nags Head Church, Inc. This permit shall be effective from the date of issuance until September 8, 2015 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 ddjudicatory 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: h2c.enr,state.nc.us 943 Washington Square Mall Phone; 252-946-6481 Washington, NC 27889 FAX 252-946-9215 An Equal OpportunitylAffirmadve Action Employer— 50% Recycled110% Post Consumer Paper Nne orthCarolina Naturally Nags Head Church, Inc. September 8, 2005 Page Two If you have any questions, or need additional information concerning this matter, please contact Mr. Bill Moore at (252)948-- 3919. Acerel , L Al Hodge, R al upervisor Surface Water Protection Section Washington Regional Office cc: Albemarle & Associates Town of Nags Head Planning/Inspections ti/WARO Stormwater Files Central Files State Stormwater Management Systems Permit No. SW7050606 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 Nags Head Church, Inc. Dare County FOR THE construction, operation and maintenance of stormwater 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 (2) infiltration basins to serve Nags Head Church located off Sound Side Road at Nags Head, NC. This permit shall be effective from the date of issuance until September 8, 2015, 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 4 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: R Nags Head Church SW7050606 Dare County Nags Head Church, Inc. PO Box 302 Nags Head, NC 27959 06/06/2005 UT -Roanoke Sound SA 2.43 acres 1.08 acres 1.75 - Basin 1 1.25 - Basin 2 3410 cf - Basin 1 3126 cf - Basin 2 3540 cf - Basin 1 3212 cf - Basin 2 3959 sf - Basin 1 3518 sf -- Basin 2 5.33 ft - Basin 1 5.58 ft - Basin 2 n 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 site 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 I. 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 if 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 ,oapplication 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 14.3-215.6(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 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 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. Permit issued this the 8 th day of September, 2005. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Alan W. li DirectorJ Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW7050606 7 Stormwater Permit SW7050606 (2) Infiltration Basins Nags Head Church, Sound Side Road Nags Head, NC Designer's Certification I, as a duly 0 registered Professional Engineer 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. Signature Registration Number Date 3 Stormwater'Permit SW7050606 (2) Infiltration Basins Nags Head Church, Sound Side Road Nags Head, NC Designer's Certification r, Jo"A.) W.`_�Ljcm , as a duly registered Professional Engineer in the State of North Carolina., havina been authorized to observe (periodically/weeIJI-c full time) the construction of the project, IJA ged . (Project) 1 for 9trA1 (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 then gent truction was o erved to be built within substantial complice and i of the approved plans and specifications. 11. Signature —1 f 'U Registration Jer SEAL Date 4 n M. i 0 I lbemarle & ASSOCIATES, LTD. May 9, 2007 North Carolina Department of Environment and Natural Resources/Uht Washington Regional Office 943 Washington Square Mall Washington, NC 27889 ATTN: Scott Vinson RE: Stormwater Permit SW7050606 Nags Head Church, Sound Side Road, Nags Head, Dare County, NC Dear Mr. Vinson: Please find enclosed the Stormwater Permit Designer's Certification. Based upon this review, I find that this facility was constructed in substantial compliance with the plans that were approved by the State. If I can provide any additional information, please do not hesitate to call. Sin(*rely, btTh M. DeLucia, PE rinciple Engineer Enc. JMDlarm cc: File 7356A Client Engineering — Surveying -- Land Planning P.O. Sox 3969, 115 W. Saint Clair St., Kill Devil Hills, NC 27948 Telephone: 252-441-2113 Fax: 252-441-0965 State of North Carolina i� Department of Environmental and Natural Resources �"`�°'r � Division of Water Quality OFFICE USE: ONLY Date Received i Fee Paid Permit Number SOCK &/11/0-5- JUN 0 6 2005 STORMWATER MANAGEMENT PERMIT APPLICATION FORM 11 This form may be photocopied for use as an original ` h / /•r��S7�y� We- All 1. GENERAL INFORMATION ga t 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): Nags Head Church, Inc. 