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HomeMy WebLinkAboutSW7031012_CURRENT PERMIT_20131011STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW'I lyl DOC TYPE �P CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE oV'?j//_Ja YYYYMMDD NCDENR North Carolina Department of Environment and Natural Resources Division of Energy, Mineral, and Land Resources Land Quality Section Tracy E. Davis, PE, CPM Pat McCrory, Governor Director John E. Skvarla, III, Secretary October 11, 2013 City Beverage Co., Inc. Attn: Mr. Jimmie Dixon, Jr., VP of Sales/Owner PO Box 1036 Elizabeth City, NC 27909 Subject: Stormwater Permit No. SW7031012 Modification City Beverage Co., Inc. High Density Project Dare County Dear Mr. Dixon: The Washington Regional Office received a complete Stormwater Management Permit Application for City Beverage Co., Inc. on August 27, 2013. 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. SW7031012 dated October 11, 2013, for the continued construction of the subject project. This permit shall be effective from the date of issuance until October 11, 2021, 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, 6714 Mail Service Center, Raleigh, NC 27699-6714. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact me at (252) 946-6481. Sincerely, Scott Vinson Environmental Engineer G:\LR\SWP\SAV\G-Stormwater\PERMIT\SW7031012M cc: Victor White, PE Pare County Planning / Building Inspections t/Washington Regional Office Washington Regional Office 943 Washington Square Mall, Washington, North Carolina 27889 • Phone: 252-946-6481 / FAX: 252-975-3716 Internet: http://www.portal.ncdenr,org/web/Ir/land-quality An Equal Opportunity / Affirmative Action Employer - 50%Recycled/10% Post Consumer Paper 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 City Beverage Co., Inc. Located on NCSR 1118 (Driftwood Drive), Manteo Dare County FOR THE construction, operation and maintenance of an infiltration basin in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit. This permit shall be effective from the date of issuance until October 11, 2021, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.6 on page 3 of this permit. The stormwater control has been designed to handle.the runoff from 135,241 square feet of impervious area. 3. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans. 4. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. Page 2 of 7 6. The following design criteria have been provided in the infiltration basin and must be maintained at design condition: a. Drainage Area, acres: b. Total Impervious Surfaces, ft2: C. Design Storm, inches: d. Basin Depth, feet: e. Bottom Elevation, FMSL: f. Bottom Surface Area, ft2: g. Bypass Weir Elevation, FMSL: h. Permitted Storage Volume, ft3: i. Expected Infiltration Rate, in/hr: j. Seasonal High Water Table, FMSL: k. Receiving Stream/River Basin: I. Stream Index Number: m. Classification of Water Body: II. SCHEDULE OF COMPLIANCE 9.33 135,241 1.50 2.00 9.0 34,712 11.00 110,971 6.0 — 20.0 7.00 UT Croatan Sound / Pasquotank 30 — 20 — (2) "SA; HQW" 1. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans specifications. f. Debris removal and unclogging of bypass structure, infiltration media, spreader, catch basins, piping and vegetated filter. g. A clear access path to the bypass structure must be available at all times. and flow Page 3 of 7 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. The facilities shall be constructed as shown on the approved plans. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 6. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has .been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 7. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 8. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 9. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 10. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 11. A copy of the approved plans and specifications shall be maintained on file by the Permittee at all times. 12. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. Page 4 of 7 III. GENERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director. In the event of a change of ownership, or a name change, the permittee must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 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 143-215.6A to 143-215.6C. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 5. The permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. The permittee shall notify the Division any name, ownership or mailing address changes within 30 days. 10. This permit shall be effective from the date of issuance until October 11, 2021. Application for permit renewal shall be submitted 180 days prior to the expiration date of this permit and must be accompanied by the processing fee. Permit issued this the 11th day of October, 2013. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION //!�� ,C /Z / for Tracy.E."Davis, PE, CPM Division of Energy, Mineral, and Land Resources By Authority of the Environmental Management Commission Permit No. SW7031012 Modification Page 5 of 7 City Beverage Co., Inc. Stormwater Permit No. SW7031012 Modification Dare County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date Page 6 of 7 Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The bypass structure weir elevation is per the approved plan. 6. The bypass structure is located per the approved plans. 