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HomeMy WebLinkAboutSW8990732_HISTORICAL FILE_19991110STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SWL of O'l32 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE (q g cl i I 10 YYYYMMDD Department of Environment and Natural Resources Wilmington Regional Office James B Hunt, Jr., Governor Bill Holman, Secretary Division of Water Quality Mr Terry Turner, President Saturn Development 3901 Oleander Drive Wilmington, NC 28403 Dear Mr Turner A74ZIU1 NCDENR NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND N/ URAL RESOURCES November 10, 1999 Subject Permit No SW8990732 Brewster Place Phase 2 High Density Subdivision Stormwater Project New Hanover County The Wilmington Regional Office received a complete Stormwater Management Permit Application for Brewster Place Phase 2 on September 21 1999 Staff review of the plans and specifications has determined that the project, as proposed, will complywiththeStormwater Regulations setforthmTrtle 15ANCAC2H 1000 We are forwarding Penn it No SW8990732, dated November 10, 1999, for the construction of the project, Brewster Place Phase 2 This permit shall be effective from the date of issuance until November 10, 2009, and shall be subject to the conditions and limitations as specified therein Please pay special attention to the Operation and Maintenance requirements in this permit Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems if any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings 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 Linda Lewis, or me at (910) 395-3900 Sincerely, Crlti _A ` 1 Rick Shiver Water Quality Regional Supervisor RSS/ arl S \WQS\STORMWAT\PERMIT\990732 NOV cc David Hollis P E Tony Roberts, New Hanover County Inspections Beth Easley, New Hanover County Engineering - Linda Lewis Wilmington Regional Office Central Files 127 Cardinal Dr Ext, Wilmington, North Carolina 28405 Telephone 910-395-3900 FAX 910-350-2004 An Equal Opportunity Affirmative Action Emplover 50% recycled/10% post -consumer paper State stormwater Management Systems PermtNo SW8990732 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Saturn Development Brewster Place Phase 2 New Hanover County FOR THE construction, operation and maintenance of a wet detention pond in compliance with the provisions of 15A NCAC 2H 1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit This permit shall be effective from the date of issuance until November 10, 2009 and shall be subject to the following specified conditions and limitations I DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data 2 This stormwater system has been approved for the management of stormwater runoff as described on page 3 of this permit, the Project Data Sheet The subdivision is permitted for 107 lots, each allowed 4,000 ft2 square feet of built -upon area Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit 4 All lots are proposed to be graded such that the runoff flows into the street or onsite ditches which drain into the pond State Storm"ater Management Systems Permit No SW8 990732 Project Name Permit Number Location Applicant Mailing Address Application Date Name of Receiving Stream / Index # Classification of Water Body If Class SA, chloride sampling result Design Storm Pond Depth, feet Permanent Pool Elevation, FMSL Total Impervious Surfaces, ft2 107 lots at 4,000 ft2 each Roads/Parking, ft2 Other, ft2 Offsite Area entering Pond, ft2 Required Surface Area, ft2 Provided Surface Area, ft2 ft Required Storage Volume, ' Provided Storage Volume, fP Temporary Storage Elevation, FMSL Controlling Orifice 0 DIVISION OF WATER QUALITY PROJECT DATA SHEET Brewster Place Phase 2 SW8 990732 New Hanover County Mr Terry Turner, President Saturn Development 3901 Oleander DriveWilmington, NC 28403 September 21, 1999 Mott Creek / (CFR 18-82) "C Sw" s n/a 1" 75 65 604,138 428,000 176,138 n/a None, per Engineer 16,993 59,739 51,287 64,780 75 1" � pipe 3 State Stormwater Management Systems PermuNo SW899073) II SCHEDULE OF COMPLIANCE No homeowner/lot owner/developer shall fill in, alter, or pipe any drainage feature (such as swales) shown on the approved plans as part of the stormwater management system without submitting a revision to the permit and receiving approval from the Division 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 The following items will require a modification to the permit a Any revision to the approved plans, regardless of size b Project name change c Transfer of ownership d Redesign or addition to the approved amount of built -upon area e Further subdivision, acquisition, or