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HomeMy WebLinkAboutSW6101102_HISTORICAL FILE_20110128STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW &Za1z,4t DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE YYYYM M DD N w :✓ NCDENR North Carolina Department of Environment and Natural Resources Beverly Eaves Perdue Governor Mr. Craig Lantz Fort Bragg DPW - WMB 2175 Reilly Road Stop A Fort Bragg, INC 28310-5000 Division of Water Quality Coleen H. Sullins Director January 26, 2011 Dee Freeman Secretary E)E VF —FF?® JAN 2 8 2011 Subject: Stormwater Permit No. SW6101102 — PLAN REVISION [)WQ Warrior in Transition Complex - Barracks �Y High Density Bio-Retention & Infiltration Trench Project Cumberland County Dear Mr. Lantz The Stormwater Permitting Unit received a plan revision request to revise Stormwater Management Permit for Warrior in Transition Complex - Barracks on January 24, 2011. Staff review of the plan revision has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000 and Session Law 2006-246. We are forwarding a revised Permit No. SW6101102, dated January 26, 2011, for the construction, operation and maintenance of the subject project and the stormwater BMPs. This permit shall be effective from the date of issuance until December 8, 2020, 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 inspection and maintenance of the stormwater management system will result in future compliance problems. 2.36 acres of existing impervious area will be removed from the site. This will allow for 2.06 acres of the new 7.46 acres total impervious area to not be treated. This plan revision increased the impervious area that is not treated from 1.94 acres to 2.06 acres; which is still less than the amount of existing impervious area being removed. 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 to the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. This project will be kept on file at the Fayetteville Regional Office. If you have any questions, or need additional information concerning this matter, please contact Robert Patterson at (919) 807-6375; or robert.patterson@ncdenr.gov. Wetlands and Stormwater Branch 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Locabon: 512 N. Salisbury St. Raleigh, North Carolina 27604 Phone: 919-807.63001 FAX: 919-807-64941 Customer Service: 1-877-623-6748 Internet: vi w it waterquality.org An Equal Opportunity 1 Affirmative Action Employer NorthCarolina Naturally Mr. Craig Lantz SW6101 102 — Warrior in Transition Complex - Barracks January 26, 2011 C Sincerely, for/Colleee�nn H. Sullins cc: Fayetteville Regional Office SW6101102 File ec: Mr. Donnie Stovall — Civil Consultants of AL, Inc. Page 2 of 2 State Stormwater Permit Permit No. SW6101102 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 Fort Bragg Directorate of Public Works Warrior in Transition Complex - Barracks NW corner of Normandy Dr. & Half St., Fort Bragg, Cumberland County FOR THE construction, operation and maintenance of eight bioretention cells and two underground infiltration trenches in compliance with the provisions of Session Law 2006-246 and 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 8, 2020, 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 in Section 1.8 and 1.9 of this permit. The stormwater control has been designed to handle the runoff from 240,190 square feet of impervious area. An additional 2.06 acres of impervious area will not be treated based on existing impervious area credit. 3. In lieu of the overflow from the infiltration trenches going to vegetated filter strips, the overflow for trench 1 will sheet flow through a vegetated slope into a dry detention basin; and the overflow for trench 2 will go into another dry detention basin. 4. The tract will be limited to the amount of built -upon area indicated in Section 1.8 and 1.9 of this permit, and per approved plans. Page 1 of 9 State Stormwater Permit Permit No. SW6101102 91 All stormwater collection and treatment systems must be located in either dedicated common areas or recorders easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. The built -upon areas associated with this project shall be located at least 30 feet landward of all perennial and intermittent streams. The following design criteria have been provided in the infiltration trenches and must be maintained at design condition: a. Drainage Area, 9cres: Onsite, ft : Offsite, ft2: b. Total Imperviou? Surfaces, ft2: Onsite, ft : Offsite, ft2: C. Design Storm, inches: d. Trench Length ft: e. Trench Width, ft: f. Trench Height, ft: g. Perforated Pipe Diameter / Length: h. Bottom Elevation, FMSL: i. Bypass Weir Elevation, FMSY j. Permitted Storage Volume, ft k. Type of Soil: I. Expected Infiltration Rate, in/hr: M. Seasonal High Water Table, FMSL: n. Time to Draw Down, days: o. Receiving Stream: UT to P. Stream Index Number: q. Classification of Water Body: r. River Basin: Trench 1 Trench 2 1.72 5.84 75,135 254,390 0 0 52,961 134,869 52,961 134,869 .0 0 1.0 1.0 310.0 - 185.0 18.0 14.0 3.0 6.5 no pipe 60" / 379' 305.5 295.37 309.0 301.87 6,696 11,363 Clayey Sand Silty Sand 0.67 2.25 302.0 293.0 3.73 1.89 Beaver Crk UT to Tank Crk 18-31-24-5 18-23-27 „C" „C„ Cape Fear Cape Fear Page 2 of 9 State Stormwater Permit Permit No. SW6101102 N The following design criteria have been provided in the bioretention cells and must be maintained at design condition: a. Drainage Area, ?cres: Onsite, ft : Offsite, ftz: b. Total Impervious Surfaces, ftz: Onsite, ft : Offsite, ftz: C. Design Storm; inches: d. Ponding Depth, inches: e. SHWT, fmsl: f. Planting Media Depth, feet: g. Cell Dimensions, feet: h. Planting Elevation, fmsl i. Bottom Surface Area, ft2: j. Permitted Storage Volume, ft3: k. Bypass / Storage Elevation, fmsl I. Drawdown Time, hours: M. Underdrain Diameter, inches: n. Total number of plants provided: o. Receiving Stream/River Basin: P. Stream Index Number: q. Classification of Water Body: (9 continues on page 4) Cell 1 Cell 2 0.27 0.14 11,761 5,969 0. 