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HomeMy WebLinkAboutSW8070243_CURRENT PERMIT_20071018STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW 00-I0M3 DOC TYPE � CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE o�F.v - 7/OI.Y YYYYMMDD W A 7-F,4oG r October 18, 2007 Michael F Easley, Go%emor William G Ross 3r, Secretary North Carolina Department orEnwonment and Natural Resources Mr Michael Merritt, Member/Manager Canopy Group, LLC 141 A Old Fayetteville Road Leland, NC 28451 Subject Stormwater Permit No SW8 070243 (replaces SW8 060134) Oak Creek at Maritime Shores Low Density Subdivision with a Curb Outlet System and a Pocket of High Density Brunswick County Dear Mr Merritt Coleen H Sullins Director Division of Water Quality The Wilmington Regional Office received a complete Stormwater Management Permit Application for Oak Creek at Maritime Shores on October 4, 2007 Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth 1n Title 15A NCAC 2H 1000 We are forwarding Permit No SW8 070243, dated October 18, 2007, for the construction of the subject project Permit No SW8 060134, issued February 16, 2006, is rescinded effective October 18, 2007, and is replaced with Permit No SW8 070243 Please discard previously approved plans under the old permit with the approved, attached plans for Permit No SW8 070243 Permit No 070243 modifies the rescinded permit by (a) adding Phase 2 and Pond #2, (b) increasing total project area (Phases 1 plus 2) from 25 68 ac to 30 61 ac, (c) increasing built -upon area from 234,657 to 379,132 sq ft (Phases 1 plus 2), (d) increasing the number of lots from 50 to 55 (with no change to 4,037 sq ft of allowable built -upon area per lot), (e) changing the signing official to Michael Merritt, and (f) changing Pond #1 orifice diameter to 1 0 inches This permit shall be effective from the date of issuance until February 16, 2016, and shall be subject to the conditions and limitations as specified therein, and does not supercede any other agency permit that may be required If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adludicatory hearing upon written request within sixty (60) days following receipt of this permit This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P O Drawer 27447, Raleigh, NC 27611-7447 Unless such demands are made this permit shall be final and binding If you have any questions, or need additional information concerning this matter, please contact either Paul Bartlett at 19) 733-5083 X235 or me at (910) 796-7215 Sinc I Ed a eck Regional Supervisor Surface Water Protection Section ENBlptb S 1WQSISTORMWATERIPERMIT1070243 oct07 cc K Davis Fennell, P E , Cape Fear Engineering, Inc Delaney Aycock, Brunswick County Building Inspections Jeff Phillips, Brunswick County Engineering David Thomas, NCDOT Paul T Bartlett, P E Wilmington Regional Office one Central Files No hCarolina atura!W North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone (910) 796-7215 Customer Service Wilmington Regional Office lnlemet www ncwaterQuahty org Fax (910) 350-2004 1-877 623-6748 An Equal Opportunity/Affirmative Action Employer— 50% Recycled110% Post Consumer Paper State Stormwater Management Systems Permit No SW8 070243 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT LOW DENSITY DEVELOPMENT WITH A CURB OUTLET SYSTEM AND A POCKET OF HIGH DENSITY In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules and Regulations PERMISSION IS HEREBY GRANTED TO Michael Merritt and Canopy Group, LLC Oak Creek at Mantime Shores Brunswick County FOR THE construction, operation and maintenance of two wet detention basins for pockets of high density and a 30% low density subdivision with a curb outlet system in compliance with the provisions of 15A NCAC 2H 1000 (hereafter referred to as the "stormwater rules`j and the approved stormwater management plans and specifications, and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit Permit No SW8 060134, issued February 16, 2006, is rescinded effective October 18, 2007, and is replaced with Permit No SW8 070243 Permit No 070243 modifies the rescinded permit by (a) adding Phase 2 and Pond #2, (b) increasing total protect area (Phases 1 plus 2) from 25 68 ac to 30 61 ac, (c) increasing built -upon area from 234,657 to 379,132 sq ft (Phases 1 plus 2), (d) increasing the number of lots from 50 to 55 (with no change to 4,037 sq ft of allowable built -upon area per lot), (e) changing the signing official to Michael Merritt, and (f) changing Pond #1 orifice diameter to 1 0 in This permit shall be effective from the date of issuance until February 16, 2016 and shall be subject to the following specified conditions and limitations I. DESIGN STANDARDS The project is permitted for 55 lots Built -upon area per lot is limited to 4,037 square feet, as defined by the stormwater rules, and as indicated in the approved plans 2 The overall tract built -upon area percentagge for the project must be maintained at 30%, per the requirements of Section 1005 of the stormwater rules This permit covers the construction of 379,132 square feet of built -upon area for Phases 1 and 2 total There is no built -upon area available for future development draining to the wet detention ponds in this permit 3 This project proposes a curb outlet system Each designated curb outlet swale or 100' vegetated area shown on the approved plans must be maintained at a minimum of 100' long, maintain 5 1 �H V) side slopes or flatter, have a longitudinal slope no steeper than 5 /o, carry the flow from a 10 year storm in a non -erosive manner, maintain a dense vegetated cover, and be located in either a dedicated common area or a recorded drainage easement Page 2 of 9 State Stormwater Management Systems Permit No SW8 070243 4 No piping shall be allowed except as shown on the approved drawings for the pockets of high density and those minimum amounts necessary to direct runoff beneath an impervious surface such as a road or under driveways to provide access to lots 5 A stormwater system has been approved for the management of stormwater runoff from the pockets of high density, as described in Section 1 10 on page 3 of this permit 6 All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans 7 The runoff from all built -upon area associated with the amenity center area shall be directed to the permitted stormwater control system 8 Runoff conveyances other than the curb outlet system swales, such