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HomeMy WebLinkAboutSW8140416_HISTORICAL FILE_20160715STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 I4 0 4 6 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE ? 016 07 1 S YYYYMMDD Energy, Mineral & Land Resources ENVIRONMENTAL QUALITY July 15, 2016 Mr. Michael Pollak, Manager Signaturc Top Sail NC, Ltd. LP & Signature Top Sail GP, LLC 9337 B Katy Freeway #377 Houston, TX 77024 PAT McCRORY Governer DONALD R. VAN DER VAART Secretary TRACY DAVIS Director Subject: State Stormwater Management Permit No. SW8 140416 Modification Wyndwater Phase 2 Iligh Density Subdivision Wet Detention Pond Project Pender County Dear Mr. Pollak: The Wilmington Regional Office received a complete, modified State Stormwater Management Permit Application for Wyndwater Phase 2 on June 28, 2016. 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 and Session Law 2008-211. We are forwarding modified Permit No. SW8 140416 dated July 15, 2016, for the construction, operation and maintenance of the BMP's and built -upon area associated with the subject project. This permit shall be effective from the date of issuance until July 3, 2022, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the conditions listed in this permit regarding the Operation and Maintenance of the BMP(s), recordation of deed restrictions, certification of the BMP's, procedures for changing ownership, transferring the permit, and renewing the permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system, to record deed restrictions, to certify the BN P's, to transfer the permit, or to renew the permit, will result in future compliance problems. The following modifications are included and covered by this permit: I. Overall impervious area and drainage area has increased. 2. Total number of lots has increased from 54 to 61. 3. Pond 1 has increased in volume. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing by filing a written petition with the Office of Administrative Hearings (OAH). The written petition must conform to Chapter 150B of the North Carolina General Statutes, and must be filed with the OAH within thirty (30) days of receipt of this permit. You should contact the OAH with all questions regarding the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. State of North Carolina I Environmental Quality I Energy, Mineral and Land Resources Wilmington Regional Office 1127 Cardinal Drive Extension I Wilmington. NC 28405 910 796 7215 State Stormwater Permit No. S W8 140416 MOD Page 2 of 2 If you have any questions, or need additional information, please contact Steve Pusey in the Wilmington Regional Office, at (910) 796-7215. Sincerely, Tracy avisLf , P.E., Director Division of Energy, Mineral and Land Resources GDS/sgp: \\\Stormwater\Permits & Projects\2014\140416 HD\2016 07 permit 140416 cc: Jennifer Pollak Evans, Registered Agent, Signature Top Sail NC, Ltd. 4307 Peeble Drive, Wilmington, NC 28412 Garry S. Pape, PE— GSP Consulting, PLLC Fender County Inspections Division of Coastal Management Wilmington Regional Office Stormwater File State of North Carolina I Environmental Quality I Energy, Mineral and Land Resources Wilmington Regional Office 1 127 Cardinal Drive Extension I Wilmington, NC 28405 910 796 7215 State Stormwater Management Systems Permit No. SW8 140416 MOD STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL AND LAND RESOURCES STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY SUBDIVISION DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Signature Top Sail NC Ltd. LP Wyndwater Phase 2 Sloop Point Road, Hampstead, Pender County FOR THE construction, operation and maintenance of one (1) wet detention pond in compliance with the provisions of 15A NCAC 2H .1000 and Session Law 2008-211 (hereafter referred to as the "stormwater rules') the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Energy, Mineral and Land Resources (hereafter referred to as the Division or DEMLR) and considered a part of this permit. This permit shall be effective from the date of issuance until July 3, 2022 and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. The subdivision is permitted for 61 lots, each limited to a maximum amount of built - upon area as indicated in Section 11.4 (f) of this permit. 3. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.8 of this permit. The runoff from all built -upon area within the permitted drainage area(s) of this project must be directed into the permitted stormwater control measure(s). The stormwater control measure has been designed to handle the runoff from 407,335 square feet of impervious area. 4. The maximum built -upon area allowed for the entire subdivision is 407,335 square feet. 5. The drainage area will be limited to the amount of built -upon area indicated in Sections 1.3 and 1.8 of this permit, and per approved plans. The built -upon area for the future development is limited to 60,300 square feet, which is included in the total amount listed above. Page 1 of 9 State Stormwater Management Systems Permit No. SW8 140416 MOD 6. A 50' wide vegetative buffer must be provided and maintained adjacent surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of both sides of streams and rivers and the mean high water line of tidal waters. 7. All runoff being directed into wetlands shall flow into and through those wetlands at a non -erosive velocity. 8. The following design criteria have been permitted for the wet detention pond and it must be provided and maintained at the design condition. Pond 1 a. Drainage Area, acres: Onsite, ftz: Offsite, ft2: 24.01 1.046,055 0 b. Total Impervious Surfaces, ftz: Onsite, ftz: Offsite, ftz: 407,335 0 c. Average Pond Design Depth, feet: 4.5 d. TSS Removal Efficiency: 90% e. Design Storm, inches: 1.5 f. Permanent Pool PP Elevation, FMSL: 20.5 g. Permitted PP Surface Area, ft : 33,673 h. Temporary Storage Elevation, FMSL: 21.84 i. Permitted Storage Volume, ft3: 52,492 j. Predevelopment 1 yr-24 hr. discharge rate, cfs: 0.95 k. Controlling Orifice, inch 0 pipe: 4.0 I. Orifice Flow Rate, cfs: 0.28 m. PP Volume, ft3: 138,674 n. Forebay Volume, ft3: 29.015 o. Maximum Fountain Horsepower: 1/2 p. Receiving Stream/River Basin: Mullet Run / Cape Fear 9. Stream Index Number: 18-87-9-1 r. Classification of Water Body: SA; HWQ over''/2 mile II. SCHEDULE OF COMPLIANCE No person or entity, including the permittee, shall alter any component of the approved stormwater system shown on the approved plans unless and until the Division has approved of the revised plan. 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. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. If the stormwater system is 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. 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 140416, as issued by the Division of Energy, Mineral and Land Resources 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. Page 2 of 9 State Stormwater Management Systems Permit No. SW8 140416 MOD 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 Division. e. Alteration of the drainage as shown on the approved plans may not take place without the concurrence of the Division. f. The maximum built -upon area per lot is as shown in the table below: Lot BUA (sf) Lot BUA (sf) 44 4500 75 4500 45 4500 76 4500 46 4500 77 4500 47 4500 78 4500 48 4500 79 4500 49 4500 80 4500 50 4500 81 4500 51 4500 82 4500 52 4500 83 4500 53 4500 84 4500 54 4500 85 3738 55 4500 86 3628 56 4500 87 3628 57 4500 88 3628 58 4500 89 3628 59 4500 90 3628 60 4500 91 3628 61 4500 92 4043 62 4500 93 3665 63 4500 94 3987 64 4500 95 3688 65 4500 96 3688 66 4500 97 3911 67 4500 98 3625 68 4500 99 3625 69 4500 100 3625 70 4500 101 3625 71 4500 102 3625 72 4500 103 3625 73 4500 104 3698 74 4500 Pond 1: Total BUA 258,436 sf 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. Page 3 of 9 State Stormwater Management Systems Permit No. SW8 140416 MOD g. 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 more restrictive of the two numbers. h. All runoff from the built -upon areas on the lot must drain into the permitted system. This may be accomplished through providing roof drain gutters, which drain to the pond or street, grading the lot to drain toward the street or directly into the pond, or grading perimeter swales and directing them into the pond or street. i. Built -upon area in excess of the permitted amount will require a permit modification. j. All affected lots shall maintain a 50' wide vegetative buffer adjacent to surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of each side of streams and rivers and the mean high water line of tidal waters. k. Any individual or entity found to be in noncompliance with the provisions of a stormwater management permit or the requirements of the Stormwater Rules is subject to enforcement procedures as set forth in G.S. 143, Article 21. 5. 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. 6. If permeable pavement BUA credit is desired, the permittee must submit a request to modify this permit to incorporate such language as required by the Division. The request to modify must include a proposed amendment to the deed restrictions and protective covenants for the subdivision, and a soils report identifying the type of soil, the Seasonal High Water Table elevation and the infiltration rate. Upon the successful completion of a permit modification, the individual lot owners that request to utilize permeable pavements shall submit the necessary forms and documentation to the permittee, or a designated agent, and receive approval prior to construction of the permeable pavement. The permittee shall review all lot plans for new construction and any subsequent modifications and additions, for compliance with the conditions of this permit. The permittee shall not approve any lot plans where the maximum allowed built -upon area has been exceeded, or where revisions to the grading or to the storm drainage system are proposed unless and until a permit modification has been approved by the Division. 8. The permittee is responsible for the routine monitoring of the project for compliance with the built -upon area limits, grading, and the storm drainage system established by this permit, the permit documents, the approved plans, and the recorded deed restrictions. The permittee shall notify any lot owner that is found to be in noncompliance with the conditions of this permit in writing, and shall require timely resolution. 9. The permittee shall at all times provide the operation and maintenance necessary to assure that all components of the permitted stormwater system function at design condition. The approved Operation and Maintenance Agreement is incorporated by reference into this permit and must be followed in its entirety and maintenance must occur at the scheduled intervals. 