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Mr. Bruce Copeland. Buildina Team Leader 3. Mailing Address for person listed in item 2 above: P.O. Box 302 City: Nags Head State: NC Zip: 27959 Telephone Number: 252441-7548 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Nags Head Church 5. Location of Project (street address): 105 Sound Side Road City: Nags Head County: Dare 6. Directions to project (from nearest major intersection): From the intersection of US158 and US64 proceed 3.9 miles to the north to Sound Side Road. Turn west on Sound Side Road. site is on the left. 7. Latitude: 35' 57.44'N Longitude: 75' 37.59'W 8. Contact person who can answer questions about the project: Name: Mr. Jared L. Madewell, PE Telephone Number: If. PERMIT INFORMATION: 1. Specify whether project is (check one): X New Renewal Form SWU-101 Version 3.99 Page I of of project 252) 1-21 13 Modification I Ki 1 i i ,• r 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 X Redevelop General Permit _ Other 4. Additional Project Requirements (check applicable blanks): CAMA Major X 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. Ill. 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. The existing stormwater management basin will continue to be used for Drainage Area 1. A new infiltration basin will be constructe d on the west side of the property for Drainage Area 2. An overflow bypass device will be built to bypass runoff above 2" into an adjacent conveyance ditch. 2. Stormwater runoff from this project drains to the Pasquotank River basin. 3. Total Project Area: 2.4 Acres 4. Project Built Upon Area 5. How many drainage areas does the project have? 2 44.4 % 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 See Attached Sheet See Attached Sheet Receiving Stream Class Drainage Area Existing Impervious* Area Proposed Impervious* Area % Impervious* Area (total) Impervious* Surface Area Drainage Area I Drainage Area 2 On -site Buildings See Attached Sheet See Attached Sheet On -site Streets On -site Parking On -site Sidewalks Other on -site Off -site Total: Total: ' Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form SWU-101 Version 3.99 Page 2 of 4 7. How was the offsite Impervious area listed above derived? IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all Subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot number, size and the 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, hrick. stone, slate, or similar material but do not include wood decking or the water surface of swimming pools. 3. .Swales shall not he felled 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 runofffrom outparcels orfuture development shall he 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 S W U-101 Version 3.99 Page 3 of 4 V1. SUBMITTAL REQUIRMENTS 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 he Submitted to the appropriate DWQ Regional Office. 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. • Original and one copy of the Stormwater Management Permit Application Form X • One copy of the applicable Supplement Form (s) for each BMP X • Permit application processing fee of$420 (payable to NCDENR) X • Detailed narrative description of stormwater treatment/management X • Two copies of plans and specifications, including: X - 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 AUTORIZATION 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 of firm): Albemarle & Associates, Ltd. - Mr. Jared L. Madewell, PE Mailing Address: P.O. Box 3989, 115 West St. Clair Street City Kill Devil Hills State: NC Zim 27948 Phone: (252)441-2113 Fax: (252)441-0965 Vill. APPLICANT'S CERTIFICATION I, (print or type name ofperson listed in General Information, item 2) Mr. Bruce Copeland 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 2H.1000. Signature:_ _ Date: k a Farm SWU-l0l Version 3.99 Page 4 of 4 DRAINAGE AREAS for the NAGS HEAD CHURCH Basin`Inforiilatibna,?�� v?; Yti a;F ` D�air a e'Area;1: # Drains e�Areat2 k; Receiving Stream Name Roanoke Sound Roanoke Sound Receiving Stream Class HQW HQW s (Ac) (s Ac Drainage Area 61,400 1.41 44,617 1.02 Existing Impervious Area 28,603 0.66 1,401 0.03 Proposed Impervious Area 24,785 0.57 22,299 0.51 % Impervious Area 40.4% 50.0% lm 'eNious'�Surface"Area`sw . -' ;Drama a Area 1; .' ;Draina a Area 2t On -Site Buildings 0 0,00 10,288 0.24 On -Site Streets 0 0.00 0 0.00 On -Site Parking 21,704 0.50 11,094 0.25 On -Site Sidewalks 3,081 0.07 917 0.02 Other On -Site 0 0.00 0 0.00 Off -Site 0 0.00 0 0.00 Total: 24,785 0.57 22,299 0.51 Site Area 2.43 AC Existing Coverage 28.3% Proposed Coverage 44.4% r,o b JUN 0 6 20J5 DWQ-WARQ Prepared by Albemarle & Associates, Ltd. 5/26/2005 STORMWATER NARRATIVE for the NAGS HEAD CHURCH in NAGS HEAD, NORTH CAROLINA RECEOVED JUN 0 6 2005 OWQ-WARO