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HomeMy WebLinkAboutSW8010420_CURRENT PERMIT_20200715STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 01 aZu DOC TYPE �, CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE ZnD o71 S YYYYMM DD ROY COOPER Governor MICHAEL S. REGAN Secretary BRIAN WRENN Director July 15, 2020 NORTH CAROLINA Environmental Quality United States Marine Corps Camp Lejeune Attn: Mr. Neal Paul 1005 Michael Road Camp Lejeune, NC 28547 Subject: Permit Renewal State Stormwater Management Permit No. SW8 010420 Tarawa Terrace I, 11, and III Housing Replacement Onslow County Dear Mr. Paul: The Wilmington Regional Office received a complete 8 year Stormwater Management Permit Renewal Application for the subject project on June 2, 2020. The Division is hereby notifying you that permit SW8 010420 has been renewed on July 15, 2020, and shall be effective until November 7, 2027. For your records, please find enclosed a renewed, updated, and re -issued permit and a copy of the renewal application. Please keep this permit on file at all times. Please note that the renewed, updated, and re -issued permit does not impose new or different terms; it merely restates some of the previous terms to provide you with a better understanding of your obligations under the permit. The renewal and reissuance of this stormwater permit does not imply that the site is currently in compliance with the terms and conditions of this state stormwater permit. The plans originally approved on April 18, 2001 and most recently revised on November 7, 2005, will remain in full force and effect in accordance with the regulations set forth in Title 15A NCAC 2H.1000. This permit is subject to the conditions and limitations as specified therein. Please pay special attention to the conditions listed in this permit regarding the Operation and Maintenance of the BMP(s), recordation of deed restrictions, procedures for changes of ownership, transferring the permit, and renewing the permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system, to record deed restrictions, to transfer the permit, or to renew the permit, 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 Fling a written petition with the Office of Administrative Hearings (OAH). The written 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. You should contact the OAH with all questions regarding the filing fee (if a filing fee is required) and/or the details of the filing process at 6714 Mail Service Center, Raleigh, NC 27699-6714, or via telephone at 919-431-3000, or visit their website at www.NCOAH.com. Unless such demands are made this permit shall be final and binding. If you have any questions, need additional copies of the permit or approved plans, please contact Daniel Sams in the Wilmington Regional Office, at (910) 796-7215 or dan.sams@ncdenr.gov. Sincerely, Brian Wrenn, Direc Division of Energy, Mineral and Land Resources Enclosures: Attachment C — Permitting History Renewal Application Documents DESIdan:IllStormwaterlPermits & Pro iects120011010420 HD12020 07 permit 010420 cc: Wilmington Regional Office Stormwater File ®� @�� North Carolina Department of Environmental Quality i Division of Energy, Mineral and Land Resources Wilmington Regional Office 1 127 Cardinal Drive Extension I Wilmington. North Carolina 28405 rvonN can�mn DWv d LM m M` r 910.796.7215 State Stormwater Management Systems Permit No. SW8 010420 Modification STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENTAL QUALITY DIVISION OF ENERGY, MINERAL AND LAND RESOURCES STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT INCLUDING AN AREA SERVED BY AN OFF -SITE STORMWATER CONTROL 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 United States Marine Corps Tarawa Terrace 1, II and Ill Housing Replacement Camp Lejeune, Onslow County FOR THE construction, operation and maintenance of one wet detention pond and impervious areas with runoff to be treated in an offsite permitted stormwater facility in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved b the Division of Water Quality and considered a part of this permit. The s ormwater runoff from the site that is served by an offsite system will be routed to Tarawa Terrace 11 Tarawa Boulevard Pond operated and maintained by Camp LeJ'eune Marine Corps Base under the terms and conditions set forth in Permit No. SW8 051018. This permit retains the Phase 1 D Pond and modifies Permit No. SW8 010420 Modification, issued December 16, 2004, by removing the Phase III Pond (but not the drainage area) from the project area, enlarging and including Pond III as "Tarawa Boulevard Pond" in the Tarawa Terrace II project (Permit No. SW8 051018). The Tarawa Boulevard Pond will serve as an offsite system for the drainage area previously served by Pond III. This permit shall be effective from the date of issuance until November 7, 2027, and shall be subject to the following specified conditions and limitations.- 1. 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 controls for Phase 1 D Pond and the offsite Tarawa Boulevard Pond have been designed to handle the runoff from 3,173,122 square feet and 1,397,969 square feet, respectively, of built -upon area. 1 of 5 State Stormwater Management Systems Permit No. SW8 010420 Modification 3. 4. 5. 6. 