10. Records of maintenance activities must be kept and made available upon request to authorized personnel of the Division. The records will indicate the date, activity, name of person performing the work and what actions were taken. Page 4 of 9 State Stormwater Management Systems Permit No. SW8 140416 MOD 11. If the permanent pool volume is greater than 30,000 cubic feet, a decorative spray fountain will be allowed in the stormwater treatment system, subject to the following criteria: a. The fountain must draw its water from less than 2' below the permanent pool surface. b. Separated units, where the nozzle, pump and intake are connected by tubing, may be used only if they draw water from the surface in the deepest part of the pond. C. The falling water from the fountain must be centered in the pond, away from the shoreline. d. The maximum horsepower for the fountain's pump is based on the permanent pool volume. The maximum pump power for a fountain in this pond is 1/2 hp. 12. The facilities shall be constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 13. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, the permittee shall cause a certification from an appropriate designer for the system installed to be submitted, certifying that the: permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 14. All stormwater collection and treatment systems must be located in either public rights - of -way, dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such rights -of -way, common areas and easements, in accordance with the approved plans. Access to the stormwater facilities for inspection and maintenance shall be maintained via appropriate recorded easements at all times. 15. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Redesign or addition to the approved amount of built -upon area or to the drainage area. C. Further development, subdivision, acquisition, lease or sale of any, 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. d. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. e. The construction of any future BUA listed on the application. 16. Prior to transfer of the permit, the stormwater facilities will be inspected by Division personnel. The project and the stormwater facility must be in substantial compliance with all permit conditions. Any items not in substantial compliance must be repaired, replaced or restored to design condition prior to the transfer. Records of maintenance activities performed to date will be required. 17. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. Page 5 of 9 State Stormwater Management Systems Permit No. SW8 140416 MOD Ill. GENERAL CONDITIONS 1. Any individual or entity found to be in noncompliance with the provisions of a stormwater management permit or the Stormwater rules is subject to enforcement procedures as set forth in NCGS 143 Article 21. 2. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 3. In the event that the facilities fail to perform satisfactorily 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. Additional or replacement stormwater management systems shall receive a permit from the Division prior to construction. 4. This permit is not transferable to any person or entity except after notice to and approval by the Director. The permittee shall submit a completed and signed Name/Ownership Change Form, accompanied by the supporting documentation as listed on the form, to the Division of Energy, Mineral and Land Resources at least 60 days prior to any one or more of the following events: a. An ownership change including the sale or conveyance of the project area in whole or in part, except in the case of an individual lot sale that is made subject to the recorded deed restrictions; b. The sale or conveyance of the common areas to a Homeowner's or Property Owner's Association, subject to the requirements of Session Law 2011-256; C. Bankruptcy; d. Foreclosure, subject to the requirements of Session Law 2013-121; e. Dissolution of the partnership or corporate entity, subject to NCGS 57D-2-01(e) and NCGS 57D-6-07; f. A name change of the current permittee; g. A name change of the project; h. A mailing address change of the permittee; 5. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. Neither the sale of the project, in whole or in part, nor the conveyance of common area to a third party constitutes an approved transfer of the stormwater permit. 6. The permittee grants DEMLR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 7. The permit issued shall continue in force and effect until modified, revoked, terminated or renewed. 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. 8. Approved plans, calculations, supplement forms, operation and maintenance agreements and specifications for this project are incorporated by reference and are enforceable parts of the permit. A copy of the approved plans and specifications shall be maintained on file by the Permittee at all times. 9. Unless specified elsewhere, permanent seeding requirements for the stormwater control measure must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. Page 6 of 9 State Stormwater Management Systems Permit No. SW8 140416 MOD 10. 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 Session Law 2006-246, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et.al. 11. The permittee shall submit a permit renewal application request at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate application, documentation and the processing fee. Permit modified and reissued this the 15th day of July, 2016. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION ,�, i racy ugvis, r.c., uirector Division of Energy, Mineral and Land Resources By Authority of the Environmental Management Commission Permit Number SW8 140416 Page 7 of 9 7/152016 Corporations Division n' Click Here To: View Document Filings Corporate Names North Carolina Elaine F. Marshall DEPARTMENT OFTHE Secretary SECRETARY OF STATE PO Box 29622 Raleigh, NC 27626-0622 (919)807-2000 Home State: Signature Top Sail NC Ltd Legal: Signature Top Sail NC, Ltd. LP Limited Partnerships Information Sosld: Status: Annual Report Status: Citizenship: Date Formed: State oflncorporadon: Registered Agent: Corporate Addresses 1355606 Current -Active Foreign 12/9/2013 TX Evans, Jennifer Pollak Principal Office: 4307 Peeble Or Wilmington, NC 28412 Reg Office: 4307 Peeble Or Wilmington, NC 28412 Reg Mailing: 4307 Peeble Or Wilmington, NC 28412 Mailing: 9337 B Katy Freeway 377 Houston, TX 77024 Account Login Register 1\ ...:r,u � S. ,: :'�;0 r_. 11)r �)O din.. q:)T 'y,ul l:L �:)liJil. 7(Ii Ml ji 3UF.0.1,J :4 f2GG GfUC181:.P :fd:."n):Ua C]f.iS OVi ?4`1 X3 .no;aucH NORTH CAROLINA Department of The Secretary of State CERTIFICATE OF FOREIGN LIMITED PARTNERSHIP i I, ELAINE F. MARSHALL, Secretary of State of the State of North Carolina, do hereby certify that Signature Top Sail NC Ltd DBA Signature Top Sall NC, Ltd. LP a limited partnership organized under the laws of Texas, having filed on this date an application conforming to the requirements of the General Statutes of North Carolina, a copy of which is hereto attached, is hereby granted authority to transact business in the State of North Carolina. IN WITNESS WHEREOF, I have hereunto set my hand and affixed my official seal at the City of Raleigh, this 9th day of January, 2014 Secretary of State oowmemia c201336400123 '„ ��r. . c_.. } .. a ♦ %� . t .. •.. '. " .,ski' :E4.•� ._ _ . .. �� r � . � t �. '�' .. ' � .� ��� a 'I I . .. ,. •r. r,•r.. .1• . . rl•-i �. � •..•f#. . J '- SOSID:1355611R Date Filed: 1/9/2014 9:36;00 AM Elaine F. Marshall North Carolina Secretary of State C2013 364 00123 State of North Carolina Department of the Secretary of State APPLICATION FOR REGISTRATION AS A FOREIGN LIMITED PARTNERSHIP Pursuant to §59.902 of the General Statutes of North Carolina, the undersigned hereby submits this application for Registration as a Foreign Limited Partnership for the purpose of obtaining a Certificate of Authority to transact business in this State. 1. The name of the foreign limited partnership is: A%w a& %o i ie! NCy LAO( _ 2. If the name of the foreign limited partnership Is unavailable for use in the State of North Carolina, the name the limited partnership wishes to use is: Signature Ton Sail NC Ltd. LP (The name must contain the words "Limited Partnership," or the abbreviation "L.P." or "LP," or the combination "Ltd. Partnership".) 3: The Jurisdiction in which the IimiteQ'p ip was formed is re.V" and the darn of formation was M OL AJ The limited partnership's period of duration is Ot�L�iQ� 4. The street address of the principal office is: Number and Street: yd07 Recb)e Dr City: W� 7 State: Ak. ZlpCode*I'NiA County: N►✓lkwcvt! The mailing address, tftiilfferent jrom the sired address, of the principal office: Telephone: 71J •.0075"6Z3'Z. _ NumberandStreet: 9,y37e&*&agV 0J77 _ City: AU4161 State: 7r Zip Code: 770,,'f County: 5. NemeofRegisteredAgcnt: Jer),?;4I ReIA%k &-an3 . 6. Address of Registered Agent's Office: Number and Street: City: ../t/f (rho Y61 State: NC Zip Code: The mailing address, ((dUereni jrom the street address, of the registered office: Number and City: State: NC Zip Code: County: Nam: Plana fee to M This duammt omit be Ned with the Suntory of Sto% ../`tw/ArID✓C"', — CORPORATIONS DIVISION P.O.BOX 29622 RALEIGH, NC 27626.06222 (Revised August, 2013) Page I Form LP-04 i t , I �' . j„ ',.' . . r .. ,� ,. 7. In consideration of the issuance of a Certificate of Authority to transact business in North Carolina, the limited partnership appoints the Secretary of State of North Carolina as the agent to receive service of process, notice or demand, whenever the foreign limited partnership fails to appoint or maintain a registered agent in this State, or whenever such registered agent cannot with reasonable diligence be found at the registered office. 8. (Optional): Please provide a business e-mail address: Privacy Redaction The Secretary of State's Office will e-mail the bus ••� document Is filed. The e-mail provided will not be viewable on the website. For more information on why this service is being offered, please see the instructions for this document. 