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HomeMy WebLinkAboutSW8990913_HISTORICAL FILE_20080402 STORMWATER DIVISION CODING SHEET POST-CONSTRUCTION PERMITS PERMIT NO. SW8 c�°►o R13 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE Zo o Sf O'-t o 2 YYYYMMDD W A7F'q Michael P.Easley,Governor William G.Ross Jr,Secre ary ,0), r North Carolina Department ol'Environment and Natural Resources 'C Coleen H.Sullins Director Division of Water Quality April 2, 2008 Mark Saunders, President Coastal Communities, Inc. 131 Ocean Blvd. West Holden Beach, NC 28462 Subject: State Stormwater Permit No. SW8 990913 Modification SeaScape at Holden Plantation Overall Low Density Residential Subdivision with Pockets of High Density Brunswick County Dear Mr. Saunders: The Wilmington Regional Office received a complete Stormwater Management Permit Application for SeaScape at Holden Plantation on January 16, 2008. 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. SW8 990913 Modification, dated April 2, 2008, for the construction of the subject project. This permit shall be effective from the date of issuance until April 2, 2018, 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. Prior to the development of any future area or additional phase noted on the approved plans, a permit modification must be submitted to and approved by the Division. The modification must demonstrate that the built- upon area does not exceed the maximum amount permitted under this permit and that it meets the intent of low density development per the stormwater rules and available guidance. 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 sixty (60) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150E of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final 1and binding. If you have any questions, or need additional information concerning this matter, please contact Rhonda Hall, or me at (910) 6-7215. Sinc y, E eck _ Regional Supervisor Surface Water Protection Section ENB/rbh: S:\WQS\STORMWATER\PERMIT1990913MOD.apro8 cc: Davis Fennell, Cape Fear Engineering, Inc. Brunswick County Inspections Jeff Phillips, Brunswick County Engineering Rhonda Hall Wilmington Regional Office) fire Central Files No�thCatolina Al ?trrrally North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington,NC 28405 Phone(910)796-7215 Customer Service Wilmington Regional Office Intcmel: wenvnewaterguality.org Fax (910)350-2004 1-877-623-6748 An Equal Opportunity/Affirmative Action Employer—50%Recycled/10%Post Consumer Paper it State Stormwater Management Systems Permit No. SW8 990913 Modification STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT OVERALL LOW DENSITY SUBDIVISION DEVELOPMENT WITH POCKETS OF HIGH DENSITY 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 Mark Saunders and Coastal Communities, Inc. SeaScape at Holden Plantation Stone Chimney Road (SR 1119), Holden Beach, Brunswick County FOR THE construction, operation and maintenance of a 25% low density subdivision with a curb outlet swale system, three infiltration trenches, an one infiltration basin in compliance with the provisions of Title 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 April 2, 2018 and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. The overall tract built-upon area percentage for the project must be maintained at 25% per the requirements of Section .1005 of the stormwater rules. This project is permitted for a maximum of 5,343,849 square feet of BUA. 3. Prior to the development of any future area or additional phase noted on the approved plans, a permit modification must be submitted to and approved by the Division. The modification must demonstrate that the built-upon area does not exceed the maximum amount permitted under this permit and that it meets the intent of low density development per the stormwater rules and available guidance. 4. The stormwater systems proposed to treat the runoff generated by the designated high density areas have been approved for the management of stormwater runoff as described in Section 1.10 on page 3 and Section 1.11 on page 4 of this permit. Page 2 of 10 r State Stormwater Management Systems Permit No. SW8 990913 Modification 5. The subdivision is permitted for 550 lots, each limited to that maximum amount of built-upon area as indicated in Section 11.24 (f) of this permit. 6. The low density portions of this project will maintain a minimum 30 foot wide vegetated buffer between all impervious areas and surface waters. 7. Within the low density portions of the permitted project, a curb outlet system is proposed. Each designated curb outlet swale or 100' vegetated area shown on the approved plan must be maintained at a minimum of 100' long, maintain 5:1 (H:V) side slopes or flatter, have a longitudinal slope no steeper than 5%, carry the flow from a 10 year storm in a non-erosive manner, maintain a dense vegetated cover, and be located in either a dedicated common area or a recorded drainage easement. 8. No piping shall be allowed except those minimum amounts necessary to direct runoff beneath an impervious surface such as a road or under driveways to provide access to lots. 9. Runoff conveyances other than the curb outlet system swales, such as perimeter ditches, must be vegetated with side slopes no steeper than 3:1 (H:V). 10. The following design elements have been permitted for the three infiltration trenches associated with this stormwater facility, and must be provided in the system at all times. Trench A Trench B Trench C a. Drainage Area, acres: 0.38 0.97 0.72 Onsite, ftZ: 16,553 42,253 31,300 Offsite, ftZ: None None None b. Total Impervious Surfaces, ftZ: 10,890 29,621 20,725 C. Design Storm, inches: 1.5 1.5 3 d. Trench Dimensions, L x W x H, ft: 165x6x3 415x6x3 96x24.5x4 e. Perforated Pipe Diameter/Length: 27165' 27415' 2.5'/480' f. Bottom Elevation, FMSL: 11 8 13 g. Bypass Weir Elevation, FMSL: 14 11 17 h. Permitted Storage Volume, ft3: 1,499 3,770 5,177 i. Type of Soil: Wando Sand Wando Sand Wando Sand j. Expected Infiltration Rate, in/hr: 5 9 11 k. Seasonal High Water Table, FMSL: 8.25 6 9.73 I. Time to Draw Down, hours: 3.22 1.93 2.34 m. Receiving Stream/River Basin: Intracoastal Waterway n. Stream Index Number: 15-25 0. Classification of Water Body: SA; HQW Page 3 of 10 r State Stormwater Management Systems Permit No. SW8 990913 Modification 11. The following design elements have been permitted for the infiltration basin associated with this stormwater facility, and must be provided in the system at all times. a. Drainage Area, acres: 1.59 Onsite, ftz: 69,159 Offsite, ftz: None b. Total Impervious Surfaces, ftz: 46,629 c. Basin Depth, feet: 3 d. Design Storm: 3" e. Bottom Elevation, FMSL: 13.0 f Permitted Surface Area @Bottom, ftz: 2,550 g Permitted Storage Volume, ft3: 14,121 h. Storage/Bypass Elevation, FMSL: 16.0 i Type of Soil: Waqndo Sands j. Expected Infiltration Rate, in/hr: 9 k. Time to Draw Down, hours: 12 I. Receiving Stream / River Basin: Intracoastal Waterway / Lumber m. Stream Index Number: 15-25 n. Classification of Water Body: "SA; HQW" 12. Level spreaders shall be provided at the ends of all swales that discharges into regulated wetlands and surface waters such that a sheet flow condition is created. Additional passive measures may be required for projects within '/z mile of SA waters. II. SCHEDULE OF COMPLIANCE 1. No homeowner/lot owner/developer shall fill in, alter, or pipe any drainage feature (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the permit and receiving approval from the Division. 2. The permittee is responsible for verifying that the proposed built-upon area for the entire lot does not exceed the maximum allowed by this permit. Once the lot transfer is complete, the built-upon area may not be revised without approval from the Division of Water Quality, and responsibility for meeting the built-upon area limit is transferred to the individual property owner. 3. If an Architectural Review Board or Committee is required to review plans for compliance with the BUA limit, the plans reviewed must include all proposed built-upon area. Any approvals given by the Board do not relieve the homeowner of the responsibility to maintain compliance with the permitted BUA limit. 4. 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. 5. Approved plans and specifications for projects covered by this permit are incorporated by reference and are enforceable parts of the permit. 6. Deed restrictions are incorporated into this permit by reference and must be recorded with the Office of the Register of Deeds prior to the sale of any lot. Page 4 of 10 State Stormwater Management Systems Permit No. SW8 990913 Modification 7. 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. 8. The runoff from all built-upon area within the drainage area of the pocket of high density permitted stormwater system must be directed into the permitted stormwater control system. 9. The Infiltration trenches 1 and 2 associated with the permitted stormwater system must be operated with a 50' vegetated filter strip. 10. Within the low density portions of the permitted project, all roof drains shall terminate at least 30 feet from the mean high water mark of surface waters. 11. The permittee shall submit all information requested by the Director or his representative within the time frame specified in the written information request. 12. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws, rules, and regulations contained in Title 15A of the North Carolina Administrative Code, Subchapter 2H.1000; and North Carolina General Statute 143-215.1 et. al. 13. 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 the approved plans, regardless of size. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built-upon area. e. Further subdivision, acquisition, 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. 14. The Director may determine that other revisions to the project should require a modification to the permit. 15. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project must be recorded showing all such required easements, in accordance with the approved plans. 16. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 17. 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. Page 5 of 10 State Stormwater Management Systems Permit No. SW8 990913 Modification 18. 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. 19. Unless otherwise shown, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 20. This permit shall become void unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 21. The permittee shall at all times provide the operation and maintenance necessary to assure that all components of the permitted stormwater system function 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. G. Mowing and re-vegetation of side slopes. d. Immediate repair of eroded areas. e. Maintenance of side slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of structures, orifice, catch basins and piping. g. Access to all components of the system must be available at all times. 22. Records of maintenance activities must be kept by the permittee. The records will indicate the date, activity, name of person performing the work and what actions were taken. 23. Prior to transfer of the permit, the stormwater facilities will be inspected by DWQ personnel. The facility must be in compliance with all permit conditions. Any items not in compliance must be repaired or replaced to design condition prior to the transfer. Records of maintenance activities performed to date will be required. 24. Prior to the sale of any lot, the following deed restrictions must be recorded: a. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number SW8 990913, as issued by the Division of Water Quality under NCAC 2H.1000. b. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the Stormwater Management Permit. C. These covenants are to run with the land and be binding on all persons and parties claiming under them. d. The covenants pertaining to stormwater may not be altered or rescinded without the express written consent of the State of North Carolina, Division of Water Quality. e. Alteration of the drainage as shown on the approved plans may not take place without the concurrence of the Division of Water Quality. Page 6 of 10 ,1 • State Stormwater Management Systems Permit No. SW8 990913 Modification f. The maximum built-upon area per lot is outlined in Atachment "A" and must be maintained for all lots to keep the overall low density classification for this development. This allotted amount includes any built-upon area constructed within the lot property boundaries, and that portion of the right-of-way between the front lot line and the edge of the pavement. Built upon area includes, but is not limited to, structures, asphalt, concrete, gravel, brick, stone, slate, coquina and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools. g. Filling in, piping or altering any designated 5:1 curb outlet swale or vegetated area associated with the development is prohibited by any persons. h. Filling in, piping or altering any 3:1 vegetated conveyances (ditches, swales, etc.) associated with the development except for average driveway crossings, is prohibited by any persons. i. A 30' vegetated buffer must be maintained between all built-upon area and the Mean High Water line of surface waters. j. All roof drains shall terminate at least 30' from the Mean High Water mark. k. Each designated curb outlet swale or 100' vegetated area shown on the approved plan must be maintained at a minimum of 100' long, maintain 5:1 (H:V) side slopes or flatter, have a longitudinal slope no steeper than 5%, carry the flow from a 10 year storm in a non-erosive manner, maintain a dense vegetated cover, and be located in either a dedicated common area or a recorded drainage easement. I. For those lots within CAMA's Area of Environmental Concern, where DCM calculates a different maximum lot built-upon area, the governing lot BUA shall be the most restrictive of the two amounts. M. Built-upon area in excess of the permitted amount will require a permit modification. 