7. a. k. I. m Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. The permittee shall limit drainage area to the maximum amount of built -upon area as indicated on page 3 of this permit, and per approved plans. The Phase 1 D Pond must be operated with a 30' vegetated filter. The runoff from all built -upon area within the permitted drainage areas of this project must be directed into the appropriate permitted stormwater control system. The following design criteria have been approved for the proposed wet detention ponds, and must be maintained at design conditions: SW8 010420 SW8 051018, Modification, Offsite Tarawa Phase 1 D Pond Boulevard Pond Drainage Area, acres: 151.43 80.85 Onsite, ft2: 6,596,201 1,643,519 Offsite, ft2: 0 1,878,307 Total Impervious Surfaces, ft2: 3,173,122 1,397,969 Design Storm, inches: 1.0 1.0 Pond Design Depth, feet: 5.0 5.4 TSS Removal Efficiency, %: 85 90 Permanent Pool (PP) Elevation, FMSL: 5.0 11.40 Provided Surface Area, @PP, ft2: 186,870 130,181 Temporary Storage Elevation, FMSL: 6.4 12.6 Permitted Storage Volume, ft3: 277,930 159,439 Controlling Orifice: 2 @5" 0 each 6" 0 Permitted Forebay Volume, ft3: 149,854 121,175 Time to draw down, days: 3.0 2.2 Max. Horsepower for a Fountain: 3 2 n. Receiving Stream/River Basin: White Oak 1 Northeast Creek o. Index Number: 19-16-(3.5) P. Classification of Water Body: "SC HQW NSW" 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. 2of5 State Stormwater Management Systems Permit No. SW8 010420 Modification 2. Erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The Commanding General, Marine Corps Base, Camp Lejeune is the permittee for both the Phase 1 D Pond of this permit and the offsite Tarawa Boulevard Pond (Stormwater Permit No. SW8 051018). The permittee shall at all times provide the operation and maintenance necessary to assure that both the permitted stormwater systems function at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of outlet structure, orifice device, flow spreader, catch basins and piping. g. Access to the outlet structure must be available at all times. 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken. 5. No person or entity, including the permittee, shall alter any component shown in the approved plans and specifications. Prior to the construction of any modification to the approved plans, the permittee shall submit to the Director, and shall have received approval for modified plans, specifications, and calculations including, but not limited to, those listed below. For changes to the project or SCM that impact the certifications, a new or updated certification (s), as applicable, will be required and a copy must be submitted to the appropriate DEQ regional office upon completion of the modification. a. Any modification to the a proved plans and specifications, regardless of size including the SCM(s , BUA, details, etc. b. Redesign or addition to t e approved amount of BUA or to the drainage area. C. Further development, subdivision, acquisition, lease or sale of any, all or part of the project and/or property area as reported in the approved plans and specifications. d. Altering, modifying, removing, relocating, redirecting, regrading, or resizing of any componenf of the approved SCM(s), the stormwater collection syystem and/or vegetative conveyance shown on the approved plan. e. The construction of any allocated future BUA. f. The construction of any permeable pavement, #57 stone area, public trails, or landscaping material to be considered a permeable surface that were not included in the approved plans and specifications. g. Other modifications as determined by the Director. 6. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of eight years from the date of the completion of construction. 7. The permittee must maintain compliance with the proposed built -upon area and ensure that the runoff from all the built -upon is directed into the permitted system. 3 of 5 State Stormwater Management Systems Permit No. SW8 010420 Modification 8. Decorative spray fountains will be allowed in the stormwater treatment system, subject to the following criteria: a. The minimum permanent pool volume is 30,000 cubic feet. b. The fountain must draw its water from less than 2' below the permanent pool surface. C. 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. d. The fountain may not be placed into the forebay. e. The falling water from the fountain must be centered in the main pond, away from the shoreline. f. The maximum horsepower for the fountain's pump is based on the permanent pool volume. The maximum pump power for a fountain in Phase ID Pond is 3 horsepower, and the offsite Tarawa Boulevard Pond is 2 horsepower. 9. 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. 10. The permittee must maintain the current permitted drainage area. No additional runoff from outside of the permitted drainage area boundary may enter the permitted stormwater facilities without first applying for and receiving a permit modification. III. GENERAL CONDITIONS This permit is not transferable to any person or entity except after notice to and approval by the Director. The permittee shall submit a completed and signed "Permit Transfer Application Form" (available on the Division website) accompanied y the required tee and supporting documentation as listed on the form, to the Division at least 60 days prior to any one or more of the following events: a. The sale or conveyance of the project area in whole or in part, except in the case of an individual lot sale that is made subject to the recorded deed restrictions and protective covenants; b. Dissolution of the partnership, corporate, or LLC entity, subject to NCGS 55-14-05 or NCGS 57D-6-07 and 08; c. Bankruptcy; d. Foreclosure, subject to the requirements of Session Law 2013-121. 2. Any individual or entity found to be in noncompliance with the provisions of this stormwater management permit or the requirements of the Stormwater rules is subject to enforcement procedures as set forth in NCGS 143 Article 21. 3. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances which may be imposed by other government agencies (local, state, and federal) which have jurisdiction. 4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 4of5 State Stormwater Management Systems Permit No. SW8 010420 Modification 5. The permittee grants DEQ Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 6. 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. 7. 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. 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. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 10. A permit renewal request must be submitted at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate application, documentation and the processing fee as outlined in Title 15A NCAC 02H.1045(3). Permit issued this the 15th day of July 2020. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION 7, Brian Wrenn, Director Division of Energy; Mineral and Land Resources By Authority of the Environmental Management Commission 5of5 IJEMLH USE ONLY Date Received Fee Paid Permit Number swso 0 o S"C�5`= SW 0 io NC DEQ Division of Energy, Mineral and Land Resources STATE STORMWATER: PERMIT RENEWAL APPLICATION FORM In accordance with 15A NCAC 2H.1045(3), the current permit holder shall renew their high density permit 180 days prior to its expiration. Renewed permits are valid for a period of 8 years per Session Law 2011-398 (SB 781) Section 60.(c). This application form is for permit renewals only. A. PROJECT INFORMATION 1. State Stormwater Permit Number: SW8 010420 2. Project name: Building Tarawa Terrace I _ 3. Project street address: XXX City: MCB Camp Lejeune County: Onslow ZIP: 28542 4. What, if any, changes have been made to the project as permitted? N/A If the project has changed from the original approved plans, please complete SWU-101 for a Major Modification or Minor Modification Application form available at: https://deg.nc.gov/about/divisions/energy- mineral-land-resou rces/energy-mineral-land-rules/stormwater-program/post-Construction. B. PERMITTEE INFORMATION If changes to the permittee or project name have been made, please complete either the Permit Update form or the Permit Transfer form available at: https://deg.nc.gov/about/divisions/energy-mineral-land- resources/energy- mineral- land-rules/stormwater-program/post-construction. State Stormwater Permits do not automatically transfer with the sale of the property. 1. Current Permit Holder's Company Name/Organization: MCB Camp Leieune 2. Signing Official's Name: Neal Paul 3. Signing Official's Title: Deputy Public Works Division 4. Mailing Address: MCB Camp Lejeune 1005 Michael Rd. City: MCB Camp Leieune State: NC ZIP: 28547-2521 5. Street Address: City: State: ZIP 6. Phone: (g10) 451-2213 Email:.neal.paul@usmc.mil tplql Mnve. UN 0 x 020 BY.•� Stormwater Permit Renewal Form Page 1 of 3 May 11, 2018 C. SUBMITTAL REQUIREMENTS Submit the application package to the appropriate DEMLR Regional Office (Coastal, SA Waters) or DEMLR Central Office (Urbanizing Areas Ph 2, USMP, Non -Coastal HQW/ORW). Only applications packages that include all required items listed below will be accepted and reviewed. Initial each item below to indicate that the required information is provided in the application package: �1. A permit application processing fee of $505.00 payable to NCDEQ. )��2. One original signed hard copy and one electronic copy of this completed form. The signing official named on this application to represent the current permittee must meet one of the following: a. Corporation — a principle executive officer of at least the level of vice-president; b. Limited Liability Company (LLC) — a manager or company official as those terms are defined in G.S. 57D "North Carolina Limited Liability Company Act;" c. Public Entity — a principal executive officer, ranking official, or other duly authorized employee; d. Partnership or limited partnership — the general partner; e. Sole proprietor; or f. Letter of authorization signed by one of the signatories noted in a — e above authorizing the signature of another entity. 3. One hard copy and one electronic copy of recorded documents required by the original permit that have not yet been received by DEMLR, including: deed restrictions, protective covenants, condominium/planned community declaration and easements. If the project has been built, include documentation that the maximum BUA per lot or maximum total BUA has not been exceeded. If the project has not been built, include a signed agreement that the final recorded deed restrictions and protective covenants will be submitted at a later date. 4. O&M Agreements, Please select one: ® I have a copy of the current recorded O&M Agreement for all SCMs, and I will continue to keep this on file with the permit; or ❑ I do not have a copy of the current recorded O&M Agreement for all SCMs and am requesting a copy be sent to me. I agree to keep this on file with the permit. 5. Designer Certifications, Please select one: ® A copy of the certification(s) confirming that the project was built in accordance with the approved plans have been previously provided to the Division; or ❑ A copy of the certification(s) confirming that the project was built in accordance with the approved plans are enclosed; or ❑ The project has not yet been built. 6. [IF APPLICABLE] if the project has been built, one original hard copy and one electronic copy of a signed, sealed, and dated letter from a licensed professional stating that the SCMs have been inspected, and that they have been built and maintained in accordance with the permit. 7. [IF APPLICABLE] When the permittee is a corporation or a limited liability corporation (LLC): Provide one hard copy and one electronic copy of documentation from the NC Secretary of State, or other official documentation, which supports the titles and positions held by the persons listed in Section C.2 per 15A NCAC 2H. 1043(3)(b). https://www.sosnc.gov/online services/search/by title/ Business Registration JUN 0 2 2020 BY: Stormwater Permit Renewal Application Form Page 2 of 3 May 11, 2018 D. RERMITfTEE'Sk CERTIF ATION I, "Ejt� J (/Lt ASCL - the person legally responsible for the permit, certify that I have a copy of the Permit and O&M Agreement on site (or I will obtain a copy and it will be kept on site), that I am responsible for the performance of the maintenance procedures, and the site has been and will be maintained according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs or built -upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the project, SCMs, or ownership. All in�f rmation