sale of 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, altering, or piping of any vegetative conveyance shown on the approved plan 4 The Director may determine that other revisions to the project should require a modification to the permit 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 The stormwater management system shall be constructed in it's entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface except roads During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately The permittee grants permission to DENR Staff to enter the property for the purposes of inspecting the project for compliance with the conditions of this permit Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation Any deviations from the approved plans and specifications must be noted on the Certification 10 Decorative spray fountams will not be allowed in the stormwater treatment system 11 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 pnor to occupancy of the facility 12 Prior to transfer of ownership, the pond must be inspected by DWQ personnel, and determined to be in compliance with all permit conditions Records of maintenance activities will be required State Stormwater Management Systems Permit No SW8990732 13 The permttee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to Semiannual scheduled inspections (every 6 months) Sediment removal c Mowing and revegetation of side slopes d Immediate repair of eroded areas e Maintenance of side slopes in accordance with approved plans and specifications f Debris removal and unclogging of outlet structure, orifice device and catch basins and piping g Access to the outlet structure must be available at all times 14 Records of maintenance activities must be kept and made available upon request to authorized personnel of D WQ The records will indicate the date, activity, name of person performing the work and what actions were taken 15 Prior to the sale of any lot, deed restrictions must be recorded which limit the built -upon area per lot to the amount as shown on the Project Data Sheet, per Section I, Part 2 The recorded statements must follow the form "The maximum built -upon area per lot is 4,000 ft2 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, and coquina, but does not include raised, open wood decking, or the water surface of swimming pools " b "The covenants pertaining to stormwater regulations may not be changed or deleted without concurrence of the State " "Alteration of the drainage as shown on the approved plan may not take place without the concurrence of the State " d "Lots within CAMA's Area of Environmental Concern may be subject to a reduction in their allowable built -upon area due to CAMA regulations " "All runoff on the lot must dram into the permitted system This may be accomplished through providing roof drain gutters which dram to the street, grading the lot to dram toward the street, or grading perimeter swales and directing them into the pond or street Lots that naturally dram into the system are not required to provide these measures " 16 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 bear the signature of the Permittee, the deed book number and page, and stamp/signature of the Register of Deeds 17 This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data 18 A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten` years from the date of the completion of construction State Stormwater Management Systems Permit No S W 8 990732 I11. GENERAL CONDITIONS This permit is not transferable In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a "Name/Ownership Change Form" must be submitted to the Division of Water Quality accompanied by appropriate documentation from the parties involved, such as a copy of the deed of trust Other supporting materials, such as a signed Operation and Maintenance plan in the case of engineered systems, will also be required The project must be in good standing with DWQ The approval of this request will be considered on its ments and may or may not be approved 2 Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215 6A to 143-215 6C The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems 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 Permittee grants permission to staff of the DWQ to access the property for the purposes of inspecting the stormwater facilities during normal business hours Pen -nit issued this the 1 Oth day of November, 1999 NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION 1) F-. c 4 4 — 4 J A A n 1� Kerr T Stevens, Director C �l Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW8 