25. A copy of the recorded deed restrictions must be submitted to the Division within 30 days of the date of recording the plat, and prior to selling lots. The recorded copy must contain all of the statements above, the signature of the Permittee, the deed book number and page, and the stamp/signature of the Register of Deeds. III. GENERAL CONDITIONS 1. This permit is not transferable to any person or entity except after notice to and. approval by the Director. In the event there is either a desire for the facilities to change ownership, or there is a name change of the Permittee, a completed "Name/Ownership Change Form" must be submitted to the Division of Water Quality, signed by the parties involved, along with the applicable documents as listed on page 2 of the form. The project must be in good standing with DWQ. The approval of this request will be considered on its merits and may or may not be approved. 2. The permittee is responsible for compliance with all of the terms and conditions of this permit until such time as the Director approves the transfer request. Page 7 of 10 . ' State Stormwater Management Systems Permit No. SW8 990913 Modification 3. 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. 4. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal), which have jurisdiction. 5. 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. 6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and re-issuance or termination does not stay any permit condition. 7. Permittee grants permission to staff of the DWQ to access the property for the purposes of inspecting the stormwater facilities during normal business hours. 8. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 9. The permittee shall notify the Division in writing of any name, ownership or mailing address changes at least 30 days prior to making such changes. 10. A copy of the approved plans and specifications shall be maintained on file by the Permittee at all times. Permit issued this the 2nd day of April, 2008. NORTH IC OLINA ENVIRONMENTAL MANAGEMENT COMMISSION 11341 � for Coleen H. Sullins, Director Division of Water Quality By Authority of the Environmental Management Commission Page 8 of 10 OI'FICF USG ONLY O ©. . State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORNI This.loon may be photocopied for use as an original I. GENERAL INFORMATION: I. Applicant's name(specify the name of the corporation, individual, etc. who owns the project): Coastal Communities, Inc. 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Bobby Lewis 3. Mailing Address for person listed in item 2 above: 13 1 Ocean Blvd. West City: Holden Beach State: NC Zip: 284G2 Telephone Number: (910) 842-4939 4. Project Name (subdivision, facility, or establishment name- should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): 5ea5cape at Holden Plantation 5. Location of Project (street address): Stone Chimney Road (SR I 1 1 9) City: Holden Beach County: Brunswick 6. Directions to project (from nearest major intersection): Approx. 3/4 of a mile south of the Sabbath Home road and Stone Chimney road intersection across from the Entrance to the Lockwood Folly Golf Course Community 7. Latitude: N 33003'48" Longitude: W G I °34'4 1 '" Of project 3. Contact person who can answer questions about the project: Name: Sean Scanlon Telephone Number: (9 1 0) 842-4939 H. PERMIT INFORMATION: I. Specify whether project is (check one): New Renewal X Modification 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number 5W8 9909 1 3-Mod And its issue date (if known) 23 April 2001 Form: SWU-101 Version 3.99 Paec I of 4 3. Specify the type of project(check one): X Low Density High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): X 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 1-877-623-6747. III. PROJECT INFORNIATION 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. 5tormwater will be conveyed to 5: 1 vegetative 5wale5 at a minimum len6jth of 1 00' Erior to d15charclinc) Into wetland areas, amenity ponds and the proposed marina Site. 2. Stormwater runoff from this project drains to the Lumber River basin. 3. Total Project Area: 501 .57 acres 4. Project Built Upon Area: 24.46 % 5. How many drainage basins does the project have? 4 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Basin Information OVERALL Drainage Area 2 Receiving Stream Name Atlantic Intracoastal Waterway Receiving Stream Class 5A Drainage Basin Area 490.76 ac. (2 1 ,377,50G 5f) Existing Impervious* Area 0 Proposed Impervious* Area 122.67ac.(5,343,849 50 % Impervious* Area(total) 24.996 Impervious* Surface Area OVERALL Drainage Area 2 On-site Buildings 78.75 ac. (3,430,255) 5f) On-site Streets 30.57 ac. ( 1 ,33 1 ,G25) 5f) '2,000 5F/L0T allocated to 24 On-site Parking 2.05 ac. (50,G05 5f) lot5 for extra Ion6j drweway5 - On-site Sidewalks 8.45 ac. (369,389 5f) see pian for lot numbers Other on-site (Future) 2.50 ac. ( 1 2 1 .96(5 5f) and location Off site 0 Total: 122.67ac.(5,343,849 5f) Total: Impervious area is defined as the built upon area including, but not limited to, buildings, roads,parking areas, sidewalks. gravel areas, etc. 7. How was the off-site impervious area listed above derived? Topographic informacion Form: SNVU-101 Version 3.99 Pa,e 2 of 4 6. Complete the following information for each drainage basin. If there are more than two drainage basins in the project, attach an additional sheet with the information for each basin provided in the same format as below. Basin Information 1 2 Receiving Stream Name Atlantic Intracoastal Waterway Atlantic Intracoastal Waterway Receiving Stream Class 5A 5A Drainage Basin Area 165535E 42253 5F Existing Impervious* Area 0 0 Proposed Impervious* Area 10890 SF 2962 I SF % Impervious* Area(total) 65.79 70. 10 Impervious* Surface Area 1 2 On-site Buildings 0 0 On-site Streets 0 0 On-site Parking 0850 SF 2962 15F On-site Sidewalks 0 0 Other on-site 0 0 Off site 0 0 Total: E= 10890 SF E= 292G I SF Basin Information 3 4 Receiving Stream Name Atlantic Intracoastal Waterway Atlantic Intracoastal Waterway Receiving Stream Class SA 5A Drainage Basin Area 3 13005F 691 595E Existing Impervious* Area 0 0 Proposed Impervious* Area 20725 5F 46629 SF % Impervious* Area(total) 66.2 I 67.43 Impervious* Surface Area 3 4 On-site Buildings 4200 5F 12899 5F On-site Streets 0 0 On-site Parking I G525 5F 33730 5F On-site Sidewalks 0 0 Other on-site 0 0 Off site 0 0 Total: E= 20725 5F F= 46629 SF Basin Information Drainage Basin I Drainage Basin 2 Receiving Stream Name Receiving Stream Class Drainage Basin Area Existing Impervious* Area Proposed Impervious* Area %Impervious* Area(total) Impervious* Surface Area Drainage Basin I Drainage Basin 2 On-site Buildings On-site Streets On-site Parking On-site Sidewalks Other on-site Off site Total: E_ IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot number, size and the allowable built-upon area for each lot must be provided as an attachment. 1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. 2. No more than square feet of any lot shall be covered by structures or impervious materials. Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood Decking or the water surface ofswimming pools. "5EE ATTACHED DEED RESTRICTIONS 3. Swales shall not be filled in,piped, or altered except as necessary to provide driveway crossings. 4. Built-upon area in excess area of the permitted amount requires a state stormwater management permit modification prior to construction. 5. All permitted runofffrom 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 required covenants will be binding on all parties and persons claiming under them,that they will run 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-102 Infiltration Basin Supplement Form SWU-102 Low Density Supplement Form SWU-102 Curb Outlet System Supplement Form SWU-IO2 Off-Site System Supplement Form SWU-102 Underground Infiltration Trench Supplement Form SWU-102 Neuse River Basin Supplement Form SWU-102 innovative Best Management Practice Supplement Form: SWU-101 Version3.99 Page 3of4 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. • Original and one copy of the Stormwater Management Permit Application Form • One copy of the applicable Supplement Form(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 and 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 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 or firm): Cape Fear Engineerinq Mailing Address: 15 1 Poole Road, 5uite 100 City: Belville State: NC Zip: 28451 Phone: (9 1 0) 383- 1 044 Fax: (9 1 0) 383- 1045 Vill. APPLICANT'S CERTIFICATION 1, (print or type name ofperson listed on General Information, item 2) Bobby Lewis certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC 21-1 .1000. Signat Date: � yG�07 Form: SWU-101 Version 3.99 Page 4 of CAPE FEAR y!j Engineering, Inc. 151 Poole Road,Suite 100 1 BeNille,NC 88451 TEL (970)363-7044 ` FAX(910)383-1045 I w1vw.capefearengineefing.com Transmittal To: INCIDENR Date: 9/28/07 � ' f 127 Cardinal Drive Extension File: 801-23 Wilmington, NC 28405 Subject: SeaScape at Holden Plantation Stormwater Application for Attn: Jo Casmer SW8990913 Modification ❑ As Requested ❑ For Your Files ❑ For Distribution ❑ For your Review/Action/Approval ❑ Sent via Mail ❑ Sent via Courier Quantity Drawing No. Description 1 Check $505.00 Stormwater submittal fee REMARKS Please add to the application package you received on 9/12/07. Sorry for the inconvenience. CC: Cape Fear Engineering, Inc. Signed: a RECEIVED Maria Jones V Davis Fennell SEP 2 8 2007 Received By: By:— Date: Transmittal replacement check SW.doc l CAPE FEAR �n Engineering, Inc. 751 Poole Road,Sude 100 BoMile,NC 28457 TEL (910)383-1044 FAX (910)383-1045 www.capefearengineering.com Transmittal To: JNCDENR Date: 09/12/07 File: 801-23 Subject: SeaScape at Holden Plantation Attn: Rhonda Hall ❑ As Requested ❑ For Your Files ❑ For Distribution ❑ For your Review/Action /Approval ❑ Sent via Mail ❑ Sent via Courier Quantity Drawing No. Description 2 Original + 1 copy of Updated Application and Supplements 1 Updated Calculations 2 Updated Stormwater Management Plans REMARKS Thank you for the opportunity to review this pending file. I have removed the information that needed to be changed, replaced the appropriate pages of the plans and documents, and put the package back together for you, so when you review you will not have to make any of the changes yourself. CC: Cape ar En fneering, Inc. Signed a Davis Fen ell SEP 1 2 2007 Trans-rhonda-12sept07.doc Seascape at Holden Plantation Sample Calculations AOS #IA) Corresponding with Curb Outlet Supplement SWU-105. C (Column "4') C = Composite rational runoff coefficient = (Impervious area (Column "2) * 0.95 + Pervious area (Column "3') * 0.15)/Drainage area (Column "I ') = 0.51 The Flowrate was calculated using the following Intensity equation: Ijo (Column "6) (Brunswick County IDF) 121.796 Ito = Rainfall intensity(in/hr) = = 6.31 in./hr (T, +23.5)0843 Tc (Column "5') = Time of concentration (min) Tc = 10 min. if drainage area > 4 acres Otherwise Tc=20 min. and Ito=5.06 in./hr. Q (Column "7) Q = Flowrate (cfs) = C(Column "4') *I(Column "6') *A (Column "I') = 0.51 * 6.31 in/hr * 1.88ac = 6.01 cfs The depth of flow was calculated by reworking the following equations: Depth (Column "I] ') Depth (ft) =y Use mannings equation to solve for y: 0= La9 A* R�1' *SY2 = 6.01 cfs n Stormwater Calculations Seascape at Holden Plantation n = Mannings roughness coefficient = 0.03 A = Cross sectional area offlow (sfi _ (Bottom width *Depth) + (Side slope ratio Depth) = 0+5y' R = Hydraulic radius(ft) = A P P = Wetted perimeter(ft) = Bottom width+2* Depth* I+Side slope ratio 1 =0+2y I+51 therefore R =0.49y L (Column "8') = Length of run (ft) = I00ft H(Column "9') =Elevation change (ft) = 1.00 fl S (Column "10) = Longitudinal slope U/ft) = 0.010 Reformulate mannings equation: y = 0.706 ft The velocity was calculated using the following equation: Velocity (Column "IT) ) V = Velocity(fps) V = Q = 2.44 fps A The attached design information chart is the same chart found in the Curb Outlet System Supplement. Stormwater Calculations Stormwater-Water Quality Swale Information (Columns Follow Sample Calculations) "2„ „Y „4„ 1151, „6„ „7„ „8„ ,19" 1110,. „11„ „12" 2FF 3.49 1.30 2.19 0.51 10.00 6.31 11.25 100 0.575 0.006 0.99 2.32 2GG 2.89 1.30 1.59 0.56 10.00 6.31 10.30 150 0.62 0.004 1.01 2.00 21-11-1 3.35 0.99 2.36 0.46 10.00 6.31 9.66 100 0.455 -0.005 0.97 2.04 211 2.27 0.81 1.46 0.50 10.00 6.31 7.16 100 0.8 0.008 0.78 2.34 2JJ 2.25 0.84 1.41 0.51 10.00 6.31 7.26 140 1.07 0.008 0.79 2.31 2KK 1.67 0.57 1.10 0.49 10.00 6.31 5.15 120 2 0.017 0.60 2.84 21-1- 6.09 1.59 4.50 0.43 20.00 5.06 13.34 130 0.51 0.004 1.13 2.10 2MM 3.11 0.77 2.34 0.42 10.00 6.31 8.31 200 3.14 0.016 0.73 3.13 200 1.97 0.67 1.30 0.49 10.00 6.31 6.07 100 1 0.010 0.70 2.44 2PP 6.09 1.46 4.63 0.42 20.00 5.06 12.88 100 2 0.020 0.82 3.83 2VV 0.60 0.15 0.45 0.43 10.00 6.31 1.61 100 1.64 0.016 0.39 2.11 2B 6.23 1.33 4.90 0.40 20.00 5.06 12.60 230 0.95 0.004 1.09 2.11 2C 2.46 0.86 1.60 0.49 10.00 6.31 7.68 140 1.4 0.010 1 0.77 2.59 2F 2.02 0.95 1.07 0.58 10.00 6.31 7.38 120 0.5 0.004 0.89 1.85 2G 0.44 0.18 0.26 0.54 10.00 6.31 1.49 120 1.8 0.015 0.39 2.00 2H 2.69 0.42 2.27 0.36 10.00 6.31 6.10 110 0.5 0.005 0.82 1.82 21 3.09 1.39 1.70 0.56 10.00 6.31 11.01 200 1 0,005 1.00 2.19 2J 1.47 0.60 0.87 0.54 10.00 6.31 4.97 100 0.99 0.010 0.65 2.32 2K 2.30 0.83 1.47 0.50 10.00 6.31 7.29 290 1.2 0.004 0.89 1.84 2L 2.75 1.06 1.69 0.52 10.00 6.31 9.02 230 1.15 0.005 0.93 2.08 2M 2.23 0.43 1.80 0.38 10.00 6.31 5.42 250 1.14 0.005 6.78 1.77 2N 5.24 1.51 3.73 0.45 20.00 5.06 11.98 200 110.005 1.04 2.23 20 6.05 1.93 4.12 0.47 20.00 5.06 14.50 200 0.77 .004 1.17 2.12 2Q 1.72 0.67 1.05 0.52 10.00 6.31 5.67 130 1.43 .011 0.67 2.49 2R 3.60 0.62 2.98 0.37 10.00 6.31 8.42 190 0.92 .005 0.91 2.02 2S 0.85 0.26 0.59 0.46 10.00 6.31 2.49 200 1.14 .006 0.56 1.58 2T 1.81 0.21 1.60 0.33 10.00 6.31 3.78 100 0.5 .005 0.67 1.67 2U 229 073 1.56 0.47 10.00 6.31 6.84 130 4.6 .035 0.58 4.05 2V 1.35 0.51 0.84 0.51 10.00 6.31 4.38 130 2 0,015 0.58 