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HomeMy WebLinkAboutSW8030720_HISTORICAL FILE_20031212STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 0 3 07 ZO DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE 2bv3 12IZ YYYYMMDD OF WArFR Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources r- j Alan W. Klimek, P.E.,Director .� Division of Water Quality Coleen H. Sullins, Deputy Director —_ ~^ Divisiomof Water Quality December 12, 2003 Commander B.D. Pina, CDRICECIUSN Marine Corps Base 1005 Michael Road Camp Lejeune, NC 28547 Subject: Stormwater Permit No. SW8 030720 Courthouse Bay Regional Pond N62470-02-13-3534 High Density Project Onslow County Dear Cdr. Pina: The Wilmington Regional Office received a complete Stormwater Management Permit Application for Courthouse Bay Regional Pond on December 8, 2003. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 030720 dated December 12, 2003, for the construction of the subject project. This permit shall be effective from the date of issuance until December 12, 2013, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in'this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150E of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer. 27447, Raleigh, NC 27611- 7447. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact Linda Lewis, or me at (910) 395-3900. Sincerely, Rick Shiver Water Quality Regional Supervisor RSSlarl: S:IWQSISTORMWATIPERMIT1030720.dec03 cc: Joe Avolis, P.E., Avolis Engineering Linda Lewis Wilmington Regional Office Central Files N. C. Division of Water Quality. 127 Cardinal Drive Extension (910) 395-3900 Customer Service Arta Wilmington Regional Office Wilmington, NC 28405 (910) 350-2004 Fax 1 800 623-7748 AMENfR State Storrnwater Management Syste Permit No. SW8 03072 MMo •; STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER -QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Commanding General, Camp Lejeune MCB Courthouse Bay Regional Pond Onslow County FOR THE construction, operation and maintenance of a wet detention pond in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit. This permit shall be effective from the date of issuance until December 12, 2013, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the. management of stormwater runoff as described on page 3 of this permit, the Project Data Sheet. The stormwater control has been designed to handle the runoff from 1,621,289 square feet of impervious area. This pond must be operated with a 30' vegetated filter. 3. 'The tract will be limited to the amount of built -upon area indicated on page 3 of '-- this permit, and per approved plans. The built -upon area for the future development is limited to 76,520 square feet. 4. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. A permit modification must be submitted and approved prior to the construction of additional built -upon area from outside of the approved drainage area. 2 of 8 State Stormwater Management Systems ' Permit No. SW8 030720 Mod, DIVISION OF WATER QUALITY PROJECT DESIGN DATA SHEET Project Name: Permit Number: Location: Applicant: Mailing Address: Application Date: Receiving Stream/River Basin: Stream Index Number.-. Classification of Water Body: Drainage Area, acres: Onsite, ft : Offsite, ft2: Total Impervious Surfaces, ft2: Existing: Proposed On -site: Offsite: Future: Pond Depth, feet: TSS removal efficiency: Permanent Pool Elevation, FMSL: Permitted Surface Area, ft2: Permitted Storage Volume, ft3: Courthouse Bay,,.Regional _Pond SW8 030720 Onslow County Cdr. B.D. Pina, CDR/CEC/USN Marine Corps Base 1005 Michael Road Camp Lejeune, NC 28547 December 8, 2003 New River 1 White Oak WOK02 19-(15.5) "SC NSW" 77.85 68.78 9.07 1,621,289 518,200 765,209 261,360 (from SW8 010431) 76,520 _ 4.0 85% (a 30' vegetated filter is required) 7.50 133,239@Permanent Pool 172,597 Temporary Storage Elevation, FMSL: 8.72 Controlling Orifice: 4 each @3"0 pipes (drawdown in 2-5 days) Permitted Forebay Volume, ft3: 106,582 3of8 State Stormwater Management Systems J Permit No. SW8 030720 Mod. ' 11. SCHEDULE OF COMPLIANCE The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior. to.the.gonstructi.on of any . built -upon surface. Z .. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation -and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of outlet structure, orifice device, flow spreader, catch basins and piping. g. Access to the outlet structure must be available at all times. 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken. 5. Decorative spray fountains will not be allowed in the stormwater treatment system. 6. The 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. A modification may be required for those deviations. 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. 9. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. If the proposed BUA exceeds the amount permitted under this permit, a modification to the permit must be submitted and approved prior to construction. 4of8 State Stormwater Management Systems Permit No. SW8 030720 Mod. 10. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 11. 