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HomeMy WebLinkAboutSW8000638_HISTORICAL FILE_20001127STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8OO�3�S DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS fA HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE 2C7pp 11 ZI YYYYMMDD J1111c all, Novih C,arollna 'Deplintment of Environment And Natural Resources Wilmington Regional Office James 13. Hunt, Jr., Governor Bill Holman, Secretary Division of Watcr. Quality Mr. Steve Mann. Vice President North Carolina Coastal Developments. Inc. 15 Causeway Drive Ocean Isle Beach. NC 28469-0750 Dear Mr. Mann: November 27. 2000 Subject: Permit No. SW8 000638 Ocean Isle West Destination Resort. Sec?. Phasc 3 1-ligh Dcnsity Stormwater Project Brunswick CountV the 'Ali lmingloll Regional Office received a complete Stormwater Management Permit Application for Ocean Isle West Destination Resort, Section 2. Phase 3. on October 13. 2000. Staff review ofthe plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 21-1.1000, We are forwarding Permit No. SW8 000638 dated November 27, 2000, for the construction of Ocean Isle West Destination Resort. Section 2. Phase 3. This permit shall be effective from the date of issuance until November 27, 2010, 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 ofthc storntwater managcmerrt system will result in future compliance problems. I f 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 I-learings. P.O. Drawer 27447. Raleigh. NC 27611-7447. Unless such demands are made this permit shall be final and binding. If VOL] have any questions. or need additional information concerning this matter, please contact Linda Lewis, or me at (910) 3.95-3900. Sincerely. RSS/arl: S:AWQS\STORMWA"I1P!RMI cc: Mark Arcuri. P.F. Rick Shiver Water QualiLv Regional Supervisor f\000638.N0V Ocean Isle Beach Building Inspections Department Linda Lewis Wilmington Regional Office Central Files 127 Cardinal Dr. Ext.. Wilmington. North Carolmn 2N405 Telephone 910395-3900 FAX 910-3511 20t1-1 An Fqunl Opportunit% Affu'nmive Action ISmpluyer 511'% rercelal/I11';6 pull -roost mer paper State Stormwatcr Management Systems Permit No. SW8 000638 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCFS DIVISION OF WATER QUALITY STATE STORMIN'ATER MANAGENIF.NT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions ofArticle 21 ofChapter 143, General Statutes ol'North Catalina as amended, and other applicahle Laws, RUIes, and Regulations PERMISSION IS UIFREBV GRANTED TO North Carolina Coastal Developments, Lne. Ocean isle West Destination Resort, Section 2, Phase 3 Brunswick Co-tudy FOR THE construction, opcfation and maintenance of an underground infiltration trench system in compliance with the provisions of 15A NCAC 21-1 .1000 (hereafter referred to as the "stormwater rules") and the approved stormwatel, 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 November 27, 2010 and shall be subject to the {allowing specified conditions and limitations: 1. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwatcr described in the application and other supporting data. 2. This stormwatcr system has been approved for the management ofstormwaler runoff as described on page 3 ofthis permit, the Project Data Shcet.'I'he stormwater control has been designed to handle the runoff from 96,304 square feet of impervious at-ca. This pond must be operated with a vegetated filter. 3. Approved plans and specifications for this project arc incorporated by reference and arc enforceable parts of the permit. 4. The u-act will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans. 5. No future development has been allotted for this project. 6. '['Ile runoff from all onsile and offsite built -upon arca permitted with this project must be directed into the permitted stormwater control system. 7. This trench system must be operated with a 50' vegetated filter. 2 Stale Slormwater Management Systems Permit No. SbV8 000638 DIVISION OF WATER QUALITV PRO.IECT DESIGN DATA SHEET Project Name: Ocean Islc West Destination Resort, Section 2, Phase 3 Permit Number: SW8 000638 Location: Brunswick COnntV Applicant: Mr. Steve Mann. Vice President Mailing Address: North Carolina Coastal Developments, Inc. 15 Causeway Drive Ocean Isle Beach, NC 28469-0750 Application Datc: Name of Receiving Stream/Index it: Classification of Water Body: IfClass SA, chloride sampling results Trench Dimensions, LxWNI-I ,feet: Permanent Pool Elevation, FMSL: Drainage Area, acres: Total Impervious Surfaces, ft': Offsite Area entering Pond, ft2: Required Storage Volume, ill: Provided Storage Volume, ft': Temporary Storage Elevation, FMSL: Controlling Orifice: Type of Soil: Expected Hydraulic Conductivity: Seasonal High WaterTabla Time to Drawdown: October 13, 2000 Atlantic Ocean / (IMR 99-1) "Sill, n/a 2.11Tx47x2.5' 5.7 2.24 96,304 none, per Engineer 11,444 1 1,487 8.2 n/a-overflow bypass to vegetated filter Sand 7" per hour 3.7 FMSL. 2 hours 3 State Stormwatcr Management Systems Permit No. SW8 000638 IL SCHEDULE OF COMPLIANCE ']'lie stormwater management system shall be constructed in it's entirely, vegetated and operational for its intended use prior to the construction of any built -upon surface. During consUIuction, erosion shall be kept to a minimum and any eroded areas ofthe system will he repaired immediately. 'file 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 maintcnancc must occur at the scheduled intervals including, but not limited to: It. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of'side slopes. d. Immediate repair of eroded areas. C. Maintenance ol'side slopes in accordance with approved plans and specifications. F. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping. g. Access to the outlet structure must be available at all times. h. The vegetated filter will be kept grassed with no crosion. The spreader mechanism will be kept free of sediment and trash, and must distribute the runoff evenly over the width of the filter. 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 ofperson performing the work and what actions were taken. 5. The facilities shall be constructed as shown on the approved plans. "Phis permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. The stormwater, system may not be used as a temporary Erosion Control device. The following items will require a modification to the permit, prior to construction a. Any revision to the approved plans, regardless of'size. b. project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area. C. Purthersubdivision,acquisition,orsalcofthcprojectarea.Thcprojectareaisdefinedasallproperty owned by the permittec, for which Sedimentation and Erosion Control Plan approval was sought. f. Pilling in, altering, or piping of any vegetative conveyance shown on the approved plan. 9. The Director may determine that other revisions to the project should require a modification to the permit. 10. A copy of the approved plans and specifications shall be maintained on file by the PCrnlillee fora minimum often years from the date of the completion of construction. 11. 'file permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -upon area. Slate Stormwater Management Systems Permit No. SW8 000638 12. Prior to the sale of any portion of the property, an access/maintenance easement to the stormwater facilities shall be granted in favor of the permittce if access to the stormwater facilities will be restricted by the sale of any portion of the property. 13. The Director may notify the permittce when the permitted site does not meet one or nuireofthc minimum rcquiremcnts of the permit. Within the time frame Specified in the notice, the permittce Shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. 'file permittce shall provide copies of revised plans and certification in writing to the Director that the changes have been made. 14. The permitter shall notify the Division ofany name, ownership or mailing address changes within 30 days. Ill. GENERAL CONDITIONS This permit is not transferable. In the event there is it desire for the facilities to change ownership, or there is a name change of the Pcrmittec, it formal permit request must be submitted to the Division of Water Quality accompanied by an application Ice, 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. Failtu'e to abide by the conditions and limitations contained in this permit may subject the Pcrmittec to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. 3. The issuance ofthis permit does not pt'eclude the Permittee fi'om 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. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions. the Pcrmittec shall take immediate corrective action, including those as may be required by this Division. such as the consu'uction of additional or replacement stormwater management systems. 'file permittce grants DI3NR Staff permission to enter the property for the purpose of inspecting all components of the permitted stormwater management facility. The permit may be modified, revoked and reissued or terminated for cause. The fling of a request for a permit modification, revocation and reissuancc 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. Permit issued this the 27(h day of November, 2000. NORTH CAROUNA E'NVIRONMI3NTAI, MANAGFIMI.,NT COMMISSION Kerr T. Stevens, Director Division of Witter Quality 11), Authority of the Environmental Management Commission Permit Number SW8 000638 OFFICE USE ONLY Date Received Fec Paid Permit Number 10-13-2wo 1 1 5w8 00( Co38 State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may he photocopied far use as an original 1. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): North Carolina Coastal Developments, Inc. 