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SW8090517_COMPLIANCE_20110826
�'l STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE Zc 1 1 r?-, YYYYM M D D E NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Dee Freeman Governor Director Secretary August 26, 2011 Carl Baker, Deputy Public Works Officer USMCB Camp Lejeune Building 1005 Michael Road Camp Lejeune, NC 28547 Subject: State Stormwater Management Permit No. SW8 0905V Piney Green Gate Security Upgrade High Density Commercial Wet Detention Pond Project Onslow County Dear Mr. Baker: The Wilmington Regional Office received a complete Stormwater Management Permit Application for Piney Green Gate Security Upgrade on August 23, 2011. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000 and Session Law 2008-211. We are forwarding Permit No, SW8 090517 dated August 26, 2011, for the construction, operation and maintenance of the BMP's and built -upon areas associated with the subject project. This permit shall be effective from the date of issuance until August 31, 2019, 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 by filing a petition with the Office of Administrative Hearings (OAH), The petition must conform to Chapter 150E of the North Carolina General Statutes, and must be filed with the OAH within thirty (30) days of receipt of this permit. A petition is considered filed when it is received in the Office of Administrative Hearings during normal office hours. The OAH accepts filings Monday through Friday between the hours of 8:00 a,m. and 5:00 p.m., except for official state holidays. The petition may be filed by facsimile (fax) or electronic mail by an attached file (with restrictions) - provided the signed original, one (1) copy and a filing fee (if a filing fee is required by NCGS §150B-23.2) is received in the OAH within seven (7) business days following the faxed or electronic transmission. Unless such demands are made this permit shall be final and binding. You should contact the OAH with all questions regarding the filing fee and/or the details of the filing process. The mailing address, telephone and fax numbers for the Office of Administrative Hearings are: 6714 Mail Service Center, Raleigh, NC 27699-6714. Telephone 919-733-2698. FAX 919-733-3378. If you have any questions, or need additional information concerning this matter, please contact Chris Baker, at (910) 796-7215, Sincerely, �?or �Coleenctor Division of Water Quality GDS/ csb: &: WQS1StormwateAPermits & Projects120091090517 HDI2011 C% permit 090517 cc: Andrew Wilson, E. I., AECOM Technical Services Ins. Wilmington Regional Office Stormwater File Wilmington Regional Office One 127 Cardinal Drive Extension, Wilmington, North Carolina 28405 NorthCarofina Phone: 910-796-72151 FAX: 910-350-20041 Customer Service: 1-877-623-6748 r' tntemet: www,ncwaterqu��t��a ality.org +/aaa/�„ State Stormwater Management Systems Permit No. SW8 090517 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY COMMERCIAL 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 USMCB Camp Lejeune Piney Green Gate Security Upgrade Piney Green Road, Camp Lejeune, Onslow County FOR THE construction, operation and maintenance of a wet detention pond in compliance with the provisions of 15A NCAC 2H .1000 and Session Law 2008-211 (hereafter collectively referred to as the "stormwaterrules') 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 August 31, 2019, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.7 on page 3 of this permit. The stormwater control has been designed to handle the runoff from 233,182 square feet of impervious area. 3. A 50' wide vegetative buffer must be provided adjacent surface waters, measured horizontally from and perpendicular to the normal pool of impounded structures, the top of bank of both sides of streams and rivers and the mean high water line of tidal waters. 4. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans. 5. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. 6. The runoff from all built -upon area within the permitted drainage area(s) of this project must be directed into the permitted stormwater control system. Page 2of7 State Stormwater Management Systems Permit No. SW8 090517 7 The following design criteria have been provided in the wet detention pond and must be maintained at design condition: a. Drainage Area, ?ores: Onsite, ft : Offsite, ft2: b. Total Impervious Surfaces, ft2: Onsite, ft : Offsite, ft2: C. Design Storm, inches: d. Average Pond Design Depth, feet: e. TSS removal efficiency: f. Permanent Pool Elevation, FMS[ : g. Permanent Pool Surface Areg, ft h. Permitted Storage Volume, ft : i. Temporary Storage Elevation, FMSL: j. Pre-dev. 1 yr-24 hr. discharge rate, cfs k. Controlling Orifice: I. Orifice flowrate, cfs: M. Permitted Forebay Volume, ft3: n. Fountain Horsepower o. Receiving Stream/River Basin: P. Stream Index Number: q. Classification of Water Body: II. SCHEDULE OF COMPLIANCE 10.91 475,368 NIA 233,182 233,182 NIA 1.5 4.5 90 32.5 18,750 45,104 34.5 4.49 2"0 pipe 0.08 17,371 1/3 Wallace Creek 1 White Oak 19-20 "SB;NSW" 1. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 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 signed and approves! Operation and Maintenance Agreement 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. Mowin.9 and re -vegetation 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. The facilities shall be constructed as shown on the approved plans. This permit shall become void unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. Page 3 of 7 State Stormwater Management Systems Permit No. SW8 090517 6. Decorative spray fountains will be allowed in the stormwater treatment system, subject to the following criteria: a. The fountain must draw its water from less than 2' below the permanent pool su rface. b. Separated units, where the nozzle, pump and intake are connected by tubing, may be used only if they draw water from the surface in the deepest part of the pond. c. The falling water from the fountain must be centered in the pond, away from the shoreline. d. The maximum horsepower for a fountain in this pond is 1/3 horsepower. 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. Access to the stormwater facilities for inspection and maintenance shall be maintained via appropriate recorded easements at all times. 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. Redesign or addition to the approved amount of built -upon area or to the drainage area. C. Further development, subdivision, acquisition, lease or sale of any, all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. d. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 11. Prior to the construction of any permitted future areas shown on the approved plans, the permittee shall submit final site layout and grading plans to the Division for approval. 12. 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. 13. Approved plans and specifications for this project are incorporated by reference and 'ire enforceable parts of the permit. A copy of the approved plans and specifications shall be maintained on file by the Permittee at all times. Page 4 of 7 State Stormwater Management Systems Permit No. SW8 090517 III. GENERAL CONDITIONS This permit is not transferable to any person or entity except after notice to and approval by the Director. At least 30 days prior to a change of ownership, or a name change of the permittee or of the project, or a mailing address change, the permittee must submit a completed and signed Name/Ownership Change Form to the Division of Water Quality, accompanied by the supporting documentation as listed on the form. The approval of this request will be considered on its merits and may or may not be approved. 2. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. Neither the sale of the project in whole or in part, nor the conveyance of common area to a third party constitutes an approved transfer of the stormwater permit. 3. 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. 4. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 5. In the event that the facilities fail to perform satisfactorily, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 6. The permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 7. The permit remains in force and effect until modified, revoked, terminated or renewed. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and re -issuance or termination does not stay any permit condition. 8. 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. 9. The permittee shall submit a permit renewal request at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate documentation and the processing fee. Permit reissued this the 26th day of August, 2011. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION []ivision of Water Quality By Authority of the Environmental Management Commission Page 5 of 7 State Stormwater Management Systems Permit No. SW8 090517 Piney Green Gate Security Upgrade Stormwater Permit No. SW8 090517 Onslow Count Designer's Certification 1, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (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 specifications: Signature Registration Number Date SEAL Page 6 of 7 State Stormwater Management Systems Permit No. SW8 090517 Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The outlet 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 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 and located 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. 16. All components of the stormwater BMP are located in either recorded common areas, or recorded easements. cc: NCDENR-DWQ Regional Office Page 7 of 7 Calculation of Required Treatment Volume for New Impervious Area Piney Green Gate Security Upgrades - Stormwater Pond New Drainge Area (Sp 475368 New Imp Area (sf) 233182 (A) New Drainage Area (Ac) 10.9129477 {I) New Imp Fraction 0.49 (Rc)Rainfall Depth Per State SWP(in) 1.5 Designed By: ABW Date: 7122r2011 Step 1: Determine Runoff Volume From New Drainage Areallmpervious Areas Simple Method a. Rv =. 05 + .9(I,I )= Rv (post) = .05,.9'.4 = 0.49 Rv (pre) = 0.05 b v=3630xR„xR,,xt1 Post V=3630'3,T0.66'.4237 V (past)= 29204 of [Required Treatment Vol for Additional Drainage ArealIm ervious Areas (Post • Pre): 29204 cf Step 2: Determine Minimum Surface Area of Permanent Pool SAIDA from 10.2 = 3.82 0.0382 b. Min SA of Perm Pool a SAIDA' DA Min SA = 18159 sf Minimum Required Surface Area of Permanent Pool 18159 sf 1 ECEI V ED AUG 2 3 2011 BY: Piney Green Gate Security Improvements — MCB Camp Lejeune Stormwater Computations 15-Aug-11 Drawdown Calculations Q = CDA(2gHo)"' Cp= 0.60 A = 0.02 G = 32.2 ft/secz Ho = 0.67' (34.5'-32.5')/3 Q = 0.60*0.02 (2*32.2*0.67)112 Q = 0.08 cfs Drawdown Time T = Vreq / Q T = 2-9,204 / 0.08 T = 365,050 seconds T = 4.22 days AUG 2.1 2011 Stormwater Management Plan (Modification of Permit #SW8 090517) Prepared For: MCB Camp Lejeune USMCB Camp Lejeune — Piney Green Gate Security Upgrade Date: 08-22-11 SEAL I- - 035724 - C I��''•0,YAIy+M�OegfjwO�,,.