The congregation of the Nags Head Church intends to construct a new church on a site with an existing structure that will be removed upon completion of the new structure. The proposed church has a footprint of 10,040 SF. The site is located on 2.43 acres on the southwest corner of the intersection of Sound Side Road and US158. A portion of the site is currently developed with a structure containing a chapel, administrative offices, classrooms, concrete parking, and sidewalks. The site is reasonably level with trees on the undeveloped portion of the property. The Soil Survey for Dare County has mapped the soils to consist of NuC (Newhan-Urban) and NhC (Newhan-Corolla) with the majority of the site being Newhan-Corolla. Both complexes are characterized by very rapid permeability with rates in excess of 20 inches per hour. Elevations range from just under 2.0 MSL to approximately 7.0 MSL. The lowest elevations that are not part of an existing stormwater management device are around 4.0 MSL. Overall coverage for the site is 44.4%. There are two (2) drainage areas. The Town of Nags Head requires that the site manage the stormwater runoff from a 2" storm event which exceeds the required 1.5" for SA waters. Drainage area I includes the eastern one-half of the site. It consists of all of the existing parking and sidewalk and a small portion of the new parking and sidewalk. Coverage for Drainage Area I is being reduced from its current state. Drainage Area 2, to the west, includes the new church and the majority of the new parking. Runoff from Drainage Area 1 currently enters an infiltration basin where it infiltrates into the soil. Excess runoff overflow5Ahrough a devic an existing NCDOT conveygaojiLch adjacent to the basin. Upon I 'on of the project and a resulting reduction in coverage, the basin in Dra' e Area I.Lvill manage 3.5 inches f rainfall through storage and infiltration. The basin is managing stormwater very well and t e a orementioned reduction in coverage will benefit its oterat' n. A ictu is included of the basin showing its existing vegetated state and overflow device. infiltration basi will be installed in the western portion of the site for Drainage Area 2. Roof runoff will be conveyed to the basin via building gutters and buried pipes. Sidewalk and parking runoff ill sheet flow to the in. The resu[tin la out of Infiltration Bain 2 results in the management of a 3" rain event through storage an infiltratio . A by a ill be con cted on the sou a asm so that excess runoff is erected to a relocated portion of the D T conveyance ditch adjacent to the swale. A soil boring was taken to estimate the depth to the water table in the vicinity of the proposed infiltration area. The boring was representative of the Newhan-Urban complex. The depth to the water table determined thr this boring was 42" below the existing grade, which would equate to an elevation at approximate) 3.5' SL. \� Ht yCA I? says z� E Prepared by Albemarle & Associates, Ltd 5/27/2005 ti STORMWATF R CALCULATIONS for the NAGS HEAD CHURCH Stormwater Drainage Ar #1 xisting Parking and Portion of Proposed Parking and Sidewalk) Drainage Area 61,400 sf = 1.41 ac Sbf FACE AREA INFORMATION C.A,-is*_,' Sidewalks (Existing) 0.95 1,784 1,695 Sidewalks (Proposed) 0.95 1,297 1,232 Pavement (Existing) 0,95 20,182 19,173 Pavement (Proposed) 0.95 1,522 1,446 Building 1.00 0 0 Total Impervious 24,785 23,546ry Stoririwiiter;Mariii�ement'Area's"�;_' ''�: CoValue+:,:"`µ;NksArea{L':,.�::'��.C',!A:'°e. Infiltration Basin 1,00 2,960 2,960 /2,960 Total Stormwaler Management Area 2,960 Total Contributing Area 27,745 26,506 Infiltration Basin Characteristics 0����f 0299 f 'Ofll i,1 MAW \V" 70 9. IRV Stormwater Management 1" 1.5" 2.1 3.5" Intensity (in./hr) 0.5 0.75 1.0 1.75 Runoff (cfs) 0.30 0.46 0.61 1.06 2-1-lour Runoff Volume (cf) 2,191 ^ 3,286 4,381 7,667 Pond Storage Volume (cf) 2,889 2,888 2,888 2,888 Pond/Swale Infiltration Volume (cf)drw-� ? 4,933 4,933 4,933 4,933 Void Volume Under Pond (cf) 0 0 D 0 Total Stormwater Managed (el) 7,821 + 7,821 7,821 7,821 Percent Retained 357% 238% 179% 102% * Stormwater falling upon the drainfield and perimeter areas with greater than two feet separation excluded from calculations due to the porosity of existing conditions. *" - based on two hour infiltration rate. Prepared by Albemarle & Associates, Ltd. 5/26/2005 STORMWATER CALCULATIONS for the NAGS HEAD CHURCH Stormwater Drainage Are #2 Proposed Building, Sidewalk, and Parking) Drainage Area 44,6I7 sf = 1.02 ac SURFACE AREA INFORMATION ImprenousSurfact ,a.-._•�„-,,.n::_sti� ,,,�y.,. s:C,Valut,s"rx.�zAi'ea.�.