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Steve Mann, Vice President 3. Mailing Address for person listed in item 2 above: 15 Causewav Drive City: Ocean Isle Beach State: North Carolina Zip: 28469-0750 Telephone Number: ( 91 4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Ocean Isle West Destination Resort- Section 2, Phase 3 5. Location of Project (street address): Ocean Isle West Blvd. (adjacent to Sand Castle Condos) City: Ocean Isle Beach County: Brunswick 6. Directions to project (from nearest major intersection): Travel East on NCSR 904 (Ocean Isle Beach Rd. SW) to its point of intersection with First Street. Turn right on First Street. Project is approx. 2.0 miles to the west and fronts Ocean Isle West Blvd. Adjacent to the 7. Latitude: 78 degrees 27' 30" Longitude: 33 degrees 52' 55" of project 8. Contact person who can answer questions about the project: Name: Steve Mann Telephone Number ( 910 ) 575-7771 H. PERMIT INFORMATION: 1. Specify whether project is (check one): x_New Renewal Modification FORM SWU-101 Version 3.99 Page I of ,2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number N/A 3. Specify the type of project (check one): and its issue date (il'known) Low Density X High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): X CAMA Major X Sedimentation/Erosion Control _ 404/401 Permit _ NPDES Stornnvater Note: Existing CAMA permit in place, see attached permit Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Stormwater will be treated by utilization of infiltration trenches for the first 1 '/2 inch of rainfall. Rainfall in excess of the first 1 '% inch will be routed through separate overflow pipinq to a grass swale as per NCDENR 2. Stormwater runoff from this project drains to the Eastern Channel/Lumber River basin. 3. Total Project Area: 3.52 acres 4. Project Built Upon Area: 2.21 acre 5. How many drainage basins does the project have? 2 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 1 Drainage Area 2 Receiving Stream Name Eastern Channel/ Lumber Eastern Channel/ Lumber Receiving Stream Class SA SA Drainage Area 97,629 SF = 2.24 AC 39,872 SF = 0.92 AC Existing Impervious* Area 0 SF 0 SF Proposed Impervious* Area 54�F-=-9.832-",C q(p 304 Sr 0 AC % Impervious* Area (total) 98.6% 0 % Impervious* Surface Area Drainage Area I Drainage Area 2 On -site Buildings 16185 SF 0 SF On -site Streets 0 SF 0 SF On -site Parking 78319 SF 0 SF On -site Sidewalks 1800 SF (inc. sidewalk & HC Ramp) 0 SF Other on -site 0 SF 0 SF Off -site 0 SF 0 SF Total: Y=96,304 SF = 2.21 AC 1=0 SF = 0 AC *Impervious area is defined as the built upon area including, b,d not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. FORM SWU-101 Version 3.99 Pare 2 of How was the off -site impervious area listed above derived? No offsite impervious 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 connplicmce with stcrte stornnvcuer ntcumgennent permit number N/A 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 A'/A square feet of any lot shall be covered by structures or impervious materials. I npervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but clo not include wood decking or the crater surface of swinnning pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. d. Built -upon area in excess of the permitted amount requires a state stortmvater management permit modification prior to construction. 5. All permitted runofffi'mn outparcels or future development shall be directed into the permitted.stormwater control system. These connections to the stornnvater controlsystent .shall be petformed 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 clairriing 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 StorniNvater 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. I. 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 • One copy of the applicable Supplemental Fornt(s) for each BMP • Permit application processing fee of $420 (payable to NCDENR) • Detailed narrative description of stormwater treatment / management • Two copies of plans and specifications, including: — Development / Project name — Engineer and firm — Legend — North arrow — Scale — Revision number & date — Mean high water line — Dimensioned property / project boundary — Location map with names 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 basins delineated — Vegetated buffers (where required) VI►. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they map provide information on your behalf, please complete this section. Designated agent (individual or firm): McKim and Creed P.A.- Mark T. Arcuri PE Mailing Address: 243 North Front Street City: Wilmington State: North Carolina Zip: 28401 Phone: ( 910 ) 343-1048 Fax: ( 910) 251-8282 Vill. APPLICANT'S CERTIFICATION I, (prim or type name ofperson listed in General Information, item 2) Steve Mann , 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 1 5A NCAC 21-1.1000. Signature / Date FORM SWU-101 Version3.99 Page4of4 Permit No.5w'y COO Co 3 8 (to be provided by DIVQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM UNDERGROUND INFILTRATION TRENCH SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes a stormwater management permit application, an underground infiltration trench supplement for each system, design calculations, and plans and specifications showing all stormwater conveyances and system details. I. PROJECT INFORMATION Project Name Ocean Isle West Destination Resort Sec 2 Phase 3 Contact Person: Steve Mann - VP Phone Number: (910) 575-7771 For projects with multiple infiltration systems, a supplement form must be completed for each system. This worksheet applies to: Trench NA in Drainage Area (from plans) (fiom Form SWU-101) ONLY ONE SYSTEM I1. DESIGN INFORMATION (attach supporting calculations/documentation): Soils Report Summary (based upon an actual field investigation and soil borings) Soil Type sand, single grained Infiltration Rate 14 in/hr r cf/hr/sf (circle appropriate units) SHWT Elevation 3.7 fmsl (Seasonal High Water Table elevation) Trench Design Parameters Design Volume 11,439 c.f. Design Storm 1.5 inch event (1.5 inch event for S.4 waters, I inch event for others) Drawdown Time 0,083 days ( 2 hours) Perforated Pipe Size 1 5 inch diameter Perforated Pipe Length 2113 ft. (does not include 2' @ each pipe end) No. Observation Wells NA (mcry be required on a case-bv-case basis) Stone Type (if used) # 5 7 Stone Void Ratio a n s Trench Elevations (infect mean sea level) Bottom Elevation 5.7 fmsl Storage/Overflow Elevation 8 . 2 fmsl Fom SWU-107 Rev 3.99 Page I of 4 Trench Dimensions Height Width 2.5 4.7 ft. III. REQUIRED ITEMS CHECKLIST Length Volume Provided 2113 ft. 11,486 cu.ft. The following checklist outlines design requirements per the Stormwater Best Management Practices manual (N.C. Department of Environment, Health and Natural Resources, November 1995) 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 N 1 Jk a. System is located 50 feet from class SA waters and 30 feet from other surface waters. p!y i b. System is located at least 100 feet from water supply wells. M (c. Bottom of system is at least 2 feet above the seasonal high water table. Mt A d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon. H e. Off-line system, runoff in excess of the design volume bypasses the system (bypass detail provided). t ¢ f. System is designed to draw down the design storage volume to the proposed bottom elevation under seasonal high water conditions within five days based upon infiltration through the bottom only (a hydrogeologic evaluation may be required). M I A g. Soils have a minimum hydraulic conductivity of 0.52 inches per hour. Nx 1 A h. System is not sited on or in fill material or DWQ approval has been obtained. 1 A i. 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. t A 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. &l t P- k. 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. M t 1. System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event for areas draining to SA waters ). 1 A m. Drainage area for the device is less than 5 acres. M (A- n. A pretreatment device ( filter strip, grassed Swale, sediment trap, etc.) is provided. M 1 ik- o. Trench bottom is covered with a layer of clean sand to an average depth of 4 inches. M ({� p. Sides of the infiltration trench are lined with geotextile fabric. M k {i q. Rock used is free of fines (washed stone) and has a large void ratio. NA r. Side to bottom area ratio is less than 4: 1. Fonn SWU-107 Rev 3.99 Page 2 of 4 lN� s. Observation well(s) are provided (case -by -case basis). ►js i i� t. Vegetated filter is provided for overflow (50 feet for SA waters, 30 feet for other waters) and detail is shown on plans. M 1 u. A benchmark for checking sediment accumulation is provided. IV. UNDERGROUND INFILTRATION TRENCH OPERATION AND MAINTENANCE AGREEMENT 1. After every runoff producing rainfall event and at least monthly inspect the bypass/overflow structure for blockage and deterioration and the infiltration system for erosion, trash accumulation, grass cover, and general condition. 2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash and blockages as needed to maintain system performance. 3. Remove accumulated sediment annually or when depth is reduced to 75%, of the original design depth. Restore depth to 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. 4. The water level in any monitoring wells will be recorded after a 1 inch rainfall event and at least once a month. Chronic high water table elevations (within 1 foot of the bottom of the system for a period of three months) shall be reported to DWQ immediately. 5. If DWQ determines that the system is failing, the system will immediately be repaired or replaced 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. 