0 4,020 2,472 4,020 2,472 0 0 1.0 1.0 12 12 300.0 300.0 2.0 2.0 60x21 57x27 313.5 316.5 1,260 1,539 1,260 1,539 314.5 317.5 36 36 6.0 6.0 grass sod grass sod UT to Beaver Crk / Cape Fear 18-31-24-5 „C„ Page 3 of 9 State Stormwater Permit Permit No. SW6101102 9 continued Cell Cell Cell Cell Cell Cell a. Drainage Area, acres: 0.29 0.37 0.41 0.34 0.32 0.36 Onsite, ft : 12,632 16,268 17,995 14,810 13,939 15,682 Offsite, ft2: 0 0 0 0 0 0 b. Total Impervious Surfaces, ft2: 6,200 6,260 7,877 7,900 7,810 9,821 Onsite, ft : 6,200 6,260 7,877 .7,900 7,810 9,821 Offsite, ft2: 0 0 0 0 0 0 C. Design Storm, inches: 1.0 1.0 1.0 1.0 1.0 1.0 d. Ponding Depth, inches: 12 12 12 12 12 12 e. SHWT, fmsl: 307.5 307.5 307.5 307.5 307.5 307.5 f. Planting Media Depth, feet: 2.0 2.0 2.0 2.0 2.0 2.0 g. Cell Dimensions, feet: 60x22 90x22 105x28 71x10 64x16 64x16 h. Planting Elevation, fmsl 316.5 316.5 315.5 317.5 316.5 316:5 i. Bottom Surface Area, ft2: 1,320 1,980 2,940 710 1,024 1,024 j. Permitted Storage Volume, ft3: 1,320 1,980 2,940 710 1,024 1,024 k. Bypass / Storage Elevation, fmsl: 317.5 317.5 316.5 318.5 317.5 317.5 I. Drawdown Time, hours: 36 36 36 36 36 36 M. Underdrain Diameter, inches: 6.0 6.0 6.0 6.0 6.0 6.0 n. Total number of plants provided: grass sod grass sod grass sod grass sod grass sod grass sod o. Receiving Stream/River Basin: UT to Beaver Crk / Cape Fear P. Stream Index Number: 18-31-24-5 q. Classification of Water Body: "C" Page 4 of 9 State Stormwater Permit Permit No. SW6101102 II. SCHEDULE OF COMPLIANCE 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 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 bypass structure, filter media, flow spreader, catch basins, piping and vegetated filter. g. A clear access path to the bypass structure must be available at all times. 4. Records of maintenance activities must be kept for each permitted BMP. The records will indicate the date, activity, name of person performing the work and what actions were taken. 5. The permittee shall submit to the Division of Water Quality an annual summary report of the maintenance and inspection records for each BMP. The report shall summarize the inspection dates, results of the inspections, and the maintenance work performed at each inspection. 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. 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 shall be maintained via appropriate easements at all times. Page 5 of 9 State Stormwater Permit Permit No. SW6101102 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, inc!uding, 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, lease 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. 10. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 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 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. III. GENERAL CONDITIONS 1. 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 completed. Name/Ownership Change form to the Division of Water Quality, signed by both parties, and accompanied by the supporting documentation as listed on page 2 of 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. 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, 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. 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. Page 6 of 9 State Stormwater Permit Permit No. SW6101102 ,r 7. The permit issued shall continue in force and effect until revoked or terminated. 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. 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. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 10. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws, rules and regulations contained in Session Law 2006- 246, Title 15A NCAC 21-1.1000, and NCGS 143-215.1 et.al. 11. The permittee shall notify the Division in writing of any name, ownership or mailing address changes at least 30 days. 12. The permittee shall submit a renewal request with all required forms and documentation at least 180 days prior to the expiration date of this permit. Permit issued this the 26rh day of January, 2011. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Division of Water Quality By Authority of the Environmental Management Commission Page 7 of 9 State Stormwater Permit . Permit No. SW6101102 Warrior in Transition Complex - Barracks Stormwater Permit No.-.SW6101102 Cumberland Countv Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL Page 8 of 9 State Stormwater Permit Permit No. SW6101102 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 bypass structure elevations are per the approved plan. 6. The bypass structure is located per the approved plans. 7. A 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. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. Submit this Designer's Certification to: DWQ Fayetteville Regional Office Surface Water Protection 225 Green Street Systel Bldg. Suite 714 Fayetteville, NC 28301-5043 Page 9 of 9 LCI /CIVIL CONSULTANTS of AL INC. 3525 Vann Road, Suite 105, Birmingham, AL 35235 Phone: (205) 655-1991 FAX: (205) 655-8366 January 20, 2011 Mr. Robert Patterson NC Department of Environmental and Natural Resources DWQ — Wetlands Stormwater Branch 512 N. Salisbury St. Raleigh, NS 27604 Re: Ft Bragg WIT Barracks —DWQ Submittal SW6101102 Dear Mr. Patterson This letter is to request a site plan revision to the permit. The revision is to change the amount of impervious area being treated by the bio-retention cells. The original design was for the runoff from building roofs to discharge onto splash blocks and travel overland to the bio-retention cells for treatment. There are three areas on the buildings where discharging onto splash blocks is not possible. These areas are now to be carried to the storm system via roof drain leaders. These areas amount to 0.12 acres th now be bypassing treatment. The approved and revised areas are as follows/ ✓,y — Existing Impervious area = 2.36 acres i — Bypass area as permitted = 1.94 acres �• 2 — Revised bypass area = 2.06 acres As slated above the revised bypass area is still less than the existing impervious areh� site. Please contact me or Donnie Stovall at 205-655-1991 if you have any questions. Sincerely, CIVIL CONSULTANTS OP AL, INC. Patrick Rosenow, P.E. Project Engineer Da v " " oon, P.E. N.C. PE # 36508 Principal sc✓G!b/10 2— Schnabel E N G I N E E R I N G December 1, 2010 Mr. Frank Tanahey, PE B.L. Harbert International, LLC 820 Shades Creek Parkway, Suite 3000 Birmingham, AL 35209 Subject: Infiltration Testing and Test Pits Warrior In Training (WIT) Barracks Complex Fort Bragg, North Carolina W9126G-08-D-0017, PN69798 (SE Ref. 09100038.00.05) Dear Mr. Tanahey: JAN 2 8 2011 DtAJQ As requested by BL Harbert and Donnie Stovall with Civil Consultants, Inc., a Schnabel Engineering South, PC (Schnabel) representative visited the project site to excavate test pits and conduct in -situ double ring infiltrometer tests to aid in determining the seasonal high water table (SHWT) and infiltration rate of the onsite soils at select locations for the Warrior In Training (WIT) Barracks Complex. At the time of this work, the site was graded at or near the proposed finished soil subgrade and the storm water boxes were in place in each bio retention basin. Test pits were excavated in the areas noted on the attached plan. Test pits for the bio retention basins were extended to approximately four (4) feet below the bottom of the basin (approximately eight (8) feet below the existing finished soil subgrade). TP-8 was terminated at four (4) feet due to difficult digging. The soil types encountered in the test pits were similar across the site and as noted in the test borings in our geotechnical report dated April 9, 2010. The test pit data is included in the table below. Test Pit Table Test Pit No. Approximate Location Depth below Finish Soil Subgrade (fl) Soil Type Groundwater Encountered TP-1 Infilt. Trench 1 (east end) 6 Lean Clay (CL) No TP-2 Infilt. Trench 2 6 Lean Clay (CL) No TP-3 Infilt. Trench 1 (west end) 6 Clayey Sand (SC) No TP-4 Infilt. Trench 1 (west end) 6 Clayey Sand (SC) No TP-5 Bio-R1 8 Clayey Sand (SC) No TP-6 Bio-R3 8 Lean Clay (CL) No Schnabel-eng.com T/803-796-6240 F/803-796-6250 104 Corporate Blvd., Suite 420 / West Columbia, SC / 29169 TP-7 Bio-R6 8 Lean Clay (CL) No TP-8 Infilt. Trench 2 4 Silty Sand (SM) No TP-9 Bio-R2 8 Silty Sand (SM) No TP-10 Bio-R5 8 Clayey Sand (SC) No TP-11 Bio-R4 8 Clayey Sand (SC) No TP-12 Bio-R7 8 Lean Clay (CL) No TP-13 Bio-R8 8 Clayey Sand (SC) No Based on our observations and the test pit data, we did not encounter any water in the test pits. Therefore, the SHWT is below the depth of the test pit excavation, thus below the prescribed limits. In -situ double ring infiltrometer testing was conducted at two locations as noted on the attached plan. The location and elevation of each test was determined by Donnie Stovall of Civil Consultants. The results of the infiltration tests are included below. Infiltration Rate Summary Table USDA Elevation Infiltration Rate Test Location Soil classification Soil (ft) (in/hr) Texture Sandy 1 - Infiltration Trench #1 304.5 Clayey sand (SC) 0.67 Loam Sandy 2- Infiltration Trench #2 295.0 Silly sand (SM) 2.25 Loam Based on the infiltration test results, the infiltration rate at each location was above the required minimum infiltration rate. This letter has been prepared to aid in the site evaluation and to assist members of the project team. It only addresses the specific areas observed. We have endeavored to prepare this letter in accordance with generally accepted geotechnical engineering practice and make no warranties, either expressed or implied, as to the professional advice provided. We appreciate the opportunity to be of service for this project. Please do not hesitate to contact the undersigned if clarification is needed for any aspect of this report. Very truly yours, SCHNABEL ENGINEERING SOUTH, PC Stephen Hahn Associate Richard H. Wargo, PE Principal Project 09190038 / November 22, 2010 Page 2 Schnabel Engineering South, PC SH:RW Attachments Test Pit and Infiltration test location plan Distribution (via email): Michael Grier— BL Harbert Donnie Stovall — Civil Consultants Project 09190038 / November 22, 2010 Page 3 Schnabel Engineering South, PC I WIT'Barracks'Complex 09190038.00 . 