as perimeter ditches, must be vegetated with side slopes no steeper than 3 1 (H V) 9 Approved plans and specifications for projects covered by this permit are incorporated by reference and are enforceable parts of the permit 10 The following design elements have been permitted for the wet detention pond stormwater facility, and must be provided in the system at all times t '' ` Units Pond #1 Pond #2 Drainage Area Onsite Offstte Acres ft2 ft2 652 284,011 0 1 33 57,935 0 Total Impervious Surfaces Buildings Streets Sidewalks Other (Amenity) Offsite ft2 108,028 54,014 36,590 4,356 13,068 0 16,989 5,663 11,326 ' 0 Pond Depth feet 55 40 TSS removal efficiency % 90 90 Design Storm inches 1 1 Permanent Pool Elevation FMSL 370 450 Permitted Surface Area @PP ft2 8,511 4,314 Permitted Storage Volume ft3 31,933 2,172 Storage Elevation FMSL 400 4535 Controlling Orifice "0 pipe 10 075 Permanent Pool Volume ft3 18,104 5,407 Forebay Volume ft3 3,957 1,006 Maximum Fountain Horsepower HP 118 1/8 Receiving Stream Bishop Branch River Basin Cape Fear Stream Index Number 18-81-7-1 Classification of Water Body C, SW Page 3of9 State Stormwater Management Systems Permit No SW8 070243 II SCHEDULE OF COMPLIANCE 1 The wet detention ponds, curb outlet swales, vegetated areas and other vegetated conveyances shall be constructed in their entirety, vegetated, and be operational for their intended use prior to the construction of any built -upon surface, per the approved plans 2 During construction, erosion shall be kept to a minimum and any eroded areas of the swales or other vegetated conveyances will be repaired immediately 3 The permittee shall at all times provide the operation and maintenance necessary to operate the permitted stormwater management systems at optimum efficiency to include a Inspections b Sediment removal c MowinQ, and revegetating of the side slopes d Immediate repair of eroded areas e Maintenance of side slopes in accordance with approved plans and specifications f Cleaning and repair of catch basin grates, flumes, piping, outlet structure, orifice and the flow spreader mechanism 4 The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below a Any revision to the approved plans, regardless of size b Project name change c Transfer of ownership d Redesign or addition to the approved amount of built -upon area or to the drainage area e Further subdivision, acquisition or sale of the project area The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval was sought f Filling in, piping, or altering any vegetative conveyance shown on the approved plan 5 The Director may determine that other revisions to the project should require a modification to the permit 6 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 associated with the community center 7 Upon completion of construction, prior to issuance of a Certificate of Occupancy for the community center, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation Any deviations from the approved plans and specifications must be noted on the Certification 8 If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility Page 4 of 9 State Stormwater Management Systems Permit No SW8 070243 9 The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -upon area Once the lot transfer is complete, the built -upon area may not be revised without approval from the Division of Water Quality, and responsibility for meeting the built -upon area limit is transferred to the individual property owner, provided that the permittee has complied with the requirements of Section II 15 of this permit 10 The permittee must certify in writing that the project's stormwater controls, and impervious surfaces have been constructed within substantial intent of the approved plans and specifications Any deviation from the approved plans must be noted on the Certification The permittee shall submit the Certification to the Division within 30 days of completion of the project 11 The permittee shall submit all information requested by the Director or his representative within the time frame specified in the written information request 12 Each lot in the subdivision covered by this permit will maintain a minimum 30- foot wide vegetative buffer between all impervious areas and surface waters 13 All roof drains must terminate at least 30' from the Mean High Water mark 14 Deed restrictions are incorporated into this permit by reference and must be recorded with the Office of the Register of Deeds prior to the sale of any lot 15 Recorded deed restrictions must include, at a minimum, the following statements related to stormwater management a The following covenants are intended to ensure onggoing compliance with State Stormwater Management Permit Number SW$070243, as issued by the Division of Water Quality under NCAC 2H 1000 b The State of North Carolina is made a beneficiary of these covenants to the extent necessary to maintain compliance with the Stormwater Management Permit c These covenants are to run with the land and be binding on all persons and parties claiming under them d The covenants pertaining to stormwater may not be altered or rescinded without the express written consent of the State of North Carolina, Division of Water Quality e Alteration of the drainage as shown on the approved plans may not take place without the concurrence of the Division of Water Quality f The maximum built -upon area per lot for 55 lots is 4,037 square feet 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, driveways, and parking areas, but does not include raised, open wood decking, or the water surface of swimming pools g Filling in, piping or altering any 3 1 vegetated conveyances (ditches, swales, etc) associated with the development except for average driveway crossings, is prohibited by any persons h Filling in, piping or altering any designated 5 1 curb outlet swale or vegetated area associated with the development is prohibited by any persons i A 30' vegetated buffer must be maintained between all built -upon area and the Mean High Water line of surface waters 1 All roof drains shall terminate at least 30' from the Mean High Water mark k Each designated curb outlet swale or 100' vegetated area shown on the ap roved plan must be maintained at a minimum of 100' long, maintain 5 V) side slopes or flatter, have a longitudinal slope no steeper than 5%, carry the flow from a 10 year storm in a non -erosive manner, maintain a dense