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SW8010420_HISTORICAL FILE_20020823
STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 d I r--)42.b DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE Z oo2 D$ Z3 YYYYMMDD �0� W A rFq �O � r P -- Michael F. Easley, Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Alan W. Klimek, P.E., Director Division of Water Quality Wilmington Regional Office August 23, 2002 Commander S. R. Scanlan, Public Works Officer Commanding General, Marine Corps Base 1005 Michael Road Camp Leicune, NC 28547-2521 Subject: PermitNo. SW8 010420Modification Tarawa Terrace'I Housing N62470-97-C-7111 - - - - - High Density Stormwater Project----- - - --- -- -- -Onslow County - - - -- - -- Dear Commander Scanlan: The Wilmington Regional Office received a complete modification to the Stormwater Management Permit for Tarawa Terrace I Housing on August 18, 2002. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 010420 dated August 23, 2002, for the construction of Tarawa Terrace I Housing. This permit shall be effective from the date of issuance until August 23, 2012, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the storm water, management system will result in future compliance problems. If any parts, requirements, or limitations contained in this pemut 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. If you have any questions, or need additional information concerning this matte:, please contact Linda Lewis, or me at (910) 395-3900, Sincerely, - R1ck.Shiv1-r Water Quality Regional Supervisor RSS/arl: S:IWQSISTORMWATIPERMIT1010420.AUG CC'. Dean Briggs,-P.E. Mitchell Parker, Onslow County. Inspections Linda Lewis Wilmington Regional Office Central Files NCI)Eha N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 (910) 395-3900 Fax (910) 350-2004 Customer Service 800-623-7748 State Stormwater Management Systems Permit No. SWS 010420 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 Cdr. S.R. Scanlan, Public Works Officer, Marine Corps Base Tarawa Terrace I Housing Onslow County FOR THE construction, operation and maintenance of 2 wet detention ponds in compliance with the provisions of 15A NCAC 2H. 1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this Permit. This permit shall be effective from -the date -of issuance until August 23, 2012 and shall be subject to the following specified conditions and Iimitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described on page 3 of this permit, the Project Data Sheet. The stormwater controls have been designed to handle the runoff from 304,048 ftz and 3,255,674 ftz of built -upon area. - 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 4. Each drainage area will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plants. 5. Pond D must be operated with a 30' vegetated filter. 6. 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. 7. All conditions regarding Pond D as outlined in the April 10,.2002, letter must be followed. 2 State Stornwater Management Systems Permit No. SW 8 010420 DIVISION OF WATER QUALITY PROJECT DESIGN DATA SHEET Project Name: Tarawa Terrace I Housing (N62470-97-C-7111) Permit Number: __ SW8 010420 Modification L ri ocaon. _ _ T ., _ . _ _. _ _. ns ow ounty-- - - Applicant: Commander S. R. Scanlan Public Works Officer Mailing Address: Marine Corps Base 1005 Michael Road Camp Lejeune, NC 28547-2521 Application Date: - August 18, 2002 Name of Receiving Stream/Index #: White .Oak/ Northeast Creek / 19216-(3.-5) Classification of Water Body- "SC HQW NSW" Pond Number: 1A D Drainage Area, acres: '16.08 173.82 Offsite.Area entering Ponds, ftz: none, per.Engineer, both ponds Total Impervious Surfaces, ftz: '304-,048 3,255,674 Pond Design Depth, feet: .5 5 Permanent Pool Elevation, FMSL: 20 5 Required'I" Storage Volume, ft3: -25,722 275,723 Provided Storage Volume, $': 200,704 277,930 Temporary Storage Elevation, FMSL: 21 6.4 Controlling Orifice: 2.5"y pipe 7"cp pipe Time to draw down, days: 2.7 3.3 3 State Stormwater Management Systems Permit No. SW8 010420 11. SCHEDULE OF COMPLLANCE _ - 1. The stormwater managdmerit system shall be constructed in it's 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 side slopes. d. Immediate -repair of eroded areas. e. Maintenance of side slopes in accordance with approved plans.and specifications. f.- Debris removal and unclogging of outlet structures, orifice devices, swales, catch basins.and piping. g. Access to the outlet structures must be available at all times. h. The grassed swales will be kept grassed with no erosion, free of sediment and trash. 4. Records of maintenance activities must be kept and made -available upon request to _ authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work -and what actions were taken. ..— 5. Decorative spray fountains will not be. allowed in any stormwater treatment. system. 6. The facilities shall be constructed as shown on.the approved plans. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 7. Upon completion of construction, prior to issuance of a Certificate of Occupancy,.and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the.system installed certifying that the permitted facility has been instalIed'in accordance with this permit, the approved plans and specifications,.and other supporting documentation. Any deviations from -the approved plans and specifications must be -noted on the Certification. 8. If the stormwater system was used as an Erosion Control device; it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 9. 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 the approved plans, regardless of size. b. :Project name change. C. Transfer of ownership. d. Redesign or addition to the approved -amount of built -upon area. e. Further subdivision, acquisition, or sale of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 4 State Stormwater Management Systems Permit No. SW8 010420 10. A copy of the approved plans and specifications shall be maintained on file by -the Permittee for a minimum of ten years from the date of the completion of construction. 11. The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -upon area.. 12. The Director may notify the permittee when the permitted site does not meet one or more - -- - - - of the minimum -requirements of -the permit: Within -the time frame specified in the -notice. the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum_ requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. 13. The permittee shall notify the Division of any.name, ownership or mailing address changes within 30 days. I11. GENERAL CONDITIONS 1. This permit is not transferable. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee,.a formal, permit request must be submitted to the Division of Water Quality accompanied by an application fee, documentation from the parties involved, and other supporting materials as may be appropriate. The approval of this request will be considered on its merits and may or may not be approved. 2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. 3. The issuance ofIhis 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. 5. The permittee grants DENR Staff permission to enter the property for the purpose of inspecting all components of the permitted stormwater management. facility. 6. The permit -may be modified, revoked and reissued or terminated for cause. The filing of .a request for a -permit -modification, revocation and reissuance or termination does not stay.any.permit condition. 