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. 12. The permittee must maintain compliance with the proposed built -upon area and ensure that the runoff from all the built -upon is directed into the permitted system. 13. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the'permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum- requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. 14. The permittee must maintain the current permitted drainage area. No runoff from outside of the permitted drainage area boundary may enter the permitted stormwater facilities without first applying for and receiving a permit modification. III. GENERAL CONDITIONS This permit is not transferable to any person or entity except after notice to and approval by the Director. In the event of a change of ownership, or a name change, the permittee must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. 3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction. 5of8 State Stormwater Management Systems Permit No. SW8 030720 Mod. 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 system.,. 5. The permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permit -fed stormwater management facility. 6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 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. 8. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. Permit issued this the 12th day of December, 2003. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION y� Alan vv, KiimeK, i-'.C., uirecior V `"v " Division of Water Quality By Authority of the Environmental Management Commission 6of8 State Stormwater Management Systems Permit No. SW8 030720 Mod. Courthouse Bay Regional Pond Stormwater Permit No. SW8 030720 N62470-02-B-3534 Onslow County - Designer's Certification as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included -in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL 7of8 State Stormwater Management Systems Permit No. SW8 030720 Mod. Certification Requirements: 1. The drainage area to the system contains approximately the' 'ermitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The outlet/bypass structure elevations are per the approved plan. 6. The outlet structure is located per the approved plans. 7. Trash rack is provided on the outlet/bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short- circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. Required drawdown devices are correctly sized per the approved plans. —13. All required design depths are provided. 14. All required parts of the system are provided, such as a vegetated shelf, and a forebay. 15. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ regional Office 8 of 8 OFFICE USE ONLY Date Received Fee Paid Permit Number glad. t 13-1a3 ` 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 I. Applicants name (specify the name of the corporation, individual, etc. who owns the project): 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): B.D. Pina CDR/CEC/USN 3. Mailing Address for person listed in item 2 above: 1005 Michael Road City: C= Lei -uni- _ _ _^ State: NC Zip: 28547 Telephone Number: ( 910_ ) 451-595o EXT_ 203 4. Project Name (subdivision,.facility, or establishment name -should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): Regional Stor►nwater Pond, Courthouse Bay Marine Corps Base Camp Lejeune, NC 5. Location of Project (street address): Courthouse Bay Area (Marines Road) City: MCB Came Lejeune ; County: 6. Directions to project (from nearest major intersection): From NC 172 turn south into Courthouse Ekly., to Mleft on Third Street ,- Project is on the left 7. Latitude: N 342 _ Longitude:W 77° — 2171 A' of project 8. Contact person who can answer questions about the project: Name:_Joe Ayolis,__ P.E. - Telephone Number: ( 252 )633-0068 II. PERMIT INFORMATION: 1. Specify whether project is (check one) Form SWIJ-101 Version 3.99 New Page 1 of 4 Renewal Modification Dec 00 , 03 08: 5 1 a Kevin flvol is 252-633-6507 p.2 2. If this application is being submitted as the result of a renewal or modification to an existing per �nIt, list the existing permit number NSA and its issue date (if known) I 3. Specify the type of project (check one): Low Density X High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): _LAMA Major X Sedimentation/Erosion Control 404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. 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. Stormwater runoff will be treated in a wet detention POnd sized for 85% TSS_r_emoval. Pond discharr9e will flow over a level spreader an a vegetative filter strip. 2. Stormwater runoff from this project drains to the New River basin. 