9. Enter the name and address of each general partner; (attach additional sheets If necessary) Name ,dork fund LLC jwr'11101, W�Jplj Ml i Nana; City State/zip 10. Limited Partners (select 1 or 2, as appropriate) ❑ Attached is a list of the names and addresses of all limited partners (include full name/street address/city/state/zip code/rounty); or The location of the office where list of the names and addresses of the limited partners and their capital contributions will kept be as long as the limited partnership transacts business in North Carolina is Number and Street: X?0-7 Pt-chle &4.. City: /yf -kin_ State: NC Zip Code: %t8VIZ- County: 4o✓f-" 11. (Select one) ❑ The foreign limited partnership Is a foreign limited liability limited partnership. 3'Me foreign limited partnership is not a foreign limited liability limited partnership. ! 12. This registration will be effective upon filing, unless a future date and/or time is specified ,. _ ,5'/6A/ArUXG TcP�Tirir- PVC, LTd Typed or pftted name 117�� i�C•r��o�ly`yi.0 _ �oCI• liiorrn�i✓� 7�ee.Tar�BO..ILC Title ✓6w..1 pQ'.I�e , N07£9: Mass fee Is$a0. This dMenral matt be madwrth the Seerehry OfSteis. CORPORATIONS DIVISION P.O.BOX 29622 ' RALEIGH, NC 27626.06222 (Revised August, 2013) Page 2 Form LP-04 GSP CONSULTING LETTER OFTP'.HNSNIITTL 6626 Gordon Road, Unit C WILMINGTON, NORTH CAROLINA, 28411 (910) 442-7870 FAX (910) 799-6659 TO: Steve Pusey NC Division of Water Quality 127 Cardinal Drive Ext. Wilmington, NC 28405 WE ARE SENDING YOU ❑ Fee Check ❑ Copy of Letter DATE 06/2 /16 JOB NO. 201 -0002 ATTENTION ATTENTION PHONE# RE: W ndwater — Phase 2 SW81 0 16 (Modification) ❑ Attached ❑ Under separate cover via ❑ Permit Applications ® Plans ❑ Calculations ❑ Change order ❑ Diskette ❑ COPIES DESCRIPTION 2 Revised Sheets C-5 & c-9 THESE ARE TRANSMITTED as checked below: the following items: ❑ Specifications ® For approval ❑ Approved as submitted ❑ Resubmit copies for approval ❑ For your use ❑ Approved as noted ❑ Submit copies for distribution ❑ As requested ❑ Returned for corrections ❑ Return corrected prints ❑ For review and comment ❑ _ ❑ FOR BIDS DUE ❑ PRINTS RETURNED AFTER LOAN TO US REMARKS: If enclosures are not as noted, kindly notify us at once. Pusey, Steven From: Pussy, Steven Sent: Thursday, June 23, 2016 9:52 AM To: 'Garry Pape' Subject: RE: Wyndwater Phase 1 SW8 140219 Garry, I just finished reviewing the plans and technical data on Wyndwater Phase 2. 1 noticed that drawing sheets, in particular Sheets C-5 and C-9, have not been updated with revised pond design criteria. The bottom elevation and sediment removal elevations are incorrect, as well as other data such as volume required, etc. Please revise and resend these plan sheets as well as any other information that may be affected. Note, you may also want to check Phase 3. Thanks, StWc fwe+ Environmental Engineer Division of Energy, Mineral and Land Resources — State Stormwater Program Department of Environmental Quality 910 796 7215 office 910 796 7334 direct steven.ousev(d)ncdenr.aov 127 Cardinal Drive Ext Wilmington, NC 28405 Cnngy. Mlnnal anO LanORrsour[n _ � on.r.wromuv Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. ® Before printing this email, please consider your budget and the environment. From: Garry Pape f mailto:gpape@gsp-consulting.com] Sent: Wednesday, June 22, 2016 3:48 PM To: Pusey, Steven <steven.pusey@ncdenr.gov> Subject: Wyndwater Phase 1 SW8 140219 Steve, Question for you. For the Wyndwater Phase 1 Permit, there is 2,119 SF of BUA allocated for Future. I need to modify the permit and basically move 1,000 sf of the future BUA to a lot. I'm just trying to figure out how to do this. Will this type of change require the full $505 fee? I'm assuming all I'll need to submit would be a revised application .and revised deed restriction. Is there anything else that would need to be submitted? I know you are really busy and I appreciate the time. Thanks. - Garry Garry S. Pape, P.E. GSP CONSULTING, PLLC 6626-C Gordon Road Wilmington, North Carolina 28411 Mobile: 910-442-7870 Fax:910-799-6659 e a e ri I, P-Consulting Com • —A—L' General Data: Impervious, Drainage Area and Volume PROJECT NUMBER: SW8 140416 Reviewer: KJohnson /S Pusey DRAINAGE BASIN: Cape Fear Current Date 23-Jun-16 Original Run Date: 2-Jun-14 DA Number 7/3/2014 8/3/2015 6/23/2016 4 5 6 7 8 9 10 BMP Type Wet Pond Wet Pond No BMP In DA No BMP in DA No BMP In DA No BMP in DA No BMP In DA No BMP In DA No BMP in DA No BMP in DA Receiving Stream Mullet Run Mullet Run Mullet Run Stream Index 18.87-9.1 18-87-9-1 18-87-9-1 Class Over W mile Over 12 mile Over 1Q mile impervious Area Proposed Impervious (ALL IMPERVIOUS), Total, ft2: 311,472 331,737 407,335 0 0 0 0 0 0 0 Onsite Buildings 247,500 243,000 258,436 Onsite Streets 46,6811 81,389 81,199 Onsite Parking 0 0 Onsite Sidewalks 17.291 7,348 7,400 Onsite Other 0 0 Future 0 0 60,300 Offsite 0 0 Existing 0 0 Pr oust • d n1 a Old Rule, Onsite Buildings 0 0 0 0 0 0 0 0 0 0 Onsite Streets Onsite Parking Onsite Sidewalks Onsite Other Future Offsite Existing 311,472 331,737 407,335 0 0 0 0 0 0 0 Drainage Area 947,143 986,812 1,046,055 Drainage Area, Total, ft': Onsite, ft2: 947,143 986,812 1,046,055 Offsite, 0: 0 0 0 Previously ermined D el age Aree,Old Rule, fl' 0 0 0 0 0 0 0 0 0 0 Onsile, ft2: Offste, ft': Proposed DA (Being Added By Mod), ft2: 947.143 986,812 1,046,055 Drainage Area, Subject to Old Rule, ft': 0 0 0 0 0 0 0 0 0 0 Drainage Area, Subject to New Rule, ft2: 947.143 986,812 1,046,055 Percent Impervious Overall, per DA: Volume Required: Simple Method Volume Required, Old Rule, ft': 32.89%1 33.62% 38.94% Rvp. e,,,,w, Old Rule: Design Storm, Old Rule, in: Volume Required, New Rule, ft': 40.960 43,488 52,363 RvP,eoe.. nnm. New Rule: 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 0.05 RVPen o..,l,em,m, New Rule: 0.35 0.35 0.40 P, Design Storm, , in: 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 P, Design Storm, M4n, in: Subject to SA? (V or N) N N N Volume Required,., ft': 40,960 43.488 52,363 Volume Requiredim4N, tt2: 0 0 0 VOtt a Required, Total (Old +New) Rule, ft': 40,960 43,488 52,363 ,-• Wet Ponds PROJECT NUMBER: SW8 140416 Reviewer: K Johnson / S Puse DRAINAGE BASIN: Cape Fear Current Date 23-Jun-16 Original Run Date: 2-Jun-14 j DA Number 713/2014 8/3/2015 3 4 5 6 7 8 9 10 EMIR Type Well Pond WetPond NOB,VP In DA NOBMPIn DA No BMPin DA No SMPin DA NOBMPin DA No SMPIn DA NOBMPin DA NOBMPIn DA Minimum Surface Area %Impervious 32.9% 33.62% 38,94% Lower Impervious 30.0% 30.0% 30.0% #VALUEI #VALUEI #VALUEI #VALUE! #VALUEI #VALUE! #VALUE! Upper Imervious 40.0% 40.0% 40.0% #VALUE! #VALUEI #VALUEI #VALUEI #VALUEI #VALUE! #VALUEI TSS 85 or 90): 90 90 90 Lower SAIDA 2.7 2.7 2.5 #VALUE! #VALUEI #VALUEI #VALUEI #VALUEI #VALUEI #VALUE! Upper SA/DA 3.5 3.5 3.1 #VALUEI #VALUEI #VALUE! #VALUE! #VALUEI #VALUEI #VALUEI SA/DA ratio 2.9 3.0 3.0 #VALUEI #VALUEI #VALUE! #VALUE! #VALUEI #VALUEI #VALUE! PP Surface Area req. : 27,759 29.499 31,762 #VALUEI #VALUEI #VALUE! #VALUE! #VALUEI #VALUE! #VALUEI Stora a Calculations 15.00 14.00 13.00 Elevation, Bottom of Sediment excavated de th ,fmsl: Elevation; Top of Sediment bottom pond/deigned bottom ,fms1: 16.00 15.00 14.00 Elevation, Bottom of shelf, fmsl: 20.00 20.00 20.00 Elevation; Permanent Pool fmsl: 20.50 20.50 20.50 Elevation, Top of Shelf, fmal: 21.00 21.00 21.00 Elevation, Temp. Pool, fmsl: 21.80 21.80 21.84 Area, Top of Sediment (bottom pond/designed bottom), ft2: 11,275 17,924 10.888 Area, Bottom of Shelf, fe: 24,897 29,622 29.622 Area, Perm Pool, a2: 28,779 33.673 33,673 Area, Top of Shelf, fir: 32,830 37,894 39,683 Area, Tem .Pool, f12: 35,852 41,540 41,633 Volume Provided(Temp Pool), DWO Calculated, tta: 42,875 49,665 52,492 0 0 0 0 0 0 0 Volume Provided iTemp Pool , Pmvided oar Comudant, ft3: 42,875 49,665 52,492 Volume Required(Temp Poop, DWO Calculated, It': 40,980 43,488 52,363 Consultant Provided Enough Volume? y y y Average Depth Option 1 or Option 2 Enter 1 or 2? 2 2 2 Average Depth Provided, ft: 4.0 4.0 4.5 Average Depth - OPTION 1 -, DINO Calculated, tt: 3.56 3.73 4.08 #DIV/01 #DIV/01 #DIV/01 #DIV/01 #DIV/01 #DIV101 #DIV/01 Average Depth - OPTION 2 -, DWO Calculated, ft: 3.5 4.50 4.50 #DIV/01 #DIV/01 #DIV/01 #DIV/0! #DIV/01 #DIV/O! #DIV/01 ForebayVolume Permanent Pool Volume, fi': 102.545 125,577 137,354 0 0 0 0 0 0 0 Forebay Volume, Required, ff': 20,509 25,115 27,471 0 0 0 0 0 0 0 Forebay Volume, Provided, ft': 22,150 25,878 29,015 Percent of Permanent Pool (18-22% is Target): 22% 21 % 21% #DIV/01I #DIV/01 #DIV/01 #DIV/01 #DIV/01 #DN/01 #DIV/01 Drawdown Av era a Head ft: 0.38 0.38 0.39 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average Flow 02, ft'/sec: 0.237 0.252 0.303 #VALUEI #VALUEI #VALUEI #VALUE! #VALUEI #VALUE! #VALUEI Average Flaw Q5, ft/sec: 0,095 0.101 0.121 #VALUE! #VALUEI #VALUEI #VALUE! #VALUEI #VALUEI #VALUEI Q2 Area, m2: 11.429 12.245 14.491 #VALUE! #VALUEI #VALUEI #VALUE! #VALUE! #VALUE! #VALUEI 05 Area, in2: 4.572 4.898 5,796 #VALUEI #VALUEI #VALUE! #VALUEI #VALUEI #VALUEI #VALUEI No. of Orifices 1 1 1 Orifice Diameter, in: 3.501 4.00 4.00 Orifice Area, in2: 9.621 12.566 12.566 0,000 0,000 0.000 0.000 0.000 0.000 0.000 Weir Height, in: Weir Length, in: Weir C: #DIV/01 #DIV/01 #DIV/01 #DIV/01 #DIV/01 #DIV/01 #DIV/01 #DIV/01 #DN/01 #DIV/01 Weir L, Effective Length, ft: -0.077 -0.076 .0.078 0,000 0.000 0.000 0.000 0.000 0.000 0.000 Average Orifice Flowrate, DINO Calc (Q..) It3/sec: 0.200 0.258 0,263 0,000 0.000 0.000 0.000 0.000 0.000 0.000 Average Onfice Flowrate, Reported (OR,Pan,a) ff'/sec: 0.210 0.280 0.280 Average Orifice Flowrate is Adequate? sat Range MCat y y y Runoff Coefficient Cc: 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 0.250 1 yr 24 hr rainfall depth, in: 1 yr 24 hr Intensity (1) mmr: 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 1 yr 24 hr Pre -Development (0), ff3/sec: 0.000 0,000 0.000 Avg. Orifice Bow<Pre Q? N N N Drawdown, days: 2.38 1.95 2.31 Pump 1/3 112 1/2 N/A N/A N/A N/A N/A N/A N/A Max HP: Casmer, Jo" From: Casmer, Jo Sent: Thursday, May 12, 2016 9:10 AM To: 'mike@signature-companies.com'; Garry Pape (gpape®gsl-consulting.com) Subject: Wyndwater Phase 2; Stormwater Permit SW8 140416 The Wilmington Regional Office of the Division of Energy. Mineral, and Land Resources (Stormwater Section) received the Stormwater Permit Application and $505.00 fee on May 5, 2016. The project has been assigned to Steve Pusey and you will be notified if additional information is needed. Please be advised that the construction of built -upon area may not commence until the Stormwater Permit is issued. Jo Casmer Administrative Assistant for DEMLR/Stormwater Section North Carolina Department of Environmental Quality Department of Environmental Assistance & Customer Service 910 798-7336 office 910 350-2004 fax io.casmeKVi ncdenr.aov 127 Cardinal Drive Extension Wilmington, NC 28405 Z. Nothfng Compares_-.. Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. -- -1.1 GSP CONSULTING LETTER OF Tf'�\NSNIITTI L TO: 6626 Gordon Road, Unit C WILMINGTON, NORTH CAROLINA, 28411 (910) 442-7870 FAX (910) 799-6659 NC Division of Water Quality 127 Cardinal Drive Ext. Wilmington, NC 284o5 DATE 0 /O /16 JOB NO. 201 -0002 ATTENTION ATTENTION PHONE# RE: W ndwater — Phase 2 SW8 1 0 16 (Modification) WE ARE SENDING YOU ❑ Attached ❑ Under separate cover via ® Fee Check ® Permit Applications ® Plans ® Calculations ❑ Copy of Letter ❑ Change order ❑ Diskette ❑ the following items: ❑ Specifications COPIES DESCRIPTION 2 Sets of plans & calculations for state stormwater modification 2 Stormwater Management Permit Application Forms (one original, one copy) 1 Wet Detention Basin Supplement & Checklist 1 Wet Detention Basin Operation and Maintenance Agreement 1 Application fee for $5o5.00 THESE ARETRANSMITTED as checked below: ® For approval ❑ Approved as submitted ❑ For your use ❑ Approved as noted ❑ As requested ❑ Returned for corrections ❑ For review and comment ❑ ❑ FOR BIDS DUE ❑ PRINTS RETURNED AFTER LOAN TO US REMARKS: COPYTO: File ❑ Resubmit copies for approval ❑ Submit copies for distribution ❑ Return corrected prints SIGNED: - Garry S. Pape. P.E. if enclosures am not as noted, kindly notify us at once. DEMLR USE ONLY D to R eiv deg Paid Permit Numbe Applicable Rulesf ❑ Coastal SW — 1995 ❑ Coastal SW — 2008 ❑ Ph II - Post Construction (,select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Slormwater Management Plan ❑ Other WQ M mt Plan: State of North Carolina Department of Environment and Natural Resources Division of Energy, Mineral and Land Resources STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may he photocopied for use as art original I. GENERAL INFORMATION 1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Wyndwaier - Phase 2 2. Location of Project (street address): Sloop Point Loop Road Cily:Hantpslead County:Pender Zip:28443 3. Directions to project (from nearest major intersection): Project is approximately 2 mi heading southeast on Sloop Point Loop Road from US 17/Sloop Point Loop 4, Latitude:34° 24' 10" N Longitude:77° 37' 39" W of the main entrance to the project. IL PERMIT INFORMATION: I. a. Specify whether project is (check one): ❑New ®Modification ❑ Renewal w/ Modificationt tRenemals with modifications also requires SWU-102 — Renewal Application Form b. If this application is being submitted as the result of a modification to an existing permit, list the existing permit numberSW8 140416 - , its issue date (if known)Aucusl 3, 2015 , and the status of construction: ❑Nut Started ®Partially Completed* ❑ Completed* *provide a designer's certification 2. Specify the type of project (check one): ❑Low Density EHigh Density ❑Drains to an Offsite Stonnwater System ❑Other 3. If this application is being submitted as the result of a previously returned application or a letter from DEMLR requesting a stale stormwaler management permit application, list the stormwater project number, if assigned, and the previous name of the project, if different than currently proposal, _ 4. a. Additional Project Requirements (check applicable blanks; information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑LAMA Major ❑NPDES Industrial Slormwater ESedimentation/Erosion Control: 29.35 ac of Disturbed Area 0404/401 Permit: Proposed Impacts b. If any of these permits have already been acquired please provide the Project Name, Project/Permit Number, issue date and the type of each permit: 5. Is the project located within 5 miles of a public airport? ®No ❑Yes If yes, see S.L. 20I2-200, Part Vl: http•//portal.ncdenr.org/web/Ir/nies-and-regulations ECIE6!/E MAY 0 5 2016 Form SWU-101 Version Ocl. 31, 2013 Page I of 6 IIL CONTACT INFORMATION 1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee, designated government official, individual, etc. who owns the nroiect): Applicant/Organization:Signature Too Sail NC LP Signing Official & Title:Michael H. Pollak - Manaser b.Conlact information for person listed in item la above: Street Address:9337B Kay Freeway #377 City:Housion State:TX Zip:77024 Mailing Address (if applicable): City: State: Zip: Phone: (713 1 822-3891 Fax: ( ) Emai I: mike @ si mature-companies.com c. Please check the appropriate box. The applicant listed above is: ® The property owner (Skip to Contact Information, item 3a) ❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below) ❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and 2b below) ❑ Developer* (Complete Contact Information, item 2a and 2b below.) 2. a. Print Property Owner's name and tide below, if you are the lessee, purchaser or developer. (This is the person who owns the property [hat the project is located on): Property Owner/Organization: Signing Official & Title: b.Contact information for person listed in item 2a above: Street Address: City: Stale: Zip: Mailing Address (if applicable): City: State: Zip: Phone: ( ) Fax: ( ) Email: 3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other person who can answer questions about the project: Other Contact Signing Official & b.Comact information for person listed in item 3a above: t Mailing Address: City: Phone: ( 1 Email: 4. Local jurisdiction for building permits: Point ol'Contacl: Zip: Fax: Phone #: MAY 0 5 2015 BY: Form SWU-101 Version Oct. 31, 2013 Page 2 of 6 IV. PROJECT INFORMATION I. In the space provided below, hnunv summarize how the stormwater runoff will be treated. Wet Detention Basin 2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved: ❑ Approval of a Site Specific Development Plan or PUD Approval Date: ❑ Valid Building Permit Issued Date: ❑ Other: Date: b. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with: ❑ Coastal SW — 1995 ❑ Ph 11— Post Construction 3. Stormwater runoff from this project drains to the Cane Fear River basin. 4. Total Property Area: 24.01 acres 5. Total Coastal Wetlands Area: 6. Total Surface Water Area: 7. Total Property Area (4) —Total Coastal Wetlands Area (5) —Total Surface Water Area (6) = Total Project Area': 24_01acres ' Total project area shall be calculated to exclude the following: the normal pool of impounded structures, die area between the banks of streams and rivers, the area below the Normal High Water (NHW) line or Mean High Water (MHW) lute, and coastal wetlands landward front the Nil (or MHW) line. The resultant project area is used to calculate overall percent built upon area (BUA). Non -coastal wetlands landward of die NHW (or MHW) line maybe included in the total project area. 8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 38.9 _% 9. How many drainage areas does the project have? I (For high density, count I for each proposed engineered stormwater BMP. ror low density and other projects, use I far the whole property area) 10. Complete the following information for each drainage area identified in Project Information item 9. If there are more than four drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Basin Information Drainage Area I Drainage Area _ Drainage Area _ Drainage Area Receiving Stream Name Mullet Run Stream Class * SA, HQW > 0.5 mile Stream Index Number * 18-87-9-1 Total Drainage Area (st) 1,046,055 On -site Drainage Area (sf) 1,046,055 Off -site Drainage Area (so Proposed Ito ervious Area** (st) 407,335 % Impervious Area** (total) 38.9 Impervious** Surface Area Drainage Area 1 Drainage Area _ Draina a Area _ Draina e Area On -site Buildings/Lots (sl) 259,436 On- siteSucets (sf) 81,199 On -site Parking (sl) On -site Sidewalks (sl) 7,400 Other on -site (so Future (sl) 60,300 Off -site (sf) MAY inte LE 8xisling BUA*** (sl) 1 Total (st): 1 407,335 RV; * Stream Class and Index Number can be determined aC lutpLAnorml.ricdeiir.org/webhvrllrs/c.sa/classifications ** Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. *** Report only that aniouru of existing BUA that will remain after development. Do not report any eA'isting BUA that is to be removed and Which will be replaced by new BUA. Form SWU-101 Version Oct. 31, 2013 Page 3 of 6 11. How was the off -site impervious area listed above determined? Provide documentation. Proieets in Union County: Contact DEMLR Central Office staff to check if the project is located within a Threatened & Endangered Species watershed that may be subject to more stringent stormwater requirements as per 15A NCAC 02B .0600. V. SUPPLEMENT AND O&M FORMS The applicable stale stormwater management permit supplement and operation and maintenance (O&M) forms must be submitted for each 13MP specified for this project. The latest versions of the forms can be downloaded from hitp://Voriiii.nc(lenr.oraweb/w(i/ws/su/binp-inanual. VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Energy, Mineral and Land Resources (DEMLR). A complete package includes all of the items listed below. A detailed application instruction sheet and [IMP checklists are available from hltp:Hportal.ncdenr.org/web/wq/ws/su/statesw/Ibrms does. The complete application package should be submitted to the appropriate DEMLR Office. (The appropriate office may be found by locating project on the interactive online map at http://portal.ncdenr.orglweb/wg/ws/su/maps.) Please indicate that the following required information have been provided by initialing in the space provided for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for each submitted application package from http:Hportal.ncdenr.ory/weh/wcl/ws/su/statesw/forms does. Initia I. Original and one copy of the Stormwater Management Permit Application Form. 2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants Form. (if'required as per Part Vll below) 3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M agreement(s) for each BMP. 4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to hop://www.enviielp.org/Vages/onestopexpress.html for information on the Express program and the associated fees. Contact the appropriate regional office Express Permit Coordinator for additional information and to schedule the required application meeting.) 5. A detailed narrative (one to two pages) describing the stormwater treatment/management for the project. This is required in addition to the brief summary provided in the Project Information, item I. p 6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the--��-►L-a�\Z— receiving stream drains to class SA waters within'/n mile of the site boundary, include the''/a mill radius on the map. 7. Sealed, signed and dated calculations (one copy). 