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SW6020101_CURRENT PERMIT_20020118
STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW (%`OI DOC TYPE � CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE DOC DATE &--z)r2 4Q 1_L YYYYMMDD Ar NCDENR North Carolina Department of Environment and Natural Resources Michael F. Easley, Governor January 18, 2002 Mr, Mike Gatti, Owner Carolina Court P.O. Box 602 Carthage, North Carolina 2£327 SltBJFCT: Permit No, SW6020101 Carolina Court High Density Commercial Development Stor•mwater Project Moore County Dear Mr. Gatti: William G. Ross Jr., Secretary Gregory J, Thorpe, Ph.D. Acting director Division of Water Quality The Fayetteville Regional Office received a complete Stormwater Management Permit Application for Carolina Court on January 9, 2002, Staff review of the plans and specifications has determined that the project., as proposed, will comply with the Stornlwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW6020101, dated January 18, 2002, for the construction of stormwater treatment Facilities associated with Carolina Court. This permit shall be effective from the date of issuance until January 17, 2012, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements of item 11.4 of this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result. in fixture 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 pernk 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, 6714 Mail Service Center, Raleigh, N.C. 27699-6714. Unless such demands are made, this permit shall be final and binding, Fayetteville Regional Office 225 Green Street Suite 714, Fayetteville, North Carolina 28301-50,13 Phone: 910-486-1541 ti FAX: 910-486-07071Internet: Nvww.enr,swe.nc.us"E-NR An Equal Opportunity 1 Affirmative Action Employer — 50% Recycled 110% Post Consumer Paper Mr. Gatti Date 2 January 18, 2002 If you have any questions, or need additional information concerning tfiis matter, please contact Mr. Ricky Revels at. (910) 48 _541, ext 720. Si�q�e e , Paul F. Rawls Water Quality Regional Supervisor PER: RR/rr cc: Gene Opdyke, Whispering Pines - Pianning/Z,oning/inspections Pat. S. Willett, Hobbs, Upchurch & Associates, P.A.. Fayetteville Regional Office Central Files Statc 5torinwaler Management Systems 1'em it h;o. SW6020101 STATE OF NORTH CAROLINA DEPARTMENT Of+ ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWAT R 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 Carolina Court Moore County FOR THE construction, operation and maintenance of a wet detention pond and 2 bio-retention areas in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "slot'inwatei miles'') 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 ofthis permit. The Permit shall be effective from the date of issuance until January 17, 2012 and shall be subject to the following; specific conditions and limitations: 1. DESIGN STANDANDS This pen -nit 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 4een approved for the management of stormwater runoff as described on pages 3-5 of this permit, the Project Data Sheets. One (1) Wet Detention basin designed for 90% TSS removal efficiency without effluent filter and two (2) Rio - Retention basins. The stormwater controls have been designed to handle the runoff from 1139 acres for a total of 160,003.34 square feetof impervious area. This equals a. total of 32,2774% impervious area. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 4. The tract will be limited to the amount of built -upon area indicated on pages 2-5 of this permit, and per approved plans. 2 State Stornrwater Management 5ystenis� Permit No. SW6020101 5. - The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control systems. A. permit modification gust be submitted and approved prior to the construction of additional built -upon area. 6. The built -upon area for the future development that is not included in this permit is limited to 17.7226 % as required by high density option associated with WS-1.11 regulation. A permit modification must be submitted and approved prior to the construction of additional built -upon area. 7. The drainage area for each bio-retention basin must be less than 5 acres. 8. The nriniraum width for each bio-retention area must be 15'. The minimum length for each bio-retention area must be 40', For widths greater than 20', the length must be at least twice the width. 9. The minimum required surface areafor each bio-retention basin must be 5% of tile combined rational runoff coefficient multiplied by the drainage area. 10. The minimum required volume for each bio-retention basin must be based on the 1 " storm. 11, The drawdown time for each bio-retention basin must be less than 4 days. 12, For an average tree spacing of 12', and an average shrub spacing of S', the minimum stem count For each bio-retention basin is 1,000 trees and shrubs per acre of drainage area. 13. There must be at least 2 or 3 shrubs provided for each tree. 14. A minimum of three (3) species oftrees and three (3) species of shrubs trust be provided in each bio-retention basin to ensure diversity. 15, At installation, trees must be a minimum of 2.5" dia.meter caliper. Shrubs must be at least 3 or 4 feet ill height or have an 18"-24" spread, 3 State Stormwater Management Systems Pumit No. SW6020101 DIVISION OF WATER QUALITY PROJECT DESIGN DATA SHEET Project Name: Carolina Court Permit Number: SW6020101 Location: Moore County Applicanl.: Mr, Mire Gatti, Owner Mailing Address: Post Office Box 602 Cartilage, NC 28327 Application Date: January 9, 2001 Name of Receiving Stream/Index #: Little River / 18-23- (1) Classification of Water Body: WS-111 / HQW If Class SA, chloride sampling results: n/a Pond Depth, feet: 3.5 feet. (permanent pool) Permanent Pool Elevation 1~MSl1: 393.5 Drainage Area, acres: Total Impervious Surfaces, sq ft.- Mite Area entering Pond, sq ft: Required Surface Area, sq ft: Provided Surface Area, sq ft: Required Storage Volume, cu.fl.: Provided Storage Volume, cu.ft: Temporary Storage Elevation, FMS.L: Controlling Orifice: Required 85% TSS Filter: 3.85 90,604.80 None, per Engineer 9,056 9,112 . 10,089 18,068 396,0 3.00" pipe N/A, System designed for 90% TSS removal. 4 State Slonmvater Management Systems Fe mil t�foW . S£020t01 Project Name: Permit Number: Location: Applicant.: Mailing Address - DIVISION OF WATER QUALITY PROJECT DESIGN DATA SHEET Carotina Court SW6020101 Moore County Mike Gatti, Owner Post Office Box 602 Carthage, NC 28 327 Application Date: January 9, 2002 Name of Receiving Stream/index Little River 1 18-23-(1) Classification of Water Body: WS-1I1 i HQW Bio-.Retention .Basin Number. - Pond Depth, feet: Drainage Area, sq ft Dimensions, L x W, ft.: Total Impervious Surfaces, sq ft: Offsite Area entering fond, sq ft: Required Surface Area., sq ft.- Provided Surface Area, sq ft: Required Storage Volume, cu.ft: Provided Storage Volume, cuff Draw Down Time, hours: Minimum Stern Count: Number of Trees provided: Number of Shrubs provided: 1 6" 29,223 150' x 24' 20,037.60 111a 1,1.61.17 4,465 1,800 1,800 50.64 102 25 77 5 2 6" 52,473.38 260' x 25' avg. 37,462 n/a 3,077.78 6,532 3,250 3,250 62.17 150 38 112 titate Stormwater Management Systems Permit No. SWGOZIIt01 1111. SCHEDULE 01+ COMPLIANCE The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the constriction of any built -upon surface. 2. During constriction, erosion shall be kept to a minimum and any eroded areas of the system will he repaired immediately. The permittee shall at all time,; provide the operation and maintenance necessary to assure the permitted stormwater system f inctions 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 linuted to: a. Semiannual scheduled inspections (every 6 months), h. Sediment removal. C. Mowing, and revegetating 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. h. The wet detention pond for Carolina Court permit No. SW6020101 was designed to remove 90% TSS, therefore a vegetated filter was no required. The vegetated Filter if required will be kept grassed with no erosion. The spreader mechanism will be kept free of sediment and trash, and must distribute the runoff evenly over the width of the filter. 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of nWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken. Decorative spray fountains will not be allowed in the stormwater treatment system. 6The facilities shall be constructed as shown on the approved plans. 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. 7. 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. 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. no State Stormwater Management Systemp Permit No. Sw6020MI 9. A modification must be permitted prior to any construction. The following items will require a modification to the permit. The Director may determine that other revisions to the project should require a modification to the permit: a. Any revision to the approved plans, regardless of size. b. Proiect name change. c. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area. C. 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. 10. 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. 