3. Total Project Area: 86.63 acres 4. Project Built Upon Area: 46.5 To 5. How many drainage areas does the project have? 1 6. Complete the following information for each drainage area. if there are more than two drainage areas In the project, attach an additional sheetwith the information for each area provided in the same format as below. Basin Infortnadon Drainage Area 1 Drainage Area 2 Receiving Stream Name New River Receiving Stream Class ,..,SC Drainage Area 3,391,103 sf Existing ImperviousArea 913,018 SF Proposed Impervious -Area 708,271 SF % Impervious' Area (total) 46.5 % Impervious' Surface Area Drainage Area 1 Drainage Area 2 On -site Buildings 330,820 SF On -site Streets 28,600 SF Ou-site Parking 307,711 SF On -site Sidewalks 41 IF 140 SF Other on -site 0 SF Off -site 0 SF TotaL- 708,271 SF Total: Impervious area is defaced as the built upon area including, but not iemitad m 6u&WWs, reads, parkhi6 areas, sidrwalks, gravel areas, etc Form SWU-101 Version 3.99 Page 2 of 4 7. How was the off -site impervious area listed above derived? Site inspection and ltopoc .raphic survey. 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 ds an attachment. L The following covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. 2. No more than NI� 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 e.wess of the permitted amount requires a state stormwater management permit modification prior to construction. 5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement forms) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and Ceneral 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 Farm SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-100 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of 4 VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original and one copy of the StOrmwater Management Permit Application Form • One copy of the applicable Supplement Form(s) for each BMP • Permit application processing fee of $420 (payable to NCDENR) • Detailed narrative description of Stormwater treatment/management • Two copies of plans and specifications, including:- - Development/Project name -'Engineer and firm -Legend - North arrow - Scale - Revision number & 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) VIL AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm):. Avolis Engineering, P.A. Mailing Address: P.O. Box 15564 City: NeState: UQ Zip: 28562 Phone: { 252 ) 6-11-0068 Fax: ( 252 ) 633-6507 VIA APPLICANT'S CERTIFICATION 1, (print or type name of person listed in General Inforination, item 2) B.D. Pinta, CDR/CEC/USN certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAC 2H .1000. Signature: tk`�- Date: 1 0' Form SWU-101 Version 3.99 Page 4 of 4 ' y r -WET DETENTION POND ANALYSIS FILE NAME: G:IDATAIWPDATAIWQSIPOND1030720Ultimate.WK1 PROJECT #: SW8 030720Ultimate REVIEWER: L. Lewis PROJECT NAME: Courthouse Bay Regional Pond DATE: 03-Dec-03 Receiving Stream: New River Class: SC NSW Drainage Basin: White Oak Index No. WOK02 19-(15.5) Site Area 86.63 acres Drainage Area 3,391,.1"0 QQ : square feet Area in AcrE 77.85 IMPERVIOUS AREAS Rational C Existing 518200.00 square feet 0.95 Proposed 765209.00 square feet 0.95 SW8 010431 261360.00 square feet 0.95 Reserve 76520.00 square feet 0.95 square feet square feet TOTAL 11X�212.8:,9.i0'; square feet Rational Cc= 0.61 SURFACE AREA CALCULATION % IMPERVIOUS 47.81% Des. Depth 4 TSS: 85 SA/DA Ratic 3.15% Req. SA 106708 sf Prov. SA 1'33239 sf VOLUME CALCULATION * place a "1" in the box if Rational is used Rational ?* 1 FOREBAY Des. Storm .,. Off,;;:; inches Perm. Pool Volume= 521674 Rv= 0.480 Req. Forebay Volume= 104334.8 Bottom 3.5 msl Provided Volume= 106582.00 Perm. Pool 7 SQ> msl Percent= Design Pool 8.72 msl Storage met @elev 8.72 msl Elevation Area Inc. Vol. Acc. Vol. Req. Volume �72a97. cf 8.00 139972.00 68303,00 68303.00 Vol. Prov. at DP ;:>;:a:7238{: cf 9.00 149152.00 144562.00 212865.00 ORIFICE CALCULATION COMMENTS Surface Area , Volume and Orifice are within Design Guidelines. 1 ■Dec 08 03 08:51a ■ �Ls December 8, 2003 Kevin Rvolis 252-633-6507 p.1 AVOLIS ENGINEERING, P.A. P.O. Box 15564 • New Bern, North Carolina 28561 - (252) 633-0068 Mrs. Linda Lewis Environmental Engineer N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 FAX (910) 350-2004 R1=;: 4S W 8030720, Regional Stormwater Pond, Courthouse Bay, MCB Camp Lejeune Dear Linde: In accordance with your email request of 12/5/03, attached please f id calculations for the 3-inch diameter orifice calculations and revised application pages (initialed at 1he changes). We appreciate your assistance with this project. Should you have any questions, please do not hesitate to give me a call. Sincerely, 4JOS96h volis. PE Dec 08- 03 08: 51 a Kevin Avolis 252-633-6507 p.3 � oak con��av�) tia��fl+° Permit No.uU (to be provided byDTVQ) 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 PEQ Storrnwater 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. 1. PROJECT MFORMA,TION Project Name: iRagimai gtnrrrwa= Pond, Courthouse _Say _ _ — Contact Person: Joe Ids, P. E. Phone Number: i 252 1 633-0068 For projects with multiple basins, specify which basin this worksheet applies to: NIA ._ elevations Basin Bottom Elevation 3.5 ft. Permanent Pool Elevation 7.5 ft. Temporary Pool Elevation 8.72 ft. (floor of the basin) (elevation of the orifice) (elevation of the discharge smrcture oreiflow) areas Permanent Pool Surface Areal 33. 239 �_ sq. ft. (water surface area at the orifice elevation) Drainage Area; �111 M3 -.7-7 8! __ ac. (on -sire and off -site drainage to the basin) Impervious Area V, 14-(P� _ 331. 