7. A Trash Rack is provided on the bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short-circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ Regional Office Dare County Planning / Building Inspections Page 7 of 7 DWQ USE ONLY Date Received Fee Paid Permit Number Sln1 Applicable Rules: ✓ Coastal SW -1995 ✓ Coastal SW - 2008 / Ph II - Post Construction (select all that apply) ,/ Non -Coastal SW- HQW/ORW Waters ✓ Universal Stormwater Management Plan ,/ Other WQ M mt Plan: a State of North Carolina Department of Environment and Natural Resources t1 ;ram• Division of Water Quality tl V STORMWATER MANAGEMENT PERMIT APPLICATION FORM AUG 2 J 2G13 This form may be photocopied for use as an original I. GENERAL INFORMATION n'ryP,pFC�, .' 7 ! a� �/-may J 1. Project Name (subdivision, facility, or establishment name -should be consistent with proje rtame�n a ��, *� specifications, letters, operation and maintenance agreements, etc.): IliP City Beverage Co., Inc. C*t 2. Location of Project (street address): 1099 and 1111 Driftwood Drive City:Manteo County:Dare Zip:27954 3. Directions to project (from nearest major intersection): Off of S.R. 1118 (Driftwood Drivel across from Dare County Airport 4. Lalitude:35* 55' " N Longitude:75° 41' " W of the main entrance to the project. It. PERMIT INFORMATION: a. Specify whether project is (check one): ❑New ®Modification ❑ Renewal w/ Modifications tRenervals With modifications also requires SWU-102 — Remand Application Form b.If this application is being submitted as the result of a modification to an existing permit, list the existing permit numberSW7031012 , its issue date (if known)3/12/2004 and the status of construction: []Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification 2. Specify the type of project (check one): [—]Low Density ®I -sigh Density ❑Drains to an Offsite Stormwater System ❑Other 3. If this application is being submitted as the result of a previously returned application or a letter from DWQ requesting a state stormwater management permit application, list the stormwater project number, if assigned, N/A and the previous name of the project, if different than currently proposed, (V A 4. a. Additional Project Requirements (check applicable blanks; information on required slate permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑LAMA Major ❑NPDES Industrial Stormwater ®Sedimentation/Erosion Control: 1.35 ac of Disturbed Area ❑404/401 Permit: Proposed Impacts b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number, issue date and the type of each permit 5. Is the project located within 5 miles of a public airport? []No ®Yes If yes, see S.L. 2012-200, Part VI: httu://portal ncdenr.org/web/wq/ws/su/statesw/rules laws Form SWU-l01 Version 06Aug2012 Page 1 of III. CONTACT INFORMATION 1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee, designated government official, individual, etc. who owns the project): b.Contact information for person listed in item la above: Street AddressY.U. Box 1u:sb City:Elizabeth City State:NC Zip:27909 Mailing Address (if applicable): City: Dtate: Phone: (252 ) 330-5539 Fax: c. Please check the appropriate box. The applicant listed above is: ® The property owner (Skip to Contact Information, item 3a) ❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below) ❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and 2b below) ❑ Developer* (Complete Contact Information, item 2a and 2b below.) 2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the person who owns the property that the project is located on): Property Owner/Organization:Same as above Signing Official & Title: b.Contact information for person listed in item 2a above: Street Address: City: State: Mailing Address (if applicable): City: State: Phone: ( ) _ Fax: 3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other person who can answer questions about the project: Other Contact Person/Organization:Victor White P.E. Signing Official & b.Contact information for person listed in item 3a above: Mailing Address:P.O. Box 1190 City:Kitty Hawk Phone: (252 ) 491-2125 Email:victor@landmarkeng.net 4. Local jurisdiction for building permits: State:NC Zip:27949 Fax: (252 ) 491-2285 Point of ContactDonna Creef Phone #: (252 ) 475-5873 Form SWU-101 Version 06Aug2012 Page 2 of 6 IV. PROJECT INFORMATION 1. In the space provided below, briefly summarize how the stormwater runoff will be treated. Stormwater from impervious surfaces will sheet flow into grassy infiltration swales & basin for detention and 2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved: ❑ Approval of a Site Specific Development Plan or PUD Approval Date: ❑ Valid Building Permit Issued Date: ❑ Other: Date: b.lf claiming vested rights, identify the regulation(s) the project has been designed in accordance with: ❑ Coastal SW —1995 ❑ Ph 11— Post Construction 3. Stormwater runoff from this project drains to the Pasquotank River basin. 