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HomeMy WebLinkAboutSW8080714_HISTORICAL FILE_20080721STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 O8O"ik4 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE E008 012\ YYYYMMDD Michael P. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources 1 Coleen 11. Sullins Director Division of Water Quality July 21, 2008 Carl Baker, Deputy Public Works Officer Camp Lejeune 1005 Michael Road Camp Lejeune, NC 28547-2521 Subject: State Stormwater Permit No. SW8 080714 MCB Camp Lejeune- Special Missions Training Center High Density Commercial infiltration Basin Project Onslow, County Dear Mr. Baker: The Wilmington Regional Office received a complete State Stormwater Management Permit Application for MCB Camp Lejeune- Special Missions Training Center on July 15, 2008. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Session Law 2006-246 and Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 080714 dated July 21, 2008, for the construction of the subject project. This permit shall be effective from the date of issuance until July 21, 2018, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within sixty (60) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150E of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611-7447. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information contact Malcolm Boney, or me at (910) 796-7215. Sinc ely, Ft/�c�/ . P� Edward Beck Regional Supervisor Surface Water Protection Section ENB/mb: S:\WQS\STORMWATER\PERMIT\080714 cc: Bryan Dick, Earth Tech Malcolm Boney, NCDENR Onslow County Building Inspections (Wilmington Regional Office Central Files concerning this matter, please None hCarolina 7 aturntty North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone (910) 796-7215 Customer Service Wilmington Regional Office Internet: www.newaterqualityore Fax (910)350-2004 1-877-623-6748 An Equal Opportunity/Affirmative Action Employer — 50 % Recycled110 % Post Consumer Paper State Stormwater Management Systems Permit No. SW8 080714 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY COMMERCIAL DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Carl Baker -Deputy Public Works Officer of MCB Camp Lejeune USMCB Camp Lejeune- Special Missions Training Center 1005 Michael Rd. Camp Lejeune, NC in Onslow County FOR THE construction, operation and maintenance of 1 infiltration basin(s) in compliance with the provisions of. Session Law 2006-246 and 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit. This permit shall be effective from the date of issuance until July 21, 2008, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.8 on page 3 of this permit. The stormwater control has been designed to handle the runoff from 10,800 square feet of impervious area. 3. This basin must be operated with a 50' vegetated filter. 4. The tract will be limited to the amount of built -upon area indicated in Section 1.8 on page 3 of this permit, and as shown on the approved plans. The built -upon area for the future development is limited to 0 square feet. 5. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. 6. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. Page 2 of 8 State Stormwater Management Systems Permit No. SW8 080714 The built -upon areas associated with this project shall be located at least 30 feet landward of all perennial and intermittent surface waters. The following design criteria have been permitted for the infiltration basin and must be provided and maintained at design condition: a. Drainage Area, acres: .71 Onsite, ft : .71 Offsite, ftz: 0 b. Total Impervious Surfaces, ftz: 10,800 Onsite, ft : 10,800 Offsite, ftz: 0 C. Design Storm, inches: 3.7 d. Basin Depth, feet: 2 e. Bottom Elevation, FMSI : 13 f. Bottom Surface Area, ft : 3,350 g. Bypass Weir Elevation, FMSy 15 h. Permitted Storage Volume, ft : 3006 i. Predevelopment 1 year 24 hour: 450cu.ft. j. Post -development 1 year 24 hour: 3447cu.ft. k. Type of Soil: Wando I. Expected Infiltration Rate, in/hr: 1.93 M. Seasonal High' Water Table, FMSL: 11.04 n. Time to Draw Down, hours: .29 o. :Receiving Stream/River Basin: New River / White Oak P. Stream Index Number: 19-(27) q. Classification of Water Body: "SA, HQW" II. SCHEDULE OF COMPLIANCE The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowin.9 and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of bypass structure, infiltration media, flow spreader, catch basins, piping and vegetated filter. g. A clear access path to the bypass structure must be available at all times. 