11. The permittee shall submit final site layout and grading plans for any permitted fitture areas shown on the approved plans, prior to construction, If the proposed RUA exceeds the permitted amount, a modification to the permit niust be submitted and approved prior to construction. 12. Prior to the sale of any portion of the property, an acces,"dmaintenance easement to the stormwater facilities shall be granted in favor of the permittee if access to the stormwater facilities will be restricted by the sale of any portion of the property. 13. The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable. built. -upon area. 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 subrtvt a written time schedule to the Director of 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. The permittee shall notify the Division of any name, ownership or mailing address changes within 30 days. 11.1. GENERAL CONDITIONS 1. 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 formal permit request must be submitted to the Divisit n of Water Quality accompanied by an application fee, documentation from the parties involved, and other supporting materials as may be _-appropriate. appropriate. The approval of this request will be considered on its merits and may or may -- not be approved. 7 State slormwater Managenlen( Syste1w; Permit No. SW6020 101 2. Failure to abide by the conditions and limitations contained in this permit may subject the Pennittee to an enforcement action by the Division of Water Quality, in accordance with North Carolina General Statutes 143-215,6A to 143-215.6C. The issuance of this permit does not preclude the Perrnittee 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. 4. 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. 5. The permittee grants D.ENR Stan permission to enter the property for the purpose of inspecting all components of the permitted stormwater management facility. 6. The permit may he 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. 7. unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina. Erosion and Sediment Control Planning and Design Manual, Permit issued this the 18th day of January, 2002. NORTH CAROLINA,ENVIRONMENTAL MANAGEMENT COMMISSION Gregory rho'rpe,'-Kp., Acting Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW6020101 8 State Stormwater Managenteiil Systems Penuil No, SW60201 01 Carolina Court. Stormwater Permit No. SW6020101 Moore County Designer's Certification as a duly registered In the State of North Carolina, having been authorized to observe (periodically/weekly/frill time) the construction of the project, (Protect) for _ (Project Owner) hereby state that, to the nest of my abilities, due care and diligence was used in the observation of the project constniction 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 is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date 9 SEAL State Stormwater Management Systems Nni it Into. SitiW20101 Certification Requirements: _1. The drainage area to the system contains approximately the permitted acreage. —2. The drainage area to the system cbritains 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,, The outlet/bypass stricture elevations are per the approved plan. _5. The outlet structure is located per the approved plans. _6. Trash racy is provided on the outlet bypass structure. —7. All slopes are grassed with permanent vegetation. _9. Vegetated slopes are no steeper than 11. —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. —11. 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 shell, and a forebay. _14. The overall dimensions of the system, as shown on the approved plans, are provided. cc: NCDENR-DWQ Regional Office Gene Opd_yke, Whispering Pines - Planning/Zoning/Inspections NCDENR/ DWQ/Fayetteville Regional Office INI t 'OFFICE USE`OIsiCY+ Date Received Fee Paid Permit Number State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for- use as an original I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): Mike Gatti 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): 3. Mailing Address for person listed in item 2 above: Post Office Box 602 City: Carthage State: NC Zip: 7.377 Telephone Number: ( 910 ) 947-3144 4. Project Name (subdivision, Facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Carolina Court 5. Location of Project (street address): 7454 N.C. Highway 22 City: Carthage County: Moore G. Directions to project (From nearest major intersection): 1.2 miles north on N.C. Highway 22 from the inter s.e_c_tia of N-C.. Highway 22 5 SR 1843 (Airport Road) 7. Latitude: 35_ degrees-._X_4' 40" Long itude:--Ts_degr-ees-24-30" of project 8. Contact person who can answer questions about the project: Name: Pat S. Willett it, PERMIT INFORMATION: 1. Specify whether project is (check one) Telephone Number: X New Renewal 910 1 692-5616 Modification Form SWU-101 Version 399 Pave I of 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number and its issue date (if known) 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 404/401 Permit X NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project . Storm water will be collected with a series of area drains and piped to wet detention pond with a fore bay. Two (2) bioretention areas _will _beuutilized also. 2. Stormwater runoff from this project drains to the _____Cape_ Fear _________ River basin. 3. Total Project Area: 11.38 acres 4. Project Built Upon Area: 29.88 % 5. How many drainage areas does the project have? .4 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Wet Pond Bio-2 Basin Inforrrm'ation f. Drainage Area l' Drainage,Areaf2. " Receiving Stream NameLittle RLyer Little River Receiving Stream Class WS-111 H W WS—ITT HQW Drainage Area 3.85 1.20 Existing Impervious* Area Proposed Impervious*Area 2.08 0.86 % Impervious* Area (total) 54X 72% Impervious` Surface Area . ^ Drainage Area 1 Drainage;A'rea 2�',. On -site Buildings 0.85 On -site Streets 0.74 0.66 On -site Parking 0.42 0.18 On -site Sidewalks 0.07 0.045 Other on -site 0 Off -site 0 0 Total: 2.08 Total: 0.86 * Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Forrn SWU-101 Version 3.99 Pace 2 of 4 2. If this application is being submitted as the result of a renewal or modification to an existing permit., list the existing permit number and its issue date (if known) 3. Specify the type of project (check one): Low Density High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): _CAMA Major _Sedimentation/Erosion Control 404/401 Permit _NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748, >006 Di Iv 00Y I >} 0& i a 111 >� O 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing Stormwater management for the project . 2. Stormwater runoff from this project drains to the 3. Total Project Area: acres 5. i-low many drainage areas does the project have? 4. Project Built Upon Area: }liver basin. 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. Rin-1 Area 04 Basin Information Drainage Area 1 Drainage Area 2 Receiving Stream Name Little River Little River Receiving Stream Class WS—III — H. .W. WS—III — H.Q.W. Drainage Area 0.67 0.27 Existing Impervious* Area 0 0 Proposed Impervious*Area % Impervious* Area (total) 69Z 741 Impervious* Surface Area Drainage Area 1 Drainage Area 2 On -site Buildings 0.11 0.18 On -site Streets 0.25, 0.021 On -site Parking 0.10 0 On -site Sidewalks 0 00 Other on -site 0 0 Off -site; 0 0 Total: 0.46 Total: 0.20 " Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Fonn 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 covenants are intended to ensure ongoing compliance with state storrnwater 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. Z. No more than 160, 000 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 ofswitnining pools. 3. Swales shall riot 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 storrnwater management permit modification prior to construction. 5. All permitted runoff from outparcels or future development shall be directed into the permitted stortnivater control systern. These connections to the storrnwater control system shall be performed in a manner that maintains (lie 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 FOIZMS 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 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Paee 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 ?2&1 • One copy of the applicable Supplement Form(s) for each BMP V5u1 • Permit application processing fee of $420 (payable to NCDENR) Ld • Detailed narrative description of stormwater treatment/management • Two copies of plans and specifications, including: 5 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) VI1. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm) Hobbs, Upchurch & Associates, P.A. Mailing Address: Post Office Box 1737 City: Southern Panes State: NC Zip: 28388 Phone:{ 910 } 692-5616 Fax:{ 910 ) 692-7342 VIII. APPLICANT'S CERTIFICATION 1, (print or type name of Iverson listed in Genera! Information, item 2) Mike Gatti certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC 21-1 .1000. Signature: Date: i0-3f 'OI Form SWU-It}l Version 3.99 Pm,c 4 of 4 Permit No. (to be provided by 1)WQ) 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 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: Carolina Court Contact Person: Mike Gatti Phone Number: (_ 91O) 947-3144 For projects with multiple basins, specify which basin this worksheet applies to: Pond #1 elevations Basin Bottom Elevation 390-00 ft. (floor of'the basin) Permanent Pool Elevation 393.50 ft. (elevation of the orifice) Temporary Pool Elevation 396.00 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 9372 sq. ft. (water surface area at the orifice elevation) Drainage Area . _3.85 ac. (on -site and off -site drainage to the basin) Impervious Area 2.08 ac. (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 20,271 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 66,.6 4._ cu. ft. (volume detained above the permanent pool) Forebay Volume 18,295 cu, ft. (approximately 20% of total volume) Other parameters ; foC ✓ fl`d"f`3� �,,.... �,. a l0' SAIDA 5.44 ¢r+ (sauface area to drainage area ratiofrom DWQ table) Diameter of Orifice in. (2 to 5 day temporary pool draw -clown required) S" = d`7 Design Rainfall 1 in. Design TSS Removal 2 90 % (mininnun 85% required) (Coastal Soils) Form SWU-l02 Rev 3 99 Page l of 4 Footnotes: When using the Division SA/DA tables, the correct SAIDA ratio for permanent pool sizing should be computed based upon the actual impervious % and pennanent pool depth. Linear interpolation should be employed to determine the correct value for non- standard table entries, In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to pr ovide 90%TSS removal. The NCD1 NR BMP manual provides design tables for both 85%TSS removal and 90%TSS removal. 1I. 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. Applicants Initials 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 stone event. rcJ 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) _,A/ I t c— 5� 5 ' Z 7-5 5 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). c , i. Vegetative cover above the permanent pool elevation is specified. 5 �) 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 acc f ss to nearest right- of-way. iP-;I. 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. 5 m. A mechanism is specified which will 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 if one is provided. This system (check one) 0 does 0 does not incorporate a vegetated filter at the outlet. This system (check one) 0 does 0 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 runoffproducing 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. 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 (Le. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 1.50 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 0.38 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks Permanent Pool Elevation 396.00 Sediment Re val El. �75D Lon g4�88Sediment Removal Elevation 391.50 -------------------------------------------J25% ottom a 390.00 Bottom Elevation 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 rushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-102 Rev 3.99 Page 3 ol'4 7. All components of the wet detention basin system shall be maintained in good working order. I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: V. Mike Gatti Title: Owner Address: Post Office _Boa 602. Carthage-, NC 2R377 Phone: Signature: *7 Date: 10-25-01 Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, Pat S _ Willett , a Notary Public for the State of forth Carolina County of Chatham , do hereby certify that Mike F. Gatti personally appeared before me this 25 day of October , 2001 , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, SEAL My commission expi Form SWU-102 Rev 3.99 Page of . � �,,OFFICE^l]SE ONL Y Date Received Fee Paid Permit Number [' 3 P. Pt , . . State of North Carolina n Department of Environment and Natural Resources' Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION This form may be photocopied for use as an original i. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): Hike Gatti Nov _ 5 200 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): M41ro ems**; _ rk,.,__ 3. Mailing Address for person listed in item 2 above 0 L'`Vr Post Office Box 602 City: Carthage - State: NC Zip: 78327 Telephone Number: 910 947-3144 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Carolina Court 5. Location of Project (street address): 7454 N.C. Highway 22 City: Carthage County: Mnnrn 6. Directions to project (from nearest major intersection): 1.2 miles north on N.C. Highway 22 from the intersection of N_c- Highway 22 & SR 1843 (Airport Road) 7. Latitude: 35 degrees_ 14' 40" , _ Longitude:_79 Aegree . 1+ of project 8. Contact person who can answer questions about the project: Name: Pat S. Willett Telephone Number: ( 910 j 692--5616 11. PERMIT INFORMATION: 1. Specify whether project is (check one): X New Renewal Modification Forrn SWU-101 Version 3,99 Page i of Z. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number and its issue date (if known) 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 404/401 Permit X NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project . Storm water will be collected with a series of area drains and piped to wet detention pond with afore bay. Two (2) bioretention areas will beuutilized also. 2. Stormwater runoff from this project drains to the _____Cape_Fear W________________ River basin. 3. Total Project Area: 11.38 acres 4. Project Built Upon Area: 29.88 % 5. How many drainage areas does the project have? -4 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Wet Pond Bio-2 B'a'srn Irifo`rmation' r` ;'$ t ?�DiaEnagqe Area 1 s ,� s, 9, �!:'rr .. D.r y .L • s+.; �;, ,._rainagWf rea 25`sk,��r�'#t = t+LrNr .q".e ��.. Receiving Stream Name Little River Little River Receiving Stream Class WS_III H W WS—III HQW Drainage Area 3.85 1.20 Existing Impervious' Area Proposed Impervious`Area 2.08 0.86 % Impervious` Area (total) 54Z 72% Im`perviou`sSurface Area, '_}``r Drainage Area 1 Drairiage'sA"ieaa2?�",t� w° On -site Buildings 0.85 0.30 On -site Streets 0.74 0.66 On -site Parking 0.42 0.18 On -site Sidewalks 0.07 0.045 Other on -site 0 Off -site 0 0 Total: 2.08 i Total: 0.86 ` Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sideivalks, gravel areas, etc. Form SWU-101 Version 3.99 Pate 2 of 4 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number and its issue date (if known) 3. Specify the type of project (check one): Low Density High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): _CAMA Major —Sedimentation/Erosion Control 404/401 Permit YNPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. >006 II R 6h(i )61)< i b B 1 x1 b 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing Stormwater management for the project . 2. Stormwater runoff from this project drains to the 3. Total Project Area: res 4. Project Built Upon Area: River basin. 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. Bio-1 Area #4 ,Basih Information g€, ; P. F� % ' Dramage:Area 1'" .$.....x �.4 :.-.f.' ,:C tf N{5. �. '_... '�P'' ,- �e-. ,...a-. ... -. 2. 1 "� ,Drainage Areal f .r::.,s, m. �-.[P Yfi M"F' "i.... � X.'1P%i�nS . .. _. ...� Receiving Stream Name Little River Little River Receiving Stream Class WS—III — H.Q.W. WS—III — H. .W. Drainage Area 0.67 0.27 Existing Impervious" Area 0 0 Proposed lmpervious`Area % Impervious" Area (total) 692 741 .-'P _ , .� Impervious Surface Area . g . :� r 4 ,a�n. :� . DraTn ge,�Areal€hE.ra �r "Dratna e'Area 2 e On -site Buildings 0.11 0.18 On -site Streets 0.25 0.021 On -site Parking 0.10 0 On -site Sidewalks 0 f o Other on -site 0 0 Off -site 0 0 Total: 0.46 Total 0.20 w Impervious area is defined as the built upon area including, but not lirnited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form SWU-101 Version 3.99 Page 2 of 1-1 ow 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 covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality. These covenants may riot be changed or deleted without the consent of the State. 2. No more than 160.000 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 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. S. 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 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Pane 3 of 4 V1. SUBMITTAL REQUIRE31NlENTS 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. 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form • One copy of the applicable Supplement Form(s) for each BMP,� • Permit application processing fee of $420 (payable to NCDENR)!