``� AECOM 701 Corporate Center Dr., Suite 475 Raleigh, NC 27607 919-854-6200 Prepared By: Andrew Wilson, EIT Checked By: Bryan M. Dick, PE, PH Proiect Description This document is to serve as a modification to an existing permit (SW8 090517) for the MCB Camp Lejeune — Piney Green Gate Security Upgrade Project. The existing permitted boundary is split up into two drainage areas, drainage area #1 utilizes a wet detention basin that treats and controls the runoff generated from the impervious surfaces and the second drainage area #2 is untreated. This "mod" is a result of a road widening which slightly increases the impervious surfaces and total drainage area of drainage area #1. The runoff generated from the additional impervious surfaces will be treated by the existing permitted wet detention pond. Contact Information AECOM Technical Services Inc. Attn: Bryan M. Dick, PE, PH 701 Corporate Center Dr., Suite 475 Raleigh, NC 27607 Telephone: 919-854-6252 Fax: 919-854-6259 Identify Proiect Involvement The proposed project is located in the White Oak River Basin. The project drains to Wallace Creek (NCDWQ Index Number 19-20), which has an NCDWQ Stream Classification of SB, NSW. The Modification will result in the increase in drainage area #1 of approximately 13,504 sf with an increase in BUA of approximately 23,953 sf. The additional stormwater runoff generated from this increased BUA will meet the requirements of retaining the runoff volume from the 1.5 inch rainfall event per the requirements by the state as referenced from the DWQ Stormwater Manual. The additional stormwater will be treated via extra capacity provided in the existing permitted stormwater wet detention basin, Permit Number: SW8 090517. Runoff will be captured via grassed swales which will be routed to the existing stormwater pond. This project is not located within '/ miles of SA waters, or 575 feet of ORW waters. Stormwater Design Parameters The existing stormwater pond was designed in accordance with the state stormwater regulations in 2010. The wet basins under the existing stormwater permit will not be redesigned since there is enough extra capacity provided to treat the proposed increase in BUA. AUG 2 3 2011 Discussion of Treatment Measures The existing permitted treatment utilizes the existing permitted stormwater pond to treat the required 1.5 inch design storm and meet the TSS and Peak Flow requirements set forth by DWQ. This modification is addressing the adjustments associated with the increase of drainage area #1 and the increase in impervious area that will be treated by the existing stormwater pond, specifically, to insure that the existing stormwater pond has enough additional capacity to account for the additional runoff from these increases. According to Stormwater Permit Number SW8 090517, the wet detention basin has enough additional permitted capacity to treat the 1.5 inch rainfall depth runoff volume for the increases in drainage area #1. See table below for a breakdown of volumes and capacity: Permitted Proposed Required Provided Additional Additional Required Volume Volume Capacity Volume cubic feet cubic feet cubic feet cubic feet 27820 45104 17284 2779 Table 1. Summary of Permitted Vs Additional Required Volume for Stormwater Ponds Conclusion This Stormwater Management Plan represents an environmentally sensitive and effective plan for utilizing the proposed stormwater treatments to accommodate the increased runoff of the proposed site development. CEIVED AUG 21 2011 3Y: Camp Lejeune main Gate Piney Gr( ZM 17 -WSTER BOULEVARD BRE 01 CUTLER STREET BIRCH 13)RCH ~TO Camp Lejeune South Gate N ' �Mlle" ASCOM RECEIV PROJECT SITE Vicinity Map Piney Green Gate Security Upgrades Camp LejounoN1CB Ono|owCounty, NC SnNn I, USDA-NRC ils Data Man l Ihdatamallnrc� 15da QM"I ad ' ne and. 00 cem slopes ` ' - al day.loam e 15 Per , SltlgBs Ra - 1 i •°'�' Oil NoAL; Vando llna sans ! r l �} Gpg , FoA 4 WO� ,-� Project Area 4 ' BaB WO 1 tiMaCj * ! /J W ��O(� -S\),) b K� NCDENR 