22_ ac. (on -site and off -site drainage to the basin) volunres Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SAIDA I Diameter of Orifice Design Rainfall Design TSS Removal Z 521,674 cu_ ft (combined volume of maim basin and forebay) 17., q97 cu. fl (volume detained above the permanent pool) cu. ft. (approximately 20% of total volume) 3-06 (surface area to drainage area ratio from DWO table) in- (2 io 5 day temporary pool dirnr-down required 1 _ in- 85 ... % (minimum 8.i% required) Form SWU-102 Rev 3.99 Page 1 of 4 Footnotes: When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the actual imper%ious % 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 provide 90%TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal. 1(1. 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 L& _ _ a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). kk b. The forebay volume is approximately equal to 20% of the basin volume. c. The temporary pool controls runoff from the design storm event. d. The temporary pool drays down in 2 to 5 days. e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow cal cul ations) 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). _ _qC — _ i. Vegetative cover above the permanent pool elevation is specified. j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. 1. If the basin is used for sediment and erosion control during construction, clean out of the IF basin is specified prior to use as a wet detention basin. 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) R does 0 does not incorporate a vegetated filter at the outlet. This system (check one) 0 does Ocdoes not incorporate pretreatment other than a forebay. Form S WU-102 Rev 3.99 Page 2 of 4 Maintenance activities shall be performed as follows: 1. 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 3 feet in the main pond, the sediment shall be removed. '"'hen the permanent pool depth reads 3 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blcwrls) Permanent Pool Elevation 7. 5 Sediment Ren oral El, 4.5 _ ___`__ Sediment Removal Elevation 4.5 75% Bottoml 1e anon 3.5 %----------_..___--__-___..--------------.._----.. ----- Bottom Elevation 3.5 25% FOREBAY MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to ,grow along the vegetated shelf and forebay berm. 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. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible parry. Print name: B.D. Pina Title: CDR/CEC/USN Address: 1005 Michael Road Phone: (910)451-5950 Dit, 203 Signature: Date: i I b _ � / . d 3 _. Note: The legally responsible party should not be a homeo% ners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, Alice A. Bonnette a Notary Public for the State of North Carolina , County of Onslow do hereby certify thatr� f; A a personally appeared before me this day of O-Ai �voj and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, SEAL My commission expires o�?*, `� 6W-W, oZuO'r Form SWU-102 Rev 3.99 Page 4 of 4 WET DETENTION POND ANALYSIS FILE NAME: G:IDATAIWPDATAIWQSIPOND1030720Partial.WK1 PROJECT #: SW8 030720Partial REVIEWER: L. Lewis PROJECT NAME: Courthouse Bay Regional Pond DATE: 03-Dec-03 Receiving Stream: New River Class: SC NSW Drainage Basin: White Oak index No. WOK02 19-(15.5) Site Area 86.63 acres Drainage Area 270620 QO square feet Area in Acres 62.13 IMPERVIOUS AREAS Rational C Existing 518200.00 square feet 0.95 square feet 0.95 square feet 0.95 square feet 0.95 square feet square feet TOTAL 51i300 00 square feet Rational Cc= 0.42 SURFACE AREA CALCULATION % IMPERVIOUS 19,15% Des. Depth 4 TSS: 85 SAIDA Ratio 1.16% Req. SA 31322 sf Prov. SA :: >133239: sf VOLUME CALCULATION * place a "1" in the box if Rational is used Rational ?* 1 FOREBAY Des. Storm67m: ,piinches Perm. Pool Volume= 521674 Rv= 0.222 Req. Forebay Volume= 104334.8 Bottom 3.5 msl Provided Volume= 106582.00 Perm. Pool 7 5Q , msl Percent= ,.,....20¢lo; Design Pool 8.2 msl Storage met @elev 8.19 msl Elevation Area Inc. Vol. Acc. Vol. Req. Volume ff..0.57,24�1:i cf 8.00 139972.00 68303.00 68303.00 Vol. Prov. at DP � 7 .1 cf 9.00 149152,00 144562.00 212865.00 ORIFICE CALCULATION Avg. Head = 0.29 ft 02 Area = 30.90 sq. inches Flow Q2, cfs 0.554 cfs Q5 Area = 12.36 sq. inches Flow Q5, cfs 0.222 cfs Orifice Area 28.27 sq. inches No. of Orifices '<' Q= 0.507 cfs Diameter, inches. DA' weir H x W in x - in Drawdown = 1$6 days Surface Area @DP = 144519.286 sq. ft. Falling Head Drawdown = 2.8 days COMMENTS Surface Area , Volume and Orifice are within Design Guideline: TI - Q8 03 08:51a Kevin Avolis 252-633-6507 p-4 aV(Z�r t- A�f Mae CL� OAIA? I \;b—wkit i 'e.. I�Voi-15 Fk ?o'Bc)x K"C6,4- Ep) k- 0 (FAIA 411 'DSCEAkl8EKB Z00 ':"C A L t G- 0 RECEIVicili DEC 8 2003 PROJ # Clw roQ 30-420 Dec 08,03 08:51a Kevin Rvolis 252-633-6507 p.5 1.ZJ $jo3............ REGiWOV-, -<ibWM�ckaP �iou2t�IfSE a /'lCt3 CL 4 IS -rD ZuSTI1 r s� c orb OF EAU 3",o oP—,r-iass V6, A6 �ATEy) GI) lo(o25. fir• p• t} f Z3 0 � D�-i�l�� C.�C.�KG�T"ivr�s (�-(r� jo3� gSIZ-::�4 Fri 6Fogjc, CP9A)EA-V P Z� �uY�v� Kuatar� ;tauJ-T -raaaV = 1�Z►S�i- FT3 Af(.