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SW8080510_HISTORICAL FILE_20080530
STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 Q$ 0 510 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE 2008 05 30 YYYYMMDD Michael F. Easley, Governor William G. Ross Jr, Secretary North Carolina Department of Environment and Natural Resources Coleco 11, Sullins Director Division of Water Quality May 30, 2008 Carl Baker, Deputy Public Works Officer United States Marine Corps 1005 Michael Rd Camp Lejeune, NC 28574 Subject: Stormwater Permit No. SW8 080510 FRC Maintenance Facility at MCAS New River, Camp Lejeune High Density Project Onslow County Dear Mr. Baker: The Wilmington Regional Office received a Stormwater Management Permit Application for FRC Maintenance Facility at MCAS New River on May 14, 2008 with additional information submitted on May 27, 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 080510 dated May 30, 2008, for the construction of the subject project. This permit shall be effective from the date of issuance until May 30, 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. Please note that stormwater runoff from the built -upon area on the west side of the FRC Maintenance Building, in the drainage area #43, will be treated by a modification when the future hangar is built due to site drainage/elevation limitations. 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 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 yo ve any questions, please contact M.J. Naugle or me at (910) 796-7215. Sin (3e&k Edward Beck Regional Supervisor Surface Water Protection Section ENB/mjn: S:\WQS\STORMWATER\PERMIT\080510 may08 cc: K. Joshua Hurst, PE, Clark Nexsen Onslow County Building Inspections Onslow County Engineering Department Onslow County Planning Department No` thCarolina Wilrniragfdn_Regional Office, -Central Files, M.J. Naugle A Wura//ll North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone (910) 796-7215 Customer Service Wilmington Regional Office Internet: www.newaterquality ore 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 080510 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 Carl Baker, Deputy Public Works Officer and US Marine Corps FRC Maintenance Facility at MCAS New River Campbell & White & Foster Streets, Camp Lejeune, Onslow County FOR THE construction, operation and maintenance of two sand filters in compliance with the provisions of 15A NCAC 2H .1000 and the Session Law 2006-246 and (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 May 30, 2018, 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 1.6 on page 3 of this permit. The stormwater control has been designed to handle the runoff from 17,631 square feet of impervious area. 3. This basin must be operated with a 30 foot vegetated filter. The tract will be limited to the amount of built -upon area indicated on page 3 of this Permit, and per approved plans. There is no built -upon area for the future development allocated in this permit. Any additional BUA will require a modification of this permit. The BUA on the west side of the FRC Maintenance Building in the drainage area #43 will be treated by a modification when the future hangar is built due to site drainage/elevation limitations. 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 7 State Stormwater Management Systems Permit No. SW8 080510 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 Carl Baker, Deputy Public Works Officer and US Marine Corps FRC Maintenance Facility at MCAS New River Campbell & White & Foster Streets, Camp Lejeune, Onslow County FOR THE construction, operation and maintenance of two sand filters in compliance with the provisions of 15A NCAC 2H .1000 and the Session Law 2006-246 and (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 May 30, 2018, and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.6 on page 3 of this permit. The stormwater control has been designed to handle the runoff from 17,631 square feet of impervious area. 3. This basin must be operated with a 30 foot vegetated filter. 4. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans. There is no built -upon area for the future development allocated in this permit. Any additional BUA will require a modification of this permit. The BUA on the west side of the FRC Maintenance Building in the drainage area #43 will be treated by a modification when the future hangar is built due to site drainage/elevation limitations. 