0::�osl'� North Carolina Department of Environment and Natural Resources Request for Express Permit Review . �t 6 r`�V_i *+)Cq For DENR Use ONLY Reviewer C. ►I Submit: tJ� •.h L ' , Time: confirm: FILL-IN all the information below and CHECK the Permit(s) you are requesting for express review. FAX or Email the completed form to Express Coordinator along with a completed DETAILED narrative site plan i file) and vicinitXfflaplsame items expected in the application package of the project location. Please include this form in the application package. • Asheville Region -Alison Davidson 828-296-4698;alison.davidson@ncmail.net • Fayetteville or Raleigh Region -David Lee 919-791.4203; david.leeOncmail.net • Mooresville & -Patrick Grogan 704-663-3772 or patrick.grogan(g)ncmail.net • Washington Region -Lyn Hardison 252-946-9215 or lyn.hardison@ncmail.net • Wilmington Region -Janet Russell 910-350-2004 or 1anet.russel0mcmail.net (VOTE. Project application received after 12 noon will be stamped in the following work day. Enter Related SW Permits of request SW Sw Sw SW SW RpV6,4,vt Project Name: PINEY GREEN GATE SECURITY UPGRADES County: ONSLOW Applicant: COMMANDING OFFICER MARINE CORPS BASE Company: CAMP LEGEUNE, NC Address: 1005 MICHAEL ROAD Cit): CAMP LEGEUNE, State: NC Zip: 28547-_ Phone: 910-451-5950, Fax: __ Email: @ Physical Location:MCB CAMP LEJEUNE Project Drains into SEE ATTACHMENT waters — Water classification see attachment (for classification see- http:llh2o.enr.state.nc-usibims/reportslrepoMsWB.htmi) Project Located in WHITE OAK River Basin. Is project draining to class ORW waters? N , within '/2 mile and draining -to class•SA-waters-Nor�within 1 mile and draining to class HQW waters? INL �CEI �V ED Engineer/Consultant: BRYAN M. DICK Pi Company: AECOM JUL z01� Address: 701 CORPORATE CENTER DRIVE SUITE 475 City: RALEIGH, State: NC Zip: 27607-_ Phone: 919.854-6200, Fax: 919-854- 2�59, Email: br av n.dick aecom.cam SECTION ONE: REQUESTING A SCOPING MEETING ONLY BY: ❑ Scoping Meeting ONLY ❑ DWQ, ❑ DCM, ❑ DLR, ❑ OTHER: SECTION TWO: CHECK ONLY THE PROGRAM (S) YOU ARE REQUESTING FOR EXPRESS PERMITTING ❑ 401 Unit ❑ Stream Origin Determination: _ # of stream calls — Please attach TOPO map marking the areas in questions ❑ Intermittent/Perennial Determination: T # of stream calls — Please attach TOPO map marking the areas in questions ❑ 401 Water Quality Certification ❑ Isolated Wetland (linear ft or acres) ❑ Riparian Buffer Authorization ❑ Minor Variance ❑ Major General Variance ® State Stormwater ❑ General ❑ SFR, ❑ SFR < 1 ac. ❑Bkhd & Bt Rni ,❑ Clear & Grub, ❑ Utility ❑ Other ❑ Low Density ❑ Low Density -Curb & Gutter -_,—# Curb Outlet Swales ❑ Off -site [SW (Provide permit #)j ® High Density -Detention Pond I # Treatment Systems ❑ High Density -Infiltration _ #Treatment Systems ❑ High Density -Bio-Retention _ # Treatment Systems ElHigh Density —SW Wetlands _ # Treatment Systems ❑ High Density -Other _ # Treatment Systems /® MOD:® Major ❑ Minor ❑ Plan Revision ❑ Redev, Exclusion SW 8090517 (provide permit#) ❑ Coastal Management ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront ❑ Land Quality ❑ Erosion and Sedimentation Control Plan with _ acres to be disturbed,(CK # (for DENR use)) SECTION THREE — PLEASE CHECK ALL THAT IS APPLICABLE TO YOUR PROJECT (for both scooinq and express meetina reauest Wetlands on Site ® Yes ❑ No Buffer Impacts: ® No ❑ YES: _acre(s) Wetlands Delineation has been completed: ® Yes ❑ No Isolated welland on Property ❑ Yes ® No US ACOE Approval of Delineation completed: ❑ Yes ® No 404 Application in Process w/ US ACOE: ❑ Yes ❑ No Permit Received from US ACOE ❑ Yes ® No .++*++*+**+**+++++s++++ssssssss*ss***+ss+ss+++**++.+""For DFNR use only"'**"s*+*++*+ss*+sss*+**+*ss+++*++*++++*++**+*:+s*+.