�Ir� , v' uR.E i-V-dwk 124 Z3 vf: 4 f ~-+103 C*LCULLA-VID" 0,trlp v rt o d Z STj)Q.A STpr6-Z— = 6. j 2- krT- u5� �)QIrter Ea.-). ib e � 14_ 3.1V Ut-(r-iCr--5 D ► 5C r•+ �c�G-F �� �, I.E. i. 3 \. o z l•Z 1.o4 1, 1 O. �I 1,0 0-,�5 0.1 O• 6�0 0• S 0, -4 o- o. n• 13 C". 5 o. la-, - (), 4 O. fr o 0,3 G. SZ o. 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C'�•J��Yt�� -1 ) ?-SaU tRZED 116LOMC- w SIDLs 1 vat.M M E kr +, ::7- L 'REP'�.ES rs 'FLOW FPoy Cb,"iBIA)Ep k(FT) Q �(a H�s� Q Ccu.Ar1 VoC, A01a 6(FT3) 0 4.56 — — 0. 5B o. 2 �S,SSZ k5�55'Z $0) il:7� 1Z. 0.4lo 0,(04 13► �Z4 Z0115Na (0(01 34$ VS 0.31 o.S� IzI52.$ 4l, U4 53, U10 ZA a- z-• o . 40� 1 of n + 5z 14$ a +31 Z36 30 0, Z0 o, 4 2 �, 0 TL (o i , 5(00 34, k (A- 3(a 0.13 0. 34 4,344 A fgo4 z(01 $Zo 4Z 0. o8 O•Z-- 593Z 341 -43( Zor q 65 48 0.04 n-lL� 41to4 `1$tg40 kbt 8164 54 0.12- 0.12 2r5 n, a l t ¢3 Z i , zg Z (00 O.IZ. 011L 2. 94,oZ4- tIr--T00 �b 0.0� 0.oz 0.0+ IrSIZ 81,u04 84(90 O , O-+ 0.040 j iZ°1 54>1SIaa &,::� 14- B4 0. 00 o, oa4- q5-0 Mj 610 &,Z 14- qp 0, 05 o. 034 -:�34 g0,24+ S,o 3v ►5 UlgTc Stu- j EMM 0.04' Gr q�TF►- a� '� use l��►Z �.QJJ. Si�GE C�UAt�� 1-��-� ..R J ,�La l �r'L�l.�� C� i' v i:.x��r �.:. I S Cw = L0:=:F((iC,J-r I: 6r1�r 3.o FuY- F(6P-E OvE-kFAU) L Celo(-Tt� 05- LA =tR � rY) Ti V, n�� lkh3� (wAk� S, L4 IU A '-VO t k� :V `�AZ OE tV.- LEA+ = 3" x 't EA = IZ" = t FT Dec 08 03 08:52a _t uala3....... Kevin Avolis 252-633-6507 p.7 R+ E��3�E� 5 fitlNlGN l�lokl H�}V� �1F�GT1�T/a+(% pn 14-A5 1' � `jam V*A VOLUME Per Gz FL-O a Af-OAt 4 - �3" o,�rG�C,�S Coml3irJEi� ED h Fr Crs 6 CHI G? Gu nrv� S I�oc Mari �'T3 9 6 1. 1 o,�eg Z1,3�4 2.113$4 Isl ,z(3 411 zs� 131, 341 RB O• `b2 n . a!a 1$, s��O 5�1, $3 2 ? 0.-+0 o•fok L01A u PrfTEZ Z4 ltufs,,THE Apm-riadkt, `RtAA)4,P75- Wt ttmE A5,56CI.A ED SLID F4Tl.� Z.�=w:�3 1%C�llA4nn�,, �kk4 1 �-i-fkf Sane s5p41.G i4r�i� E�jj 6 -- 'T�'� "�FULt. �JELz?E-D" �J-P,GO0 'WtLC. �T15FACit�fuq "DZhd9Do,) 1v 'THC 1V'*--xT 94 t�tuEs DF TNh5 Ll5i;�- 4 ;Em1 ' S ~vl&. o zk F teg5 STORMWAER MANAGEMENT NARRATIVE REGIONAL STORMWATER POND COURTHOUSE BAY AREA MARINE CORPS BASE CAMP LEJEUNE, NORTH CAROLINA THE PURPOSE OF THIS PROJECT IS TO PROVIDE A REGIONAL STORMWATER TREATMENT POND TO MEET THE COASTAL STORMWATER TREATMENT REQUIREMENTS FOR FUTURE MAJOR MILITARY CONSTRUCTION PROJECTS IN THE COURTHOUSE BAY AREA OF MARINE CORPS BASE CAMP LEJEUNE. THERE ARE CURRENTLY FIVE PLANNED MAJOR MILITARY CONSTRUCTION PROJECTS IN THE COURTHOUSE BAY AREA PRIMARILY IN SUPPORT OF THE EXPANDED COAST GUARD COMMAND FACILITIES. THESE PROJECTS WOULD ALL REQUIRE COASTAL STORMWATER TREATMENT SYSTEMS INDIVIDUALLY. THE PROPOSED SINGLE REGIONAL STORMWATER TREATMENT POND IS SIZED TO TREAT THE RUNOFF FROM ALL OF THE PROPOSED NEW CONSTRUCTION AREAS. SINCE THE NEW CONSTRUCTION PROJECTS ARE SEPARATE AND SOMEWHAT ISOLATED FROM ONE ANOTHER, THE STORMWATER RUNOFF FROM ALL OF THE EXISTING IMPERVIOUS AND PERVIOUS AREAS IN THE POND WATERSHEAD WILL BE CAPTURED AND TREATED AS WELL. A PORTION OF THE COURTHOUSE BAY BASE AREA DISCHARGES STORMWATER TO AREAS OF COURTHOUSE BAY THAT ARE CLASSIFIED SA HQW. THE MAJORITY OF THE NEW PROJECTS WHICH ARE PROPOSED DISCHARGE TO PORTIONS OF COURTHOUSE BAY THAT ARE NOW CLASSIFIED AS SC. THE PORTION OF THE COURTHOUSE BAY WATER BODY WHERE THE REGIONAL POND WOULD DISCHARGE IS IN THE SAME GENERAL AREAS WHERE T14E BASE'S WASTEWATER TREATMENT PLANT WAS DEMOLISHED. THE WASTEWATER TREATMENT PLNAT WAS DEMOLISHED AND REPLACED WITH A PUMP STATION WHICH PUMPS THE COURTHOUSE BAY AREA'S WASTEWATER TO CAMP LEJEUNE'S REGIONAL WASTEWATER TREATMENT PLANT NEAR FRENCH CREEK. TWO OTHER MAJOR MILITARY CONSTRUCTION PROJECTS, EACH BARRACKS FACILITIES, ARE CURRENTLY UNDER CONSTRUCTION AT COURTHOUSE BAY. EACH OF THESE PROJECTS WERE PREVIOUSLY PERMITTED FOR COASTAL STORMWATER DISCHARGE WITH INFILTRATION PONDS BEING THE PRIMARY STORMWATER TREATMENT DEVICES. THE PROPOSED REGIONAL STORMWATER TREATMENT POND IS BEING SIZED TO TREAT THIS RUNOFF IF IT EVER BECOMES NECESSARY. IN THE INTERIM, THE REGIONAL POND WOULD JUST FUNCTION AT A HIGHER REMOVAL EFFICIENCY THAN THE DESIGN 85%. THE BARRACK'S STORMWATER PONDS ARE INFILTRATION PONDS DUE TO DISCHARGE TO PORTIONS OF COURTHOUSE BAY WHICH ARE CLASSIFIED AS SA WATERS. THE PROPOSED REGIONAL STORM WATER TREATMENT DEVICE IS A WET DETENTION POND. THE POND IS DESIGNED FOR 85% TSS REMOVAL WITH A 4' DEEP PERMANENT POOL. THE POND WILL HAVE A LEVEL SPREADER. THE POND SURFACE AREA IS ALSO BEING INCREASED BY 10% TO ALLOW THE ADDITION OF ANY FUTURE PROJECTS OF ACCEPTABLE SIZE WITH THE APPROPRIATE STORMWATER PERMIT MODIFICATIONS. THE PROPOSED STORMWATER POND WILL DISCHARGE TO A TRIBUTARY OF A PORTION OF COURTHOUSE BAY CLASSIFIED AS SC. THE TRIBUTARY IS AN EXISTING MAJOR DRAINAGE OUTFALL FOR THE COURTHOUSE BAY AREA. STORMWATER TREATMENT WILL ALSO OCCUR IN THE MEANDERING WOODED TRIBUTARY PRIOR TO DISCHARGE TO COURTHOUSE BAY. THE POND WILL HAVE FOUR EACH 3" DIAMETER ORIFICES. THE ORIFICES WILL DRAW DOWN THE ONE -INCH DESIGN STORM FOR THE EXISTING DEVELOPED AREA ONLY AND ALSO THE EXISTING AREA WITH THE FUTURE DEVELOPMENT. THE DRAWDOWN