4. Records of maintenance activities must be kept for each permitted BMP. The reports will indicate the date, activity, name of person performing the work and what actions were taken. Page 3 of 8 State Stormwater Management Systems Permit No. SW8 080714 5. The permittee shall submit to the Division of Water Quality an annual summary report of the maintenance and inspection records for each BMP. The report shall summarize the inspection dates, results of the inspections, and the maintenance work performed at each inspection. 6. The facilities shall be constructed as shown on the approved plans. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 7. 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. 8. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying.that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 9. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 10. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the ,drainage area. e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 11. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 12. 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. 13. The Director may notify the permittee when the permitted site does not meet one or more.of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. Page 4 of 8 State Stormwater Management Systems Permit No. SW8 080714 III. GENERAL CONDITIONS 1. This permit is not transferable to any person or entity except after notice to and approval by the Director. In the event of a change of ownership, or a name change, the permittee must submit a completed Name/Ownership Change form to the Division of Water Quality, signed by both parties, and accompanied by the appropriate documentation as listed on page 2 of the form. The approval of this request will be considered on its merits and may or may not be approved. 2. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 3. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. 4. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 5. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 6. The permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 7. The permit issued shall continue in force and effect until revoked or terminated. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 8. Unless specified elsewhere, permanent seeding requirements for the stormwater controls 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. The issuance of this permit does not prohibit the Director from reopening and modifying the permit, revoking and reissuing the permit, or terminating the permit as allowed by the laws, rules and regulations contained in Session Law 2006- 246, Title 15A NCAC 2H.1000, and NCGS 143-215.1 et. al. 11. The permittee shall notify the Division in writing of any name, ownership or mailing address changes at least 30 days prior to making such changes. 12. The permittee shall submit a permit renewal application at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate documentation and the processing fee. Page 5 of 8 State Stormwater Management Systems Permit No. SW8 080714 Permit issued this the 21st day of July 2008. NORTH CF ROLINA ENVIRONMENTAL MANAGEMENT COMMISSION foruoie'em1. z�,uums, uirector Division of Water Quality By Authority of the Environmental Management Commission Page 6 of 8 State Stormwater Management Systems Permit No. SW8 080714 MCB Camp Lejeune- Special Missions Training Center Stormwater Permit No. SW8 080714 Onslow County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL Page 7 of 8 State Stormwater Management Systems Permit No. SW8 080714 Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The bypass structure weir elevation is per the approved plan. 6. The bypass structure is located per the approved plans. 7. A Trash Rack is provided on the bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short- circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ Regional Office Onslow County Building Inspections Page 8 of 8 DWQ USE ONLY Date Received Fee Paid Permit Number —/-JS-c583�'1��c> S�sFI Jho?!' State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM Uns form may be photocopied for use as an original 1. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): MCB Camp Leieune 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Carl Baker Deputv Public Works Officer 3. Mailing Address for person listed in item 2 above: City: MCB Camp Lejeune State:NC Zip:28547-2521 Phone: (910 ) 451-2213 Fax: Email: carl.h.bakerQusmc.mil 4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): USMCB Camp Leieune - Special Missions Training Center (SMTC) 5. Location of Project (street address): City:Camp Leieune County:Onslow 6. Directions to project (from nearest major intersection): From Sneads Ferry go east on NC 172 though Lejeune Pate, turn rt at Horn Rd. at 6.5 miles, project site 7. Latitude: 34-35-52 N Longitude: 77-21-45 W of project 8. Contact person who can answer questions about the project: Name:Bryan Dick Telephone