�„� • Detailed narrative description of stormwater treatment/management ��rJ • 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 storm water 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 information on your behalf, please complete this section. Designated agent (individual or firm): Hobbs, Upchurch 6 Associates, P.A. Mailing Address: Post Office Box 1737 City: Southegn Pines State: NC Zip: 28388 Phone:( 910 } 692-5616 Fax:{ 910 } 692-73 2 VIII. APPLICANT'S CERTIFICATION I. (print or type name of person listed in General Information, item 2) Mike Gatti 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 N C A C 21-1 .1000. Signature: _M;9_ r+ Date: Io .?l `O ( Dorm SWU-101 Version 3,99 Pa,_,c 4 ofrt Permit No. (to be provided by DiVQ) 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 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: Carolina Court Contact Person: Mike Gatti Phone Number: ( 910) 947-3144� For projects with multiple basins, specify which basin this worksheet applies to: Pond 01 elevations Basin Bottom Elevation 190-0o ft Permanent Pool Elevation 393.50 ft Temporary Pool Elevation 396.00 ft (floor of the basin) (elevation of the orifice) (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 9322 sq. ft. (water surface area at the orifice elevation) Drainage Area 3.85 ac. (on -site and off -site drainage to the basin) Impervious Area 2.08 ac. (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 20,271 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 66.614 cu. ft. (volume detained above the permanent pool) Forebay Volume 18,295 cu. ft. (approximately 20% of total volume) Other parameters SA/DA I Diameter of Orifice Design Rainfall Design TSS Removal 2 5.44 8 in. 1 in. 90 °/o (surface area to drainage area ratio from DWQ table) (2 to 5 day temporary pool draw -down required (minimum 85% required) (Coastal Soils) Form SWU-102 Rev 3.99 Page i of 4 Footnotes: When using the Division SAIDA 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. In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to pr ovide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal. I1. 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. Applicants Initials 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. r� 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) /Jr ,�c� ccl-u4( d��-"- 7' 5 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. A trash rack or similar device is provided for both the overflow and orifice. k. P54-J, 1 A recorded drainage easement is provided for each basin including ace ss to nearest right- of-way. -f Y_ 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. 25 m. A mechanism is specified which will 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 if one is provided. This system (check one) 0 does 0 does not incorporate a vegetated filter at the outlet. This system (check one) 0 does 0 does not incorporate pretreatment other than a forebay. Fonn SWU-102 Rev 3.99 Page 2 or4 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 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 (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.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 1.50 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 0.38 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM Oil in the blanks) Permanent Pool Elevation 396.00 Sediment Re val El. 3g4.88 75° __ Sediment Removal Elevation 391.50 75% Bottom Ele anon 50 2 ---------------------------------------------J25/. Bottom Elevation 390.00 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. Form SWU-102 Rev 3.99 Page 3 of 4 7. All components of the wet detention basin system shall be maintained in good working order. I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: " Mike Gatti Title: Owner ___ Address: Post Office Box 602. Phone: �,, Signature: ^TlL 41 4. U.--Q,E Date: 10-25-01 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,Pat S. Willett , a Notary Public for the State of _North Carolina , County of Chatham , do hereby certify that Mike F. Gatti personally appeared before me this 25 day of October , 2001 , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, SEAL My commission expire Form S W U-102 Rev 3.99 Page 4 of 4 NC®ENR North Carolina Department of Environment and Natural Resources Michael F. Easley, Governor William G. Ross Jr., Secretary October l 1.2001 Gregory J. Thorpe, Ph.D. Acting Director Mr. Mike Gatti, Owner Division of Water Quality Carolina Court PO Box 602 Carthage. NC 28327 SUBJECT: APPLICATION No. SW6001101 Additional Information Request Carolina Court High Density (11QW) 5tormwater Project Moore County, NC Dear Mr. Gatti: This otTicc has completed a preliminary engineering review ofthe subject application. The (bllowing items must be addressed before vve can complete our rovicvv: V� Please provide docunientation that the Village oi' W hispering Pines has approved DVS - I Il High Density. that exceeds 50% impervious area. 1 SA NCAC 02B .0215 (3)(b)(B) which states "High Density Option: If new development density exceeds the love density option requirement specified in Sub -Item (3)(b)(1)(A) or this Rule then development must control runoff from the (first inch of rainfall; new residential and non-residential development shall not exceed 50 percent built -upon area;" I5 NCAC 02B .0215 (3)(b)(G) requires a minimum 100 foot vegetative buflcr is required for all new devclopinetit activity that e:~ceed the low density requirement as specified in Sub -Item (3)(b)(1)(A) and Sub -Item (3)(b)(n)(A) or this Mule, other,vise a niiniinurn 30 foot vegetative buffer development is required along all perennial waters. 2. Please make all necessary rev,.sions ;find sub -nit an applicntion that includes: origirnl / signatures and initials.-- 3. Page 2 of 4 111 No. 5 of application indicates (1) drainage area but project has (3) drainage area's that must be broken down and shown under No. 6 of page 2 of 4. Please slow drainage areas in acres or square feet. - r 4. l•orebay volume of wet detention basin supplement should be no more than 20'%) of the total volume. r 5. Please vcrif-v SA/DA ratio numbers as provided. The SA/Da table 1, l as referenced in your f application is based upon 85%TSS removal in the piedmont. A vegetative filter is required for 85 '0 removal in coastal and piedmont counties. A vegetative filter is not required for 90% removal. Note 90%, removal tables exist only for coastal plains soil [-,-PCs. Fayetteville Regional Office 225 Green Street - Suite 714, Fayetteville, North Carolina 28301-5043 Phone: 910-486-1541 1 FAX: 910.436-07071 Internet: NR An Equal Opportunity l Affirmative Action Employer - 50% Recycled 110% Post Consumer Paper Mr. Gatti Page - 2 October 11. 2001 6. Show, calculations or method for the detention basin's regikired, provided, and temporary volumes. - 7. Chcck Page - I of supplement that indicates Orifice diameter to be 12 inches. 8. Maintenance agreement needed for Bioretention systems. Q. All buildings must be included in appropriate drainage area. Note - All roof drains mast be noted on plans as draining to the appropriate system. 10. Delineate the Wetlands (provide a symbol in the legend) or note on the plans that there are f { no wetlands on site. ,. .r• : 11. Aquatic vegetation must be included for a wetland type detention basin. A minimum ten foot wide shallow sloped shelf is needed at the edge of the basin for safety and to provide appropriate conditions for aquatic vegetation. This shelf should be sloped 6):1 or flatter and extend to a depth of 2 feet below the surface of the permanent pool. A list of suitable wetland species and propagation techniques are provided in Schucler (1987) and Maryland DNR (1997). 12. Provide permanent pool dimensions. 13. Include a detailed outlet structure with trash rack = <4" and screen of orifice in plans/spec. 14. Specil'y vegetation (grass) on 3:1 slopes (seed schedule) (SEQ If a [nodil-ication, have you considered the ramifications of the changes" For example, char -ing a drainage area means revising the calculations, supplement form and application, Adding built -upon area n quires the same revisions. Ma1:c sure all the documentation matches up with the new information. Please reference the project number above on all correspondences. If you have any questions, please call me at (910) 480-1541. Sincerely, Ricky Revels Environmental Technician cc: Pat S. Willett, Hobbs, Upchurch & Assoc. Chris Parillo, Planning & Zoning Administrator - Whispering Pines; NC F't[!s[sRs�NiEW3401�\[(x)REkl wW,Qnl [atAUKV,'oN VTI CAROLINA COURT Bio Retention Maintenance Guidelines and Maintenance Agreement A schedule of recommended maintenance for bioretention areas is given in the attached table. The table gives general guidance regarding methods, frequency, and time of year for bioretention area maintenance. Planting Soil Urban plant communities tend to become very acidic due to precipitation as well as the influences of stormwater runoff. For this reason, it is recommended that the application of an alkaline substance, such as limestone, be performed once a year. Testing of the pl-I of the organic layer and soil should precede the limestone application to determine the amount of limestone required. Sol] testing should be conducted annually so that the accumulation of toxins and heavy metals can be detected and/or prevented. Data suggest accumulation of toxins and heavy metal can be expected within 5 years of installation. As the toxic substances accumulate, the plant biological functions may become impaired, and the plant may experience dwarfed growth followed by morality. The biota within the soil can also perish and the natural soil chemistry may be altered. The preventative measures would include the removal of the contaminated soil. In some cases, removal and disposal of the entire soil base, as well as the plant material, may be required. This will be based on annual soil testing results and visual inspection of plantings. 