+++*++• Fees lit for multi to ermits: Check# Total Fee Amount $ SUBMITTAL DATES Fee SUBMITTAL DATES Fee CAMA $ Variance (❑ illlaj; ❑ Min) $ SW (❑ HD, ❑ LD, [:1 Gen) $ 401: 1 $ LQS $ Stream Deter,_ $ NCDENR EXPRESS March 2009 . C. oa �o z � w-- QW W i O� 0. !1 W� �z N d z� �o �o a A� U I . i o o° G.. z ao xw — �z �o 0 x w �I U x xO Q Q Q p Q Q U � LTJ Stormwater Management Plan (Modification of Permit #SW8 090517) Prepared For: MCB Camp Lejeune USMCB Camp Lejeune — Piney Green Gate Security Upgrade Date: 06-24-11 AECOM 701 Corporate Center Dr., Suite 475 Raleigh, NC 27607 919-854-6200 Prepared By: Andrew Wilson, EIT Checked By: Bryan M. Dick, PE, PH REC�`.? VED JUL 0 1 2011 V•1 Q rl y I O O l� VJ L W v� - 0 z � w F� z w L4 w w .a w � u V � o U � U pit a z N O CA Project Description This document is to serve as a modification to an existing permit (SW8 090517) for the MCB Camp Lejeune — Piney Green Gate Security Upgrade Project. The existing permitted boundary is split up into two drainage areas, drainage area #1 utilizes a wet detention basin that treats and controls the runoff generated from the impervious surfaces and the second drainage area #2 is untreated: This "mod" is a result of a road widening which slightly increases the impervious surfaces and total drainage area of drainage area #1. The runoff generated from the additional impervious surfaces will be treated by the existing permitted wet detention pond. Contact Information AECOM Technical Services Inc. Attn: Bryan M. Dick, PE, PH 701 Corporate Center Dr., Suite 475 Raleigh, NC 27607 Telephone: 919-854-6252 Fax: 919-854-6259 Identify Project Involvement The proposed project is located in the White Oak River Basin. The project drains to Wallace Creek (NCDWQ Index Number 19-20), which has an NCDWQ Stream Classification of SB, NSW. The Modification will result in the increase in drainage area #1 of approximately 13,504 sf with an increase in BUA of approximately 23,953 sf. The additional stormwater runoff generated from this increased BUA will meet the requirements of retaining the runoff volume from the 1.5 inch rainfall event per the requirements by the state as referenced from the DWQ Stormwater Manual. The additional stormwater will be treated via extra capacity provided in the existing permitted stormwater wet detention basin, Permit Number: SW8 090517. Runoff will be captured via grassed swales which will be routed to the existing stormwater pond. This project is not located within '/z miles of SA waters, or 575 feet of ORW waters. Stormwater Design Parameters The existing stormwater pond was designed in accordance with the state stormwater regulations in 2010. The wet basins under the existing stormwater permit will not be redesigned since there is enough extra capacity provided to treat the proposed increase in BUA. �ECEIVED JUL 0 1 i011 BY: z w 0 zo o �o V � p a wx �o x c.. z �w a a _ z w w w � J U l POI > U F^ ca � V t4 O L V Discussion of Treatment Measures The existing permitted treatment utilizes the existing permitted stormwater pond to treat the required 1.5 inch design storm and meet the TSS and Peak Flow requirements set forth by DWQ. This modification is addressing the adjustments associated with the increase of drainage area #1 and the increase in impervious area that will be treated by the existing stormwater .pond, specifically, to insure that the existing stormwater pond has enough additional capacity to account for the additional runoff from these increases. According to Stormwater Permit Number SW8 090517, the wet detention basin has enough additional permitted capacity to treat the 1.5 inch rainfall depth runoff volume for the increases in drainage area #1. See table below for a breakdown of volumes and capacity: Permitted Proposed