8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including: a. Development/Project name. b. Engineer and firm. c. Location map with named streets and NCSR numbers. d. Legend. e. North arrow. f. Scale. g. Revision number and dates. It. Identify all surface waters on the plans by delineating the normal pool elevation of impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal waters, and any coastal wetlands landward of the MHW or NHW lines. • Delineate the vegetated buffer landward from the normal pool elevation of impounded structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters. i. Dimensioned property/project boundary with bearings & distances. J. Site layout with all BUA identified and dimensioned. k. Existing contours, proposed contours, spot elevations, finished floor elevations. I. Details of roads, drainage features, collection systems, and stormwater control measures. in. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a ®®®® qualified person. Provide documentation of qualifications and identify the person who PECE IVE made the determination on the plans. n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations ; MAY U 5 2016 o. Drainage areas delineated (included in the main set of plans, not as a separate document} p. Vegetated buffers (where required). f3Vt_ Form SWU-101 Version Oct. 31, 2013 Page 4 of 6 9.' Copy of any applicable soils report with the associated SHWT elevations (Please identify elevations in addition to depths) as well as a map of the boring locations with the existing elevations and boring logs. Include an 8.5"x I I" copy of the NRCS County Soils map with the project area clearly delineated. For projects with infiltration BMPs, the report should also include the soil type, expected infiltration rate, and the method of determining the infiltration rate. (Infiltration Devices submitted to WiRO: Schedule a site visit for DEMLR to verify the SHWT prior to submittal, (910) 796-7378.) 10. A copy of the most current properly deed. Deed book: 4379 Page No: 330 11. For corporations and limited liability corporations (LLC): Provide documentation from the NC Secretary of State or other official documentation, which supports the titles and positions held by the persons listed in Contact Information, item la, 2a, and/or 3a per 15A NCAC 21-1.1003(c). The corporation or LLC must be listed as an active corporation in good standing with the NC Secretary of State, otherwise the application will be returned. ham://www.secretitry.s(a(c. nc. us/Corporations/CSearch.aspx VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS For all subdivisions, outparcels, and future development, the appropriate properly restrictions and protective covenants are required to he recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and protective covenants forms can be downloaded from ham://12ortal.ncdenr.org/web/Ir/state-stormwater-forms does. Download the latest versions for each submittal. In the instances where the applicant is different than the properly owner, it is the responsibility of the property owner to sign the clued restrictions and protective covenants form while the applicant is responsible for ensuring that the deed restrictions are recorded. By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and protective covenants for this project, if required, shall include all the items required in the permit and listed on the forms available on the website, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the- NC DE111LR, and that they will be recorded prior to the sale of any lot. VI11. CONSULTANT INFORMATION AND AUTHORIZATION Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as addressing requests for additional information). Consulting Engineer:Garry S. Pape, P.E. Consulting Firm: GSP Consulting, PLLC Mailing Address:6626 Gordon Road Unit C City:Wilminglon Slalc:NC Zip:28411 Phone: (910 ) 442-7870 Pnu il:gpapc0a gsp-consulting.com Fax: (910 ) 799-6659 IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this section) I, (print or rype name of person listed in Contact Information, item 2a) , certify that I own the property identified in this permit application, and thus give permission to (print or type name of person listed in Contact Information, item ]a) with (print or type name of organization listed in Contact Information, item /a) to develop the project as currently proposed. A copy of the lease agreement or pending property sales contract has been provided with the submittal, which indicates the party responsible for the operation and maintenance of the stormwater system. MECEIVE + MAY 0 5 2016 Form SWU-101 Version Oct. 31. 2013 Page 5 of 6 As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their lease agreement, or pending sale, responsibility for compliance with the DEMLR Stormwater permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DEMLR immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment of civil penalties of up to $25,000 per day, pursuant to NCGS 143-215.6. a Notary Public for the State of County of do hereby certify that before me this _ day of personally appeared and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission X. APPLICANT'S CERTIFICATION 1, (print or type name of person listed in Contact Information, item 1a) Michael H. Pollak 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 ill be recor e an t the proposed project complies with the requirements of the applicable stop ten s id.1000 and any other applicable state stormwater requirements. Rionnhira- Date: 3-17 `4 T 9? in- a Notary Public/I for e a of IYok/ tiJ I I Pic, County of do heiI- ertify that \ e l 1 r� G �IG personally appeared before me this ay of _ VVI , ZdLi, .and iowledge the du xecution of the application for a stormwater permit. Witness my hand and official seal,rz Al �w�muutunu� aPPy IS Pq o . NpTARy U 2 PUBLIC' '°1QNCVER GOJ �hnrnnn:orunN�O SEAL My commission expiresZU ZU _ ECEIVE MAY 0 5 2016 BY. Form SWU-101 Version Oct. 31.2013 Page 6 of 6 '! ,1 ;i r �,.., �.. � I .J.��'��). ;��r�d �I;'�� �1a j�,i t�.;. G. Li.' ;�. � �� � v, � I � i..i ' i � / v �� / -r 7' � i��,. ` � �� ,f `. �� `. � il'�i: `. �.' Permit Number: (to be provided by DWQ) Drainage Area Number: Wet Detention Basin Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one): ❑ does ® does not This system (check one): ❑ does ® does not incorporate a vegetated filter at the outlet. incorporate pretreatment other than a forebay. Important maintenance procedures: — Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks). — No portion of the wet detention pond should be fertilized after the first initial fertilization that is required to establish the plants on the vegetated shelf. — Stable groundcover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. — If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. — Once a year, a dam safety expert should inspect the embankment. After the wet detention pond is established, it should be inspecte °a-flfhnrn un — within 24 hours after every storm event greater than 1.0 inches ( 1.5 iinnyh�els�if� �,a Coastal County). Records of operation and maintenance should ep }t se location and must be available upon request. BY: Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblem: How I will remediate theproblem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the wet Areas of bare soil and/or Regrade the soil if necessary to detention basin erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. Vegetation is too short or too Maintain vegetation at a height of long. approximately six inches. Form SW401-Wet Detention Basin O&M-Rev.4 Page I of 4 �1 BMP element: The inlet device: p swale IYT Permit Number: (to be provided by DWQ) Drainage Area Number: Potentialproblem: or I The pipe is clogged. The main treatment area The pipe is cracked or otherwise damaged. Erosion is occurring in the swale. Sediment has accumulated to a depth greater than the original design depth for sediment storage. has occurred. Weeds are present. Best professional practices show that pruning is needed to maintain optimal plant health. Plants are dead, diseased or dying. Weeds are present. Sediment has accumulated to a depth greater than the original design sediment storage depth. Algal growth covers over 50% of the area. Cattails, phragmites or other invasive plants cover 50% of the basin surface. How 1 will remediate the Unclog the pipe. Dispose sediment off -site. Replace the pipe. Regrade the swale if necessary to smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Prune according to best professional practices Determine the source of the problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. _ Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. _ Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Consult a professional to remove and control the algal growth. Remove the plants by wiping them with pesticide (do not spray). MAY 0 5 2016 Form SW401-Wet Detention Basin O&M-Rev.4 Page 2 of 4 Permit Number: (to be provided by DWQ) Drainage Area Number: BMP element: Potentialproblem: How I will remediate theproblem: The embankment Shrubs have started to grow Remove shrubs immediately. on the embankment. Evidence of muskrat or Use traps to remove muskrats and beaver activity is present. consult a professional to remove beavers. A tree has started to grow on Consult a dam safety specialist to the embankment. remove the tree. An annual inspection by an Make all needed repairs. appropriate professional shows that the embankment needs repair. (if applicable) The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off -site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Division of damage have occurred at the Water Quality Regional Office, or outlet. the 401 Oversight Unit at 919-733- 1786. The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 6.5 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 5.5 feet in the forebay, the sediment shall be removed. Sediment Removal Bottom 15 --------------- FOREBAY BASIN DIAGRAM ill in the blanks) I-ft Min. Sediment Storage Form SW401-Wet Detention Basin O&M-Rev.4 Permanent Pool Elevation 20.5 Sediment Removal Elevation 14 volum, -------_-- ------ Bottom Elevation MAIN POND ECEIVE 1 MAY 0 5 2016 BY; Page 3 of 4 1-ft Storage ,•� Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project nante: Wyndwater Phases.