2. Mulch 1ioretention areas should be mulched once the planting of trees and shrubs has occurred. Any ground cover specified as plugs may be installed once the area has been mulched. Ground cover established by seeding and/or consisting of grass should not be covered with mulch. Plant Materials An important aspect of landscape architecture is to design areas that require little maintenance. Certain plant species involve maintenance problems due to dropping of fruit or other portions of the plant. Another problem includes plants, primarily trees, that are susceptible to windthrow, which creates a potential hazard to people and property (parked cars). As a result, some plant species will be limited to use in low traffic areas. Ongoing monitoring and maintenance is vital to the overall success of bioretention areas. Annual maintenance will be required for plant material, mulch layer, and soil layer. The maintenance schedule will be followed to maintain the bioretention areas. Carolina Court Maintenance Schedule for Bioretention Areas Description Method Frequency Time of Year Soil Inspect and Repair Visual Monthly Monthly Erosion Organic Layer ReInUIC11 any void area By hand Whenever needed Whenever needed Remove previous mulch By hand Once every two or three Spring layer before applying years new layer (optional) Any additional mulch By hand Once a year Spring added Plants Remove and See planting Twice a year 3/15 to 4/30 and 10/1 to replacement of all dead specifications 11/30 and diseased vegetation considered beyond treatment Treat all diseased trees Mechanical or by hand NIA Varies, but will depend and shrubs on insect or disease infestation Watering plant material By hand Immediately after NIA shall take place at the completion of project end of each day for fourteen consecutive days and after planting has been completed Replacement of support By hand Once a year Only remove stakes in stakes the spring Replace any deficient By hand Whenever needed Whenever needed stakes or wires I acknowledge and agree by my signature below that I am responsible for the performance of the bioretention maintenance procedures for Carolina Court 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: ��4E� �. t�A—J Title:�� Address: � Q.� ... n��(� n �D 4 ]zTNF� Phone:() — F/ l =3/¢0 Signature: AA"—. Date. I , — 3 i - c) 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 oflf�r�yy► _, do hereby certify that Personally appeared before me thi � day of and acknowledge the due execution of the foregoing wet detention basin maintenance requirements. Witness my hand and official seal, EAL My commission expires e =I Pond #1 Detention Basin Design Determine Surface area and volume required Drainage Area = 3.85 Acres Impervious area = 2.08 Acres % Impervious From Table I.1 of NCDENR Stormwater Best Management Practices SA/DA = Depth = 3.5 ft BASIN DIMENSIONS Len h Width L/W Ratio 94 25 3.76 :1 Sideslopes 6 :1 DETERMINE STAGE -STORAGE FUNCTION S Z CONTOUR INCR ACCUM CONTOUR AREA VOLUME VOLUME STAGE Required Surface Area Basin Surface Area 54.00 % 5.40 9056 SF 9112 SF y X In S In Z Z est FT S . FT CU. FT CU. FT FT FT 0 0 0 1 4401 2201 2201 1 7.696439886 0 1.00 2 6172 5287 7487 2 9.920923462 0,6931472 2.02 3 8168 7170 14657 3 9.592673316 1,0986123 2.99 4 10392 9280 23937 4 10,08318066 1,3862944 3.97 5 12841 11617 35554 5 10A7879388 1.6094379 4.99 5.5 15517 7089 42643 5.5 10.66061613 1.7047481 5.54 From Linear Regression Ks = 2215 b = 1.73 corr. = 0.9999 Pond #1 DETERMINE VOLUME TO BE CONTROLLED BY 1-INCH STORM Calculate Rv Rv = 0.05 + 0.009 * I VOLUME TO BE TREATED Volume = Rainfall * Rv * Drainage Area Rainfall= 1 in STAGE -STORAGE function KS = 2215 b = 1.73 ORIFICE REQUIRED Drawdown time Say Qo Set riser Z Volume to drain Rv = V= Say V = 2-5 Days Qreq. 3.5 Days Cd = Cd * (pi*DA2/4) * (2g * ((Z-0)/2))^(1/2) D (in) D (ft) Qo(cfs) Drawdown (days) Remark 1.25 0.10 0.0687 1.34 Too Fast 1 0,08 0.0439 2.10 Too Fast 0.75 O.t)6 0.0247 3.74 OK 0.54 in/in 0.1720 acre-ft 7491 of Z= Z= El (riser) _ 7979 of 0.0264 cfs 0.6 2.0246 2.1 5.6 Pond #1 PIPE TO DRAIN POND Qo = Cd * (pi*D^214) * (2g * ((Z-0)/2))^(1/2) Riser Depth = 5.6 ft Riser Depth Volume = 43433 cf D (in) D (ft) Qo(cfs) Drawdo►vn (hrs) Remark 4 0.33 0.7031 17.16 OK DETERMINE PRE DEVELOPMENT AND POST DEVELOPMENT RUNOFF COEFFICIENTS Pre Development Use C Area ac % Area '% * C Pavenit/13idg 0.90 0 0.00% 0.00% Pinewoods 0.30 3.9 100.00% 30.00% Total: 3.9 Use C= 30% Post Development Use C Area (ac) '% Area % * C P,tvemtfBldg 0.90 2.08 54.03% 48.62% Turf 0.30 1.77 45.97% 13.79% Total: 3.85 Use C = G2 Pond #1 DETERMINE PRE DEVELOPMENT AND POST DEVELOPMENT CURVE NUMBER Pre Develown nt Land Use HSG CN Catchment No, 1 Area Wt. CN (A CRES) Open Space B 61 3.85 61.00 C 74 0.00 D 80 0.00 Streets & Roads (Pavement & Buildings) B 98 0.00 C 98 0.00 D 98 0.00 B C D 98 98 98 0.00 Totals: 3.85 61.00 Use CN: 61 Post Development Land Use HSG CN Catchment No. 1 Area Wt. CN (ACRES) Turf B 61 1.77 28.04 C 74 0.00 D 80 0.00 Streets & Roads B 98 2.08 52.95 C 98 0.00 D 98 0.00 0.00 Totals: 3.85 80.99 Use CN: 69 Pond #1 SET CREST OF RISER AT WATER QUALITY STAGE Set riscr at water quality stage + Permanent Pool Stagc(WQ): 2,02 ft Say 2.1 Riser Elevation: COMPUTE ALLOWABLE OUTFLOW Qpre= 7.1 cfs See "Peak Inflow" sheet Qpost = 14.6 cfs 10 yr flood ESTIMATE STORMWATER STORAGE NEEDED S = (Qpost - Qpre) * Tp *60 seclmin S= If S is neg. (Qpre > Qpost) S = 1.39 * Qpost * Tp DETERMINE TOTAL STORAGE Total Storage = Flood Storage + Water Quality Total Storage = Total Stage = CONFIGURE OUTLET Select Riser by Orifice Equation Cd = h = ((0.159 * Q)/(Cd * DA2))^2 h is to Centerline of barrel Set uD Trial and Error table S= S needed = Qp = Tp = Tp = 18068 cf 3.37 ft Z D (inch) D (ft) h (ft) h + D12 (ft) 0.75 0.06 232000.21 232000,24 1 0,08 73406.32 73406.36 1.25 10.1041667 1 30067.23 1 30067.28 5.66 ft 10089 cf 455 cf 10089 cf 7.1 cfs 32.40 min. 22.42 min. Try barrel = 6 Route to confirm Riser = 9 Pond #1 FOREBAY VOLUME REQUIRED—, i Total Storage = 18068 cf ( Total Storage) Fore Say Volume = 20% Total Volume Fore Bay Volume = 3614 cf Forebay Dimension Try Length Width 20 12 Area = (Length + (2*Depth*Sideslope))*(Width + (2 *Depth* Sideslopes) Depth 4 ft Area = 1584 sf Sideslopcs 3 :1 Volume = (Average Area*Depth) Volume = 3648 CF SEDIMENT STORAGE From "Sediment predictions in Eastern United States" Malcom, H.R. and Smallwood, C., (1977) Where.. (for Urbanized) V = 2.96 * A^0.67 V = Sed. Volume (acre-ft/year A = Area (sq. miles) V = 0.096252 acre-ftlyear 4193 cf/year Cleanout interval 2 Years Volume= 8385 of Total Volume Needed for Pond = (ceanout volume - (0.25 * Forebay volume)) = 7473 cf Pond tl 1 Peak Inflow HUA No. WP9906 Gatti Tract Whispering Pines, NC DESIGN STORM: 25-Year, 24-Hour Depth; 25-Year Intensity BACKGROUND: Use the Rational Method REFERENCES: (Malcom, 1991; Wanrelista, 1990) SOLUTION - Qp: Use the Kirpich Equation & the Rational Method INPUT OUTPUT Pre Development SOLUTION - Tp: TERMINOLOGY: L = 500 ft H = 10 ft A = 3.85 acres C = 0.30 INPUT P = 6.44 in CN = 87 A = Watershed Area, (acres) a = Statistical Variable b = Statistical Variable C = Runoff Coefficient CN = Curve Number H = Vertical Relief, (ft) = Rainfall intensity, (in/hr) FINAL RESULTS: Qp = 7 CFS 11 Tp = 116.90 MINUTES Tc = 10.00 minutes I = 6.13 in/hr Qp = 7 efs OUTPUT S = 1.49 in Q* = 4.94 in Tp = 116.90 minutes L = Hydraulic Lenth, (ft) P = Precipitation Depth, (in) Q* = Runoff Depth, (in) Qp = Peak Discharge, (cfs) S = Ultimate Soii Storage, (in) Tc = Time of Concentration, (minutes) Tp = Time to Peak, (minutes) Pond # 1 Peak Inflow HUA No. WP9906 Gatti Tract Whispering Pines, NC DESIGN STORM: 25-Year, 24-Hour Depth; 25-Year Intensity BACKGROUND: Use the Rational Method REFERENCES: (Malcom, 1991; Wanielista, 1990) SOLUTION - Qp: Use the Kirpich Equation & the Rational Method INPUT OUTPUT Post Development SOLUTION - Tp: TERMINOLOGY: L = 500 ft H = 10 ft A = 3.85 acres C = 0.62 INPUT P = 6.44 in CN = 87 A = Watershed Area, (acres) a = Statistical Variable b = Statistical Variable C = Runoff Coefficient CN = Curve Number H = Vertical Relief, (ft) 1= Rainfall Intensity, (in/hr) FINAL RESULTS: Qp = 15 CFS Tp = 56.57 MINUTES Te = 10.00 minutes I = 6.13 in/hr Qp = 15 cfs OUTPUT S = 1.49 in Q* = 4.94 in Tp = 56.57 minutes L = Hydraulic Lenth, (ft) P = Precipitation Depth, (in) Q* = Runoff Depth, (in) Qp = Peak Discharge, (cfs) S = Ultimate Soil Storage, (in) Tc = Time of Concentration, (minutes) Tp = Time to Peak, (minutes) Pond # 1 Chainsaw Routing (REF. Malcom, 1991) IIUA No. WP9906 Gatti Tract Whispering Pines, NC Design Storm: 25-year Pond must detain inch of rainfall runoff fro all pervious surfaces RESULTS Q.T = 2 CFS Z.rsvr = 7.01 FT 'F-S.nrm = 53,975 CU-FT Q.pr = 0 CFS Z.s = 0.00 FT W SA.max = 15,877 SQ-FT FRBD.min = 1.49 F'r V.s = 0.0 FPS T-S.max = 64,329 CU-FT WSEL.nrm = 3.00 FT Q.s = 0 CFS WSA.nrm = 8,545 SQ-FT SEL.max = 7.01 FT T-S.det = 42,810 CU-FT INPUT Qp = 15 CFS N.r = I Cws = 3.00 Tp = 56.57 MIN Cwx = 3.30 Ct.s = 2.45 dT = 4 MIN Cd.r = 0.60 B.s = 2.00 FT M= 6 :1 Ks = 2215 b = 1.73 D.r = 0.75 FT ELs = 7.50 FT N.b = l EL.dam = 8.50 FT Cd.b = 0.60 EL.r = 5.50 FT EL.i = 0.00 FT D.b = 6 INCH EL.r = 5.50 FT OUTPUT A B C D B F G H I Time T Inflow I Storage S Elevation WSEL Outflow 0 Riser O.r-w Riser O.r-o Barrel O.b Spillway O.s MIN CFS CU-FT FT CFS CFS CFS CFS CFS 0 0 11165 3.00 0 NA NA NA 0.0 4 0 11165 2.55 0.00 0.0 0.0 1.4 0.0 8 1 11209 2.55 0 0.0 0.0 1.4 0.0 12 2 11379 2.58 0 0.0 0.0 1.4 0.0 16 3 11753 2.62 0 0.0 0.0 1.5 0.0 20 4 12401 2.71 0 0.0 0.0 L5 0.0 24 6 13375 2.83 0 0.0 0.0 1.5 0.0 28 7 14714 2.99 0 0.0 0.0 1.6 0.0 32 9 16438 3.19 0 0.0 0.0 1.6 0.0 36 10 18549 3.42 0 0.0 0.0 1.7 0.0 40 12 21029 3.67 0 0.0 0.0 1.7 0.0 44 13 23842 3.95 0 0.0 0.0 1.8 0.0 48 14 26936 4.24 0 0.0 0.0 1.9 0.0 52 14 30245 4.53 0 0.0 0.0 2.0 0.0 56 15 33693 4.82 0 0.0 0.0 2.0 0.0 Pond 41 60 14 37196 5.11 0 0.0 0.0 2.1 0.0 64 14 40669 5.38 0 0.0 0.0 2.1 0.0 68 13 44026 5.63 0 0.4 0.8 2.2 0.0 72 12 47101 5.85 1 1.6 1.3 2.2 0.0 76 11 49705 6.04 2 3.1 1.6 2.3 0.0 80 10 51982 6.20 2 4.5 1.8 2.3 0.0 84 9 53975 6.33 2 5.9 1.9 2.3 0.0 88 8 55716 6.45 2 7.2 2.1 2.4 0.0 92 8 57231 6.55 2 8.4 2.2 2.4 O.0 96 7 58544 6.64 2 9.4 2.3 2.4 0.0 100 6 59675 6.71 2 10.4 2.3 2.4 0.0 104 6 60641 6.77 2 11.2 2.4 2.4 0.0 108 5 61458 6.83 2 11.9 2.4 2.4 0.0 112 5 62148 6.87 2 12.5 2.5 2.4 0.0 116 4 62725 6.91 2 13.0 2.5 2.4 0.0 120 4 63198 6.94 2 13.4 2.5 2.4 0.0 124 4 63577 6.96 2 13.7 2.6 2.4 0.0 128 3 63870 6.98 2 14.0 2.6 2.4 0.0 132 3 64085 6.99 2 14.2 2.6 2.5 0.0 136 3 64229 7.00 2 14.3 2.6 2.5 0.0 140 3 64308 7.01 2 14.4 2.6 2.5 0.0 144 2 64329 7.01 2 14.4 2.6 2.5 0.0 148 2 64293 7.01 2 14.4 2.6 2.5 0.0 152 2 64213 7.00 2 14.3 2.6 2.5 0.0 156 2 64087 6.99 2 14.2 2.6 2.5 0.0 160 2 63921 6.98 2 14.0 2.6 2.4 0.0 164 1 63718 6.97 2 139 2.6 2.4 0.0 168 1 63481 6.96 2 13.7 2.6 2.4 0.0 172 1 63215 6.94 2 13.4 2.6 2.4 0.0 176 1 62921 6.92 2 13.2 2.5 2.4 0.0 180 1 62602 6.90 2 12.9 2.5 2.4 0.0 184 1 62261 6.88 2 12.6 2.5 2.4 0.0 188 1 61900 6.86 2 12.3 2.5 2.4 0.0 192 1 61519 6.83 2 11.9 2.5 2.4 0.0 196 1 61123 6.81 2 11.6 2.4 2.4 0.0 200 1 60711 6.78 2 11.2 2.4 2.4 0.0 204 1 60287 6.75 2 10.9 2.4 2.4 0.0 208 1 59857 6.72 2 10.5 2.4 2.4 0.0 212 0 59420 6.70 2 10.2 2.3 2.4 0.0 216 0 58979 6.67 2 9.8 2.3 2.4 0.0 220 0 58534 6.64 2 9.4 2.3 2.4 0.0 224 0 58086 6.61 2 9.1 2.2 2.4 0.0 228 0 57638 6.58 2 8.7 2.2 2.4 0.0 232 0 57189 6.55 2 8.3 2.2 2.4 0.0 236 0 56740 6.52 2 8.0 2.1 2.4 0.0 240 0 56292 6.49 2 7.6 2.1 2.4 0.0 244 0 55845 6.46 2 7.3 2.1 2.4 0.0 248 0 55402 6.43 2 7.0 2.0 2.3 0.0 252 0 54960 6.40 2 6.6 2.0 2.3 0.0 Anti -Flotation Calculations Riser in Detention Pond HUA No. WP9906 Gatti Tract Whispering Pines, NC Max. WSEL = 7.50 FT Riser Invert = 0.00 Riser Diameter = INCHES Riser Volume = 2.6 CF Riser Buoyancy = 163 LBS Barrel Diameter = 6.0 INCHES Barrel Length = 75.0 FT Barrel Volume = 14.7 CF Barrel Buoyancy = 919 LBS Slab Length = 3.50 FT Slab Width = 3.50 FT Slab Thickness = 1.25 FT Slab Buoyancy = 956 LBS Slab Volume = 15.3 CF Slab Weight = 2220 LBS Unit Wt. of Water = 62.4 LBS/CF it Wt. of Concrete = 145.0 LBS/CF Total Buoyancy = 2038 LBS Total Weight = 2220 LBS Factor of Safety = 1.09 (OK) NOTE: Factor of Safety must be at least 1.1 Storm Drainage Calculations HUA No. WP9906 Gatti Tract 25 Year Storm Whispering Pines, NC Total Inlet Pipe Segmt Upper Loiver Pie Area Area Turf Pave Time Time Tc I C AC Cc Q Slope n D.theo Size Mull L Time Invert Invert PiDe from to Inlets acres acres % % min min min in/hr cfs ft/ft in in fps. ft min ft ft from to CBI CB2 CBI 0.22 0.22 0.19 0.81 10.0 0.0 10.0 7.03 0.93 0.18 0.83 1.3 0.0343 0.012 6.3 15 10.6 166 0.3 410.20 404.50 C31 CB2 CB2 CB3 CB2 0.31 0.53 0.19 0.81 10.0 0.3 10.3 6.97 0.83 0.26 0.83 3.1 0.0284 0.012 9.0 15 9.6 198 0.3 404.50 398.87 CB2 CB -)A CB5 CB6 C135 0.25 0,25 0.18 0.82 10.0 0.0 10.0 7.03 0.50 0.13 0.50 0.9 0.0050 0.012 7.8 15 4.0 56 0.2 401,50 401,22 CB5 CB,'' CB6 CB7 CB6 0.07 0.32 0.18 0.92 10.0 0.2 10.2 6.98 0.93 0.06 0.57 1.3 0.0117 0.012 7.7 I5 6.2 104 0.3 401.22 400.00 CB6 CB.1 CB7 4 CB7 0.25 0.57 0.10 0.90 10.0 0.5 10.5 6.92 0.89 0.22 0.71 2.8 0.0060 0,012 11.7 15 4.4 80 0.3 400,00 399.52 CB7 4 3 4 0.10 0.67 0.18 0.82 10.0 0.8 10.8 6.86 0.83 0.08 0.73 ' 3.3 0.0060 0.012 12.5 15 4.4 108 0.4 399.52 398.87 4 3 3 out 3 0.53 1.73 0.19 0.81 10.0 1.2 11.2 6.78 0.83 0.44 0.79 9.2 0.0075 0.012 17.6 I8 5.6 80 0.2 398.87 398.27 3 oLt Detention Pond Planting The 10' wide minimum vegetated shelf with a 6' to 1' slope located within the permanent pool area shall be planted with the following: 1. Pond Weed "Scirpus Pungens" — Pond Weed accepts total inundation and supports waterfowl. It will be planted from the bottom to the pool EL 390.00 to EL 392.50. 2. Smart Weed "Polygonnum Spp"— Smart Weed accepts inundation of 1-foot and supports waterfowl and songbirds. It also tolerates fluctuating water levels. It will be planted from EL 392.50 to 394.25. 3. Common Three -Square "Scirpus Pungens" — Common Three -Square accepts up to 6" of inundation. It is a fast colonized, can tolerate periods of dryness and full sun. It will be planted from EL 394 to EL 395.50. 4. Rice Cut Grass "Leersia Oryzoides" — Rice Cut Grass will tolerate inundation up to 3", has a high value as food and cover for wildlife and shore line stabilization. It will be planted from EL 395.50 to 396.00. All plants shall be planted to provide a 90% cover rated within 180 days of completion of pond. Plants not thriving at the end of this period shall be removed and replaced. ANA NC®ENR C CT 15 20n, North Carolina Department of Environment and Natural Resources Michael F. Easley, Governor William G. Ross Jr., Secretary October 1 1.2001 Gregory J. Thorpe, Ph.D. Acting Director Mr. Mike Gatti, Owner Division of Water Quality Carolina Court PO Box 602 Carthage; NC 29327 SUBJECT: APPLICATION No. SW6001 I Of Additional Information Request Carolina Court High Density (HQW) Stormwater Project Moore Countv, NC Dear Mr. Gatti: This office has completed a preliminary engineering review of the subject application. The following items must be addressed before we can complete our review: Please provide documentation that the Village of W nispering Pines has approved WS - f 1] High Densitythat cxcccds 50% imporvious area. 15A NCAC 0213.0215 (3)(b)(B) which states -`High Density- Option: If new development density exceeds the low density option requirement specified in Sub -Item (3)(b)(1)(A) of this Rule then development must control runoff from the first inch of rainfall; new residential and non-residential development shall not exceed 50 percent built -upon area," 15 NCAC 0213.0215 (3)(b)(G) requires a minitnum 100 foot vegetative buffer is required for all new development activity that exceed the low density requirement as specified in Sub -Item (3)(b)(I•)(A) and Sub -Item (3)(b)(11)(A) of this Rule, otherivise a miniaminn 30 foot vegetative buffer development is required along all perennial waters. 2. Please make all necessary rcgsio:ns and s!Abm.it an application that includes, original � signatures and initials. ��j,`.: `U" r ,'Ci ��-'•;i:1'' ��. 3. Page 2 of 4 III No. 5 of application indicates (1) drainage area but project has (3) drainage area's that must be broken down and shown under No. 6 of page 2 of 4. Please show drainage areas in acres or square Feet. 4. Forebay volume of wct detention basin supplement should be no more than 20% of the total - volti ne. :._ ! 5. Please verity SAIDA ratio numbers as provided. The SAIDa table 1. l as rercrenced in your application is based upon 85%TSS removal in the piedmont. A vegetative filter is required for 85% removal in coastal and piedmont counties. A vegetative filter is not required for 90% removal. Note 90% removal tables exist only for coastal plains soil types. Fayetteville Regional Office 225 Green Street - Suite 714, Fayetteville, North Carolina 28301-5043 Phone: 910-486-1541 1 FAX: 910.486-07071Intemel: ,Yw•w.cnr.state.nc.tis't;IVR An Equal Opportunity 1 Affirmafve Action Employer - 50% Recycled 110% Post Consumer Paper e Mr. Gatti Page - 2 October 11, 2001 r & Show calculations or method for the detention basins r_eg_rtire_ d, proyid_e_d, and teDporary. volumes. 7_ Check Page - I of supplement that indicates Orifice diameter to be 12 inches. 8. Maintenance agreement needed for 13iorctention systems. 9. All buildings must be included in appropriate drainage area. Note - All roof drwins must be noted on plans as draining to the appropriate system. 10. Delineate the Wetlands (provide a symbol in the legend) or note oil the plans that there are no wetlands on site. r 11. Aquatic vegetation must be included for a wetland type detention basin. A minimum ten foot wide shallow sloped shelf is needed at the edge of the basin for safety and to provide appropriate conditions for aquatic vegetation, This shelf should be sloped 6:1 or flatter and extend to a depth of 2 feet below the surface of the permanent pool. A list of suitable wetland species and propagation techniques are provided in Schucler (1987) and Niaryiand DNR (1987), 12. Provide per manent pool dimensions. 