990732 0 State Stormwater Management Systems Permit No SWS 990732 Brewster Place Phase 2 Stormwater Permit No SW8 990732 New Hanover County Designer's Certification Page 1 of 2 1, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the 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 wrtlun 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 SEAL Signature Registration Number Date State Stormwater Managgement Systems Permit No SW8990732 Certification Requirements Page 2 of 2 l 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 drams to the system 4 The outlet/bypass structure elevations are per the approved plan 5 The outlet structure is located per the approved plans 6 Trash rack is provided on the outlet/bypass structure All slopes are grassed with permanent vegetation 8 Vegetated slopes are no steeper than 3 1 9 The inlets are located per the approved plans and do not cause short-circuiting of the system 10 The permitted amounts of surface area and/or volume have been provided 1 I Required drawdown devices are correctly sized per the approved plans 12 All required design depths are provided 13 All required parts of the system are provided, such as a vegetated shelf, a forebay, and the vegetated filter 14 The overall dimensions of the system, as shown on the approved plans, are provided cc NCDENR-DWQ Regional Office Tony Roberts, New Hanover County Building Inspector ram.o,- OFFICE USE Date Received Fee Paid Pervut Number State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form inay be photocopied for use as an of iginal I GENERAL INFORMATION 1 Applicants name (specify the name of the corporation, individual, etc who owns the project) .Sad-urh pe✓elo,�,-�,eh-F 2 Print Owner/Signing Official's name and title (person legally responsible for facility and compliance) 7 rr>. TurnPr I 1P✓e-idle, �t- 3 Mailing Address for person listed in item 2 above 3 90/ 01ea,n(Pc- 1:)f lve Cityt0de ina4rin State AlG Zip z94-03 Telephone Number ( Dlo ) --3 9S— 4DoE 4 Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc ) C3rewsler P(c PAare T-.0 5 Location of Project (street address) City W dr",10/rx-� County NP1✓ lfano✓er 6 Directions to project (from nearest major intersection) ^O//II GOUT O TWV I Z�aCC ''T// AA II�� v 1 iI / / Carols G AN iI S /'�` 'YZ/-Fakp opx-)" roof Oh '1T) SPr ✓iCC rw0 e I7eKT 12 A ,n'!p Qpe caster piac� 7 Latitude 34`8 l3 44' Longitude 77 S4-'14,97" of project 8 Contact person who can answer questions about the project Name ltiowarReshJ%c !%( Telephone Number ( Y10 ) 343-800Z 14ano✓el- Des+9A Serv-cev, Pk II PERMIT INFORMATION 1 Specify whether project is (check one) K New Renewal Modification Form SWU-101 Version 3 99 Page 1 of 4 2 If this application is being subrrutted as the result of a renewal or modification to an existing permit, list the existing permit number A/,I - and its issue date (if known) 3 Specify the type of project (check one) ?t Low Density High Density Redevelop _General Pernut _Other 4 Additional Project Requirements (check applicable blanks) _LAMA Major Sedimentation/Erosion Control _404/401 Permit NPDES Stormwater Information on required state penruts can be obtained by contacting the Customer Service Center at 1-877-623-6748 III PROJECT INFORMATION 1 In the space provided below, summarize how stormwater will be treated Also attach a detailed narrative (one to two pages) describing /(storm/water management for the project . `4,grm,�la, -e_r cuill be_ rain c( -Fo and "/--rea1e C4P"fe.1-�)aA re, e.n -han r2.,c( c%� ne J >^ar 907 %SS and 40 wi n a e '%Ae_ Z a., of lO )1P4,r .s-for e✓e«its 2 Stormwater runoff from this project drains to the one %Par River basing/n 3 Total Project Area Z.3 3 acres 4 Project Built Upon Area 4 Z, 5 How many drainage areas does the project have? 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 Bas Info, oimatuoiJM­ =c �&% Dimae Ar&WA a� wag, e � 4=DramageArea 2 . r _ Receiving Stream Name (Y o+l Creek Receiving Stream Class G SW Drainage Area 3 Z, 9 at r e Existing Impervious* Area -- Proposed Impervious Area /3, 87 acres tin ervious* Area (total) Z tjo -14 ` Im ery ousr�Surfac Aiea DiarnageA°ipt, q , Nam+ ` _a,.z, -m z»roeYr' 1 ¢ .. 4`i. W+� ,Dramage,,'* real' o A.,,�_ ..., .�am+��.^'�+ ^• .