2.65 2X 3.06 0.83 2.23 0.44 10.00 6.31 8.49 410 2.1 0.005 0.91 2.07 2Y 1.24 0.84 0.40 0.72 10.00 6.31 5.67 130 0.54 0.004 0.81 1.73 2Z 1.88 0.70 1.18 0.51 10.00 6.31 6.06 100 0.415 0.004 0.83 1.76 2Z1 4.23 1.68 2.55 0.53 20.00 5.06 11.31 100 0.42 0.004 1.05 2.06 2Z2 3.03 1.10 1.93 0.50 10.00 6.31 9.64 120 0.5 0.004 0.99 1.98 2BB 2.91 1.07 1 1.84 0.51 10.00 6.31 9.32 110 0.46 0.004 0.97 1.96 2ZZ 0.58 0.28 0.30 0.59 10.00 6.31 2.15 140 0.5 0.004 0.58 1.28 2YY 1.28 0.53 0.75 0.54 10.00 6.31 4.36 270 1.25 0.005 0.72 1.69 2Z3 2.93 0.90 2.03 0.47 10.00 6.31 8.60 100 0.5 0.005 0.91 2.06 2C1 3.51 0.85 2.66 0.42 10.00 6.31 9.29 130 0.6 0.005 0.96 2.03 2C2 0.85 0.32 0.53 0.51 10.00 6.31 2.75 200 4.9 0.025 0.44 2.81 2C3 3.64 1.36 2.28 0.51 10.00 6.31 11.75 120 1.31 0.011 0.89 2.98 2WW 1 1.68 1 0.44 1.24 0.43 10.00 6.31 4.59 100 0.9 0.009 0.65 2.19 Stormwater-Water Quality Swale Information (Columns Follow Sample Calculations) Column = 1.1" "2" "3" "4" "Y "6" "T' "8" 119" 1.10" "11" "12" Drainage Impervious Grassed Runoff Coef. Time of Conc. Intensity Flowrate Length Height Slope Depth Velocity swale Area (ac) Area (ac) Area (ac) C Tc (min) 110 (in/hr) Q (cfs) L(ft) H (ft) S y (ft) V(fps) 1A 1.88 0.69 1.19 0.51 10.00 6.31 6.01 100 1 0.010 0.70 2.44 1 B 0.28 0.20 0.08 0.75 10.00 6.31 1.33 100 1.5 0.015 0.37 1.95 1 C 1.00 0.40 0.60 0.53 10.00 6.31 3.34 100 1 0.010 0.56 2.11 1 D 6.09 1.61 4.48 0.44 20.00 5.06 13.41 100 3.33 0.033 0.76 4.68 1 E 1.42 0.48 0.94 0.49 10.00 6.31 4.36 100 2 0.020 0.55 2.92 1 F 5.56 1.39 4.17 0.43 20.00 5.06 11.96 150 2 0.013 0.86 3.23 1 G 6.21 1.78 4.43 0.45 20.00 5.06 14.17 215 1.5 0.007 1.04 2.64 1 H 5.29 1.62 3.67 0.46 20.00 5.06 12.44 250 1 0.004 1.10 2.07 11 4.24 1.71 2.53 0.53 20.00 5.06 11.43 400 2 0.005 1.02 2.21 1 K 5.56 2.05 3.51 0.51 20.00 5.06 14.30 200 2 0.010 0.97 3.03 1 L 0.66 0.29 0.37 1 0.56 10.00 6.31 2.32 120 1.5 0.013 0.47 2.09 1 M 3.79 1.49 2.30 0.53 10.00 6.31 12.56 115 0.5 0.004 1 1.08 2.15 1 N 2.84 1.04 1.80 0.51 10.00 6.31 9.07 110 0.71 0.006 0.89 2.29 10 3.49 1.32 2.17 0.51 10.00 6.31 11.34 102 0.5 0.005 1.02 2.19 1 Q 6.93 3.35 3.58 0.59 20.00 5.06 20.64 115 1.5 0.013 1.06 3.67 1 R 0.83 0.32 0.51 0.52 10.00 6.31 2.72 100 1 0.010 0.52 2.00 is 6.87 2.21 4.66 0.48 20.00 5.06 16.53 103 1.62 0.016 0.94 3.72 1T 1.75 0.74 1.01 0.55 10.00 6.31 6.03 135 1 0.007 0.74 2.18 1 U 2.25 0.86 1.39 1 0.52 10.00 6.31 7.35 150 1.5 0.010 0.76 2.56 IV 3.54 1.40 2.14 0.53 10.00 6.31 11.77 150 1.5 0.010 0.90 2.88 1 W 1 1.85 0.92 0.93 0.60 10.00 6.31 6.98 115 1 0.009 0.76 2.40 1 X 3.50 1.28 2.22 0.51 10.00 6.31 11.17 102 0.73 0.007 0.94 2.51 1y 5.76 2.04 3.72 0.50 20.00 5.06 14.52 185 1.5 0.008 1.02 2.81 1Z 4.50 1.51 2.99 0.48 20.00 5.06 11.05 150 1.8 0.012 0.85 3.04 1 SS 2.63 1.29 1.34 0.59 10.00 6.31 9.85 115 0.48 0.004 1.00 1.99 ITT 1.40 0.74 0.66 0.62 10.00 6.31 5.48 100 0.42 0.004 0.80 1.72 1AA 4.30 1.39 2.91 1 0.48. 20.00 5.06 10.37 100 1 0.39 0.004 1.03 1.96 1BB 4.00 1.07 2.93 0.44 10.00 6.31 11.04 245 2.45 0.010 0.88 2.84 1 CC 1 1.29 0.51 0.78 0.53 10.00 6.31 4.29 150 2.23 0.015 0.57 2.60 1DD 2.26 0.67 1.59 0.46 10.00 6.31 6.52 100 0.63 0.006 0.79 2.09 1EE 1.06 0.37 0.69 0.49 10.00 6.31 3.31 100 0.665 0.007 0.61 1.80 1 FF 7.76 2.40 5.36 0.47 20.00 5.06 18.33 130 0.77 0.006 1.18 2.65 1 GG 3.03 0.99 2.04 0.48 10.00 6.31 9.15 230 0.5 0.002 1.09 1.53 1HH 3.52 1.22 2.30 0.49 10.00 6.31 10.94 250 0.8 0.003 1 1.09 1.85 111 4.10 1.41 2.69 1 0.49 20.00 5.06 10.19 200 1.34 0.007 0.92 2.39 111 1.34 0.28 1.06 0.40 10.00 6.31 3.35 100 0.32 0.003 0.70 1.37 1 KK 1.24 0.43 0.81 0.49 10.00 6.31 3.86 110 0.385 0.004 0.72 1.47 1 LL 2.09 0.80 1.29 0.52 10.00 6.31 6.83 110 0.65 0.006 0.81 2.07 1MM 3.23 1.11 2.12 0.49 10.00 6.31 10.00 110 0.5 0.005 0.99 1 2.06 2DD 3.20 1.10 2.10 0.49 10.00 6.31 9.91 220 0.92 0.004 1.00 1.99 2EE 1.89 0.98 0.91 0.61 10.00 6.31 7.31 T 100 1.72 0.017 0.68 3.14 INFILTRATION TRENCH Proj. No. 218-01 4/24/2007 I NFI LTRATION-TRENCH-Marina-pkg.xls BASIN DATA Drainage Area Designation: DRAINAGE AREA Trench Designation: Marina Parking Lot Receiving stream class SC waters Onsite Area = 0.38 acres Onsite Impervious Area = 0.25 acres Offsite Area = 0.00 acres Offsite Impervious Area = 0.00 acres Total Area = 0.38 acres Total Impervious Area = 0.25 acres Percent Impervious = Impervious drainage area (acres)/Drainage area (acn 65.8 A) Runoff Volume to be Controlled per State NCDEHNR Administrative Code 15A NCAC 2H .1000 (1.5 inch event for SA waters, 1 inch event for others) Using the runoff volume calculations per"Simple Method" as described by Schueler(1987): where: Rv = runoff coefficient= storm runoff(inches)/storm rainfall (inches) I = Percent Impervious = Impervious portion of the drainage area (acres)/Drainage area (acres) Rv= 0.05 + 0.009(I) Rv = 0.05 + 0.009 * 65.8 = 0.642 (in/in) Volume to be controlled from the design storm event: where: Design rainfall = 1.5 (in) Rv = 0.642 (in/in) Drainage Area = 0.38 (acres) Volume required (cf) = rainfall (in) x Rv (in/in) x Drainage Area (acre) x 1/12(feet/inches) x 43560 (sf/acrf Vreq'(=1.5 * 0.642 * 0.38 * 1/12 * 43560 = 1329 cubic feet INFILTRATION TRENCH Project No. 801-27 I N FI LTRATI O N-TRE N C H-Marina-pkg 4/21/2007 Coastal Construction Design Calculations -(Infiltration Trench A) o� CA.PE FEAR Eng151 Poole Road,Suits 100 BeNille,NC 28451 TEL (910)383-1044 FAX (910)383-1045 www.capefeareng.com MASS INFLOW/STORAGE /AND EXFILTRATION FROM MARINA PARKINGINFILTRATION TRENCH Procedure in Accordance With FHWA-TA-80-218 Design Guide Lines Infiltration Rate Q (cfs) = K'I"A Drainage Area ( c)= 0.38 Pipe Dia. ) 2M Storm Event= 10 Trench width (ft) = 6.0 Length of pipe and trench= 165 No. of Pipes in Trench = 1 Trench side height (ft) = 3.0 Pipe Area (ft2) = 3.1 A= Area of exfiltration = 990 ft2 Stone Area (ft2) = 14.9 K= Coeff of permeability= 3.5E-03 cm/sec Stone Voids 40% (ft2) = 5.9 or 5 in/hour Storage per ft= 9.1 i = Hydraulic gradient = 1.00 Total Available Storage (co = 1499 Q/ _ 0,;11..; cfs/trench Q/ = 76 jgpd/ft2 Total Available Storage = 1499 > 1329 =Required Volume OK,Total Available Volume will Contain 1.5 - Inch Design Storm CALCULATIONS 3of3 PROJECT: SEASCAPE 0 Holden Beach DATE: 04-21-07 CLIENT: Coastal Commun/ties PROJ. NO: 601-27 SUBJECT: Infiltration Trench - Marma Parking Lot DESIGNED BY: M. 5efi°e15 DETAIL: Wrap stone in a Geo-Tech. filter fabric E/ev. _ 14.0' 12 V4'to l-112' W�5hed Stone 3,O" 24" Elev. _ l l.0' Ilk Use 24"dia. perforated pipe Assume a 40% void ratio for the stone FFFECTIVEAREA /n cros5-5ect/on.= (Pipe Area) + ((Stone Area)x(40%)) = (Pi'l 2) + (((l 5.5 x 4.0) - (Pi'l 9)x 409voJ = 3. 14' + 5.54' = 5.06 5q. ft. 151 Poole Road,Suite 100 CAPE FEAR BeNille,NC 28451 TEL (910)383-1044 Engineering, Inc. FAX (910)383-1045 vp www.capefear,ngineering.com INFILTRATION TRENCH Proj. No. 801-23 4/24/2007 Design Calculations for INFILTRATION-TRENCH-Boat-Trailer.xls Seascape @ Holden Beach Boat Trailer Parking Lot BASIN DATA Drainage Area Designation: DRAINAGE AREA #1 Trench Designation: Boat Trailer Parking Lot Receiving stream class SC waters Onsite Area = 0.97 acres Onsite Impervious Area = 0.68 acres Offsite Area = 0.00 acres Offsite Impervious Area = 0.00 acres Total Area = 0.97 acres Total Impervious Area = 0.68 acres Percent Impervious= Impervious drainage area (acres)/Drainage area (acre 70.1 A) Runoff Volume to be Controlled per State NCDEHNR Administrative Code 15A NCAC 2H .1000 (1.5 inch event for SA waters, 1 inch event for others) Using the runoff volume calculations per"Simple Method" as described by Schueler(1987): where: Rv= runoff coefficient= storm runoff(inches)/storm rainfall (inches) I = Percent Impervious = Impervious portion of the drainage area (acres)/Drainage area (acres) Rv = 0.05 + 0.009(I) Rv= 0.05 + 0.009 * 70.1 = 0.681 (in/in) Volume to be controlled from the design storm event: where: Design rainfall = 1.5 (in) Rv = 0.681 (in/in) Drainage Area = 0.97 (acres) Volume required (cf) = rainfall (in) x Rv (in/in) x Drainage Area (acre) x 1/12(feet/inches) x 43560 (sf/acrf Vreq'c=1.5 * 0.681 * 0.97 * 1/12 * 43560 = 3596 cubic feet INFILTRATION TRENCH Project No. 801-27 INFILTRATION-TRENCH-Boat-Trailer 4/21/2007 Coastal Construction Design Calculations -(Infiltration Trench A) CAPE FEAR Engineering, Inc. 157 Poole Road,Suite 100 Belville,NC 26451 TEL (910)383-1044 FAN (910)383-1045 www.capefeareng.com MASS INFLOW/ STORAGE/AND EXFILTRATION FROM BOAT TRAILER INFILTRATION TRENCH Procedure in Accordance With FHWA-TA-80-218 Design Guide Lines Infiltration Rate Q (cfs) = K`I'A Drainage Area c = U.91 Pipe Dia. _ Storm Event= 10 Trench width (ft) = 6.0 Length of pipe and trench= 415 No. of Pipes in Trench = 1 Trench side height(ft) = 3.0 Pipe Area (ft2) = 3.1 A=Area of exfiltration = 2490 ft2 Stone Area (ft2) = 14.9 K= Coeff of permeability = 6.4E-03 cm/sec Stone Voids 40% (ft2) = 5.9 or 9 in/hour Storage per ft= 9.1 i = Hydraulic gradient = 1.00 Total Available Storage (cf) = 3770 Q/ = E?S2: ;:;cfs/trench Q/ = 1'35 i'gpd/ft2 Total Available Storage= 3770 >3596 =Required Volume OK, Total Available Volume will Contain 1.5 - Inch Design Storm CALCULATIONS sots PROJECT: 5EA5CAPf A? Holden Beach DATE: 04-21-07 CLIENT: Coa5talCommumtie5 PROJ. NO: 601-27 51-113JECT: Infiltration Trench - Boat-Trader Parkmg Lot DESIGNED BY: M. 5effe/5 Of TAIL: Wrap Stone in a Gec-Tech. filter fabric Elev. _ l l.O' /2 .V4'ta l-112' Washed Stone 24" " f/ev. = a 0' Ilk 6'0 Use 24"dia. perforated pipe Assume a 40% void ratio for the stone fFFfCTIVE AREA /n cro55-5ection = (Pipe Area) + ((Stone Area)x(40%)) = (PI'l) + f((15.5x4.0) - (PI x40%J = 3. 14' + 5.94' = 9.06 5q. ft. 151 Poole Road,Suite 100 CAPE FEAR Be/vi/le,NC 28451 TEL (910)383-1044 Engineering, Inc. FAX (910)383-1045 vp mi wxapefearengineering.Qom INFILTRATION TRENCH Proj. No. 801-27 6/25/2007 Design Calculations for INFILTRATION-TRENCH-1_3in-calc.xls Seascape @ Holden Beach Clubhouse Inf. Trench BASIN DATA Drainage Area Designation: DRAINAGE AREA #1 Trench Designation: TR-1 Receiving stream class waters nsi a Area = U.fZ acres Unsite Impervious Area = 0.48 acres Ottsite Area = 0.00 acres Ottsite Impervious Area = 0.00 acres Total Area = 0.72 acres Total Impervious Area = 0.48 acres Percent Impervious = Impervious drainage area (acres)/Drainage area (acres) = 66.7 A) Runoff Volume to be Controlled per State NCDENR Administrative Code 15A NCAC 2H .1000 (3 inch event) Using the runoff volume calculations per"Simple Method" as described by Schueler(1987): where: Rv = runoff coefficient= storm runott(inches)/storm rainfall (inches) I = Percent Impervious = Impervious portion of the drainage area (acres)/Drainage area (acres) Rv = 0.05 + 0.009(I) Rv = 0.05 + 0.009 . 66.7 = U.650 (in/in) Volume to be controlled trom the design storm event: where: Design rainfall = 3 (in) Rv = 0.650 (in/in) Drainage Area = 0.72 (acres) Volume required (cf) = rainfall (in)x Rv (in/in) x Drainage Area (acre) x 1/12(feeUinches) x 43560 (sf/acre) Vreq'd= 3 * 0.650 * 0.72 * 1/12 * 43560 = 5097 cubic feet INFILTRATION TRENCH Project No. 801-27 IN FI LTRATION-TRENCH-1 3in-calc.xls 6/25/2007 Coastal Construction Design Calculations-(Infiltration Trench A) ---�� ,1G°�f CA1 L r- �J Engineering, Inc. 151 Poole Road Su&700 Bclvd1o.NC 2845t TEL(910)383 1044 FAX(910)383 1045 WWW capefearengineering.cam MASS INFLOW/STORAGE/AND EXFILTRATION FROM INFILTRATION TRENCH Procedure in Accordance With FHWA-TA-80-218 Design Guide Lines Infiltration Rate Q(cis) =K'I'A Storm Event= 10 Trench width(it)= 24.5 Length of pipe and trench= 96 No.of Pipes in Trench= 5 Trench side height(it)= 4.0 Pipe Area(ft2)= 24.5 A=Area of exfiltration = 2352 t12 Stone Area(ft2)= 73.5 K=Coeff of permeability= 7.8E-03 cm/sec Stone VOlos 4U%(n2)= 29.4 or 11 in/hour Storage per it= 53.9 i=Hyarauuc gracnent = 1.UU I otal Avanaole Storage(cp= 01/6 U/ = O.6U cis/trench U1 = 1Eb::1:gPamz Total Available Storage= 5176>5097 =Required Volume OK,Total Available Volume will Contain 3 -Inch Design Storm INFLOW/EXFILTRATION/STORAGE RATINGS CHART AVAILABLE --TM= TIME MASS INFLOW VOLUME REOUIREMENTS STORAGE SURPLUS/(DEFICIT (min) (cubic feet) (cubic feet) (cubic feet) (cubic feet) (cubic feet) 3,629 3.172 2.837 2.587 2,402 1,44b 2.169 2,042 2.889 2.167 2,435 2.793 4.171 5,795 9,379 21,107 45,799 0 0 0 0 System can Store and Infiltrate the Design Storm Event- YES INFILTRATION BASIN - Schueler Method 6/25/2007 Design Calculations for Coastal Construction Clubhouse—infiltration—Pond-1-3 in calc.xls Brunswick County, NC 1of8 Engineering, Inc. 151 Fooie Hord.svde]00 BeWiL'c,NC 28451 TEL(910)383 1044 FAX f910)383 10, WWW cape(earengineering.com BASIN DATA Drainage Area Designation: Swale Designation: INFILTRATION BASIN Receiving stream class SA waters Onsite Area = 1.60 acres Onsite Impervious Area = 1.07 acres Offsite Area = 0.00 acres Offsite Impervious Area = 0.00 acres Total Area = 1.60 acres Total Impervious Area = 1.07 acres Percent Impervious = Impervious drainage area (acres)/Drainage area (acres) = 66.9 A) Determine volume to be controlled from storm (3 inch event) Using the runoff volume calculations per"Simple Method" as described by Schueler(1987): where: Rv= runoff coefficient = storm runoff(inches)/storm rainfall (inches) I = Percent Impervious = Drainage area (acres)/ Impervious portion of the drainage area (acres) Rv = 0.05 + 0.009(I) Rv = 0.05 + 0.009 * 66.9 = 0.652 Volume to be controlled from the design storm event: where: Design rainfall = 3 (in) Rv = 0.652 (in/in) Drainage Area = 1.60 (acres) Volume required (cf) = rainfall (in)x Rv(in/in) x Drainage Area (acre)x 1/12(feet/inches)x 43560 (sf/acre) Vreq'd = 3 * 0.652 ' 1.6 * 1/12 * 43560 = 11358 cubic feel INFILTRATION BASIN - Schueler Method 6/25/2007 Design Calculations for Coastal Construction Clubhouse—infiltration—Pond-1-3 in calc.xls Brunswick County, NC 2of8 Engineering, Inc. ;51 Pnoie Road,Bulls;00 BeWdle.AC 28,151 TEL(910)383 1044 FAX(910,)383-1045 WWW.capefearengineering.com Determine the volume of the proposed pond: POND GEOMETRY Contour Contour Comments Elevation Area Incremental Storage (msl) (so (cf) Bottom Elevation 13 2257 2740 Storage Elevation 14 3223 3742 15 4261 4813 16 5364 2826 16.5 5940 Total Volume of Pond = 14121 cubic feet Compare volume proposed to volume required from the design storm event: Vprop = 14121 cf > Vreq'd = 11358 cf (OK-proposed basin volume is greater than minimum required volume) INFILTRATION BASIN - Schueler Method 6/25/2007 Design Calculations for Coastal Construction Clubhouse—infiltration—Pond-1-3 in calc.xls Brunswick County, NC 3of8 Ll I Engineering, Inc. 151 Poorc Road.