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 7 State Stormwater Management Systems Permit No. SW8 080510 The following design criteria have been permitted for the sand filters and must be provided and maintained at design condition: Sand Filter Number #1 & 2 same None Drainage Area Name DA-1 & 2 DA-23 a. Drainage Area, acres 0.184 each 0.52 Onsite, ft. 7989 each 22,651 Offsite, ft None None b. Total Impervious Surfaces, ft 7989 1653 c. Design Storm, inches 1.5 N/a d. Sedimentation Basin Surface Area, ft 99 N/a e. Sand Filter Surface Area, ft2 99 N/a I. Inside Bottom Elevation, FMSL 18.22 N/a g. Bypass Weir Elevation, FMSL 21.47 N/a h. Permitted Storage Volume, ftj 949 N/a i. Type of Soil Engineered Sand N/a . Expected Infiltration Rate, ft/day 3.5 N/a k. Time to Draw Down, hours <40 N/a I. Receiving Stream/River Basin Stick Creek/ Lumber m. Stream Index Number 19-15 n. Classification of Water Body SC:HWQ,NSW It. 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. 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 re -vegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of 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. 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. The facilities shall be constructed as shown on the approved plans. This permit shall become void unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 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. Page 3 of 7 State Stormwater Management Systems Permit No. SW8 080510 Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 8. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 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 any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 10. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 11. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. 12. The Director may notify the permittee when the permitted site does not meet one or more of the minimum requirements of the permit. Within the time frame specified in the notice, the permittee shall submit a written time schedule to the Director for modifying the site to meet minimum requirements. The permittee shall provide copies of revised plans and certification in writing to the Director that the changes have been made. III. GENERAL CONDITIONS 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. Page 4 of 7 State Stormwater Management Systems Permit No. SW8 080510 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 may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and re -issuance or termination does not stay any permit condition. 8. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 9. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 10. The permittee shall notify the Division in writing of any name, ownership or mailing address changes within 30 days. Permit issued this the thirtieth day of May 2008. T COMMISSION Division of Water Quality By Authority of the Environmental Management Commission Page 5 of 7 State Stormwater Management Systems Permit No. SW8 080510 FRC Maintenance Facility at MCAS New River, Camp Lejuene Stormwater Permit No. SW8 080510 Onslow County Designer's Certification I, , as a duly registered North Carolina, having been authorized to observe construction of the project, (Project) for in the State of (periodically/ weekly/ full time) the 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 6 of 7 State Stormwater Management Systems Permit No. SW8 080510 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 7 of 7 i DWQ USE ONLY Date Received Fee Paid Permit Number 5 08 000. -1,,-, 4 0 S 0 S I C) 312tot AD INIF0 il-, tf$3t�8 State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM 77ris farm may be photocopied for use as an original I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): United States Marine Corps, Camp Lejeunc, North Carolina 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Carl Baker (Deputy Public Works Officer, Marine Corps Base, Camp Lejeunc) 3. Mailing Address for person listed in item 2 above: City: Camp Lejeune State: NC Zip: 28574 Phone: (910 ) 451-2213 Fax: (910 ) 451-2927 Email: carl.h.bakerQusmcmil 4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): MCAS NEW RIVER - FRC MAINTENANCE FACILITY 5. Location of Project (street address): CAMPBELL STREET TO THE NORTH, WHITE STREET TO THE WEST, FOSTER STREET TO THE EAST City: IACKSONVILLE County: ONSLOW Zip: 28547 6. Directions to project (from nearest major intersection): FROM ROUTE 17 TURN LEFT ONTO CURTIS RD, ONTO NEW RIVER AIR STATION, THEN RIGHT ONTO BANCROFT STREET, FINALLY A LEFT ONTO CAMPBELL STREET 7. Latitude: 34' 43' 04" N Longitude: -77' 26' 43" W of project 8. Contact person who can answer questions about the project: Name:K. Joshua Hurst, PE Telephone Number: (919 ) 828-1876 Email:Jhurst@clarknexsen.com II. PERMIT INFORMATION: RECEIVED Form SWU-101 Version03.27.08 Page I of MAY 1 4 2008 BY: C - (. 