provided on this permit renewal application is, to the best of my knowledge, cor ect and compye# . Signature: Date: NOTAFUZATION--1 this pL'eLtG ::C.? My commission expires a Notary Public for the State of do hereby certify personally appeared before me day of �� , 20�_=� , and acknowledge the due g instrument. Witness my hand and official seal, ma JUN 0 22020 T F BY:— Stormwater Permit Renewal Application Form Page 3 of 3 May 11, 2018 D. PERMITTEE'S CERTIFICATION I,de the persoh legally responsible for the permit, certify that I have a copy of the Permit and O& greement on site (or 1 will obtain a copy and it will be kept on site), that I am responsible for the performance of the maintenance procedures, and the site has been and will be maintained according to the O&M Agreement and approved plans. I agree to notify DEMLR of any problems with the SCMs or built -upon area and to submit the proper forms to modify or transfer the permit prior to any changes to the project, SCMs, or ownersh'p. information provided on this permit renewal application is, to the best of my knowledge, correct an ete. Signature: Date: NOT XR1ZMION: County of that iu�L�t►.r��� this the 71 .01 day of ng instrument. Witness my hand and official seal, IQAR y, I AUBOG No�Signature My com<Ow-Go V a "fS isww,ed ?ires a Notary Public for the State of do hereby certify personally appeared before me 20 ZD , and acknowledge the due JUN' Stormwater Permit Renewal Application Form Page 3 of 3 May 11, 2018 a ,41t�'�t�lfrh��iip�„ i .r` ti,l� _� . J r..;�� �..;rr�1�t��t�y`'` Central Files: APS _ SWP _ 7/15/2020 Permit Number Permit Tracking Slip Program Category Status Project Type Permit Type Version Permit Classification Primary Reviewer Coastal SWRule Permitted Flow Facility Permit Contact Affiliation Facility Name Major/Minor Region Location Address County Owner Owner Name Facility Contact Affiliation Owner Type Owner Affiliation Dates/Events Scheduled prig Issue App Received Draft Initiated Issuance Public Notice Issue Effective Expiration Regulated Activities Requested /Received Events Outfal! Waterbody Name Streamindex Number Current Class Subbasin Burd, Tina J From: Burd, Tina J Sent: Friday, June 19, 2020 8:57 AM To: Barraco CIV Talia M Subject: SW8 010420 - Building Tarawa Terrace I The Wilmington Regional Office of the Division of Energy, Mineral and Land Resources (Stormwater Section) accepted the Stormwater Permit Renewal Application and $505.00 fee for the subject project on June 2, 2020. The project has been assigned to Dan Sams and you will be notified if additional information is needed. Best Regards, Tina Burd Administrative Associate II Wilmington Regional Office Division of Environmental Assistance & Customer Service Phone 910-796-7215 NCDEQ Wilmington Regional Office 127 Cardinal Drive Ext. Wilmington, NC 28405 Email correspondence to and from this address is subject to the North Carolina Public Records Law and may be disclosed to third parties. Application Completeness Review Checklist (Non -Transfers) - Short Version Project Name: `rgeA04 _f6 ACE DA)6 H",Z a Date Delivered to WIRO: zo 7- Project County/Location: p4V Z M C BIMS Received/Accepted Date: ZvlZj Rule(s): F�2017 Coastal 1:12009 Coastal 01995 Coastal 81MS Acknowledged Date': Phase 11 Universal El1988 Coastal Permit Action: New Major Mod / Minor Mod enewal Permit Type: !� LD / LD Overall / HD &LD Combo General Permit / Off site / Exempt / Rescission Development Type: Commercial / Residential / Other Subdivided?: Subdivision or Single Lot "' Permittee Type & Documents Needed: Property Owner(s) Purchaser Lessee Viable? i� Viable? Viable? Deed Purchase Agmt Lease Not Subdivided: Deed Subdivision: Common Area Deed Paperwork New Permit #Z: ID Existing Permit #: 5;,� Ql p f1W Expriation Date 3: 2-01 FlOffsite to SW8: Lot is in Master Permit? ETE Cert on File? ElHOA Developer Viable? Viable? Election Minutes Application Fee: [:]$505 (within 6mo) Check#(s): �Supplement2 (1 new form or for alder forms: 1 original perSCM) �O&M2 Soils Report (Infil or PP) MCalcuiations (signed/sealed) Deed Restrictions, if subdivided Project Narrative FTSGS Map (or on file?) Subject to SA?: Y / N Subject to ORW?: Plans {2 Sets) MPE Certification Electronic Copies Easements, Recorded (2017 Rutes) NOTES: 'Enter RIMS Acknowledged Date on this Sheet 2For New Projects -Enter New Permit # on Supplements & Deed Restictian Templates. 3If w/in 6 months and they are requesting a mod, STOP. Needs a renewal first. EMAILED ENGINEER DATE: REVIEWER NAME: --L) P1 FiNo Fee Y / N Comments: &/ekl lok2Mfr PFEPM 617Sr/- 661/090P)15 G:wQ\\\Reference Library\Pr❑[edLires\Checklists\Com PIetemess Review Chetkiist_2020 0131 OFFICE USE ONLY Date Received Fee Paid Permit Number 1— -a ¢ct)4ct 1 .5w'?ol0 zv HW State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): Commanding General, Marine Corps. Base, Camp Lejeune 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Commander Lawrence Readal, Public Works Officer 3. Mailing Address for person listed in item 2 above: Commanding General, Marine Corps. Base, 1005 Michael Road City: Camp Lejeune state. NC zip: 28547-2521 Telephone Number: ( 910 ) 451-2581 4. Project Name (subdivision, facility. or establishment name - should be consistent with project name on plans, specifications. letters, operation and maintenance agreements, etc.): Tarawa Terrace Phase III Housing Replacement 5. Location of Project (street address): Tarawa Terrace city: Camp Lejeune county: Onslow 6. Directions to project (from nearest major intersection): From Hwy. 24, enter Tarawa Terrace I entrance and proceed on Tarawa Blvd. to site. 7. Latitude: 34 ° 44' Longitude: 77 ° 22' 8. Contact person who can answer questions about the project: Name: Wend Haustveit/David Powell Telephone Number: II. PERMIT INFORMATION: 1. Specify whether project is (check one): New Renewal of project 08 ) 344-1180 X Modification W Form SWW-101 Version 3.99 Page 1 of 4 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number SW8010420 N62470-97-C-7111 and its issue date (if known) Au . 