$OCC 100 \✓� Bel-pYe.NC 28.951 TEL(910)383 1044 FAX(910)383 1045 WWW.capefearengineering.com B) Check pond infiltration rate for capacity to control the 25 year-24 hour storm event with no discharge The average weighted coefficient of runoff is determined by. C ave = Sum[CA I/Sum[A] Description AREA C CA Impervious Area 1.07 0.95 1.017 Pervious Area 0.53 0.2 0.106 Sum A= 1.6 Sum CA= 1.123 C ave = 1.123 / 1.6 = 0.702 Determine required discharge from 25 year-24 hour storm event. Q regd = Cave x I x A Q regd = 0.70 " 0.33 " 1.6 = 0.37 cfs where: I = intensity for 25 year-24 hour storm event from historic data = 0.33 in/hr A = drainage area = = 1.60 acres Cave = weighted coefficient of runoff = 0.70 Check available rate of infiltration provided by proposed swale: where: I = infiltration rate of soil (Soil Type = Baymede & Kureb sands) = 5 in/hr A= bottom area of swale = = 2257 sf Qavail = IA = 5 in/hr 2257 sf 1 ft/12 in " 1 hr/3600sec = 0.26 cfs Compare rate of infiltration with runoff rate from the 25 year storm event: Qavail = 0.26 cfs > Q reqd = 0.37 cfs (NG-check discharge for 25 yr-24 hr storm event) INFILTRATION BASIN - Schueler Method 6/25/2007 Design Calculations for Coastal Construction Clubhouse—infiltration—Pond-1-3 in calc.xls Brunswick County, NC 4of8 CaPE L17EAR Engineering, inc. 157 Poole Hnad Sui:c ;GC Be!r!'e.AC 28451 TEL(910)383-1044 FAX(910)383 l045 WWW capefea,engineering.com C) Check the 10 year-10 minute storm event to confirm that basin has capacity without flushing system where: I = intensity for 10 year-10 minute storm event from historic data = 6.3 in/hr A = drainage area = = 1.60 acres Cave =weighted coefficient of runoff = 0.70 Determine discharge rate from 10 year-10 minute storm event: Q 10-yr= Cave x I x A Q 10-yr= 0.70 * 6.3 1.6 = 7.07 cfs Determine discharge volume from 10 year-10 minute storm event: V 10-yr= Q 10-yr * 10 min. duration " 60 sec/min. = 4243 cf Check available volume of the proposed infiltration basin: V avail = design volume (from geometry table) = 14121 cf Compare design volume of infiltration basin to discharge volume from 10 year storm event of 10 minute duration: Vavail = 14121 cf > V 10-yr= 4243 cf (OK-basin has adequate capacity for 10-yr event without flushing) Compare infiltration system drawdown time to maximum drawdown period of 5 days T = V regd / Q avail " 1 hr/3600 sec T = 11358 cf / 0.26 cfs 1 hr/3600 sec = 12.08 hours (OK-system draws down in less than 5 days) Stormwater-Water Quality Swale Information (Columns Follow Sample Calculations) Column = „� , „2„ „3„ t!t�! Drainage Impervious Grassed RuConc. Intensity Flowrate Length Height Slope Depth Velocity Swale Area (ac) Area (ac) Area (ac) in) 125 (in/hr) Q (cfs) L (ft) H (ft) S y(ft) V(fps) 2HH 5.04 1.82 3.22 0.50 20.00 5.82 14.75 100 0.455 0.005 1.14 2.27 2KK 2.96 1.34 1.62 0.57 10.00 7.17 12.04 120 2 0.017 0.83 3.51 **NOTE**125 = 155.431/ Tc +26.2 ^0.857 -- 04/17/2007 12:45 9104585261 RFTS PAGE 02/07 .; ` April 17, 2007 Residential Foundation Testing Services;K1,C Cape Fear Engineering,Jsic., 151:Poole Road,-Suite 100 Relville;North Carolina 28451 Attention- .. : ..Mi.tames Davis J. Reference Infiltration Testing and Seasonal High Watertable Estimates Marina and Clubhouse Areas Seascape Development Holden Beach;North Carolina kFTS,Job.No_ 214 07 Dear Mr. Davis: RFTS is pleased to provide testing services during the construction of the infrastructure and development of:scascape near Holden Beach,North Carolina It is our understanding that the stormwater structures were previously installed and the purpose of our testing was.to;provide,seasonal high water estimates and,infiltration rates at these specific structures.to serve as additional design inforination.. 'DESCRIMON OF ACTIVITIES AND FINDINGS As.requested; our staff visited the site on April 13; 2007,to perform infiltration testing and estimate the seasonal-high watertable at four locations identified by you. These locations aie;idenfified as follows: Tegt No:: Location V InfiltiutionTceneh-Clubhouse 12 . Infiltration Basin_Clubhouse 3 Boat.Cleanout/Parldug Area. 4 Marina Parking Area Seasonal 140➢Vatertable Estimate .. Eland auger,borings;were advanced at each location to depths ranging from 6 to l0 feet below the existing'ground surface'rut the general areas identified by you.In the referenced parking areas, testing wm.performed adjacent to the pavement or in landscape islands within the parking areas. The. encountered soils were Iogged.and visually classified by depth and a;Munsell Soil,Color.Chart.was.used to determine the hue, value, and chroma . F7S- of the visually distinct soil layers. Our:soil.logs are presented in Table 1. - 1305 3A Carolina Beach.Ave N. ofTca:.91"56-1377 Carolina Beach, North Carolina 26428 Fax:910 458-5261' 04/17/2007 12: 45 9104585261 RFTS PAGE 03/07 RF'TS Job.No.214-07 Page.Two . G.ape.Fear Engineering lnc April 17,2006 . Attest locations .1 and Z where previously constructed infikration structures are in place;:the:soils encountered our borings consist of interbedded clean fine to medium ' sands with no.disdnct'zohes of soil cementation in either profile. Comparison of the soils to the Mansell Chart suggests the presence of a limited zone of aerated soils, indicative of seasonal high.water within the unsaturated zone 9'35 inches'below the bottom of the trench and location 1 and 49 inches below the;.bottom of the basin attest location 2. Measurements made' 2 hours after augering indicate .'a depth .to standing water in Boreiidles 1 and.2 of 50 and 60,in6es below the existing ground,surface,respectively. As stated above; test locations 3 and 4 were;pexformed.adjacent to the pavement at both of these locations. Additional hand auger borings were advanecd within the islands of the . boat'parking'lot and on- the opposite side of.the parking lot in the marina area- The. purpose ofthese additional borings was to visually compare the consistency of the nearby soils to that at the test location In both areas the soils were found to be similar. 1nfiJtrahon.Te�ri-ptg htfiltranon testing was performed rising a model 2800 Crielph Permeameter which is a eonstant;ltead device.which operates on the Marione siphon principle and is referenced in AS'N D'5126. The 'permeameter is used to determine field saturated hydraulic conductivity:in,centimeters per,second for soil at.a specified depth. This testing involves advsncitig:$borehole;to the.desired infiltiation depth:and introducing.water at a constant head to determine-the steady state flow rate.from which the hydraulic conductivity can be calculated .Testing was,pertormed.at locations 1. and 2 at approximately 7 inches below the surface of these structures::Testing was'performed at locations 3.and 4 at.38 and 40 inches,below the`existingground surface, respectively. The results of our permeameter testing are. presented inTable.2:. RECOMMENDATIONS , Based on the results of our field testing and,soil classifications at the test locations, we ; recommend,,ultimate .application rates of 11 Inches per honr at location 1, 5 inches per hour.at location 2, 9. inches per:hour,at location,3;,and 5 inches per hour at location 4 'These recommendations should'be reviewed by appropriate regulatory authorities before finalizuig the details'.of any civil design 04/17/2007 12:45 9104585261 RFTS PAGE 04/07 'RFTS Job I3o.214 07 Page Ibuee Cape Feai Engineering,Inc April 17;2006 CLOSURE . Please find attached our field data and.a sketch,showing the approximate.test locations. 'If you hive'any.questions after reviewing this letter,please do,not.hesitate to contact us at your convenience Sincerely RFTS,PLLC David L:Winstead Steven D. Kelly,P.E. . Field Operations.Manager. Senior Engineer 04/17/2007 12:45 9104585261 RFTS PAGE 05/07 Table I Mansell Soil Classifications Marina and Clubhouse Areas Seascape Development Holden Beach;North Carolina RF FS.Job No.214.07 Loc: Soil Description Hite Value Chrome Depth Comments On,)' 1 Olive Yellow fuze to mediiun,. 2.5Y 6 8 0-8 Clean Yellowish Brown fine to medium I OYR, 5 8 9-23 Clean Yellow fine to medium SAND 2.5Y:. 7 8 23-35 Clean Light Yello nwish Brow fine to 2.5Y . 6 3 35-50 . Moist medium.SAND . gHW x Brown fine to.medium_SAND 7.5Y 4 2 50-69 H2O 50" 2 Strong.Brown ftne to.medium 7.5YR . 5 8 0-20 Clean SAND Yellow fine-to medium SAND IOYR 7 6 .20-26 Clean . White fine tomedium SAND l OYR 8 1 26-49 Clean White1iincIo medium SAND SY 8 1 49-60 Moist SHWT' Gray fine to medium SAND 5Y 6 1 60-78• H2O A 63" 3 TowivRootmat 0-12 Gra .ftne.to mediutmSAND IOYR 5 1: . 12-4 7 Clean 17ark Yellowish Brown;fine to IOYR 4 4 17-24 Clean . medium SAND Yellowish Brawn fine to medium ..1 OYR 5 4 . 24-34 . Clean SAND , ' Olive Brown fine to medium.'. 2.SY 4 3 34-39 Clean SAND Light YellowisMh Brown fine to .2.5Y . 6. 3 ' 39-53 Some ' medium SAND model' Light Yellowish Brown fine to 2.SY: 6 . 3 53-57 Moist mediurirSAND .. . SIRWT Pale Yellow 6qe to medium . 2.5Y 7 3 57-65 Moist SAND:. Olive fine to medium SAND 5Y 5 3 65-86 H2O 787 04/17/2007 12:45 91045.85261 RFTS PAGE 06/07 Table 1 -continued Muxmti Soil Classifications Marina.and Clubhouse.Areas Seascape Development Holden Beach,North Carolina RFTS Job'No:2.14-07 Loc. Soil Description Hue Value Chroma Depth Comments in. 41 T soil . . O,2 Light;Yellowish Brown fine m 2.5Y 6 4 -2-25 Clean mdiu em SAND Gray fine to medium SAND 2:5X. 76, 1' 25-29 Trace roots Light Yellowish Brown fine to 2.5Y. 6. 4 29-44 Clean medium SAND- Pale Yellow fine,to medium 2:5Y 7 4 . 44-62 Clean SAND Yellowish Brown fine to medium, 1 OYR 5 4 62-66 Clean. SAND .. Dark Brown fine to medium. 'IOYR 3 3 66-81 Moist SAND, SHVV 1 Pale Brown fine to medium 1 OYR., 6 3 81-99 Moist SAND Dark Yellowish Brown fine to' . '.IOYR' 3 4 99-113 Moist medium SAND Very.Dar&Brown fine to medium. 10YR 2 2 113-123 H2O Qa SAND 118": 04/17/2007 12: 45 9104525261 RFTS PAGE 07/07 Table 2 Guelph Permeameter.Test Results q. Marina and.Clubhouse Areas Seascape:Development Holden Beach;North Carolina RPTS Job No. 214j07 Location 1 2 . . 3 . 4 th in. 7 7. 38 . .40 HI cia) 5 . 5 5 5, Ri cmLeun 11.0 . 13.8 6.6 4.8 Ris cm/sec 011833 0.230 0.110 0.080 H2 cm 10. . 10 10 10 . Rz cm/min 14A. 16:6 8.4 7-8 1t s. cm/sec 0.240 0.277 0.140 0:130 Ka cm/sec 0.0084 ` 0.0037 0.0064 0.0035, 1piw cm/we 0.1.689 0.2321 0.1047 . 0.0527 a cm 0.0497 0.0159 0.0612 76.0675 Defiwtion'of Terms Rja Established 3 or-more,constant rate of water level change(cm/min) RGs Calculated steady state low rates(cm/sec) Hl,z Maitttained Head of H2O(cm) . K�.—Calculated field saturated hydraulic conductivity(cm/sec) Vim.=Mlatric Aux:potential(cm(sec) a:.:Alpha parametcr Depth—Depth of well hole(in.) Location-Test location identification number. Note: Diameter of well is 3.0 cm: PROP.D/12 O EY/ST.PE5!/3� � U 263 Test Site 12 .O/!/ Fat.R/ .. _ /4. $HWT=9.4' Double C/ Ea, P. To Clubhouse _ � o .� in to .�N r+ re t5Re1/ pta aIL E15t.t/ev. _ /3.9' l6 anon p , 0 SW 5HOT=9.73' U�c on m O� Cagre Lane Right-of--Way Vane.4� c� O /Pnvate) r tb 0. et5rtel3 k2q 23 w5t, v. / 5' Q� snwr=s.a 0 , EX/ T.D/ Ar p j 2 t.D Test Site/4 G t.,5t.tom. _ /s.a SHWI'a B.25' U M5T.D/ `• Beaufam Street Liearegard Avenue _ Rlght-of-Way Vanes Onvate) 151 (PnvatcJ CAPE FEAR Bel•iI�NC 18 51 Suile l� 60 O 60 /20 Ill (910) J83-1044 Engineering, Inc. FAX (910) J83-1045 Graphic$talc www.copefeorengineering.com / inch=CO feet �oF ATE"? Michael F.Easley,Governor William G.Ross Jr.,Secretary G North Carolina Department of Environment and Natural Resources 7 rV r Alan W.Klimck,P.E.Director —{ -Division of Water Quality O C Coleen H.Sullins,Deputy Director Division of Water Quality July 3, 2003 � 1150" Mr. Mark Saunders, President Seascape at Holden Plantation, Inc. 37I0 Stone Chimney Road. Supply,NC 28462 SUBJECT: Approval of 401 Water Quality Certification and Additional Conditions Seascape Subdivision and Marina DWQ Project#001078 Modification Brunswick County Dear Mr. Saunders: You have our approval, in accordance with the attached conditions(WQC # 3400)to conduct the following activity at your property located off Stone Chimney Road in Brunswick County. This approval allows you to: 1). Impact a total of 0.73 acres of wetlands/waters and approximately 60 feet of-stream to construct 'Seascape Plantation Subdivision.and Marina. These impacts include all previously permitted impacts that were permitted under a NW 12, NW 18, NW 14, and CAMA Major #5-01 and the additional impacts for 4 road crossings described in the CAMA Major Modification request; 2). Construct a 75 slip marina with two boat ramps, retaining wall, wooden walkway, clubhouse buildings, and parking as described in the CAMA Major Modification#5-01 application; 3). Construct 4 private shared piers with a total of 8 boat slips for lots 276-283. This approval is only valid for the purpose and design that you described in your CAMA application received by the Division of Water Quality(DWQ)on May 9, 2003, and additional information received on June 20, 2003. After reviewing your application, we have determined that General Water Quality Certification Number 3400 covers this activity. This Certification allows you to use your CAMA Permit when the NC Division of Coastal Management issues it. Please.keep in mind that there may be additional Federal, State or Local regulations applicable to your project, such as (but not limited to) Sediment and*Erosion Control, Non- Discharge and Water Supply Watershed regulations and Coastal Stormwater. In addition, this approval will expire when the accompanying CANIA Permit expires unless otherwise specified in the General Certification. This approval is only valid for the purpose and design that you described in your CAMA Major Permit application