7. Unless specified elsewhere, permanent seeding requirements. for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning.and Design Manual. Permit issued -this the.23rd day ofAugust,.2002. NORTH CAROLINA.ENVIRONMENTAL MANAGEMENT COMMISSION Alan W. Klimek, P.E., Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW8 010420 E State Stormwater Management Systems Permit No. SW8 010420 Tarawa Terrace I Housing (N62470-97-C-7111) Stormwater Permit No. SW8 010420 Modification Onslow County Designer's Certification as a duly registered - in the State of North Carolina, having been authorized to observe (periodically/weekly/full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL i State Stormwater Management Systems Permit No. SW8 010420 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. The outlet/bypass structure elevations are per the approved plan. S. The outlet structure is located per the approved plans. 6. - Trash -rack - -is provided on the-outlet/bypass structure.- 7. All slopes are grassed with permanent vegetation. S. Vegetated slopes are no steeper than 3:1. 9. The inlets are located per the approved plans and'do not cause short-circuiting of the system. 10. The permitted amounts of surface area and/or volume have been provided. 11. Required drawdown devices are correctly sized per the approved plans. 12. All required design depths are provided. 13. All required parts of the system are provided, such as a vegetated shelf, and a forebay. 14. The overall dimensions of the system, as shown on the approved plans, are provided. cc: NCDENR-DWQ Regional Office Mitchell Parker, Onslow County'Building Inspector 7 .. Two Phase Design/Build Replacement of Family Housing Units Tarawa Terrace Housing, marine Corps Base Camp Lejeune, North Carolina CAMP LEJEUNE, TARAWA TERRACE ? STORM WATER CALCULATIONS [MODIFICATION] RECEIV""" Adiu- 18 2002 Pxoa # S ? 0/0 �ZO /�- o0 8/15/2002 Stormwater Management Plan 9-13 m Two Phase Design/Build Replacement of Family Housing Units Tarawa Terrace Housing, marine Corps Base Camp Lejeune, North Carolina Table of Contents: 1) SITE DESCRIPTION a) Nature and Purpose of Construction Activity b) Intended Sequence of Major Activities c) Estimates of Area to be Disturbed d) Description of Existing Soil Types. e) Existing Vegetation f) Receiving Waters g) Site Map 2) EROSION AND SEDIMENT CONTROL a) Stabilization Practices: b) Structural Practices 3) STORMWATER MANAGEMENT PLAN -- Redevelopment a) Redevelopment Justification b) Stormwater Management Summary 4) ATTACHMENTS a) Storm Water Management Permit Application Form b) Extended Wet Detention Basin Supplement — Basin #1A c) Storm Drainage Plans d) Storm Drainage Calculations [on plans) e) Erosion and Sediment Control Plans 11%uu1 \k GA SEAL /g "`+..:w qN W W 3/19/2002 StormwOfiea%;ement Plan 2 - 13 Two Phase Design/Build Replacement of Family Housing Units Tarawa Terrace Housing, marine Corps Base Camp Lejeune, North Carolina 1J Site Description a) Nature and purpose of construction activity -- to provide 234 new family housing units at Tarawa Terrace I, Camp Lejeune, North Carolina (TTI). The work includes the design and construction of new housing, demolition of existing buildings, site improvements, and utility services. i) The Construction of this project will be accomplished in two phases. Phase I includes the demolition of existing housing and the construction of 234 new housing units. Phase II includes the demolition of existing housing and the construction of a new storm drainage facility for the balance of TTI. This erosion and sedimentation control plan and Stormwater management plan covers the construction both phases of the project. b) Intended sequence of major activities — major construction activities will occur approximately in the following order. i) Site Clearing and Demolition Areas to be Rebuilt (1A, 1 B, 1 C) ii) Earthwork and Temporary Stabilization Areas to be Rebuilt (1A, 1B, 1C) iii) New Construction and Permanent Stabilization Areas to be Rebuilt (1A, 1 B, 1 C) iv) Building Construction in Areas to be Rebuilt (1 A, 1 B, 1 C) v) Earthwork and Temporary Soil Stabilization, Future Construction (1 D) vi) Infrastructure & Storm Water Facilities Construction and Permanent Soil Stabilization, Future Construction (1 D) vii) Site Clearing and Demolition, Future Construction (1 D) viii)Earthwork and Temporary Soil Stabilization, Future Construction (1 D) ix) Infrastructure & Storm Water Facilities Construction and Permanent Soil Stabilization, Future Construction (1 D) c) Estimated area to be disturbed - 43 acres 3/19/2002 Stormwater Management Plan 3 - 13 Two Phase Design/Build Replacement of Family Housing Units Tarawa Terrace Housing, marine Corps Base Camp Lejeune, North Carolina d) Description of existing soils types — A soils investigation was performed to identify the existing soil conditions at the site. Soil samples were classified according to the "Unified Classification System." The predominant soil types consist of clean sand (SP), slightly silty sand (SP-SM), clayey sand (SC) and silty sand (SM), with minor amounts of fat clay (CH) and sandy silt (MH). Groundwater was observed in test borings and hand augers at a depth of approximately 5.0 to 18.5 feet. e) Existing vegetation — The existing site is developed with housing units, streets and parking areas. There are several groups of small trees and lawn areas surrounding the building units. The demolition phase of the project consists mainly of removing the existing structures without significant land alteration or vegetation removal. f) Receiving waters — Stormwater runoff from the Tarawa Terrace development is collected and routed to the adjacent Northeast Creek located south and east of the existing development. There is a large natural, vegetated buffer that separates Tarawa Terrace from the creek that will remain undisturbed by this project. g) Site map- See erosion and sedimentation control plans. 2) Erosion and Sediment Control a) Stabilization practices — all denuded areas that will be dormant for extended periods of time shall be seeded with fast germinating temporary vegetation immediately following grading. Selection of seed mixture will depend on the time of year when it is applied. See the North Carolina Erosion and Sediment Control Design Manual for selection of the seed mixture. b) Erosion and Sediment Control - Structural Practices i) Silt Fence — silt fence sediment barriers will be installed down -slope of areas with minimal grades to filter sediment -laden runoff from sheet flow as indicated on the plans. ii) Inlet Protection — all storm sewer inlets shall be protected during construction. Sediment laden water shall be properly filtered before entering the storm sewer system. iii) Stabilized Construction Entrance — an approved construction entrance will be constructed anywhere construction traffic is allowed to leave the site. iv) Maintenance — the contractor is required to install, maintain, and repair erosion control measures as needed to prevent sediment from leaving the site. 3/19/2002 Stormwater Management Plan 4 - 13 Two Phase Design/Build Replacement of Family Housing Units Tarawa Terrace Housing, marine Corps Base Camp Lejeune, North Carolina ,33) Storm Water Management Plan — Redevelopment a) Redevelopment Justification — In reviewing the project with a local engineer, John Parker and the NCDENR the project seem to fit in the category of 'redevelopment'. This allows NCDENR some latitude in applying the requirements. The basis of the design is the reconstruction of the living units in an area that is presently developed for the same purpose. This project is to upgrade the units to current living standards while leaving as much of the infrastructure intact. b) Storm Water Management Summary — The design of the Stormwater Management System has been done to adhere to the requirements of NCDENR as much as practicable. The system uses Extended Wet Detention Basins for the treatment system. The outfalls flow from these facilities to the Camp Lejeune storm drainage system to tributaries of the New River. The systems provided greatly enhance the quality of the released water and provide some peak flow attenuation for downstream facilities. 