1: Specify whether project is (check one): ®New ❑Renewal ❑Modification 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number 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; information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748): ❑LAMA Major ❑Sedimentation/Erosion Control ❑404/401 Permit ❑NPDES Stormwater 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. The stormwater running off the proposed building will be treated by outfalling the downspouts into two sand filter chambers that discharge to a grass swale that flows to a level spreader and filter strip. 2. Stormwater runoff from this project drains to the New River basin. 3. Total Property Area: 1.29 acres 4. Total Wetlands Area: na acres 5. 100' Wide Strip of Wetland Area: na acres (not applicable if no eoetlands exist on site) 6. Total Project Area**:1.29 acres 7. Project Built Upon Area:45.7 % 8. How many drainage areas does the project have?3 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. For hieh densitv proiects, complete the table with one drainage area for each engineered stormwater device. Basin Information- Drainage Area 1 Drainage Area 2 Receiving Stream Name Stream Class & Index No. Total Drainage Area (so On -site Drainage Area (so Off -site Drainage Area (so Existing Impervious* Area (so Proposed Impervious*Area (so see attached summary see attached summary % Impervious* Area (total) Impervious* Surface Area Drainage Area 1 Drainage Area 2 On -site Buildings (so On -site Streets (so On -site Parking (so On -site Sidewalks (so Other on -site (so Off -site (sf) Total (so: Form SWU-101 Version 03.27.08 Page 2 of 4 l�t wm Basin Information DA-1 DA-2 DA-23 DA-30 DA-32 DA 43 DA-48 Receiving Stream Name Stick Creek Stream Class & Index No. Class: SC;HQW,NSW Index No: 19-15 Drainage Area (so 79891 7989 22651 25048 146961 25779 20228 Existing Impervious Areas 31541 7849 5776 25048 13199 10896 20228 Proposed Imervious Areas 7989 7989 1653 25048 13199 7578 20228 % Impervious Area (total) 100% 100% 7% 100% 90% 29% 100% y =:,�„ 777'; ; , a'.- Y _ f, , ;., .-,fin- x 1 '#' :- ..,. --'� - r .. ._ ,. x T, -g _ 4•._6 �-xC _. it,7' 'f 'M1' Impervious Surface Area .v..,y - i, x . .£4 44. ?F On -site Building s 7989 7989 0 0 0 103 0 On -site Streets s 0 0 0 0 0 0 0 On -site Parkin s 0 0 0 25048 13199 7475 20228 On -site Sidewalks s 0 0 1089 On -site ads/sandfilters 0 0 564 Off -sites 0 0 0 0 0 01 0 Totals 79891 79891 16531 250481 131991 75781 20228 * 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. This is the area used to calculate percent project built upon area (BUA). 10. How was the off -site impervious area listed above derived?derived from cad files 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. Forms can be downloaded from htto://h2o.enr.state.nc.us/su/bmp forms.htm - deed restrictions. Form DRPC-1 High Density Commercial Subdivisions Form DRPC-2 High Density Developments with Outparcels Form DRPC-3 High Density Residential Subdivisions Form DRPC4 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. Forms can be downloaded from httn://h2o.enr.state.ne.us/so/bmp forms.htm. 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-I-evel Spreader Form SW401-Wetland Form SW401-Grassed Swale FormSW401-Sand Filter Form SW401-Permeable Pavement 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 Permeable Pavement Supplement Form SWU-101 Version 03.27.08 Page 3 of 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 httti://h2o.enr.state.ne.us/suhnsi ntaps.htm) 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. II 'tials Original and one copy of the Stormwater Management Permit Application Form • Original and one copy of the Deed Restrictions &Protective Covenants Form (if required as per Part IV above) • Original of the applicable Supplement Form(s) and O&M agreement(s) for each BMP • Permit application processing fee of $5d5 (Express: S4,000 for HD, $2,000 for LD) payable to NCDENR • Calculations & detailed narrative description of stormwater treatment/management • Copy of any applicable soils report • Two 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) VIL AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. (ex. designing engineer or firm) Designated agent (individual or firm):K. Joshua Hurst, P.E., c/o Clark Nexsen Mailing Address:4000 Westchase Boulevard, Suite 280 Phone: (919 ) 828-1876 Email: i h urs t�cl arknexsen.com VIII. APPLICANT'S CERTIFICATION