Number: (919-854-6252 ) Emait:brvan.dick@earthtech.com Il. PERMIT INFORMATION: 1. Specify whether project is (check one): ❑Renewal ❑Modification Form SWU-101 Version 8.07 Page I of 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit numberNA and its issue date (if known) 3. Specify the type of project (check one): ❑Low Density ®High Density ❑Redevelop ❑General Permit ❑Universal SMP ❑Other 4. Additional Project Requirements (check applicable blanks): ❑CAMA Major ❑Sedimentation/Erosion Control ❑404/401 Permit ❑NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Stormwater will be routed via grassed swales from imperivous areas to an infiltration basin. The infiltration basin meets DWO requirments for drawdown time and is sized for the required treatment volume. This project is withing 1/2 mile of SA (SC) waters. 2. Stormwater runoff from this project drains to the White Oak River basin. 3. Total Site Area:..85 acres 4. Total Wetlands Area: 0 acres 5. 100' Wide Strip of Wetland Area: NA acres (not applicable if no zoetlands exist on site) 6. Total Project Area**:.71 acres 7. Project Built Upon Area:37 % 8. How many drainage areas does the project have? 1 9. 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. Basin Information Drainage Area 1 Drainage Area 2 Receiving Stream Name New River Stream Class & Index No. SA, HQW Drainage Area (sf) 29200 Existing Impervious* Area (so 0 Proposed Impervious *Area (so 10800 % Impervious* Area (total) 37% Impervious* Surface Area Drainage Area 1 Drainage Area 2 On -site Buildings (sf) 7920 On -site Streets (so 0 On -site Parking (sf) 0 On -site Sidewalks (so 2880 Other on -site (so 0 Off -site (so 0 Total (sf): 10800 Form SWU-101 Version 8.07 Page 2 of 4 * Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. **Total project area shall be calculated based on the current policy regarding inclusion of wetlands in the built upon area percentage calculation. 10. How was the off -site impervious area listed above IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS One of the following 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. Form DRPC-1 High Density Commercial Subdivisions Form DRPC-2 High Density Developments with Outparcels Form DRPC-3 High Density Residential Subdivisions Form DRPC-4 Low Density Commercial Subdivisions Form DRPC-5 Low Density Residential Subdivisions Form DRPC-6 Low Density Residential Subdivisions with Curb Outlets By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required in the above form, 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 SW401-Low Density Form SW401-Curb Outlet System Form SW401-Off-Site System Form SW401-Wet Detention Basin Form SW401-Infiltration Basin Form SW401-Infiltration Trench Form SW401-Bioretention Cell Form SW401-Level Spreader Form SW401-Wetland Form SW401-Grassed Swale Form SW401-Sand Filter Low Density Supplement Curb Outlet System Supplement Off -Site System Supplement Wet Detention Basin Supplement Infiltration Basin Supplement Underground Infiltration Trench Supplement Bioretention Cell Supplement Level Spreader/Filter Strip/Restored Riparian Buffer Supplement Constructed Wetland Supplement Grassed Swale Supplement Sand Filter Supplement Form SWU-101 Version 8.07 Page 3 of 4 VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the interactive online map at httn://h2o.enr.state.nc.us/su/nisi mans.han 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form • Original and one copy of the Deed Restrictions & Protective Covenants Form • Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP • Permit application processing fee of $505 (54,000 for Express) payable to NCDENR • Calculations & detailed narrative description of stormwater treatment/management • Copy of any applicable soil report • Three copies of plans and specifications (sealed, signed & dated), 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) VII. 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): Bryan Dick, El, PH, Earth Tech Mailing Address: 701 Corporate Ctr. Dr., Suite 475 Phone: (919 ) 854-6252 Email:bryan.dick@earthtech.com VIII. APPLICANT'S CERTIFICATION State:NC Zip:27607 Fax: (919 ) 854-6259 I, (print or type name of person listed in General Information, item 2) certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective coy�nants will be r�jcorded, and that the proposed project complies with the requirements of 15A AC NC2H .1000 l b / n Signa Form SWU-101 Version 8.07 Page 4 of 4 Date: 7, _ v-9 P. 01 TRANSACTION REPORT JUL-22-2008 TUE 12:06 PM I I; t FOR: NCDENR 9103502004 SEND DATE START RECEIVER TX TIME PAGES TYPE NOTE M# DP I JUL-22 12:05 PM 919198546259 1'35" 9 FAX TX OK 891 TOTAL 1M 35S PAGES: 9 State of North Carolina Department of Environment and Natural Resources Wilmington Regional