4. Total Property Area: 9.33 acres 5. Total Coastal Wetlands Area: 0 acres 6. Total Surface Water Area:_0 acres 7. Total Property Area (4) — Total Coastal Wetlands Area (5) — Total Surface Water Area (6) = Total Project Area+: 9.33 acres Total project area shall be calculated to exclude the following the normal pool of impounded structures, the area between the banks of streams and rivers, the area below the Normal High Water (NHW) line or Mean High Water (MHW) line, and coastal wetlands landward from the NHW (or MHIV) line. The resultant project area is used to calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line may be included in the total project area. 8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 33.27 % 9. Flow many drainage areas does the project have?2 (For high density, count 1 for each proposed engineered stornnvater BMP. For low density and other projects, use 1 for the whole property area) 10. Complete the following information for each drainage area identified in Project Information item 9. If there are more than four 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 1 Drainage Area 2 Drainage Area Drainage Area Receiving Stream Name Croatan sound Croatan Sound _ _ Stream Class * SA • }(,Z%,i SA' avJ Stream Index Number * 3J_..zo. R T Total Drainage Area (sf) 203,334 203,140 On -site Drainage Area (sf) 203,334 203,140 Off -site Drainage Area (sf) 0 0 Proposed Impervious Area** (so 70,410 64,831 Impervious Area** (total) 34.63 31.91 Impervious" Surface Area Drainage Area 1 Drainage Area 2 Drainage Area Drainage Area On -site Buildings/Lots (so 10,800 0 _ _ On -site Streets (so 6,906 0 On -site Parking (so 0 —0-- On-site Sidewalks (sf) 0 —0 -- Other on -site (sf) 0 0 Future (so 0 0 Off -site (so 0 0 Existing BUA*** (sf) 52,704 64,831 Total (sf): 70,410 64,831 Wa Un U,ISS uuu urucA Number can be determined at: nttpy/portal.nedenr orghveb/wq[ps/csu/clnsshCations Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Report only that amount of existing BUA that will remain after development. Do not report any existing BLIA that is to be removed and which will be replaced by new BUA. Form SWU-101 Version 06Aug2012 Page 3 of 6 11. I -low was the off -site impervious area listed above determined? Provide documentation. N/A Projects in Union County: Contact DWQ Central Office staffto check if the project is located within a Threatened & Endangered Species watershed that may be subject to more stringen.ctormw[rter requirements as per 15A NCAC 026 .0600. V. SUPPLEMENT AND O&M FORMS The applicable state stormwater management permit supplement and operation and maintenance (O&M) forms must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded from littp://portal.iicdenr.org/web/wq/­ws/`­sti/bmp-manual. 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. A detailed application instruction sheet and BMP checklists are available from littp://portal.ncdenr.orgZweb/wq/ws/su/­statesw/forms does. The complete application package should be submitted to the appropriate DWQ Office. (The appropriate office may be found by locating project on the interactive online map at http://portal.ncdenr.org/web/wg/ws/su/maps.) Please indicate that the following required information have been provided by initialing in the space provided for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for each submitted application package from ham://portaI.ncdenr.org/web/wq/ws/su/statesw/forms does. Initials 1. Original and one copy of the Stormwater Management Permit Application Form. 2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants Form. (if required as per Part VII below) 3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M agreement(s) for each BMP. 4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to http:ZZwww.envhelp.org/pages/onestopexpress.html for information on the Express program and the associated fees. Contact the appropriate regional office Express Permit Coordinator for additional information and to schedule the required application meeting.) 5. A detailed narrative (one to two pages) describing the stormwater treatment/management for 6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the receiving stream drains to class SA waters within'k mile of the site boundary, include the Vz mile radius on the map. 7. Sealed, signed and dated calculations (one copy). 8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including: a. Development/Project name. b. Engineer and firm. c. Location map with named streets and NCSR numbers. d. Legend. e. North arrow. f. Scale. g. Revision number and dates. h. Identify all surface waters on the plans by delineating the normal pool elevation of impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal waters, and any coastal wetlands landward of the MHW or NHW lines. • Delineate the vegetated buffer landward from the normal pool elevation of impounded structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters. i. Dimensioned property/project boundary with bearings & distances. j. Site Layout with all BUA identified and dimensioned. k. Existing contours, proposed contours, spot elevations, finished floor elevations. 1. Details of roads, drainage features, collection systems, and stormwater control measures. m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a qualified person. Provide documentation of qualifications and identify the person who made the determination on the plans. n. Existing drainage (including off -site), drainage easements, pipe sizes, rcmoff calculations. o. Drainage areas delineated (included in the main set of plans, not as a separate document). p. Vegetated buffers (where required). Form SWU-101 Version 06Aug2012 Page 4 of 6 3. Copy of any applicable soils report with the associated SHWT elevations (Please identify elevations in addition to depths) as well as a map of the boring locations with the existing elevations and boring logs. Include an 8.5"x11" copy of the NRCS County Soils map with the project area clearly delineated. For projects with infiltration BMPs, the report should also include the soil type, expected infiltration rate, and the method of determining the infiltration rate. (Infiltration Devices submitted to WiRO: Schedule a site visit for DWQ to verily the SHWT prior to submittal, (910) 796-7378.) 