-.,.:_.c�"iC,Ax4't,..,, 0.95 0 0 Sidewalks (Existing) Sidewalks (Proposed) 0.95 917 71 Pavement (Existing) 0.95 0 0 Pavement (Proposed) Building 0,539 1.00 10,2880,288 0.95 11,094/21,698 Total Impervious Area 22,299 Infiltration Basin Loo 2,841 12,841 Total Stormwater Managemeot Area 2,841 2,841 Total Contributing Ar� 25,140 24,539 Infiltration Basin Characteristics ox� ICAR O�"/ A Stormwater Management I !, Is. 2" 3" Intensity (in./hr) 0.5 0.75 1.0 1.5 Runoff (cfs) 0,28 ` 0.42 0.56 0.85 2-Flour Runoff Volume (ct) 2,0281 3,042 4,056 6,084 Pond Storage Volume (cf) ,7 2,390 :2,390 2,390 2,390 Pond/Swale infiltration Volume r 4,735 --} 4,735 4,735 4,735 Void Volume Under Pond (ef) 0 \0 0 0 Total Stormwater Managed (co 7,125 7,125 7,125 7,125 Percent Retained 351% 234% 176% 117% ' - Stormwater falling upon the drainfield and perimeter areas with greater than two feet separation excluded from calculations due to the porosity of existing conditions. - based on Iwo hour infiltration rate. Z6 7/ .r Z 39v CT ARediA Preapred by Albemarle & Associates, Ltd. 5/26/2005 Soil Boring for Nags Head Church Soil Boring depth -1 0" - 2" root mat 2„ -12" dry fine brown sand 12" - 30" tan slightly moist fine sand slightly moist 30" - 33" coarse reddish brown sand moist fine sand 33" - 42" wl woody organics >42„ wet fine sand wl woody organics Depth to Water Table 35 Surface Elev 6.00 Appx. WT Elev 2.50 Albemarle & Associates, Ltd. 6/3/2005 .. ... IAM f' •�'X` tip''. ',,�rf9.1; l'u�gp' } 6� . ti { '• 1r X`' - �4o?r�R"336�� ri It > >..,�� •..+ti d �� .'ba.+ ` v�' ��,f �rU,.ii fly ��;:, t 7 /}/ rl ��a � � �s3.`,:�41i.:� •'i �`:•{��+n �'',�It f.�`'T1'd�,�+ Iy j' f�1 1�� '�y,,�fk7 , 53,'''r{,y>� k"�" i�r�?�� IY L:4� ,•�� ''%'` �'.! � 4�° .. �t�:1 +Aq: I lbemarle & ASSOCIATES, LTD. June 3, 2005 NCDENR Land Quality Section 943 Washington Square Mall Washington, NC 27889 ATTN: Mr. William Moore, PE RE: The Nags Head Church Dear Mr. Moore: RECE 11V L, JUN 0 6 2005 DWQ-WARO Please find the enclosed Stormwater Management submittal for the Nags Head Church. The owner intends to begin construction on the site in the fall of 2005. The project is a redevelopment of an existing religious complex. The owner intends to renovate the site by constructing a new building and installing new pavement to supplement existing parking. The existing site currently has stormwater management as discussed in the enclosed narrative. We are proposing to manage stormwater through two (2) infiltration basins, one (1). existing and one (1) proposed. The site has an outlet that is tied by swales to an existing outfall into the Roanoke Sound. Enclosed with this submittal are the Grading and Drainage Plans, applicable application forms, fee, and supporting data and calculations for this work. Please do not hesitate to call me if you have any comments or questions regarding this project. Sincerely, Jared L. Madewell, PE Project Engineer Attachments cc: File Nags Head Church Cahoon & Kasten Architects (Ltr. Only) Engineering — Surveying — Land Planning P.O. Box 3989, 115 W. Saint Clair St., Kill Devil Hills, NC 27948 Telephone: 252-441-2113 Fax: 252-441-0965 The Nags Head Church LR ECE0E.L) Stormwater Management Application JUN 0 6 2005 Infiltration Basin Supplement Attachment Drainage Areas 1 and 2 DWQ_WARO Infiltration Basins 1 and 2 Section 11— Design Information Soils Report Summary — The Soil Survey for Dare County has established infiltration rates for Ncwhan-Urban and Newhan-Corolla soil types to be z20 inches per hour. The infiltration rate used, with a factor of safety of 2, was 10 inches per hour. The seasonal high ground water elevation is based upon one (1) boring and field observation. Section III — Required Items Checklist Basin I and Basin 2 f. The basins are located immediately adjacent to a concrete parking area to facilitate accessibility and maintenance. Access to the parking areas is achieved off public -rights -way. Basin I 1. All of the stormwater runoff entering Basin I passes over a grassed area prior to entering the basin. The roof runoff for Basin 2 must pass through several drainage structures prior to entering the basin. All other runoff which is not conveyed through pipes in Drainage Area 2 will pass over grassed areas prior to entering Basin 2. Basin 2 1. The roof runoff for Basin 2 must pass through several drainage structures prior to entering the basin. All other runoff which is not conveyed through pipes in Drainage Area 2 will pass over grassed areas prior to entering Basin 2. Basin 1 g. Overflow from both basins will pass through a minimum of fifty -feet of vegetated swale prior to entering the SA