Office Michael R Easley, Governor FAX COVER SHEET Date:/���o�-��i To: Co:i Fax: Re- A Hard copy to follow v William G. Ross, Jr., Secretary No. Pages (excl. cover): g Express Permitting From:. Sandra Exum Phone: (910)796-7265 Fax: 127 Cardinal Drive Extension, Wilmington, NC 28405 9 (910) 796-7215 • An Equal Opportunity Affirmative Action Employer STORMWATER MANAGEMENT PLAN PREPARED FOR: MCB CAMP LEJEUNE SPECIAL MISSIONS TRAINING CENTER DATE: 7-1 4-08 EARTH TECH, INC 701 CORPORATE CENTER DR., SUITE 475 RALEIGH, NC 27607 919-854-6200 PREPARED BY: BRYAN M. DICK, EIT, PH CHECKED BY: J. W. JENKINS, PE Proiect Descriation This document is to serve as a stormwater management plan for the MCB Camp Lejeune — SMTC project. The project consists of the addition 5 temporary trailers, concrete slabs and sidewalks to the undeveloped site. The completed project will provide for expansion of base facilities to accommodate additional staff in the coming year. Contact Information Earth Tech, Inc. Attn: Bryan M. Dick, PH 701 Corporate Center Dr., Suite 475 Raleigh, NC 27607 Telephone: 919-854-6252 Fax: 919-854-6259 Identify Project Involvement This project is a part of the White Oak River Basin, and is currently not subject to any buffer rules. The site is approximately 4,500 feet from the New River and about 2,000 feet from Courthouse Bay, just outside of Sneeds Ferry, NC and is located in Onslow County, which is a Phase II — NPDES requirement county. The proposed project stormwater plan will meet the requirements of detaining the 3.7 inch rainfall event for a period of approximately 2 days, per the requirements by the State as referenced from the DWQ Stormwater Manual, July 2007. One infiltration basin is used to treat 1 drainage areas. This project is within 0.5 miles of SA waters and the use of infiltration devices is required by DWQ. The treatment volume provided as well as the use of swales and adequate infiltration capacity will provide a post development peak flow rate that is less than the pre -development condition, per the July 2007 start date for meeting Phase II requirements. Hydrocad models bases on TR-55 methods were used to validate the complete capture of the runoff difference for the 3.7" Type III — 24 Hr. storm. Stormwater Design Parameters The infiltration basins are based on the following parameters or objectives: • Provide 85% TSS removal • Protect the value of the receiving water resource • 3.7" rainfall for basin storage sizing • The 1 yr rainfall for outlet structure and routing design to maintain a post development peak flow that is less than pre -development peak flow • Ratio of impervious surface to the total area of the drainage area • Exceed a minimum of 2.0' clearance from the seasonal high water table • Rainfall exceeding the design storm will bypass the basins and flow through a minimum of 30' long vegetated filter Discussion of Treatment Measures The proposed treatment is to one infiltration basin to meet the TSS and Peak Flow requirements set forth by DWQ. The soils of the project site are appropriate soils for infiltration and the season high water table at the site will allow construction of the basin with at least a 2' of clearance. Bypass devices are provided to allow any runoff volume that exceeds the design storage volume to be routed to a level spreader with a vegetated filter strip. The level spreader length is designed to handle the 10 yr peak runoff rate, so no bypass of the filter is necessary. Phase II requirements are met by using a grassed swale to collect sheet flow from the impervious areas and by the infiltration and storage volume provided in each basin. Conclusion This Stormwater Management Plan represents an environmentally sensitive and effective plan for utilizing the proposed stormwater treatments to accommodate the increased runoff of the proposed site development. Check for Headwater Clearance Designer BMD Date: 7/13/2008 Basin # Qp 1 in/hr Hw 1 in/hr Op 10 yr Hw 10 Yr Clearence Check for (cfs) (ft) (cfs) (ft) Provide (B to C) Clearence 10 yr 1 0.40 0.22 1.01 0.41 0.80 ok Pre -development 9 Reach Aon Llnk 103543 SMTC Basin 1- Pre Type 1124-hr 1 yr Rainfall=3.70" Prepared by Earth Tech Page 2 HydroCAD@ 8.00 s/n 003562 © 2006 HydroCAD Software Solutions LLC 7/9/2008 Subcatchment 1S: Pre -development Runoff = 0.01 cfs @ 13.33 hrs, Volume= 0.006 af, Depth= 0.12" Runoff by SCS TR-20 method, UH=SCS, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs Type II 24-hr 1 yr Rainfall=3.70" Area (sf) CN Description 27,410 45 Woods, Poor HSG A 27,410 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 31.0 245 0.0400 0.13 Sheet Flow, sheet flow forest Woods: Light underbrush n= 0.400 P2= 3.70" Subcatchment 1S: Pre -development Hydrograph 0.01= 0.01 CfS ❑� Runoff 0 