13. Include a detailed outlet structure with trash rack = <4" and screen of orifice in plans/spec t4. Specify vegetation (grass) oil 3:1 slopes (seed schedule) (SEC). If a modification, have you considered the ramifications of the changes? For examplc, changing a drainage area means revising the calculations, supplement form and application. Adding built -upon area rcquires the same rc..visions. Make sure all the documentation matches up with the new information. Please reference the project number above on all correspondences. If you have any questions, please tail me at (910) 486-1541. Sincerely, ej Ricky Revels Environmental Technician cc: Pat S. Willett, Hobbs. Upchurch & Assoc. Chris Parillo, Planning S,- Zoning Administrator - Whispering Pines, NC F'% ,isf:RS'u.3il-'W340', `%MRF%SWti001101 ALIKE (IM-11 CAROLINA COURT Bio Retention Maintenance Guidelines and Maintenance Agreement A schedule of recommended maintenance for bioretention areas is given in the attached table. The table gives general guidance regarding methods, frequency, and time of year for bioretention area maintenance. Planting Soil Urban plant communities tend to become very acidic due to precipitation as well as the influences of stormwater runoff. For this reason, it is recommended that the application of an alkaline substance, such as limestone, be performed once a year. Testing of the pH of the organic layer and soil should precede the limestone application to determine the amount of limestone required. Soil testing should be conducted annually so that the accumulation of toxins and heavy metals can be detected and/or prevented. Data suggest accumulation of toxins and heavy metal can be expected within 5 years of installation. As the toxic substances accumulate, the plant biological functions may become impaired, and the plant may experience dwarfed growth followed by morality. The biota within the soil can also perish and the natural soil chemistry may be altered. The preventative measures would include the removal of the contaminated soil. In some cases, removal and disposal of the entire soil base, as well as the plant material, may be required. This will be based on annual soil testing results and visual inspection of plantings. 2. Mulch Bioretention areas should be mulched once the planting of trees and shrubs has occurred. Any ground cover specified as plugs may be installed once the area has been mulched. Ground cover established by seeding and/or consisting of grass should not be covered with mulch. 3. Plant Materials An important aspect of landscape architecture is to design areas that require little maintenance. Certain plant species involve maintenance problems due to dropping of fruit or other portions of the plant. Another problem includes plants, primarily trees, that are susceptible to windthrow, which creates a potential hazard to people and property (parked cars). As a result, some plant species will be limited to use in low traffic areas. Ongoing monitoring and maintenance is vital to the overall success of bioretention areas. Annual maintenance will be required for plant material, mulch layer, and soil layer. The maintenance schedule will be followed to maintain the bioretention areas. Carolina Court Maintenance Schedule for Bioretention Areas Description Method Frequency Time of Year Soil Inspect and Repair Visual Monthly Monthly Erosion Organic Layer Remulch any void area By hand Whenever needed Whenever needed Remove previous mulch By hand Once every two or three Spring layer before applying years new layer (optional) Any additional mulch By hand Once a year Spring added Plants Remove and See planting Twice a year 3/15 to 4/30 and 10/1 to replacement of all dead specifications 1 1/30 and diseased vegetation considered beyond treatment Treat all diseased trees Mechanical or by hand NIA Varies, but will depend and shrubs on insect or disease infestation Watering plant material By hand Immediately after NIA shall take place at the completion of project end of each day for fourteen consecutive days and after planting has been completed Replacement of support By hand Once a year Only remove stakes in stakes the spring Replace any deficient By hand Whenever needed Whenever needed stakes or wires I acknowledge and agree by my signature below that I am responsible for the performance of the bioretention maintenance procedures for Carolina Court 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: --Aira4C-L- Title:-L�lslF1L - Address: 1z n4 Z14T—T� a'q-4 a - Phone: M - U77 Z�/-O _ Signature: IVG a_ Date: (C) - 3 1 c> I 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�� f , and acknowledge the due execution of the foregoing wet detention basin maintenance requirements. Witness my hand and official seal, ,'++���rrnrrrrr r z NpTA F�1� • ti 4. �r"+r,C dU• L My commission expires aw a 7 L. f SEED BED PREPARATION l . Rip the entire area to 6" depth. 2. Remove all loose rock, roots and other obstructions leaving surface reasonably smooth and uniform. 3. Apply agricultural lime, fertilizer, and superphosphate in accordance with "Seeding Schedule" and mix with soil. 4. Continue tillage until a well -pulverized, firm, reasonably uniform seedbed is prepared 4 to 6 inches deep. 5. Seed on a freshly prepared seedbed and cover seed lightly with seeding equipment or cultipack after seeding. Seed according to "Seeding Schedule." 6. Mulch in accordance with "Seeding Schedule" immediately after seeding. 7. Inspect all seeding for compliance with the requirements of the "Seeding Schedule". Make necessary repairs and reseed within the planting season, if possible, or the damaged area shall be reestablished following the original lime, fertilizer, and seeding requirements. SEEDING SCHEDULE Note Temporary seed mix shall be used for all areas exposed greater than on week and subject to further disturbance. Permanent seed mix shall be checked for adequacy on July 15. An adequate cover shall have 50 springs of Bermuda, Sericea Lespedeza or Bahiagrass per one square foot. Permanent Spring Seed Mix Mix 1 Dates March 1 — July Mix 2 Dates March 1 —July 1 Permanent Fall Seed Mix Mix 1 Dates July 15 — March 31 Species Rate (Lb./Acre) Pensacola Bahiagrass 60 Common Bermuda 25 German Millet 10 Species Rate Lb./Acre Pensacola Bahiagrass 60 Common Bermuda 25 Species * Common Bermuda Winter Rye (Grain) Kobe Lespedeza Pensacola Bahiagrass Rate Lb./Acre) 20 25 25 25 Mix 2 Dates Species * Rate (Lb./Acre) April 1 — July 15 Common Bermuda 30 Hulled Serica Lespedeza (Unscarified) 30 Kobe Lespedeza 25 German Millet 25 Pensacola Bahiagrass 50 * Within the drip line of all oak tress seed as follows: - in addition to the schedule seeding, plant 1" St. Augustine Plugs Raleigh Variety, on 12" centers. - In lieu of sodding, plant in accordance with the appropriate seeding schedule and plant 1" St. Augustine Plugs, Raleigh Variety, on 12" centers. Temporary Summer Seed Mix Dates March 1 — Sept. I Temporary Winter Seed Mix Dates Sept. 1 —March 1 (To be followed by permanent fall seed mix) S—pecies Rate (Lb./Acre) German Millet 120 Species Rate (Lb./Acre) Winter Rye (Grain) 200 Kobe Lespedeza 10 Soil Amendments To be incorporated into the top 3 inches of soil in areas with slopes 2A or flatter Apply fertilizer (10-10-10) at a rate of 1000 lb/acre Apply lime (Ground Agricultural Limestone) at a rate of 4000 lb/acre** Apply superphosphate (0-49-0) at a rate of 200 lblacre* * * * Required for permanent seed mix only - Mulch Apply 4,000 lb/acre grain straw or equivalent cover. Anchor mulch with roving, netting or by tacking with asphalt emulsion at a rate of 400 gal./acre. Water Minimum of 1" of rainfall a week (if not supplied naturally, constructor shall supply the remaining amount until ground cover has been established). Maintenance Refertilize in the second year unless the growth is fully adequate. Mow when the average plant height exceeds b inches. Reseed, fertilize and mulch damaged areas immediately. PROM :'Village of Whispering Pines PHONE NO. : 910 949 3907 Jul. 31 2001 09:54AM P2 VI11.[_111-,A )Ft', 01' �S1VHILS.PI RIPI \TG I N I E,'S) 10 PINE RIDGE DRIVE WTTISNtERTNG PINES, NOR'T 14 CAROLINA 28327 TELEPFiONB: (910) 949-3141 t-AX: (910) 949-3907 July 31, 2001 Ms_ Pat Willett Hobbs, Upchurch & Associates, P.,A, P, Q. Box 1737 So, Pines, NC 28388 Re_ Carolina Court Development Dear Pat, This is to acknowledge that as part of the approval by the Village Council for the above referenced development on NC Highway 22, it was understood that the percentage of impervious surface planned for the project stood at 32%. This was represented on the site plan submitted for final approval dated January 12, 2000. Final approval was granted September 14, 2000 and later amended on November 17, 2000. Copies of those approvals are attached for your information. If you have any further questions, please contact me. Sincerely, 'QL Chris Parillo Planning & Zoning Administrator att. FROM :'Village or LJhispering Pines PHONE NO. : 910 949 3907 Jul. 31 2001 09:55AM P3 Page 1 of 2 VILLAGE OF WHISPERING PINES Conditional Use Permit Approval On the date(s) listed below, the Couzzcil for the Village of Whispezing Pines met and held a public hearing to consider a request for a modification to a conditional provision for a conditional use permit approved by Council at its meeting on September 14, 2000. The provision in question is "2f 'contained in the approval (No building shall be occupied until Hwy 22 is widened per the ply") Applicant: Michael Gatti Property Location: NC Hwy 22, north of Sullivan Drive, south of Four Seasons Drive Proposed Use of Property: Shopping Center (Zoned NS) Meeting Date: November 9, 2000 Having heard all the evidence and argument presented at the hearing, the Council finds that the applicant should be relieved of the above cited condition (21:) based upon the following evidence submitted to Council at this public hearing: a. Letter from Fidelity Bank dated September 26, 2000 b. Memo from Michael Gatti (undated, received 10//2100 requesting relief from condition 2f. e. Letter from Department of Transportation dated October 25, 2000 to Mr. Gatti regarding driveway application_ As you testified, you now have full control of the responsibility for the widening of Hwy 22 and given so, the following conditions are established in addition to those outlined in the earlier approval with the exception of" 2f'_ a. 