waters. Basin 1 q. The existing basin, Basin 1, has an existing overflow mechanism consisting of a b" diameter PVC pipe which overflows into the adjacent conveyance ditch. Basin 2 q. The proposed basin, Basin 2, will use a 12" Nyloplast Drain Basin. The drain basin has one inlet and two outlets. The invert for the outlet to the Basin is set at 4.5 MSL which corresponds to the bottom of the basin. The invert of the second outlet is set at which corresponds to the top of the basin. When the design elevation in the basin is reached, the stormwater will exit the drain basin through a pipe lbemarle & ASSOCIATES, LTD. August 4, 2005 NCDENR Land Quality Section 943 Washington Square Mall Washington, NC 27889 ATTN: Mr. William Moore, PE RE: Resubmittal The Nags Head Church Stormwater Review SW7050606 Dear Mr. Moore: '1JECLr1VE;D AUG 0 8 200 DWQ_WAR0 Please find the enclosed the revised Stormwater Management resubmittal for the Nags Head Church. The following revisions have been made: the sizes of the two (2) infiltration basins have been enlarged to accommodate 1-112" of minimum storage capacities, the locations of the bypass structures have been shown on the plans as well as their respective invert elevations, cross -sections for the infiltration basins have been shown, and the stormwater narrative, calculations, and supplements have been revised. Please replace the first page of the basin supplements with the new revised first page since pages 2 and 3 did not change. Please feel free to call me if you have further comments or questions regarding this project. Sincerely,, 'Z4& ared L. Madewell, PE Project Engineer Attachments cc: File Nags Head Church Cahoon & Kasten Architects (Ltr. Only) Engineering -- Surveying -- Land Planning P.O. Box 3989, 115 W Saint Clair St., Kill Devil Hills, NC 27948 Telephone: 252-441-2113 Fax: 252-441-0965 IQe��r� STORMWATER NARRATIVE Pry%4S for the NAGS HEAD CHURCH in NAGS HEAD, NORTH CAROLINA (REVISED) The congregation of the Nags Head Church intends to construct a new church on a site with an existing structure that will be removed upon completion of the new structure. The proposed church has a footprint of 10,040 SF. The site is located on 2.44 acres on the southwest corner of the intersection of Sound Side Road and US 158. A portion of the site is currently developed with concrete parking and sidewalks and a structure containing a chapel, administrative offices, and classrooms. The site is reasonably level with trees on the undeveloped portion of the property. The Soil Survey for Dare County has mapped the soils to consist of NuC (Newhan-Urban) and NhC (Newhan-Corolla) with the majority of the site being Newhan-Corolla. Both complexes are characterized by very rapid permeability with rates in excess of 20 inches per hour. Elevations range from just under 1.0 MSL to approximately 10.0 MSL. The lowest elevations that are not part of an existing stormwater management or conveyance device are around 4.0 MSL. Overall coverage for the site is 43.9%. There are two (2) drainage areas. Drainage area 1 includes the eastern one-half of the site. It consists of all of the existing parking and sidewalk and a small portion of the new parking and sidewalk. Coverage for Drainage Area 1 is being reduced from its current state. Runoff from Drainage Area 1 currently enters an infiltration basin where it infiltrates into the soil. Excess runoff above that from a 1.5-inch rainfall overflows through a 6-inch PVC pipe into an existing conveyance ditch adjacent to the Swale. Upon completion of the project and a resulting reduction in coverage, the basin in Drainage Area 1 will manage 4-1/2 inches of rainfall. The basin is managing stormwater very well and the aforementioned reduction in coverage will benefit its operation. Drainage Area 2, to the west, includes the new church and the majority of the new parking. An infiltration basin will be installed in the western portion of the site for Drainage Area 2. Roof runoff will be conveyed to the basin via building gutters and buried pipes. Sidewalk and parking runoff will sheet flow to the basin. The basin is designed to store and the runoff from a 2" storm. A bypass device will be constructed on the northern end of the basin so that when the 2- inch level is reached, incoming runoff collected by pipe is directed to a relocated portion of the conveyance ditch adjacent to the basin thus providing a bypass mechanism. Including infiltration, the basin will manage nearly 4-1/2 inches of rainfall. A soil boring was taken to estimate the depth to the water table in the vicinity of the proposed infiltration area. The boring was representative of the Newhan-Urban complex. The depth to the water table determined through this boring was 42" below the existing grade, which would equate to an elevation at approximately 2.5' MSL. �N HCARO •� OQ: •F Sg v ��y'�� c • 02 931 '. � f _00 may• �,4• �� %.Q •. GINS . • t��\� Prepared by Albemarle & Associates, Ltd 8/4/2005 � !"