�-< a On -site Buildings 9, 8 3 acre On -site Streets ¢ O¢ cores On -site Parking _ On -site Sidewalks Other on -site �— Off-site Total 13 9-7 core Total Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc Form SWU-101 Version 3 99 Page 2 of 4 7 How was the off -site impervious area listed above derived?, IV DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot If lot sizes vary significantly, a table listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment 1 The following number covenants are intended to ensuic ongoing compliance with state stormwater management permit 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 4 000 square feet of any lot shall be covered by stKictures or impervious materials Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood decking or the water surface of swimming pools 3 Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings 4 Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction 5 All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claurung 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 subrmtted for each BMP specified for this project Contact the Stormwater and General Pernuts Unit at (919) 733-5083 for the status and availability of these forms Form SWU-102 Form SWU-103 Form SWU-104 Form SWU-105 Form SWU-106 Form SWU-107 Form SWU-108 Form SWU-109 Wet Detention Basin Supplement ✓ Infiltration Basin Supplement Low Density Supplement Curb Outlet System Supplement Off -Site System Supplement Underground Infiltration Trench Supplement Neuse River Basin Supplement Innovative Best Management Practice Supplement _l Form SWU-101 Version 3 99 Page 3 of 4 VI SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ) A complete package includes all of the items listed below The complete application package should be submitted to the appropriate DWQ Regional Office Please indicate that you have provided the following required information by initialing in the space provided next to each item Initials • Original and one copy of the Stormwater Management Permit Application Form u Q • One copy of the applicable Supplement Form(s) for each BMP I , • Permit application processing fee of $420 (payable to NCDENR) W • Detailed narrative description of stormwater treatment/management • Two copies of plans and specifications, including f p - Development/Project name - Engineer and firm -Legend - North arrow 1 - 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 authority to another individual or firm so that they may provide uiformation on your behalf, please complete this section Designated agent (individual or firm) 14anoVer De_5ign 5e_r✓ic&51 PA Mailing Address 319 60It1nui J�fr-eef City b-A /rn) n g40A State NC__ zip Z L3 401 Phone ( -910 ) 343— 8000 VIII APPLICANT'S CERTIFICATION Fax ( - l 0 ) 343 — .99 4/ f I, (print or type name of person listed in General Information, item 2)" f e (lry L) certify that the information included on tlus 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 1000-71 Signature L"VI v✓ Date' Z Form SWU-101 Version 3 99 Page 4 of 4 Permit No (to be provided 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 Thu form may be photocopied for use as an 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 PJ z6 e2 Ptiase, Two Contact Person Tern, l urner Phone Number (9/0 1 3JS--J Y' 6 For projects with multiple basins, specify which basin this worksheet applies to elevations Basin Bottom Elevation "/, O ft lPermanent Pool Elevation C, S ft 'Temporary Pool Elevation -7S ft areas Permanent Pool Surface Area, 739 sq ft Drainage Area 32, 9 :� ac Impervious Area volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DA i Diameter of Orifice Design Rainfall Design TSS Removal 2 FormSWU-102 Rev399 )3,07 ac Z33 -5Z7 cu ;9r 7zo cu S&2oS-_ cu Ile /. � Z 4,0 in Uin 90 % (floor of the basin) (elevation of the orifice) (elevation of the discharge structure overflow) (water surface area at the orifice elevation) (on -site and off -site drainage to the basin) (on -site and off -site drainage to the basin) ft (combined volume of main basin and forebay) ft (volume detained above the permanent pool) ft (approximately 20% of total volume) (surface area to drainage area ratio from DWQ table) (2 to 5 day temporary pool draw -down required) (nunimum 85% required) Page 1 of 4 Footnotes )t When using the Division SAIDA tables, the correct SAIDA 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%c 1 SS 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 irr the Stormwater Management Permit Application Form, the agent may initial below If a requirement has not been met, attach justification. Applicants Initials I-�,V. a The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet) 14'(7 b The forebay volume is approximately equal to 20% of the basin volume P, r;, c The temporary pool controls runoff from the design storm event a,p_. d The temporary pool draws down in 2 to 5 days i kI A e If required, a 30-foot vegetative filter Is provided at the outlet (include non -erosive