State:NC Zip:27607 Fax: (919 ) 828-1877 1, (print or type name of person listed in General Infortnation, item 2) Carl Baker 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 n nts will be rj rded, and that the proposed project complies with the requirements of 15A and protective co} NCAC 2H .10(0. J Form SWU-101 Version 03.27,08 Page 4 of 4 Date: 5—' 6 X t P. 01 TRANSACTION REPORT t t JUN-02-2008 MON 08:00 AM FOR: NCDENR 9103502004 SEND DATE START RECEIVER TX TIME PAGES TYPE NOTE M# DP K JUN-02 08:00 AM 919198281876 0 FAX TX BUSY 515 TOTAL OS PAGES: 0 t � State of North Carolina Department of Environment and Natural Resources Wilmington Regional Office Michael R Easley, Governor William G. Ross, Jr., Secretary FAX COVER SHEET Date: June 2, 2008, No. Pages (exel. cover): 7 Express Permitting To: K. Joshua Hurst PE From: Sandra Exum Cc: Clark Nexsen Phone: (910)796-7265 Fax: 919-928-1876 Fax: (910)350-2004 Re: Express Permit for FRC Maintenance Facility at MCAS Hard copy to follow - 127 Cardinal llrive Extension, Wilmington, NC 28405 . (910) 796-7215 9 An Equal Opportunity Affirmative Action Employer Engineering Mav � � 2ooe Project: FRC Maintenance Facility at MCAS New Reber NCDEATR Stormwater Project No. SI178 090510 Submittal: 3tormwater Expreff Review Date of Submittal: May 27, 2008 6160 Kempseille Circle, Suite 200A Location: Onslow, ITC Norfolk, Viginia 23502 CN Ref. No.: N2496.2 7571455-5800 Fax 7571455-5638 hitp: //wmw.clarknexien. com Below are NCDENR's comments and Clark Nexsen's responses to the stormwater review of P-1184 Dining Facility at Stone Bay MCB Camp Lejeune. NCDENR's comments are fisted first, followed by our response in italics. 1. Please report consistent values for built -upon area on the application and plans. The BUA reported on plan #C-104 differs from the values included on the application table. C-104 reports total proposed BUA of 25,605.17 square feet and the application table reports proposed total of 17,631 sf. Report all BUA within the drainage areas delineated on plans C-104 and DA-2 on both tables in the application and the plans. The application table reports greater bua proposed than existing, yet in the meetings on April 23 and May 7, the project was stated as proposing less BUA. Response: The original BUA areas shown on C104 were bared offproject limits, versus the application summary sheet it based off drainage areas. In order to be consistent throughout the package we've updated the values shown on C104 to reflect the drainage areas. 2. Verify the treatment volume on the sand filters. The volume to treat is reported as 899 cubic feet, whereas the calculated volume in accordance with the bmp should be closer to 950 cu ft. j\:tQV sch = 3630 RdRvAtotal] Response: The treatment volumes for the sand feller have been updated to accommodate the port construction IY/Q V of 950 ceeft, as darifzed in your email response sent on May 21, 2008. 3. Verify the surface area provided of each sand filter chamber. The supplement and calculations report 100 sf, yet the plans delineate an area 18 x 5 = 90 sf due to the bypass weir/outlet. Provide an off fine bypass prior to the sediment chamber as required in the bmp for flow splitter, thus increasing the treatment area/volume in the media chamber. Response.- The supplement has been updated to reflect the number provided with the calculations and shown on the plans. The off-line bypass will be revised 4. Label the plans with the engineer name, firm, and address. Although a PE stamped the plans, no firm name or address were included. Response: The engineer name, firm, and address have been added to the plan on sheet C102. This project is a NAVFAC project wbich does not allow us to modify the title block provided by !be federal Government. J:\jobs\2496-FRC blaint Fac-DFW\5 Discipline Filcs\Civil\ncdenr submittal\comment response\2008-05-21 NCDENR Stounwater Comments Response i\lemo.doc Page 1 of 2 Page 1 Anbitecture & Engineering Project: f RCMaintenance Facility at MCAS New River NCDENR Stornwater Project No. S W78 080510 Submittal: SlomrwaterExpress Review Date of Submittal: May 27, 2008 5. Please verify the bypass is provided for the volume in excess of the design storm. The supplement states no, yet a weir is detailed on plan C107. Response: The bypass weir provided as part of tbe bmp structure was .rued for a 100year storm and was provided at the elevation above the sand filter weir depth elevation. The supplement will be updated to reflect the bypass weir design as part of the structure. 