23 2003 3. Specify the type of project (check one): Low Density X High Density Redevelop General Permit X Other 4. Additional Project Requirements (check applicable blanks): �CAMA Major X Sedimentation/Erosion Control _404/401 Permit _NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at I-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Wet ponds will be used to capture the runoff form the 1 -inch storm in order to settle — out suspended solids. 2. Stormwater runoff from this project drains to the White Oak River basin. 3. Total Project Area: acres 4. Project Built Upon Area: % 5. How many drainage areas does the project have? 2 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. Phase 1 D Pond Phase III Pond :Basin Information Drainage Area�1 Drainage�Area 2. . Receiving Stream Name NORTHEAST CREEK NORTHEAST CREEK Receiving Stream Class SC HQW NSW SC HQW NSW Drainage Area 6,596,201 SF 1,878,243 SF Existing Impervious` Area — — Proposed Impervious'Area 3,173,112 SF 755,001 SF % Impervious* Area (total) 48% 40% Impervious'Surface Area:. Drainage*ea 1 .: Drainage Aiea'2, On -site Buildings 372,097 SF 135,660 SF On -site Streets 443,259 SF 196,623 SF On -site Parking 160,246 SF 90,895 SF On -site Sidewalks 121,885 SF 46,658 SF Other on -site 264,099 SF 160,782 SF Off -site 1,811,536 SF 124,383 SF Total: 3,173,112 SF Total: 755,001 SF Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Farm SWU-101 Version 3.99 Page 2 of 4 How was the off -site impervious area listed above derived? From topographic map and previous_ construction plans. IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment. 1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. 2. No more than _ square feet of any lot shall be covered by structures or impervious materials. Impervious materials Include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood decking or the water surface of swimming pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. 4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction. 5. AlI permitted runoff from outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Farm SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of 4 Vr. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initial" • Original and one copy of the Stormwater Management Permit Application Form • One copy of the applicable Supplement Form(s) for each BMP • Permit application processing fee of442&(payable to NCDENR) $4000.00 • Detailed narrative description of stormwater treatment/management • Two copies of plans and specifications. including: - Development/Project name - Engineer and firm - Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VIL AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Designated agent (individual or firm): David G. Powell, RiveRidge Engineering Go. Mailing Address: 405 W. Myrtle St. City: Boise State: ID zip: 83702 Phone: ( 208 ) 344-1180 VIII. APPLICANTS CERTIFICATION 1, (print or type name o n ' t' n General In certify that the info iation I -c �! on this pe that the project will co n mnfonrk and protective cov will orded, and NCAC 2H .1000. i Fax (_ 208 L 344-1182 ton form is, to the best of my knowledge, correct and approved plans, that the required deed restrictions )osed project complies with the requirements of 15A Date: Y Form SWU-10l Version 3.99 Page 4 of 4 Permit No. 5A) �TU1 Q 4 ZO 1� 019 (to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. I. PROJECT INFORMATION Project Name: Tarawa Terrace Phase Ili - Housing Replacement Contact Person: Wendy Haustveit/David Powell Phone Number: (.208) 344-1180 For projects with multiple basins, specify which basin this worksheet applies to: Phase III Pond elevations Basin Bottom Elevation 6.0 ft. (floor of the basin) Permanent Pool Elevation 11.4 ft. (elevation of the orifice) Temporary Pool Elevation 12.6 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 61,451 sq. ft. (water surface area at the orifice elevation) Drainage Area 43.12 ac. (on -site and off -site drainage to the basin) Impervious Area 17.33 ac. (on -site and off -site drainage to the basin) volumes Permanent Pool Volume 242,368 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 76,170 cu. ft. (volume detained above the permanent pool) Forebay Volume 48,599 cu. ft. (approximately 20% of total volume) Other parameters SA/DA1 2•8 (surface area to drainage area ratio from DWQ table) Diameter of Orifice 4 in. (2 to 5 day temporary pool draw -down required) Design Rainfall 1 in. Design TSS Removal 2 90 % (minimum 85% required) Form SWU-102 Rev 3.99 Page 1 of 4 Footnotes: i When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non- standard table entries. 2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85 % TSS removal and 90% TSS removal. II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below. If a requirement has not been met, attach justification. Applicants Initials t_o// a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). wt( b. The forebay volume is approximately equal to 20% of the basin volume. _ L o L f c. .The temporary pool controls runoff from the design storm event. c J� d. The temporary pool draws down in 2 to 5 days. N1A e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) f. The basin length to width ratio is greater than 3:1. g. The basin side slopes above the permanent pool are no steeper than 3:1. h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). j. N/A k. N/A Vegetative cover above the permanent pool elevation is specified. A trash rack or similar device is provided for both the overflow and orifice. &011 n-�� '''efe A recorded drainage easement is provided for each basin including access to nearest rightP(-,rv.6 of -way. 