flow calculations) {�A? f The basin length to width ratio is greater than 3 1 9 X g The basin side slopes above the permanent pool are no steeper than 3 1 1h R h A submerged and vegetated perimeter shelf with a slope of 6 1 or less (show detail) N , i2, I Vegetative cover above the permanent pool elevation is specified kl I A trash rack or similar device is provided for both the overflow and onfice k A recorded drainage easement is provided for each basin including access to nearest right- of-way �. re 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 Q, in A mechanism is specified which will dram the basin for maintenance or an emergency �tea pL4-Vi-A-P 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 _J This system (check one) 0 does 0/does not incorporate a vegetated filter at the outlet This system (check one) 0 does 9�does not incorporate pretreatment other than a forebay Form SWU-102 Rev 3 99 Page 2 of 4 Maintenance activities shall be performed as follows 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 onfice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed 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 Inspect and repair the collection system (i e catch basins, piping, swales, nprap, etc ) quarterly to maintain proper functioning 4 Remove accumulated sediment from the wet detention basin system serm-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 deterrrune the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments ly- When the permanent pool depth reads 5,�LZ s feet in the main pond, the sediment shall be removed When the permanent pool depth reads 3-375 feet in the forebay, the sediment shall be removed BASIN DIAGRAM (fill to the blanks) Permanent Pool Elevation S Uit SedimenAReoval 3 125 75 o--------- -- Sediment Removal Elevation 0. 875 75% -------------- ----- n------------------------------- /,y 25%aBot� o Bottom Elevation FOREBAY MAIN POND 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 Ithrough the emergency drain shall be minimized to the maximum extent practical Form SWU-102 Rev 3 99 Pave 3 of 4 7 r All components of the wet detention basin system shall be maintained in good working order i 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 Tel'r-,e %.rner r Title Prestoieh F Safurn Oeveelent Address 39ot 0le- at, de- r Dr.✓e WiNG -8403 Phone—(910 32'S- ¢Qoc Signature Curti IA/ Date cA 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 NC�1� jt' ItYlL1 County of r , do hereby certify that e.rrIA T t 10 e—r— personally appeared before me this a3A day of JU: °I and acknowledge the due execution of the forgoing wet detention basin maintenance requirements Witness my hand and official seal, CA 4f Q �GTAq j F� z *** 0 AVBI�G 2 IER CO J. SEAL My commission expires 1 1 j Form SWU-102 Rev 3 99 Page 4 of 4 Hanover Design Services, P.A. Land Surveyors, Engineers, Land Planners September 20, 1999 SEP $ 1 1,999 Ms Linda Lewis Environmental Engineer N C Department of Environment And Natural Resources Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Re Stormwater Management Permit for Brewster Place Phase Two New Hanover County HDS Project No 3888 Stormwater Project No. SW8 990732 Dear Ms Lewis Enclosed please find the following items - original and one (1) copy of the revised Stormwater Management Permit Application and Wet Detention Basin Supplement for the referenced project - one (1) copy of the revised `page 1' of the Stormwater Management Calculations - two (2) copies of sheets 1 through 3 entitled "Erosion and Sediment Control and Water Quality Plan" Responding to comments 1 and 10 in your September 13, 1999 transmittal, the total drainage area on the site is 32 93 acres Lots 100 through 112 have already been permitted under a previous stormwater project (SW8 960704) and should not have been included on this application The application has been revised accordingly The forebay volume has been adjusted to 58,705 cubic feet per comment 2 Clean -out depths now accurately reflect the `75% of design depth' values (comment 3) Addressing comment 5, the finalpllat will show the pond area recorded as a drainage easement The vicinity map has been modified to show Brewster and Trsbury Lanes (comment 7) Also, a note has been included on sheet 1 stating that all stormwater will flow to the streets or drainage swales onsite (comment 8) 319 Walnut Street Wilmington, NC 28401 (910) 343-8002 Addressing comment 9, the outlet end of the pond has been widened and made deeper and the middle section has been narrowed to keep the volumes and storage consistent with the calculations Although the over -design of the