009- Type II 24-hr 1 yr Rainfall=3.70" 0.008 Runoff Area=27,410 sf ; 0.007- Runoff Volume=0.006'af 0.006-- Runoff Depth=0.12" 3 0.005- Flow Lengfh=245' ° FL0.004 :Slope=0.0400:'/' Tc=31.0 min 0.003= CN=45 ; 0.002' 0.001 , 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 Time (hours) 1S Pre-developmen 2P Infiltration Basin Drainage Diagram for 103543 SMTC Basin 1- Post subcat Reacn on Link Prepared by Earth Tech 7/9/2008 HydroCAD® 8.00 s/n 003562 © 2006 HydroCAD Software Solutions LLC 103543 SMTC Basin 1- Post Type // 24-hr 1 yr Rainfall=3.70" Prepared by Earth Tech Page 2 HydroCAD@ 8.00 s/n 003562 © 2006 HydroCAD Software Solutions LLC 7/9/2008 Pond 2P: Infiltration Basin Inflow Area = 0.670 ac, Inflow Depth = 0.86" for 1 yr event Inflow = 0.72 cfs @ 12.06 hrs, Volume= 0.048 of Outflow = 0.12 cfs @ 11.92 hrs, Volume= 0.048 af, Atten= 83%, Lag= 0.0 min Discarded = 0.12 cfs @ 11.92 hrs, Volume= 0.048 of Routing by Star -Ind method, Time Span= 0.00-96.00 hrs, dt= 0.01 hrs Peak Elev= 13.19' @ 12.57 hrs Surf.Area= 0 sf Storage= 571 cf Plug -Flow detention time= 33.1 min calculated for 0.048 of (100% of inflow) Center -of -Mass det. time= 33.1 min ( 918.8 - 885.7 ) Volume Invert Avail.Storage Storage Description #1 13.00' 3,006 cf Custom Stage Data Listed below Elevation Cum.Store (feet) (cubic -feet) 13.00 0 14.00 3,006 Device Routing Invert Outlet Devices #1 Discarded 0.00' 0.12 cfs Exfiltration at all elevations Discarded OutFlow Max=0.12 cfs @ 11.92 hrs HW=13.01' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.12 cfs) 103543 SMTC Basin 1- Post Type 11 24-hr 1 yr Rainfall=3.70" Prepared by Earth Tech Page 3 HydroCAD®8 00 s/n 003562 © 2006 HydroCAD Software Solutions LLC 7/9/2008 Pond 2P: Infiltration Basin Hydrograph o.s- 0.72 cfs Inflow Area 0.'670 ac 0.71 Peak Elev=13.19' 0.6= ' Storage=571 cf N 0.5= 3 0.4 004 0.3: 0.2 - 0.12 cfs 0.1= - . Time (hours) ❑p Inflow ❑■ Discarded 103543 SMTC Basin 1- Post Type 11 24-hr 1 yr Rainfall=3.70" Prepared by Earth Tech Page 4 HydroCAD®8 00 s/n 003562 © 2006 HydroCAD Software Solutions LLC 7/9/2008 Hydrograph for Pond 213: Infiltration Basin Time Inflow Storage Elevation Discarded (hours) (cfs) (cubic -feet) (feet) (cfs) 0.00 0.00 0 13.00 0.00 2.00 0.00 0 13.00 0.00 4.00 0.00 0 13.00 0.00 6.00 0.00 0 13.00 0.00 8.00 0.00 0 13.00 0.00 10.00 0.00 0 13.00 0.00 12.00 0.57 115 13.04 0.12 14.00 0.05 308 13.10 0.12 16.00 0.03 8 13.00 0.03 18.00 0.02 6 13.00 0.02 20.00 0.02 5 13.00 0.02 22.00 0.02 4 13.00 0.02 24.00 0.02 4 13.00 0.02 26.00 0.00 0 13.00 0.00 28.00 0.00 0 13.00 0.00 30.00 0.00 0 13.00 0.00 32.00 0.00 0 13.00 0.00 34.00 0.00 0 13.00 0.00 36.00 0.00 0 13.00 0.00 38.00 0.00 0 13.00 0.00 40.00 0.00 0 13.00 0.00 42.00 0.00 0 13.00 0.00 44.00 0.00 0 13.00 0.00 46.00 0.00 0 13.00 0.00 48.00 0.00 0 13.00 0.00 50.00 0.00 0 13.00 0.00 52.00 0.00 0 13.00 0.00 54.00 0.00 0 13.00 0.00 56.00 0.00 0 13.00 0.00 58.00 0.00 0 13.00 0.00 60.00 0.00 0 13.00 0.00 62.00 0.00 0 13.00 0.00 64.00 0.00 0 13.00 0.00 66.00 0.00 0 13.00 0.00 68.00 0.00 0 13.00 0.00 70.00 0.00 0 13.00 0.00 72.00 0.00 0 13.00 0.00 Time Inflow Storage Elevation Discarded (hours) (cfs) (cubic -feet) (feet) (cfs) 74.00 0.00 0 13.00 0.00 76.00 0.00 0 13.00 0.00 78.00 0.00 0 13.00 0.00 80.00 0.00 0 13.00 0.00 82.00 0.00 0 13.00 0.00 84.00 0.00 0 13.00 0.00 86.00 0.00 0 13.00 0.00 88.00 0.00 0 13.00 0.00 90.00 0.00 0 13.00 0.00 92.00 0.00 0 13.00 0.00 94.00 0.00 0 13.00 0.00 96.00 0.00 0 13.00 0.00 103543 SMTC Basin 1- Post Type // 24-hr 1 yr Rainfall=3.70" Prepared by Earth Tech Page 5 HydroCAD®8 00 s/n 003562 © 2006 HydroCAD Software Solutions LLC 7/9/2008 Elevation Storage (feet) (cubic -feet) 13.00 0 13.01 30 13.02 60 13.03 90 13.04 120 13.05 150 13.06 180 13.07 210 13.08 240 13.09 271 13.10 301 13.11 331 13.12 361 13.13 391 13.14 421 13.15 451 13.16 481 13.17 511 13.18 541 13.19 571 13.20 601 13.21 631 13.22 661 13.23 691 13.24 721 13.25 752 13.26 782 13.27 812 13.28 842 13.29 872 13.30 902 13.31 932 13.32 962 13.33 992 13.34 1,022 13.35 1,052 13.36 1,082 Stage -Area -Storage for Pond 2P: Infiltration Basin Elevation Storage (feet) (cubic -feet) 13.37 1,112 13.38 1,142 13.39 1,172 13.40 1,202 13.41 1,232 13.42 1,263 13.43 1,293 13.44 1,323 13.45 1,353 13.46 1,383 13.47 1,413 13.48 1,443 13.49 1,473 13.50 1,503 13.51 1,533 13.52 1,563 13.53 1,593 13.54 1,623 13.55 1,653 13.56 1,683 13.57 1,713 13.58 1,743 13.59 1,774 13.60 1,804 13.61 1,834 13.62 1,864 13.63 1,894 13.64 1,924 13.65 1,954 13.66 1,984 13.67 2,014 13.68 2,044 13.69 2,074 13.70 2,104 13.71 2,134 13.72 2,164 13.73 2,194 Elevation Storage (feet) (cubic -feet) 13.74 2,224 13.75 2,255 13.76 2,285 13.77 2,315 13.78 2,345 13.79 2,375 13.80 2,405 13.81 2,435 13.82 2,465 13.83 2,495 13.84 2,525 13.85 2,555 13.86 2,585 13.87 2,615 13.88 2,645 13.89 