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. L 041 m. A mechanism is specified which will drain the basin for maintenance or an emergency. L,J%!Ire�r0�,� �tga'f ILvrzer�crl cc� c� ry+ cl_-aA-d Comic o III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one) Kdoes 0 does not incorporate a vegetated filter at the outlet. This system (check one) 0 does A does not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3.99 Page 2 of 4 Maintenance activities shall be performed as follows: 1. After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. 4M- When the permanent pool depth reads —, ffe�et in the main pond, the sediment shall be removed. When the permanent pool depth reads 7� feet in the forebay, the sediment shall be removed. Sediment RAoval El. 7.25 Bottom Elevation 6.0-----r2 FORE$AY BASIN DIAGRAM {fill in the blanks} Permanent Pool Elevation 1 1.0 Sediment Removal Elevation 7.25 ---------------------------------- 6 Bottom Elevation 6.0 MAIN POND -------1-,-,-% -- 25% 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-102. Rev 3.99 Page 3 of 4 7. All components of the wet detention basin system shall be maintained in good working order. I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name:_ F-E tyC,G- 7-t L- Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 'a Notary Public for the S ate o G� L County of , do hereby certify that personally appeared before me this S101 day of /�� , .-Z-1 i , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, za6 SEAL My commission expires o�3 0� ';1 0 U.1" Form SWU-102 Rev 3.99 Page 4 of 4 • Permit No. 56U 30l U ¢ zo (io by provided.hv 1)IYO . State of North Carotin D4artment of Fnvironment and Natural Resources Divislon of Water Quality- STORMWATER MANAGRMFNT PERMIT APPLICATION FORM WET -DETENTION BASINSUPPLENIENT. " This faint may be photocoFied.tar use as an original !]w(ZStarmwater Mzinngetrient Plan Reviaw: A complete stormwater rnatiagemerit plan submittal includes an application form, a wet detention. ,basin supplement for each basin, design calculations, and. plans and specifications showing all basin ,and outlet structure details. 1. PROJECT INFORMATION Project Name: CAMP LETEU E PHASE 1D POND Contact Person: laP BRIGGS _.. 1'hnne Number: (ZOa } 344.9700 For projects with multiple basins, specify which basin this worksheet applies_to: R2DJ I fl) elevations Basin Bottom Elevation 0. p � w fl. (11(mr of the.hasin)� Permanent Poo I Elevation 5. Q ft. (elevation of the orifice) Temporary Pool Flevntion (�,.Q W ft. (elevation of the discharge srrtrrnire overflow) areas PermHne~nt Pool Surface Area 1 A6r,7n sq. ft. Drainage Area 173.82 ac. Impervious Area 74.74 ac. (watersurface area at tile orifce elevation) (on -site and off -site drainage to the basin) (on -site and of -site drainage to the basin) volumes Permanent Pool Volume 757,358 cu. ft. (combined volume of main,basin.and forebay) Temporary Pool Volume u; ft. (volume detained above.the.perinanem pool) I'orebay Volume 149,854 -cu, ft. (approximately 20% of total uolumeq Other parameters S1VDA' Diameter of Orifice Design Rainfall Design TSS Removal Z >•orm SWU.102 ttev 3,99 2,471 X 5 in. 1.0 in. U.3 % (surface area, to drainage area ratiofrom.DIYQ table) Q to,5 day:tentporary pool draw -down required) (minimum 85% required) Pnge 16f 4 Footnotes: ' When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon the actual impervious `%, and permanent pool depth. Linear interpolation should be emploved to determine the correct value for non- standard table entries. 2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS'removal. The NCDENR BM P manual provides design tables for both 95"1" TSS removal and 901;%TSS removal. 11. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below. if a requirement has not been met, attach ,justification. Applicants Initials X 108 a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). X bB b. The forebay volume is approximately equal to 20% of the basin volume. X c. The temporary pool controls runoff from the design storm event. X d. The temporary pool draws down in 2 to 5 days. e. if required, a 30-foot vegetative filter is provided at the outlet (include non -erosive now calculations) AB f. The basin length to width ratio is greater than 3: 1. X The basin side slopes above the pennanent pool are no steeper than 3:1. x _ bB h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). sr he i. Vegetative cover above the permanent pool elevation is specified. X P8 j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. X D13 m. A mechanism is specified which will drain the basin for maintenance or an emergency. III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one) 0 does does not incorporate a vegetated filter at the outlet. This system (check one) 0 does )Kdoes not incorporate pretreatment other than a forebay. Form SWU-102 Rev 3.99 Page 2 of 4 Maintenance activities shall b4perfortned as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper Functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 750/0 oFthe original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate ��ccumulated sediments. When the permanent pool depth reads -4--t5 feet in the main pond, the sediment shall be removed. 3"16 When the permanent pool depth reads feet in the forebav, the sediment shall be removed. BASIN DIAGRAM (fill In the hlunkv) Permanent Pool Elevation 15_ 0 Sediment Removal El. /• 2 175 Sediment Removal Elevation /•25 75`% Bottom El anon d. A '% --------------------------------------------- ------- Bottom Elevation d. 0 25% FOREBAY MAIN POND Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. If the basin must be drained for an emergency or to perform maintenance, the Flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-l02 Rev 3.99 Page 3 of 7. All components of the wet detention basin system shall be maintained in good working order. I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: ST-C✓En/ /f, n5 , V/S Title: /C W,04 -5 DFFiL�i� Address: /DoS/''H4EL /t'DAd Ci��Ji° GEJ�!