4) ATTACHMENTS a) Storm Water Management Permit Application Form b) Extended Wet Detention Basin Supplement — Basin #1A c) Extended Dry Detention Basin Supplement — Basin #1 D d) Storm Drainage Plans e) Storm Drainage Calculations 3/19/2002 Stormwater Management Plan 5-13 Two Phase Design/Build Replacement of Family Housing Units Tarawa Terrace Housing, marine Corps Base Camp Lejeune, North Carolina STORM DRAINAGE CALCULATIONS GENERAL The project at Lejeune, Tarawa Terrace 1 (TT I), was originally approved by the Owner and NCDLNR using Dry Pond storage and treatment with additional treatment provided with grassed swales. It was decided by the Owner to spread out the buildings by relocating a number of the building to new areas. During this process it was also decided to eliminate as many ponds and swales near the buildings as possible and install a main storm drainage treatment facility at the end of the existing storm drainage collection system near the south end of TTl . The modifications resulted in a system with two larger storm water treatment facilities instead of many more small facilities. The first storm drainage treatment facility services that portion of the project denoted as Phase 1 A (the area currently under construction) and is located in Phase IA. This is a `Wet' fond and provides full treatment without additional treatment methods as used previously. The second storm drainage treatment facility services Phases 1 B, 1 C and other developed area in 171 to be upgraded in the future. This also is a `Wet' Pond facility. Attached is an overall map ofTT1 indicating the areas flowing to each facility. Phase I is the area at the right middle and contains it own pond. The large area to the northwest is that are flowing into the existing storm drain collection system ending at the new pond are to the south. The balance of the area will remain untreated at this time. The calculation are presented in two groups, one for Phase 1 A, the other for Phase 1 D. Phase 1 A calculations include piping calculations, Wet Detention Basin calculations, Pond sizing, and pond details. The calculations for Phase 1 D include the same information except, the calculations for the existing storm drainage conveyance system were not done. 3/19/2002 Stormwater Management Plan 10 - 13 r 1� /I ff I l �a@ }�}J �'iy it o• PQ � ��� �� i! i � F' jig III i _ 11} q,~ r i [3vsofu F�rJ �y �c u j�uY 'fr '\tl � FF � `� O• ` AOO j .� ... (Zo �,-.y�`</,� < P •' `•._ ,. 1 °`wc _ , f� - e YI` u•/\j F E \ ; \\ O G4 ` � � • \ t F S \\J'"�3 \1• 3 4 1 \ t 1 F f k f 4 ♦ f k 4 f k E S{ f 1 1 pp ® C r a z ! CO) G n y m / C h 1C 3� �tl to m z n :�' ¢ { �,�••., ATLANTIC OMSION' emr>m.•R µ"'wti ,- T GHAA59)LUM MARINE CORPS w"'L CMIA .LUNL, N,C- �� EI TARAWA TERRACE a $p HOUSING REPLACEMENT "�--- SEDIMENT & £ROSfON CONTROL TITLE REwsoNs Two Phase Design/Build Replacement of Family Housing Units Tarawa Terrace Housing, marine Corps Base Camp Lejeune, North Carolina PHASE 1A - STORM WATER TREATMENT CALCULATIONS 3/19/2002 Stormwater Management Plan 12 - 13 PIPE COMPUTATION SUMMARY Prc,ject: Camp Lejeune, Phase 1A Location: Jacksonville, NC Design Storm: 10-year Pipe Type: HDPE (n=0.0107 Computation Model; Manning's Equation Da-:e: November 27. 2001 Structure # - Structure # Peak Flow (cfs) Diameter Design Slope Min. Slope" Min. Slope - Outlet to 1 36.17 30 0.46 0.07 0.46 1 to 2 36.17 30 3.6 0.07 0.46 2 to 3 36.17 30 0.46 0.07 0.46 3 to 4 36.17 30 0.46 0.07 0.46 Outlet to 5 3.86 15 0.34 0.19 0.21 5 to 6 1.85 15 0.64 0,19 0.05 Outlet to 7 1.09 15 1.00 0.19 0.015 Outlet to 8 4.05 15 1.64 0.19 0.24 8 to 9 4.05 15 1.64 0.19 0.24 Outlet to 10 24.50 24 0.73 0.10 0.69 10 to 11 24.01 1 24 1 0.66 0.10 0.66 11 to 12 5,66 15 0.72 0.19 0.45 12 to 13 5.07 15 0.36 0,19 0.36 13 to 14 5.07 15 0,36 0.19 0.36 14 to 15 3.02 15 0.67 0.19 0.13 11 to 16 17,83 24 0, 92 0.10 0.37 16 to 17 3.71 15 1.42 0.19 0.20 17 to 18 2.91 15 1 0.48 0,19 0,12 18 to 19 2.4 15 1,01 0.19 0.08 16 to 20 3.97 15 1.84 0,19 0.22 16 to 21 10.58 18 0.60 0.15 0.60 21 to 22 10.28 18 0.57 0.15 0.57 22 to 23 3.00 15 0.67 0.19 0.13 22 to 24 6.84 15 1.63 0.19 0.67 24 to 25 5,53 15 0.44 0,19 0.44 25 to 26 4.81 15 0.89 0.19 0.33 26 to 27 1.12 15 0.19 0.19 0.018 " Minimum slope required to maintain 3 ft. per second when flowing half full. Minimum slope required to provide adequate capacity at full flow, ICI o 3(,o . /7 cf5 -7,D �As 5 a 1-7 crs = a 9S , . +�7�- Z I N6 a'--S 6N 01c lq F<1TOM wra7H = 2 0 7,Ps Lot oP�LS) 8% gP��Lcvflt/ �Z.,d0 !,uWram 5uf2-F. Z2. so Project CAMP LZ -TEU "6 Job No. 00Sheet bor— p16 r_-k 16P�C/L!Q1q y _ Z-Vl 0 Ely Date I! 7 0/ Ok'd Date BRIGGS ENGINEERING, INC. • 1800 W. Overland Road • Boise, Idaho 83705 1992 3.14 TABLE 3.14-C DESIGN DATA FOR EARTH SPILLWAYS STa G[ SPILLWAY BOTTOM WIDTH (0) IN FEET I MOS IN F[[T RINI.CS B !p 12 14 16 IB 20 22 24 26 2B 30 32 34 36 30 40 a 6 7 6 1 11 !3 a 1 4 2 a 0.5 V 2.7 2.7 2.1 2.7 2.7 2.7 2.7 2.7 2.7 2.7 2.T 2 7 2.7 2,7 2.7 2.7 2.7 39 3.9 3.9 3.9 3a 3.8 3.8 3.8 3,B 36 3.8 3.8 3.8 3.8 3.0 3.6 3.8 X 3 33 33 33 33 33 33 33 33 33 3 33 33 33 33 33 33 B Io L2 14 f 6 IB 0 2 a 26 28 30 32 }a 35 37 9 0.6 V 3.0 3.0 3.0 30 3.0 3.0 SA 30 3.0 30 3,0 3.0 3.0 3.0 &0 3.0 30 3.7 3.7 3.7 3.7 3.6 3.7 3.6 3.6 3.6 3.6 3.6 5.6 3.6 3.6 3,6 3.6 3.6 X 36 36 36 36 36 36 37 37 7 37 37 3 37 37 3 37 37 II 13 16 IB 20 23 1 25 20 SO 1 33 35 38 41 43 44 46 46 0.7 V 3,2 3.2 3.3 3.3 3.3 S.3 3.3 31 3. 3.3 3.31 3.3 3.3 3.3 3.3 3.3 S 3,5 3.5 3.4 3.4 3,4 3.4 3.4 5.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 3.4 4 I 1 41 I 41 41 41 41 41 41 3 is 4 ♦ 46 4e p 1 54 0,13 V 3.5 3.5 3.5 3.6 3,6 3.6 3,6 3.6 36 3.6 3.6 3.6 3.6 3,6 3.6 3.6 3.6 3.31 3.3 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3.2 3-2 3.2 3.2 3.2 3.21 % 44 1 44 1 44 44 4 45 4S 45 45 45 4S 45 43 45 45 I 20 2 2 3 35 39 43 47 51 53 57 60 64 68 TI 75 0.9 V 3. 3.6 3,a 3.8 3, 3.8 a 5.8 3,a 3- 3,6 3.a .a 3.8 3. 3 3.-1 3,1 5,1 3.1 3.1 3.1 3.1 31 3.1 3.1 3.1 5.L 3.1 3.1 3.1 3.1 % 47 47 46 40 48 48 46 48 4B 46 49 49 A 4 4 4 4 20 24 29 33 38 42 47 51 6 61 fi 7 1.0 V 4.0 4,0 4.0 40 4.0 4,0 40 4.0 40 4,0 4,0 4. Q 4. 4 a 4 S 3.1 3.0 30 30 3.0 3- 3.0 3.0 30 3 0 3 52 52 52 52 52 52 52 52 0 23 28 34 39 44 49 54 60 65 74 79 84 89 5 00 105 1.1 V 4. 4, 4.2 4.3 4.3 4.3 4.3 4.3 43 4.3 4.3 4.3 4 3 4.3 4. 