6. Correct the level spreader detail on C106 for the outlet from a swale. The section detail and notes currently report information to collect runoff from a basin. Response: The level spreader detail on C106 hat been revised to specify 'Crass Swale"rather than 'Emegeng Spillway "and Inside Slope of the Basin. " 7. Submit $500 fee for additional information required in the express program. Response: A S500 cheek has been included with this submittal. (.i �8 3T ✓ / 8. Please note that a revision to one number may have a domino effect on other numbers, which may require revision of the applications, calculations, supplements, plans, details, and associated documentation. Please verify all numbers are correct to ensure consistency in the appficadon documents. Response: Noted! J:\jobs\2496-FRC Maint Fac-DEN\5 Discipline Files\Civil\ncdenr submittal\comment response\2008-05-21 NCDENR Stormwater Comments Response Memo.doc Page 2 of 2 Page 2 A rt%rtarure & E Tanmv� g VD To: NCDENR Date: 6160 Kmpzge Cirde, Suite 200A Nafclk, Virginia 23502-3945 7571455-5800 Fax 7571455-5638 http:11uuw dank=sen can We transmit Attn: Mary Jean Naugle 127 Cardinal Drive Extension Wilmington, 28405 G Project No: 2496.2 Reference: SW8080510 FRC Maintenance Facility ❑ herewith ® in accordance with your request ❑ under separate cover For Your ® approval ❑ distribution to parties ❑ review and comment ❑ record ❑ use ❑ information The Following ® drawings ❑ computer file(s) ❑ specifications ❑ samples ❑ change order ❑ product literature ❑ shop drawings ® calculations Copies Date Description 2 5/23/08 Revised sheets (C102, C104, C106, C107) 1 5/23/08 Revised Supplements, narrative, summary sheet, and calculations (�-D l C—Ee q� 5M , r C -K +a S I'm resubmitting the entire calculations package to eliminate having to tear apart the old booklet and slip sheet everything. Please let me know d you require any additional information to complete your review. By: Jeffrey J. Bass MAY 2 7 2008 Copies to: files Cfias in Norfolk, Ridmar4 Akxandria, Rav7&e, O.arlateaniRako A P*,ionl Capmrzm Docu ent2 r, RECFTVED MAY 2 7 2008 BY;� o Stormwater Submittal 23 May 2008 FRC Maintenance Facility �N CARo�""'` New River Air Station, NC issI el, Engineer (s): K. Joshua Hurst, P.E. Jeffrey J. Bass W 33574 Architecture & Engineering CN Comm. No.: N2496 2 MCAS New River Jacksonville, NC MCON P-681 Fleet Readiness Center Maintenance Facility NARRATIVE Project Description The purpose of this project is to construct a single story maintenance facility to provide work spaces in support of the establishment of the Fleet Readiness Center East Site New River. Other site work will include land grading, various asphalt and concrete areas, and laterals for both domestic water and sanitary sewer. This project will meet minimum anti -terrorism force protection standards. Approximately 1.29 acres, of a 2.86 acres of a drainage area, will be disturbed during this construction period. The site is located in Jacksonville, North Carolina at the New River Marine Corps Air Station off of U.S. 17. The project site is located in the New River watershed. Stormwater runoff currently flows north to a drainage ditch that flows to a 12- inch culvert that flows west. It is the intent of the project to reduce the amount of existing impervious surface located within the project limits, and redevelop the existing area. Site Description The Maintenance Facility site is located to the northeast of the overall New River site. The project site is located along the north side of the concrete aircraft parking apron, west of existing maintenance hangar AS504 and is within the flight line secured perimeter fence, with access to authorized personnel only. The site currently consists of a mix of bituminous concrete pavement and grass. The nearest streets are Foster Street to the east, Campbell Street to the north and White Street to the west. The site slopes to both the north and the south, with the drainage divide located approximately at the edge of the airfield. The topography of the site is generally flat with a high of approximately 20 feet to the southeast and a low of approximately 16 feet running along the grassed drainage ditch to the north of the site. There is no evidence of significant erosion under present site conditions. Adjacent Property The property to the north, east, south and west of the construction site are within the New River Marine Corps Air Station. An airfield is located to the south, Building AS502 (firehouse) to the north, maintenance hangar AS504 to the east and a grassed area to the west. The new construction will have a similar use to that of the support buildings currently located