6. Remove accumulated sediment from the infiltration system annually or when depth in the 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 infiltration system. 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 depth at the benchmark reads see belothe accumulated sediment shall be removed from the system. DI1 5.35 ft depth D72 5.15 ft depth D13 5.15 ft depth Form SWU-107 Rev 3.99 Page 3 of 4 I acknowledge and agree by my signature below that I am responsible for maintaining the stormwater collection system in accordance with the six 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: Steve Mann, Vice President Address:15 Causeway Drive, Ocean Isle Beach, NC 28469-0750 Phone: 910-5754-7 - 771.d n _ Date: 10/13/00 IVOte: The legally responsible party should not be a homeowners association unless nmre than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, 22' r1Gn0.� WAW D4, "�At�Notary Public for the State of n Ul k UkD"k , County of U NLMDWI Oe , do hereby certify that QED.O i) •mm"'e-) personally appeared before m��11e this �) day of 0600 Fn d.o 0 0 , and acknowledge the due execution of the forgoing infiltration basin maintenance requirements. Witness my hand and official seal, �nr+ sr,�///// 'OLT:?p� .�rlt My connuission expires 0MD - 0�-') 9'A Boo �s Pomt SWU-107 Rev 3.99 Page 4 of 4 �MCIQM&CREED TO: NCDENR 127 Cardinal Drive Extension Wilmington, NC 28405-3845 ATTENTION; Ms. Linda Lewis nC.;t rVL;15 OCT 4 3 2000 0wV \ LETTER OF TRANSMITTAL OATE: October 13, 2000 PROJECT NO. 01566.0007 (40) TASK NO' REST RED Ocean Isle West Destination Resort Section 2, Phase 3; Islander Resort TRANSMITTAL NO TRANSMIT PAGE 1 OF 1 WE ARE SENDING: ❑ Originals ® Prints ❑ Shop Drawings ❑ Samples ❑ Specifications ® Calculations ® Other -Application Quantity Drawing No. Rev. Description Status 1 Cover Letter dated 10/12/00 1 Original Stormwater Management Permit Application Form G 2 Copies Stormwater Management Permit Application Form G 1 Original Infiltration Trench Supplement G 2 Copies Infiltration Trench Supplement G 2 Design Narrative and Supporting Calculations, Revised October 2000 G 2 CE101 Grading, Drainage, & Erosion Control Plan dated 6/7/00, rev. 10/10/00 G 2 CE501 Site & Erosion Control Details dated 6/7/00, revised 10/13/00 G Issue Status Code: A. Preliminary B. Fabrication Only C. For Information D. Bid E. Construction F. For Review & Comments G. For Approval H. See Remarks Action Status Code: 1. No Exceptions Taken 2. Make Corrections Noted 3. Other 4. Amend & Resubmit 5. Rejected - See Remarks REMARKS 243 N. FRONT ST, WILMINGTON, NC 28401 9101343-1048 FAX 9101251-8282 CC' D. Williamson w/ enclosures cKIM CREED, PA S. Mann w/ enclosures Herb McKim/Trans & letter File Signed Mark Arcuri, E Project Engineer S^\01566\0007\club aouse\10.mm\101300 NCOENR LindaL"is Trans.doc DESIGN NARRATIVE FOR STORMWATER MANAGEMENT PERMIT AND SUPPORTING CALCULATIONS OCEAN ISLE WEST DESTINATION RESORT SECTION 2, PHASE 3 ISLANDER RESORT Ocean Isle Beach Brunswick County, North Carolina Prepared for: North Carolina Coastal Developments, Inc. 15 Causeway Drive Ocean Isle Beach, NC 28469-0750 (910) 575-7771 June 2000 Revised October 2000 McKim & Creed 01566-0007 (REST) (20) jd,/3-00 Prepared by: McKim & Creed, P.A. 243 North Front Street Wilmington, NC 28401 S:\01566=0]\club house@0-tech\stormwaterdesignnarritivaaoc :00"04 IL ( ,'s OCT 113 2000 DWQ PROD# DESIGN NARRATIVE 1. GENERAL The project site is located in the town of Ocean Isle, North Carolina. The site is bounded on the north side by Ocean Isle West Boulevard (West Second Street). It is bordered by residential lots to the east and west. The proposed lot size where the beach club will reside is approximately 3.52 acres. The intent of this project is to design and construct a new beach club, restaurant, pool, and parking area for this tract of land. This is an application for a site specific storm water permit under the general storm water permit SW8 990109. 2. EXISTING SITE The existing site is approximately 3.52 acres in size and presently sand and undisturbed. There are not wetlands present on site. There is no clearing and grubbing necessary on this site. 3. PROPOSEDIMPROVEMENTS The majority of the improvements are associated with the construction of the actual building and parking lot area. Utility improvements include the installation of new water service line and fire sprinkler line. There will be a sanitary sewer service. Both water and sewer will tie-in to an existing public water and sewer main. Proposed storm water catch basins and piping will be constructed for the parking lot area and infiltration trenches will be constructed for storm water management purposes. See attached calculations and drawing for more detail. 4. EROSION CONTROL CONSIDERATIONS Erosion control considerations are integrally tied to the existing storm drain system. All storm drain inlets will be protected with silt fence inlet protection to eliminate sediment migration through the storm drain system. In addition, silt fencing will be located on the low side of the affected areas which will not impede the flow of storm water. Any proposed drainage swales will be properly lined with erosion control matting if necessary. A temporary construction entrance will be located as close to the entrance/exit point of the new work area. 5. MAINTENANCE CONSIDERATIONS Contractors shall be responsible for periodic inspection and maintenance of all indicated erosion control devices. In addition, inspection and any necessary maintenance will be required immediately following any significant storm event. Catch basin inlets will be used as pretreatment devices. Benchmark depths are noted on the application supplement that will document when the pretreatment devices will need to be cleaned out. Any measure that fails to function as intended shall be repaired immediately. Upon completion of construction, the property owner shall be responsible for site maintenance. S'A015660007t luS houset20-teUWormwaterdesignnarritive do0 6. DESIGN APPROACH Storm water treatment will be implemented through an underground infiltration trench sized to store the required 11,439 cubic feet of storm water volume. Soil tests performed by Land Management Group, Inc. on May 18, 2000 indicate that the infiltration rate of the soil in this affected area is 14 in/hr. The design uses a safety factor of 2.0 equating a rate of 7.0 in/hr. In addition this soils report indicates that the seasonal high water table is roughly 3.7 feet above mean sea level. This report is included in this submittal for your review. The designed infiltration trench will be designed such that the trench will sit 2 feet higher than the seasonal high water table (per NCDENR's Best Management Practices). The infiltration system will use 2113 linear feet of 15 inch perforated pipe surrounded with 4.7 ft. by 2.5 feet of #57 washed stone in a filter fabric envelope. The total storage volume provided is 11,486 cubic feet, more than the required 11,439 cubic feet. Storm water will enter the system through 3 grated inlets arranged in the parking lot. These inlets will be protected from silt and sediment during the construction stage and until permanent vegetation is established. Storm events in excess of the 1.5" storm will discharge through dedicated overflow piping to a grassed swale of at least 50 feet in length, adjacent to and east of the proposed building. The overflow water is separated from the first 1.5 inch by setting the inverts of the overflow piping at elevation 8.2 (top of the trench) or higher. See the plan for details. SA01566\0007\club houset20-tech\slormwaterdesignnarritive. doc CALCULATION PROJECT o 1 S7, �ccg-PA CLIENT SUBJECT '-;"(o ZM W A--(� I7 GA (,Cfj �2GST)Cz_ o� PROJ. NO, ' S 6 _d o @) % DATE f- L ?L�t7 DES. BYA 1 � CHK. BY REMARKS �(o�MW AcZzZ�fic�7Mt,NT es1 VFT E1J cal `f7 19 7� v 3 I = = 1 Per =1,4 i ou 3 SON i✓ J_o � �S o , -17 �T 'rz. =v u�F� nt 7tFar,)� A� PEZ NC.��t/rZ �iuf? I-T at - l-� 4-�`1�713 OHili 7,_loZ9Z vMcKU\4&CREED CALCULATION PROJECT C:Ku tss7 2/,;r, Si- G= T�" 3 CLIENT SUBJECT S-t'�ZtAWA-7eZ. GA"LX--/ PROJ. NO. ej-566p-GLJO% DATE i DES. BY tA0 l CHK. BY l/ u j L ,Zc.UGd Vol L IEi ,�_ "D_ l REMARKS z�L �/'oIuMG �onG 2►_r3r-r_�-�� Ir l�o,cis ==zs� = 3 -i�3 Ll irk: ltS IZ, voc-urvt_E H q��quR GA �ulj&r16 1-A&14 /_lDel 6-8.E_ .. +2 - 2 ���� 'kG/orZ -DQAwDowIJ TL!t�� T � _ C n_ v,MCKJTW&CREED CALCULATION PROJECT fll1tJ pLv7. �GGJC `VN : 'j PROJ. NO. CLIENT SUBJECT 610P,AAW4-05,Q MLOISI 6;-s-()coo) Nr�y-0007 DATE /0 / Z 0 DES. BY M A- IS CHK. BY REMARKS rOY2 S�oiZM �E,fj No7 �.o_l�d-F�isFi7CL.�l Z ru�Z vE� , N.u.0 F 57�2M_W-Al L-. t W (�vF.TLrAi Iti?RIc�Let - Mom CI1rj 12A!inl NaC.D, 6r 'f'WPTAJ T�► ► ✓oi2��ppJ v� Io7A-L TPx•���f' 'ro 3-��. T�t� oral}SS_I�—oN Voli--� ix� ES �Ndl �-1—N plc T 1C0_L wt 1't con. oN.E• �2 � • Pt.�c,�( �b1GfL ►-ru � T l+ Pe r orLr / � EI N T2�n/C.E+ r� i -rile lv . �� _ V, _� �j�p�o o N vMCKW&CREED CALCULATION PROJECT ,7AvJ V65(. -06r. `xG1C 'rFF 3 CLIENT F PROJ. NO. d l (O/o DATE I o 1 Z ba SUBJECT S,7mZM W *71E.JZ CALA!