vegetated cover, and be located in either a dedicated common area or a recorded drainage easement Page 5 of 9 State Stormwater Management Systems Permit No SW8 070243 13 The permittee must submit a copy of the recorded deed restrictions within 30 days of the date of recording 14 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 15 Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ The records will indicate the date, activity, name of person performing the work and what actions were taken 16 Prior to transfer of the permit, the stormwater facilities will be inspected by DWQ personnel The facility must be in compliance with all permit conditions Any items not in compliance must be repaired or replaced to design condition prior to the transfer Records of maintenance activities performed to date will be required 17 The final plats for the project will be recorded showing all required swale easements and common areas, in accordance with the approved plans III GENERAL CONDITIONS Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to an enforcement action by the Division of Water Quality, in accordance with North Carolina General Statutes 143-215 6A to 143-215 6C 2 The permit issued shall continue in force and effect until revoked or terminated 3 The permit may be modified, revoked and reissued or terminated for cause The filing of a request for a permit modification, revocation and reissuance, or termination does not stay any permit condition 4 The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws, rules, and regulations contained in Title 15A of the North Carolina Administrative Code, Subchapter 2H 1000, and North Carolina General Statute 143-215 1 et al 5 The permit is not transferable to any person or entity except after notice to and approval by the Director The Director may require modification or revocation and reissuance of the permit to change the name and incorporate such other requirements as may be necessary A formal permit transfer request must be submitted to the Division of Water Quality accompanied by the appropriate fee, documentation from both parties involved, and other supporting materials as may be appropriate The approval of this request will be considered on its merits, and may or may not be approved The permittee is responsible for compliance with all the terms and conditions of this permit until the Division approves the permit transfer 6 The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances imposed by other government agencies (local, state and federal) which have jurisdiction If any of those permits or approvals result in revisions to the plans, a permit modification must be submitted Page 6of9 State Stormwater Management Systems Permit No SW8 070243 7 The permittee grants permission to DENR Staff to enter the property during business hours for the purposes of inspecting the stormwater control system and it's components 8 The permittee shall notify the Division of Water Quality of any name, ownership or mailing address changes within 30 days Permit issued this the 1 8th day of October 2007 NORT AROLINA ENVIRONMENTAL MANAGEMENT COMMISSION ----- -- �P�`'-------------..... for Coleen H Sullins, Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW8 070243 Page 7 of 9 State Stormwater Management Systems Permit No SW8 070243 Oak Creek at Maritime Shores Page 1 of 2 Stormwater Permit No SW8 070243 (replaces SW8 060134) Brunswick County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications The checklist of items on page 2 of this form are a part of this Certification Noted deviations from approved plans and specifications Signature Registration Number Date SEAL Page 8 of 9 State Stormwater Management Systems Permit No SW8 070243 Certification Requirements Page 2 of 2 1 The drainage area to the system contains approximately the permitted acreage 2 The drainage area to the system contains no more than the permitted amount of built -upon area 3 All the built -upon area associated with the project is graded such that the runoff drains to the system 4 All roof drains are located such that the runoff is directed into the system 5 The outlet/bypass structure elevations are per the approved plan 6 The outlet structure is located per the approved plans 7 Trash rack is provided on the outlet/bypass structure 8 All slopes are grassed with permanent vegetation 9 Vegetated slopes are no steeper than 3 1 10 The inlets are located per the approved plans and do not cause short- circuiting of the system 11 The permitted amounts of surface area and/or volume have been provided 12 Required drawdown devices are correctly sized per the approved plans 13 All required design depths are provided 14 All required parts of the system are provided, such as a vegetated shelf, a forebay, and the vegetated filter d 15 The required dimensions of the system are provided, per the approved plan cc NCDENR-DWQ Regional Office Delaney Aycock, Brunswick County Building Inspections Jeff Phillips, Brunswick County Engineering Page 9 of 9 D;T - -2 8-200 F13107_ 71624 tate of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION F z This form may he photocopied for use as an original cr, a IQ I. GENERAL INFORMATION: Ex I Applicant's name (specify the name of the corporation, individual, etc who owns the project) Canopy Group, L L C 2 Print Owner/Signing Official's name and title (person legally responsible for facility and compliance) Michael Merritt, Member/Manager 3 Mailing Address for person listed in item 2 above 141 A Old Fayetteville Road City Leland State NC Zip 28451 Telephone Number 910 616 1000 4 Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc ) Oak Creek at Maritime Shores Phase 2 5 Locahlan of Project (street address) 188 Old Town Creek Road City Town Creek County Brunswick 6 Directions to project (from nearest major intersection) About half a mile west of the intersection of Old Town Creek Road (SR # 1412) and US HWY 17 on the right 7 Latitude 34' 1 F 3 55" Longitude 78' 5' 38 85" of project 8 Contact person who can answer questions about the project Name Michael Merritt IT. PERMIT INFORMATION: I Specify whether project is (check one) New Telephone Number Form SWU-101 Version 3 99 Page 1 of 910 616 1000 Renewal X Modification 7..