OF BOTH OF THESE DEVELOPMENT SCENARIOS WILL OCCUR WITHIN A TWO TO FIVE DAY TIME INTERVAL. THE DESIGNED ORIFICES SIZES ARE SATISFACTORY FOR DEVELOPMENTCONDITIONS. Joe> Courthouse Bay Regional Pond Subject: Joe> Courthouse Bay Regional Pond From: Linda Lewis <Linda.Lewis@ncmail.net> Date: Wed, 03 Dec 2003 11:48:10 -0500 To: Joe & Kevin Avolis <avoliseng@always-online.com> Dear Joe: Please provide revised and sealed orifice calculations, indicating the choice.of 4 orifices, each 3" in diameter. I can accept a fax of the revised calculations. You decreased the impervious area on page 2 of the application to 1,621,289, to correspond to the calculations, but you also need to decrease the drainage area to 3,391,103, since this is what the pond design is based on. The Drainage Area and Impervious Area on the wet pond supplement also need to be changed to reflect the 37.22 acre BUA and 77.85 acre DA. I can accept a faxed copy of revised page 1 of the supplement and revised page 2 of the application. The permit has been drafted, and if the requested information is submitted by close of business Monday, December 8, 2003, the permit can be issued. Linda 1 of 1 12/3/2003 11.52 AM AVOLIS ENGINEERING, P.A. P.O. Box 15564 - New Bern, North Carolina 28561 • (252) 633-0068 October 9, 2003 Ms. Linda Lewis Environmental Engineer NC Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 RE: SW8 030720, Additional Information Courthouse Bay Regional Pond, Onslow County AE Project No. 02134 Dear Linda: RECEIVEID OCT 13 2003 DWQ pRoa # 5toSo3072U Enclosed please find three copies of both the applicable plan sheets and the application incorporating your comments of September 10, 2003. 1. The orifice size has been changed to 3" on sheet C2 and the application as requested. 2. The pond side slope and vegetated shelf wetland species have been specified on sheet C3. 3. The forebay berm has been raised to prevent the short circuiting of inflow at the southern forebay. 4. We have provided new signature pages with Commander Pina's signature. 5. The receiving watercourse name on the application has been changed from Courthouse Bay to the New River. 6. The application has been changed to report only 1,621,289 square feet of built - upon area. 7. The vegetated shelf has been deleted from the forebay areas in both the plan and cross-section views. 8. Vegetative seeding and a schedule tor planting the vegetative shelf has been added to sheet C3. 9. We have clarified the level spreader detail to show the higher side going toward the upstream rip rap apron. We appreciate your assistance with this project. Should you have any questions or need any additional information or assistance, please do not hesitate to call. Sincerely, OF WA7-, 4 Michael F. Easley, Governor p� William G. Ross Jr. Secretary 6 North Carolina Department of Environment and Natural kesources > Alan W. Klimek, P.E.,Director Division of Water Quality Coleen H. Sullins, Deputy Director Division of Water Quality September 10, 2003 Commander B.D. Pina, CDR, CEC, USN Commanding General MCB 1005 Michael Road Camp Lejeune, NC 28547 Subject: Request for Additional Information Stormwater Project No. SW8 030720 Courthouse Bay Regional Pond onslow County Dear Cdr. Pina: The Wilmington Regional Office received a Stormwater Management Permit Application for Courthouse Bay Regional Pond on July 21, 2003. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: 1. Please resize the orifice. The 3" diameter calculated for the orifice is based on the 2-day flowrate, which is the fastest the average flowrate can be. By bumping up the diameter to 3.5", the average flowrate increases such that the smaller volume is released in less than 2 days. The 3" diameter appears to work just fine for both volumes. 2. Please specify pond 1 swale side slope vegetation and the wetland species to be planted on the 6:1 shelf. 3. The pond will short-circuit the runoff coming into the forebay on the south side. Please provide a 3:1 LW flow path ratio in the pond from inlet to outlet by either aligning the pond differently, or raising this forebay berm height to 8.72, and providing a cut in the berm at the western end, farthest from the outlet, or providing baffles. 4. Tony Sholar has signed the application and supplement 0&M. The Commander has historically signed the stormwater applications for the Base. Please either sign the application and supplement yourself, or provide a signed letter, authorizing Mr. Sholar to sign on your behalf. 5. The entire Courthouse Bay is class SA waters. In order to allow the use of a wet pond, please amend page 2 of the application to correctly show the receiving stream as the New River, as indicated on the aerial photograph on Sheet C2 of the plans. N. C. Division of Water Quality 127 Cardinal Drive Extension (910) 395-3900 Customer service Wilmington Regional Office Wilmington, NC 28405 (910) 350-2004 Fax 1 800 623-7748 •;mod 14C DEN''R Cdr. Pina September 10, 2003 Stormwater Application No. SW8 030720 6. The application and calculations report 1,754,747 ft2 total built -upon area. This number is used to size the surface area, however, the calculations only use a maximum of 1,621,289 ft2 to determine the required storage volume and elevation. The overflow elevation is not set high enough to provide sufficient volume in the pond to store the runoff from 1,754,747 ft2 of built -upon area. Please either provide additional volume to store the runoff from 1,754,747. ft2 of built -upon area, or report only 1,621,289 ft2 on the application. 