//t/�, /VG 28Sh'� Phone: '710 — yS! — 2 316 X 2 Signature: ZZZ�110� Date: 22 AM le DZ Note: The legally responsible party should not be a homeowners association unless more than 50'%, of the lots have been sold and a resident of the subdivision has been named the president. I, a Notary Public for the State of r LzslG�� County of , do hereby certify that personally appeared before me this o�-"/day of and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seat, SEAL My commission expires 0 a Form SWU-102 Rev 3.99 Page 4 of 4 DETENTION POND ANALYSIS FILENAME- G-\DATA\WPDATA\WQS\POND1010420-D PR0J'EQT #: SW8 01 0420-D REVIEWER- L. Lewis PROJECT.NAME: Tarawa Terrace Overall Pond DATE- 15-Aug-02 Receiving Stream: Northeast Croek Class: SC HQW NSW Drainage Basin: White Oak Index No. 19-16-(3.5) Site Area 189.90 acres Drainage Area Jr.; 57; 0000.'I square feet Area in Acres 173.82 acres IMPERVIOUS AREAS Rational C Acres Buildings 1413086.00 square feet 32.44 Streets 9766155.00 square feet 22.42 Parking 5793148,00 square feet 13.30 SW 120661.00 square feet 2.77 Other 165964.00 square feet 3.81 square feet Total 74.74 TOTAL :��;3255674 square feet Rational Cc= 0.11 SURFACE AREA CALCULATION % IMPERVIOUS 43,00% Des. Depth 5 TSS: 85 SA/DA Ratio 2.28% Req. SA 172626 sf Prov. SA 'i8687Osf VOLUME CALCULATION * place a "l " in the box if Rational is used Rational ?* Des. Storm Rv= Bottom Perm. Pool Design Pool Volume prov @6.4 Req. Volume Storage met at ORIFICE CALCULATION Avg. Head = Flow Q2, cfs Flow Q5, cfs No. of Orifices Diameter, inches Drawdown = Perm. Pool Volume= 757358 Req. Forebay Volume= 151471,6 Provided Volume= 149854.00 Percent= Al 4198 Elev Area Inc. Vol Acc. Vol 5 186870 0 0 6.00 201145 194008 194008.00 7.00 218468 209807 403814.0 Q2 Area = 61.82 sq. in. Q5 Area = 24.73 sq. in. Orifice Area 39.27 sq. in. Q= 1.014 cfs in x F7T COMMENTS Surface Area, Volume and Orifice are within Design Guidelines. in DETENTION POND ANALYSIS FILENAME- G:IDATAIWPDATAIWQSIPOND1010420-D PROJECT #: SW8 010420-D REVIEWER: L. Lewis PROJECT NAME: Tarawa Terrace Overall Pond DATE: 15-Aug-02 Receiving Stream: Northeast Creek Class: SC HQW NSW Drainage Basin: White Oak Index No. 19-16-(3.5) Site Area 189.90 acres Drainage Area 7571Q0 Q( square feet Area in AcreE 173.82 acres IMPERVIOUS AREAS Rational C Acres Buildings 1413086.00 square feet 32.44 Streets 976615.00 square feet 22.42 Parking 579348.00 square feet 13.30 SW 120661.00 square feet 2.77 Other 165964,00 square feet 3.81 square feet Total 74.74 TOTAL 325674.pp.' square feet Rational Cc= 0.11 SURFACE AREA CALCULATION % IMPERVIOUS 43.00% Des. Depth 5 TSS: 85 SAIDA Ratio 2.28% Req, SA 172626 sf Prov. SA ;.186870�� sf VOLUME CALCULATION * place a "1" in the box if Rational is used Rational ?* Des. Storm Rv= Bottom Perm. Pool Design Pool Volume prov @6.4 Req. Volume Storage met at ORIFICE CALCULATION Avg. Head = Flow Q2, cfs Flow Q5, cfs No. of Orifices Diameter, inches Drawdown = FOREBAY Perm. Pool Volume= Req. Forebay Volume= Provided Volume= Percent= Elev Area 757358 151471.E 149854.00 Inc. Vol Acc. Vol 5 186870 0 0 6.00 201145 194008 194008.00 7.00 218468 209807 403814.0 0.55 ft Q2 Area = 1.596 cfs Q5 Area = 0.638 cfs Orifice Area 77771 7 Q= 7QOweirHxW in 3 days COMMENTS Surface Area and Orifice are within Design Guidelines. `1 t R 64.10 sq. in, 25.64 sq. in. 38.48 sq. in, 0.958 cfs x ._: in BRIGGS ENGINEERING, Inc. ENGINEERS 1 PLANNERS 1 SURVEYORS August 15, 2002 1800 West Overland Road Boise, Idaho 83705-3142 Voice: (208) 344-9700 Fax: (208) 345-2950 deanb@briggs-engineering.com Ms. Linda Lewis North Carolina Department of Environmental Health and Natural Resources [NCDENR] Water Quality Section - Stormwater 127 Cardinal Dr. Ext. Wilmington, North Carolina 28405 RECEIVED Re: DWQ Stormwater Project Number: SW8 010420 Tarawa Terrace Housing Replacement AUG 18 2002 DWQ Dear Ms. Lewis: PROS # Per your email we are submitting the following items for your use. • (2) Copies of the 11 x1 7 plans submitted in ,dune. + (1) Copy of the revised Engineering Calculations Cover Sheet, stamped. Thank you again for your attention to this project. Sincerely, BRIGGS ENGINEERING, Inc. Dean Briggs, P.E. Enclosures Copies: Lynn Standish, Gile & Assoc. Rick Marshall, Hunt Building Co. 1007 - Lejeune 08/15/02 April 10, 2002 Commander S.R. Scanlan, CEC, USN Public Works Officer, Marine Corps Base 1005 Michael Road Camp Lejeune, NC 28542 Subject: Tarawa Terrace Stormwater Project No. S W 8 010420 Onslow County Dear Cdr. Scanlan: The Division of Water Quality is in receipt of your letter of March 27, 2002. Staff met with Tony Sholar on March 4, 2002, where a modification to the current permitted stormwater facilities was proposed. This modification was needed in'order to provide more space around the new buildings that was currently being taken up by the dry detention facilities. As I understand it, the modification involves the replacement of the previously permitted multiple dry detention basins to a single wet detention pond (known as the Phase I D pond) which will treat the runoff from the entire Tarawa Terrace development starting with Phase 1 B. Concurrently, a modification to replace the dry detention basins in Phase 1 A with a separate wet pond (known as the Phase I A pond) is also proposed. It is my understanding that the proposed impervious areas under Phase I B will commence construction without stormwater treatment at this time, but will be treated in the Phase 1 D pond to be constructed at a later date. The contract for the Phase 1 D Pond is expected to be awarded in the fourth quarter of 2002. After the award, an estimated 60-90 days for equipment mobilization and pond site demolition may elapse before actual pond construction would begin. The Phase 1 A pond will be modified upon receipt of the modified permit. The Division of Water Quality accepts your proposal, subject to the following conditions: The Phase 1 D Pond must be constructed within 4 months of awarding the contract, and the contract must be awarded by December, 2002. This agreement must be re -negotiated if this timeframe is not met. Unforseen circumstances will be considered, however, the Division will require that every effort