Required Provided Additional Required Volume Volume Capacity Volume cubic feet cubic feet cubic feet cubic feet 27820 45104 17284 2779 Table 1. Summary of Permitted Vs Additional Required Volume for Stormwater Ponds Conclusion This Stormwater Management Plan represents an environmentally sensitive and effective plan for utilizing the proposed stormwater treatments to accommodate the increased runoff of the proposed site development. RE,CEIVED JUL 0 1 2011 BY: dH Z 4 � Q Z V �o OA a �0 C � �o q O x 0 z s w o z t U x d O W F., y a Q Q Q Q Q q q Uo A I Camp Lejeune Main Gate y, 4 Jacksonville t•. .ti�j 11 I . o Ag r T t! f F,pP� BREWS B� Piney G 11 O n I O b O I1 3 t` `IN . � rn a s! •_ � � �O 1, I LLI IZ A I � Camp'Lejeune MC Base < l� --t \, ::ET '.> ♦IS yG BlRCN.; BIRCH t.t- I 1 crt .�` S 5��� . rid GP "T I��"' �'`.��`��• t l --- nnr-yUGif 80[ICEV,gRD��yy� Camp Lejeune South Gate sT,P r I �r•�F.f f. 70 �y Hofmann State Fo 1. 25 �� f Game Land 'Ca IBC Base; ` Shelter Ga and SP r" - t •�� t• j r A f ,��� i! ,,% -YA-, Project Location +- t 14 \ tL PROJECT SiTE'� Legend N Vicinity Map PAVED _ ------ UNPAVED A�COM Piney Green Gate Security Upgrades Camp Lejeune MCB 0 0.5 , 2 ZECE VED Onslow County, NC tiSiles �H H QQ w I 0 o° as �c o �a �a �a m� a 7 O x w - � H x w 00, � Or o r � o r� w s w :4 r ` OROUNDW�R PLuM � r r GROUNDWATER _ t! PLUME l ~ } �O WETLANDS Am ✓1 /�/ �Gp1" , BEGIN NEW CONSTRUCTION •1.2• STA.209+40.00 (PINEY OR Q �,•l2• STA.206+p0.00 jPINEY GREEN ROAD) L• STA.. 19+24.2 '19NES ROAD) FERRY •Y9• STA.\ 24.28 ISN\ FERRY ROAOE a 'CERCLASITE SNEADSTEERRY ROAD UXO SITE \ \ / r y.,ajn�alw rie Tro.oV Irl � u sn-nvYpL � i,+ � 1� � Y x,A Ii+t VAC 19 CCPP1,2i CPI 2 j ,0 INS GREEN'ROAD NEW. XIT LANES CIVIL. PAVING L GENE (•L MEP-) C E SLOPE SLAKE LINE A=COM +7 c f ----CDEAGTESCUT k±`C F DENOTES FY.L V. p] _ - SVPERELE AT" CENTEKWE / � OR/i1LtAGE 9TRVCTVRE 6 nPE �� O6 pWVMGE STRVCTVREY '_�� WETLANDS � E ® DENOTESSMETaEVNpfEB i�i� y i r PAVEMCNT REMOVAL 6Ya Z w LANDFILL BOUNDARY b w PAVEMENT RFRAIR i yy W CONCRETE PAVINGGKE�A- 1 a O P MEWALK VL O SFJEWALK a pAVEp 4 S LDEAS w — — — — CONSTRUCTION d U-Ts E GREEN{r IMPROVELIENTB I'%�nERD,ESDEMDLmoFI OF7i' CVRRA CUTLER, SIDEWAI n3, - / FFNCE6OUARDRAR. m ioY ���vC �i3fe9�9d , GRAPH1C SCALES " 2 R-EC I H ED JUL 0 1 Z011 BY: zQ c � W � z3 3 z 0 oW_ �o w96o o 2 h as w o w � o H s w H o U � � � O Ln UO � w 41 -10 G North Carolina Department of Environmental Quality Pat McCrory Governor September 28, 2015 Mr. Neal Paul, Deputy Public Works Officer MCB Camp Lejeune Buildin 1005 Michael Road Camp ejeune, NC 28547 Subject: USMC Stormwater Permit Extensions (75 Permits — See Attachment A) Onslow County Dear Mr. Paul: Donald R. van der Vaart Secretary On August.5, 2009, the Governor signed Session Law 2009-406. This law impacts any development approval issued by the Division of Energy, Mineral and Land Resources under Article 21 of Chapter 143 of the General Statutes, which is current and valid at any point between January 1, 2008, and December 31, 2010. The law extends the effective period of any stormwater permit that was set to expire during this time frame up to three (3) years from its current expiration date. On August 2, 2010, the Governor signed Session Law 2010-177, which granted an extra year for an extension of up to four (4) years. As a result, 120 USMC Camp Lejeune permits are impacted. Of the 120 permits, 45 permits have previously been issued extensions and 75 permits have been extended effective today. This is summarized in Attachment A. If you have any questions, need additional copies of the permit or approved plans, please contact Kelly Johnson with DEMLR in the Wilmington Regional Office at (910) 796-7331. 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