10. A copy of the most current property deed. Deed book: Page No: 11. For corporations and limited liability corporations (LLC): Provide documentation from the NC _ Secretary of State or other official documentation, which supports the titles and positions held by the persons listed in Contact Information, item la, 2a, and/or 3a per 15A NCAC 21-1.1003(e). The corporation or LLC must be listed as an active corporation in good standing with the NC Secretary of State, otherwise the application will be returned. httl2://www.secretary.state.nc.tis/Corporations/CSearch.aspx VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and protective covenants forms can be downloaded from hItp://portal ncdenr off/web/wq/ws/su/statesw/forms_docs. Download the latest versions for each submittal. In the instances where the applicant is different than the property owner, it is the responsibility of the property owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring that the deed restrictions are recorded. By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and protective covenants for this project, if required, shall include all the items required in the permit and listed on the forms available on the website, 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 NC DWQ, and that they will be recorded prior to the sale of any lot. VIII. CONSULTANT INFORMATION AND AUTHORIZATION Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as addressing requests for additional information). Consulting Engineer:Victor White, P.E. Consulting Firm: Landmark Eng. & Env P.C. Mailing Address:P.O. Box 1190 City:Kitty I-fawk Phone: (252 ) 491-2125 Email:victor@landmarkeng.net State:NC Zip:27949 Fax: (252 ) 491-2285 IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this section) 1, (print or type name of person listed in Contact Information, item 2a) , certify that I own the property identified in this permit application, and thus give permission to (print or type name of person listed in Contact Information, item la) with (print or type name of organization listed in Contact Information, item 1a) to develop the project as currently proposed. A copy of the lease agreement or pending property sales contract has been provided with the submittal, which indicates the party responsible for the operation and maintenance of the stormwater system. Form SWU-101 Version 06Aug2012 Page 5 of 6 As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their Icase agreement, or pending sale, responsibility for compliance with the DWQ Stormwater permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DWQ immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment ofLwalties of up to $25,000 per day, pursuant to NCGS 143-215.6. Signaturc: Date: Sharon P. Hollowel Pasquotank a Notary Public for the State of No _ th of ; a County of do hereby certify that J.T. Dixon personally appeared before me this 28 day of Jan. 2013 , and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, X. APPLICANT'S CERTIFICATION SEAL My commission expires My Commission Expires March 26, 2015 I, (print or type name of person listed in Contact Information, item 1a) 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 the applicable stormwater rules under 15A NCAC 2H .1000 and any other applicable state stormwater requirements. Signature: a Notary Public for the State of do hereby certify that before me this _ day of County of personally appeared . and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission expires Form SWU-101 Version 06Aug2012 Page 6 of 6 LANDMARK ENGINEERING & ENVIRONMENTAL, P.C. MAILING: P.O. Box 1 1 90 • KITTY HAWK. NC 27949 PHYSICAL: 8460 CARATOKE HWY. - SUITE 202 • POWELLS POINT, NC 27966 PHONE: 252.491.2125 • FAX: 252.491.2285 • EMAIL: OFFICE@LANDMARKENG, NET City Beverage Co., Inc. STORMWATER MANAGEMENT PLAN MODIFICATION CALCULATIONS 4/20/ 13 Infiltration Swale/Basin Contour Areas (Calculated by Autocad) 1 1" - 80,267 sq. ft. (Top of Storage a Overflow Elevation) 10" - 53,481 sq. ft. 9.0" - 34,712 sq.ft. (Bottom of infiltration basin) Direct Basin Volume 1 1' to 10' l.Oft x ((80,267 sq. ft. + 53,481 sq. ft.)/2) = 66,874 cu. ft. 10' to 9' ].Oft x ((53,481 sq. ft. + 34,712 sq. ft.)/2) = 44,097 cu. ft. Direct Storagc Infiltration Basin = 110,971 cu. ft Indirect storage (storage in soil voids below basin and above the SHWT) 80,267 sq, ft. x 0.2 x 2.0 ft = 32,107 cu, ft. Total Storage Infiltration Swale/Basin = 143,078 cu. ft Total impervious coverage = 135,241 sq. ft. Assume 100% of runoff from impervious coverage reaches infiltration basins 143,078 cu. ft. /(1.0 x 135,241 sq. ft.) = 1.058 ft. or 12.7 inches AUG 2 7 2013 LQ s�Eeisan�s:�arrr:. ,E Therefore storage is Provided is in excess of ten year, two hour storm (4.3 inches) LANDMARK ENGINEERING & ENVIRONMENTAL, P.C. MAILING: P.O. Box 1 1 90 KITTY HAWK, NC 27949 PHYSICAL: 8460 CARATOKE HWY. - SUITE 202 • POWELLS POINT, NC 27966 PHONE: 252.491.2125 • FAX: 252.491,2285 • EMAIL: OFFICE@LANDMARKENG.NET AUG 2 7 2013 l-6 T. a City Beverage Co.. Inc :`' ; y 7-V VA..,_ Revised Stormwater Management