� -? DES. BY kK-(A� CHK. BY M MOMMMMMMMMMMMMMEM PM MMMMOMMMMMEM 0 SOMEONE 0 ME MEMO v,McIQM&CREED REQUIRED VOLUME TO TREAT FIRST 1.5 INCH = 11.439 CUBIC FEET IZ6gaI fZL� Givens: Stone Voids (void cf/total co Pipe Length (ft) Pipe Size (in) trench width (ft) trench height (ft) Calculated Stuff: Pipe Volume (cf) Stone Volume (cf) Total Volume (cf) Trench Volume proportions Drainage Area DI1 29511 D12 26721 D13 41397 Totals 97629 0.4 2113 15 4.7 2.5 2592 8894 11486 o K- Proportional Volume 3472 3144 4870 11486 /}rvA-L..rsiI S C4:::- '3 VIZ C) Hydrograph Summary Report Page 1 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to peak (min) Volume (cult) Return period (yrs) Inflow hyd(s) Maximum elevation (ft) Maximum storage (cuft) Hydrograph description 1 Rational 3.42 1 10 2,050 10 ---- ------ ------ DI1 2 Rational 3.46 1 10 2,077 10 ---- ------ ------ DI2 3 Rational 5.39 1 10 3,234 10 ---- ------ ------ DI3 4 Reservoir 0.00 1 20 0 10 1 7,16 2,0511 ROUTE 1 5 Reservoir 0.00 1 20 0 10 2 7.35 2,077 ROUTE 2 6 Reservoir 0.00 1 20 0 10 3 7.36 3,234 ROUTE 3 2of� I tow —o iL No -r:w a �n r , Proj. file: FINAL.GPW OF file: WilmlDF.IDF Run date: 10-12-2000 Hydrograph Report Hyd. No. 1 DI1 Page 1 English Hydrograph type = Rational Peak discharge = 3.42 cfs Storm frequency = 10 yrs � Time interval = 1 min Drainage area = 0.7 ac Runoff coeff. = 0.8 Intensity = 6.30 in Time of conc. (Tc) = 10 min I-D-F Curve = WIImIDF.IDF Reced. limb factor = 1 Total Volume = 2,050 cuR Hydrograph Discharge Table Time -- Outflow (min cfs) 1 0.34 2 0.68 3 1.03 4 1.37 5 1.71 6 2.05 7 2.39 8 2.73 9 3.08 10 3.4242 « 11 3.08 12 2.73 13 2.39 14 2.05 15 1.71 16 1.37 17 1.03 18 0.68 19 0.34 ... End Hydrograph Report Page 1 English Hyd. No. 2 D12 Hydrograph type = Rational Peak discharge = 3.46 cfs Storm frequency = 10 yrs Time interval = 1 min Drainage area = 0.6 ac Runoff coeff. = 0.9 Intensity = 6.30 in Time of cone. (Tc) = 10 min I-D-F Curve = WIImIDF.IDF Reced. limb factor = 1 Total Volume = 2,077 tuft Hydrograph Discharge Table Time -- Outflow (min cfs) 1 0.35 2 0.69 3 1.04 4 1.38 5 1.73 6 2.08 7 2.42 8 2.77 9 3.12 10 3.46 11 3.12 12 2.77 13 2.42 14 2.08 15 1.73 16 1.38 17 1.04 18 0.69 19 0.35 ... End Hydrograph Report Page 1 English Hyd. No. 3 D13 Hydrograph type = Rational Peak discharge = 5.39 cfs Storm frequency = 10 yrs - Time interval = 1 min Drainage area = 0.9 ac Runoff coeff. = 0.9 Intensity = 6.30 in Time of conc. (Tc) = 10 min I-D-F Curve = WilmlDF.IDF Reced. limb factor = 1 Total Volume = 3,234 cuft Hydrograph Discharge Table Time -- Outflow (min cfs) 1 0.54 2 1.08 3 1.62 4 2.16 5 2.70 6 3.23 7 3.77 8 4.31 9 10 4.85 5.3939 « 11 4.85 12 4.31 13 3.77 14 3.23 15 2.70 16 2.16 17 1.62 18 1.08 19 0.54 End r Hydrograph Report Hyd. No. 4 ROUTE 1 Hydrograph type = Reservoir Storm frequency = 10 yrs Inflow hyd. No. = 1 Max. Elevation = 7.18 ft Storage Indication method used. Hydrograph Discharge Table Page 1 English Peak discharge = 0.00 cfs o�vJ Time interval = 1 min Reservoir name = Percentage of DIi -i-o Max. Storage = 2,050 cuft +reAA Total Volume = 0 cult Time Inflow Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Outflow (min) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs 2 0.68 5.73 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 3 1.03 5.77 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 4 1.37 5.82 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 5 1.71 5.88 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 6 2.05 5.97 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 7 2.39 6.06 0.00 ----- ----- ----- ----- ----- 0.00 8 2.73 6.17 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 9 3.08 6.30 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 10 3.42 << 6.44 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 11 3.08 6.58 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 12 2.73 6.70 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 13 2.39 6.82 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 14 2.05 6.91 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 15 1.71 6.99 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 16 1.37 7.06 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 17 1.03 7.11 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 18 0.68 7.15 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 19 0.34 7.17 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 20 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 21 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 22 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 23 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 24 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 25 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 26 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 27 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 28 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 29 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 30 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 31 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 32 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 33 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 34 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 35 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 36 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 37 0.00 7.18 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << Continues on next page... v Hydrograph Report Page 1 Hyd. No. 5 ROUTE 2 Hydrograph type = Reservoir Storm frequency = 10 yrs Inflow hyd. No. = 2 Max. Elevation = 7.35 ft Peak discharge = Time interval = Reservoir name = Max. Storage = English t� 0.00 cfs c;,l 1 min percentage of DSz b 2,077 cuft Storage Indication method used. Total Volume = 0 tuft Hydrograph Discharge Table Time Inflow Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Outflow (min) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs 2 0.69 5.73 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 3 1.04 5.77 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 4 1.38 5.83 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 5 1.73 5.91 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 6 2.08 6.00 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 7 2.42 6.10 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 8 2.77 6.23 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 9 3.12 6.37 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 10 3.46 << 6.53 0.00 ----- ----- ----- ----- ----- 0.00 11 3.12 6.68 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 12 2.77 6.82 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 13 2.42 6.95 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 14 2.08 7.05 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 15 1.73 7.15 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 16 1.38 7.22 0.00 ----- ----- ----- ----- ----- 0.00 17 1.04 7.28 0.00 ----- ----- ----- ----- ----- 0.00 18 0.69 7.32 0.00 ----- ----- ----- 0.00 19 0.35 7.34 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 20 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 21 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 22 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 23 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 24 0.00 7.35 << 0.00 - ----- ----- ----- 0.00 << 25 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 26 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 27 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 28 0.00 7.35 << 0.00 ----- ----- ----- 0.00 << 29 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 30 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 31 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 32 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 33 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 34 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 35 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 36 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 37 0.00 7.35 << 0.00 ----- ----- ----- ----- ----- 0.00 << Continues on next page y Hydrograph Report Page 1 English Hyd. No. 6 ROUTE 3 No Hydrograph type = Reservoir Peak discharge = 0.00 cfs ovt,pU� Storm frequency = 10 yrs Time interval = 1 min Inflow hyd. No. = 3 Reservoir name = Percentage D13 J-v Max. Elevation = 7.36 ft Max. Storage = 3,234 cuft +re 910ra9e indication method used. Total Volume = 0 cuff Hydrograph Discharge Table Time Inflow Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Outflow (min) cfs ft cfs cfs cfs cfs cfs cfs cfs cfs cfs 2 1.08 5,73 MID ----- ----- ----- ----- ----- ----- ----- 0.00 3 1.62 5,77 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 4 2.16 5.83 0.00 ----- ----- ----- ----- ----- ----- ----- 0,00 5 2.70 5,91 0.00 ----- ----- ----- ----- ----- ---- ----- 0,00 6 3.23 6.00 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 7 3.77 6.11 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 8 4.31 6.23 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 9 4.85 6.37 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 10 5.39 « 6.53 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 11 4.85 6.69 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 12 4.31 6.83 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 13 3.77 6.95 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 14 3.23 7.06 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 15 2.70 7.15 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 16 2.16 Z23 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 17 1.62 7.29 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 18 1.08 7.33 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 19 0.54 7.35 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 20 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- 0.00 << 21 0.00 7.36 « 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 22 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 23 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 24 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 25 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 26 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 27 0.00 7.36 << MID ----- ----- ----- ----- ----- ----- ----- 0.00 << 28 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 29 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 30 0.00 7.36 << 0.00 - ----- ----- ----- ----- ----- 0.00 << 31 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 32 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 33 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 34 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 35 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 36 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << 37 0.00 7.36 << 0.00 ----- ----- ----- ----- ----- ----- ----- 0.00 << Continues on next page... Reservoir Report Reservoir No. 1 - Percentage of DI1 Trench Pond Data Bottom area = 1388.0 sgft Stage / Storage Table Stage Elevation ft ft 0.00 5.70 0.25 5.95 0.50 6.20 0.75 6.45 1.00 6.70 1.25 6.95 1.50 7.20 1.75 7.45 2.00 7.70 2.25 7.95 2.50 8.20 Side slope = 0.0:1 Bottom elev. = 5.70 ft Contour area Incr. Storage Total storage sgft cuft cuft 1,388 0 0 1,388 347 347 1,388 347 694 1,388 347 1,041 1,388 347 1,388 1,388 347 1,735 1,388 347 2,082 1,388 347 2,429 1,388 347 2,776 1,388 347 3,123 1,388 347 3,470 Page 1 English Depth = 2.50 ft N mlo �;ET lAn t,%KE 'POND CT`1'P), -trS 1. 