1 .29 10.uc,omsw,.m,nms wrenornrcawaE,a.eanw „'— ® Approximate location of test pits (TP-1 through TP-13) zPo ® Apprroximate location of infiltration tests (Test 1 and 2) t 1< i�l Ic�ll 1 rTi '� `� •Y ' ' „ ,I IIII ,I, #II,I IIItiSII' I I j !' _ • -^ r, ��� .I II'j II' ' ; I,! ;< aTest 1 on P 81Y" I _ I (� > I I I III �oil iT I f Pll? I I�.III TP HALF STREET I December 2, 2010 JAN 2 8 2011 ®W` Wad1 Mr. Robert Patterson NC Department of Environmental and Natural Resources DWQ — Wetlands Stormwater Branch 512 N. Salisbury St. Raleigh, NS 27604 Re: Pt Bragg WIT Barracks — DWQ Submittal Dear Mr. Patterson DrH 0 3 2010 -;; 0 ', 2010 This letter is in response to the comments we received from you regarding the WIT Barracks project dated November 12, 2010. Below is a summary of our revisions based on the numbered comments we received from you. 1. The infiltration trench 1 detail has been moved to sheet DT-104, which is included with this revision submittal. 2. Calculations on all BMPs have been checked for consistency and revised as needed. Simple Method calculations have been added for the infiltration trenches. 3. Calculations on all BMPs have been checked for consistency and revised as needed. 4. Calculations on all BMPs have been checked for consistency and revised as needed. 5. Infiltration testing results within the BMP footprints have been provided. 6. SH WT testing results within the BMP footprints have been provided. 7. CS-103 has been revised to clarify areas not receiving treatment to 85% TSS and to quantify the proposed amounts of impervious surface in these areas. A table has been provided to clearly show the amounts of impervious surfaces existing and proposed. 8. Drawdown calculations have been provided in the infiltration trench supplemental calculations. 9. A vegetative filter strip is provided for infiltration trench 1. A vegetative filter strip is not provided for infiltration trench 2. The volumes in excess of the treatment volume for this trench are conveyed to the above ground detention pond though the use of weirs in the infiltration trench inlet manholes. This stonnwater will travel across the vegetated bottom of the pond before exiting the pond through the outlet control structure. In the event that the pond starts staging and storing water the additional detention period will aid in treating the overflow volumes through settlement before leaving the pond. If the pond reaches a point when the emergency overflow spillway is utilized the water will pass over the vegetated spillway which will further treat the overflow. With these further controls in place for the overflow volumes the filter strip requirement is met. CCI� We hope that we have addressed each of your comments appropriately. Please contact i 1 11 or Donnie Stovall at 205-655-1991 if you have any questions. Sincerely, Patrick Rosenow Project Engineer Civil Consultants of AL, Inc. GA NCDENR North Carolina Department of Environment and Natural Resources Beverly Eaves Perdue Governor Mr. Dormie Stovall Civil Consultants of AL, Inc. 3528 Vann Road, Suite 105 Birmingham, AL 35235 Dear Mr. Stovall: Division of Water Quality Coleen H. Sullins Dee Freeman Director Secretary November 12, 2010 T JAN 2 8 2011 DIM Subject: Request for Additional Information Stormwater Project No. SW6101102 Warrior in Transition Complex - Barracks Cumberland County The Division of Water Quality Central Office received a Stormwater Management Permit Application for the subject project on November 5, 2010. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: il. Please provide 2 copies of sheet DT-100 for infiltration trench 1 as noted on DT-104. DT-100 was note submitted. / 2. The following need to be shown consistently on the supplement forms and calculations for infiltration trenches 1 and 2: minimum treatment volume required (based on 1" using the Simple Method) and volume provided. 3. The treatment volume calculations for infiltration trench 2 is based on DA = 10,890 sf. However, the plans, application, and supplement show the DA = 38,332 sf. Based on the larger DA, the minimum required treatment volume is more than double what is provided. Please make the DA consistent though out, and increase the volume provided if the DA shown on the plans is correct. 4. The treatment volume calculations for infiltration trench 5 is based on DA = 39,639 sf. However, the plans, application, and supplement show the DA = 84,506 sf. The volume provided is large enough using the larger DA shown on the plans. So, the volume provided works, but please make the DA consistent though out. ✓ 5. Infiltration testing must be done within the footprint of each infiltration bmp. Boring B-301 may suffice for infiltration trenches 4 and 5, however they are not within the footprints. Infiltration testing must be done for a minimum of trenches 1-3 within their footprint to ensure that they will be able to function as designed. Minimal, if any, infiltration is stated from B-302 Wetlands and Stormwater Branch 1617 Mail Service Center, Ralegh, North Carolina 27699-1617 One Location: 512 N. Salisbury St. Ralegh, North Carolina 27604 Nortth Carr i na Phone: 91M07-63001 FAX: 919-807w64941 Customer Service: 1-877623-6748 �`I trrr`[ll� Internet: .ncwaterquality.olg An Equal Opportunity 1 Affirmative Action Employer Mr. Donnie Stovall SW6101 102 — Warrior in Transition Complex - Barracks November 12. 