— Pond #I BMP drainage basin number: Print name: Signature Top Sail NC, LP - Michael H. Pollak Title: Manager Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, Garry S. Pape , a Notary Public for the State of North Carolina County of New Hanover do hereby cenjfy that Michael H. Pollak personally appeared before me this day of Mw~e. , WI b , and acknowledge the due execution f the forgoi g infiltration basin maintenance requirements. Witness my hand and official seal, P" NOTAR l,, EZc PUBOG '�y,'yZ410;n iuCo` SEAL My commission expires April 13, 2020 ECEIVE q MAY 0 5 2016 By:_ --- Form SW401-Wet Detention Basin O&M-Rev.4 Page 4 of 4 Permit No. �/I %" W 4� (to be provided by OWQ) m M♦CDEH O� pVJA iF9 OG NCDENR -i STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Pad 111) must be printed, filled out and submitted along with all of the required information. IPROJECT INFORMATION Project name Wyndweler Phase 2 Contact person Garry S. Pape, P.E. Phone number 910-442.7870 Date 4-May Drainage area number 1 II. DESIGN INFORMATION ; Site Characteristics Drainage area Impervious area, post-developmenl % impervious Design rainfall depth Storage Volume: Non -SA Waters Minimum volume required Volume provided Storage Volume: SA Waters 1.5' runoff volume Pre -development 1-yr, 24-hr runoff Post -development I-yr, 24-hr runoff Minimum volume required Volume provided Peek Flow Calculations Is the prelpost control of the 1yr 24hr storm peak flow required? 1 yr, 24-hr rainfall depth Rational C, pre -development Rational C, post -development Rainfall intensity: 1-yr, 24-hr storm Pre -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHVIT elevation (approx. at the perm. pool elevation) Top of 10n vegetated shelf elevation Bottom of 10tt vegetated shelf elevation Sediment cleanout, top elevation (bottom of pond) Sediment cleanout, bottom elevation Sediment storage provided Is there additional volume stored above the state -required temp. pool? Elevation of the top of the additional volume Form SW401-Wet Detention Basin-Rev.9.4/18,r12 1,046,055 it' 407,335 It' 38.94 % 1.5 in 52,363 n' 52,492 tt' n' Its n' it OK, volume provided is equal to or in excess of volume required. N (Y or N) 3.8 in 0.20 (unitless) 0.49 (unnless) 5.00 In/hr OK 24.01 n'/seo 59.08 ft'/sec 35.07 n'/sec 21.84 fmsl 20.50 final �'.• 20.90 first = :iz SEAL 21.00 tryst = 031315 20.00 first14.00 fmsl = ' i 13.00 0o itsl /��c�RRY S IN ��A[������ N (Y or N) fmsl ECEIVE MAY 0 5 I'll p Is 1.8 11. Design Summary, Page 1 of 2 WV: Permit No. (to be provided by DWO) II DESIGN INFORMATION -— Surface Areas Area, temporary pool 41,633 B' Area REQUIRED, permanent pool 31,800 it, SAIDA ratio 3.04 (unitless) Area PROVIDED, permanent pool, A,,,, p,u 33,673 it' OK Area, bottom of 100 vegetated shelf, A,_., 29.622 ft' Area, sediment cleanoul, top elevation (bottom of pond), Abu. 10.888 ft' Volumes Volume, temporary pool 52,492 it' OK Volume, permanent pool, V„„. 138,674 rya Volume, forebay (sum of forebays if more than one forebay) 29,015 fh Forebay % of permanent pool volume 20.9 % % OK SA/DA Table Data Design TSS removal 90 % Coastal SAIDA Table Used? Y (Y or N) Mountain Piedmont SAIDA Table Used? (Y or N) SAIDA ratio 3.04 (unitless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10.21g) N (Y or N) Volume, permanent pool, V,,, . 138,674 fls Area provided, permanent pool, A,,_„u 33,673 tt' Average depth calculated it Need 3 it min. Average depth used In SAIDA, d,„ (Round to nearest 0.5tt) it Calculation option 2 used? (See Figure 10-21b) Y (Y or N) Area provided, permanent pool, A,, se, 33,67311' Area, bottom of 1Oft vegetated shelf, A.,u, 29,622 it' Area, sediment cleanoul, top elevation (bottom of pond), A� ,,,,a 10,888 it, 'Depth' (distance b/w bottom of 1 Oft shelf and top of sediment) 6.00 it Average depth calculated 4.57 it OK Average depth used in SAIDA, d,,, (Round to down to nearest 0.5f1) 4.5 it OK Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 4.00 in Area of orAlce (if -non -circular) in' Coefficient of discharge (Cu) 0.60 (unhless) Driving head (H,) 0.45 it Drawdown through weir? (Y or N) Weir type (unXless) Coefficient of discharge (C.) (unitless) Length of weir (L) 1t Driving head (H) it Pre -development 1-yr, 24-hr peak flow 24.01 ttn/sec Post -development 1-yr, 24-hr peak flow 59.06 rya/sec Storage volume discharge rate (through discharge orifice or weir) 0.28 ft3/sec Storage volume drawdown time 2.16 days OK, draws down In 2-5 days. Additional Information Vegetated side slopes 3 :1 OK Vegetated shelf slope 10 :1 OK Vegetated shelf width 10.0 it OK E C E I V E Length of flowpath to width ratio 3 :1 OK Length to width ratio 1.6 :1 OK Trash rack for overflow & orifice? Y (Y or N) OK MAY 0 5 2016 Freeboard provided 2.0 it OK Vegetated filter provided? N (Y or N) OK Recorded drainage easement provided? Y (Y or N) OK BY:- Capures all runoff at uBimate build -out? Y (Y or N) OK Drain mechanism for maintenance or emergencies is: Mechanical Form SW401-Wet Detention Basin-Rev.9-4/1 all Pans L a tl. Design Summary, Page 2 of 2 Permit No. (to be provides' by DWO) III. REQUIRED ITEMS CHECKLIST Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page/ Plan itfals WL r Ifo G 9 6-1 c• to Plans (1" - 50' or larger) of the entire site showing: - Design at ultimate build -out, - Off -site drainage (if applicable), - Delineated drainage basins (include Rational C coefficient per basin), Basin dimensions, Pretreatment system, High flow bypass system, Maintenance access, Proposed drainage easement and public right of way (ROW), Overflow device, and Boundaries of drainage easement. 2. Partial plan (i" = 30' or larger) and details for the wet detention basin showing: - Outlet structure with trash rack or similar, Maintenance access, Permanent pool dimensions, Forebay and main pond with hardened emergency spillway, Basin cross-section, Vegetation specification for planting shelf, and Filter strip. 3. Section view of the wet detention basin (1" = 20' or larger) showing: Side slopes, 3:1 or lower, Pretreatment and treatment areas, and Inlet and outlet structures. 4. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified on the plans prior to use as a wet detention basin. 5. A table of elevations, areas, incremental volumes & accumulated volumes for overall pond and for forebay, to verify volume provided. 6. A construction sequence that shows how the wet detention basin will be protected from sediment until the I_ p1 entire drainage area is stabilized. The supporting calculations. M098. IA copy of the signed and notarized operation and maintenance (0&M) agreement. �✓A 9. A copy of the deed restrictions (if required). Ldw 10. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. County soil maps are not an acceptable source of soils information. Form SW401-Wet Detention Basin-Rev.9-4/18/12 ECEIVE py MAY 0 5 2016 Pa ptl' age 1 of 1 I High Density Residential Subdivisions Deed Restrictions & Protective Covenances In accordance with Title 15 NCAC 2H.1000 and S.L. 2006-246, the Stormwater Management Regulations, deed restrictions and protective covenants are required for High Density Residential Subdivisions where lots will be subdivided and sold and runoff will be treated in an engineered stormwater control facility. Deed restrictions and protective covenants are necessary to ensure that the development maintains a "built -upon" area consistent with the design criteria used to size the stormwater control facility. I, Michael H. Pollak, acknowledge, affirm and agree by my signature below, that I will cause the following deed restrictions and covenants to be recorded for Wvndwater - Phase 2 prior to the sale of any lot: 1. The following covenants are intended to ensure ongoing compliance with State Stormwater Management Permit Number SW8 140416, as issued by the Division of Water Quality under the Stormwater Management Regulations. 2. The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the stormwater management permit. 3. These covenants are to run with the land and be binding on all persons and parties claiming under them. 4. 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. 5. Alteration of the drainage as shown on the approved plan may not take place without the concurrence of the Division of Water Quality. 6. The maximum allowable built -upon area per lot is See Attached square feet. This allotted amount includes any built -upon area constructed within the lotpro�daries, 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. OR, if the proposed built -upon areas per lot will vary, please REPLACE #6 above with the following: 6. The maximum built -upon area per lot, in square feet, is as listed below: Lot # BUA Lot # BUA Lot # BUA Lot # BUA 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. Each lot will maintain a 30" foot wide vegetated buffer between all impervious areas and surface waters. "50 foot for projects located in the 20 coastal counties. 8. All runoff from the built -upon areas on the lot must drain into the permitted system. This may be accomplished through a variety of means including roof drain gutters which drain to the street, grading the lot to drain toward the street, or grading perimeter swales to collect the lot runoff and directing them into a component of the stormwater collection system. Lots that will naturally drain into the system are not required to provide these additional measures. ECEIVE MAY 0 !i 2016 Form DRPC-3 Rev.2 05Nov2009 Page I of 2 By: ` . High Density Residential Subdivisions Deed Restrictions & Protective Covenances I, Garry S. Pape , a Notary Public in the State of North Carolina County of New Hanover do hereby certify that Michael H. Pollak personally appeared before me this the day of g-i'VI ,, ` , 20�, and acknowledge the due executio of the foregoing instrument. Witness my hand and official seal, `up1111i141I//! �.