pond may not nutigate the concerns with the problem mentioned, the over -design combined with the +/- 500 LF of grassed channel draining to the forebay (which also serves as storage) certainly compensates for this shortcoming from a water quality perspective Addressing comment 4, the wetlands issue is still undergoing arbitration We hope to resolve the issue shortly and will notify you when a resolution has been reached We request NCDENR certification of compliance of this project with stormwater regulations Thank you for your consideration of this request Please call if you require any additional information Very truly yours, Howard Resnik, EI Encl As noted above cc Saturn Development State of North Carolina Department of Environment and Natural Resources Wilmington Regional Office James B Hunt, Jr, Governor Bill Holman, Secretary Division of Water Quality September 13, 1999 Mr Terry Turner, President Saturn Development 3901 Oleander Drive Wilmington, NC 28403 Ame �.q WA RCDENK NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES Subject ACKNOWLEDGMENT OF RECEIPT AND REQUEST FOR ADDITIONAL INFORMATION Stormwater Project No SW8 990732 Brewster Place Phase II New Hanover County Dear Mr Turner The Wilmington Regional Office received a Stormwater Management Permit Application for Brewster Place Phase II on July 26, 1999 A preliminary review of that information has determined that the application is not complete The following information is needed to continue the stormwater review The application indicates that the percent impervious of this project is 53% If you divide 13 87 by 39 6 (project acreage), you get 35% The application also indicates that the drainage area is 53% impervious If you divide 13 87 by 32 93 (drainage area acreage), you get 42% Please correct and revise The 13 87 acres is questionable since you have not included all 120 lots in the summary table (See comment #10 below) You are always free to overdesign the pond, however, please be accurate in what you report on the application 2 The forebay volume provided is deficient The minimum required forebay volume is determined by multiplying the "Permanent Pool Volume" by 20% For this pond, a maximum of 58,705 cubic feet must be provided in the forebay As discussed in the workshop, please do not provide more than 20% in the forebay The cleanout benchmark depth needs to be revised The supplement currently indicates that the pond will be allowed to be reduced to a depth of 5 5' prior to cleanout The standard is 75% of the design depth, or 5 625' Please revise Delineate all wetlands on site, or note on the plans that none exist Locate the pond in a recorded access/drainage easement Please reference the project number above on all correspondence Please add Tisbury and/or Brewster Lane and the name of the road off of the service road, to the vicinity map 127 Cardin d Dr Ext, Wilmington, North Carolina 28405 Telephone 910-395-3900 FAX 910-350-2004 An Equal Opportunity Affirmative Action Employer 50% recicled/10% post -consumer paper Mr Turner September 13, 1999 Stormwater Project No SW8 990732 Since this subdivsion exceeds low density, all runoff from all of the built -upon area on all of the lots must be directed into the pond Usually, perimeter swales or lot grading requirements are used to ensure that all the runoff is directed to the pond Please indicate the method of collecting all the runoff on the plans Show Swale grading, or add a note indicating that all lots must be graded such that they drain to the street If you do not wish to collect all the lot runoff, please reduce the BUA per lot so that 30% density is achieved A low density supplement will be required if you choose this option This pond design is backwards from the model that the SA/DA ratio tables were derived Ideally, the pond should be narrow at the inlet and gradually widen and deepen to the outlet In the proposed pond, the area around the outlet structure is not as deep as the rest of the pond, and may result in deficient pond functioning The over -design does not mitigate these concerns 10 You only include 107 of the 120 lots in the drainage area to the pond The total BUA for 120 lots @4,000 square feet is 480,000, or 1102 acres The application and calculations account for only 9 83 acres Please revise, per comment #8 above Please note that this request for additional information is in response to a preliminary review The requested information should be received by this Office prior to October 13, 1999, or the application will be returned as incomplete The return of a project will necessitate resubmittal of all required