- be JI�C ca�d��� 2 If this application is being submitted as the result of a renewal or modification to an exis ing permit, list the existing permit number SW 8060134 And its issue date (if known) Feb 16, 2006 3 Specify the type of project (check one) Low Density X High Density Redevelop General Permit Other 4 Additional Project Requirements (check applicable blanks) CAMA Major X Sedimentation/Erosion Control X 404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748 III PROJECT INFORMATION I In the space provided below, summarize how stormwater will be treated Also attach a detailed narrative (one to two pages) describing stormwater management for the project Curb and gutter collection system with a wet detention pond for on -site treatment in addition to water quality swales 2 Stormwater runoff from this project drains to the Cape Fear River basin 3 Total Project Area 3061 acres 4 Project Built Upon Area 30 5 How many drainage basins does the project have? 9 6 Complete the following information for each drainage area If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below rverall� Pnd'IPhasejBasjn1lnfomafon # 1 Receiving Stream Name Bishop Branch Bishop Branch Receiving Stream Class C, Sw C Sw Drainage Area 1,333,372 sq ft 30 61 acres 284011 sq ft 6 52 acres Existing Impervious* Area 0 0 Proposed Impervious* Area 379,132 sq ft 8 71 acres 108028 sq ft 2 48 acres % Impervious* Area total 28 5% 38 0% 1m eruious4[Surfaceflrea ®v' u all . 4r,4" '1Pond„#,17'Phase 1� �W,�1! On -site Buildings-55@4037 sf 222,073 sq ft 5 10 acres 54014 sq ft 124 acres On -site Streets 132,422 sq ft 3 04 acres 36590 sq ft 0 84 acres On -site Parkin 0 included mother) 0 included in buildings) On -site Sidewalks 11,569 s ft 0 27 acres 4356 sq ft 0 10 acres Other on -site 13,068 sq ft 0 30 acres (amenity center) 13068 sq ft 0 30 acres (amenity center) Off site 0 0 Total '379,132 sq ft 8 71 acres I Total 108,028 sq ft 2 48 acres • Impervious area is defined as the built upon area including, but not limited to, buildings, roads parking areas, Sidewalks, gravel areas, etc Form SWU-101 Version 3 99 Page 2 of 6 d�0 J % &%l07 � kc,a0 we,, � 3 Su9 9 1 �©� •� � Basin Information Swale A Swale B Receiving Stream Name Bishop Branch Bishop Branch Receiving Stream Class C, SW C, SW Drainage Area 78,854 sq ft 1 81 acres 88,152 sq ft 2 02 acres Existing Impervious* Area 0 0 Proposed Impervious* Area 34,873 sq ft 0 80 acres 46628 sq ft 1 07 acres Impervious* Area total 44 2% 48 5% Impervious* Surface Area Swale A Swale B On-SLte Buildings 13117 sq ft 0 30 acres 14126 s ft 0 32 acres On -site Streets 20037 sq ft 0 46 acres 28750 sq ft 0 66 acres On-sLte Parking 0 0 On -site Sidewalks 1719 s ft 0 04 acres 3752sq ft 0 09 acres Other on -site 0 0 Off site 0 0 Total 34873 sq ft 0 80 acres Total 46628sq ft l 07 acres Basin Information SW-1 SW-2 Receiving Stream Name Bishop Branch Bishop Branch Receiving Stream Class C, SW C, SW Drainage Area 30,492 sq ft 0 70 acres 41,818 sq ft 0 96 acres Existing Impervious* Area 0 0 Proposed Impervious* Area 12,632 sq ft 0 29 acres 8,276 sq ft 0 19 acres Impervious * Area total 414% 19 8% Impervious* Surface Area SW-1 SW-2 On -site Buildings 2,178 sq ft 0 05 acres Osq ft 0 00 acres On -site Streets 10,454 sq ft 0 24 acres 8,276 sq ft 0 19 acres On -site Parking 0 0 On -site Sidewalks 0 0 Other on -site 0 0 Off site 0 0 Total 12,632 sq ft 0 29 acres Total 8,276 sq ft 0 19 acres Basin Information SW-3 SW-4 Receiving Stream Name Bishop Branch Bishop Branch Receiving Stream Class C, SW C, SW Drains a Area 20,909 sq ft 0 48 acres 42,689 sq ft 0 98 acres Existing Impervious* Area 0 0 Proposed Impervious* Area 6,099 sq ft 0 14 acres l 1,761 sq ft 0 27 acres % Impervious* Area (total) 29 2% 27 6% Impervious* Surface Area SW-3 SW-4 On -site Buildings 2,614 s ft 0 06 acres 3,920 sq ft 0 09 acres On -site Streets 3,485 sq ft 0 08 acres 7,841 sq ft 0 18 acres On -site Parking 0 0 On -site Sidewalks 0 0 Other on -site 0 0 Off site 0 0 Total 6,099 sq ft 0 14 acres Total 11,761 sq ft 0 27 acres Form SWU-101 Version 3 99 Page 3 of 6 -- 4w.sev-, _/ 4 Basin Information Entrance to Phase 1 (from Old Town Creek Rd ) Sheet Flow Areas Receiving Stream Name Bishop Branch Bishop Branch Receiving Stream Class C Sw C, SW Drainage Area 37,269 sq ft 0 86 acres 651,222 sq ft 14 95 acres Existing Impervious* Area 0 / V - 0 Proposed Impervious* Area 11,442 sq ft 0 26 acres 122,404 sq ft 2 81 acres % Impervious* Area (total) 30 2% 18 8% Impervious* Surface Area Entrance to Phase 1 (from Old Town Creek Rd Sheet Flow Areas On -site Buildings 4,037 sq ft 0 09 acres 122,404 sq ft 2 81 acres On -site Streets 5,663 sq ft 0 13 acres 0 sq ft 0 acres On -site Parking 0 0 On -site Sidewalks 1,742 sq ft 0 04 acres 0 Other on -site 0 0 Off site 0 0 Total 11,442 sq ft 0 26 acres Total 122,404 sq ft 2 81 acres Basin Information Pond #2 Phase 2 Receiving Stream Name Bishop Branch Receiving Stream Class C, SW Drainage Area 57,935 sq ft 133 acres Existing Impervious* Area 0 Proposed Impervious* Area 16,989 sq ft 0 39 acres Impervious* Area (total) 29 3% Impervious* Surface Area Pond #2 Phase 2 On -site Buildings 5,663 sq ft 0 13 acres On -site Streets 11,326 sq ft 0 26 acres On -site Parkin 0 On -site Sidewalks 0 Other on -site 0 Off site 0 Total 16,989 sq ft 0 39 acres 7 How was the off -site impervious area listed above derived? NIA Farm SWU-101 Version 3 99 Page 4 of 6 6-/7 r/0 7- v?a 24 3 IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS ** The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot If lot saes vary significantly, a table listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment The following covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality These covenants may not be changed or deleted without the consent of the State 2 No more than 4037 � square feet of any lot shall be covered by structures or impervious materials Impervious materials include asphalt gravel concrete brick, stone, slate or similar material but do not include wood decking or the water surface ofswimming pools 3 Swales shall not be filled in piped or altered except as necessary to provide driveway crossings 4 Built -upon area in excevs area of the permitted amount requires a state stormwater management permit modification prior to construction 5 All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land , that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Oft -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3 99 Pare 5 of 6 /L VI. SUBMITTAL REQUIREMEN S 076-2-43i Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ) A complete package includes all