on the site. SAND FILTER 1 SC WATERS Post Development Ad= t.;Tyria r;;=`'0:183 Ac la= 1.000 Rv= 0.950 Rd= 1.5 inches V 948.68236 tuft Total Vol. Requried(V)= 948.7 cult WQV = 949 cult Step f WQVadj = WQV '(0.75) WQVadj = 711.75 cuft Step 2 Determine the minimum surface area for both the sediment chamber and sand filter. ha= hmaxfiiter / 2 hmaxnter is the total depth over the sand filter hmaxf,ter= 3.6 ft ha= 1.8 ft Step 3 hmaxeuer =WQVadj / (As + At) As = [ 240 ' Rv 'Ad] Rd As = 62.723 sqft Minimum surface area of the sediment chamber Af = (WQV ' df) / [(k)'(t)'(ha + df)) df=1.5 k=3.5 ft/day t=1.66 days Af = 74.245 sqft Minimum surface area of the sand filter Dimensions for this design Sand filter Width 5.5 ft Length 18 ft Sediment Chamber Width 5.5 ft Length 18 ft As= 99 sqft Af= 99 sqft WQVadj = 711.75 (As + Af) ' hmaxeiter >= WQVadj 712.8 >= 711.75 Dimensions are greater than Min surface area - Okay Dimensions are greater than Min surface area - Okay Design Volume is greater than WQVadj - Okay Step 4 See details of sand filter structure in relation to easy of maintenance and access for cleaning SAND FILTER 2 SC WATERS Post Development Imp. A --,Ol83Ac la= 1.000 Rv= 0.950 Rd= 1.5 inches V 948.68235 cult Total Vol. Requried(V)= 1 948.7 tuft WQV = 949 tuft Step 1 Step 2 Step 3 WQVadj = WQV '(0.75) WQVadj = 711.75 cult Determine the minimum surface area for both the sediment chamber and sand filter. ha= hmaxfiRer 12 hma=eite, is the total depth over the sand filter hmacfilter= 3.6 ft ha= 1.8 ft hmaAlter =WQVadj / (As + Af) As = f 240' Rv'Adl Rd Af = (WQV - df) / [(k)`(t)'(ha + do) df=1.5 k=3.5 ft/day t=1.66 days Af = 74.245 sqft Minimum surface area of the sand filter Dimensions for this design Sand filter Width 5.5 ft Length 18 ft Sediment Chamber Width 5.5 ft Length 18 ft As= 99 sqft Af= 99 sqft WQVadj = 711.75 (As + Af) ` hmaxeuer >= WQVadj 712.8 >= 711.75 Dimensions are greater than Min surface area - Okay Dimensions are greater than Min surface area - Okay Design Volume is greater than WQVadj - Okay Step 4 See details of sand filter structure in relation to easy of maintenance and access for cleaning I mom- c00�/,FuU X_ T13 a IN]a Architecture & Engineering -] ARCHITEC I U101, LIMECHANICAL MCIVIL Ci FLEC-1 HICAL I SIRUC-I'LIRAL 7, DATV — 5 19, __ —COMilt BY COMM. No., 2l bq _CHECKED BY F?( )Ifi•"I I vj�IJ(� " r i 4 - 'SI I [:,[;*I NO. / to _sfiF.F,-is ,Level sf*e I ei4i, st"P -A(, C' 411C4 =j" A, 2, L,), 4, r a j5;z = 6L W ac- v, (o.z5mo,62� 0,53L, -r.- = 5 m #IT, LY = C 14 7,il4r 59) ( 7. o) (a. s&) 32- trs 1m,0 2 1 MI CIA 2 qivr -ba5cj OA M fn C?tw foqo(q)emq)= 15�, CR 131fas5 nech � be- �,'W_ Or Ille ei(S t-0 a mloimU.,r„ of f'P A r4es e-4 ged-.-w,4' cm 41.,t /A r *prw'A+i� DF5Mgo&S .96t W;f, c+M,Rbw myo -h. C Weir Report Hydraflow Express Extension for AutoCAD& Civil 3D® 2008 by Autodesk, Inc. Monday, May 12 2008 WEIR CALCULATIONS INTO SANDFILTER 1 & 2 FROM SEDIMENT CHAMBER Rectangular Weir Crest = Sharp Bottom Length (ft) = 1.00 Total Depth (ft) = 0.35 Calculations Weir Coeff. Cw = 3.33 Compute by: Known C Known Q (cfs) = 0.68 Depth (ft) 1.00 0.50 M0 -0.50 Highlighted Depth (ft) = 0.35 Q (cfs) = 0.680 Area (sqft) = 0.35 Velocity (ft/s) = 1.96 Top Width (ft) = 1.00 WEIR CALCULATIONS INTO SANDFILTER 1 & 2 FROM SEDIMENT CHAMBER Depth (ft) 1.00 0.50 M -0.50 Weir W.S. Length (ft) Weir Report Hydraflow Express Extension for AutoCAD® Civil 3D® 2008 by Autodesk, Inc. WEIR CALCULATIONS FOR BYPASS DEVICE Rectangular Weir Crest = Sharp Bottom Length (ft) = 2.00 Total Depth (ft) = 0.40 Calculations Weir Coeff. Cw = 3.33 Compute by: Known Q Known Q (cfs) = 1.54 Depth (ft) 1.013 0.50 M -0.50 Highlighted Depth (ft) Q (Cfs) Area(sgft) Velocity (fUs) Top Width (ft) WEIR CALCULATIONS FOR BYPASS DEVICE Monday, May 12 2008 = 0.38 = 1.540 = 0.75 = 2.04 = 2.00 Depth (ft) 1.00 0.50 M CI)(.'111 0 .5 1 1.5 2 2.5 3 Weir W.S. Length (ft) Weir Report Hydraflow Express Extension for AutoCAD® Civil 3D® 2008 by Autodesk, Inc. Level Spreader Weir Velocity Rectangular Weir Crest = Sharp Bottom Length (ft) = 43.16 Total Depth (ft) = 0.60 Calculations Weir Coeff. Cw = 3.33 Compute by: Known C Known Q (cfs) = 3.32 Depth (ft) t.00 0.50 M -0.50 Highlighted Depth (ft) Q (cfs) Area(sgft) Velocity (fft/s) Top Width (ft) Level Spreader Weir Velocity Monday, May 12 2008 = 0.08 = 3.320 = 3.50 = 0.95 = 43.16 Depth (ft) 1.00 0.50 M -0.50 Weir W.S. Length (ft) APPENDIX C SHEET 6 OF 8 on .■■.■■� Sol Lfts ga4a\���`�-_tvl�_ ttitit�itittlt�tp c�me mru►".—qm I��r �r t MEMEWLM MOM M milli • , t�ittr���lt —� w� tisi�ttt�tti�t���� �7►pA�\A IIIIIU� �11�11�� Orem ■■■ON In►��.