2010 and B-303, which are near trenches 1 and 2. A minimum infiltration rate of 0.52 in/hr is required for each trench. /6. SFIWT elevations are provided on the supplements, but no supporting information is provided in the soils report for how or where they are determined. SHWT elevations must be based on at least one boring within the footprint of all BMPs (infiltration trenches and bioretention cells). A. All impervious area must be treated to remove 85% TSS. The area labeled on CS- 103-RI as 0.58 ac. Area 2 to Pond 1 near the center of the site is not treated to 85%. This area appears to drain directly to a dry pond that only receives 50% TSS credit. if this area is shown to have equal less impervious area than the existing impervious area being removed, then it would be allowable. -'�8. Drawdown calculations for the infiltration trenches must be provided to show that the volume draws down within 5 days. ,/9/. Vegetated filter strips (with level spreaders) are required for the overflow from infiltration trenches. Options for waiving this requirement are provided in 16.3.9 of the BM Manual Please note that this request for additional infannation is in response to a preliminary review. The requested information should be received by this Office prior to December 13, 2010, 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, fax, or email 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. It is our understanding that construction of the project has already begun. Please be aware that 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 SW6101102 on all correspondence. If you have any questions concerning this matter please feel free to contact me at (919) 807-6375, or robert.patterson a ncdenr.gov. Sincerely, Robert D. Patterson, PE Environmental Engineer Stormwater Permitting Unit cc: Mr. Craig Lantz— Fort Bragg DPW-WMB Fayetteville Regional Office — Mike Lawyer SW6101102 File Page 2 of 2 LCl/CIVIL CONSULTANTS & AL, INC. )t:N Vann Itnnd, Sullc IOi, IIIrmloFham. AI, ic=i5 1'hnne: I:I/KI 6GG.IYYI IS\xa-'IBI M15S•N36h December 8, 2010 Mr. Robert Patterson NC Department of Environment and Natural Resources DWQ - Wetlands and Stormwater Branch 512 N. Salisbury St. Raleigh, NC 27604 Re: Ft Bragg WIT Barracks Dear Mr. Patterson, DE',"' _^ JAN Z 8 2011 Oio? 1030 M(@;14 This letter is to clarify differences between the approved plans and what will be issued to the contractor in the field. Each revision to the plans that has been submitted to your office has been updated with a new Sitework Bulletin number (SWB #X), and the changes clouded. The contractor has seen these iterations in order to "keep him in the loop" but these plans have not been issued to him for construction pending approval. The plans that have been ultimately approved by NCDENR show SWB #6 being the latest revision, but because the contractor has not been officially issued the intermediate revisions sent to your office, the next official revision to the project will be SWB #5. Please know that the field set of plans labeled SWB 5 will be the same plans as approved by your office (with the minor revisions attached with this letter). As we discussed earlier, the pipe size of the pipe leaving the small detention pond increased to 24", but did not get corrected on the plans. The detail for the outlet control weir for this pond was also modified per the re -design of this area, and was not fully updated. The plans showing these changes are attached to this letter, and comply with the calculations submitted and approved by NCDENR. Sincerely, David Moon, P.E Principal cc: Michael Grier, BL Harbert Attachment Donnie Stovall, P.E. Project Manager October 27.2010 Mr. Robert Patterson NC Department of Environment and Natural Resources DWQ - Wetlands and Stormwater Branch 512 N. Salisbury St. Raleigh, NC 27604 Re: Ft Bragg WIT Barracks —DWQ Submittal Dear Mr. Patterson, This letter is in response to the comments we recei e from you regarding the WIT Barracks project dated September 30, 2010. Below is a summary of our revisions based on the numbered comments we received from you. . We have removed all proprietary devices from the plans. An Infiltration Trench #4 was added to the plans to treat the storm water runoff from the basin that contributed to the previously shown Isolator Row. This trench #4 has been sized adequately to treat runoff from this basin. The 5 infiltration trenches were renumbered to maintain a consistent pattern on site. 2. The basin map shown on CS-103 has been revised to show more clearly the drainage areas for each BMP. 3. All BMPs on site have been labeled on sheets CS-100, CS-101 and CS-102. 4. With regard to storm water treatment, Site Work Bulletin #1 included adding infiltration pipes in place of removed bioretention ponds. The current design has been shown on the plans included in this submittal. All relevant design information and application sheets are included and should suffice for this review. 5. A full geotechnical report has been included with this submittal. 6. A 2-sheet set of calculations for the five infiltration trenches has been included in the supporting material of the storm report. This is an additional set of calculations that include information used to determine treatment volumes and pipe sizes. 