of the items listed below The complete application package should be submitted to the appropriate DWQ Regional Office. Please indicate that you have provided the following required information by initialing in the space provided next to each item Initials • Original and one copy of the Stormwater Management Permit Application Form MM • One copy of the applicable Supplement Form(s) for each BMP AA • Permit application processing fee of $420 (payable to NCDENR) alv, • Detailed narrative description of stormwater treatment /managementV • Two copies of plans and specifications, including -Development/Project name -Engineer and firm -Legend -North Arrow -Scale -Revision number & date -Mean high water line -Dimensioned property / project boundary -Location map with named streets or NCSR numbers -Original contours, proposed contours, spot elevations, finished floor elevations -Details of roads, drainage features, collection systems, and stormwater control measures -Wetlands delineated, or a note on plans that none exist -Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations -Drainage areas delineated -Vegetated buffers (where required) VII AGENT AUTHORIZATION If you wish to designate submittal authority to another individual or firm so that they may provide information on your behalf, please complete this section Designated agent (individual or firm) Cape Fear Engineering Mailing Address 151 Poole Road, Suite 100 City Phone Belville 910 383 1044 VIII. APPLICANT'S CERTIFICATION State NC Fax 910 383 1045 Zip 28451 I, (print or type name of person listed in General Information, item 2) Michael Merritt certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC 2H 1000 Signature Date � 01 Form SWU-101 Version 3 99 Pa-e 6 of 6 STATE OF NORTH CAROLINA BRUNSWICK COUNTY On this 22"d day of June, 2007, personally appeared before me, the said named Andrea Larkins to me known and known to me to be the person described in and who executed the foregoing instrument and she acknowledged that she executed the same and being duly sworn by me, made oath that the statements in the foregoing instrument are true My Commission Expires March 27, 2012 OFFICIAL SEAL l N.ge'l "ric - North CWDMa NEW ANOVER COUNTY Scott L40Kennedy, r H SCOTT KENNEDY.. JR Notary Public 08-07 07 11.57 FROk9-9103831045 9123821245 T-182 F002f007 F-994 & -le 7 — 0 ee D A, � 7" c� Ctip GENERAL POWER OF ATTORNEY BE IT KNOWN. that L ede and appointed, and by these presents does make and appoint Andrea S. Leg, true and lawful sUrney for him and in his name, place and stead, giving and granting to said attorney, genarat and limited paver and authority to do and perkrm all and every act and thing whatsoever requisite necessary to be done In and about the prwnlses as fully, to all Intents and purposes, as could be done N personally present, with fulf power or subetftutron and revocation, hereby ra*ing and confirming all that sold attorney shall lawhtl do or COU06 to be done by virtue Hereof, IN WAN t38 WHEREOF, I have hereunto set my hand and seal this kday 69�!t 20 State of North Carolina so County of Brunswick The foregoing instrument was acknowledged by me this day of 4ax- 2C9 By, Miatol L Merritt who Istare perimnaily known by me or who hawhava produced .tom as tdenllfication and who did not We an oatho-e- a,.,, i- u aOTA/q +� State a North G3rugna My CommWan Expires: March 27, 2012 '•.�U $ t o s Ci f ''�fi�wEg„Gtt������ 07a Permit No (Ft Zi p (to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM LOW DENSITY SUPPLEMENT This form may he photocopied for use as an original A low density project is one that meets the appropriate criteria for built upon area and transports stormwater runoff primarily through vegetated conveyances Low density projects should not have a discrete stormwater collection system as defined by 15A NCAC 2H 1002(18) Low density requirements and density factors can be found in 15A NCAC 2H 1005 through 1007 L PROJECT INFORMATION Project Name Contact Person Number of Lots Oak Creek Phase 2 Michael Merritt 55 Maritime Shores Phone Number 910 ) Allowable Built Upon Area Per Lot* 616-1000 4037 *If lot sizes are not uniform, attach a table indicating the number of lots, lot sizes and allowable built upon area for each lot The attachment must include the project name, phase, page numbers and provide area subtotals and totals II. BUILT UPON AREA See the Stormwater Management Permit Application for specific language that must be recorded in the deed restrictions for all subdivisions For uniform lot sizes, complete the following calculations in the space provided below where • SA Site Area - the total project area above Mean High Water Wetlands may be excluded when the development results in high density pockets • DF Density Factor - the appropriate percent built upon area dived by 100 • RA Road Area - the total impervious surface occupied by roadways • OA Other Area - the total area of impervious surfaces such as clubhouses, tennis courts, sidewalks, etc • No Lots - the total number of lots in the subdivision • BUA/Lot - the computed allowable built upon area for each lot including driveways and impervious surfaces located between the front lot line and the edge of pavement Form SWU-104 Rev 3 99 Page l of2 (o /�4° 7 �doe v n. -- cv 7d -:2-4 3 "coo Calculation (30 61* 3)-3 04-0 6 (SA x DF) - RA - OA = BUA No Lots Lots Overall Calculation = 0 1008 ac. = 4390 sq. ft. per Lot. {Covenants are Lmiting to 4037 sf/lot) 55 *OA = 0.30 acre for amenity center and 0.30 acre for sidewalks for total of 0.60 acres. III. REQUIRED ITEMS CHECKLIST Init►al in the space provided to indicate that the following requirements have been met and supporting documentation is provided as necessary If the applicant has designated an agent on the Stormwater Management Permit Application Form, the agent may initial below Applicants Initials ffi-,, -� Nk A a /&fO+ AXO b /4'YW 1\ d A 30 foot vegetative buffer is provided adjacent to surface waters Projects in the Neuse River basin may require additional buffers Deed restriction language as required on form SWU-101 shall be recorded as a restrictive covenant A copy of the recorded document shall be provided by DWQ within 30 days of platting and prior to sale of any lots Built upon area calculations are provided for the overall project and all lots Project conforms to low density requirements within the ORW AEC (it applicable) [15A NCAC 2H 1007(2)(b)] For»i