2,675 13.90 2,705 13,91 2,735 13.92 2,766 13.93 2,796 13.94 2,826 13.95 2,856 13.96 2,886 13.97 2,916 13.98 2,946 13.99 2,976 14.00 3,006 The Catena Group SOILS REPORT FOR STORM WATER BASINS Special Missions Training Center Camp Lejeune, NC Prepared For: EarthTech 701 Corporate Center Drive Suite 475 Raleigh, NC 27607 Prepared By: The Catena Group Hillsborough, North Carolina May 16, 2008 /) Gary S. Kreiser 410-B Millstone Drive Hillsborough, NC 27278 (919)732-1300 �'� S. K1-F� ^` aay /n :' 3Ya,• .y. F•^•'^Rl,t . INTRODUCTION The Marine Corps Base at Camp Lejeunc plans an expansion of the Special Missions Training Center. As part of this expansion, a stornnwater infiltration basin is proposed to infiltrate runoff from adjacent impervious surfaces. As part of the application process, a soils investigation detailing soil type, infiltration rate, and depth to seasonal high water table is required. The Catena Group, Inc (TCG) has been retained to perform the soil investigations. INVESTIGATION METHODOLOGY Prior to the field investigation, the Onslow County Soil Survey was referenced to get an overview of the possible soil series located in the study area. Around the site, there are two mapping units. Figure I presents the mapped soil series and the general location of the proposed infiltration basin where the borings and infiltration tests were performed. Table I presents the soil series, map unit symbol and taxonomic class. Table I Soil Series, Map Unit Symbol, and Taxonomic Class Map Unit Symbol Soil Series/Map Unit Name Taxonomic Class Ur Urban Land N/A WaB Wando Thermic, coated Typic Quartzipsamments The field investigation was performed on May 13, 2008- Soil borings were made with a hand-tumed auger in the vicinity of the proposed infiltration basins. Observations of the landscape (slope, drainage patterns, past use, etc.) as well as soil properties (depth, texture, structure, seasonal wetness, restrictive horizons, etc.) to a depth > 48 inches, when possible, were recorded. Soil color was determined with a Mansell Soil Color Chart. The rate of water entry into a soil is referred to as the infiltration rate. The infiltration rate into a soil decreases with time mainly due to an increase in the soil water content and a decrease in the hydraulic gradient. As infiltration continues, the rate of water entry into the soil reaches a constant value (steady state condition) which is considered to be the same as the saturated hydraulic conductivity (KSAT) of the soil. The KSAT was measured in the field and used to characterize the infiltration rate for the proposed infiltration basin. KSAT measurements were performed at the proposed infiltration basin using a constant -head permeameter (Amoozemeter). Before any readings were recorded, the Amoozemeter was allowed to equilibrate, typically 25 minutes. Based on conversations with the designer of the proposed infiltration basins (Mr. Bryan Dick of Earth Tech), construction of the basin would remove approximately 6 to 12 inches of topsoil. As such, the KSAT measurements were performed around a depth of 12 inches in order to estimate the infiltration rate at the new soil surface. FINDINGS Soil Type Based on the borings in the vicinity of the proposed basin, it was determined that the majority of the soil at the site was the Wando soil series. It appears that in this area, grading activities have taken place, with the soil having been cut or disturbed. However, it does not appear that any fill material was brought into this area. Detailed boring logs for each boring are attached. Table 2 presents each boring with a soil series determination. Determination of soil series was made through a comparison of soil boring descriptions to the Natural Resources Conservation Service (NRCS) Official Series Description (OSD) for the soil series that were mapped by the NRCS for this site. Table 2 Soil Borin s and Soil Series Determination Boring # Soil Series Determination I Wando 2 Wando Depth to Seasonal High Water Table During the field investigation, the depth to the seasonal high water table (SHWT) was determined. Since the soil was typically sandy, the determination of the SHWT was made through field indicators of redoximorphic features or the presence of saturated soil. Table 3 presents the soil borings and the determination of the SHWT. Table 3 Borimz and Depth to SHWT Boring # SHWT Determination (inches below Surface 1 36 2 36 Infiltration Rate Three (3) saturated hydraulic conductivity tests were performed at the proposed infiltration basin. The results for each test are shown below in Table 4. Data sheets for each hydraulic conductivity test are also attached. The geometric mean of the three tests was taken and is presented in Table 4. The geometric mean was calculated