received by the Division of Coastal Management on April 25, 2003. If you change or modify your project, you must notify the Division (DWQ) in writing and you may be required.to send us a new application for a.new certification. If the property is sold, the new owner must be given a copy of the Certification and approval letter and is thereby responsible for complying with all conditions. If total wetland fills for this project(now or in the future)exceed one acre, compensatory mitigation may be required as described in I5A NCAC 2H .0506 (h). For this approval to be valid, you must follow the conditions listed in the attached certification and the additional conditions listed below: �V:vh i�iflst] NGDEtMi N.C.Division of Water Quality 1617 Mail Service Center Raleigh,North Carolina 27699-1617 (919)733.7015 Customer Service I-877-623-6748 Page Two Mr. Saunders DWQ Project #001073 July 3, 2003 1).Culvert Installation The culverts required for this project shall be installed in such a manner that the original stream profiles are not altered. Existing stream dimensions (including the cross section dimensions, pattern, and longitudinal profile) are to be maintained above and below locations of each culvert. The culverts shall be designed and installed to allow for aquatic life movement as well as to prevent head cutting of the streams. If any of the existing pipes are or become perched, the appropriate stream grade shall be re-established or, if the pipes installed in a perched manner, the pipes shall be removed and re-installed correctly. The culvert(s) shall not be installed in such a manner that will cause aggradation or erosion of the stream up or down stream of the culvert(s). Existing stream dimensions(including the cross section dimensions, pattern and longitudinal profile)are to be maintained above and below locations of each culvert. As such, it is required that you provide the plans with adequate details that indicate that the current stability of the stream will be maintained or enhanced. You must receive written approval from this Office for the above plans before the culvert(s) is installed. The culvert(s) must be installed according to the approved plans. The establishment of native, woody vegetation and other soft stream bank stabilization techniques must be used where practicable instead of rip rap or other bank hardening methods; If rip-rap is necessary, it shall not be placed in the stream bed, unless specifically approved by the Division of Water Quality. Installation of culverts in wetlands must ensure continuity of water movement and be designed to adequately accommodate high water or flood conditions; 2). Upon completion of all work approved within the 401 Water Quality Certification or applicable Buffer Rules, and any subsequent modifications, the applicant is required to return.he attached certificate of completion to the 401/Wetlands Unit,North Carolina Division of Water Quality, 1650 Mail Service Center, Raleigh, NC, 27699-1650. Please send photographs upstream and downstream of each culvert site to document correct installation along with the Certificate of Completion form; 3). The turbidity standard of 25 NTUs (Nephelometric Turbidity Units) shall not be exceeded as described in 15 A NCAC 2B .0200. Appropriate sediment and erosion control practices must be used to meet this standard; 4). Deed notifications or similar mechanisms shall be placed on all retained jurisdictional wetlands, waters and protective buffers in order to assure compliance for future wetland, water and buffer impact. These mechanisms shall be put in place prior to impacting any wetlands, waters and/or buffers approved for impact under this Certification Approval and Authorization Certificate. A sample deed notification can be downloaded from the 40l/Wetlands Unit web site at http://h2o.enr.state.nc.us/ncwetlands. NCDENa N.C. Division of Water Quality 1617 Mail Service Center Raleigh,North Carolina 2 7699-16 17 (919)733-7015 Customer Service 1-877-623-6748 Page Three Mr. Saunders DWQ Project#001078 July 3, 2003 Please notify this Office at the number listed below if any problem arises during the construction of the project that may affect water quality. If you do not accept any of the conditions of this certification, you may ask for an adjudicatory hearing. You must act within 60 days of the date that you receive this letter. To ask for a hearing, send a written petition conforming to Chapter 150B of the North Carolina General Statutes to the Office of Administrative Hearings, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. This certification and its conditions are final and binding unless you ask for a hearing. This letter completes the review of the DWQ Permit#001078 under Section 401 of the Clean Water Act. If you have any questions, please telephone Noelle Lutheran or Rick Shiver at 910-395-3900. Sincerely, Alan W. Klimek, P.E., Director l� Division of Water Quality Attachments: GC #3400 Certificate of Completion cc: Laura Stasovich—Land Management Group Perry Davis, P.E.—Cape Fear Engineering Corps of Engineers Wilmington Field Office—Henry Wicker WiRO-Noelle Lutheran 401/Wetland Unit, Central Office—Cyndi Karoly CAMA—Jim Gregson CAMMA Raleigh—Doug Eluggett Central Files tNCOED;+ N.C.Division of Water Quality 1617 Mail Service Center Raleigh,North Carolina 27699-1617 (919)733-7015 Customer Service 1-877-623-6748 12-06-2006 03:17Pm From-SEA SCAPE +9108424945 T-266 P.002/003 F-704 * LM. LAND MANAGEMENT GROUP Nc. Environmental Consultants 11/27/06 Debbie Wilson Division of Coastal Management 127 North Cardinal Drive Wilmington,N.C. 28405-3845 Re: Renewal of Permit Number 5-01, Seascape, Coastal Communities,Inc.; New contact t information Dear Debbie, On behalf of Coastal Communities; Inc, I am-requesting the renewal of their CAMA . Permit Number 5-01 for Seascape. There are no proposed changes to the Seascape project.Please change the contact information on the renewed permit to: Coastal.Communities,Inc., . c/o Robert B. Lewis,project manager Seascape at,6loldea Plantation 1960'Arnold Palmer Drive Shallotte,N.C. 28470 910-443-9758 910-754-2983'£ax blewis acoas-Lalcommunities-com We have enclosed the$100 renewal fee check and a copy of the existing permit for your reference. Please contact me with any questions that you may have. Thank you for your assistance.' ' _: www.lmgroup.net • ihfo.@Imgroup.net • Phone: 910.452.0001 • Fax: 910.452.0080 3805 Wrightsville Ave., Suite 15, Wilmington, NC 28403 • P.O. Box 2522,. Wilmington, NC 28402 2-P6-2006 03:17pm From-SEASCAPE +9108424945 T-255 P.003/003 F-704 Sincerely, Steve Morrison Environmental Consultant Encl: YO0 fee check to NCDENR Cc: Bobby Lewis (Coastal Communities) NOV. -14' 03 (FRI) 08,45 DERNR COSTAL MGMT TEL:919 733 1495 P. 002 Pornlit Class Permit Number MODIFICATION/MAJOR 5-01 AMENDED STATE OF NORTH CAROLINA By CRC Variance DepflrEment of Environment and Natural Resources and Coastal Resources Commission Vermin for 7C Major Development in an Area of Environmental Concern pursuant to NCGS 113A-118 � Excavation and/or filling pursuant to NCGS 113-229 issued to Coastal Communities,Inc.,c/o Sean Scanlon, 131 Ocean Blvd.West Holden Beach,NC 28462 Authorizing development in Brunswick County at adi. A1WW, at Seascape S/D Phase II, off ,Sine C_:himney Rd. (SR 1.1191 , as requested in the perminee's application dated 4125/p3.incmd;n?i,roched the workplan drawings(10),2 of 11 dated 10M.3 of 11 dam rvvised 2114101 4-a&10-11 or 11 all dated revised 2I03&9 of 11 dated revised 2/17103. This permit,issued on November 13,2003 , is subject to complian with the application(where consiateat with the permit), all applicable regulations,special conditions and notes set forth below. Any violation of these terms may he subject to fines, imprisonment or civil action; or may cause the permit to be null and void, 1) This amended Major Modification authorizes the construction of an additional boat ramp, a retaining wall, a walkway around the previously permitted marina basin, lot reconfiguration, changes in street alignments,four (4) new road crossings in Section 4G4 wetlands, and four shared docking facilities along the shoreline west of the marina basin. All work authorized by this Major Modification shall be performed as expressly and specifically set forth in the permit application, unless modified berein. Shared Pier Facilities 2) This amended Major Modification:authorizes the four shared docking facilities,and other structures located in or over the water that are expressly and 'specifically set forth in the permit application. No other structure, whether floating or stationary,may becotrte a permanent parr of these shared docking facilities without permit modification. No non-water dependent uses of structures may be conducted on,in or over public trust waters without permit modification. (See attached sheets for Additional Conditions) This permit action may be appealed by the permittx or Signed by the authority of the Secretary of DENR and the other qualified persons within twenty (20) days of the issuing Chairman of the Coastal Resources Commission, date. An appeal requires resoltdion prior in work initiation or continuance as the case may be. This permit rnusr be accessible on-site Department p�•sonnel when the project is irtspecred for compliance. iance. onna D.Moffitt, Director Any mr requires work D project modification not covered Division of Coastal Management hereunder requires further Division approval. Bement All work must cease when die permit expires on This permit and its conditions are beroby accepted. December 31, 2004 In issuing this permit, the State of North Carolina agrees Char your project is consistent with the North Carolina Coastal Management program. Signature ofPermittee �7 ,Tn I,- I nann7r.H. Te QC-an o0n7/nTi0n NOV, -14' 0 3 �FRH 08 45 OEHNR COSTAL MGMT TEL 919 735 1495 P. 003 Coastal Communities,Inc. Permit#s-Ol Page 2 of 7 ADDITIONAL CONDTTTONS 3) No portion of any structure will be located within 80 feet of the near bottom edge federally maintained channel of the ATWW_ An as-built survey will be performed on the shared docking facilities u completion of the construction of these Pon structures and submitted to the Division of Coastal Management and tiva U.S. Army Corps of Engineers Wilmington Regulatory Field Office. 4) This amended Major Modification authorizes 2 slips par shared pier facility. At no time shall more than 2 vessels be moored or docked at each shared docking facility. The restriction of the number of vessels shall apply to all marine vessel types, including but not limited to motorboats, sailing vessels and personal watercraft. 5) Any portion of the permitted access piers built over coastal wetlands must not exceed six feet in width and must be elevated a minimum of three feet over the wetland substrate as measured from the bottom of the decking. 6) The authorized gazebos shall not be enclosed. Any materiel used on the sides shall not obstruct view and must he permeable to air and water. Screen or wire on the sides along with benches and knee wails am petrr i ned. 7) The roofs of the gazebos shall not be designed for second story use. 8) The pernuittee must install and maintain at his expense any signal lights or signals prescribed by the US. Coast Guard, through regulation or otherwise, on the authorized facilities. 9) It is possible that the authorized structures may be damaged by wavewash from passing vessels. The issuance of this permit does not relieve the pertnittec from taking all proper steps to ensure the integrity Of the permitted structure. The permittee will not hold the United States or the state of North Carolina liable for any such damage, Subdivision Developunent 10) This Major Modification authorizes the construction of the roads and installation of culverts as expressly and specifically set forth in the permit application and depicted on the attached workplan drawings except as modified herein. 11) Culvert inverts within wetlands shall be set at least one foot below normal bed elevation. 12) The culverts required for this project shall be installed in such a manner that the Original stream profiles are not altered. Existing stream dimensions (including the cross section dimensions, patter, and longitudinal profile) are to be maintained above and below the locations of each culvert. The culverts shall be designed and installed to allow for aquatic life movament as well as to prevent head cutting of the eaeams, If any of the existing pipes are or become perched, the appropriate stream guade shall be re• established or, if the pipes are installed in a parched manner, the pipes shall be removed and re-installed correctly. 13) Appropriate bedding material must be placed beneath the culverts to prevent structural subsidence. .o ion �,.,,,� �LnLa�nMl.lt-I�nIrt1.�H1 nRnn7Gbn TR R4:Rn 9RR7/b1/99 NOV. 14' 03(ERII 08:47 DEHNR COSTAL MGMT TEL:919 733 1415 P. 006 .. -- '-- Permit#5.01 NOV. -1413(PRI) 09:46 DEHNR COSTAL MGMT TEL:919 733 1495 P. 004 Coasted Can muntties, Inc Permit#5-01 Page 3 of 7 ADDITIONAL CONDITIONS 14) This Major Modification does not authorize any excavation other than that necessary to set the culverts, 15) The fill material for the permitted roadways will be clean and free of any pollutants except in trace quantities, and all fill material will be obtained from a high ground source and confined by an appropriate erosion control device until the material is sufficiently stabilized 16) The placement of fill material and culverts for all road crossings will not restrict surface flows into and out of any wetland areas. 17) No vegetated wetlands will be excavated or filled outside of the alignment of the fill area indicated on the workplan drawings. 18) No excavated or fill material will be placed at any time in any vegetated wetlands or surrounding waters ourside.of the alignment of the fill area indicated on the workplan drawings. 19) The temporary placement or double handling of excavated or fill materials within waters or vegetated wetlands is not authorized. 