4.3 4 S .9 .9 2.9 2.9 2.9 2.9 2.9 2.9 2.9 2.8 2.6 2.8 2.8 2.B 2.9 2.8 B % 55 55 55 55 55 55 55 6 6 6 6 6 6 S6 S6 56 6 I a 64 69 6 8 4 t V 4.4 44 44 4,4 4.4 4.5 4.5 4,5 4.5 45 4.5 4.5 4.5 4.5 4.5 4.5 4.5 5 2,9 2.9 2.6 2 8 2.8 2.8 2.8 2.b 2.8 2B 2.8 2.9 2.8 2. X 58 58 59 59 59 59 59 59 60 60 60 60 0 O 0 32 38 46 53 58 65 73 80 86 I 9 106 1 2 1 1 125 t33 IN 1.3 V 4,5 4.6 4.6 46 4.6 46 4.7 4.7 4.7 4,7 4.1 4.7 4.1 41 47 4,7 4,7 2,0 2.8 2,8 2.7 2.7 2.7 2.7 2.7 2.7 2.1 2.T 2.7 2.7 2.7 2.11 2.7 2,7 X 62 62 2 63 63 63 63 63 63 63 63 64 64 64 64 64 64 I 9 6 74 82 9 96 103 1 1 I I 4 4 l 4 V 4.1 4.8 4.8 4.B 4.8 4_8 4.8 4. 4 4 4 4 4 9 4 4 4 4. S 2.8 2.7 2.7 .2.7 2.7 2.7 2.7 2, 2,6 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2A X 6 -61' 67 67 67 66 68 68 60 6B 69 4l 50 B 66 75 B 9 101 1 13 4 1 I 1.5 V 48 4.9 4.9 5.0 5. 5.0 5.0 5. 5.0 5. S,0 5. 5. 5. 5.1 5,1 5.1 S 2.7 2.7 2.6 2.6 2.6 2.6 2.6 2. 2 6 6 % 69 69 TO 70 71 T I 71 711 71 1 72 7 72 72 7 46 56 65 75 84 94 104 112 122 132 142 $49 15B {68 ITS 187 197 11,15 V 5.0 5. 5.1 5,1 5.1 5.2 5.2 5.2 5.2 5. 82 5. 5. 5. 5.2 5. 2.6 2.6 2.6 2.6 2.3 2.5 2.5 2. 2.5 2.5 2.5 2.5 2. 2,5 2.5 2.5 2.5 % 72 74 74 75 75 76 76 76 76 8 6 7 6 6 76 0 62 72 83 94 105 115 126 135 145 156 16T 175 197 196 206 217 1.7 .4 .4 .4 2.8 2.8 2.5 215 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.S 2. 2.5 2.5 2.5 T6 78 79 80 80 80 80 00 80 90 BO 80 80 60 80 80 80 [ I T I B O 60 4 4 t.B V 5.3 5.4 5.4 5.5 5.5 5.5 5.5 5. 5.5 5.5 9,5 56 5. 6 5.6 5.6 S.e 2. 2. 5 2.5 2.51 2.4 24 2.4 2 . 2.4 2,4 2.41 2.4 2.4 2,4 2 A 2.4 2 A BO 82 03pla4 B4 B4 4 84 54 64 84 84 64 84 84 B4 04 B' { 141 T 140 132 184l7S B 20 1 22S 3 4b1.9 V 5.5 5.5 5.5 56 36 5, 7 5- 5.T 5.7 S .T 7 5,2.S 2.5 2.S 2,4 2.4 2.4 2.4 2.4 2.4 2.4 2,4 2.4 2 2.4 2.4 2.4 eB BB BB B8 BB BB BB bb 8I 3 7 12y5 642.0 V5.6 5.7 5.7 5.8 5.8 5.8 5.8 510 5.8 58 5.9 5.9 5.9 5.9 5,9 5.9 5 2.5 2.4 ,4 .4 2.a 2: 2. 2.3 -?.s 2.3 2.3 2.3 B 0 91 91 91 92 92 92 9 1 10 7 122 135 149 62 77 19Z ZOT 220 234 2 1 V 5.7 5,9 5,9 5.91 5.9 5,9 59 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 6.0 S a 4 2. 4 2.4 Z 4 2.4 2.3 2,5 2. N 2,3 2 2 93 5 93 45 95 0 84 100 116 13 V 146 163 177 194 2 10 224 2,$a 253 269 1 208 301 314 330 2.2 19 7 - LQ 6.0 6 61 fi 6.1 6.1 6.1 62 6.2 6.2 6,2 2. 2,4 2.3 2. 2.3 2.3 2. 2.3 2.3 2.3 2.3 2.3 2.3 2.3 23 2.3 % 96 9B 99 99 99 99 99 100 100 100 100 100 100 h00 IOtl IDO 100 90 108 124 140 156 17 193 208 226 243 236 275 2 2 306 323 341 354 2 3 V 60 6,1 &1 6.1 6,2 62 6.2 6.2 S.3 6.3 6.3 6.3 6.3 6.3 I&A 6-3 6. S 2.4 2.4 2.3 2,3 2.3 2.3 2.3 2,3 2. 2 2. 2 2 .2 I I 10 104 I 4 104 105 105 105 105 105 105 105 105 2 4 99 116 136 152 _ 6}I �7 3 ITo- F3 109 206 224 241 260 75 94 12 3 346 364 37 V 6.l' 6.2 62' 6 6.4 6,4 64 6.4 64 64 64 64 6,4 64 fi. S X 2 3 �2.3 23 2 3 i07 _ 22 106 2.2 'I'OB 2.2 i08 2.2 2. 2,2 .2 .2 105 105 1p6107 _ 108 i09 I04 I 10i_ID Source: USDA-SCS III - 100 1992 3.14 EXCA VA TED EARTH SPILL WA Y LEVEL PORTION Z / --- CREST AND CONTROL SECTION FLOW-� - r APPROACH (2 CHANNEL BERM EXfT SECTOR I NOTE: NEITHER THE LOCATION NOR ALIGNMENT OF THE CONTROL SECTION HAS TO COINCIDE WITH THE CENTIERUNE OF THE DAM, EMBANKMENT g PLAN VIEW WATER SURFACE X- LENGTH OF EXIT CHANNEL do STAGE (HQ) i CONTROL SECTION 20' EXIT SECTOR I LEVEL OR I r GREATER APPROACH CHANNEL g PROFILE ALONG CENTERLINE ,t00' CROSS-SECTION AT CONTROL SECTION Source: USDA-SCS I Plate 3.14-9 %'0 L 0 f'A FOOL VO!vMt5 /l ftl �5TcC 06) 010 +o (44) (IN/0,I),-, { VP ! r-1 CAL le), 0 = r"t- 9M, FOOL ESE ✓, rrrvn� -ram = 40 hP6 Se(Imk- 1-71)cNV 6el,. PPA W Dow" (rTan P, FboL) 1-75f--c.. 0, Gas a, 16 r c 2� 0,� G4,4-xt.o' - �032 N/FT 70 3 G �RoU Project L! � � �—� ��t%nl� Job No. _ A)7 Sheet I tq By �� Date Ok'd Date 04 261 990 r,-� -) K- V BRIGGS ENGINEERING, INC. • 1800 W. Overland Road • Boise, Idaho 83705 Cl- �. o Z • �3 !3' Ii �Od l •D, 84- 2/ 75-1 l� 7; 3/26s f �• v I D� 53 0 17j 09 3 1�,3 � � 13e 29j; -7 •� 2a144-1 47> 576 770 Lev + 213 17. o 1 r o 46 ! 9ro 3r 07J /1' Lo 7, 0�3/ U' o 81 Zo ,- / -31 780 Project CAMP t' � ��AJ6�- Job No. �r D Sheet � � 2 �P�15 OIU By �?. Date !/.Lal_a_ z Ok'd Date BRIGGS ENGINEERING, INC. • 1800 W. Overland road • Boise, Idaho 83705 5OLE8 Q4ePI 'asIoe . Peoa Pue]JeAo *M 0081 • 'ONI `JN1833NION3 S00188 a1eo Ply o alea m l8a45 'ON qop aaafo)d ,--z °l -_3 g c Li �Ll ►tom _ a zf LfN -06 I 77- Zv v � f VIS � i 2� i GUNU-6 Project Job No. Sheet By Date Ok'd Date BRIGGS ENGINEERING, INC. • 1800 W. Overland Road • Boise, Idaho 83705 - el SC�U�r� j.nlL 12-S-7 e L b i eF 22 GI �� �~ HT �V� �•�o GF I 2 r r 1128 Ole Project CLAMP �UP Job No. / -3 — -I Sheet OF/ By 1 5 Date tzlMoz Ok'd Date BRIGGS ENGINEERING, INC. - 1800 W. Overland Road - Boise, Idaho 83705 1992 J r F-S�W1� Ln UjW -- � w O W W Q W O W , J S ¢ c?\�wOZ aysO�zQ af-w �w p41awO�� rMO-MOO< Source: USDA-SCS Q Ld pWN� W�aVI 3W�r� QU-m� 00 0 m O U p W w I.- �wr aw (n�WO Om N L•-7 3.14 , .1 o W V) w _ V x a LO Q 1 C Plate 3.14-10 1992 TABLE 3.14-D CONCENTRIC TRASH RACK AND ANTI -VORTEX DEVICE DESIGN TABLE 3.14 Riser Cylinder Minimum Top Di Height, Minimum Size in Diameter, Thickness Thickness, inches Support Bar Thickness Stiffener inches gage 12 18 16 6 #6 Rebar or 11/2 x 16 ga. 11/2 x 3/16 angle (F&C) 15 21 16 7 - 18 27 16 8 - 21 30 16 11 16 ga.(C), 14 - ga.(F) 24 36 16 13 - 27 42 16 15 - 36 54 14 17 #8 Rebar 14 ga.(C), 12 - ga. (F) 42 60 16 19 " 48 72 16 21 11/4" pipe or 11/4 x 14 ga.(C), 10 - 11/4 x 1/4 angle ga.(F) 54 78 16 25 - 60 90 14 29 11/2" pipe or V/x x 12 ga.(C), 8 - 1'/z x Ya angle ga.(F) 66 96 14 33 2" pipe or 2 x 2 x 12 ga.(C), S 2 x 2 x 1A 3/16 angle ga.(F) angle w/stiffener 72 102 14 36 21/2 x 21/2 x 1/4 angle 78 114 14 39 2'/z"pipe or2x2x " '/4 angle 84 120 12 42 21/2" pipe or 21/2 x 21/2 x 21/2 x 21/2 x'/a angle 5/16 angle Note,: The criterion for sizing the cylinder is that the area between the inside of the cylinder and the outside of the riser is equal to or greater than the area inside the riser. Therefore, the above table is invalid for use with concrete pipe risers. Notez: Corrugation for 12"-36" pipe measures 22/a' x'/x"; for 42" -84" the corrugation measures 5" x 1" or 8" x 1" Note3: C = corrugated; F = flat. Source: Adapted from USDA-SCS and Carl M. Henshaw Drainage Products Information. III - 104 Two Phase Design/Build Replacement of Family Housing Units Tarawa Terrace Housing, marine Corps Base Camp Lejeune, North Carolina PHASE 1 D STORM WATER TREATMENT CALCULATIONS 3/19/2002 Stormwater Management Plan 13 - 13 J J V) d li 3-1 SNOISv,3N NV1d 3IIS 1lvu3AO _ =� u 1 w30d a OR 410H ° L - 33VM31 VmvV lVl 9 ra r a 'J'N '3Nn3f3l dl"IYJ 3SV9 S6WO 3NIb" q y { o �y{a yr - _� i`� v 6 T Niifi'i' NOISIAId OUNVIV �'ix., 61= i R u o � O � N - a � C N F m N 9 4 6 j I wN g Na L_ ca _ .00 r — — — — — — --� — -d II �w ry i� -- 0 hl _ Al LL C LL O 11 O 0 _ "m -- F LU Uffn Z , LLI oil x 44 iIl z ij IN HJIRI ;®;fir p'a�"� L61 o o l m � s 0 Wi PO Y �WWNtlpp 55..�� �P o� i n opn N ei ri N •e dy N of C ¢ U U 4 Q U 4 U m 6 ❑ ¢ p ¢ Ll ¢ ¢ U 6 o ! z A Yaxnw y I I 1 � i rv�M. � ❑ �� I m ❑ r,r r nr 5 � � z z I — 1 r r � F •i v 71 _ Y i. �.[ Y° � 1 Ing ❑ 1 B' il' `JI yy O = S• Z m V y II m LS ❑ gq O i6 _ �Qy n ..1 «�g i 3 e 3 E 5 e 1 5 oo�w.r •. .