7, .,j G R-r�1G1 � V pill M�, Culvert / Orifice Structures Weir Structures [A] [B] [C] [D] [A] [B] [C] [D] Rise in = 0.0 0.0 0.0 0.0 Crest Len ft = 1000.00 0.00 0.00 0.00 Span in = 0.0 0.0 0.0 0.0 Crest El. ft = 8.20 0.00 0.00 0.00 No. Barrels = 1 0 0 0 Weir Coeff. = 3.33 0.00 0.00 0.00 Invert El. ft = 5.70 0.00 0.00 0.00 Eqn. Exp. = 1.50 0.00 0.00 0.00 Length ft = 40.0 0.0 0.0 0.0 Multi -Stage = No No No No Slope % = 0.00 0.00 0.00 0.00 N-Value = .013 .013 .000 .000 Orif. Coeff. = 0.60 0.60 0.00 0.00 Multi -Stage = ----- No No No Tailwater Elevation = 0.00 ft Stage /Storage /Discharge Table Note'. All outflows have been analyzed under inlet and outlet control. Stage Storage Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Discharge ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs 0.00 0 5.70 0.00 --- --- --- 0.00 --- --- --- 0.00 0.25 347 5.95 0.00 --- --- --- 0.00 --- --- --- 0.00 0.50 694 6.20 0.00 --- --- --- 0.00 --- --- --- 0.00 0.75 1,041 6.45 0.00 --- --- --- 0.00 --- --- --- 0.00 1.00 1,388 6.70 0.00 --- --- --- 0.00 --- --- --- 0.00 1.25 1,735 6.95 0.00 --- --- --- 0.00 --- --- --- 0.00 1.50 2,082 7.20 0.00 --- --- --- 0.00 --- --- --- 0.00 1.75 2,429 7.45 0.00 --- --- --- 0.00 --- --- --- 0.00 2.00 2,776 7.70 0.00 --- --- --- 0.00 --- --- --- 0.00 2.25 3,123 7.95 0.00 --- --- --- 0.00 --- --- --- 0.00 2.50 3,470 8.20 0.00 --- --- --- 0.00 --- --- --- 0.00 Reservoir Report Page 1 Reservoir No. 2 - percentage of D12 Trench English Pond Data Bottom area = 1257.5 sgft Side slope = 0.0:1 Bottom elev. = 5.70 ft Depth = 2.50 ft Stage / Storage Table Stage Elevation Contour area Incr. Storage Total storage ft ft sgft cult cuft 0.00 5.70yC 1,258 0 0 0.25 5.95 1,258 314 314 0.50 6.20 1,258 314 629 0.75 6.45 1,258 314 943 1.00 6.70 1,258 314 1,258 1.25 6.95 1,258 314 1,572 1.50 7.20 1,258 314 1,886 1,75 7.45 1,258 314 2,201 2.00 2.25 7.70 7.95 1,258 1,258 314 314 2,515 2,829 -I-��Z �o27i v/-1 2.50 8.20 1,258 314 3, i 44-K Culvert / Orifice Structures Weir Structures [A] [B] [C] [D] [A] [B] [C] [D] Rise in = 0.0 0.0 0.0 0.0 Crest Len ft = 300.00 0.00 0.00 0.00 Span in = 0.0 0.0 0.0 0.0 Crest El. ft = 8.20 0.00 0.00 0.00 No. Barrels = 1 0 0 0 Weir Coeff. = 3.33 0.00 0.00 0.00 Invert El. ft = 5.70 0.00 0.00 0.00 Eqn. Exp. = 1.50 0.00 0.00 0.00 Length ft = 40.0 0.0 0.0 0.0 Multi -Stage = No No No No Slope % = 0.00 0.00 0.00 0.00 N-Value = .013 .000 .000 .000 Orif. Coeff. = 0.60 0.00 0.00 0.00 Multi -Stage = ----- No No No Tailwater Elevation = 0.00 ft Stage / Storage / Discharge Table Note'. All outflows have been analyzed under inlet and outlet control. Stage Storage Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Discharge ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs 0.00 0 5.70 0.00 --- --- --- 0.00 --- --- --- 0.00 0.25 314 5.95 0.00 --- --- --- 0.00 --- --- --- 0.00 0.50 629 6.20 0.00 --- --- --- 0.00 --- --- --- 0.00 0.75 943 6.45 0.00 --- --- --- 0.00 --- --- --- 0.00 1.00 1,258 6.70 0.00 --- --- --- 0.00 --- --- --- 0.00 1.25 1,572 6.95 0.00 --- --- --- 0.00 --- --- --- 0.00 1.50 1,886 7.20 0.00 --- --- --- 0.00 --- --- --- 0.00 1.75 2,201 7.45 0.00 --- --- --- 0.00 --- --- --- 0.00 2.00 2,515 7.70 0.00 --- --- --- 0.00 --- --- --- 0.00 2.25 2,829 7.95 0.00 --- --- --- 0.00 --- --- --- 0.00 2.50 3,144 8.20 0.00 --- --- --- 0.00 --- --- --- 0.00 Reservoir Report Page 1 Reservoir No. 3 - Percentage DI3 Trench English Pond Data Bottom area = 1948.0 sgft Side slope = 0.0 1 Bottom elev. = 5 70 ft Depth = 2.50 ft Stage I Storage Table Stage Elevation Contour area Incr. Storage Total storage ft ft sgft tuft Cuft 0,00 5.70 1,948 0 0 0.25 5.95 1,948 487 487 0,50 6,20 1.948 487 974 0.75 6,45 1,948 487 1,461 1.00 6.70 1.948 487 1.948 1.25 6,95 1,948 487 2,435 1.50 T20 1,948 487 2,922 1.75 2,00 7,45 7.70 1,948 1,948 487 487 3,409 3,896 2.25 2,50 7.95 1,948 1,948 487 4,383 8.20 487 4,870 - ��� ��� l,( Culvert I Orifice Structures Weir Structures [A] [B] [C] [D] [A] [B] [C] [D] Rise in = 0.0 0.0 0.0 0.0 Crest Len ft = 30000 0.00 0,00 0,00 Span in = 0.0 0.0 0.0 0.0 Crest El. ft = 8.20 0.00 0.00 0.00 No. Barrels = 1 0 0 0 Weir Coeff. = 3.33 0.00 0.00 0.00 Invert El. ft = 5.70 0,00 0.00 0.00 Eqn. Exp. = 1.50 0.00 0.00 0,00 Length ft = 40.0 0.0 0.0 0.0 Multi -Stage = No No No No Slope % = 0.00 0.00 0.00 0.00 N-Value = .013 .000 .000 .000 Orif. Coeff. = 0.60 0.00 0,00 0.00 Multi -Stage = ----- No No No Tailwater Elevation = 0,00 ft Stage / Storage / Discharge Table Note'. All ou0lows have been analyzed under Inlet and outlet control. Stage Storage Elevation Clv A Clv B Clv C Clv D Wr A Wr B Wr C Wr D Discharge ft tuft ft cfs cfs cfs cfs cfs cfs cfs cfs cfs 0.00 0 5.70 0.00 --- --- --- 0.00 --- --- --- 0.00 0.25 487 5.95 0.00 --- --- --- 0.00 --- --- --- 0.00 0.50 974 6.20 0.00 --- --- --- 0.00 --- --- --- 0.00 0.75 1,461 6.45 0.00 --- --- --- 0.00 --- --- --- 0.00 1.00 1,948 6.70 0.00 --- --- --- 0.00 --- --- --- 0.00 1.25 2,435 6.95 0.00 --- --- --- 0.00 --- --- --- 0.00 1.50 2,922 7.20 0.00 --- --- --- 0.00 --- --- --- 0.00 1.75 3,409 7.45 0.00 --- --- --- 0.00 --- --- --- 0.00 2.00 3,896 7.70 0.00 --- --- --- 0.00 --- --- --- 0.00 2.25 4,383 7.95 0.00 --- --- --- 0.00 --- --- --- 0.00 2.50 4,870 8.20 0.00 --- --- --- 0.00 --- --- --- 0.00 v,1V . KUV :FCC: REED October 12, 2000 Ms. Linda Lewis NCDENR 127 Cardinal Drive Extension Wilmington, NC 28405 RE: Ocean Isle West Destination Resort; Section 2, Phase 3 Islander Resort DWQ Stormwater Project # SW8 000638 Dear Linda: 01566-0007 (REST) (10) On behalf of our client, North Carolina Coastal Developments, Inc., I am writing in response to your comment letter to Mark Magrath, PE, dated September 21, 2000. We appreciate your comments and suggestions. As you know, Mark Magrath previously did the storm water design on this project. Based on workload at our firm, I have taken over to help him out. As you will see, the design is now by me. Since you last corresponded with Mark Magrath, the developer has required a reconfiguring of the parking layout. This affects the drainage area, as well as the impervious percentage. Also, we have added the overflow piping to the drainage system. Based on these changes, I have revised the drainage calculations previously completed by Mark Magrath. The calculations follow the same order and layout. The additions are a data spreadsheet and overflow calculations at the end. Below are our responses to the items you mentioned in the letter to Mark Magrath. The vegetative filter is now shown as 50 feet long on the detail sheet. Also, it is shown as 50 feet long on the plan. The application has been revised as requested. Agreeably, the bypass piping will aid in the lifespan of the infiltration system. The newly designed system accepts rainfall into 3 inlets. Overflow piping is provided in each of those three inlets at inverts equal or greater than the top of the trench (now 8.2 EL). The overflow pipes are routed in a separate alignment to a common storm drain manhole dedicated only for overflow, and then out to the grassed lined treatment Swale. As a side note, the swale has been moved to the east side of the building. There is more room for it there. The 10-year design storm does not totally fill the infiltration trench. Therefore, there is no overflow for the design storm. However, a combination of 8 and 10 inch High Density Polyethylene (HDPE) overflow pipes and storm drain manholes are shown for those storm events that will fill the trenches. Please see the plan. The overflow elevation is now 8.2 for the system. This is shown correctly on the plans and the supplement. 