70) The fill material will be clean and free of any pollutants except in trace quantities. 21) All fill material will be obtained from a high ground source and confined behind appropriate erosion control devices. 22) Any development or land disturbing activities on single family lots conducted within 75 feet of the normal high water line will require the submittal and review of an application under the Minor Permit process through Brunswick County. 23) Any development or land disturbing activity that is considered non-water dependent is not authorized within 30 feet of the normal high water level unless specifically exempted by Coastal Resource Commission (CRC)regulations in place at the time of such development. 24) This Major Modification does not authorize the grading of individual lots. 'NOTE: The perminee is informed that policy 8.3.17 of the 1977 Brunswick County Land Use Plan Update encourages the preservation of tree cover and the use of native plants in landscaping. Retainine Wall 25) The alignment of the permitted retaining wall must be approved by a representative of the Division of Coastal Management prior to the start of any construction. 26) The retaining wail around the basin area shall be constructed as expressly and specifically set forth in the pemvt application and depicted on the attached workplan drawings. 27) Stotmwater runoff shall nor be increased by the installation of the retaining wall and the associated landscaping activities POQQ7obMT0. nz:An gnC17/bT/Q61 NOV. -14- U3(YKI) 08:47 DEHNR COSTAL WIT TEL 919 733 1495 P. 001 Coastal Communities,Inc. Permit*5.01 Page 6 of 7 ADDITIONAL CONDITIONS altoW Resources 49) If there are any structures more than 50 years old on or adjacent to the Project site, the e sand photographs of each such struct:rro to the NC be p p rtrrittee shay Preservation office (SBPO), These photographs shall pbearlaeyed to alma dural � iearly shows the site I°canon. If structures over SO years old are not found on or adjacent the project site, the permittee shall notify the SHPO in writing. Compliance with this condition shall be carried out to the satisfaction of SHPO prior to the initiation of any construction activities, General 50) The permittee shall record permanent, restrictive covenants on all lots in Phases 11 and III of Seascape Subdivision, preventing the placement of any fill material at any time, including temporarily, in any water or wetlands subject to US Army Corps of Engineers' (USAGE)regulatory jurisdiction. All work outside of the footprint of the permitted activities, inc]uding the construction of roads and the placement Of utility lines, will avoid impacts to 404 wetlands to the maximum ex on Practicable, Unavoidable modification of this peit, impacts to 404 wetlands will be minimized to the maximum extent practicable, and will require rm 51) This Major Modification changes Condition No. 49 of the original of LAMA Major Permit 5-01 to read as follows: "The permiucc shall record restrictive covenants that restrict the number of individual piers or docks as f(Illows: A) For the 16 eastern waterfront lots labeled 339 through 352 and 382 and 383, tho restrictive covenants shall require the use of shared piers limiting the total number of piers in this area to 8. B) On the western waterfront, the restrictive covenants shall require the use of shared piers and limiting the total number of piers in this area to 9." 52) The perminee will properly record the restrictive covenants that are acceptable to the USri Engineer, with the Brunswick County Register of Deeds so that they appear in the ch AGE Dain of tide for eistachct bed property prior to the sale of any lots within the Seascape at Holden Beach plantation descri subdivon. These covenants shall be recorded within 30 days of receipt of this be provided to the USACE and the Division of Coastal Management. permit and a copy shall 53) No attempt will be made by the purninee to prevent the free and full use by the public of all navigable waters at or adjacent to the authorized work. Use of the permitted activity must not interfere with the Public's tight to free navigation on all navigable waters of the United States. 54). The authorized structure and associated activity must not cause an unacceptable interference with navigation. 55) No excavated or fill material will be placed in any location or in any manner so as to impair surface water flow into or out of any wetland area. fllln7ChMTG 11:11 OQQ]./bT/qP NOV. -14' 03iFR1) 08:47 VEHNR COSTAL MGMT TEL:919 733 1495 P. 008 Coastal Communities,Inc. Pettnit#5-01 Page 7 of 7 ADDITIONAL. CONDMONS 56) The permittee will maintain the authorized work in good condition and in conformance with the terms and conditions of this permit. The permittee is not relieved of this requirement if he abandons the permitted activity without having it transferred to a third party, 57) The permitted activities will be conducted in such a manner as to prevent a significant increase in turbidity outside of the area of construction or consLmetion-related discharge. Increases such that the turbidity in the waterbody is 25 NTU's or less in all saltwater classes are not considered significant. 58) The permittee understands and agrees that, if future operations by the United States requires the removal, relocation, or other alteration of the structure or work authorized by this permit, or if in the opinion of the Secretary of the Army or his authorized representative, said structure or work shall cause unreasonable obstnrction to free navigation of the navigable waters, the pennince will be required upon due notice from the Corps of Engineers, to remove relocate or alter the structural work or obstructions caused thereby, without expanse to the United Stares or the state of North Carolina. No claim shall be [Wade against the United States of the state of North Carolina on account of any such removal or alteration. 59) Unless specifically altered herein, the perminee shall comply with any environmental commitment set out in the associated environmental document,regardless of whether such commitments are specifically set out in this permit. 60) This amended Major Modification must be attached to the original of Permit No.5-01, which was issued on 2/5/01, as well as the Major Modification which was issued on 8/28/03, and aU documents must be. readily available on site when a Division representative inspects the project for compliance. 61) All conditions and stipulations of the active permit remain in force under this Major Modification unless altered berein. NOTE: The construction and/or operation of the authorized development and facilities shall not directly result in any closure of any waters that are open to the taking of shellfish. Any such closure directly attributable to the permitted project will require that the permittee take remedial actions ro remedy the situation. Such actions may include, but are not limited to, a removal of any unauthorized slips or mitigative measures to reduce or eliminate the cause(s) of the closure NOTE: This permit does not eliminate the need to obtain any additional state, federal or local permits, approvals or authorizations that maybe required. NOTE: Future development of the permittee's property may require a modification of this permit. Contact a representative of the Division at (910) 395-3900 prior to the commencement of any such activity for this determination. NOTE: The U.S. Army Carps of Engineers has assigned the proposed project COE Action Id, No. 200001599. T[ or[o,� O!M7/Milan CA4M Permit 95-01 Major Modification Request Revised 4.2003 from its original alignment in the PUD in order to cross less wetland area Crossing# 1 is located at a historic wetland crossing and the requested wetland fill would widen the existing crossing. In addition, the fill width of the road will narrow from a 60' width on the uplands to a 35'-wide or 45'-wide at the wetland crossings. All proposed wetland unpaets are located outside the 75' Coastal Shoreline AEC. The wetland impacts requested with this modification are: Road Crossing# 1 3,298 ftZ Road Crossing #2 5,618 ftr Road Crossing # 3 5,533 ft'' Road Crossing# 4 1,428 ft= (see Sheets 3 &4) Previously Permitted Wetland lrnngcts(please refer to Sheet 3) A Nationwide 14 and a 401 Water Quality Certification were issued in 2000 for road development witbm Phase I. A Nationwide 18 and a 401 Water Quality Certification were also issued in 2000 for water control structures and other stormwater management features in Phases I and II. These permits were requested and approved prior to issuance of the CAMA Major permit due to planning and development sequencing. The CAMA permit(95-01) issued on 21V2001 authorized wetland impacts associated with (1) the marina entrance channel cut(2)a road within Phase I which could not be permitted by the earlier Nationwide 14 and(3) a road within Phase U. Impacts associated with the road crossing in Phase fI have since been avoided by revising the road alignment. It is requested that this reduction in impact area be noted as part of this modification so that permitted cumulative impacts will reflect actual impacts. Proposed mitigation(see Tables 1 & 2) Wetland impacts in Phases I and 11 total 037-acres. The impacts requested for roads in Phase M will bring the cumulative total to 0.73-acres. This total exceeds the US Army Corps of Engineers' threshold for compensatory mitigation(0.50-arse) but does not exceed the NC Division of Water Quality's threshold for compensatory mitigation(1.0-acre). Compensatory mitigation to satisfy the Corps' requirement is offered through a combination of restoration and preservation. Restoration options do not exist on-site, and the purchase of restoration credits through payment to the NC Wetlands Restoration Program is requeste& Coastal marsh loss associated with the marina entrance channel was offset through mitigation agreed upon with federal agencies during the review of the CAMA Major permit. Mitigation for this impact was satisfied through(1) the up-sizing of an existing culvert under Stone Chimney Road to improve flushing to coastal marsh and(2) through the limitation of the numbers individual piers on the property's shoreline. These mitigation efforts are outlined in conditions 42 &449 of the CAMA permit. With the submittal of this permit modification request, mitigation for currently requested impacts to riparian and headwater wetlands is offered. Riparian wetlands have been defined as those wetlands witbin300' of stream, as shown on the USGS topographic map. c:Iprojectstseascape modificationWa rarrve revised doc 2 nann7r.Hn Tc OC told OPn7/nT/QP CAAL4 Permit 0-01 Major Modification Request Revised 4.2003 Table 1 outlines riparian and non-riparian wetland impacts currently requested and the offered restoration Table 2 quantifies the preservation area offered through conservation of wetland areas within lots in Phase M. The preservation area would total approximately 9.58- acres and would represent an overall 26:1 preservation ratio (riparian and non-riparian combined). It is noted that wetlands within the lots in Phase II have already been preserved through condition 448 of the CAMA permit. Item 3. Residential Piers, Western 'Waterfroat. The number of piers along Seascape's western shoreline is limited through restrictive covenants to a total of nine piers. This limitation was required by condition#49 of the CAMA permit as partial mitigation for salt marsh loss at the marina's entrance cut. In order to immediately comply with the permit condition before lots were recorded, a Declaration of Restrictive Covenant was prepared which references lengths of shoreline and states the number of piers allowed each shoreline section. A length of shoreline along the eastern waterfront is referenced and a length of shoreline along the western waterfront is referenced. Language in the restrictive covenant states the referenced western shoreline may have a total of nine piers. Copies of that recorded Declaration of Restrictive Covenant and the associated map for the western waterfront(Map Cabinet 21,Page 99) are enclosed. Approximately half of the western waterfront lots are currently recorded. A Declaration of Shared Walkway and Pier Basement dictates where four piers may be constructed on this portion of the shoreline. A copy of that document and associated map are enclosed- Recorded lots on the western waterfront that are not allowed piers do not extend to mean high water. This restriction is also outlined in a Declaration of Protective Covenants and Easements, copy enclosed. Authorization to construct four of the western waterfront piers along the recorded alignments is now requested. Each of the four piers will exceed 4007 in length. Since a uniform design will be required by the subdivision, it is possible to request the structures as a modification of the subdivision's permit. This would allow all tour piers/docks to be reviewed at once, rather than through four separate CAb4A Major applications. The currently requested piers would serve eight lots, with every two lots sharing a pier. Specifically the proposed piers are: (1) a pier to be shared between lots 283 &282 (2) a pier to be shared between lots 281 &280(3) a pier between lots 279 & 278 and(4) a pier between lots 277 & 276. Details of the proposed piers have been provided by the project's land planner and shows all necessary dimensions (Sheets 8-11). It is noted that Phase I and the majority of Phase II have been recorded_ A current master plan is enclosed and shows the limit of currently recorded areas. Also included for DCM files are copies of the record plats for all waterfront areas in Phases I and II. c:Iprojects!sewcape modifxationl=rrame revised doc 3 T> rn �nn� 2gAA7gtPTF, PC; :RA C30AZ/b1/99 CAM Permit#5-01 Major 11fadifcationRequest 6 Revised 4.2003 G Table 2. Wetland Preservation within Phase IQ, Total Wetland Mitigation Ratio Preservation Preservation:Impacts Preservation Area for all wetland types within Phase III 6 U ti G 5 Wetlands within lots in Phase III to be 9.58-acres 9.58 : 0.36 placed in conservation via deed or restriction, restrictive covenants, or 26:1 similar mechanism(with allowance for temporary trench and back-All associated with utilities installation). r x 1 C 1 T C n 1 I r r caprojects4xeascape madifienfionliramrtive revised due 5 c n t Form DCM-MP-1 APPLICATION (To be completed by all applicants) c.. Street address or secondary road number. 