Plan Design Narrative April 20, 2013 The above referenced project is an expansion of an existing self storage facility, adding one additional self storage building and associated infrastructure. Due to the location of the building and associated infrastructure, the existing permitted infiltration basin will be modified. The site is located off of Driftwood Drive in Manteo, Dare County, North Carolina. Although The site is relatively large, the stormwater management plan is as two drainage area. Drainage area one consists of the self storage units, while Drainage area 2 consists of the Existing Distribution area.. Stormwater runoff from existing and proposed impervious surfaces will be conveyed to the stormwater retention system via sheet flow The entire system provide well in excess of the ten year two hour storm, conservatively assuming that 100% of all stormwater is conveyed to the proposed basin system. Stormwater in excess of the proposed infiltration swale/ basins capacity will overflow out of a grassy spillway into a Swale on the NCDOT Right -of -Way. The soils present at the site (Baymeade Series Soils) provide suitable infiltration rates which are an order of magnitude greater than required for drawdown of the infiltration basins between storm events. Listed depths to the seasonal high water table for Bayineade Soils are listed in the UDSA's Soil Survey of Dare County North Carolina as in around 3 feet below the land surface. Soil borings conducted at the site agreed with this published data. Based on existing elevations at the site and both published and soil boring information, a seasonal high water table elevation of 7.0 msl (NAVD 88 datum) was calculated and used for design purposes. The site is located across Driftwood Drive from the Dare County Airport. No Stormwater ponds exist or are proposed for this project. Due to the drawdown rates of stormwater in the basins and the size of the basins themselves, it is the opinion of Landmark that these basins do not impact the safety of the adjacent airport. LANDMARK ENGINEERING & ENVIRONMENTAL, P.C. MAILING: P.O. Box 1 190 • KITTY HAWK, NC 27949 PHYSICAL: 8460 CARATOKE HWY. - SUITE 202 • POWELLS POINT, NC 27966 PHONE: 252,491.2125 • FAX: 252.491.2285 • EMAIL: OFFICE@LANDMARKENG.NET April 20, 2013 Mr. Scott Vinson NCDE&NR Division of Water Quality 943 Washington Square Mall Washington, NC 27889 Re: City Beverage Co., Inc Manteo, Dare County, NC Stormwater Management Plan Permit Modification Application Package [)car Mr. Vinson: AUG 2 7 2013 � kQ a jd d g On Behalf of City Beverage Co., Inc., Landmark Engineering & Environmental, P.C. submits for your review and approval, a Stormwater Management Plan Modification package containing the following: 1.) Check payable to NCDE&NR in the amount of $505.00. 2.) An original and one copy of the Revised Stormwater Management Plan Application Form. 4.) Two copies of Stormwater calculations and narrative. 5.) Two sets of Plan sheets and details (Sheets C1-C2). Thank you for your time and attention to this matter. If you have any questions or require additional information please contact me at (252) 491-2125. Respectfully submitted, Landmprk Engineering & Environmental, P.C. Victor E White, P.E. OFFICE USE ONLY llale Received FCC Paid Permit Number Orta 10 -17- Zoo 3 20 O 2-- State of North Carolina RECEND Department of Environment and Natural Resources Division of Water Quality FEB 1 3 2004 STORMWATER MANAGEMENT PERMIT APPLICATION FORtW�-VUf lR® This form may he photocopied for use as an original tIJJ f"! I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): 3. Mailing Address for person listed in item 2 above: Cl 13 City: -FL iz.A_3E C-1"(`f State: NC Zip:_;L 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.): C17y 3�UERAUE STc>�AC�� (�n11rtS 5. Location of Project (street address) �w I�R)�TwoaD DAWt City: "AtQTEo County: IW—k 6. Directions to project (from nearest major interse tion): dFF OF S,R. 1\IQ, �flRIF'(waop �Rly�� {�cRoSS FROw)_ DAR_� CauN*`I PIRPo1�Y o t ' 7. Latitude: c7 J SrJ r-J Longitude: 15o I VJ of project. 8. Contact person who can answer questions about the project: Name: Nf I LTO(Z, U3\A ('YE7' ,{ • Telephone Number. 202 - 6460 11. PERMIT INFORMATION: / 1. Specify whether project is (check one): _ / New Renewal Modification Form SWU-101 Version 3.99 Page I of -tl/ 405 :; !' `I_I 1 I R�'3 -T O� 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number fv/-A and its issue date (if known) 3. Specify the type of project (check one): `/ Low Density � High Density Reclevelop _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. III. PROJECT INFORMATION L 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. STGfLvq wQTtR rRovn INPI RytcJs SuRFfK>=-S wt�l_S+IcET F •tTo GPiRSSy IrtFiLT2AriuN_SWA tS——3AS.t�I Fa(Y IJETerfTionl ANO TBEA-rmENT C�J IFiLTAATIarJ� 2. Stormwater runoff from this project drains to the f'ASQUO TA NIL River basin. \ '3 3. _�1 AT gui -D607J 3. Total Project Area:_$'3eo OFR31i acres 4. Project Built Upon Area: 5 1 •3 �I.33 ToTq� 5. Flow many drainage areas does the project have? oC 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 CRo TAN 561211,1J C-RGATAN SoutJD Receiving Stream Class S A S Drainage Area 3.9-4 CRE5 5.3(o AC ES Existing Impervious' Area 24(,q SO.FT. Proposed Impervious'Area 103 $ ( S . F-T• 2• Impervious* Area (total) (OO'lo O'7-6 Impervious* Surface Area Drainage Area I Drainage Area 2 On -site Buildings pR oSED i�i Q. Ff. FT. On -site '^ws 10 UOQ $c�,F`T 149.