7. The P-index and sod type have been called out on detail sheet DT-101 for the bioretention cells. C� 8. There is one infiltration trench on site that has been shown on partial fill. The upper CCI few feet of Infiltration Trench #1 is in fill but the lower portion of the trench is located in existing soil. 9. A note has been added to sheet CS-100 indicating that no wetlands are located on site 10. No BUA credits will be taken for this project. The areas to be treated and bypass areas have been noted on sheet CS-103 and the SWU Application. All existing pavement (and other impervious areas) on site will be removed as part of this project. We hope that we have addressed each of your comments appropriately. Please let me know if there are any items that we have overlooked. You may contact me or Donnie Stovall at 205-655-1991. Sincerely, Eric N. Smith, PE Project Engineer Civil Consultants of AL, Inc cc: David Moon, CCI Michael Grier, BL Harbert NCDENR North Carolina Department of Environment and Natural Resources Beverly Eaves Perdue Governor Mr. Donnie Stovall Civil Consultants of AL, Inc. 3528 Vann Road, Suite 105 Birmingham, AL 35235 Dear Mr. Stovall: Division of Water Quality Coleen H. Sullins Director November 12, 2010 NOV i 9 2U1U 10RI VGA Subject: Request for Additional Information Dee Freeman Secretary Stormwater Project No. SW6101102 Warrior in Transition Complex - Barracks Cumberland County The Division of Water Quality Central Office received a Stormwater Management Permit Application for the subject project on November 5, 2010. 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 provide 2 copies of sheet DT-100 for infiltration trench 1 as noted on DT-104. DT-100 was note submitted. 2. The following need to be shown consistently on the supplement forms and calculations for infiltration trenches 1 and 2: minimum treatment volume required (based on 1" using the Simple Method) and volume provided. 3. The treatment volume calculations for infiltration trench 2 is based on DA = 10,890 sf. However, the plans, application, and supplement show the DA = 38,332 sf. Based on the larger DA, the minimum required treatment volume is more than double what is provided. Please make the DA consistent though out, and increase the volume provided if the DA shown on the plans is correct. 4. The treatment volume calculations for infiltration trench 5 is based on DA = 39,639 sf. However, the plans, application, and supplement show the DA = 84,506 sf. The volume provided is large enough using the larger DA shown on the plans. So, the volume provided works, but please make the DA consistent though out. 5. Infiltration testing must be done within the footprint of each infiltration bmp. Boring B-301 may suffice for infiltration trenches 4 and 5, however they are not within the footprints. Infiltration testing must be done for a minimum of trenches 1-3 within their footprint to ensure that they will be able to function as designed. Minimal, if any, infiltration is stated from B-302 Wetlands and Stormwater Branch 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 One Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 North Carol lna Phone: 91M07-6300 t FAX: 919-807.64941 Customer Service: 1-877-623-6748 Naturally w .mxatemuality.org An Equal Opportunity 1 Atprmatwe Action Employer Mr. Donnie Stovall SW6101102 — Warrior in Transition Complex - Barracks November 12, 2010 and B-303, which are near trenches 1 and 2. A minimum infiltration rate of 0.52 in/hr is required for each trench. 6. SHWT elevations are provided on the supplements, but no supporting information is provided in the soils report for how or where they are determined. SHWT elevations must be based on at least one boring within the footprint of all BMPs (infiltration trenches and bioretention cells). 7. All impervious area must be treated to remove 85% TSS. The area labeled on CS-103-R1 as 0.58 ac. Area 2 to Pond 1 near the center of the site is not treated to 85%. This area appears to drain directly to a dry pond that only receives 50% TSS credit. If this area is shown to have equal less impervious area than the existing impervious area being removed, then it would be allowable. 8. Drawdown calculations for the infiltration trenches must be provided to show that the volume draws down within 5 days. 9. Vegetated filter strips (with level spreaders) are required for the overflow from infiltration trenches. Options for waiving this requirement are provided in 16.3.9 of the BMP Manual. 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 December 13, 2010, 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, fax, or email 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. It is our understanding that construction of the project has already begun. Please be aware that 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 SW6101102 on all correspondence. If you have any questions concerning this matter please feel free to contact me at (919) 807-6375, or robert.patterson@ncdenr.gov. Sincerely, Robert D. Patterson, PE Environmental Engineer Stormwater Permitting Unit cc: Mr. Craig Lantz— Fort Bragg DPW-WMB Fayetteville Regional Office — Mike Lawyer SW6101102 File Page 2 of 2 Al2:�� w :' NC®ENR North Carolina Department of Environment and Division of Water Quality Beverly Eaves Perdue Governor Coleen H. Sullins Director December 8, 2010 Natural Resources Dee Freeman Secretary Mr. Craig Lantz WDENR—FRO Fort Bragg DPW - WMB �Ald 1 $ 2011 2175 Reilly Road Stop A Fort Bragg, NC 28310-5000 ®VV� Subject: Stormwater Permit No. SW6101102 VV Warrior in Transition Complex - Barracks High Density Bio-Retention & Infiltration Trench Project Cumberland County Dear Mr. Lantz: The Stormwater Permitting Unit received a complete Stormwater Management Permit Application for Warrior in Transition Complex - Barracks on November 5, 2010; with additional information received December 3, 2010. 