SWU-104 Rev 3 99 Page 2 of 2 &0'7,69 -ZA Permit No /2-r/07- ,/,_��,�J(to be provided by DW r�,�c'o LL7J r ll' State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM CURB OUTLET SYSTEM SUPPLEMENT FOR LOW DENSITY DEVELOPMENT WITH CURB AND GUTTER This form may be pholocopted for use as an original DWQ Stormwater Management Plan Review A complete stormwater management plan submittal includes a stormwater management permit application, a curb outlet system supplement, a low density supplement, design calculations, and plans and specifications showing all stormwater conveyances and curb outlet details I. PROJECT INFORMATION Project Name Contact Person Oak Creek at Maritime Shores Phases 2 Michael Merritt Phone Number (910) 616-1000 Curb outlets to (check one) X Swale _ Vegetated Area II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the North Carolina Administrative Code Section 15A NCAC 2H 1008 Initial in the space provided to indicate that the following design requirements have been met and supporting documentation is attached If the applicant has designated an agent on the Stormwater Management Permit Application Form, the agent may initial below If a requirement has not been met, attach justification Applicants Initials a Curb outlets direct flow to a Swale or vegetated area b Swales or vegetated areas receiving curb outlet flow are designed to carry, at a minimum, the fL-�-U e -F AMA d e f g peak flow from the 10-year storm Flow velocity is non -erosive for peak flow from the 10-year storm event Longitudinal slope of the Swale or vegetated area does not exceed 5% Side slopes of the Swale or vegetated area are no steeper than 5 1 (horizontal to vertical) Length of Swale or vegetated are is > 100 feet The system takes into account the run-off at ultimate butlt-out potential from all surfaces draining to the system {delineate drainage area for each Swale) Swales are located in recorded drainage easements Grass type(s) for permanent vegetative cover specified on detail Swale detail provided on plan I'orm 5 WU-1 D5 Ver 3 99 PagL I of 3 7 — ✓ ee`,Y 4- Z- III DESIGN INFORMATION S-t,d 18 070 2-4-3 Complete the following table If additional space is needed the mlormation should be provided in the same format as Table 1 and attached to this form Rainfall intensity data can be found in Appendix 8 03 of the State of North Carolina Erosion and Sediment Conn of Planning and Design Manual Table I Swale Design Information Swale No Drainage Area ac Impervious Area ac Grassed Area (ac) C Q (cfs) V allow (f s V aclual (fps) Flow De th ft WQS-A 181 076 1 05 049 5 55 5 00 1 42 088 WQS-B 200 090 1 10 051 644 500 234 074 SW- 1 070 029 041 048 236 500 275 041 SW-2 096 019 077 031 207 500 325 036 SW-3 048 0 14 034 038 1 29 500 303 029 SW-4 098 027 071 037 254 500 255 045 1 uim tiWt J-105 V4i ; 99 P isL 2 oI � �� z III. CURB OUTLET SYSTEM MAINTENANCE REQUIREMENTS 4 -3 1 Mowing will be accomplished as needed according to the season Grass height will not exceed six inches at any time 2 Swales will be inspected monthly or after every runoff producing rainfall event for sediment build-up, erosion, and trash accumulation 3 Accumulated sediment and trash will be removed as necessary Swales will be reseeded or sodded following sediment removal 4 Eroded areas of the swales will be repaired and reseeded Swales will be revegetated as needed and in a timely manner based on the monthly inspections 5 Catch basins, curb cuts, velocity reduction devices, and piping will be inspected monthly or after every significant runoff producing rainfall event Trash and debris will be cleared away from grates, curb cuts, velocity reduction devices, and piping 6 Swales will not be altered, piped, or filled in without approval from NCDENR Division of Water Quality I acknowledge and agree by my signature below that I am responsible for the performance of the six maintenance procedures listed above I agree to notify DWQ of any problems with the system or prior to changes to the system or responsible party Print Name and Title Michael Merritt, Member/Manager Address 141A Old Fayetteville Road, Leland, NC 28451 Phone 910) 616-1000 Date February 19, 2007 Signature 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 [, a Notary Public for the State of , County of do hereby certify that personally appeared before me this _ day of , and acknowledge the due execution of the foregoing infiltration basin maintenance requirements Witness my hand and official sea] SLAL My commission expires Owl ibrm SWU-105 Vcr 3 99 Pa L 3 of 3 05-07-'07 11:57 FEM-9103831045 9123831045 T-182 P002f0137 F-SM OENrERAL POWER OF ATTORNEY BE IT KNOWN, thatGroup, ede and appoiniod, and by these presents does make and appoint Andrea S. Larklnatrue and lawful attorney for him and in his name, place and stead, giving and granbrig to said attorney, general and limited power and authority to do and peftm all and every act and thing whatsoavar requislis newwary to be clone In and about the pramisee as sully, to all intents and purpows, as could be done if personally present, with full power of swboUtution and revocation, hereby rablVing and confirming all that said attorney shall lawful do or Cause to be done by vlrlus hareof. IN WLTNESS WHEREOF, I have h1oreunto set my hand and seal this ,day a 2Q State of North Carolina as County of $rurwMck The foregoing instrument was acknowledged by Ire this - ,'day of jkay. 2Q9, By, Miftell. Merritt who Isfers pamnally known by me or who ha&fhava produced o mrml kri ftWoe as Identification and who did not take an oath. /���/y otaru• �° T� State North (WIna A My Commission Expires, March 27, 2012 , 4/ 8 t G q 6V ER,1�'�\\����� dr7o z!