items, including the application fee The Division is allowed 90 days from the receipt of a completed application to issue the permit The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215 1 and is subject to enforcement action pursuant to NCGS 143-215 6A If you have any questions concerning this matter please feel free to call me at (910) 395-3900 Sincerely, Linda Lewis Environmental Engineer RSS/arl S \WQS\STORMWAT\ADDINFO\990732 SEP 1 cc Linda Lewis David Hollis, P E July 27, 1999 Ms Linda Lewis Environmental Engineer N C Department of Environment And Natural Resources Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Re Stormwater Management Permit for Brewster Place Phase Two New Hanover County HDS Project No 3888 Dear Ms Lewis Enclosed please find the following items N� RECEIVED JUL 4 0 1999 BY: JUL 0v1 �Z original and one (1) copy of the completed Stormwater Management Permit Application and Wet Detention Basin Supplement for the referenced project $420 00 application fee one ( l) copy of the Stormwater Management Calculations one (1) copy of the Erosion Control Narrative and Specifications one (1) copy of the Erosion Control Calculations two (2) copies of sheets 1 through 3 entitled "Erosion and Sediment Control and Water Quality Plan" Stormwater on this project will be controlled using one (1) detention pond We request NCDENR certification of compliance of this project with stormwater regulations Thank you for your consideration of this request Please call if you require any additional information Very truly yours, Howard Resnik, EI Hanover Design Services, PA Encl As noted above cc Saturn Development EROSION AND SEDIMENT CONTROL PLAN BREWSTER PLACE PHASE TWO for SATURN DEVELOPMENT July, 1999 NARRATIVE NOTE To be reviewed in conjunction with "Erosion and Sediment Control Plan for Brewster Place Phase Two", Hanover Design Services, P C , Drawing No 3888ecpHSR PROJECT DESCRIPTION - The purpose of this project is construction of a single-family residential subdivision The Erosion and Sediment Control Plan is to identify measures to be implemented to control erosion during construction of the private roads, utilities, and land grading associated with this development The site is located at the extension of existing Brewster and Tisbury Lanes in the existing Brewster Place Subdivision in New Hanover County The project is 39 63 acres in size, 33 of which are proposed to be disturbed The site is wooded with fairly flat topography with the exception of the back portion of the site which has been previously used as a borrow pit It is bordered on the north and west by an existing residential development, on the south by a construction company, and on the east by commercial property immediately adjacent to U S Hwy 421 as shown on drawing # 3888ecpHSR SOILS - The soils in the project area are primarily Lynn Haven Fine, Kureb, and Onslow Loamy Sands (Ly, Kr, and On), well drained, moderately permeable soils, with a hydrologic classification of "B/D," "A," and "B" respectively The primary means of stormwater transport in all areas around the site, all proposed site improvements, and impervious areas will be directed to the proposed pond/ basin with storm sewers and grassed swales (Soils Map attached) HANOVER t?ERi 3N! SERVICES, P A 319 WALNUT 8 i7REET WILMINGTON NC td401 CONSTRUCTION SCHEDULE - Indicated on Plan 1 Obtain approval of Plan and any necessary permits, and hold a pre -construction conference prior to commencing any work 2 Flag work limits and stake -out roadway and Sediment Basin for preliminary grading 3 Install Gravel Construction Entrance 4 Install Sediment Basin as shown on Plan prior to clearing and grubbing site 5 Construct ditches and any other sediment control Practices shown, prior to rough grading site, stockpiling topsoil as necessary 6 Establish final grades and stabilize roadway areas with stone base course 7 Final grade building sites, install public and non -municipal utilities as needed, and vegetatively stabilize areas where building construction is not imminent 8 All erosion and sediment control Practices are to be inspected weekly and after any rainfall, and repaired as necessary 9 Upon completion of building construction, the roadway areas are to be paved and all areas permanently vegetatively stabilized After site stabilization, temporary measures are to be removed and the Sediment Basin cleaned to its original design contours, if necessary, and riser structures orifices opened, so as to function as a stormwater management / water quality retention pond HANOVER DEs'gn' SERVICES, n A 319 WALNUT STREtT WILMINGTON NC 2d401