5:\015661 7Uub housoM-commU0.12-0 lltr to linda le is Eoc 243 N. FRONT ST., WILMINGTON, NORTH CAROLINA 28401 TEL 910.343.1048 FAX 910.251.8282 www.mckimcreed.com AA000]00] Ms. Linda Lewis October 12, 2000 Page 2 of 2 As always, we appreciate your review and comments. If you have any questions, please do not hesitate to call (910-343-1048). Sincerely, McKKIIM & CREED, P.A. Mark T. Arcuri Project Engineer fryer r/,17R cc: Steve Mann Herb McKim file 59015660007\club house\10-comm\10-12-00lftr to Ilntla lewis tloc v McKW & CREED * * * COMMUNICATION RESULT REPORT ( SEP.21.2000 12:43PM ) * * * P. 1 FILE MODE 229 MEMORY TX OPTION REASON FOR ERROR E-3) NONANSWERUP R LINE FAIL TTI NCDENR WIRO ADDRESS (GROUP) RESULT PAGE ------------------------------------------------------ 8-9192338031 E-2) BUSY E-4) NO FACSIMILE CONNECTION State of North Carolina Department of Environment and Natural Resources Division of Water Quality Wilmington Regional Office James B. Hunt, Governor FAX COVER SHEET Date: September 21, 2000 To: Mark McGrath, P.E. Company: McKim and Creed Engineers FAX #: 919-233.8031 Bill )dolman, Secretary No. of Pages: 2/J�/ From: Linda Lewis Water Quality Section - Stormwater FAX #: 910-350-2004 Phone #: 910-395-3900 DWQ Stormwater Project #SW8 000638 Project Name: Ocean Isle West Destination Resort, Phase II, Section 3 MESSAGE: The vegetated filter must be at least 50' long for SA waters. Please revise the level spreader detail on sheet 2, which currently shows only 30'. The agent authorization in Section'VH of the application is where the applicant writes in who the State will be dealing with regarding questions about the stormwater application on his/her behalf, The engineering firm's name and address is generally provided as the submittal agent. The application previously submitted on June 23, 2000, and returned to you, had McKim and Creed specified as the authorized agent. State of North Carolina Department of Environment and Natural Resources Division of Water Quality Wilmington Regional Office ,lames B. Hunt, Governor FAX COVER SHEET Date: September 21, 2000 To: Mark McGrath, P.E. Company: McKim and Creed Engineers FAX #: 919-233-8031 Bill Holman, Secretary No. of Pages: 2 From: Linda Lewis Water Quality Section - Stormwater FAX #: 910-350-2004 Phone #: 910-395-3900 DWQ Stormwater Project #SW8 000638 Project Name: Ocean Isle West Destination Resort, Phase II, Section 3 MESSAGE: The vegetated filter must be at least 50' long for SA waters. Please revise the level spreader detail on sheet 2, which currently shows only 30'. The agent authorization in Section V11 of the application is where the applicant writes in who the State will be dealing with regarding questions about the stonnwater application on his/her behalf. The engineering firm's name and address is generally provided as the submittal agent. The application previously submitted on ,tune 23, 2000, and returned to you, had McKim and Creed specified as the authorized agent. Thanks for clearing up the piping length vs. trench length confusion. The requirement to provide a bypass isn't a question of flood prevention. The point of'requiring that the system be offline is to provide a longer life for the infiltration system. By treating runoff that isn't required to be treated, the filter media becomes clogged sooner, shortening the useable life of the system and costing the owner more money due to the more frequent maintenance. The upfront cost of adding appropriate bypass piping is more than offset by the increased useable life of the system. As previously requested, please provide a bypass system that will truly make the system an offline system and bypass the excess design storm. The bottom of the trench is indicated as elevation 5.7 and the trench height is 2.25', which means the overflows should be set at 7.95, but the supplement and plans show an overflow at 7.85. Please revise and correct. S:\WQS\STORM WA7\ADDINPO\000638.SEP 127 Cardinal Drive Extension, Wilmington, NC 28405-3845 'Telephone (910) 395-3900 FAX (910) 350-2004 An Equal Opportunity Affirmative Action Employer OVERFLOW STRUCTURE GRATE ELEV. = 9.6 CATCH BASIN n/ie/ao DATE GROUT k W 1�Gy in o°°8 a 8°oeoe� �g oIo� 01 51 15" PERF. CORRUGATED ' POLYETHYLENE PIPE (HIGH DENSITY) #57 WASHED STONE �-1SUMP BELOW INVERTS OF PIPE OVERFLOW STRUCTURE AT END OF SYSTEM GRATE ELEVAPOI SEE GRADING & CATCH BASIN SUMP BELOW INVERTS TYPICAL SECTION INF9LTRAION SYSTE—h NOT TO SCALE �5625 Dillard Dr., Suite 117, Phone: (919)233-8091, Fa' Cary, North Carolina 27511 AA0002667 Internet Site: http: v,MCKIM&CREED TO: NCDENR Wilmington Regional Office 127 Cardinal Drive Extension Wilmington, NC 28401 ATTENTION: Ms. Linda Lewis LETTER OF TRANSMITTAL gust 18, 2000 01566-0002 E TASK NO'. REST RE: Ocean Isle West Destination Resort Section 2, Phase 3 Stormwater Mgmt. Plan Re -Submittal TRANSMITTAL NO PAGE OF WE ARE SENDING: ® Originals x Prints ❑ Shop Drawings ❑ Samples ❑ Specifications ® Calculations Quantity Drawing No. Rev. Description Status 1 original & 1 copy Revised Stormwater Management Permit Application Form SWU-101 F 1 copy Revised Underground Infiltration Trench Supplement Form SWU-107 F 2 copies Sealed 8/18/00 Revised Grading, Drainage & Erosion Control Plan & Detail Sheet F 2 copies Revised Infiltration Trench Calculations F 1 orig. Response letter to Linda Lewis dated 8/18/00 F 1 copy Revised Boring Map F DWQ Issue Status Code: A. Preliminary B. Fabrication Only C. For Information D. Bid E. Construction F. For Review & Comments G. For Approval H. See Remarks Action Status Code: 1. No Exceptions Taken 2. Make Corrections Noted 3. Other 4. Amend & Resubmit 5. Rejected - See Remarks REMARKS: Linda, Attached are the above referenced items per your comment letter dated 7/26/00. Per your letter I have only resubmitted necessary items that needed revisions. We look forward to hearing from you in the near future. Thank you. 5825 DILLARD DRIVE, SUITE 117, CARY, NO 27511 (919) 233-8091 FAX (919) 233-8031 cc: Steve Mann- North Carolina Coastal McKIM & CREED ENGINEERS, PA Developments, Inc. N�t�k N�,r�r�ti Signed Mark J Magrath, P.E. S115e510Do2I10-Comm\Tr821001 indalewis. doc v MCIQM&CREED v August 18, 2000 M&C 01566-0003(10) Ms. Linda Lewis NCDENR Wilmington Regional Office 127 Cardinal Drive Extension Wilmington, North Carolina 28401 RE: Ocean Isle West Destination Resort, Section 2, Phase 3 Stormwater Project No. SW8 000638 Dear Linda: AUG 2 4 2000 PROJ # 5(,c D'FCWC03g The following letter is in response to your comment letter dated July 26, 2000 for the above referenced site. Comment 1 A more detailed vicinity map is now indicated on the drawings. Comment 2 The drawings now reflect a flow spreader device at the flared end section just downstream of the overflow structure. The vegetated filter is downstream of the flow spreader. The grassed Swale stops well within 50' of the Mean High Water line. Comment 3 Dimensions on the proposed building, walks, parking spaces, drives, and pool deck area, etc. The pool deck area is timber treated wood decking. Comment 4 The boring map is now accurate with the existing site boundary. The two (2) boring locations are indicated on the map. The map is much clearer to read. Comment 5 The proposed underground infiltration system captures and infiltrates the runoff from the first 1.5 inches of rainfall. The peak storms are flushed through the system and outlet at the overflow structure en route to the flow spreader device. There are adequate amount of catch basins to support the peak runoff and the time of concentration is short so that the peak storms will flush through the system hence not flooding the system. Comment 6 Existing and proposed contours, as well as, spot elevations are added to the legend. Spot elevations are for T/P (Top of Pavement) and T/G (Top of Grade) for all pervious surfaces. 5625 DILLARD DR., SUITE 117, CARY, NORTH CAROLINA 27511 5\1566OW2\10-Commmmind.1~w W17Wtl T,LM9.233.8091 FAx919.233.8031 www.mcklmcreed.com AA0002667 Comment 7 There were already plenty of existing of spots and contour lines indicated on the plan. I did add more top of grade and top of pavement spots to the plan. The contour lines on the plan clearly indicate the directional flow of water towards the inlets. Comment 8 The roof drainage exits the building at the top right corner and enters the system at a proposed catch basin. Comment 9 A 1 foot in depth sump was added to the catch basins on the detail sheet to allow pretreatment. Comment 10 Observation well is not needed. Periodic inspection of the catch basins and sump cleanout will occur. Comment 11 Per the rules, all built upon areas on the project will be treated. The building rooftop has been added to the calculations and is labeled on the drawing as Ta_2. The pool deck is not covered and is slatted timber treated decking. Comment 12 The pipe length that is reflected in my calculations is representative of exactly how much piping is shown on my design. There is no pipe inside the catch basins hence an extra 2' on each side is not needed to be added or recalculated. The trench length is exactly the same length as the pipe length because there is no extra pipe in the catch basin structures. Comment 13 The volume calculation was readjusted to reflect accurate area of a 15" pipe. The revised calculations will reflect this change. The system provides more than adequate storage. I will remain optimistic that this is the final comment letter prior to an approval letter. Please call me if you have any questions or comments concerning this submittal. Thank you and I look forward to hearing from you in the near future. Very truly, Mc IM & CREED, P.A. U P. E. ark J. Jagrath, Project Engineer cc: Mark Arcuri, P.E. — MCE Enclosures S 11588W00P I0-G.m.klfthndalev.,i 081700. d. v�MCIQM&CREED , 3 OLP occo 8 9 �k;.�l•j5 OR / \/ 84 8 c14i ef �r mod/ y�� ✓ /--` , RECEIVED �< PBOJ # SW FOyo & 3 0 A ^H �UFKW&� BORING MAP M25 ORION Dr., ail. 117, RIAq. I Rnms (919)233-MI, F..: (919)23 W31 Cary North Carolina OCEAN ISLE WEST DESTINATION RESORT 1 State of North Carolina Department of Environment and Natural Resources Wilmington Regional Office James B. Hunt, Jr., Governor Bill Holman, Secretary Division of Water Quality July 26, 2000 Mr. Steve Mann, Vice President North Carolina Coastal Developments, Inc. 15 Causeway Drive Ocean Isle Beach, NC 28469-0750 Subject: ACKNOWLEDGMENT OF RECEIPT AND REQUEST FOR ADDITIONAL INFORMATION Stormwater Project No. SW8 000638 Ocean Isle West Destination Resort Sectopm 2, Phase 3 Brunswick County Dear Mr. Mann: The Wilmington Regional Office received a Stormwater Management Permit Application for Ocean Isle West Destination Resort Sectopm 2, Phase 3 on June 23, 2000. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: Please provide a more detailed vicinity map. Please add major roads, such as US 17 and the nearest major intersection, such as 179 and SR 1184. The vegetated filter and the grassed outlet Swale are two different things. Please refer to the enclosed vegetated filter detail. The filter is a flat grassed area with a flow spreader mechanism. Please detail accurately. Include all pertinent inverts and elevations, flow spreader mechanism, grass type to be planted, etc. Please do not construct an open ditch to surface waters. The grassed swale after the filter must stop at least 50' from Mean High Water, and the runoff must sheet flow into the waterway. Direct outlets to SA waters are prohibited. 3. Please provide dimensions for the buildings, walks, parking, drives, pool area, etc. Please label all wood deck areas and all concrete areas. 4. 1 cannot correlate the boring map provided with the site. It doesn't even look like the same site. 5. The rules require infiltration to be an offline system, which means that the excess design storm entering the system is diverted around the system before it gets into the system. The proposed design offers a bypass at one location; after the runoff is already in the system. Each inlet should have a bypass line set at the overflow elevation, which then directs the runoff to the vegetated filter. The bypass line can be designed to sit on top of the trench or outside the trench area, and bypass pipes from the other inlets can be connected to it. 6. Please add existing and proposed contours and spot elevations to the legend. Please add sufficient proposed spot elevations and contours to indicate how the runoff will be collected and directed into the system. Please show the roof drainage and how/where it connects into the system. 127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone 910-395-3900 FAX 910-350-2004 An Equal Opportunity Affirmative Action EmDloyer 50 % recycled/10"/,, post -consumer paver Mr. Mann July 26, 2000 Stormwater Project No. SW8 000638 9. A pretreatment device is required prior to entering the infiltration system. The grassed swale for the overflow is not pretreatment. For this type of collection system, it is best to specify that a sump be placed at the bottom of the catch basins. You can then specify the depth at which the catch basins will be cleaned out on the supplement form in the O & M area. 10. Regarding item "so on the supplement, the observation well requirement has more to do with keeping an eye on the water table than on silt buildup. For this project, an observation well will not be needed. 11. Please add the building, pool deck (if covered or concrete), and sidewalk impervious cover to the application, in the provided boxes. If the 71,438 currently shown does not include those areas, you will need to recalculate the volume and check the proposed trench for capacity. The rules require that the runoff from all built -upon area on the project be treated. 12. The trench length is less than the pipe length. The trench overlaps at the inlets by 2' on each side, therefore, those trenches will be 4' shorter than the pipe. 13. The volume in the pipe is calculated by simply finding the area of the pipe and multiplying by the length of pipe. My number comes up as 2,228 cubic feet, not 3,565. I calculate the area of a 15" pipe as 1.227 ftz. Please check and revise as needed. As proposed, the system does not provide enough storage. Please note that this request for additional information is in response to a preliminary review. The requested information should be received by this Office prior to August 26, 2000, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation ofNCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not acceptable. If you have any questions concerning this matter please feel free to call me at (910) 395-3900. Sincerely, Linda Lewis Environmental Engineer RSS/arl: S:\WQS\STORMWAT\ADDINFO\000638.JUL cc: Linda Lewis Mark Magrath, P.E. 127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone 910-395-3900 FAX 910-350-2004 An Equal Opportunity Affirmative Action Employer 50 % recycled/10°/ post -consumer paper JUN I TO: NCDENR LYr--1 Wilmington Regional Office 127 Cardinal Drive Extension Wilmington, NC 28401 ATTENTION: Ms. Linda Lewis WE ARE SENDING: ❑ Originals M Specifications t N/ LLETITER OF TRANSMITTAL D4 'UU0June18, 2000 P '„RQ_EUra 01566-0002 l• iOcean TASK No REST RE: Isle West Destination Resort Section 2, Phase 3 Stormwater Mangement Plan Submittal TRANSMITTAL NO: PAGE OF ❑x Prints ❑ Shop Drawings ❑ Samples ❑ Calculations ❑x Other - Narrative Quantity Drawing No. Rev. Description Status 1 original & 1 copy Stormwater Management Permit Application Form SWU-101 F 1 copy Underground Infiltration Trench Supplement Form SWU-107 F 2 copies Sealed 6/8/00 Design Narrative and Specifications F 2 copies Sealed 6/8/00 Grading, Drainage & Erosion Control Plan & Detail Sheet F 1 copy Existing CAMA Permit #154-98 F 1 $420.00 Check RECEIVED F Issue Status Code: A. Preliminary B. Fabrication Only C. For Information D. Bid E. Construction F. For Review & Comments G. For Approval H. See Remarks Action Status Code: 1. No Exceptions Taken 2. Make Corrections Noted 3. Other 4. Amend & Resubmit 5. Rejected - See Remarks REMARKS: Attached are the above referenced documents for you review. Please contact me if you have any comments. Thank you. -0 ( W TV R.' JUN 2 0 2000 DWQ PROJ # 5625 DILLARD DRIVE, SUITE 117, CARY, NC 27511 (919) 233-8091 FAX (919) 233-8031 cc: Steve Mann- North Carolina Coastal McKIM & CREED ENGINEERS, PA Developments, Inc. p KJEW- { Signed i NI I4Mark J. Magrath, P. . S-..\1566\0002\10-Comm\Tr608001indalewis,doc i Al Op" J%x 2522 906..g1on, AWA Viaw4w 28402 3el 910-452-0001 9�.w s.n. ye964. -4 �.V_7 61- May 18, 2000 Mark Arcuri, P.E. McKIM & CREED 243 N Front Street Wilmington, NC 28401 Reference: Soil evaluation for stormwater for the Ocean Isle West Resort. Dear Mr. Arcuri, Ade f4 .Ta.9'.h 3805 9(4A&K& jyronr<e %6nmy6n, M 28403 Earlier today, Land Management Group, Inc completed the soil characterization for stormwater infiltration at the nine locations that you had requested. The following is a report of my findings with respect to soil profile description, depth to seasonal high water table, and soil infiltration rate. In addition to these nine borings, Land Management Group, Inc. has performed extensive studies of this site with bore holes, pits, monitoring wells, and pump -out tests. I am enclosing a copy of that report dated September 22, 1998 for your review. Please do not hesitate to contact Craig Turner or myself if you have any questions about either today's report or the 1998 study. Sincerely, John P Williams, NC Licensed Soil Scientist License #1113 attachments RECEIVED JUN 2 3 2000 dCXXo38 PROJ # Ocean Isle West Resort Ocean Isle Beach, NC May 18, 2000 Bore hole locations as staked by Thompkins Land Surveying Bore Infilt. Estimated High Observed Hole 4 Description Rate Watertable Water BHI 04" Mixed fill, S/SCL, wood, 2.5Y4/2 —lin/hr 28" 42" 4-28" Sand, single grained, 2.5Y6/3 14-24 in/hr 28-36" Sand, single grained, 2.5Y6/2,7/3 14-24 in/hr 36-60" Sand, single grtained, 2.5Y6/2,7/2 14-24 in/hr 131-12 O-12" Clean Sand fill, 2.5Y6/4 14-24 in/hr 30" 44" 12-15" Sand, single grained, 2.5Y4/2 14-24 in/hr 15-30" Sand, single grained, 2.5Y6/3 14-24 in/hr 30-42" Sand, single grained, 2.5Y5/2,6/2 14-24 in/hr 42-60" Sand, single grained, 2.5Y7/1,6/8 14-24 in/hr BH3 0-6" Clean Sand fill, 2.5Y4/2 14-24 in/hr 24" 32" 6-24" Clean Sand fill, 2.5Y6/4 14-24 iMir 24-36" Clean Sand Fill, N5/1 14-24 in/hr 36-40" Decomposed marsh mat w/S, 5GY5/1 14-24 in/hr 40-60" Sand, single grained, IOGYS/1 14-24 in/hr BH4 0-32" Clean Sand fill, 2.5Y6/3 14-24 in/hr 32" 43" 32-42" Clean Sand fill, 2.5Y6/2 14-24 in/hr 42-48" Sand/Loamy Sand, 5GY6/1 14-24 4Vhr 48-60" Sand/ LS, single grained, I OGY6/1 14-24 in/hr BH5 0-28" Clean Sand fill, 2.5Y6/3,6/4 14-24 in/hr 28" 40" 28-36" Clean Sand fill, 2.5Y6/3,6/2 14-24 in/hr 36-40" Decomposed marsh mat w/S, 5GY6/1 14-24 in/hr 40-60" Sand, single grained, 10GY6/1 14-24 in/hr 131-16 0-10" Clean Sand fill, 2.5Y6/3,6/2 14-24 in/hr 10" 24" 10-24" Decomposed marsh mat w/LS, 5GY5/1 14-24 in/hr 24-60" S/LS, few roots, single grained, 1 OGY5/1 14-24 in/hr BH7 0-18" Clean Sand fill, 2.5Y6/3 14-24 in/hr 18-24" Clean Sand fill, N5/1 14-24 in/hr 24-30" Decomposed marsh mat w/LS, 5GY5/1 14-24 in/hr 30-60" Sand, single grained, IOGYS/1 14-24 in/hr I Ocean Isle West Resort Ocean Isle Beach, NC May 18, 2000 Bore hole locations as staked by Thompkins Land Surveying. Bore Infilt. Estimated High Observed Hole # Description Rate Watertable Water BH8 0-12" Sandy clay loam fill, 10YR6/4 —0.6 to in/hr 58" None 12-18" SCL/ CL fill, IOYR6/1,6/4 —0.6 to in/hr 18-58" Sand, single grained, 2.5Y6/3.6/2 14-24 in/hr 58-60" Sand, single grained, 2.5Y6/2,6/1 14-24 in/hr BH9 0-2" Sandy clay loam fill, 10YR6/6 —0.6 to 1 in/hr 54" None 2-54" Sand, single grained, 2.5Y6/3.6/2 14-24 in/hr 54-60" Sand, single grained, 2.5Y6/2,6/1 14-24 in/hr SOIL 7 Sent By: LAND MANAGEMENT; 910 452 0060; May-19-00 8:52AM; Page 2/2 Erosion and Sedimentation Control 1.01 General: The contractor shall be responsible for erosion and sedimentation control within the construction limits; for prevention of sediment laden runoff leaving the construction limits or entering ditches, streams or water impoundment's; and for implementation of necessary erosion and sedimentation control measures to meet the requirements of the North Carolina Department of Environment, Health, and Natural Resources. The Contractor shall also be responsible for all damages or fines resulting from erosion or sediment laden runoff in the execution of his contract. 