� 3 �I7_ YO~7` - `C� 1`eA/. �L Permit No {to be provided by DWQj State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DW _ Stormwater Management Plant Review A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details I. PROJECT INFORMATION Project Name Oak Creek at Maritime 5hore5 Contact Person Michael Merritt Phone Number (9 1 0) G I G- 1 000 For project with multiple basins, specify which basin this worksheet applies to Pond # I elevations Basin Bottom Elevation Permanent Pool Elevation -Temporary Pool Elevation areas Permanent Pool Surface Area Drainage Area Impervious Area volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DA Diameter of Orifice Design Rainfall Design TSS Removal 2 -3,1, 5— 4c A r/ 0-1�°7 28 (F,91 ft (floor of the basin) 37 / ft (elevation of the orifice) 40 ft (elevation of the discharge structure overflow) 8510 7G sq ft (water surface area at the orifice elevation) G 52 ac (on -site and off -site drainage to the basin) 2 48 ac (on -site and off -site drainage to the basin) 1 8104 cu ft (combined volume of main basin and forebay) 31933 cu ft (volume detained above the permanent pool) 395G 7 cu ft (approximately 20% of total volume) 10tQ(0'1 PT12 2 1 2% in iq' I in 90 % (surface area to drainage area ratio from DFVQ table) (2 to 5 day temporary pool draw -down required) (minimum 8.5% required) Form SWU-102 Rey 3 99 Page 1 of 4 (/7-��7 - �e o Footnotes a-70 -z 3 Sc�.rcew ' When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth Linear interpolation should be employed to determine the correct value for non- standard table entries 2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N C Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section 15 A NCAC 2H 1008 Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below If a requirement has not been met, attach ,justification. its a The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet) b The forebay volume is approximately equal to 20% of the basin volume c The temporary pool controls runoff from the design storm event d The temporary pool draws down in 2 to 5 days e If required, a 30-foot vegetative filter is provided at the outlet ( include non -erosive flow calculations) f The basin length to width ratio is greater than 3 1 g The basin side slopes above the permanent pool are no steeper than 3 1 h A submerged and vegetated perimeter shelf with a slope of 6 1 or less (show detail) ALVO i W_ J A" k mWVN\ I ku'�,(>MM m Vegetative cover above the permanent pool elevation is specified A trash rack or similar device is provided for both the overflow and orifice A recorded drainage easement is provided for each basin including access to nearest right - of —way If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin A mechanism is specified which wtll drain the basin for maintenance or an emergency III WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter tf one is provided This system (check one) 0 does oes n incorporate a vegetated falter at the outlet. This system (check one) 0 does does n incorporate pretreatment other than a forebay. Form SWU-102 Rev 3 99 Page 2 of 4 0 70 Maintenance activities shall be performed as Poll s After every significant runoff producing rainfall event and at least monthly a Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition b Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed 2 Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed 3 Inspect and repair the collection system (t a catch basins, piping, swales, rtprap, etc ) quarterly to maintain proper functioning 4 Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below) Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i a stockpiling near a wet detention basin or stream, etc ) The measuring device used to determine the sediment elevation shall be as such that it will give an accurate depth reading and not readily penetrate into accumulated sediments When the permanent pool depth reads 4 1 2`� feet in the main pond, the sediment shall be removed When the permanent pool depth reads 6 75 feet in the forebay, the sediment shall be removed BASIN DIAGRAM Permanent Pool Elevation = 37 O I/ Sediment Removal Ele t:or = 30 25 75% Sediment Removal Elevation = 32 88 75% Bottom Elevation = 28 0 25%Bottom Elevation = 3! 5 25% \� FOREBAY MAIN POND 5 Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface These plants shall be encouraged to grow along the vegetated shelf and forebay berm b If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical 7 All components of the wet detention basin system shall be maintained in good working order Form SWU-IO2 Re% 3 99 Page 3 of 4 n7a Z4L.,3 61z sk7- ree V i -ev 4 Sl o d I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party Print name Michael Merritt Title Member/Manager Address 14 1 -A Fayetteville Rd , Leland, NC 2845 1 Phone (9 1 0) G I G-1 000 Signat Date 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 I, ,a Notary Public for the State of County of ,do hereby certify that personally appeared before me this day of ,and acknowledge the due execution of the foregoing wet detention basin maintenance requirements Witness my hand and official seal, SEAL My commission expires Form SWU-102 Re-, 3 99 Page 4 of 4 05-07-17 11,57 FROM-9123831045 9123831045 T-182 P802/007 F-994 GEN5RAL POWER OF ATTORNEY BE fr KNOWN, that ade and appolntad, and by these praaerlts does make and appoint Andrea S. l_ r� ns tnie and NmOul attorney for him end In his narma, place and stead, giving end granting to said attorney, general and lirnrted power and authority to do and perRm all and every act and thing what>3osvar requisite neftuary to be done In and about the prmrnlses as fatly, to all Interns and purposes, as could be dame if pamnaily prevent, wRh full power of subsRudon and revocation, hereby rati(Ang and confirming all that gold attorney shell lawful do or cause to be done by virtue hareaf, IN W�N1=88 WHEREOF, I have herounto set my hand and sea! this Wday of� 2d State of North Carolina so County of Brunswick The foregoing instrument was aatmowiedged by me this day of a 209 Sy, Michael L McMfl who Ware personally known by me or who hasihava produced Romnal knaunedae as Identification and who did not take an oath `SIN$\,,N�t111i1K111�111/y/y��� NX 1 , ots OTAR%' s A State o North Q b My Commfesien Expires: March 27, 2012 Se c ': o ¢"'OVER G" ,V"'�` ""0111111110111, STATE OF NORTH CAROLINA BRUNSWICK COUNTY On this 22nd day of June, 2007, personally appeared before me, the said named Andrea Larkins to me known and known to me to be the person described in and who executed the foregoing instrument and she acknowledged that she executed the same and being duly sworn by me, made oath that the statements in the foregoing instrument are true My Commission Expires March 27, 2012 00, OFFICIAL SEAL jjdgubllo Nord+ Cauopnat NEW HANOVER COUNTY H Scott Kennedy, H SCO17 KENNEDY. JR Notary Public ,.,.�.,r r.,r,.�.,. ,,. �..