« ATLANTIC �NISION ••oars oom.Am� �A �W&AMMM �- - MARINE C LAARCORPS $45E CAMP lF_.1EUNE, N.C. TARAWA TERRACE MOUSING REPLACEMENT _ u$ CIVIL SITE DETAILS = REnsoNs _ __ SNOlSMki ..w """`"' N7ld 311S IIVU3AO iNDVOOVld32J N OOH 30VNa31 VMVNVl ;a�a _ 'D.N '3Nn3f3l dWVD 3SW S&IOD 3NiMft — s3svoosl'>t3m� .I.Hf1Iiw� Nolswa 3I1NVl1V i c a= - u � S S�:U I N u'i J1y SZSVw hN C Un {¢J y+ ppf1 I > .hnm NrNN 1y Cj C z VZ H mNa mW� OW « - U N xono m � y" c NNE Uwe e++ WD ¢ x OQ ZFO =O� �n i m4F a {4 G UT p3oW n° -------- I � I I � I w I p e I N I — I W n C= \ I _ I I Q I I � I I I I --I 0 V S.G C7 O Pg El o 0 I I k Q� U U Q 4 U Q V m Q 4 4 Q U ¢ U '" U Q U Q 4 1 l 1 I \ , I 1 l \ 5 , I r 1 II ,1 i/ i oq m zm1r� C� VI i 1 I � I � '1 } , o Y IN 1 e � m L: a S t3 Fig _ HIM ro\ }' •\� O � A I II• ��3 � ���� r V y PLO 0 i �v O 7sy,5II V SyY�� u4, 1 1 ` \+ l + I _ jj/1rj1I jj/IyI1 i, + y i 1 9jATLANTIC 91NSION'`'r a,mm5_INE CORPS &SE CAMP LEJEUNE, N.G.TARAWA TERRACEJL H U ING R P C MENT °„ PHASE 1 D POND PLAN RLVSIONS • I I I U, 1 i I SNOISY13n Ntlld ONOd 04 35CNd 1N W d d oNisnOH - 3OVd1J31 VMVSVl }} " ` . N m •� 'ON '3Nn3f3l dYPo9 3S/B SdyO'J 3NId" e r w�M 'v»i px 6 E c�m,6 LN11H11 _ Nolswa :)i1NrI vIC •/ C / \ \ 11 ♦.Ilk \ J i `5 i aye � I I I I.� _ ♦'\\ `\ , \\ ` \\ \\ 4 I 1 y \ 1 `�a t•, I 1 ,/ � !!` it 1 1 �_I 1 f - \ "� .\ '`\, \ ,f II `'• 11 5�E@'i915 Nit$`. \\ ' ``♦♦\ J 3 II 1. 1i lh`YY` \\t+l 1 �il o� \`\ ♦ ♦`` \ �` I t • 1 I 5 5\ l 5 \ ♦ \ `♦` , 1 III 1 l `I �♦ ` h�� I II 1 '�� '\\ �.\, \♦ i \ ` ' 1. .R �`\' '/ /• I \ ; 6 1 I 5 _ — _ 1\ • K � I It I I i sNolse�tl _m SlIV130 ONOd O � 3SVHd ' u q 99 p p1a e Pa y91 q+ e yy _o 0 LO . K- ININ OV-Id 8 JNIsno 33V� J831 vffi Vi '7'N '3Nf13F37 drM 35YB Sdtlp� 3NIym [I[AI.WN. WI➢DtY �I 1r SiLY�OeSYlimg .I�S IA� .".GM '>1oFlou wwu NOV4lUa OliNYl1Y 12 IRE RIPI oh � 6�g � �, !g ' A ��# rn Ni � eG���k§��k� 9 w _ p •n,h w �� � � ( 9 m O ��1���LL , g2h DZ JJJ O ¢ g "3 ' 11 C?�� rn $ li�ouu 4 II o U a ------------- ® oI _ _ t 17 -'8-;•p 0. I � Fau Iy m l , V0�Umg; �� = 4,05- -r 0.009C-r) a, os + 4.00 (4.3), 0• g37 RECEIVED JUN z 6 2002 DWQ PROD # SW F ��U ¢Z(> /i�DO VOLUP?� = RRlAlTAU, (IqV) /", 41AWA 1 it x 014-37(I llt l) x. '112 Fr: AM �, 53 �/Fr. ale 275) 2 cf frR�A: /73, g 2-&,5.A roux SUgpfic6 hReA'46 ap 2141%)WwH Dl fiftr .9 ©r- (p,4 j Cm! 5,001 14-�eR.M r 1140. 06-reNT Oti -rl mE II 867 3 707-55 APB ftV-4 �ZS f P%E 6-OF 8 4,6 HisY- 3r 660 59C. lHe- /72) 0o0sec.. PZ4W POWAJ C? = 275j 7 3 2 f (Tc-w 0t bA � -72, se,c. Mince A"y CAD cf6 - p. 281 FT 2 0,6 2W 4- )(2 X/Z/1=77 05a7 Project L..�ll�.�� Job No. Sheet J �itS 16S� „l L2 By _ � j Date-5/lb 02— Ok'd Date i 6 G44-0G BRIGGS ENGINEERING, INC. • 1800 W. Overland Road • Boise, Idaho 83705 L. L. 7'�MfbWRY t�V �57' d 6,0 700 Pao � FA'- /S&l 070 201� I4-� 2 /8� 4-6 STa246E t 941008 403�814- -r6M tom, Po n L- Vot.0 M6 = 27 5) 73Z Gf MJ,.5. C-tf-V 6, 4-0 W M6V6NT POW 01 - EL -eV" vTo2 � d,0 �27, 323 f•o �2-71F96 `25fdo5-" 2.0 /4z, QgS 265101-0 �. /5-61(0 t 41 (1-) 840 4, o /70177 �F781531(, 5t 0 106� 070 75-7j 3 S8 Fo RefW �. 010 17 757 l+D LZ/000 191 87E 2, o 24) q / 2 4-413 35` 3, a 5�1 tq � 73/ 607 4-x �7/ � r7 /00/ g4-I � 0 4,31900 14-9) e§4-Y Project Job No. Sheet 2 Awl) By _ 48 Date 3//gr �- Ok'd Date 2• 0� BRIGGS ENGINEERING, INC. • 1800 W. Overland Road • Boise, Idaho 83705 d. 57 4, RUNOFF /o YR- 2. S 13f-s60 o �d HP-- !00 co2 = �. rp- Dvf2t7t O,v STOA-w? 4-�- 1(2, 17-�, a 2-/ 16 �� �r z 99 gel 902 Tap o 1 61 oc. f14-T�9P. Pao 8' -Aog1 L-&&E- y To F46 282 s U51NA 915f-'k CURDS (6Ha-f Cpof Wffe-N AJ PASS Q �1zC-4 9 P E-:, -v Pis 4-1 cs e &HW-r &,Jl-rN oz 141cfL oloD d9NO P576RMWE PJA = 72 /, Din :G r twf Ifs 5 P15eK f ,)Fw(d) Cff64- CAPAUzY 814SE-D ON HE:P-0. 0- (!, 4q F Project �� �{llll Job No. 3 D/IOSheet By u8 _ Date 4 Z Ok'd Date (; a L BRIGGS ENGINEERING, INC. • 1800 W. Overland Road • Boise, Idaho 83705 l 4-.,l As 100 (/9 4 12-) r0i (p (ORS I �� e06ffi c4e,"-�) r Fr 2 (6 o `' ptFr V16 1) G pj�5 (6 N o ; 7Qr-.g) v�oN� a�so(/vi�pl�IV) 51Z� = I, Q Dot 32'4-a 10'PIP6- S664p/ o" = ¢61 J '1�LoG� j 4 . o 1s c Project E Job No. 1607 Sheet 4— nt= eS �J lu By Date Z Ok'd Date BRIGGS ENGINEERING, INC. • 1800 W. Overland Road • Boise, Idaho 83705 M 11:22a Parker & Associates, Inc. , fig 2pQI 10:.03AN r+CGENR W1R) (910) 455-3441 p.2 NO.555 P. 95% TSS REMOVAL 30 FOOT VEGETATED FILTER REQLMD DEPTH 3 3.5' 4.9' 4 S 5.0' 5.5' 6.0' 6.5' 7.0' 7.5' n" % 10% .9 .8 .7 .6 :5 0 0 0 0 0 20% 1.7 1.3 1.2 1.1 1.0 .9 .8 .7 .6 .5 30 % 2.5 2.2 1 1.9 1.8 1 1.6 1.5 1.3 1.2 1.0 .9 40% 3.4 3.0 2.6 2.4 -11 1.9 1 1.6 1.4 1.1 1.0 . 50% -4.2 3.7 3.3 3.0 -2.7 2A 2.1 1.8 I.S. 1.3 60% 5.0 43 3-.8 3.5 -3•.2 2.9 2.6 r2.3- 2.0A16 70% 6.0 5.2 4-1 4_l 3 7 *3.3 29 2.5 2.1 80% 6-.8 6.0 5.2 4.7 .4.2 3.7 3.2 2.7 2.290% 7.5 6.5 5.8 5.3 4.8 4.3 3.8. 3.3 2.8100`Yo 8.2 7.4 6.8 6.2 5.6 5.0 4.4 3.8 3.2 *Rsvissd IDJ31197 %% TSS-REMOVAL NO VEGETATED FII.TER REQUMI) DEPTH 3' 3.5' 4.0' 4.5' 5.0' 5.5' 6.0' 6.5' 7.0' 7.5' IMP % 10% 1.3 1.0 1 .8 -7 1.6 .5 14 1 .3 .2 1 .1 20 % 2.4 2.0 1.9 -1.7 1.5 1.4 1.2 1 1.0 .9 .6 30 % 3.5 3.0 2.7 2.5 2.2 Ll 1.6 1.3 1.1 .8 40% 4.5 4.0 3.5 3.1 2.8 2.5 2.1 I.A. 1.4 1.1 50% 5.6 5.(Y .4.3 3.9 3.5 3.1 7.7 ' 2.3 1.9 1.5 60% 7.0-. 6.0 5.3 4.8 41 3.9 3.4 24 2.4 1.9'.�� � 70% &.1 U.' • &0 S.S- 5.0 4.5 3.9. 3.4 2.9 i 2.:4 80% 9.4 9.0 7.0 .6.4 5.7 5.2 4.6 4.0 3.4 � �I 909b 10.7 9.0 7.9 17,2 6.5 5.9 5.2 4.6 3.9 3-1 100% 12A. 10.0 8.8 8.1 7.3 ` 6.6 5.8 5.1 4.3 3.6 The required surface area calculated from the tables is to be provided at the pern azont SFg 1992 .......1 - t 800 Riser Inflow Curves Legend 500L''-'- L_..._.. Weir flaw, QW=9.739 OrN372 I 4UU ..._. ,, ..,, : s on fi LB flaw, Qo=3.782 Q2Ft 1 300 .,. - — ($1117 200 100 so 60 40 S 50 20 10 :. 1, •, i :�T {yf ,J 1 - 4h r t ot I�i I 01 02 0.3 0.4 0.5 0.6 018 IA 2.0 3.0 4.0 5.0 6.0 BA IAA Head Irt feet, measured from creel of riser 3.14 Source: USDA-SCS Plate 3.14-8 111-97 LO OF 1 1992 3.18 i MAIN _MEN= M. "M �t _ 1f� rrw rrrrrwr rrr r rrirwr�rwrrr�irr �w=rrr r�rr�..rr�wwrr. wwr�� I Source: USDA-SCS 4 4 r Plate 3.18-3 7 of 8 Project Summary Report 9 Project Description Worksheet t Pond exit channel Flow Element Trapezoidal Channel Method Manning's Formula Solve For Channel Depth Input Data Mannings Coefficient 0.030 Slope 0.005000 Rift Left Side Slope 4.00 H : V Right Side Slope 4.00 H : V Bottom Width 46,00 ft Discharge 282.00 cfs Results Depth 1.37 ft Flow Area 70.3 ft' Wetted Perimeter 57.26 ft Top Width 56.92 ft Critical Depth 1.02 ft Critical Slope 0.013450 ftlft Velocity 4.01 ft/s Velocity Head 0.25 ft Specific Energy 1.62 ft Froude Number 0.64 Flow Type Subcritical Project Engineer: Larry Brazeau c:lhnesladlfmwllejeune.fm2 BRIGGS ENGINEERING, Inc. FlowMaster v6.1 [614nj 06/10/02 02:28:04 PM © Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA (203) 755-1666 V-a9&A -O"-- A nF A Michael F. Easley, Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Gregory J. Thorpe, Ph.D., Acting Director Division of Water Quality Wilmington Regional Office May 30, 2002 Cdr. Steven R. Scanlan, CEC, USN MCB Camp Lejeune Public Works Officer 1005 Michael Road Camp Lejeune, NC 28542 Subject: REQUEST FOR ADDITIONAL INFORMATION Stormwater Project No. SW8 010420 Modification Tarawa Terrace Phases IA, IB, IC and ID N62470-97-C-7111 Onslow County Dear Cdr. Scanlan: The Wilmington Regional Office received a Stormwater Management Permit Application for Tarawa Terrace Phases IA, IB, IC and ID on March 25, 2002. 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 either delineate all wetlands on site, disturbed or undisturbed, or note on the plans that none exist. 2. Please provide typical building dimensions and the square footage .for .each .typical building. A :building .legend is shown on -sheet C-101-C, .but it does not show either dimensions or .the square footage. If this legend is applicable to IA, 1B, I and 1D; please -expand it to include dimensions and the square footage and state so on the.plans. 