7. The vegetated shelf is supposed to go around the main pond. On the cross-section detail on sheet C4, the shelf (noted as a "safety ledge") is shown inside the forebay. Please revise. 8. Please provide seeding specifications or the vegetation plan, including the named wetlands species to be planted on the 6:1 shelf. 9. Please make it clear on the level spreader detail that the higher side goes toward the upstream rip -rap apron, and the lower side goes toward the downstream filter. Please note that this request for additional information is in response to a preliminary review. The requested information should be received by this Office prior to October 10, 2003, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143- 215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not - acceptable. If you have any questions concerning this matter please feel free to call me at (910) 395-3900. Sincerely, Linda Lewis Environmental Engineer RSS/ad: S:IWQSISTORMWATIADDINFO120031030720.sep03 cc: Joe Avolis, P.E. Tony Sholar Linda Lewis 2 I AVOLIS ENGINEERING, P.A. P.O. Box 15564 • New Bern, North Carolina 28561 • (252) 633-0068 July 18, 2003 Mrs. Linda Lewis Environmental Engineer NCDENR 127 Cardinal Drive Extension Wilmington, NC 28405-3845 RE: Regional Stormwater Pond Courthouse Bay Area Marine Corps Base Camp Lejeune, North Carolina Dear Linda: Enclosed please find our submittal for the above -referenced project consisting of following: • Stormwater Permit Application and Low Density Supplement (Original and One Copy) • Stormwater Narrative (Two Copies) • Applicable Plan Sheets (Two Copies) • $ 420 Application Fee The project provides stormwater treatment for several future Marine Corps Base Camp Lejeune projects and also provides stormwater treatment for a large surrounding area. The project is as we discussed during our May 15 meeting in you office. Your assistance with this project is appreciated. Should you have any questions or need additional information, please do not hesitate to call. Sincerely, volis, P.E. Pre d t ���v JUL 2 12003 r. a A VL iF • � C i LJJ !2 iF o F- {� cn CO { 0 z0 o nw m Ul G { n Q n 4 U n RECEIVEDSTORMWATER MANAGEMENT NARRATIVE 3UL 2 1 2003 REGIONAL STORMWATER POND COURTHOUSE BAY AREA DWQ MARINE CORPS BASE CAMP LEJEUNE, NC PROJ # THE PURPOSE OF THIS PROJECT IS TO PROVIDE A REGIONAL STORMWATER TREATMENT POND TO MEET THE COASTAL STORMWATER TREATMENT REQUIREMENTS FOR FUTURE MAJOR MILITARY CONSTRUCTION PROJECTS IN THE COURTHOUSE BAY AREA OF MARINE CORPS BASE CAMP LEJEUNE. THERE ARE CURRENTLY FIVE PLANNED MAJOR MILITARY CONSTRUCTION PROJECTS IN THE COURTHOUSE BAY AREA PRIMARILY IN SUPPORT OF THE EXPANDED COAST GUARD COMMAND FACILITIES. THESE PROJECTS WOULD OTHERWISE ALL REQUIRE COASTAL STORMWATER TREATMENT SYSTEMS INDIVIDUALLY. THE PROPOSED SINGLE REGIONAL STORMWATER TREATMENT POND IS SIZED TO TREAT THE RUNOFF FROM ALL OF THE PROPOSED NEW CONSTRUCTION AREAS. SINCE THE NEW CONSTRUCTION PROJECTS ARE SEPARATE AND SOMEWHAT ISOLATED FROM ONE ANOTHER, THE STORMWATER RUNOFF FROM ALL OF THE EXISTING IMPERVIOUS AND PERVIOUS AREAS IN THE POND WATERSHEAD WILL BE CAPTURED AND TREATED AS WELL. A PORTION OF THE COURTHOUSE BAY BASE AREA DISCHARGES STORMWATER TO AREAS OF COURTHOUSE BAY THAT ARE CLASSIFIED SA HQW. THE MAJORITY OF THE NEW PROJECTS WHICH ARE PROPOSED DISCHARGE TO PORTIONS OF COURTHOUSE BAY THAT ARE NOW CLASSIFIED AS SC. THE PORTION OF THE COURTHOUSE BAY WATER BODY WHERE THE REGIONAL POND WOULD DISCHARGE IS IN THE SAME GENERAL AREA WHERE THE BASE'S WASTEWATER TREATMENT PLANT WAS DEMOLISHED. THE WASTEWATER TREATMENT PLANT WAS DEMOLISHED AND REPLACED WITH A PUMP STATION WHICH PUMPS THE COURTHOUSE BAY AREA'S WASTEWATER TO CAMP LEJEUNE'S REGIONAL WASTEWATER TREATMENT PLANT NEAR FRENCH CREEK. TWO OTHER MAJOR MILITARY CONSTRUCTION PROJECTS, EACH BARRACKS FACILITIES, ARE CURRENTLY UNDER CONSTRUCTION AT COURTHOUSE BAY. EACH OF THESE PROTECTS WERE PREVIOUSLY PERMITTED FOR COASTAL STORMWATER DISCHARGE WITH INFILTRATION PONDS BEING THE PRIMARY STORMWATER TREATMENT DEVICES. THE PROPOSED REGIONAL STORMWATER TREATMENT POND IS BEING SIZED TO TREAT THIS RUNOFF IF IT EVER BECOMES NECESSARY. IN THE INTERIM, THE REGIONAL POND WOULD JUST FUNCTION AT A HIGHER REMOVAL EFFICIENCY THAN THE DESIGNED 85%. THE BARRACK'S STORMWATER PONDS ARE INFILTRATION PONDS DUE TO DISCHARGE TO PORTIONS OF COURTHOUSE BAY WHICH ARE CLASSIFIED AS SA WATERS. THE PROPOSED REGIONAL STORMWATER TREATMENT DEVICE IS A WET DETENTION POND. THE POND IS DESIGNED FOR 85% TSS REMOVAL WITH A 4' :- . DEEP PERMANENT POOL. THE POND WILL HAVE A LEVEL SPREADER. THE POND SURFACE AREA IS ALSO BEING INCREASED BY 10% TO ALLOW THE ADDITION OF ANY FUTURE PROJECTS OF ACCEPTABLE SIZE WITH THE FUTURE APPROPRIATE STORMWATER PERMIT MODIFICATIONS. THE PROPOSED STORMWATER POND WILL DISCHARGE TO A TRIBUTARY OF A PORTION OF COURTHOUSE BAY CLASSIFIED AS SC. THE TRIBUTARY IS AN EXISTING MAJOR DRAINAGE OUTFALL FOR THE COURTHOUSE BAY AREA. STORMWATER TREATMENT WILL ALSO OCCUR IN THIS MEANDERING WOODED TRIBUTARY PRIOR TO DISCHARGE TO COURTHOUSE BAY. THE POND WILL HAVE FOUR EACH 3 %" DIAMETER ORIFICES. THE ORIFICES WILL DRAW DOWN THE ONE INCH DESIGN STORM FOR THE EXISTING DEVELOPED AREA ONLY AND ALSO THE EXISTING AREA WITH THE FUTURE DEVELOPMENT. THE DRAW DOWN OF BOTH OF THESE DEVELOPMENT SCENARIOS WILL OCCUR WITHIN A TWO TO FIVE DAY TIME INTERVAL. THE DESIGNED ORIFICES SIZES ARE SATISFACTORY FOR DEVELOPMENT CONDITIONS. 