� ' '! `�. _� '�s �. —` _ � � . � '_+ v .T` ,�. +., � �,� t STORMWATER CALCULATIONS for the NAGS HEAD CI IURCII Stormwater Drainage Area #1 (Existing Parking and Portion of Proposed Parking and Sidewalk) (REVISED) Drainage Area 61,400 sf = 1.41 ac SURFACE AREA INFORMATION Ira revious Surface C Value Area C*A Sidewalks (Existing) 0.95 1,784 1,695 Sidewalks (Proposed) 0.95 1,297 1,232 Pavement(I;xisting) 0.95 20,182 t9,173 Pavement (Proposed) 0.95 1,522 1,446 Building 1.00 0 0 Total Impervious Area 24,785 23,546 Stormwater Management Areas C Value Area C*A Infiltration Basin 1.00 3,959 3,959 Total Stormwater Management Area 3,959 3,959 Total Contributing Area 28,744 27,505 Composite C 0.96 Contributing Area 0.66 ac Infiltration Basin Characteristics Rasin Storage Side Sloe Depth ft Volume c Infiltration Basin L3 1.75 3,540 'Total 3,540 Swale Storage Side Sloe Depth R Volume c nla 0 0 0 Total 0 Infiltration ** Surface Area (sQ Infiltration Rate Infiltration Basin 3,959 10.00 S wales 0 0.00 Total 3,959 Void Space Pond Center (sq Void Space n/a 20.00 Main Infiltration 1.00 Stormwater Management 1" 1.5" 2" 3.5" Intensity(in./hr) 0.5 0.75 1.0 1.75 Runoff (cfs) 0.32 0.47 0.63 1.10 2-Hour Runoff Volume (c f) 2,273 3,410 4546 7,956 Pond Storage Volume (cf) 3,540 3,540 3,540 3,540 Pond/Swale fnfiftration Volume (ef) 6,598 6,598 6,598 6,598 Void Volume Under Pond (cf) 0 0 0 0 Total Stormwater Managed (cf) 10,139 10,138 10,138 10,138 Percent Retained 446% 297% 223% 127% Percent of Runoff in Storage 156% 104% 78% 44% • - Stormwater falling upon the drainfield and perimeter areas with greater than two feet separation excluded from calculations due to the porosity of existing conditions. ** - based on two hour infiltration rate. 0 C A R (12 Prepared by Albemarle & Associates, Ltd. 814f2005 r STORMWATER CALCULATIONS for the NAGS BEAD CHURCI I Stormwater Drainage Area #2 (Proposed Building, Sidewalk, and Parking) (REVISED) Drainage Area 44,617 sf = 1.02 Eke SURFACE AREA INFORMATION Imprevious Surface C Value Area C*A 0.95 0 0 Sidewalks (Existing) Sidewalks (Proposed) 0.95 917 $71 Pavement (Existing) 0.95 0 0 Pavement (Proposed) 0.95 11,094 10,539 Building 1.00 10,288 10,288 Total Impervious Area 22,299 21,698 Stormwater Mana ement Areas C Value Area C*A Infiltration Basin 1.00 3,518 3,518 Total Stormwater Management Area 3,518 3,518 Total Contributing Area 25,817 25,216 Composite C Contributing Area Infiltration Basin Characteristics Basin Storage Stormwater Basin 'total 0.98 0.59 ac Side Slope Depth 1:3 1.25 2 43 Swale Storage I Side Sloe Depth (ft) I Volume c n1a 0 0 0 Total 0 Infiltration ** Surface Areas Infiltration Rate in.lhr Infiltration Volume c Infiltration Basin 3,518 10.00 5,863 'rota) 3,518 5,863 Void Space Pond Center (so Depth f1 Void Volume c nla 20.00 1.00 0 Main 0 Stormwater Management l" 1,5" 2" 3" Intensity (in.lhr) 0.5 0.75 1.0 1.5 Runoff(cfs) 0.29 0.43 0.58 0.87 2-Hour Runoff Volume (cf) 2,094 3,126 4,168 6,252 Pond Storage Volume (cf) 3,212 3,212 3,212 3,212 Pond/Swale Infiltration Volume (cf) 5,863 5,863 5,863 5,863 Void Volume Under Pond (cf) 0 0 0 0 Total Stormwater Managed (cf) 9,075 9,075 9,075 9,075 Percent Retained 435% 290% 218% 145% Percent of Runoff in Storage 154% 103% 77% 51 • - Stormwater falling upon the drainfield and perimeter areas with greater than two feet separation excluded from calculations due to the porosity of existing conditions. ** - based on two hour infiltration rate. Prepared by Albemarle & Associates 8/4/2005 (Re vied) Permit No. (to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORM WATER MANAGEMENT PERMIT APPLICATION FORM INFILTRATION BASIN SUPPLEMENT This form may be photocopiedfor use as an original DWQ Stormwater Management Plan ,Review: 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: Nags Head Church Contact Person: Mr. Jared L. Madewell. PE This worksheet applies to: Basin No. I (as identified on plans) Phone Number: 252-441-21 13 in Drainage Area 1 (from Form SWU-101) [I. 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 Sire Basin Volume Provided Basin Elevations Bottom Elevation Storage Elevation Top Elevation NuC & NhC >20 in/hr r cf/hr/sf (circle appropriate units) 2.50 fmsl (Seasonal High Water Table elevation) l .5 inch (1.5 inch event for SA waters, I inch event for others) 3,286 c.f. 0.0625 Days 202.0 ft. x 19.6 f1.