�����■�� /e•it�pt��t� ttt�aa�►-�►�a r i CHART C 200.7 S,n h POINT PRECIPITATION ,'. FREQUENCY ESTIMATES FROM NOAA ATLAS 14 North Carolina 34.672 N 77.456 Ci' 9 feet lio,a "a n, %,I,, ,I 'he u:dla $U11- NOAA :„in, I.I. e;,in�ne;. cerv.,n G.M. n„mm, 1). Rl:u:in, It Lin. I IbrnhA,;\LYc1u.:nd 0. Rd- NI)AA, N:nl:nui a'e:nhe, 4,nire. Silva, Fx mends Fri Fcl:, ]oe3 t __••••-�••��.,,,,,.� 11 ora,unda,y �( �ocauonMaps I�OtherInfo, �� GISdata i" h4aps Help FPrecipitation Frequency Estimatei (inches)1204, 10 �0 3 hr fi hr 12 hr 24 hr 48 hr ❑[lay 3U I60� 0.49 078 098 1.34 min LG72.032.19 dac dap j day 2.6G 3.14 3.jS4.17 E6r, 5,41 '6.06 8.10 day it day Jar 994 12.46 15.09 0.5S 0.- 1.16 -61 2.02 2.46 2.66 3.23 3.81 4.3G 5.05 �,63 6.52 ,7.27 9.G4 I i.S0 14.?3 19.80 C� 0.6 i L07 i.;G L93 2.4R 13.10 3.36 410 4.86 5.63 6.4E [ 15 8.20 1- 1 I LTi 14.19 I17.55 20.93 10 i 0.75 i 20 1.52 2.21 ZS 0.85 1.35 1.?2 2.54 2.87!3.67 3.38 i4.46 4.OI 4.90 5.83 6]3 i.71 �d43J 10.45 13.45 4.92 6.03 7.23 8.39 F9 Tqj El o 36 F,.60 9E 15.90 I6:I I '19.84 23.44 18 Ei6 K3 5 2G.83 FJQg .47 .17 211 00 1.0 10 1.59 ^_.O i 11] 381 5.13 , 4.241E 53 704 8.49 9T3 1Ell 291394 S2SG3 29.49 -zoo-IF, -R1.71 2.15 3.35 4,70 6. , 66U 8.14 9.88 11.44 13.06 .(>5 Li.I 11G.12 20.03 7Sfi 9.3j 11.44 13.25 i5.12 .57 17.OS 78.17 22.27 23.OG j28.30 32.18 �259013i.Oj 34.SS 500 L 117 1.86 2.33 .72 5.33 7.72 8.97 J,1.16 13.7i 1QW 18.25 � J 19.94 20.99 25.44 28-.33 34.87 3b it 1R00 1.26 1.98 2A8 9,02 5.57 8.CS 10.23 I2.77 i5.S7 1839 20.96 21.13 22:32 233G 28.00 30:R0 27:84 4130 I exi version of table I "�Se pfe'p'�°?n m 7 "Tklkl are bases on a pania our m ser% ARI F 04 Average Ra ,,tse interval: Please:elerwtheoorunen%M fan ,;,Iu alen. NOTE:=ovwtiN 1-, a fima'm now zero to appex as rero. Upper hound of the 90% confidence interval Precipitation Frequency Estimates (inches) 10 IS 30 60 120 3 6 12 24 48 << 7 LO 20 30 (4� 60 Tin min n:in min min hr hr hr �I hr I��� I o 2 5 10 25 50 1 200 1 IOOD 1.36 I 2.70 9.37 6.38 9.46 11.18 t4.02 17.53 20 41 23 50 23 6j 24.78 25.90 30.76 33'.561� the upper bouts of mewn9oerae m,oval al9044cxdGence We, a the udueN„ of toe 54MIaled quarme valves far a given Gequerq are grearor awn. These pleciotation kequen,.y estMI, are based cn a partei 4arliio Selim. ARi is the Average Reamence IMcn'x. Please relw to the ooax ema5oo tormore!M ioVl1$ n: NOTE: Eoim m g WevrnK esU I, Ma (o appear a: Zero. ;1O)WIT' bound of the 900/0 confidence interval Precipitation Frequency Estimates (inches) (ceazs) min10 30 60 120 3r 6 2 4 48 4 20 e0 45 hhmin min hr mn � http:(','hdse.nws.noaa.goN,/cgi-bin/hdscibuildout. perl?type=pf&,units=us&series=pd&statena... 2;8/2008 _ 1 Ili_44 ,_.45 o.,U 'L4..+ ll4.ri Ih.h0 Ij'-t; 119 _U 1141.661111 2 1 50 1 200 0.97i 1.54 1.94 3.03 4.24 5.92 6.72 8.24 9.96 11.58 11.14 13.6.R li.l4 L 500 1.05 L6G 2,09 3.32 4.76 EKE 9.69 1LRO 13.71 15.54 1 G 03 17.40 1000 LI I IJS 2.20 3?G i,2017.63 S.RR 10.9G 73A1 ISSO 17.56 17.9R 19?+[ 'The bwer borne d the conh1ence irt=-Mat9 MOdmce let'elu the valuerMcA A of Onsmated Im,* values!a ai ' Ih A Praopamm5epue,,', ,bna;es se o2Kd on a partial duraton manna sane,. ARI is the Average ReeirtenIe luterrd, Phase rely to Ne doamarur-lam e'vdonson.NOTE: FsmzCise pretests e9una es sea zerc m:ppeaas Partial duration based Point Precipitation Frequer:cy Estimates - Version: 3 34.672 ti 77.456 W 9 ft 42 Ae 34 P = 30 _ e o 26 e4 r 22 20� ° 16 Fl 14 f' ....r10 _771-7- 0 l , 1 2 3 4 5 6 7.8 910 20 30 40 50 80100 140 200 300 500 700 Me Fri Feb 08 10:.22: Auera Be Recurrence Intervalfy.,ars) 45 2008 ' Dure. ion 5 min 3-n:�. .-r- -+- L0-d=u -•- ,Cj_y°y e da hitp: h1i dsc. nw•s, n0aa.90v/cgi-bi n/hdsc/bui ldout, Pert?type=pf&uni is =us&Seri es=pd&statcna... 2/812008 TerraServer Image Courtesy of the USGS Page I of I Send To Printer Back To TerraServer Change to 11x17 Print Size Show Grid Lines Change to Landscape 0' '.Wi Image courtesy of the U.S. Geological Survey © 2004 Microsoft Corporation. Terms of Use Privacy Statement http://terraserver-usa.com/Printlmage.aspx?T=2&S=13&Z=18&X=172&Y=2402& W= I &D... 5/6/2008 Channel Report Hydraflow Express Extension for AutoCAD® Civil 3D® 2008 by Aulodesk, Inc. Proposed Outfall for Sand Filters (Q10) Trapezoidal Bottom Width (ft) = 2.00 Side Slopes (z:1) = 15.00, 108.00 Total Depth (ft) = 0.82 Invert Elev (ft) = 17.42 Slope (%) , = 0.67 N-Value = 0.240 Calculations Compute by: Known Q Known Q (cfs) = 3.32 Elev (ft) Section 19.00 18.50 W-111111 17.50 17.00 16.50 Monday, May 12 2008 Highlighted Depth (ft) = 0.50 Q (cfs) = 3.320 Area (sgft) = 16.37 Velocity (fUs) = 0.20 Wetted Perim (ft) = 63.52 Crit Depth, Yc (ft) = 