3. Please specify the name and spacing requirement for the wetland species to be planted on the first 10' of the 6:1 sloped area below the permanent pool around the pond. 4. Please report all built -upon areas in square feet on the application. It is easier for me -to find any errors when I verify the numbers if they are reported in square feet. -5. Please add a vegetated filter to the plans and provide a detail. The calculations•fgr'Pond'ID indicate that the needed surface area to achieve a 90% reduction in total suspended solids cannot beprovided due to space constraints. The State has two TSS charts which may be used, one of which is for 85%, however, use of -the 85% chart results in a smaller surface.. area,.hence,.a.30' vegetated,filter:is required at the outlet. The detail must include -the flow spreader mechanism, inverts (upstream:and downstream) grass, type, slope, etc. The vegetated filter is NOT simply a ditch connecting the pond outlet to the -receiving stream. Please see the attached detail for information. 6. Please initial item (e) on the supplement for Pond 1 D,'regarding the requirement for a 30' vegetated filter. 7. Please provide calculations demonstrating a non -erosive -velocity in the vegetated filter. ARM KME R N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 (910) 395-3900 Fax (910) 350-2004 Customer Service 800-623-7748 Cdr. Scanlan May 30, 2002 Stormwater Project No. SWS 010420 Modification S. Based on my interpolations between elevation 5 and 6.2 in Pond 1 D, the provided volume at elevation 62 is deficient by about 40,000 cubic feet. Please correct this calculation and provide an elevation at which the 1 " storage requirement can be met. By my calculation, the minimum elevation should be closer to 6.4. Please revise the temporary pool volume and elevation on the supplement. 9. The clay liner specified for the bottom of the pond may cause a problem with maintenance. As the pond fills up with sediment, removal will become necessary. How do you propose to deal with potential tears in the liner? 10. 1 have changed the sediment removal depths reported on the supplements. The 1.25' originally reported would mean that the pond depth would be all to decrease until it was only 1.25' deep before sediment removal would be required. I have changed this to read that once the permanent pool depth is reduced to 3.75', the sediment must be removed. 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 June 30, 2002, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue.the permit. The construction -of any .impervious surfaces, other than a construction ,entrance under an -approved Sedimentation'Erosion, Control Plan, 'is a violation of NCGS 143-21-5.1 .and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not acceptable. If you have any, questions concerning this matter please feel free to call me at (910) 395-3900.% Sincerely, Linda'Lewis Environmental Engineer RSS/arl: S:1WQSISTORMWATIADDINFO120021010420.MAY cc: Linda Lewis Dean Briggs, P.E. HUNT BUILDING CORPORATION 271 Tarawa Boulevard, Camp Lejeunc, NC 28543 Tel: 910-219-4644 FAX: 910-219-4646 TRANSMITTAL. TO: NCDENR Wilmington, NC ATTENTION: are the following:FX Attached Shop Drawings TRANSMITTAL NO.: J8381.118 DATE: 22-Mar-02 REPLY TO: Jo Anne Evans, Secretary PROJECT: 234 Family Housing Units Camp Lejeune, NC CONTRACT NO.: N62470-97-C-7111 HBC JOB NO.: 8381 ❑ under separate cover via: ❑ Samples ❑ Literature DESCRIPTION NO. OF COPIES OR QTY Completed Stormwater Manaqement Permit Application Form 1 original 1 copy Storm Water Management & Erosion Seidmentation Protection Plan 2 copies Resubmitted for Modification, March 19, 2002 r` Check # 40012867 in amount of $420 �] ,v 1 check rr,, Civil drawings 0 V 2 sets These are transmitted as checked below: For signature and/or notary �] For your use ❑ As requested g For review and comment Action on this submittal is required on or before: REMARKS: ❑ Approved as submitted Approved as noted Returned for correction Resubmit 0 copies in order to maintain the scheduled progress of the project. HUNT BUILDING CORPORATION) MNK 20nZ (Signature} Jo Anne Evans, Secretary (Printed Name) BY. --rz5l�r' V c-D State of North Carolina Department of Environment and Natural Resources; Division of Water Quality %, CD STORNMATER (MANAGEMENT PERMIT APPLICATION FORNI This form may be phorocopied for use as an original ' tV iV El'F I. GENERAL INFORNIATIOv 1. Applicants name (specif_,r the narne of the corporation. individual. etc. who owvns the project): COMMANDING GENERAL, MARINE CORPS. BASE. CAMP LFATEUNE 2. ' Print 0%vner/Signing Official's name and title (person legally responsible for facility and compliance): CDR S.R- S=AN,—PUBLIC-WQRKS OFFICER r� 3. \flailing .address for person listed in item 2 above: 0XtIAIDDING GENERAL, -MARINE CORPS. BASE, 1005 MICHAEL ROAD Gity: CAMP LFJEUNE State: NORTH CAROLINA Z.a: 28547-2521 Te?ephone Number: f 910 } 451-2581 4. Project :tiame rsubdivisicn. facilir , or establishment name - should be cons':sten', orojeci mine cn clans. spec:fications, letters. operation and maintenance agreements. etc.): TARAWA TERRACE HOUSING REPLACEMENT PHASE ID POND 4 PHA% 14 5. Locauor, of Project (street address): TARAWA TERRACE I Cicv: CAMP LETMZ, NORTH CAROLINA Couniv: ONSLOW 6. Directions to project (from nearest :major intersection): FROM HWY. 24, El�]'I'ER TARAWA TERRACE I ENTRANCE; PROCEED ON TARAWA BLVD. TO SITE (AT TARAWA & PELELIIU) 7. Latitude'. 34" 44' Longitude: 770 22' of project 8. Contact person who can answer questions about the project: Name: DEAN BRIGGS Telephone dumber: ( 208 i 344-9700 Fax: 208 345-295Q II. PERMIT INFO RINIATI0N: 1. Specify whether project is (check one): New Renewal X_ _Nlodif;calion Form SWU-101 Version 3.99 Page 1 of 4 2 3 If this application is being s rWlys the result of a renewal or modification to an existing permit, list the existing permit number_ - and its issue date (if known) 7-3-01 N62470-97-C-7111 Specify the type of project (check one): Low Density High Density X Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): CA.' -VIA Nlajor X Sedimentation/Erosion Control �404/401 Permit x NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project, �M R= lgnL IE USED To GaP'IihRE IUUF F%M THE 1' SICFM IN GM TO =E CUI' SIMM SaIL>S RU PCIWI)WIS. 2. Stormwater runoff from this project drains to the V�iIrIE Q�K River basin. 3. Total Project Area: 189.90 acres 4. Project Built Upon Area: 43 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. A� 1,4 190"?d f D Basin Information Drainage Area 1 Drainage Area 2 Receiving Stream Name MRMEW CREEK M=E� CREEK Receiving Stream ClassI T Drainage Area 700,445 SF 7,571,5W SF Existing Impervious' Area - - Proposed Impervious Area 304,048 SF 3 r 255 674 SF % Impervious* Area (total) 43.4 43 Impervious" Surface Area Drainage Area I Drainage Area 2 On -site Buildings 134,600 SF 1 413,086 SF On -site Streets 88,862 SF 976 615 SF On -site Parking 54,014 SF 579,348 SF On -sine Sidewalks 11 ► J26 SF 120,661 SF Other on -site 15,246 SF 165,964 SF -- Off-site - Total: 304,048 SF Total: 3 255 674 SF Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, Sidewalks, gravel areas, etc. O� Form SWU-101 Version 3,99 Page 2 of 4 7. How was the off -site impervious area listed above derived' NA IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The follov.