= 3,959 sq.ft. (bottom dimensions) 3,540 c.f. 4.25 Fmsl 5.33 Fmsl 6.00 Fmsl Form SW U-103 Rev 3.99 Pagel of 3 1 + �'i` ' 3i�� .. r. � + � , r Y { r , '� '♦ a i', .. � . ` C, + r J.i -� F�f ..+ ' .. - r:r7r• � �� - ;r . � "„ �; . ."1' s• . � , ' � + ,. � � �' , , � r, Permit No. {�F."' , , j �, ` (to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources 3�5 Division of Water Quality 1)VVQVAR0 STORMWATER MANAGEMENT PERMIT APPLICATION FORM INFILTRATION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal include a sto water management permit application, an infiltration basin supplement for each system, design calcula ' n , soils report and plans and specifications showing all stormwater conveyances and system details. 1. PROJECT INFORMATION Project Name: Nags Head Church Contact Person: Mr. Jared L. Madewell, PE Ph e Number: 252-441-2113 This worksheet applies to: Basin No. I ���_ in Drainage Area I (as identified onptans) (from Form SWU-tot) 11. DESIGN INFORMATION - Attach supportin9�alcul ions/documentation. The soils report must be based upon an actual field investigation and so borin s. County soil maps are not an acceptable source of soils information. All elevations gall a in feet mean sea level (fmsl). Soils Report Summary Soi I Type Infiltration Rate SHWT Elevation Basin Desi Parameters Design Sto Design Vol me Drawdown e Basin Dimensions Basin Size Basin Volume Provided Basin Elevations Bottom Elevation Storage Elevation Top Elevation NuC & Nh >20 in/hr cf/hr/sf (circle appropriate units) 2.50 fmsl ( easonal High Water Table elevation) 5 inc(1.5 inch event for SA waters, 1 inch event for others) 3, 6 5 N.00 ft. x 16.00 ft.= 2,960 sq.ft. (bottom dimensions) 2.88 c.f. 4.25 Fmsl 5.25 Fmsl (With Infiltration) 6.00 Fms l Form S W U- 103 Rev 3.99 Page I 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 4 a. System is located 50 feet from class SA waters and 30, feet from other surface waters. 4 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. 4? d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. 4 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. 4 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 (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). 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. m. 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). 1 _ o. Flow distribution mechanism within the basin is provided. 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. 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 ,.. , � I i . � ' ., , • J , � , , • 1 ' • � s, � � �� . � � � '. � J 'r � � , i ' , • ,— � � . . � � . � I ' 1 i � � .� , i _ . i - ! � � t , . , .� ' � � - � � � � � 1 •f � , � ' . r ,. r �. � IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT 1. After every runoff producing rainfal I 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. 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. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when the 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 _0.75_ 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 stormwater 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:_ Mr. Bruce Copeland Address:_ P.O. Box 302; Nags Head, 27959 Phone: 252-44J -7548 Signature: Date: /Z' Nate: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I, Tared. L,ma so-wel y , a Notary Public for the State of NOA CA rr0114g , County of I6 re , do hereby certify that B C '.Ac e [n,Qe �A,a d personally appeared before me this day of Ma , 2005 , and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand and official seal, SEAL My commission expires 2-15- 2 9 Signature • • • �4 I�ioli�ry �+�IHOrt11 C'.arOIIr18 County of Dwe %€ Jared L. MB&Weil . - � `. - . ` � z � . (Revisca� 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 This form may be photocopied for use as an original DWQ Stormwater Management Plan Review: 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: Nags Head Church Contact Person: Mr. Jared L. Madewell, PE Phone Number: 252-441-21 13 This worksheet applies to: Basin No. 2 in Drainage Area (as identified on plan) 2 (from F'ormSWU-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 (fms]). 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 NuC & NhC >20 in/hr r of/hr/sf (circle appropriate units) 2.50 fmsl (Seasonal High Writer Table elevation) L5 inch (1.5 inch event for SA waters, I inch event for others) 3,042 c.f. 0.0625 Days 143.0 ft. x 24.6 3.070 c.f. 4.50 fmsl 5.58 fmsl 5.75 fmsl Form S W U-103 Rev 3.99 Page 1 of 3 ft.