$ S4q. FT. On -site Parking pR,,p,svD5 3 ITFT. q G 51 On -site e 1 4 So sa. Frt -so ay .FT. Other on -site Off -site U p Total: Q .FT. Total: fo) .5 FT. 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 — RT GUILD aL) OUT - Fxi5T�N4 FuTuR✓:A%p ,f I EYisTtnf(� FUTURE PARK,NG FXPANS 101.1 7. How was the off -site impervious area listed above derived? PJ /p, IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, oulparcels 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 he changed or deleted without the consent of the State. 2. No more than square feel 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 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 \JEw • One copy of the applicable Supplement Form(s) for each BMP \JcW • Permit application processing fee of $420 (payable to NCDENR) PREutousulj �UgM irrl • Detailed narrative description of Stormwater treatment/management \)EW • Two copies of plans and specifications, including: JAW - Development/Project name - Engineer and firm -Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VIL AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual orfirm): VICTOR E, 1,.1N1*F�,t. LANDMARK Eq(;._� ENU,�e. Mailing Address: Y-o I.19a City: K ty nt1W% State: Zip: a9tiq Phone: (—a51Fax: Vill. APPLICANT'S CERTIFICATION 1, (print or type na a person listed in General Information, item 2) certify that the in rm tion included on this permit application form is, to the best of my knowledge, correct and that the project wr I be constructed in conformance with the approved plans, that the required deed restrictions and protective cov na will be recorded, and [ha[ the proposed project complies with the requirements of 15A NCAC 2H .100 . Signature:_ _ Date: / Lt D ForntSWU-101 Version3.99 Page 4of4 Permit No. (to he provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM RECEIVED INFILTRATION BASIN SUPPLEMENT FEB 1 3 2004 This form may he photocopied for use as an original �n'o Ap DWQ Stonnwater Management Plan Review: 1) a-W- "R® 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. PROJECT INFORMATION Project Name : Contact Person: C phis worksheet applies to: Basin No. I; STo(ZA6C UtQ tT.S Phone Number: (a52) 5I27- in Drainage ArcaS i ZnC a (as identified on plan) (from Eorm SWU-101) 11. 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 sip SPSm Infiltration Rate (0--)7,0 ❑/h' t'eI%hr/sl(circ/eupprupriuletnrile)�---CIuVSSZuATOUi StIWTElevation T.O Imsl(ScasnmdHighlPinerTnhlcelevulion)^ Basin Design Parameters Design Storm I . S inch (1.5 inch eretu fin' S.d iralena. I inch even. inothers) Design Volume I c.f. Drawdown Time :3 clays Basin Dim T��=tR%ULAR SFE FLANS] Fop, AN CQUAL. SiZFD REGTAt.ULAP- BASf� Basin Dimensions Basin Size 1rt. R Li� h. = 4 1, 1 q 4 sq. ft. (hollouh dinlensionc) Basin Volume Provided )ILt1;1.5 c.f. , -rV ELEu-A-rho,J IU,$I r^lgoD nt(, otp SToRA4E v Basin Elevations Bottom Elevation q •0 fllsl Storage Elevation I O • S fmsl Top Elevation Pntm MAN. FXCLP( A-t 00FRFLag1 Fonn SWU-103 Rev3.99 Page I 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 2 H . 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 Storinwater Management Permit Application Form, the agent may initial below. Attach justification if a requirement has not been met. Applicants Initials \JE� a. System is located 50 feel from class SA waters and 30 feet from other surface waters. �lfo b. System is located at least 100 1ect froin water SUPPly Wells. Ve(j_ c. Bottom ol'system is at least 2 feet above the seasonal high water table. \Sg�j d. Botroin of tire system is 3 feet above any bedrock Ol- impervious SOII horizon. Q fLS_ e . System is not sited oil or in fill material or DWQ approval has been obtained. f. System is located in a recorded drainage casement ('or the PlArposes of operation and maintenance and has recorded access casements to the nearest public right-of-way. FACO Drainage areaSfor tile device is less than 5 acres.eN.�, It. Soils have a inininium hydlaLdic conductivity of 0.52 inches per 11OUr and soils report is attached. I . System C-ZlPtUres and infiltrates the runofTfrom the first 1.0 inch of'rainfall (1 .5 inch event f'or areas draining to SA waters ). Design volume and infiltration calculations attached. VVIS j. System is sized to take into aCCOLlut the runoffat the ultimate built-OUt potential from all surfaces draining to the system, including any off -site drainage. Calculations attached. JCW k. All side slopes stabilized with vegetated cover are no steeper than 3: 1 (H:V). qXW 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or sediment trap is provided. ul" ni. Bottom ofthe device is covered with a layer of c1can sand to all average depth of 4 inches or dense vegetative cover is provided. \'J� it. Vegetated filtcr is provided for overflow and detail is shown on plans (Required luinillu.1111 length is 50 feet for SA waters, 30 feet for other waters). VIEW o. Flow distribution mechanism within the basin is provided. �Sfw p. A benchmark is provided to determine the sediment accumulation in the pretreatment device. � 11A cl. RUIlOffin excess ofthe design volume bypasses off-line systems (bypass detail provided). ylr�s r. System is desigricd 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. JJELJ s. Plans ensure that the installed system will nicet design specil'ications (constructed or restorcd) upon initial operation once the project is complete and the entire drainage area is stabilized. FormSWU-103 Rev3.99 Page 2 of 3 IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT I . 