1 1 1 1 1 ' STORMWATER AND EROSION AND SEDIMENTATION CONTROL CALCULATIONS COURTHOUSE BAY REGIONAL STORMWATER POND MARINE CORPS BASE ' CAMP LEJEUNE, NORTH CAROLINA RECEIVED JUL 2 1 2W3 DWQ PROJ # 1 Prepared by: Avolis Engineering, P.A. P.O. Box 15564 ' New Bern, NC 28561 (252)633-0068 Office 1 (252)633-6507 Fax ' July 17, 2003 1 1 1 1 1 1 1 1 � pv3 671`' STORMWATER AND EROSION AND SEDIMENTATION CONTROL CALCULATIONS COURTHOUSE BAY REGIONAL STORMWATER POND MARINE CORPS BASE CAMP LEJEUNE, NORTH CAROLINA Prepared by. Avolis Engineering, P.A. P.O. Box 15564 New Bern, NC 28561 (252)633-0068 Office (252)633-6507 Fax July 17, 2003 L-- STaL'r�lrnlA'�'E� 'cA.Geuc.gT1a�S Covt(�TtlthdSE � �z�' i4,J��.. �TORIMW��- Farfi t✓oth'�Tr}J�t.S> ��J r�e�Ac . Mpg WE Co rzps 9As E CAr+Mp C. f u S t7 rJ `its �ucZposE a TH�s PVX TSCT- IS 7P ?V-O V e AE q '?-FA 10 d A S`���ti1�Jgt-F T Ar�I�Eit}T PonlD TO M EST "Cliff COAS-7A L ST6wuW4*'-f, �RF�{TWI� rJ T FZE �► i1 R-F- M I�t S F6-9- iFt,ra 9.1:—f AAA 71 - +M 1 i_. +TAP y( co,Js u ►a�� PeoT>vers 1� � eausz-rHous . �4� &iz-F—A- o� r1�E pc�,JE� Mf�`aR r+n►t�ra�z�Cm�Sr�Crloa �i�aTG'a� Ir? Trite GDu�-THouS� BR� i-�i�A�1� I+J sup�a�T a T 1Nf F-KFAtiYvi�!r3 C-tA57 6 .A(AQD C,;bmA'Ar ]p Fgcl!-+T+ES. 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W (LL 1ZE5(5T 7)t-c f L) 4,+P— 5TgjeM 'e"j k,PE R%f RP►f Wt-ff4F- 57roeYAWATS�- oLnn;—r-r V eUi6iL FLU) .' , Finn s vwA DlSC, � r� 'T -� c�1rJ+•�� Di Tr, 4, Q n 55 G=5 CHAAME4 Wiortf = 2,L)O AT Tj15CrfA�E �u1Jr .51 % I� 3 '1 D&5,1GA) o(.A-rLp i pPg-�Jl)tK y.os I yr i34-e 5E4llrf2Dm I715p)-f = t• ! F4- VEc.uc+TJ = 2,1 -Ff/5 'D-Es+G a FIF 9A? 6j ---AAcTc Ljr- FbkcF- P-ccWDUP-6 T=ids T C 5 RFAR- STz.665 1/i l Y/ i� 1'I Ci = Fu,W PC T�4 , FT 5= C f44WA-:J L ;7+ 4 i>5 ►' ��a. o i, PcLwWABc, . �IkEA� �r�-E��S IS z.00 jbrrrZ F6P- 6" g\P iAf. U 5 E (0F l Q AT j o jo I AY} 1 M u ,r1 52,E Pp_ (An SIZ£ C R. Lf.0 •r, p,) j7i f +,) l l:'o E_ c r� T ,J C� OTra ? a r)v r" ^ '(»-r. Nmru s tv E, R jDS:Z , M V WS5 Ra" �p�D St�PE ��uGµ fit'+s DQR1r���E RDurE i� 0.3�°Id T� ,c.c,�...�,• A Dai,r� StA S�Wit I �AVDL15 rt4,4mz Ay PA AT U PS,-�EwA 5-ti D or- C u r, vu7- R5C4:-u v<S 4 t.,jw BAlZRAC r-s U.�, pe I i e ; 3_ CAS A&Y , V --76a G eM P 6� 3 %A(t. Ar-S = U M.a peuvacD A r' 3 C,FS r IAK (('�Sa C-Fm LA 1 I NEL,-) ME55 I au,%8A-eKa ' 2,%,000 sr Lac) L' = O.?S �$x5.4.)1hy-) (la, 7S Ac) - 2 -+.-5 cFs Tbi A-L- f:'u r ) = 2-4. 3 3 -F 3 = .3 3,5 C�5 ---------- r0,3A. 304, RCP Q •2Z. $ V-5 V = 4.-7- r4L, t'-111(011 ;Ecla Q = 3-:1-. 1 CFS 'V Y 57•3 F415 V-O& A 3&" Fce AC46s tMi-wes Ropfl.. 1 � - =AFr AT NE G)v'se-, OF :ZOr-VSr-�va s�u-r4 or- ' (Vue 'W NV 4 MA-ejJCs RohV) 174JhG� �C1E(� = ZC,SoOC) SF 5.2 Ac.) i CO. 4)(S,4 P jH2)(5 Z AY-) j1.2 Cr-s Rt:>fl -,v Q A-Gove- C �3.3 tt,z - 44•5- �5 •�s� 42" P-GP =n1� ET A7 jEhST SIDE. 0 ,= �r42 (.AbG UT A3TAcctJ�` PAf-A c vlf-,w-l> FQE q-4A-0) 'P90k E -fir= ZZS,S�� Sr = 5.2 A-c. I ' a pul = C A- (o. 3s) C 5,4 i d H P-)(5.2 A c) _ c1. 0 eFs 1 Q r4L _ �, s 44.5-= s4, 3 cr-5 i 42 ReP G4PAC% US u5c 4Z Re? 1 II 'FECi o,J PAL �lm I 1 1 11 I 2nNC-Er PcT q0°. CLAWS. t.') F OAD bli- �kQ [3LQ& 4 C--m5 r— -*t+40 b�DG (ldk-�EfZS p,rc4 -rigs (#0 if CW Tuz,,o p) Fob SAD) S-iZOES hlF-ti PCOAVWA� -M �,)C: HWJ l--2. J L^ (i) A_LF-A = S lac. C = 0.+ z- s4 1")1H� �j ciA = �o.4X5-4Xs)= 10,E crs qg" AcP GW,4C J rn)L�sT l+AL-r- wad WT (a We4Z. CGS Bow S A2,C F p-E5 c—r.)rcl L o CATOD POAV C-C 2, 05 Ac, �D,6)(S.4;4h4z.8sAr,)= 12.3 CFS �"rtDT+kL l�S. k2. 3 = -4-41 + efs sr�--:T R7- TES rrJ-rE���cr�aa 1co4 T:�•4= C(3.4 ChA,06,E F,i eE 5C.AFE T9 Us E 491' RC-F Vr T" P(r I-V" "N Germs; , D4 �oa� P2AO� A{,aA Soo 5SF 0- s 154C41s Ll oJAz- v �-AWAX FOP- = V�0, 000 sF + 19,906 5F= 299, Sao sr- = � r- s4 ralNe. �o CF5 I S i �In v( 5� �r RLlf DUZ. T ,1,OM . s illGUce� ;rpm, �oAD, 1 l 10 �IZ 0 rY� M � F-'Asr 0 rJ 7itf- L..I F-ST•f4W, S i 4ir.-- 0r- T)i4- vi -r Ra AcD. 7zAw- c - 0. S5 AC) &TOTAL = •q CF5 - 3l0• 2 CJ -5 i ()O-r1J-U5- tA)IT�-k 3(0 4 LtTLr-T 1 :'D�st�� R., � C� au-rcAET F�or1�cT►-a a �R- s,�cn.K ,�� Q� ". _RcP Q4ta = li(v C,I.:s 3 C AT Gdal) W iDT�+ A-r Fl?r- D15CKAt4E = MAC, '5T ViAME;TP. = r. s ct z� 1 �„ AftzorJ il�cic,��sS = l•s � d,N,�x = l.s � `�"_ Z� �, Voc �s E�GEa�� !k sE OAM --_-.. }�E�rv,Jkt, STn214/ VIES14 � ZJW P.•pc►° ounf—�T FuTr--e-rsw Foy 36" RGP FR)nA ii+E RIP RAP= 0', CYin41C = /, S -4-- 8 " -r I2-'r (,j++ fif Dr�cNA p�PE= 9