1. APPLICANT Stone Chimney Road d. Is proposed work within city limits or planning a Landowner: jurisdiction? Yes X No Name. Seascape at Iioldem Plantation, lnc. e. Name of body of water nearest project(e.g. Address 3710 Stone Chimney Road river, creek, sound, bay) City Supply State NC Atlantic Intracoastal Waterwav Zip 28462 Day Phone 910.846.1000 Fax 910.842.4945 3. DESCRIPTION AND PLANNED USE OF PROPOSED PROJECT b. Authorized Agent: a_ List all development activities you propose Name Land Manaeemeot Group Inc. (e.g.building a home, motel, marina, bulkhead, pier,And 'excavation and/or filling activities. Address P.O.Box 2522 This modification requests additional City Wilmington State NC work within the currently 2arntitted Seascape subdivision. Please see attached narrative for Zip 28402 Day Phone 910.452.0001 specific activities. Fax 910.452.0060 b_ Is the proposed activity maintenance of an existing project,new work,or both? c. Project name(if any) New work within previously permitted subdivision, modification of CAMA Seascape at Holden Plantation, lnc. permit#5-0 1. -MOTZ Permit umT be issued in name of 4md&wner(s),and/or yroject name. c. Will the project bo for public, private or commercial use? Commercial 2. LOCATION OF PROPOSER d. Give a brief description of purpose, use, PROJECT methods of construction and daily operations of. proposed project. If more space is needed, please a. County Brunswick attach additional pages. Purpose of currently requested work is(1)to develop roads within Pbase b. City,town, community or landmark III of the subdivision (2) to construct four of the Varnumtown area nine allowed residential piers on the western Revised 03/95 .v rcn 11.+_� ac fan aMazini/qP Form DC141-MP-1 Conducted by Atlantic Archaeological Research, management summary provided in EA. _waterfront and (3) to modify asnects of the previously permitted community marina- k. Is the project located in a National Registered Historic District or does it involve a National Register listed or eligible property? 4. LA_h1D AND WATER _ Yes _X_No CHARACTERISTICS a. Size of entire tract total Seasca a tract is I- Are there wetlands on the she? X Yes No 502 acres. Phase III is roughly 146-acres Coastal(marsh) X Other X If yes, has a delineation been conducted? Yes b. Size of individual lot(s) X= 17, 000 ft2 (Anuch dacwn=MMw,if available) m. Describe existing wastewater treatment c. Approximaie elevation of tract above MHW facilities. or NWL 10'to'24'MLW County and state-approved wastewater d. Soil type(s) and texture(s)of tract Wando treatment systems fine sand on uplands,wet Leon sand and Dorovan muck in freshwater wetlands. Carteret n. Describe location and type of discharges to sands in marsh. watars of the state. (For example,surface nmo$ Sanitary wastewater, industrial/commercial e. Vegetation on tract S. alternir7ora and J effluent,"wash down"and resideatial discharges.) roemerianus in marsh. puercus spp. and Pinus No direct discharges are planned taeda dominant on uplands (see Environmental Stormwater run-off to be handled per the state- Assessment for more details), approved stormwater management plan. f. Man-made features now on tract Subdivision construction is complete or nearly o. Describe existing drittking water supply source. complete in phases 1 and ff. Some vegetation has County system bean mowed within Phase III. It is noted that a historic wetland crossing is located at the proposed Crossing# 1. 5. ADDITIONAL INFORMATION g. What is the CAMA Land Use Plan land classification of the site?tea vu ha4a"4aalam,l q In addition to the completed application form, the X Conservation(w/i _X Transitional following items must be submitted: Developed wetlands) W Community Rural _Other * A ropy of the deed(with state application only) (area of Town and Village cluslen) or other instrument under which the applicant h. How is the tract zoned by local government? claims title to the affected properties. If the- R-7500.with County approved PUD plan applicant is not claiming to be the owner of said property,then forward a copy of the deed or other I- Is the proposed project consistent with the instrument under which the owner claims title, applicable zoning? X Yes No plus written permission from the owner to carry out the project. (4tmch inning wmplimled cunf7Wt<,iifapplicable) j. Has a professional archaeological assessment ` An accurate, dated work plat(including plan been done for the tract?_X_Yes -No view and cross-sectional drawings)drawn to scale Revised 03/95 Tv ,nT 11,-,_i RC:AR PRR7./bT/9n Form DCM-NIP-1 Cent (PUD Phase 1) in black ink on an 8%a"by 1 I"white paper. (Refer Sedimuntation and Erosion Control Plan, to Coastal Resources Commission Rule 71.0203 permit # 990830BR (PUD Phases I&11) for a detailed description.) Plcasi now that original Stormwater IManagement Plan: SW 8990913 drawings are preferred and only high quality copies (P UD Phases I&LI) will be accepted. Blue-line prints or other larger plats are acceptable)only if an adequate number of Sedimentation and Erosion Control Plan4 quality copies are provided by applicant. (Contact permit #BR-01282 (PUD Phase Lln the U.S. Army Corps of Engineers regarding that agency's use of larger drawings.) A site or Stormwater Management Plan: SW 8010206 location map is a part of plat raquirctnents and it (PUD Phase n7) must be sufficiently detailed to guide agency personnel unfamiliar with the area to the site. CAMA Major permit # 5-01, associated Corps Include highway or secondary road(SR)numbers, Action IA number 20001599 (PUD Phases 1&11) landmarks, and the like. NW 12/18 and associated 401 Certification for *A Stormwater Certification,if one is necessary. installation of stormwater management and flood control features, Corps Action ID number *A list of the names and complete addresses of 20001578. (PUD Phases 1&L0 the adjacent waterfront (riparian) Landowners and signed return receipts as proof that such * A check for S400 made payable to the owners have received a copy of the application Department of Environment, Health, and Natural and plats by certified mail Such landowners Resources (DLc1-NPQ to cover the costs of must be advised that they have 30 days in which to processing the application. submit comments on the proposed project to the Division of Coastal Management. Upon signing * A signed AEC hazard notice for projects in this form,the applicant further certifies that such oceanfront and inlet areas. notice has been provided. * A statement of compliance with the N.C. (adjacent landowner at vwmern limit of Phase LLl) Environmental Policy Act(N.C.G.S.113A-1 to . Name Kenneth and Amy Gray 10) If the project involves the expenditure of Address 982 Bevar Road SW public funds or use of public lands, attach a Supply,NC 28462 statement documenting compliance with the North Carolina Environmental Policy Act. (Lot 352, Seascape&farina Village, eastern neighbor to manna entrance channel) Name Jim and Kathleen Dalton 6. CERTMCATION AND PERbISSION Address 1470 Anderson Avenue TO ENTER ON LAND Fort Lee,New Jersev 07024 I understand that any permit issued in response to * A list of previous state or federal permits this application will allow only the development issued for work on the project tract. Include permit described in the applicariom The project will be numbers, permittee, and issuing dates. subject to conditions and restrictions contained in the permit. Wetland road crossings: ACOENW# 14(Acrion 1D 200000281)and NC DWO 401 Water Ouality I certify that to the bcst of my knowledge, the Revised 03195 T7/TT 7nHJ I AIMIAJ=HAIHIAIrtKl". 1 MgMM7.Ct Gi TP RC :RI QCM7 IbT/Ql Form DCM-MP-1 proposed activity complies with the State of North Carolina's approved Coastal Management Progam and will be conducted in a marmer consistent with such program. I certify that I am authorized to grant, and do in fact, grant permission to representatives of state and federal review agencies to enter on the aforementioned lands in connection with evaluating information related to this permit application and follow-up monitoring of the project I further certify that the information provided in this application is truthful to the best of my knowledge. This is the �ay of PrintName AVOA Sr& 'A(H, CA*.09JtrJf V"a v^" Signature � m ner o athori..d Agertt Please indicate attachments pertaining to your proposed project. DCM MP-2 Excavation and Fill Information DCM MP-3 Upland Development DCM MP4 Structures Information DCM MP-5 Bridges and Culverts DCM MP-6 Marina Development NOTE.Please sign and date each attachment in the space provided at the bottom of each form. Revised 03i9S nann7C�nTG RC:Pn O907/hT/Ql i Form DC—M MAP-2 EXCAVATION AND FILL (Except bridges and culverts) Attach this form to Joint Application for CALMA Major Permit, Form DCM-MP-1. Be sure to 1. EXCAVATION complete all other sections of the Joint Application N/A that relate to this proposed project. a. Amount ofmaterialto be excavated frol a below MHW or NWL in cubic yards Describe belowthepurposeofproposedexcavation or fill activities. All values to be given in feet. b. Type of material to be excavated Average final Existing Project L=M Width Deoth Dcoth c. Does the area to be excavated in.0 Coastal Access channel NIA wetlands (marsh), subtnerged aquatic v *etation (MI.W) h (SAVs) or other wetlands? Yes No (�L) d. liighground excavation ht cubic yards NIA Canal N/A 2. DISPOSAT.. OF]EXCAVATED Boat N ATERIAL Basin N/A N/A a. Location of disposal area Boat b. Dnnensions of disposal area NIA Rock Groin c. Do you claim title to disposal area Yes —No NIA if no, attach a letter pe i Rock grantingsion from Breakwatcr the owner. Other(Exdudiog RLL FM J4ft d Will a disposal area be available for future shoreliac C sS maintenance? Yes No stabiliz- -- If yes, where? Please see attached narrative and Shed 4 Revised 03)95 fn0nn7CbPTC QC:Qia QbIAZ/hT/QR i Form DCM-MY-2 water N ne (2) Dimensions of fill area e. Dots the disposal area in-ludo any coastal (3)Purpose of fill wetlands (marsh), SAVs or oth r wetlands? Yes —No b. Will fill material be placed in coastal wetlands (marsh), SAVs or other wetlands? f. Does the disposal include any rea in the water? X Yes No —Yes `No If yes, (1)Dimensions of fill area Crossing# 1: roughly 40'x 150' 3. SHORELINE STABILIZATION Crosses #2: roughly 45'x 125' Crossing# 3: roughly 45' x l l5' a. Type of shoreline stabilization N/A Crossing#4: roughly 35'x 40' Bulkhead Riprap (2) Purpose of fill To construct subdivision roads to provide access to upland areas which are b. Length disconnected by branches of the wetland system. These areas have no other upland access. c. Average distancewaterward ofb1HW i rNWT- S. GENERAL d. Maximum distance waterward of Iv HW or a. How will excavated or fill material be kept on NW, site and erosion controlled? per measures in state-approved sedimentation and erosion control elan e. Shoreline erosion during preceding 1.2 Ronths b. What type of construction equipment will be used(for example,dragline,backhoe, or hydraulic dredge)? f. Type of bulkhead or riprap material dumb uck.backhoe c- Will wetlands be crossed in transporting g- Amount of fill in cubic yards to b placed equipment to project site? '_Yes _No below water level If yes, explain steps that will be taken to lessen (i)Riprap environmental impacts. Proposed wetland impacts would provide (_)Bulkhead backSll permanent crossings necessary to access upland areas of project. h. Type of fill material i. Source of fill material AA 4. OTHER FML ACTIVITIES Applicant or Project Name xcluding Shoreline Stabilixatiou) (E S e" ���ia lt a. Will till material be brought to site. X Yes No 6�t2 2,11 3 If yes, all to (1) Amount of material to be placed in the Revised 03195 __ .. � �.... •i�.r-vu. uianuu� o n9Gen T[ OC:QQ Qnn7/bT /QL7 Form DCM,IMP-3 UPLAND DEVELOPMENT (Construction and/or land disturbing activities) Attach this form to Joint Application for CAMA ofMHW or NWL,or within 575 feet in the case of Major Permit, For DCM-Mp-I_ Be sure to an Outstanding Resource Water,to be covered by complete all other sections of the Joint Application impervious and/or built-upon surfaces, such as that relate to this proposed project. pavement, buildings, rooftops, or to be used for vehicular driveways or parking. Less than 1%. a. Type and number of buildings, facilities, units The only impervious cover within the coastal or structures proposed No buildings are shoreline AEC may be the driveway needed to currently planned within Phase III(clubhouse. access planned lot 545, depending on the final marina offices. other amenities are in Phases I permitted alignment. This would represent less & III. than 10% of the total ABC area- b. Number of lots or parcels It Projects that require a CAMA Major 124 un-recorded residential lots are curreully Development Permit may also require a planned within Phase M. (I I residential lots Stormwater Certification. Has a site development within Phase ffI are already recorded). plan been submitted to the Division of Environmental Management for review? c. Density (give the number of residential units X Yes No and the units per acre) If yes, date submitted +/- 146-acres within Phase III, submitted by Cape Fear Engineering permit rou¢ltiv 0.9 units/acre 4S W 8010106 d. Sizc of area to be graded, filled or disturbed i. Describe proposed method of sewage disposal. including roads,ditches, etc. individual wastewater treatment systems approx. 