��`�"pp`.P.FY �FEAL F SigTT NOTA/?1' u My Commission expires April 13, 2020 ;y p V _c= :c9 UBUG ?a nECEIVE BY: Form DRPC-3 Rev.2 05Nov2009 Page 2 of 2 PHASE 2 - ALLOWABLE BUA AREAS LOT# TOTAL LOT# TOTAL LOT 44 4,500 LOT 75 4,500 LOT 45 4,500 LOT 76 4,500 LOT 46 4,500 LOT 77 4,500 LOT 47 4,500 LOT 78 4,500 LOT 48 4,500 LOT 79 4,500 LOT 49 4,500 LOT 80 4,500 LOT 50 4,500 LOT 81 4,500 LOT 51 4,500 LOT 82 4,500 LOT 52 4,500 LOT 83 4,500 LOT 53 4,500 LOT 84 4,500 LOT 54 4,500 LOT 85 3,738 LOT 55 4,500 LOT 86 3,628 LOT 56 4,500 LOT 87 3,628 LOT 57 4,500 LOT 88 3,628 LOT 58 4,500 LOT 89 3,628 LOT 59 4,500 LOT 90 3,628 LOT 60 4,500 LOT 91 3,628 LOT 61 4,500 LOT 92 4,043 LOT 62 4,500 LOT 93 3,665 LOT 63 4,500 LOT 94 3,987 LOT 64 4,500 LOT 95 3,688 LOT 65 4,500 LOT 96 3,688 LOT 66 4,500 LOT 97 3,911 LOT 67 4,500 LOT 98 3,625 LOT 68 4,500 LOT 99 3,625 LOT 69 4,500 LOT 100 3,625 LOT 70 4,500 LOT 101 3,625 LOT 71 4,500 LOT 102 3,625 LOT 72 4,500 LOT 103 3,625 LOT 73 4,500 LOT 104 3,698 LOT 74 4,500 �4 MAY 0 5 2016 WYNDWATER - PHASE 2 STORM WATER NARRATIVE & CALCULATIONS May 3, 2016 � 11111 SEAL r 031315 = GSP CONSULTING, PLLC. 6626 Gordon Road, Unit C Wilmington, North Carolina 28411 (910)442-7870 ECEIVE MAY 0 5 201S STORMWATER NARRATIVE WYNDWATER - PHASE 2 PENDER COUNTY, NC SITE DESCRIPTION This +/- 28.35 acre site is located off Sloop Point Loop Road (S.R. 1563) (PIN 4214-12-8251- 0000) in Pender County, North Carolina. This phase of the project will drain to a proposed wet detention basin that will discharge to a ditch that runs along the northern property line of the site. This phase of the project will consist of the construction of 63 single family lots and related site appurtenances. The proposed drainage area for this project is 24.01 acres and the total amount of impervious area draining to the wet detention basin is 38.9%. The proposed disturbed area for this phase of the development is approximately 28.35 acres. There are no wetlands located within the limits of this phase of the project which have been field verified by the USACOE. The site will be developed by Signature Top Sail NC, LP c/o Michael 1-1. Pollak — Manager. Water is available to the site via a main owned by Pender County Utilities that was constructed with Phase 1 of this development and sewer will be accomplished by a mixture of drain fields & sewer owned and operated by Pluris, Inc.. SOILS The soils for this project consist of Autryville series soils (Hydrologic Soil Group A), Baymeade Series Soils (Hydrologic Soil Group A) and Foreston Series Soils (Hydrologic Soil Group Q. The Autryville series are well drained soils near drainageways on convex divides on uplands. The Baymeade series consist of well drained soils on low ridges and convex divides on the uplands near the major drainageways. The Foreston series consists of moderately well drained soils on slightly convex interstream divides near shallow drainageways. STORM DRAINAGE DESIGN The primary stormwater measures for this phase of the project will be a wet detention basin. The stormwater will be conveyed via overland sheet flow and a closed conduit system to the proposed wet detention basin that will be designed to treat the first 1.5" of rainfall and to control the peak runoff from the 10-year storm event. The site drains to an unnamed tributary of Mullet Run (classification SA, HQW) but is greater than'/a mile as verified by a Water Classification Request. Drainage Area WET DETENTION BASIN Drainage Area 1,046,055 sf Drainage Area 24.01 ac Impervious Area Calculation Lots 258,436 sf Sidewalk 7,400 Pavement 81,199 Future 60,300 Total 407,335 sf Total 9.35 ac % Impervious 38.9% Volume/Storage Calculation Design Storm (P) Schueler Method Runoff Coeff (RV) Required Volume (Vreq) 1.5 in 0.40 RV = %IMP'0.009+0.05 52,363 cf Vreq = (P/12)'RV'DA WET DETENTION POND CONTOUR INCR ACCUM CONTOUR AREA VOL VOL [sq ft] [cu ft] [cu ft] 14.0 10888 0 0 15.0 12593 11,741 11,741 16.0 14363 13,478 25,219 17.0 16196 15,280 40,498 18.0 18090 17,143 57,641 19.0 20044 19,067 76,708 20.0 22058 21,051 97,759 20.5 25543 11,900 109,659 FOREBAY CONTOUR INCR ACCUM CONTOUR AREA VOL VOL [sq ft] [cu ft] [cu ft] 15.0 2711 0 0 16.0 3561 3,136 3,136 17.0 4473 4,017 7,153 18.0 5444 4,959 12,112 19.0 6476 5.960 18,072 20.0 7564 7,020 25,092 20.5 8130 3,924 29,015 Ape" pool 33,673 Ashen bottom 29,622 VOLUME Ape" pool Ashelt bottom Apond bottom Apond bottom 10,888 Total 138,674 33,673 29,622 10,888 Depth 6.0 PROVIDED FOR FOREBAY 20.9% 1.5" STORAGE CONTOUR INCR ACCUM CONTOUR AREA VOL VOL [sq ft] [cu ft] [cu ft] 20.5 33673 0 0 21.0 39683 18,339 18,339 21.84 41633 34,153 52,492 daverage 4.5726 POND RELEASE TIME FOR CONTROL PIPE: POND 2 POND RELEASE TIME FOR CONTROL PIPE: STORAGE ORIFICE STORAGE OUTFLOW RELEASE ELEVATION ELEVATION VOLUME RATE TIME (FT) (FT) (CF) (CFS) (HOURS) 21.84 20.50 52,492 0.281 51.9 TOTAL HOURS 51.9 DAYS 2.16 CONTROL PIPE: 4 INCH ORIFICE HOLE USED ORIFICE EQUATION TO DETERMINE OUTFLOW RATE Q = Cd*A*(2gh)^1 /2 ,Hydrograph Summary Report Hydraflow Hydrographs by Intelisolve v9.1 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time Interval (min) Time to peak (min) Hyd. volume (cult) Inflow hyd(s) Maximum elevation (ft) Total strge used (cuft) Hydrograph description 1 SCS Runoff 65.14 1 725 206,564 ---- ---- ---- WET DETENTION BASIN 2 Reservoir 11.91 1 754 184,368 1 22.62 84,660 WET DETENTION BASIN 2015-04-20 PHASE 2 WET POND.gpw Return Period: 10 Year Wednesday, May 4, 2016 Hydrograph Report K, Hydratlow Hydrographs by Intelisolve At Hyd. No. 1 WET DETENTION BASIN Hydrograph type = SCS Runoff Storm frequency = 10 yrs Time interval = 1 min Drainage area = 24.010 ac Basin Slope = 0.0 % Tc method = USER Total precip. = 6.30 in Storm duration = 24 hrs Composite (Area/CN) = I(9.350 x 98) + (14.660 x 39)1 124.010 Q (cfs) 70.00 60.00 A61811A 40.00 30.00 20.00 10.00 WET DETENTION BASIN Hyd. No. 1 -- 10 Year Wednesday, May 4, 2016 Peak discharge = 65.14 cfs Time to peak = 725 min Hyd. volume = 206,564 cuft Curve number = 62" Hydraulic length = 0 ft Time of conc. (Tc) = 5.00 min Distribution = Type III Shape factor = 484 Q (cfs) 70.00 50.00 [I11091 30.00 20.00 10.00 000 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time (min) - 3 Hydrograph Report Hydraflow Hydrographs by Intelisolve v9.1 Wednesday, May 4, 2016 Hyd. No. 2 WET DETENTION BASIN Hydrograph type = Reservoir Peak discharge = 11.91 cfs Storm frequency = 10 yrs Time to peak = 754 min Time interval = 1 min Hyd. volume = 184,368 cuft Inflow hyd. No. = 1 -WET DETENTION BASIN Max. Elevation = 22.62 ft Reservoir name = WET DETENTION BASIN Max. Storage = 84,660 cuft Storage Indication method used. Q (cfs) 70.00 50.00 40.00 30.00 20.00 10.00 WM WET DETENTION BASIN Hyd. No. 2 -- 10 Year Q (cfs) 70.00 6Y11I1I11 40.00 30.00 1KII11<1Ir; 10.00 0 300 600 900 1200 1500 1800 2100 2400 2700 3000 Time (min) — Hyd No. 2 —Hyd No. 1 F T Total storage used = 84,660 tuft ,Fond Report 4 Hydraflow Hydrographs by Intelisolve v9.1 Wednesday, May 4, 2016 Pond No. 1 - WET DETENTION BASIN Pond Data contours - User -defined contour areas. Conic method used for volume calculation. Begining Elevation = 20.50 ft Stage / Storage Table Stage (ft) Elevation (ft) 0.00 20.50 0.50 21.00 1.50 22.00 2.50 23.00 3.50 24.00 4.50 25.00 5.50 26.00 Contour area (sgft) 33,673 37,894 42,009 44,393 46,832 49,329 51.882 Incr. Storage (cult) 0 17,880 39,930 43,191 45,602 48,070 50,595 Total storage (cult) 0 17,880 57,809 101,001 146,603 194,673 245,269 Culvert I Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise (In) - 24.00 4.00 0.00 0.00 Crest Len (ft) = 16.00 6.00 0.00 0.00 Span (In) = 24.00 4.00 0.00 0.00 Crest El. (ft) = 22.69 21.84 0.00 0.00 No. Barrels = 1 1 0 0 Weir Coeft. = 3.00 3.00 3.33 3.33 Invert El. (ft) - 20.45 20.50 0.00 0.00 Weir Type = Riser Broad --- -- Length (ft) - 104.00 0.00 0.00 0.00 Multi -Stage = Yes Yes No No Slope (%) = 1.00 0.00 0.00 n/a N-Value = .010 .013 .013 n/a Orifice CoeN. = 0.60 0.60 0.60 0.60 Exfil.(inlhr) = 0.000 (by Contour) Multi -Stage = nla Yes No No TW Elev. (fill = 0.00 Note. Culver i6ce ororms are analyzed under inlet rc) and outlet led) control, Weir nears checked for entice conditions (o) and submergence (s). Stage I Storage I Discharge Table Stage Storage Elevation Clv A CIv B clv C PrfRsr Wr A Wr B Wr C Wr D Exfil User Total ft cuft ft cfs cfs cfs cfs cfs cfs cfs cfs cis cis cfs 0.00 0 20.50 0.00 0.00 -- -- 0.00 0.00 --- -- -- --- 0.00 0.05 1,788 20.55 0.02 is 0.01 is --- --- 0.00 0.00 --- -- -- --- 0.01 0.10 3,576 20.60 0.03 is 0.02 is --- --- 0.00 0.00 --- --- -- --- 0.02 0.15 5,364 20.65 0.06 is 0.05 is --- 0.00 0.00 --- --- --- --- 0.05 0.20 7,152 20.70 0.08 is 0.08 is --- -- 0.00 0.00 --- --- - -- 0.08 0.25 8,940 20.75 0.12 is 0.12 is --- 0.00 0.00 --- --- --- -- 0.12 0.30 10,728 20.80 0.16 is 0.15 is -- --- 0.00 0.00 --- --- --- -- 0.15 0.35 12,516 20.85 0.18 is 0.18 is --- --- 0.00 0.00 -- -- - -- 0.18 0.40 14,304 20.90 0.20 is 0.20 is -- --- 0.00 0.00 --- --- 0.20 0.45 16,092 20.95 0.22 is 0.22 is --- --- 0.00 0.00 --- -- - --- 0.22 0.50 17,880 21.00 0.24 is 0.24 is --- --- 0.00 0.00 --- --- --- --- 0.24 0.60 21,873 21.10 0.29 is 0.28 is -- --- 0.00 0.00 --- --- --- --- 0.28 0.70 25,866 21.20 0.32 is 0.31 is -- -- 0.00 0.00 -- --- -- -- 0.31 0.80 29,859 21.30 0.35 is 0.33 is --- --- 0.00 0.00 --- --- --- --- 0.33 0.90 33,852 21.40 0.35 is 0.35 is --- --- 0.00 0.00 -- --- --- --- 0.35 1.00 37,845 21.50 0.38 is 0.38 is --- --- 0.00 0.00 --- --- --- --- 0.38 1.10 41,837 21.60 0.41 is 0.40 is -- -- 0.00 0.00 -- --- -- --- 0.40 1.20 45,830 21.70 0.44 is 0.42 is --- -- 0.00 0.00 --- --- --- --- 0.42 1.30 49,823 21.80 0.44 is 0.44 is --- --- 0.00 0.00 --- --- --- --- 0.44 1.40 53,816 21.90 0.73 is 0.44 is --- --- 0.00 0.26 -- -- - --- 0.71 1.50 57,809 22.00 1.58 iC 0.43 is --- -- 0.00 1.15 -- -- - -- 1.58 1.60 62,129 22.10 2.81 iC 0.41 is --- --- 0.00 2.39 -- -- 2.80 1.70 66,448 22.20 4.30 is 0.39 is --- --- 0.00 3.89 --- --- --- --- 4.28 1.80 70,767 22.30 6.06 is 0.37 is -- - 0.00 5.62 -- --- ----- 5.99 1.90 75,086 22.40 7.96 is 0.35 is -- -- 0.00 7.54 --- --- - -- 7.90 2.00 79,405 22.50 10.00 is 0.33 is --- - 0.00 9.57 s --- --- --- --- 9.90 2.10 83,724 22.60 11.58 is 0.31 is --- --- 0.00 11.27 s -- --- --- --- 11.58 2.20 88,043 22.70 13.11 is 0.30 is --- --- 0.05 12.76 s --- --- ------ 13.11 2.30 92,362 22.80 15.07 is 0.25 is --- --- 1.75 13.06 s -- --- --- -- 15.06 2.40 96,681 22.90 16.85 is 0.19 is --- --- 4.62 s 12.04 s --- --- --- --- 16.85 2.50 101,001 23.00 10.02 is 0.15 is --- --- 6.63 s 11.23 s --- --- --- --- 18.02 2.60 105,561 23.10 18.89 is 0.13 is --- --- 8.05 s 10.72 s --- --- -- -- 18.89 2.70 110,121 23.20 19.63 is 0.11 is -- --- 9.17 s 10.35 s -- -- -- -- 19.63 2.80 114,681 23.30 20,29 is 0.09 is --- --- 10.11 s 10.085 --- --- -- -- 20.29 2.90 119,242 23.40 20.91 is 0.08 is --- --- 10.92 s 9.88 s -- --- --- --- 20.89 3.00 123,802 23.50 21.49 is 0.07 is -- - 11.66 s 9.75 s -- --- --- --- 21.48 3.10 128,362 23.60 22.04 is 0.07 iC --- -- 12.32 s 9.65 s -- --- --- -- 22.04 3.20 132,922 23.70 22.58 is 0.06 is -- --- 12.91 s 9.57 s --- --- --- --- 22.54 Continues on next page... 5 WET DETENTION BASIN Stage I Storage/ Discharge Table Stage Storage Elevation CIvA CIvB CIvC PrfRSr WrA WrB WrC WrD Exfll User Total ft cuft ft cis cis cis cfs cis cis cis cis cis On cis 3.30 137,483 23.80 23.10 is 0.06 is -- - 13.48 s 9.54 s -- -- -- --- 23.08 3.40 142,043 23.90 23.60 is 0.05 is --- --- 14.00 s 9.51 s --- --- --- --- 23.56 3.50 146,603 24.00 24.09 is 0.05 is --- --- 14.52 s 9.51 s --- --- --- --- 24.08 3.60 151,410 24.10 24.57 is 0.05 is -- -- 14.98 s 9.51 s --- - -- --- 24.53 3.70 156,217 24.20 25.03 is 0.04 is --- --- 15.41 s 9.51 s --- --- --- --- 24.97 3.80 161,024 24.30 25.49 is 0.04 is --- --- 15.87 s 9.55 s --- - -- -- 25.46 3.90 165,831 24.40 25.94 is 0.04 is -- - 16.26 s 9.57 s -- --- --- --- 25.87 4.00 170,638 24.50 26.38 is 0.04 is --- --- 16.68 s 9.61 s --- --- --- - 26.33 4A0 175,445 24.60 26.81 is 0.04 is -- -- 17.07 s 9.65 s -- - -- -- 26.76 4.20 180,252 24.70 27.24 is 0.03 is --- --- 17.46 s 9.70 s --- - --- -- 27.20 4.30 185,059 24.80 27.66 is 0.03 is --- --- 17.75 s 9.71 s --- -- --- --- 27.48 4.40 189,866 24.90 28.07 is 0.03 is --- --- 18.18 s 9.80 s --- - -- --- 28.01 4.50 194,673 