1.02 Construction Sequence: While the use of erosion and sedimentation control devices is especially important on areas of steep topography, easily erodible soils and sites in close proximity to water courses throughout the construction period, the control measures should be installed prior to the commencement of land clearing and shall be fully maintained and periodically inspected until final restoration and stabilization is completed. Unrestored cleared areas shall be kept to a minimum. Disturbed areas ahead of construction shall only be accomplished on those segments for the shortest practical distance as required for continual progress. Final restoration shall not be delayed until completion of the project but will be carried out in phases as the work proceeds. Under no circumstances will any areas be left denuded for more than (30) thirty calendar days without some form of stabilization until final restoration is complete. 1.03 Sedimentation: Control Measures: The following are some of the sediment control devices or measures that may be required to prevent sedimentation of streams, water courses, or drainage structures: 1. Sediment filter inlets 2. Silt fences 3. Temporary gravel construction entrance 1.03.1 Erosion Control Measures: Some of the soil erosion control measures which may be required in this contract are: I. . Storm inlet protection 2. Silt fences 3. Temporary gravel construction entrance RECEIL �D JUN 2 3 2000 PROJ # 6 H CARO Q�OFESS/oyes , 480 3 �� �. MN \� t° 1.03.2 Detail Drawing: Examples of sedimentation and erosion control details are shown in these plans for installation at locations designated in the plans or as otherwise required by the regulating agency, or the owner as work proceeds. 1.04 Construction Access: The travel of equipment to and from the construction areas shall be minimized not only to protect areas that will not be denuded, but also to prevent the spreading of sediment within and outside of the construction areas. Therefore, special construction equipment travel corridors will be established for this use and instructions shall be issued for their use. Use of these corridors must be fully enforced. Other non- essential traffic will be restricted or discouraged. Indiscriminate and convenience traffic shall not be allowed. 1.05 StockpileBorrow Areas: The Contractor shall be responsible for selecting, obtaining and maintaining stockpile or borrow areas which he may require to complete the contract. He is also required to design and incorporate all necessary sediment and erosion controls measures necessary to prevent erosion and contribution of sediment to adjacent areas. The Contractor is responsible to obtain all necessary permits or approvals for borrow or spoil areas outside the construction limits. 1.06 Disposal of Excess Water From Excavations: The Contractor shall practice management of excess water pumped from excavation to reduce the production and spreading of sediment. Pumped water shall be discharged onto stabilized surfaces and allowed to filter through either sediment traps, filter inlets, gravel filters, or other additional control measures as may be necessary. If ditches are required to remove pumped water from construction excavations, they shall be given the same consideration as any other man- made waterway and they shall be stabilized as to not degrade and produce sediment. 1.07 Excavation and Backfill: Excavation shall be closely controlled and all the material removed from the excavation shall be selectively stockpiled in areas where a minimum of sediment will be generated and where other damage will not result from the piled material. Drainage ways shall be protected at all times and the placement of material in Drainage ways for convenience shall not be allowed. Backfilling operations shall be performed in such a manner that remaining trees are not damaged. 1.08 Final Grading: Finish grading, and installation of the permanent erosion control surfaces shall be performed after the construction phase is complete. In any case, sediment and erosion controls shall be installed promptly and their maintenance assured. 1.09 Approval: The approved Erosion Control Plan will be provided by the Owner. Any standard conditions relating to soil erosion and sediment control issued to the Contractor as a part of any permits shall be available at the job site at all times. DECRROL WILLIAMSON ENTERPRISES FAX NO. : 91057577t30 Apr. 04 2000 10:24AM P2 ..t i � • :l n ®ER gym.. w.• S. JA M" SMr1NTJR..,; , . t P;;QOKRNOR p1. 1•^; NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES 131VISION OF COASTAL MANAGEMENT December 9, 1998 Ocean isle West Resort IS Causeway Drive Ocean Isle Beach, NC 28469 Dear Sir Tbccnck*ed pemmk mastinuesauthor2ati® nndcrihe Coa&WAreaMw4cmentAc; and where applicable, the State Dredge and F171 Law, for you to proceed with yota'projedproposal. The original (buff -colored form) is retained by you and it must be available on aim when the pmject is inspected for compliance• Please sign both the original and the copy and return the copy to this o$loe in the enclosed envelope. Signing the permit and proceeding means you have waived your right of appeal deacn-bed below. Ifyon object to *Op=lkcr any Ofdm con h&= youmgytequeg a hearab porsu= W NCGS 113A-121.1 or 113-229. Your petition for a hearing must be filed in accordance with NCGS Chapter 150D with the Office of AdministmtivcHcatings, P.O. Draws 116", Ralelgh,NC 27611, (919) 733 2698 within twenty (20) days ofdnis decision on your permit You should also be aware that if another qualified party submits a valid objection to the issuance ofthis permit within twenty (20) days, the matter must be resolved prior to work initiation. The Coastal Resources Commission makes the final decision on any appeal. The project plan is subjeetm those conditions appearing on the permit form, Orherwise� all work must be carried out in accedence with your application. Modifications, time extensions, and finure maintenance require additional approval. Please read yoir permit carefully prior to starting work and review all project plans, as approved, If you are having the work done by a connector, it would be to your benefit to be sure That he dilly understands all permit requirements. Prom time to time, Department pemsotwel will visit the project site. To facilitate this review, we request that you complete and mail the enclosed Notice Card just prior to work initiation. However, if questions arise conceming permit oonditicas, envconueanml safegttmdt, or problem areas, you may contact Departmentpeisormel ar any rime for assistance. By working is accordance with the pemnit,.you will be helping to protect our vitally important coastal resources, Very sincerely, 7ohn R. Parker, Yr. Major Permits Processing Coordinator mnjf/amw Enclosure RO- DeA 216d'l, RI1Lr.a•b Fe •27011.10Or /=!}6 C�PIT�4 ■L�On Rw�ClO N, NC aYCW n'+MONE a1 p•7a3-229a FAY p7 e•raa-t asg AN SRUAL O►PORTOM>Y MFPIRNATrvG ACTION (:N�40YCR • a0% RGCYCLaD/1 OR POGrKONOH NCR MPaq rKUM MurIMCREEDWILMINGTON 9102546682 P. 3 DECAROL WILLIAMSON ENTERPRISES FAX NO. : 9105757780 Apr. 04 2000 10:25AM P3 pemtit Clara Permit Nutnber NEVV 154-98 STATE OF NORTH CAROI-INA Department of Environment and Natural Resources and �oastal Resources Commission 3pErmit % for Major Development in an Area of Environmental Concern pursuant to NCOS 113A-118 Excavation and/or fillingpursaant to NCGS 113-229 Issued to Ocean Isle West Resort, 15 Causeway Drive, Ocean Isle Reach, NC 28469 authorizing development in Brunswick Count, at Atlantic Ocean and Old Sound Creek, western end of Ocean Isle Beach . as requested in the permittea's applicarton dated 325/98 including attached workplan drawings described in Condition No. 1, below, and AEC Hazard Notice dated 325/98. This permit, issued on \ d- —X -- C\J� , is subject to compliance with the application (where consistem with the pennit), all applicable regulations, special conditions and notes set forth below. Any violation of these terns may be subject to a fine. imprisonment or civil action; or may cattle the permit to be mull and void. 1) The project will be carried out in strict adherence to the following workplans, unless altered herein: Sheets 1 and 7 dated 1/6/98, Sheets 5, SA-51., 6, 8, 9, and 11, all dated March IM, 4 townhouse floor plans, all dated 3/20/98 and 3 duplex unit floor plans, all dated 320/98. Ocean Front Development 2) Prior to the initiation of construction within the Ocean Hazard AEC, a representative; of the Division of Coastal Managancnt must stake the limits of the 60 foot small structure development setback, the 120 foot large structure setback, and the landward limits of the fi=tal dime. Construction must begin within 30 days of these determinations. Fail= to initiate construction within 30 days, or erosion of the shoreline by adverse weather conditions, will require these limits to be restaked by the Division. (See attached sheets for Additional Conditions) This permit action may be appealed by the permiatee or. other qualified persons within twcary (20) days of the issuing date. An appeal requires resolution prior to work initiation Pr continuance, as i2te case may be. This permit must be accessible on -site to Depm=mt personnel when the project is inspected for compliance_ Any maintenance work or project modification not covered hereunder requires further13tpartmPr*ar approval. All work must cease when the permit expires on Deceraher 31, 2001 In issuing this permit, the State of North Carolina agrees that your project is consistent with the North Cstoliva Coastal Management Program. Signed by the authority of the Secretary of DENR and the Chairman ofthe Coastal Resources Commission. onna JVAoffirt,Director D isionofCoastalManagement This rrs can i ru are hereby accepted. Signature of Permitice