be made to minimize the amount of time that stormwater runoff goes untreated at this site. 2. The proposed Phase I D Pond must meet the design guidelines established in 15A NCAC 21-I.1000. A cursory review of the application submitted on March 25, 2002, indicated that short-circuiting is a potential problem in the Phase IA pond due to the location of one of the forebays. The forebay closest to the outlet structure must either be eliminated or relocated to provide the necessary 3:1 L:W flow path. BRIGGS ENGINEERING. Inc. ENGINEERS/ PLANNERS/ SURVEYORS RECEIVED JUN 2 6 2002 June 25, 2002 vwQ ROD PROM # 5W Il 8 of 0420 OD 1800 West Overland Road Boise, Idaho 83705-3142 Voice: (208) 344-9700 Fax: (208) 345-2950 deanb@briggs-engineering.com Ms. Linda Lewis North Carolina Department of Environmental Health and Natural Resources jNCDENRJ Water Quality Section - Stormwater 127 Cardinal Dr. Ext. Wilmington, North Carolina 28405 (910) 395-3900 Re: DWQ Stormwater Project Number: SW8010420 Modification Tarawa Terrace Housing Replacement, Phases 1A, 1B, 1C & 1D N62470-97-C7111 Dear Ms. Lewis: The purpose of this letter is address each of the comments on your letter dated May 30, 2002. In an effort you with additional information we have addressed each comment below and have attached (2) modified copies of submitted information. Due to the sensitive nature of this project schedule, I would be pleased to come to your office and go over the project at your convenience. We look forward to your review and comments. Following is a synopsis of the responses to your comments in the order of your letter. 1. There are no wetland issues. Notes indicating no wetlands are on sheets: C-112, Demolition Note 9 [Phases 1A & 1 B] & C-105-C, Demolition Note 7 [Phase 1 C]. Phase 1 D Sheets C-101-D & C-102-D indicate the location of the wetlands as surveyed by Parker and Associates, November 2001. All work is outside of the wetlands delineation with the modification of the outlet structure. 2. General building dimensions and perimeter areas have been added to the legend on sheets C-101 [Phases 1A & 1B]& C-101-C [Phase 1C]. 3. Base Facilities Engineering has provided a planting schedule for the "Wetlands Species Planting". The planting species type and spacing is noted on sheet C-502-D, Note 4.A.. The location of the planting is identified on sheets C-101-D & C-102-D from elevation 5 to 3.33 on the 6:1 slopes. 4. Enclosed is the modified application page 2 [SWU-101, v3.99] and pages 1 and 2 of the "Wet Detention Basin Supplement" form [SWU-102, v3.99], with modification made as requested. 5. A vegetated filter has been added to the plans downstream of the outlet on sheet C-102-D. Details of the filter have been added to sheet C-502-D, #4 & #5. 1007 - Lejeune 06/25/02 .1. BRIGGS ENGINEERING. Inc. — 1800 West Overland Road, Boise, Idaho 83705 6. Item Il.e. "Wet Detention Basin Supplement" has been initialed and the NA X'd out. 7. Calculations determining the non -erosive velocity in the vegetated filter are attached. 8. The temporary pool volume has been modified to an elevation of 6.4. 9. The clay liner has been removed at the request of the Base Civil Engineer. 10. Sediment removal elevation is acknowledged to be 1.25, which is 1,25 feet above the pond bottom at elevation of 0 and 3.75 feet below the permanent pool elevation of 5.00. Sincerely, BRIG. ENGINEERING, Inc. Dean Briggs, P.E. Enclosures: Revised Application Sheets: SWU-101, page 2; SWU-102, pages 1 & 2 Revised and Amended Calculations Modified Drawings: C-101, C-506, C-101-C, C101-D, C102-D, & C502-D Enclosures Copies: Lynn Standish, Gile & Assoc. Rick Hunt, Hunt Building Co. McKenney Hartman, ROICC 1007 - Lejuene PA 06/25/02 Cdr. Steve Scanlan April 10, 2002 Stormwater Permit No. SW8 010420 If you have any questions, please do not hesitate to call me at (910) 395-3900. Sincerely, Linda Lewis Environmental Engineer RSSlarl: S:IWQSISTORMWAIILETTERS1010420.APR cc: Tony Sholar Linda Lewis WET DETENTION POND ANALYSIS FILE NAME: G:IDATAIWPDATAIWQSIPOND1010420-IIl.dec04.WK PROJECT #: SW8 010420-Ill.dec04 REVIEWER: L. Lewis New Phase III Pond PROJECT NAME: Tarawa Terrace Housing I, II & III DATE: 16-Dec-04 Receiving Stream: Northeast Creek Class: SC HQW NSW Drainage Basin: White Oak Index No. WOK02 19-16-(3.5) Site Area acres Drainage Area square feet Area in Acres 43.12 IMPERVIOUS AREAS Rational C Building 135660.00 square feet Street 196623.00 square feet Parking 90895.00 square feet SW 46658.00 square feet Other 160782.00 square feet Offsite 124383.00 square feet TOTAL i 55f301lQ square feet Rational Cc= 0.12 SURFACE AREA CALCULATION % IMPERVIOUS 40.20% Des. Depth 5 TSS: 90 SAIDA Ratio 2.81 % Req. SA 52850 sf Prov. SA':45':1': sf VOLUME CALCULATION * place a "1" in the box if Rational is used Req. Volume 6451 ';' cf Vol. Prov. at DP _ .:'..... 7:51.7.2<I cf ORIFICE CALCULATION Avg. Head = Flow Q2, cfs Flow Q5, cfs No. of Orifices Diameter, inches Drawdown = 0.52 ft 0.373 cfs 0.149 cfs 400: weir HxW 2 5 ; days FOREBAY Perm. Pool Volume= 223153 Req. Forebay Volume= 44630.6 Provided Volume= 39944.00 Percent= 17 9°0 Elevation 11.40 12.60 Area 61451.00 65502.00 Inc. Vol. 76171.80 Acc. Vol. 0.00 76171.80 Q2 Area = 15.52 sq. inches Q5 Area = 6.21 sq. inches Orifice Area 12.57 sq. inches Q= 0.302 cfs in x >.. in Surface Area @DP = 65502 sq. ft. Falling Head Drawdown = 3.8 days COMMENTS Surface Area , Volume and Orifice are within Design Guidelines Engineer used wrong formula for orifice area. Orifice is too large. 1 � \ C C O M t $ 0 0 2 LL . � _ n / / e m m 0 c o U)' w B $ K d § k R 0 2 R 2 $ § k Lq k k k / CD - k < LC) o � _ 0) / w 0 \ « � 0 o I-- co o It 0 7 W w E w C4 o L a 0 o r- f % co S o k q \ C k co \ �C C%j 0 � 00 UD 2 % q 3 It2 R 6 q 9 -t R 2 < q % m 2 R % 7 # od < y \J p m Z _j O > � O 2 \ LU a 7 d o ¥ < o o a � � « 0 R q 2 \ a 0 0 >< m 0 o a E LU d 0 0 0 a U- LLJ LU > 0 0 400 \ 2 \ k� k L $ / _j o \ © - >o §_\ k \ w�G % \. �d LL . Z . .. � It / k ® C 2 Li D o 0 > F- 0 0 a $ w / w