-ing italicized deed restrictions and prorective covenants are required to be recorded for all subdivisions. outparcels and future developmenc orior co the sale of ar.v 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 srormwater 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. iNio more than square feet of anv lot shall be covered by structures or impervious materials. Impervious materials include asphalt, ravel. concrete, brick, stone, slate or similar material but do not include wood decking or the water surface of swimming pools. 3. Swales stall nor be filled in, piped, or altered except as necessan, to provide drivewov crossings. 4. Built -upon area in excess of the permitted amount requires a state srormwater management permit modification prior to construction. .i. .ill permitted runoff from cutoarcels or future development shall be directed into the permitted srormwater control system. These connections to the stormwater control system shall be pen-ormed in a manner that maintains the integritv and performance of the system as permitted. By your signature below. you certify [hat the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above. that [he covenants will be binding on ail parties anc oersor.s claiming under them. that tr,ev %vial run with the land, that the reauired covenants cannot be changed or deleted without cor:currence from the State and Char chev will be recorded prior to the sale of anv loc. V. SUPPLEMENT FOR`IS The applicable state siorm,.vater management permit supplement mrm(s) listed below must be submitted for each B..MP specified for this project. Contact the Scorrn%vater and General Permits Unit at (919) 733-5083 for the states and availabili[v of these forms. Form S4lrU-102 Wet Detention Basin Supplement Form SvVU-103 Infiltration Basin Supplement Form SWU-104 Law Density Supplement Form SWU-105 Curb Outlet Svstem Supplement Form SWU-I06 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplemem Form SWU-109 Innovative Best IVianagement Practice Supplement Form SWU-101 Version 3.99 Pace 3 of 4 54:8f111TT._\i R1:0U1RE,,lENTS Only' complete application packages will be accepted and reviewed by the Diyis:on of ,.Water Qualic-: ICWAI)). A complete package includes all of the items listed below. The comple�e applicar,nn package should be submitted to the appropriate D` O Regional Office. [. P'-use :I::�.:_=[e ;hat :'OL' e �.'7'.:CP^. cne :Cllc%vir.'7 rnn, -e,� ..._...._.'.C.". lJ ,...a ir!`: .. .,._ :'•�� � .:Cc� t1C:it "O ?acn :te" ?. ir.:t:ais Clr:2:na! arse One coov of the Storm'- a:er Marage.menz ?ermit ?• ;ci:cat:or. =,:r7n acoLcabit, Sucolemem ?orm,(sl `er eac:, 3`.1P D8 • Pe ---'it acp#ica.:cn prccessina fee of 3420 ;payable cc • %'eta:!e-.=auve desc-:ctien cf srorn%vate- treat:^enc, rnana=ement � -- • ...'c cccies of plans and spec:ficac:or.s, !r.c LC'.ng' Deve!c?rnent.''P-cjec. rare ar.d :.--n wand Or h .ir" %v Cale '.iezr..'�� .:aterlir.e ^� Dimer.s:cr,ed :,racer::.' croiec: boundar'.' Laca,:or, mac :_"% narnec ..wets or XCSP nt -ter, rcocszc _cr.;curs. sUcc e?e'.atc:-s.....she� C'e:a:ls o: macs.=-a!na�e ,eat_res. colle=.:cr s•.'s:}r-s. a::_ s.a-... .'a:-. _...._..,.:�eas�:zs eaar Cs ,ei:.._..,__. or a -:oce cn cfar.s :`. . r.cr.e ex a; t.a.n_'2e VIL AGEN-1 .til_'THORIZ.-kTIO`' . ;:.. sr..� „_ -:ate au:;-cr ;c anot�r- .r.c: .�.:ai or ...... so ...c..::e' rr:a_ _ ._...... _, ...c.:cn :r .'o•�, BRIGGS ENGINEERING, INC. 1800 W. OVERLAND RD. - - �:•.. BOISE IDAHO Mate: =hcr: : . (208) 344-9700 Faxt i (208} 345-2950 VIII. APPLICANT'S CERTIFIC.aTIO`N 705-31 i, (pr:rr )r c pe name of persor lisred in General Informauon. item ZI _ rE✓C,.✓ /? SC%%L /1,4 cer;ifv char ;he information inc!uded on this oermic application form is, to the best of :w kno,,vlecga. ccr—z ec. and Chat the project will be corsc-uc_ed :n conformance with the approved plans. chat ;he required deed rest-icz'ons ar.d protective covenants will be recorded. and that the proposed project cor-;plies '.vith the require.^..enLaof 15.a NCAC 2H' .I000. $ig nature: Hate: 22 MAIf o'Z Form S %%. t: - l 0 I `rcrsion 3.99 Page 4 of 4 .� �0 W ATE,gQ �O Gy T Commander S.R. Scanlan, CEC, USN Public Works Officer, Marine Corps Base 1005 Michael Road Camp Lejeune, NC 28542 Dear Cdr. Scanlan: Michael F. Easley, Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources Gregory J. Thorpe, Ph.D., Acting Director Division of Water Quality Wilmington Regional Office April 10, 2002 Subject: Tarawa Terrace Stormwater Project No. SW8 010420 Onslow County 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 1D pond) which will treat the runoff from the entire Tarawa Terrace development starting with Phase 1B. Concurrently, a modification to replace the dry detention basins in Phase 1A with a separate wet pond (known as the Phase I pond) is also proposed. It is my understanding that the proposed impervious areas under Phase 1B 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: E The Phase 1D 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. The proposed.Phase ID Pond must meet the design guidelines established in 15A NCAC 2H.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. FO —A N.C. Division of Water [Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 (910) 395-3900 Fax (910) 350-2004 Customer Service 800-623-7748 Cdr. Steve Scanlan April 10, 2002 Stormwater Permit No. SW8 010420 If you have any questions, please do not hesitate to call meat (910) 395-3900. Sincerely, Linda Lewis Environmental Engineer RSSlar1: S:1WQSISTORMWATILETTERS1010420.APR cc: Tony Sholar Linda Lewis Subject: RE: TTII Date: Mon, 8 Apr 2002 15:45:08 -0400 sa From: Sholar GS14 Anthony <SholarAG@lejeune.usmc.mil> lnval,d To: "'Linda Lewis"' <Linda.Lewis@ncmail.net> Signature Linda, 1. After award, we would expect approximately 30 days for contractor to mobilize and start demolition (pond will be located on existing housing sites) and 30 days for demolition. So actual pond construction would begin 60 to 90 days after the award date. 2. Your assumption is correct. Phase I and II, plus all future development in TTII will be covered by 010420, The entire TTII area will be treated by this pond to include existing housing areas once the pond is constructed. New construction phases will merely replace the existing units. Unless you have any other questions, we would like to proceed with Phase IB construction. . Thank you, Tony -----Original Message ----- From: Linda Lewis [mail;�o:Linda.Lewis@ncmail.net Sent: Friday, April 05, 2002 3:49 PM To: Sholar GS14 Anthony', - Subject: TTII Dear Tony: I received the March 27, 2002, letter from Commander Scanlan. I have not had a chance to do'a quick review of the information submitted on March 25. It is my understanding rom this letter that a wet pond will be constructed as an initial part of the Phase II construction which is expected to be awarded in the fourth quarter of 2002. I have two questions: How long after the contract is awarded will construction begin? The letter is a little confusing as to what phases will be treated. Am I correct when I say that all the development permitted under 010420 will be treated plus an undetermined amount of future development within the TT project? If this is not correct, please advise. Thanks, Linda. 