25.00 28.48 is 0.03 is - 18.54 s 9.86 s -- --- --- -- 28.43 4.60 199,733 25A 0 28.88 is 0.03 iC --- -- 18.82 s 9.89 s --- --- -- -- 28.74 4.70 204,792 25.20 29.27 is 0.03 iC -- - 19.19 s 9.96 s --- - -- --- 29.18 4.80 209,852 25.30 29.66 is 0.03 is --- --- 19.49 s 10.01 s --- --- --- --- 29.52 4.90 214,911 25.40 30.05 io 0.03 is --- --- 19.72 s 10.03 s --- -- --- --- 29.77 5.00 219,971 25.50 30.42 1c 0.02 is -- -- 20.10 s 10.12 s -- - -- - - 30.25 5.10 225,030 25.60 30.80 is 0.02 is --- --- 20.43 s 10.20 s --- --- -- --- 30.65 5.20 230,090 25.70 31.17 is 0.02 is --- --- 20.71 s 10.25 s -- -- -- --- 30.98 5.30 235,149 25.80 31.53 is 0.02 is -- - 20.93 s 10.27 s -- --- --- --- 31.22 5.40 240,209 25.90 31.90 is 0.02 is --- --- 21.39 s 10.42 s -- --- --- --- 31.83 5.50 245,269 26.00 32.25 is 0.02 is -- - 21.50 s 10.41 s -- -- --- --- 31.93 ...End Storm Sewer Tabulation • Page f Station Len Dmg Area Rnoff Area x C Tc Rain Total Cap Vel Pipe Invert Elev HGL Elev Gmd / Rim Elev Line ID Incr Total coeff (1) Row full Line 7o Incr Total Inlet Syst Size Slope Dn Up Dn Up Dn Up Line (fill (ac) (ac) (C) (min) (min) (init r) (cfs) (cfs) (ft/s) (in) (%) (ft) (it) (ft) (ft) (it) (ft) 1 End 254 0.00 5.35 0.00 0.00 3.52 5.0 10.5 6.2 21.92 70.51 4.73 36 0.66 19.70 21.38 22.46 22.87 0.00 27.39 2-1 2 1 43 0.00 5.35 0.00 0.00 3.52 5.0 10.3 6.3 22.05 16.26 4.49 30 0.09 21 A0 21.44 23.90 23.94 27.39 27.39 3-2 3 2 86 0.51 5.35 0.78 0.40 3.52 5-0 9.8 6.3 22.20 23.70 4.52 30 0.20 21.44 21.61 24.25 24.40 27.39 26.57 4-3 4 3 204 0.51 4.33 0.70 0.36 2.72 5.0 8.7 6.3 17A8 23.90 3.50 30 0.20 21.61 22.02 25.01 25.22 26.57 26.79 5-4 5 4 212 0.80 3.31 0.70 0.56 2.01 5.0 7.5 6.3 12.68 16.14 4.04 24 0.30 22.02 22.66 25.50 25.90 26.79 26.90 6-5 6 5 100 0.00 1.78 0.00 0.00 0.98 5.0 6.9 6.3 6.20 16.10 1.97 24 0.30 22.66 22.96 26.47 26.52 26.90 27.49 7-6 7 6 100 0.19 1.78 0.57 0.11 0.98 &0 6.4 6.3 6.20 16.10 1.97 24 0.30 22.96 23.26 26.54 26.59 27.49 27.72 8-7 8 7 103 0.00 1.42 0.00 0.00 0.73 5.0 5.8 6.3 4.63 7.49 2.62 18 0.30 23.26 23.57 26.68 26.80 27.72 28.67 9-8 9 8 108 0.20 1.42 0.74 0.15 0.73 5.0 5.2 6.3 4.63 4.57 3.77 15 0.30 23.57 23.89 26.84 27.17 28.67 27.82 10-9 10 9 35 1.22 1.22 0.48 0.59 0.59 5.0 5.0 6.3 3.69 4.71 3.01 15 0.31 23.89 24.00 27.58 27.65 27.82 27.82 11-10 11 3 35 0.51 0.51 0.78 0.40 0.40 5.0 5.0 6.3 2.51 4.71 2.04 15 0.31 21.61 2112 25.13 25.16 26.57 26.57 12-4 0.70 0.36 0.36 5.0 5.0 6.3 2.25 4.71 1.83 15 0.31 22.02 22.13 25.64 25.67 26.79 26.79 13-5 12 4 35 0.51 0.51 13 5 35 0.73 0.73 0.64 0.47 0.47 5.0 5.0 6.3 2.95 4.71 2.40 15 0.31 22.66 22.77 26.44 26.49 26.90 26.90 14-6 14 7 35 0.17 0.17 0.83 0.14 0.14 5.0 5.0 6.3 0.89 4.71 0.73 15 0.31 23.25 23.37 26.73 26.73 27.72 27.72 15-8 Project File: 2015-02-06 STORM 15-t.stm Number of lines: 14 Run Date: 03-23-2015 NOTES: Intensity = 121.80 / (Inlet time + 23.50) " 0.84; Return period = 10 Yrs. ; c = cir e = ellip b = box Hydrafim Storm Sewers 2008 vt 2 01 Storm Sewer Tabulation Page t Station Len Drng Area Rnoff Area x C Tc Rain Total Cap Val Pipe Invert Elev HGL Elev Gmd / Rim Elev, Line ID -• Incr Total coeff (I) flow full Line To LLine Incr Total Inlet Syst Size Slope Dn Up Dn Up Dn Up (ft) (ac) (ac) (C) (min) (min) (in/hr) (cfs) (cfs) (fUs) (in) N (ft) (ft) (ft) (ft) (ft) (ft) 1 End 254 0.00 4.28 0.00 0.00 2.66 5.0 8.4 6.3 16.80 68.60 4.08 36 0.63 19.70 21.29 22.46 22.60 0.00 27.39 17-16 2 1 43 0.00 4.28 0.00 0.00 2.66 5.0 8.2 6.3 16.80 29.32 5.29 30 0.30 21.31 21.44 22.92 22.92 27.39 27.39 18-17 3 2 95 0.51 4.28 0.78 0.40 2.66 5.0 7.7 6.3 16.80 23.84 3.80 30 0.20 21.44 21.63 23.62 23.69 27.39 26.55 19-18 4 3 200 0.56 3.26 0.74 0.41 1.87 5.0 6.6 6.3 11.78 16.10 3.75 24 0.30 21.63 22.23 24.06 24.38 26.55 26.55 20-19 5 4 158 0.00 1.71 0.00 0.00 0.96 5.0 5.7 6.3 6.05 16.04 1.92 24 0.30 22.23 22.70 24.87 24.93 26.55 27.42 21-20 6 5 88 0.86 1.71 0.65 0.56 0.96 5.0 5.2 6.3 6.05 4.56 4.93 15 0.30 22.70 22.96 24.95 25.40 27.42 26.55 22-21 7 6 35 0.85 0.85 0.47 0.40 0.40 5.0 5.0 6.3 2.52 4.71 2.05 15 0.31 22.96 23.07 26.28 26.31 26.55 26.55 23-22 8 3 35 0.51 0.51 0.78 0.40 0.40 5.0 5.0 6.3 2.51 4.71 2.04 15 0.31 21.63 21.74 24.21 24.24 26.55 26.55 24-19 9 4 35 0.99 0.99 0.50 0.50 0.50 5.0 5.0 6.3 3.12 4.71 2.54 15 0.31 22.23 22.34 24.82 24.87 26.55 26.55 25-20 Project File: 2015-02-03 STORM 25-16.stm Number of lines: 9 Run Date: 03-23-2015 NOTES: Intensity = 121.80 / (Inlet time + 23.50) " 0.84; Return period = 10 Yrs. ; c = cir e = ellip b = box F1y42flOw Srotpl Sewers zwo vi zvi Storm Sewer Tabulation Page 1 Station Len Drng Area Rnoff Area x C Tc Rain Total Cap Val Pipe Invert Elev HGL Elev Gmd I Rim Elev Line ID ' Incr Total coeff (1) flow full Line To Incr Total Inlet Syst Size Slope Dn Up On Up On Up Line (ft) (ac) (ac) (C) (min) (min) (inlhr) (cfs) (cfs) (fUs) (in) N (it) (ft) (ft) (ft) (it) (ft) 1 End 179 0.58 2.87 0.61 0.35 1.72 5.0 5.6 6.3 10.87 12.41 3.46 24 0.30 19.96 20.50 22.46 22.87 0.00 24.58 27-26 2 1 90 1.24 2.29 0.52 0.64 1.37 5.0 5.1 6.3 8.64 12.37 2.75 24 0.30 20.50 20.77 23.04 23.17 24.58 24.80 28-27 3 2 25 1.05 1.05 0.69 0.72 0.72 5.0 5.0 6.3 4.57 5.98 2.59 18 0.32 20.77 20.85 23.36 23.40 24.80 24.80 29-28 Project File: 2015-01-01 STORM 29-26.stm Number of lines: 3 Run Date: 03-23-2015 NOTES: Intensity = 121.801 (Inlet time + 23.50) ^ 0.84; Return period = 10 Yrs. : c = cir e = ellip b = box Hydrem Storm Sewers 2008 vrtm ECS CAROLINAS, LLP 'Sertlrzymr?Ste-rnfardfor Swvlaa' Z =. . G^7techrnral • ConsinictJon Malarial. • srtarnnmrnrai • Facilities e February 10, 2014 Mr. Gary Pape, P.E. GSP Consulting, PLLC 6626 Gordon Road Wilmington, North Carolina 28411 Reference: Report of Seasonal High Water Table Estimation The Oaks at Sloop Point PH 2 Sloop Point, Pender County, North Carolina ECS Project No. 22.20203 Dear Mr. Pape: ECS Carolinas, LLP (ECS) recently conducted an estimation of the Seasonal High Water Table (SHWT) for the proposed stormwater best management practice (BMP) areas at the Oaks at Sloop Point PH 2 in Sloop Point, Pander County, North Carolina. This letter, with attachments, is the report of our estimation. Field Testing On February 5, 2014, ECS conducted an exploration of the subsurface soil and SHWT conditions at one requested location shown on the attached Boring Location Plan (Figure 1). The purpose of this exploration was to estimate the SHWT of the in place soils for the design of for the proposed stormwater BMP area. ECS met with Mr. Garry Pape on site in order to locate the boring. ECS explored the subsurface soil and groundwater conditions by advancing one hand auger boring into the existing ground surface at the requested boring location. ECS visually classified the subsurface soils and obtained representative samples of each soil type encountered. ECS recorded the SHWT and groundwater level observed at the time of the hand auger boring. The attached SHWT sheet provides a summary of the subsurface conditions encountered at the hand auger boring location. The groundwater level and the SHWT were estimated at the boring location below the existing grade elevation. Below is a summary of each boring location. _-- G 7UA1 Lt7caI1"�i't� _ — ,af. _ SM'fVU7t.— __ GroutldvJatel`s ,! - B-1 40 inches 65 inches The SHWT may vary within the proposed site due to changes in subsurface conditions and elevation. i':nP. Ril it t- i. V� bmr•r;b •n ^lLf'-11 r; '. r ...- • t 7 .: !<il) n"n+y;:�rr:r•i-N !.• .r:, Report of SHWT Estimation ` The Oaks at Sloop Point Ph 2 Sloop Point, Ponder County, North Carolina ECS Project No. 22.20203 February 10, 2014 Closure The activities and evaluative approaches used in this assessment are consistent with those normally employed in assessments of this type. Our testing of site conditions has been based on our understanding of the project information and the data obtained during our field activities. ECS appreciates the opportunity to provide our services to you on this project. If you have any questions concerning this report or this project, please contact us at (910) 686-9114. Respectfully, ECS CAROLINAS, LLP I kw�� K. Brooks Wall Project Geologist Attachments: Boring Location Plan SHWT sheet q, ?4—� Kris J. Stamm Principal nY i'}�'WI.�•t'��r r � e. ��. r•. 71)%��I lPi .I��yj`9Y����� ti� .- I�M ;. ti —Y .-.di ..'y,;,I��_.}} •,.�. n ..,1 _.,I .IIy,I.�nrn'�11ys�.'nIJ: �I�,.M y� y{, j ••h:C .l, °' '� 111 '1... L J II {I .. jI �.�•IJ l L J: •--/in/ 'C1. 1 �Y �ff I I � I 0 APPROXIMATE BORING LOCATION NOT TO SCALE The Oaks at Sloop Point PH2 Sloop Point, Ponder County, North Carolina ECS Project # 20203 February 5, 2014 KBW Figure 1— Boring Location Plan Provided by: GSP Consulting Ll Seasonal High Water Table Estimation The Oaks at Sloop Point Ph 2 Sloop Point, Pender Co., North Carolina ECS Project No. 22.20203 February 10, 2014 Location Depth B-1 0-20" 20"-32" 32"-48" 48"-70" Soil Description Brown silty SAND Gray fine SAND w silt Gray/orange clayey SAND Gray/orange fine SAND w silt Seasonal High Water Table was estimated to be at 40 inches below the existing grade elevation. Groundwater was encountered at 65 inches below the existing grade elevation. GSP CONSULTING September 18, 2015 Pender County Planning and Community Development 805 S. Walker Street Burgaw, NC 29425 Re: Wyndwater — Phase 2B Project Narrative Dear Mr. Meredith: 404'J(r sf 1 This phase of the Wyndwater project is a revision to the previously approved Phase 2. This phase of the project will increase the total unit count of Phase 2 from 56 lots to 63 lots. This phase of the project will also include a Public waterline extension and a sewer main extension that will be owned and maintained by Pluris, LLC. The primary stormwater measures for this site will be a closed conduit system that will direct the runoff to a proposed wet detention basin that will be designed to control the peak runoff from the 10-year storm event and will be analyzed for the 100-year storm event to prevent flooding of the proposed development. This project will require approvals from DENR-Public Water Supply Section for the water line extension, NCDOT for the subdivision street, NCDENR-Division of Water Resources for the sewer extension & NCDENR-Division of Energy, Mineral and Land Resources for Stormwater & Erosion & Sediment Control. The traffic for this phase of the development are estimated to be approximately 603 total daily trips with 47 in the AM peak hour and 64 in the PM peak hour based on the ITE Trip Generation Manual 81h edition using ITE Code 210 for single family homes. Please contact me immediately at (910) 442-7870 or gpape@asp-consultingcom if you have any questions or require additional information. Sincerely, GSP CONSULTING, PLLC. Garry S. 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