instead of the arithmetic mean, as it tends to dampen the effect of very high or low values, which might bias the arithmetic mean if a straight average was calculated. Table 4 Results of Saturated Hydraulic Conductivity Tests and Geometric Mean Test Location Test Number Test Depth (inches) Measured KSAT in/hr Geometric Mean (in/hr Basin 1 1 13.8 3.4 2.57 2 12.6 2.75 3 13.4 1.83 Since soil is inherently non -homogeneous, field tests can often misrepresent the areal hydraulic conductivity of a soil. Typically, field tests underestimate the saturated hydraulic conductivity of clayey soil and overestimate it in sandy soils. As a result of this misrepresentation a "moderation factor" is suggested to convert point saturated hydraulic conductivity to areal saturated hydraulic conductivity for each proposed infiltration basin. Since the soil is typically fine sand or loamy sand, a moderation factor of 0.75 was used to correct for the potential of overestimating the infiltration rate. Table 5 presents the saturated hydraulic conductivity geometric mean for each infiltration basin as well as a moderation factor to get an area infiltration rate for each proposed infiltration basin. Table 5 Geometric Mean, Moderation Factor and Areal Infiltration Rate for Proposed Basin Test Location Geometric Mean Moderation Factor Areal Infiltration Rate n/hr Basin l 2.57 0.75 1.93 As shown in Table 5, the proposed basin has an infiltration rate of 1.93 inch/hour which is greater than the required minimum of 0.52 inch/hour. CONCLUSIONS The findings presented herein represent TCG's professional opinion based on our site and soils evaluation. This report is provided to assist in the application for the infiltration basin by providing the soil information. North Carolina DWQ must issue the final permit. Any concurrence with the findings in this report would be made at that time. ORv t ;onville PN ?ASEADSP eG ?, F Camp Lejeune Main Gate 20 y ..nPVARD O ! IRCH 0 Camp Lejeune South Gate �o S FeProject Location rmy os z Miles I Bay GB, Lard00 - S �F I / P� SITE] Atlantic Ocean Legend @ EarthTech Location Map — PAVED AtgCC mxnwnMadd. Cwn m Special Missions Training Center UNPAVED Trailer Site Camp Lejeune Marine Corps Base Onslow County, North Carolina Wetlands and DWQ Legend 1 —UPLAND —Streams EarthTeeh Classifcation Map I I WETLAND Special Missions Training Center Existing Roads ® Shellfish Area HOW Atyco INneahauitLid P,rwy Trailer Site — PAVED rz� SheltBshArea ORW Camp Lejeune Marine Corps Base UNPAVED Onslow County, North Carolina 0 500 1,000 2,000 Feet I I 1 t t r 1 inch equals 1,000 feet 0 Z �<�a m 'o m C � w i C, m N o o o r 3 r�V o � ITI fl1 rt 3 n 0 n ` � a n m m o O 'o' N N Z= CD (n 0 S n D N Oo N Oco o N y (D N N SMTC 103543 - Infiltration Basin 1 Drain a Area (St 29200 Imp Area (sf) 10800 (A) Drainage Area (Ac) 0.67034 0A)Imp Fraction 0.37 (Ro)Rainfall Depth Per State SW P(In) 3.7 Step 1: Determine Runoff Volume Simple Method 6 V=3630xR„xRyXA Post Pre = Rv (post) _ .05+.9'.67 Rv (pre) = .05+.9'0 V=3630 '3.7'0.66 '.4237 V=3630 '3.7'0.05 '.4237 Designed By: BMD Date: 7/11/2008 0.38 0.05 V (post)= 3447 cf V (pre) = 450 cf Min. Treatment Vol(Post- Pre)= 2997 cf Treatment Vol in Ac-in 0.83 ac-in Step 2: Determine Surface Area- Min. lKI Infiltration Rate (in/hr) 1.93 (T) Into Days to Infiltrate (days) 2 a. V = A=3454/(2'(3.94'2)) Min SA of Basin = 388 at A= 2*(K*T) Step 3. Determine Dimensions ie Elevation 14.00 ion 13.00 Outlet to Basin Elev. 13.20 Max Excavation Depth O'Set Storage Depth Surface Area Required (Avg of Top and Bottom SA) Top Width @ Storage Elev 43.5 Bottom Width 37.5 Flow Splitter - Inlet Elevation Flow Splitter - Bypass Flow Outlet Elev Too of Berm Elevation 1.00 2997 Tar et Area 2995 st Top Length @ Storage Elev 77.0 Area Top of Storage = 3350 at Bottom Length 71-0 Area Bottom of Storage = 2663 at - Avg Surface Area = 3006 at Volume of Basin (Depth'SA) = 3006 cf 4. Calculation of Volumetric Flow Rate of Infitration and Drawdown D from infiltration: 'O is actually the Darden Fbw Rate Q=A (K) Cmmersion=cfs Erample Calculation of Q: Surfuce Area=4556.vf (K)=3.94 in/hr 3.94in I ft I hr 4556eJ =0.43 c%s hr 12in 3600x Drawdown Time for Treatment Volume ExampleCalculatim: Q=0.42cfr V=3458cf V 3458ft' Is Ihr — = T :.