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 21-1.1000 and Session Law 2006-246. We are forwarding Permit No. SW6101102, dated December 8, 2010, for the construction, operation and maintenance of the subject project and the stormwater BMPs. This permit shall be effective from the date of issuance until December 8, 2020, 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 inspection and maintenance of the stormwater management system will result in future compliance problems. 2.36 acres of existing impervious area will be removed from the site. This will allow for 1.94 acres of the new 7.46 acres total impervious area to not be treated. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. This project will be kept on file at the Fayetteville Regional Office. If you have any questions, or need additional information concerning this matter, please contact Robert Patterson at (919) 807-6375; or robert.patterson@ncdenr.gov. Wetlands and Stormwater Branch 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 Location: 512 N. Salisbury St. Raleigh, North Carolina 27604 Phone: 919-807-63001 FAX: 919-807-64941 Customer Service: 1-877-623-6748 Internet: w .ncwaterquality.oig An Equal Opportunity \ Affumative Action Employer No thCarolina Mr. Craig Lantz SW6101102 — Warrior in Transition Complex - Barracks December 8, 2010 Sincerely, for oleen H. Sullins cc: . Fayetteville Regional Office SW6101102 File ec: Mr. Donnie Stovall — Civil Consultants of AL, Inc. Page 2 of 2 State Stormwater Permit Permit No. SW6101102 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 Fort Bragg Directorate of Public Works Warrior in Transition Complex - Barracks NW corner of Normandy Dr. & Half St., Fort Bragg, Cumberland County FOR THE construction, operation and maintenance of eight bioretention cells and two underground infiltration trenches in compliance with the provisions of Session Law 2006-246 and 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 8, 2020, 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 1.8 and 1.9 of this permit. The stormwater control has been designed to handle the runoff from 240,190 square feet of impervious area. An additional 1.94 acres of impervious area will not be treated based on existing impervious area credit. 3. In lieu of the overflow from the infiltration trenches going to vegetated filter strips, the overflow for trench 1 will sheet flow through a vegetated slope into a dry detention basin; and the overflow for trench 2 will go into another dry detention basin. 4. The tract will be limited to the amount of built -upon area indicated in Section 1.8 and 1.9 of this permit, and per approved plans. Page 1 of 9 State Stormwater Permit Permit No. SW6101102 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. M 7 The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. The built -upon areas associated with this project shall be located at least 30 feet landward of all perennial and intermittent streams. The following design criteria have been provided in the infiltration trenches and must be maintained at design condition: Trench 1 a. Drainage Area, 9cres: 1.72 Onsite, ft : 75,135 Offsite, ft2: 0 b: Total Impervious Surfaces, ft2: 52,961 Onsite, ft : 52,961 Offsite, ft�: 0 C. 'Design Storm, inches: 1.0 d. Trench Length ft: 310.0 e. Trench Width, ft: 18.0 f. . Trench Height, ft: 3.0 g. ; Perforated Pipe Diameter / Length: no pipe h. Bottom Elevation, FMSL: 305.5. i. Bypass Weir Elevation, FMSY 309.0 j.. Permitted Storage Volume, ft : 6,696 k. Type of Soil: Clayey Sand I. Expected Infiltration Rate, in/hr: 0.67 m.. Seasonal High Water Table, FMSL: 302.0 n. Time to Draw Down, days: 3.73 o. Receiving Stream: LIT to Beaver Crk P. Stream Index Number: 18-31-24-5 q. Classification of Water Body: "C" r. River Basin: Cape Fear Trench 2 5.84 254,390 0 134,869 134,869 0 1.0 185.0 14.0 6.5 60" / 379' 295.37 301.87 11,363 Silty Sand 2.25 293.0 1.89 LIT to Tank Crk 18-23-27 ,.C., Cape Fear Page 2 of 9 State Stormwater Permit Permit No. SW6101102 Q The following design criteria have been provided in the bioretention cells and must be maintained at design condition: a. Drainage Area, acres: Onsite, ft : Offsite, ft2: b. Total Impervious Surfaces, ft2: Onsite, ft Offsite, ft2: c. Design Storm, inches: d. Ponding Depth, inches: e. SHWT, fmsl: f. Planting Media Depth, feet: g. Cell Dimensions, feet: h. Planting Elevation, fmsl- i. Bottom Surface Area, ft2: j. Permitted Storage Volume, ft3: k. Bypass / Storage Elevation, fmsl: I. Drawdown Time, hours: M. Underdrain Diameter, inches: n. Total number of plants provided: o. Receiving Stream/River Basin: p. Stream Index Number: .q. Classification of Water Body: (9 continues on page 4) Cell 1 Cell 2 0.27 0.14 11,761 5,969 0 0 4,020 2,472 4,020 2,472 0 0 1.0 1.0 12 12 