• .. Permit NodOg 07024.; (to be pi ovwled by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use cis cm original DWQ Stormwater Management Plan Review A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details I. PROJECT INFORMATION Project Name Oak Creek at Maritime Shores Phase 2 Contact Person Michael Merritt Phone Number (9 10) G I G-1 000 For project with multiple basins, specify which basin this worksheet applies to Pond #2 elevations Basin Bottom Elevation 41 ft (floor of the basin) Permanent Pool Elevation 45 ft (elevation of the orifice) Temporary Pool Elevation 4535 f (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 4314 sq ft (water surface area at the orifice elevation) Drainage Area 133 ac (on -site and off -site drainage to the basin) Impervious Area 039 ac (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 5407 cu ft (combined volume of main basin and forebav) Temporary Pool Volume 2,172 cu ft (volume detained above the permanent pool) Forebay Volume I OOG cu ft (approximately 20% of total volume) Other parainetei s SA/DA ' 3 50% (viii face at ea to di ainage ai ea ratio fi om DWQ table) Diameter of Orifice 075 m (2 to 5 day temporary pool ch aw-down i equit ed) Design Rainfall I in Design TSS Removal 2 90 % (minimum 85% required) Foi ni SIVU-102 Rev 3 99 P,ige 1 of -t D 076 243 Footnotes b /�-Iv'7 - e ec � `r 0--e f ' C10 When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth Linear interpolation should be employed to determine the correct value for non- standard table entries 2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N C Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section 15 A NCAC 2H 1008 Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below If a requirement has not been met, attach justification. its a The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet) b The forebay volume is approximately equal to 20% of the basin volume c The temporary pool controls runoff from the destgn storm event d The temporary pool draws down in 2 to 5 days e If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) f The basin length to width ratio is greater than 3 1 g The basin side slopes above the permanent pool are no steeper than 3 1 h A submerged and vegetated perimeter shelf with a slope of 6 1 or less (show detail) i Vegetative cover above the permanent pool elevation is specified J A trash rack or similar device is provided for both the overflow and orifice k A recorded drainage easement is provided for each basin including access to nearest right - of —way �'Ki'111ti �.1 If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin in A mechanism is specified which will drain the basin for maintenance or an emergency ftukyw III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT 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) 0 does Edoess incorporate a vegetated filter at the outlet. This system (check one) 0 does incorporate pretreatment other than a forebay. Form. SWU-102 Rev 3 99 Page 2 of 4 �o7 &dress.-3 SOc 0762.4-3 q/14 07 � -e yr J r/ 3 After every significant runof f producing rainfall event and at least monthly a Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition b Check and clear the onIice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed 2 Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed 3 Inspect and repair the collection system (i e catch basins, piping, swales, riprap, etc ) quarterly to maintain proper functioning 4 Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below) Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i c stockpiling near a wet detention basin or stream, etc ) The measuring device used to determine the sediment elevation shall be as such that it will give an accurate depth reading and not readily penetrate into accumulated sediments When the permanent pool depth reads 3 00 feet in the main pond, the sediment shall be removed When the permanent pool depth reads 3 00 _ feet in the forebay, the sediment shall be removed BASIN DIAGRAM ill irr the blanks) Permanent Pool Elevation = 45 0 5ediment Pemoval Ele tion = 42 00 79% 5ediment Removal Elevation-_42 00 75% Bottorn Elevation = 41 0 \^ 95%{ / 1 Bottom Elevation = 4 1 0 FOREBAY MAIN POND 5 Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface These plants shall be encouraged to grow along the vegetated shelf and forebay berm 6 If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical 7 All coimponents of the wet detention basin System shall he maintained in good working order Foi rn ti1VU-102 RED% 3 99 Vage i (it 4 d7�24 A-i2--I V. /' � j W 1? /� - ',"- I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party Print name Michael Merritt Title Member/Manag4 Address 14 1 A old >_ Phone Signat Date r le Road, Leland, NC 2545 1 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 I, ,a Notary Public for the State of County of ,do hereby certify that personally appeared before me this day of ,and acknowledge the due execution of the foregoing wet detention basin maintenance requirements Witness my hand and official seal, SEAL My commission expires Form. SWU-102 Rev 3.99 Page 4 of 4 STATE OF NORTH CAROLINA BRUNSWICK COUNTY On this 22nd day of June, 2007, personally appeared before me, the said named Andrea Larkins to me known and known to me to be the person described in and who executed the foregoing instrument and she acknowledged that she executed the same and being duly sworn by me, made oath that the statements in the foregoing instrument are true My Commission Expires March 27, 2012 g&OFFICIAL SEAL Notary Public North Caroline �� HANOVER COUNTY H S OTT KENNEDY, JR Scott Keened , Jr Notary Public ` ' 06-07-17 11, 57 FFM-9103831045 9123832045 T-182 P121321007 P-994 ©ENSRAL POWER OF ATTORNEY BE IT KNOvwV, that ade and appok0d, and by these presents does make and appoint Andrea & L r9 kw true and Iawki Attorney for him and in his name, place end steed, giving and $r"nq to said attorney, general and limited power and authority to do and perrorm all and every eat and thing whMsodVer requisite neasessfy to be done In and about the premise& as fully, to all Intents and purposes, as could be lone if personally present, with fluff power of substitution and revocation, hereby ratiMag and confirming ail that said attorney shall lawful do or cuts* I* be done by virtue herW IN WITNESS WHEREOF, I have hereunto set my hand and seal this day 20 State of North Carolina es. County of Brunswick The foregoing Instrument was ackmawledgad by me this day of Jimy 209 By. M hftl L. MIMS who IsMrs personally known by nee or who hasihave produced wffyonal know0ce as Identification and who did I My Commfssion Expires, March 27,202