= 3,518 sq.ft. (bottom dimensions) r'r IV. Tr °rl T) _ •rs , 11 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 This form may be photocopied for use as an original DW_O Stormwater Management Plan Review: 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: Nags Head Church Contact Person: Mr. Jared L. Madewell, PE Phone Number �252-441-2113 This worksheet applies to: Basin No. 2 (we�) in Drainage Area 2 (as identified on plans) t (from Form SWU-101) I1. DESIGN INFORMATION - Attach supporting alculat ons documentation. The soils report must be based upon an actual field investigation and so'l borN�gs. County soil maps are not an acceptable source of soils information. All elevations shall be in ket mean sea level (fmsl). Soils Report Summary Soil Type NuC & NhC Infiltration Rate >20 in/ r r�-' /hr/sf (circle appropriate unit~) SHWT Elevation / .50 Sonal High Water Table elevation) Basin Design Parame r*\\ Design Storm inch (1.5 inch eventfor SA waters, I inch event for others) Design Volume c.f.Drawdown Time Days Basin Dimensions Basin Size 142.05 ft. x 20.00 ft.= 2,841 sd.ft. (bottom dimensions) Basin Volume Provided 2,390 c.f. Basin Elevations Bottom Elevation 4.50 fmsl Storage Elevation 5.50 fmsl Top Elevation 5.75 fmsl Form SWU-103 Rev 3.99 Pagel of 3 I1I. 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. 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. 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 (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). e 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. m. 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. 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 S W U-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 the 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 0.92— 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 stormwater control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed. I acknowledge and agree by my signature below that l 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:_ Mr. Bruce Copeland Address:_ P.O. Box 302; Nags Head, 27959 Phone:_ 252-441-7548 Signature Date:_ ,r �'7 le Note: The legally responsible party should not he 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, J A red L , /Act � ew e f l , a Notary Public for the State of 4N or+h 64 Ica[�y� County of Da {`e , do hereby certify that r Lv—e✓ a n ci personally appeared before me this day of a\ 17 , 2W S, and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand and official seal, SEAL My commission expires Z 15— 200 FFI IAl- Si nature Noteny RM4c. North Carolina g County of Dare Jared L. Madewell :° F ,�� '� `� ,. •, �. 7+- a :`�� r � � = �j. '' '":.tJ'1' Yr '"1 C•4 �'� rf ' _ 1'4 `. � �! _ us rr' ? : ; tilt' �' '+ � k�� .� - � - - _ - _ �� ROY COOPER Governor MICHAEL S. REGAN .Secretary WILLIAM E. (TOBY) VINSON, JR Interim Director Pastor Rick Lawrenson Nags Head Church, Inc. P.O. Box 302 Nags Head, NC 27959 Dear Pastor Lawrenson: NORTH CAROLINA Environmental Quality January 11, 2019 Subject: Stormwater Permit Renewal Stormwater Management Permit SW7050606 Nags Head Church Dare County r 1Vo A Division of Energy, Mineral, and Land Resources file review has determined that Stormwater Permit SW7050606 for a stormwater treatment system consisting of two infiltration basins serving the Nags Head Church located at 105 W. Soundside Road in Nags Head, NC expires on September 8, 2019. This is a reminder that permit renewal applications are due 180 days prior.to expiration. We do not have a record of receiving a renewal application at this time. Please submit a completed permit renewal application along with a $505.00 fee for permit renewal. Permit application forms for renewal can be found on our website at: htt s: de ,nc. ov about divisions eiiet-gy-iiiinei-al-land-resources/eiiei-gy-mineral-lancJ- rulesJstortnwater-program/_posL:..custruction. North Carolina General Statutes and the Coastal Stormwater rules require that this property be covered under a stormwater permit. Failure to maintain a permit subjects the owner to assessment of civil penalties. If you have questions, please feel free to contact me at (252) 948-3923. 1 will be glad to discuss this by phone or meet with you. If you would like I can e-mail you a copy of the renewal application. You can request a copy by e-mailing me at roger.thorpe@ncdenr.gov. Sincerely, Roger K. Thorpe Environmental Engineer nnrvr�+.rwd:a_iHn dwN+�.ni a oMmmmneui dirmr North Carotin Department of Fnvironmental Quality 1 Dtviston of Energy, Mineral and Land Resources Washington Regional Office 1943 Washington Square Mail I Washingtoi, North Carolina 27889 252.946.6481