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 750K ofthe original design depth. The system shall be restored to tile original design depth without over -excavating. Over-cxcavating 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. 9.5 '�SL) "I -8�6 1-i When the design depth reads S k�*'feet in the pr4tFefttment-mti+, 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 Address: Note: The lc�4y '�j resident of the -F. 1�'vy'(Drj QP 6T- U o -:�539 — Date:— (".1;La should not be a homeowners association unless more than 50% of the lots have been sold and a been named the president. I, S�-w'DY-) P. N\ , a Notary Public for the State of .1 County of r—S do hereby ceilify that personally aliPeated befoie me this and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Ni y commission expireMy Commission Expires March 26, 2('105 Page 3 of 3 "I LANDMARK ENGINEERING & ENVIRONMENTAL, P.C. P.O. Box 1190 KITTY HAWK. NC 27949 PHONE 252.255.5127 FAX: 252.255.0992 January 5, 2004 RECEIVED Mr. Bill Moore FEB 13 2004 NCDE&NR Division of Water Quality 943 Washington Square Mail DWQ-WARO Washington, NC 27889 Re, Stormwater Management Plan Permit Application Package Revisions City Beverage Storage Units Manteo, Dare County, NC Dear Mr. Moore: On behalfof City Beverage Company, Inc., Landmark Engineering & Environmental, P.C. is submitting for your review and approval a revised Stormwater Management Plan Permit Application packagc for the above I eferenced site. Included in the package are the following: 1.) A propei ly executed original Stormwater Management Permit Application form and one copy. (Revised per review comments) 2.) A property executed original Infiltration Basin Supplement and one copy. (Revised per review comments) 4.) A copy of the Stormwater Management Plan Design Narrative. (Revised per review Comments) 5.) A copy ofthc Stormwater Management Plan Design Calculations. (Revised per review Comments) 6.) Two copies of the Slormwater Management Plan, (sheet C-1). (Revised per review comments), and two copies of the approved Sedimentation and Erosion Control plan. A review fee check was previously submitted in the original application package dated October 1, 2003. Thank you for your time and attention to this matter, Please contact me at (252) 255-5127 with any questions you may have oradditional information you require. Sincerely, Landmark E-riginecring & F n v iron mental. P.C. V ictor(Abitc�cl cc: Mi. J. T. Dixon - Cit ' V Beverage CompanY Mr. Steve Shrivei, P.E. - Dare CountY Engineer LANDMARK ENGINEERING & ENVIRONMENTAL, P.C. P.O. Box 1190 KITTY HAWK, NC 27949 PHONE: 252.255,5127 FAX: 252.255.0992 RECEIVED CITY BEVERAGE STORAGE UNITS FEB13 2004 Stormwater Management Plan Design Narrative DWQ-WARO Revised 1/5/2004 The above referenced site is proposed to be developed as a commercial storage units with associated parking and infrastructure. The site is located off of Driftwood Drive, in Mantco, Dare County, North Carolina. City Beverage Co, Inc. (owner/developer) has asked Landmark to design an infiltration basin to store the storinwater 1111101717 from impervious surfaces of the proposed storage buildings and associated infrastructure, City Beverage Co, Inc. has also asked Landmark to design the infiltration basin to accommodate storinwater runoff at the ultimate build Out Of the storage building units property, (drainage area 1), as well as the ultimate build Out of their adjacent property, which operates as a distribution center, (drainage area 2). The distribution center property will not be tied in to the storruwater system during tile construction of the storage units and infrastructure shown on the enclosed plans. Future development of the distribution center will include the grading and infrastructure required to convey both the new impervious coverage on the distribution center property and existing impervious coverage to the MaXirul,im extent possible. infiltration basin. Drainage Area I includes drainage from both the proposed storage building (15,248 sq.ft.)and pavement (53,173 sq.ft.), as shown on the attached plans, and potential future expansion at the site. The Future expansion will entail additional storage unit buildings, (approx. 10,000 sq.ft.) and associated pavement, (approx. 25,450 sq.ft.). Total anticipated impervious coverage in drainage area I will be 103,871 sq,ft., which equates to 60% impervious coverage in drainage area 1. Storrnwatcr from Drainage Area I will be conveyed by sheet now into the proposed infiltration basin and swale system. At build Out, drainage Area 2 will include stortriwatcr runoff from both the existing distribution center building (32,297 sq.ft.)and existing pavement (37,967 sq.ft.), as shown on the attached plans. Future expansion at the distribution center property will add additional impervious coverage from building expansion, (approx. 16,149 sq.ft.) and additional pavement, (approx. 