53 acres within Phase III j. Have the facilities described in Item f. above e. If the proposed project will disturb more than received state or local approval? County and one acre of land, the Division of Land Resources state approval is being obtained concurrent with must receive an erosion and sedimentation control this modification request. plan at least 30 days before land disturbing activity (Attach approptiate documentation) begins. If applicable, has a sedimentation and erosion control plan been submitted to the Division k. Describe location and type of proposed of Land Resources? X Yes No discharged to waters of the state (for example, If yes, date submitted submitted by Cape surface runoff, sanitary wastewater, Fear Engineering hermit BR-012A2 industriallcotmuercial etfIuent,""wash down" and residential discharges). f. List the materials (such as marl, paver stone, No direct discharges are planned. Run-off asphalt,or concrete)to be used for paved surfaces. to be handled per conditions of the state-approved Primarily asphalt, may also include some low density stormwaicr management plan. marl and/or stone. Give the percentage of the tract within 75 feet Revised 03195 On-an onn> /bT/on Form DCM-MR3 1. Describe proposed drinldng water supply source (e.g. well, community, public system etc.) community systetn M. Will water be impounded?_Yes X No If yes,how many acres? n. If the project is an oceanfront development, when was the lot(s) platted and recorded? N/A �1rc�� ��x>�nartl Applicant o Project a lue tit 14 A�'Lad'6 S^ Date Revised 03l95 nonn7rhn Tc Or. 1On Onn7 /bT/OQ i Form DC1V1:MP4 STRUCTURES (Construction within Public Trust Areas) Attach this form to Joint Application for CAMA (9) Width of water body 460' Major Permit, Form DCM-MP-1. .Be sure to (10)Water depth at waterward end of pier at complete all other sections of the Joint Application ML W or NWL average-3.7' ML W, which rdacc to this proposed project. Please see Sheets 6 & 7. a. Dock(s)and/or Pier(s) 4 shared piers to serve b. Boathouse(including covered lifts) N/A lots 276-283, every two lots sharing a pier, (1) Commercial Private (1)_Commercial_Community X Private (2) Length (2)Number 4 shared piers (3) Width (3)Length Pier. lots 276 &277= 565' Pier, lots 278 & 279 = 635' c. Groin(e.g. wood, sheetpile, etc.) /A Pier, lots 280&281 = $20' (1)Number Pier, lots 282 &283 = 585' (2)Length(s) Fixed dock or"t"at end of all four piers= 30' Nate: Lengths offloating docks on either side of d. Breakwater(e.g. wood, sheetpile,etc.) NIA shared pier and feed "r" vary for each lot (1)Length Please see Sheets 8-11. (2) Average distance from MH�W,NWL or (4) Width All four piers= 6' wetlands Fixed dock or"t"at end of three viers (3) Maximum distance beyond MHW,NYLI serving lots 276 thru 291 = 8' or wetlands Fixed dock or"e' at end of pier serving lots 282 &283 = 10' e. Mooring buoys N/A Note: Widths of floaiing docks on either side of (1)_ _Commercial _Com rmm _Private shared pier and fixed "t" vary for each lot. (2)Number Please see Sheets 8-11. (3)Description of buoy (5)Finger Piers X Yes_No (Color, inscription, size, ane r, etc.) (i) Number 8. or one ner slip (ii) Length(iii) Width (4)Width of water body Note: Finger pier dimensions on either side of (5) Distance buoy(s)w be placed eyomd shared pier and fixed "r" vary for each lot. shoreline Please see Sheers 8-11. (6)Platform(s) X Yes_No f. Mooring structure (boatlift, mooring pilings, (i) Number 8 gazebos. or 1 per lot. etc.) Additional floating platforms for lots (1)_Commercial_Community X Private 277.282, &283 (2)Number eight boat lifts total. (ii)Length (iii) Width_ or one per lot. Note. Gazebo size and other platform dimensions (3)LeniA 23'6" all eighL lifts) vary for each lot,please see Sheets 8-11. (4)Width 17' (all eight lifts) (7)Number of slips proposed 8 total (8)Proximity of structure to adjacent riparian g. Other(Give complete description) NIA property lines minimum of 20'. please see Sheets 5 & 6. -- .,+ �..0 i,i�id-in.+u,+idrtu+� nOnn]CfiOT[ ❑C[OQ Q[1Q] /nT/QG Form DCM42-5 or NWL? Yes X No If yes, NIA Crossing# 3: two 36" CMPs (1)Length of area to be excavated (2) Width of area to be excavated o. Type of culvert(construction material, style) (3)Depth of area to be excavated all culverts to be corrugated metal pipe(CMP) (4)Amount of material to be excava m cubic yards d Will proposed culvert replace an existing bridge? _Yes X No b. Will the placement of the proposed bridge or If yes, NIA culvert require any excavation within: N/A (1)Length of existing bridge Coastal Wetlands _ SAVs I Other (2) Width of existing bridge Wetlands If yes, (3)Navigation clearance undernea (1)Length of area to be excavated existing bridge (2)Width of area to be excavated (4) V M a!!, or apart of,the exis (3)Amount of material to be exca in bridge be removed? (Explain) cubic yards e. Will proposed culvert replace an existing c. Will the placement of the proposed bridge or culvert? X Yes No culvert require any higliground excavation? if yes, (existing culvert at Crossing#I only) Yes X No (1)Length of existing culvert 20' If yes NIA, (2)Width of existing culvert 18" (1)Length of area to be excavated (3)Height of the top of the existing culvert above the MHW or NWL N/A (2)Width of area to be excavated (4) WM all, or a part of,the existing (3) Amount of maierial to be excavated in culvert be removed?(Explain) to be cubic yards removed d. If the placement of the bridge or culvert f. Length of proposed culvert two 24" CM?s involves any excavation, please complete the 40 lft. each following: N/A (1)Location of the spoil disposal area f Cr Width of proposed culvert two 24" CMPs (2)Dimensions of spoil disposal area h. Height of the 'top of the proposed culvert above the MHW or 1dWL N/A- will be a ror (3)Do you claim title to the disposal IS" above wetland surface Yes No If_o, attach a letter graniing Pe ' sion L Will the proposed culvert affect existing water from the owner. flow'? Yes X No (4) Will the disposal area be availa le for L yes, explain future mai�i•�euaaoc?_Yes No (5) Does the disposal area include any coastal j.Will the proposed culvert affect existing wetlands (marsh), SAVs, or other navigation potential? Yes X No wetlands?�Yes No (No navigation potential exutx - only occasional Lf yes, give dimensions if differcOt from surface flow over wetland surface and nol at (2)above. navigable depths) (6) Does the disposal area include an' area below the IvIHW or NMI,? Yes_No 3_ 'EXCAVATION AND FILL e. Will the placement of the proposed bridge or a Will the placement of the proposed bridge or culvert result in any fill (other than excavated culvert require any excavation below the MHW material described in Item d. above) to be placed Revised 031" ..._..__........_...., .��.,.r nn•inn .nm I� T fora I Form DCM W-4 Applicant or Pr ject Name r Date onn> I�T ion .f Form DCM-TNIP-S BRIDGES AND CULVERTS Attach this form to Joint Application for CAMA g. Length of proposed bridge N/A Major Permit, Form DCM-MP-L Be sure to complete all other sections of the Joint Application h. Width of proposed bridge that relate to this proposed project. I. height of proposed brdge above ands 1. BRIDGES N/A j. Will the proposed bridge affect e g water a. Public Private flow? Yes No b. Typc of bridge(construction material) L Navigation clearance underneath proposed bridge c. Water body to be crossed by bridge L Will the proposed bridge affect naN'gation by reducing or increasing the existing navigable d. Water depth at the proposed crossing a MLW opening? Yes N or NWL if yes, explain e. Will proposed bridge replace an existing 1 ridge? m Will the proposed bridge cros wetlands Yes No containing no navigable waters?_Y _No Lf yes, If yes, expo (1)Length of existing bridge (2)Widffi of existing bridge n. Have you contacted the U.S. C last Guard (3)Navigation elea.-ance underneath -sting concerning their approval? _Yes No bridge If yes, please provide record of their action- (4)W ill all, or a part of the existing bridge be removed?(Explain) 2, CULVERTS f. Win proposed bridge replacc an c�isting culvert(s)?_Yes No a to be Culverts to be used at Crossings and 93) 7f.yes a. Wafer body in which culvert is to be placed (1)Length of existing culvert Crossing# 1:vegetated wetland area 1 Lengt of e culvert Crossing#2: veaetatod wetland area ( ) _istineo- Crossnge# 3: un-named blue line stream (3)Height of the top of the existing c vert above the lvff or NWL b. Number.of culverts proposed (4)Will all, or a part of the existing ert Crossing# 1: two 24" CMPs be removed? (Explain) Crossing it 2: two 24" CMPs Revised 03/95 QOn7/hT 10f Design Narrative and Supporting Calculations For SeaScape at Holden Plantation SW8 990913 Brunswick County, North Carolina Prepared for Coastal Communities, Inc. 131 Ocean Blvd. West Holden Beach,North Carolina 28462 (910) 842-4939 �„uuuuway. % �N CgRO���Gi a S AL Date: April, 2007 N�q�!S F� .o`• 111,nn„ma�• Prepared by Cape Fear Engineering, Inc. 151 Pole road, Suite 100 Belville, North Carolina 28451 (910) 383-1044 DESIGN NARRATIVE 1. GENERAL: The project site is located off of(SRI 119) Stone Chimney road approximately '/4 of a mile south of the Stone Chimney road and Sabbath Home road intersection within Brunswick County, North Carolina. This project site is approximately 496 acres. Drainage considerations are to be in accordance with DWQ stormwater requirements. The intent of this project is to develop streets, drainage improvements and a development office with parking. This development will support 550 single-family home sites. The impervious coverage has been kept to a minimum to promote infiltration as much as possible. These home sites will average 1/2 of an acre in area and limited to no more than 6,000 sq. ft. of built upon area per lot. 2. EXISTING SITE: Site topography in the area is relatively flat with slopes typically less than (2) percent. There are low areas throughout the site that drain to wetlands, which will provide positive drainage for the area to the Spring Creek and to the Atlantic Intracoastal Waterway. Vegetation consists primarily of grasses and minor ground cover within the area of the improvements. Subsurface soils are typically a mixture of sands, silty sands and organics. 3. PROPOSED IMPROVEMENTS: Improvements proposed include drainage devices, streets, utilities and a development office with parking. Drainage for the most part will sheet flow from the lots into the streets which will have curb and gutter to direct drainage to low points or curb outlets in the roads. Drainage at the low points in the streets will flow into trench drains and curb inlets which then outlet into vegetative swales that will be constructed with 5:1 side-slopes and a minimum length of 100 feet. In some instances in this project, once the storm water flows through the vegetative swales at the minimum design criteria, it will drop into an inlet box and be directed via subsurface pipe to an outlet source. This outlet source will be either a drainage ditch or the proposed marina basin. In the case of a pipe directed into the marina basin, the pipe will be set to an elevation so that the pipe will be below the marina basin water surface. The storm water that enters the proposed subsurface pipe will be treated prior to entering this conveyance pipe. The pipe lengths have been kept to a minimum and are needed only to convey treated storm water due to the topography limitations. Piping will be perforated and installed at relatively flat slopes to promote infiltration when possible. The soils are very sandy and ideal for infiltration. Design Narrative SeaScape at Holden Plantation Phase One Page 1 4. PROPOSED PERMIT MODIFICATIONS: In 2001, Permit SW8 990913 was issued for the first phase of development, and SW8 010206 was issued to cover the second phase of development. Permit modifications for both SW8 990913 and SW8 010206 were initiated some time ago, but were never completed. There are several main goals with this permit modification, the first being to complete the permit modifications. To simplify this process, we propose the combination of the two permits, SW8 990913 and SW8 010206. The'application er quests-modification-to-SW8 990913-to-includ th entire,project;arid=we fuithei request SW8"OL0206=be-rescinded Much of the Phase 2 portion of the project has been revised from what was permitted. The land plan is very similar, but there are changes to the roads, lots, drainage patterns, and water quality swales. To aid in the review of the drainage areas that have changed, an exhibit is included with the drawings that shows which areas have changed and which remain as permitted. The project area for the permit modifications is greater than the sum of the two previously issued permits due to the addition two new areas to the project. A new residential area has been added to the Phase I portion of the project (drainage areas ITT and 1SS). An additional area of future development has also been added with a projected impervious coverage (Phase 5). This-area.oEffiture development-will-6e-a-pocket-o ht igh density, V- Gwill:require and-engineered-sol- --ution,.and-will require a-future-permit-modification Additional permit-modifications-iriclude=tg&-additional-of=three-pockets-of-}iigh-density.—The three pockets=of high .density include four;engineered-solutions-for-ififilfrati6h,--and-design calculations-are-attached? These projects were approved with a combined total of 7,749 linear feet of piping. With this modification, the project included 7,519 linear feet of piping—a net reduction of 230 linear feet. The following attachments contain the required design calculations for the project. Design Narrative SeaScape at Holden Plantation Phase One Page 2 APR-26-2007 131=23 COASTAL DEVELLO ENT HB 9108423939 P.01i01 SKMTWE RESOLUTION OF SEASCAPE AT HOLDEN PLANTATION, INC. The UMWBVW.bein89 Iident of 1 9 tliat on the 2 6 of AAe .� remkillair RESOLVED,that the perms named below haw been deApated by ttre Presdant and are ernpoarered by the oorporslW to have nonexclusive signature auttotity for any federal,shft,or kW pemwehg In0uments as may be required for or on behae of the Seascape at Holden Pie,htatiorh,Inc. These persona shall have signature authority as authortzed herein for the seaScapa at Hoden Piantailon,Ina t g&Lewis And that said resobAon has not been mcliGed or resdnded. Qat@: 91f X-e/0 7 ma* ant Ise❑ P/a {b�, p04ATR, ph O •t: 7 m : TOTAL P.01