300.0 300.0 2.0 2.0 60x21 57x27 313.5 316.5 1,260 1,539 1,260 1,539 314.5 317.5 36 36 6.0 6.0 grass sod grass sod UT to Beaver Crk / Cape Fear 18-31-24-5 "C„ Page 3 of 9 State Stormwater Permit Permit No. SW6101102 9 continued: a. Drainage Area, acres: Onsite, ft : Offsite, ft2: b. Total Impervious Surfaces, ft2: Onsite, ft Offsite, ft2: C. Design Storm, inches: d. Ponding Depth, inches: e. SHWT, fmsl: f. Planting Media Depth, feet: g. Cell Dimensions, feet: h. Planting Elevation, fmsl, i. Bottom Surface Area, ft2: j. Permitted Storage Volume, ft3: k. Bypass / Storage Elevation, fmsl I. Drawdown Time, hours: M. Underdrain Diameter, inches: n. Total number of plants provided: o. Receiving Stream/River Basin: P. Stream Index Number: q. Classification of Water Body: Cell 3 0.29 12,632 0 6,200 6,200 0 1.0 12 307.5 2.0 60x22 316.5 1,320 1,320 317.5 36 6.0 Cell 4 0.37 16,268 0 6,260 6,260 0 1.0 12 307.5 2.0 90x22 316.5 1,980 1,980 317.5 36 6.0 Cell 5 0.41 17,995 0 7,877 7,877 0 1.0 12 307.5 2.0 105x28 315.5 2,940 2,940 316.5 36 6.0 grass sod grass sod grass sod UT to Beaver Crk / Cape Fear 18-31-24-5 „C„ Cell 6 0.34 14,810 0 7,900 7,900 0 1.0 12 307.5 2.0 71x10 317.5 710 710 318.5 36 6.0 grass sod Cell 7 0.32 13,939 0 7,810 7,810 0 1.0 12 307.5 2.0 64x16 316.5 1,024 1,024 317.5 36 6.0 grass sod Cell 8 0.36 15,682 0 9,821 9,821 0 1.0 12 307.5 2.0 64x16 316.5 1,024 1,024 317.5 36 6.0 grass sod Page 4 of 9 State Stormwater Permit Permit No. SW6101102 Il. SCHEDULE OF COMPLIANCE 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 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 bypass structure, filter media, flow spreader, catch basins, piping and vegetated filter. g. A clear access path to the bypass structure must be available at all times. 4. Records of maintenance activities must be kept for each permitted BMP. The records will indicate the date, activity, name of person performing the work and what actions were taken. The permittee shall submit to the Division of Water Quality an annual summary report of the maintenance and inspection records for each BMP. The report shall summarize the inspection dates, results of the inspections, and the maintenance work performed at each inspection. 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. 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 shall be maintained via appropriate easements at all times. Page 5 of 9 State Stormwater Permit Permit No. SW6101102 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, lease 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. 10. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 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 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. III. GENERAL CONDITIONS 1. 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 completed Name/Ownership Change form to the Division of Water Quality, signed by both parties, and accompanied by the supporting documentation as listed on page 2 of 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. 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, 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. 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. Page 6 of 9 State Stormwater Permit Permit No. SW6101102 The permit issued shall continue in force and effect until revoked or terminated. 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. 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. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 10. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws, rules and regulations contained in Session Law 2006- 246, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et.al. 11. The permittee shall notify the Division in writing of any name, ownership or mailing address changes at least 30 days. 12. The permittee shall submit a renewal request with all required forms and documentation at least 180 days prior to the expiration date of this permit. Permit issued this the 8t' day of December, 2010. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION 1<2L e/ for Goleen H. Sullins, Director Division of Water Quality By Authority of the Environmental Management Commission Page 7 of 9 State Stormwater Permit Permit No. SW6101102 Warrior in Transition Complex - Barracks Stormwater Permit No. SW6101102 Cumberland County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL Page 8 of 9 State Stormwater Permit Permit No. SW6101102 Certification Requirements: 1 2 3 m 5. 6. 7. 8. The drainage area to the system contains approximately the permitted acreage. The drainage area to the system contains no more than the permitted amount of built -upon area. All the built -upon area associated with the project is graded such that the runoff drains to the system. All roof drains are located such that the runoff is directed into the system. The bypass structure elevations are per the approved plan. The bypass structure is located per the approved plans. A Trash Rack is provided on the outlet/bypass structure. All slopes are grassed with permanent vegetation. y. Vegetated slopes are no steeper than 3:1. 0. 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. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. Submit this Designer's Certification to: DWQ Fayetteville Regional Office Surface Water Protection 225 Green Street Systel Bldg. Suite 714 Fayetteville, NC 28301-5043 Page 9 of 9