30,249 sq.ft.). Total anticipated impervious coverage in drainage area 2 will be 116,662 sq.ft., which equates to 50 % impervious coverage in drainage area 2. Storinwater from Drainage Area I is anticipated to be conveyed by both shect flow and catch basins/piping into the infiltration basin and swale system. The infiltration basin will provide at build out in excess of 6.2 inches ofstorage ofstonnwatcr runoff from the impervious Surfaces detailed above. Storrnwater in excess ofthis volume will overflow via a grassy spillway to the NCDOT Right of Way. M1 vo (2) LANDMARK ENGINEERING & ENVIRONMENTAL, P.C. CITY BEVERAGE STORAGE UNITS STORMWATER MANAGEMENT PLAN DESIGN CALCULATIONS Revised 1/2/04 Seasonal high water table @ 7.0 ft. MSL (conservative) Soil voids available for storage above s.tim:r. - (0.2) Design Storm - 1.5" = 0.12 ft. Runoff coefficient for impervious area -c=0.95 P.O. Box 1190 KITTY HAWK. NC 27949 PHONE: 252.255.5127 FAX: 252.255.0992 RECENEU FEB 1 2 2004 DWQ-WARO Impervious coverage 0a Build Out = 5.06 acres (see attached coverage calculations) Volume of storage required = V, = Rq,d V, = (5.06Ac.) (43560 ft. 2 ) (0.95) (1.5 inches) ( I ft. R,q d I acre 12 inches = 26,188 ft.' Volume o1storage provided - (A.) ONSITE INFILTRATION BASIN i) Contour Areas (Calculated by Autocad ) I-LEV. CONTOUR AREA 9.0 ft. 41,144 ft. 2 10. 0 ft. 60,881 ft.2 10.5 it. 73,682 ft. 2 11.0 ft. 88,586 ft. 2 Volume of Storage in basin ELEV. CUMULATIVE STORAGE 10.0 ft. 51,012 ft 3 10.5 ft. 84,653 ft 3 11.0 ft. 125,220 ft 3 . . . . . . . . . . . . 0 10 SS1 L 025283 N R E. ll,$# it %%%%% r LANDMARK ENGINEERING & ENVIRONMENTAL, P.C. P.O. Box 1190 KITTY HAWK, NC 27949 PHONE: 252.255.5127 FAX: 252.255.0992 iii) VO ILI Me of Stoi age in soi I voids below basin and above S I I WT 10.5 - .0 (Storage in soil voids above S.H.W.T.) 73,682 ft. 2 x 2 ft x 20% = 29,472.8 ft.3 (C.) Total Storage Provided to 10.5 ft. 84,653 ft.' + 29,472 ft.3 � 114,125 ft.' 114,125 ft.3 >- 26,188 ft.' We are storing in excess of6.2" @ Build Out with the top of storage Gc 10.5 I't. This is conservative as we are not accounting for infiltration/movement ofstormwater with the exception offilling the soil voids above the water table. The infiltration basin is design to account for runoff from all impervious surfaces at the ultimate build out of the subject property as well as build out of the adjacent property owned by City Beverage, (distribution center). This adjacent property houses part of the infiltration basin for the project. Future development on the distribution center property will include the grading and infrastructure necessary to convey both runoff from new impervious surfaces as well as the currently existing impervious areas to the infiltration basin. I wN !Jil�'�� �k 44 111MW- N LANDMARK ENGINEERING & ENVIRONMENTAL, P.C. CITY BEVERAGE STORAGE UNITS Stormwater Management Plan Soils & S.H.W.T. investigation September 26, 2003 P.O. Box 1190 KITTY HAWK, NC 27949 PHONE: 252.255.5127 FAX: 252.255.0992 On July 15, 2003, representatives of Landmark Engineering & Environmental, P.C. traveled to the above referenced site to investigate the soils present in the proposed infiltration basin area and to make a detcrInination of the elevation ofthe Seasonal High Water Table. The findings are as follows: Soils observed in all three borings conducted on site are consistent with the Baymeade series of soils as mapped in the USDA, Soil Conservation Service's "Soil Survey of Dare County, North Carolina. The Bayrneade soils occur on sandy or loamy ridges in Manns Harbor and on Roanoke Island.small dunes or knolls, and are typically devoid of significant vegetation. The Newhan soils are present in the flats and depressions between the Done land soils, and have scattered pockets of salt tolerant vegetation. Soil profiles encountered during investigations are as follows: Boring Number I Boring Number 2 Boring Number 2 (Ground Elev. = 12.31+/-) (Ground Flev. = 11.2'+/- (Ground Elev. = 117) 0-6" Gray to dark gray fine sand, V-20" Light yellowish brown 04" Gray to dark gray fine sand, poorly graded, common root and fine sand. Poorly graded, few to poorly graded, common root and organic matter, distinct boundary common roots and opaque organic matter, distinct boundary (10YR 4/1) minerals, distinct boundary (I 0YR 4/1) (I OYR 6/4) 6"-28" Light yellowish brown 20"-28" Yellowish brown silty, 4"-24" Light yellowish brown Fine sand. Poorly graded, trace to clayey sand. Friable, few roots fine sand. Poorly graded, trace to few roots and opaque minerals, and opaque minerals (I OYR 5/6) few roots and opaque minerals, distinct boundary (10YR 6/4) distinct boundary (10YR 6/4) 28"-38" Yellowish brown silty 28"-66" Brown silty sand to fine 24"-36" Yellowish brown silty, sand, with some clay. Friable, sand. Strata coarsens with depth. clayey sand. Friable, lew roots trace roots and opaque minerals Trace roots and opaque minerals and opaque minerals (10YR 5/6) (I 0YR 5/6) (1 OYR 5/4) S.H.W.T. indicators - @ 6.5'msl, Free water @ 6.0'msl 38"-66" Brown silty sand to fine 36"-66" Yellowish brown fine sand. Strata coarsens and has sand, coarsening with depth. fewer fines with depth. Trace Trace opaque minerals (I 0YR roots (I 0YR 514) SILW.T, 5/6) S.1-M.T. indicators 0a 6.8' indicators - very faint @ 67nisl. msl, Free water @ 6. P nnsl. Based on the investigation, the soils present conservatively have permeabilities at least an order of magnitude greater than the minimum required for infiltration. The S.H.W.T. elevations are conservatively based on the first observed low chroma mottles. These mottles may be caused due to capillary tension between soil granules. The actual S.l-LW.T is most likely several inches lower than stated in the table.