1 of 1 4/8/2002 5:09 PM UNITED STATES MARINE CORPS MARINE CORPS BASE PSC Box 20004 Case Lejeune, North Carolina 28542-0004 NC Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405-3845 Attn: Mr. Rick Shiver Dear Mr. Shiver: SUBJECT: MODIFICATION OF STORMWATER PERMIT (SW8010420) IN RI:IT i(rwtt'IVIr 11330 PWO 27 Mar 02 As discussed in our March 4, 2002 meeting, we would Like to modify our stormwater permit (SW8010420 signed July 3, 2001) for Phase I of the Tarawa Terrace (TT) Housing Replacement Program. We intend to replace all of the family housing units in Tarawa Terrace, a large housing area divided into TT I and TT II, with each section containing roughly 900 housing units. The TT Replacement Program will be conducted in phases over the next 10 years. Phase I construction, located in TT I, was split into Phase IA and Phase IB. Construction is well underway for Phase IA, but the density of the units and the approved stormwater design has resulted in a less than desirable finished product, creating our need to modify the permitted stormwater management plan. Phase II, the next piece of the TT Housing Replacement Program, has been approved by Congress, is being developed now, will replace an additional 317 units in TT I, and is expected to be awarded in the fourth quarter of calendar year 2002. We would like to modify our Phase IA design to increase usable yard area for residents adjacent to the permitted stormwater detention ponds. More significantly, we also would like to completely revamp our Phase IB design, reducing the impervious area from 48% to 43%. In addition we would like to modify the Phase IB stormwater treatment design to include one large stormwater detention pond (TT I Stormwater Pond, identified as Phase ID in the permit modification application). This pond will treat stormwater for Phase IB and all future TT I construction phases. Per our meeting, we do not want to negotiate a contract modification with the current contractor to construct the TT I Stormwater Pond. Because Phase I funding has already been appropriated, we would be forced to delete badly needed dwellings to fund the new pond, and obtain authority from Congress prior to proceeding. Also, the pond site will require demolition of approximately 20 additional homes that are currently occupied. This will further compound the existing housing shortage for our young married Marines. This letter is our commitment to fund the TT I Stormwater Pond in Phase IT. In addition, we will construct the pond as the initial step in the Phase II project. The permit modification application reflecting the new design was.hand delivered to your office on March 25, 2002. This proposal has several advantages. It will allow for treatment of all TT I stormwater, not just Phase I, before the end of a multi -phased construction program. This stormwater currently discharges directly into Northeast Creek. It will also improve the site design, reduce the percent impervious area, allow us to 11330 PWO 27 Mar 02 schedule vacancies for the additional demolition, and defer the cost of the pond to Phase II where it will be competitively bid vs. negotiating a very large sole source modification. Per our March 4`h meeting, we would like to proceed with the construction of the remainder of Phase I per the new design submitted by separate enclosure, with the firm commitment that we will treat the stormwater runoff from Phase IB, and the remainder of TT I, in the pond proposed for Phase II. If you have any questions, please call me at (910) 451-2326, or the Deputy Public Works Officer, Mr. Tony Sholar, at (910) 451-2213. Copy to: Assistant Chief of Staff, I&E 2 Sincerely, S.R. Scanlan Commander, CEC, U.S. Navy Public Works Officer By direction of the Commanding General 1 �i p-�',7 �eW frv� er►-, a1 I reserved UNITED STATES MARINE CORPS KARZNE CORPS BASE PSC Box 20004 Camp Lejenne, North Carolina 28542-0004 NC Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405-3845 Attn: Mr. Rick Shiver Dear Mr. Shiver: C:4 SUBJECT: MODIFICATION OF STORMWATER PERMIT20) mamyawmm 11.330 PWO 27 Mar 02 As discussed in our March 4, 2002 meeting, we would like to modify our stormwater permit (S148010420 signed July 3. 2001) for Phase I of the Tarawa Terrace (TT) Housing Replacement Program. We intend to replace all of the family housing units in Tarawa Terrace, a large housing area divided into TT I and TT II, with each section containing roughly 900 housing units. The TT Replacement Program will be conducted in phases over the next 10 years. Phase I construction, located in TT I, was split into Phase IA and Phase IB. construction is well underway for Phase IA, but the density of the units and the approved stormwater design has resulted in a less than desirable finished product, creating our need to modify the permitted stormwater management plan. Phase II, the -next piece of the TT Housing Replacement Program, has been approved by Congress, is being developed now, will replace an additional 317 units in TT I, and is expected to be awarded in the fourth quarter of calendar year 2002. We would like to modify our Phase IA design to increase usable yard area for residents adjacent to the permitted stormwater detention ponds. More significantly, we also would like to completely revamp our Phase IB design, reducing the impervious area from 48% to 43%. In addition we would like to modify the Phase IB stormwater treatment design to include one large stormwater detention pond (TT I Stormwater Pond, identified as Phase ID in the permit modification application). This pond will treat stormwater for Phase IB and all future TT I construction phases. Per our meeting, we do not want to negotiate a contract modification with the current contractor to construct the TT I Stormwater Pond. Because Phase I funding has i:Aready been appropriated, we would be forced to delete badly needed dwellings to fund the new pond, and obtain authority from Congress prior to proceeding. Also, the pond site will require demolition of approximately 20 additional homes that are currently occupied. This will further compound the existing housing shortage for our young married Marines. This letter is our commitment to fund the TT I Stormwater Pond in Phase II. In addition, we will construct the pond as the initial step in the Phase II project. The permit modification application reflecting the new design was hand delivered to your office on March 25, 2002. This proposal has several advantages. It will allow for treatment of all TT I stormwater, not just Phase I, before the end of a multi -phased construction program. This stormwater currently discharges directly into Northeast Creek. It will also improve the site design, reduce the percent impervious area, allow us to 11330 PWO 27 Mar 02 schedule vacancies for the additional demolition, and defer the cost of the pond to Phase II where it will be competitively bid vs. negotiating a very large sole source modification. Per our March 4e4 meeting, we would like to proceed with the construction of the remainder of Phase I per the new design submitted by separate enclosure, with the firm commitment that we will treat the stormwater runoff from Phase IB, and the remainder of TT I, in the pond proposed for Phase II. If you have any questions, please call me at (910) 451-2326, or the Deputy Public Works Officer, Mr. Tony Sholar, at (910) 451-2213. Copy to: Assistant Chief of Staff, I&E 2 Sincerely, A/�/� S.R. Scanlan Commander, CEC, U.S. Navy Public Works Officer By direction of the Commanding General