'Widening of Hwy 22 will be in accordance with the approval process by the DOT. b. No permit shall be issued for or construction begin on Phase 2 of the shopping center, as noted on the site plan, until the widening project is fully completed and approved by the DOT per the terms of their 10/25/00 letter. IN WITNESS WBEREOF, the Village has caused this permit to be modified as stipulated above FROM :'Village of Whispering Pines .i r , PHONE NO. : 910 949 3907 Jul. 31 2001 09:55RM P4 Page 2 of 2, Gatti and furthermore, the undersigned understands that all previous matters of record recorded on the approval dated September 20, 2000 shall remain in force. As the property owner of the property described, do hereby accept this Conditional Use Permit modification, together with all its conditions, as binding on me and any successors in interest. November 15, 20Q0' -Attest: eal) Village Clerk Village Council of Whispering Pines ByI Ij �� Witham ateman, Mayor -Tern owner(s) of the above identified property, do hereby acknowledge receipt of this modification to my Conditional, Use Permit. The undersigned owner(s) do further acknowledge that no work may be done pursuant to this permit except in accordance with all of its associated conditions and requirements and that this restriction shall be binding on me and any successors in interest. it -o +yv Date _, FROM :'Village of Whispering Pines PHONE NO. : 910 949 3907 Jul. 31 2001 09:56AM P5 Page 1 of 3 VILLAGE OF WHISPERING PINES Conditional Use Permit Approval On the date(s) listed below, the Council for the Village of Whispering pines met and held a public hearing to consider the following application_ Applicant: Mchael Grath Property Location: NC Hwy 22, north of Sullivan Drive, south of Four Seasons Drive Proposed Use of Property: Shopping Center (Zoned NS) Meeting Date: September 14, 2000 Having heard all the evidence and argument presented at the hearing, the Council finds that the application is complete, that the application complies with all of the applicable requirements of thy, - Whispering Pines Zoning Ordinance for the development proposed, and that therefore the application to make use of the above described property for the purpose indicated is hereby approved, subject to all applicable provisions of the Zoning Ordinance and the following conditions: (1) The applicant shall complete the development strictly in accordance with the plans subo-dued to and approved by this Council. Any deviation(s) or requests far changes to said plans must be approved by Council prior to such change(s) being made on site. Plans are on file at the Village Hall and consist of the following: a. Exhibit A Site Plan dated 1/12100, Revision 45, 8/17/00 b. Exhibit B Rendering, of Building Elevations - 3 pages c. Exhibit C- Rendering of Entry Signs & Building signs d_ Exhibit D-Letter from DOT dated 8/14/00 describing plans to widen Hwy 22 e. Exhibit E- Memo from DOT dated 3/21/00 re Driveway Review f. Exhibit F- Sample picture of parking area light fixture g. Exhibit G- Driveway Permit Applications to DOT FROM :'Village of Whispering pines PHONE NO. : 910 949 3907 Jul. 31 2001 09:56AM P6 Page 2 of 3 (2) If any of the conditions affixed hereto or any part thereof shall be held invalid or void, then this Conditional Use Permit shall be void and of no effect. a. An approved Erosion Control Plan must be received by the Village of Whispering Pines prior to any construction_ b- Height of light poles shall not exceed 15'- e. Exterior pole lights shall not exceed 250 watts- d. Signs shall have exterior lighting. e. All landscaping shall be n=iaged so as to maintain viable vegetation- f No building shall be occupied until Hwy 22 is widened per the plan 7N WITNESS WHEREOF, the Village has caused this permit to be issued in its name, and the undersigned, being all or the duly assigned agent of the property owners of the property above described, do hereby accept this Conditional Use Permit, together with all its conditions, as binding on them and their successors in interest - Village Council of Whispering Pines m- W-'wl ; I Atteit - Village Clerk owner(s) of the above identified property, do hereby acknowledge receipt of this Conditional Use Permit. The undersigned owner(s) do further acknowledge that no work may be done pursuant to this permit except in FROM :.Village of Whispering Pines PHONE NO. : 910 949 3907 Jul. 31 2001 09:57AM P7 Page 3 of 3 accordance with ail of its conditions and requirements and that this restriction sham be binding on them and their successors in interest. September 20, 2000 , FROM : Village of WhiSpe-ring PinaS PHONE NO. : 910 949 3907 Oct. 18 2001 02:25PM P1 VM,L-AGE OP WHISPERING PINES. 10 PINE RIDGE DRIVE WI-ITSPERING PINES, NORTH CARC)L,TNA 28327 TELEP1i0NE: (910) 949-3141 FAX: ()10) 949-3907 To: Ricky Revels - NCDEINR October 18, 2001 From: Gene Opdyke Subj.: Carolina Court Cc.: Pat Willett - Hobbs, Upchurch Confirming my telephoned information, the total land area of Carolina Court is 11.38 acres (495712.8 sq_ ft_)_ The total impervious area is 160003.34 sq. ft. Dividing 160003.34 by 495712.8 equals 0.322774 or 32.2774 percent. These numbers were taken directly from a drawing titled `"Carolina Court - Land Use Plan", Rev. 5, dated 8-17-00. The drawing was issued by Hobbs, Upchurch and Associates, and was sealed by David T_ Upchurch, P. E. I hope this is what you need. Gene Opdyke Carolina Court Narrative The Carolina Court site has a total of 11.38 acres in the tract. (See attached map prepared by Blue Land Water Infrastructure, P.A.) The storm water for Carolina Court will be managed by a wet detention basin and a series of two (2) bioretention areas. There is no off site drainage contributing to the development area storm water runoff. 4.57 acres of the 11.38 total acres will be developed. 3.67 acres of storm water runoff will be diverted to the wet detention basin. The southwest area of 0.67 Acres will sheet flow to 4,465.00 SF of Bioretention area at the southwest corner and paralleling NC Highway 22 right of way north approximately 215 linear feet. The southwest area of 1.20 Acres will sheet flow to 4,465.00 SF of Bioretention area at the west property line and NC Highway 22 right of way approximately 275 linear feet. The Bioretention areas will be planted with grasses, ground cover and landscaping. The north area consisting of 3 buildings will shut flow north to a filter strip and level spread prior to the existing pond on the site. (see attached specifications) a HOBBS, UPCHURCH & ASSOCIATES CONSULTING ENGINEERS P.O. 13OX 1737 300 SOUTH WEST BROAD STREET SOUTHERN PINES, NORTI I CAROLINA 28388 PHONE: 1-(910)-692-5616 FAX: 1-(9 l 0)-692-7342 To: NCD NR Fayetteville Regional Office 225 Green Strect-Suite 714 Fayetteville. N.C. 28301-5043 The Following ltem(s) : LETTER OFTRANSMITTAL RANSMITTAL Datefl -01 Job No. WP9906 Attu, Mr, Ricky Revels Ref.: Carolina Court Storm Water Management We are sending you Attached [� Under separate cover VIA Shop Drawings Prints OSamplcs 0 Specifications Cony of Letter Chance Order O Oreinial Mvlars Nov — 5 Copies Date Project No. Description 3 10/19/2001 WP9906 Letter from Village of Whispering Pines 3 10/23/2001 WP9906 Detention Basing Design & associated Calculations 3 WP9906 13ioretention Specifications & Seeding Schedule l 07130/1998 WP9906 Lot Survey for reference 1 10/11/2001 WE19906 NCDENR Letter for reference 3 10124/2DOI WP9906 Bioretcntion Manitenance agreement These are Transmitted as Checked Below : O For Approval O Approved as Submitted O For Your Use O Approved as Noted 0 As Requested © Returned for Corrections O For Rcvie%v and Comment O Remarks: Ricky, Resubmit for Approval O Submit for Distribution O Return Corrected Prints for recordation © Prints Returned After Loan to Us i think I've covered everything in the comments and have sent additional information. If you have any questions or need other information please call at your conviencc. Copy To: FILE Signed: Mr. Mike Gatti PAT S. WILLETT