=2.Mrs =.089daps Q 1 0.42ft' 3600s Area (at) (K) ir✓hr D (infiltration) = 0.12 cfs 2663 1.93 Drawdown Time for Design Vol Volume cf O MMe Da a 3006 0.12 Fo 0.29 For DENR Use ONLY A North Carolina Department of Environment and Revii INA LL MANatural Resources submit i- 14 NCDENR Request for Express Permit Review Tame, rat 1 C3$5'r n Conlirm l [ -- FILL-IN all the information below and CHECK the Permit(s) you are requesting for express review. FAX or Ems _ _ - xpress - peieted: B Coordinator along with a completed DETAILED narrative site Plan IPDF file) and vicinity map (same items expected in the application package Deleted: 11 of the project location. Include this form in the application package. • Asheville Region -Alison Davidson 828-296.4698;alison.davidson(dncmail.net • Fayetteville or Raleigh Region -David Lee 919-791.4203; david.lee(imcmail.net • Mooresville & -Patrick Grogan 704-663.3772 or Patrick. wooan(o)ncmail.net • Washington Region -Lyn Hardison 252-946.9215 or Am.hardison(mncmail.not • Wilmington Region -Janet Russell 910-350-2004 or ianet.russelk5lncn il.npt NOTE: Project application received after 12 noon will be stamped in the following work day. I ,... Project Name: SMTC County: ONSLOW :�s Qe <`'p \ h ` SS ` o n S k T P, "" n Ck Applicant: ARL BAKER DEPUTY PUBLIC WORKS OFFICER Company: MCB CAMP LEJEUNE Aot-r Z o q c: v \ G v le—oA Ck Address: BLDG 1005 MICHAEL RD. City: MCB CAMP LEJEUNE, State: NC Zip:-285472521 Phone.910451-2213 Fax: Email: carlh.bakeridiusmc.mil Project is Drains into SA H W waters Project Located in WHITE OAK River Basin E ngineerlCm itanC Bryan M. Dick Company: Earth Tech Address: 701 COPORATE CENTER DR. City: RALEIGH, State: NO Zip: 27607 .. Phone: 919-854-6252 Fax::919.854-6259 Email: brvan.dick(diQmail,com - (Check all that apply) ❑ Scalping Meeting ONLY ❑ DWQ, ❑ DCM, ❑ DLR, ❑ OTHER: ❑ Stream Origin Determination: # of stream calls — Please attach TOPO map marking the areas in questions ❑ State Stormwater ❑ General ❑ Si ❑Bkhd & Bt Rmp, ❑ Clear & Grub, ❑ Utility ❑ Low Density ❑ Low Density -Curb & Gutter _ # Curb Outlet Swales ❑ OH -site [SW _(Provide permit #)I ❑ High Density -Detention Pond _ # Treatment Systems ® High Density -Infiltration 1 #Treatment Systems ❑ High Density -Bio-Retention _ # Treatment Systems ❑ High Density —Constructive Wetlands _ # Treatment Systems ❑High Density -Other _#Treatment Systems ❑MODIFICATION SW_ (Provide permit#) ❑ Coastal Management ❑ Excavation & Fill ❑ Bridges & Culverts ❑Structures Information ❑ Upland Development ❑ Marina Development - ❑ Urban Waterfront ❑ Land Quality ❑ Erosion and Sedimentation Control Plan with _ acres to be disturbed.(CK #_ (for DENR use)) WE TLA Nos QUESTIONS MUST BE ADDRESSED BELOW ❑ Wetlands (401): Check all that apply Isolated wetland on Property ❑ Yes ❑ No Wetlands on Site ❑ Yes ❑ No Buffer Impacts: ❑ No ❑ YES: acre(s) Wetlands Delineation has been completed: ❑ Yes ❑ No Minor Variance: ❑ No ❑ YES US ACOE Approval of Delineation completed: ❑ Yes ❑ No Major General Variance ❑ No ❑ YES 404 Application in Process wl US ACOE: ❑ Yes ❑ No 401 Application required: ❑Yes ❑ No If YES, ❑ Regular Permit Received from US ACOE ❑ Yes ❑ No Perennial, Blue line stream, etc on site ❑ yes ❑ No For DENR use only SUBMITTAL DATES Fee SUBMITTALDATES Fee CAMA $. Variance JLJ Ma' Min $ SW 0HID, ❑LID, peen $ 401: $ LDS $ Stream Deter,_ 1 $ k4 a,r ISM C E rG P)1 JUL U 8 2008 DSV C Pagel of 2 CLJN.CLJN.jurisdictional_wetiand_area SDE Feature Class Description I Spatial I Attributes Keywords Theme: Wetlands Area, Location Place: Camp Lejeune Stratum: wetlands, planning, jurisdictional Temporal: None Description Abstract CUN.CUN.jurisdictional_wetland—area contains polygons representing wetlands created from the Jurisdictional Wetlands obtained from field survey and approved by the Corps of Engineers, Wilmington, NC. Purpose Provide wetlands identification as it relates to planning, construction siting and management tasks. Supplementary Information CUN.CUN.jurisdictional_wetland—area created from feature class CUN.CUN.wetland_area New feature class 2006 Status of the data Complete - Last Reviewed: 10/17/06 Data update frequency: As needed Time period for which the data is relevant Date and time: 2005 Description: REQUIRED: The basis on which the time period of content information is determined. Publication Information Who created the data: I&E/EMD/ECON Date and time: REQUIRED: The date when the data set is published or otherwise made available for release. Data storage and access information File name: CUN.CUN.jurisdictional_wetland_area file://CADocuments and Settings\lan.Jewell\Local Settings\Temp\metadata3.htm 2/8/2008 Page 2 of 2 Type of data: vector digital data Location of the data: • \\mcbclnasOl \GIS_User_Storage\Lejeune\BLS D\GIS\ECRGCInsta IlationData\Lejeune\Data Req uests\: \081007 Earth Tech\New Personal Geodatabase.mdb Data processing environment: Microsoft Windows 2000 Version 5.2 (Build 3790) Service Pack 1; ESRI ArcCatalog 9.1.0.780 Constraints on accessing and using the data Details about this document Contents last updated: 20070814 at time 09133300 Who completed this document Standards used to create this document file://C:\Documents and Settings\lan.Jewell\Local Settings\Temp\metadata3.htm 2/8/2008