0.17 Top Width (ft) = 63.50 EGL (ft) = 0.50 Depth (ft) 1.58 1.08 M -0.42 -0.92 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Reach (ft) Table 8.05a Maximum Allowable Design Velocities' for Vegetated Channels Typical Soil Grass Lining Permissible Velocity' Channel Slope Characteristics' for Established Grass Application Lining (ftfsec) 0-5% Easily Erodible Bermudagrass 5.0 Non -plastic Tall fescue 4.5 (Sands & Silts) Bahiagrass 4.5 Kentucky bluegrass 4.5 Grass -legume mixture 3.5 p 01; Erasion Resistant Bermudagrass 6.0 Plastic Tall fescue 5.5 (Clay mixes) Bahiagrass 5.5 Kentucky bluegrass 5.5 Grass -legume mixture 4.5 5-10% Easily Erodible Bermudagrass 4.5 Non -plastic Tall fescue 4.0 (Sands & Silts) Bahiagrass 4.0 Kentucky bluegrass 4.0 Grass -legume mixture 3.0 Erosion Resistant Bermudagrass 5.5 Plastic Tall fescue 5.0 (Clay mixes) Bahiagrass 5.0 Kentucky bluegrass 5.0 Grass-leguma mixture 3.5 >10% Easily Erodible Bermudagrass 3.5 Non -plastic Tall fescue 2.5 (Sands& Silts) Bahiagrass 2.5 Kentucky bluegrass 2.5 Erosion Resistant Bermudagrass 4.5 Plastic Tall fescue 3.5 (Clay mixes) Bahiagrass 3.5 Kentucky bluegrass 3.5 Source: USDA-SCS Modified NOTE: 'Permissible Velocity based on 10-year storm peak runoff 'Soil erodibility based on resistance to soil movement from concentrated flowing water. 3Before grass is established, permissible velocity is determined by the type oftemporary liner used. rtM ECS CAROLINAS LLP ,CAROL'INAS Cywtechni6al'' Constiu&ion Materials • Environmental • FacilitiesM h 5, 2008 ' Mr. Jeff Bass. Clark Nexsen 6160 Kempayille Circie -Norfolk,• Virginia 23.502' Re: Infiltration Evaluation FRC Mamteuance Facility Jacksonvi,16,North Carolina ECS Project No. 22:-138511 Dear Mr. bass, ECS''Carolmas LLP (BCS)�r cently conducted an infiltration evaluation for .the .proposed mfiltiahon area at the srte 466ated at the end of Campbell Road m�the•New River Air Station:iri, ..:-K .. r .i ♦. ... i Jaolrsoriville, North Carolina This letter, witli:attachments is tfie report of our evaluations Field Test[ng On March 3, 2008 ECS met mth-Mr:-John Cotton with Bay'Elecinc on site m order to provide the,requesteditest locations ECS then conducted an exploration of -the subsurface soil 'and, kgroundrwater conditions at four requestedllocations shown°'on the attached Site,piagram - ,The purpose of thia exploration�was,to obtain subsurface irifoimahon�of the suitability of,tli"e' in; place,soils'for the proposed!mfilte- area We explored the subsurface soil and`gronod'water conditions by advancing one hand auger boring into the existin&ground surface at the four• requested, poring locations We visnallyl elasstf3ed.the subsurface sods ;arid obtaihed i u representative samples of each soil type encountered' We also recorded the ground water level observed at the_tune of eachhand' auger boring' The.atiached hifiltrationoEvaluation Form, f provides a summary of the subsurface condiiii' ncbuntered at each hand, auger boring location { s , ground water level and the seasonal high ground wateF level (SHWL) were estimated "at. s each' boriig location below'the existing grade elevation' Below rs a summary of each, be locatiom " I cation Water•Level S HWL 1, 55^inches 30-inches. SSinches s'r; 30,111c}es_.. ' 4 50 mclies y ` 30 inches t d l r 721 l Ogden Business Park Suite 201 Wilmington, NC 28411 • (910) 686-91�14 • Faxr(910) 686-9666 wMv ecslumted.com 'rAshevl'6 NC 6ad6iiL'NQ t7ceensboro,NG yGreenville;BC Raleigh,�NC Swaueboro NC• ,R'ilmmgtoa•NC- ' teshag 6mice6 only Infiltration Evaluation FRC Maintenance Facility Jacksonville, North Carolina ECS Project No. 22.13851 Utilizing a compact constant head permeameter, we have conducted four infiltration tests near hand auger borings to estimate the infiltration rate for the subsurface soils. The infiltration tests are typically conducted at two feet above the SHWL. Meld Test Results Below is a summary of the infiltration test results: Location Description Depth Inches/hour Inches/mmurte 1 Grey/tan fine 10 inches 0.0 0.0 SAND w/clay lenses 2 Black sandy 10 inches 0.0 0.0 SILT 3 Grey/black 10 inches 0.0 0.0 CLAY w/sand 4 Black silty 10 inches 0.0 0.0 SAND The test results indicated that there was no infiltration due to the clay, silt and moisture content in the soils. Infiltration rates and SHWL may vary within the proposed site due to changes in elevation and subsurface conditions. If you have any questions regarding this report, please contact us at (910) 686-9114. Respectfully, ECS CAROLINAS,,LLP K. Brooks Wall Staff Geologist Attachments: Site Diagram Infiltration Evaluation 04C%--_ Walid M. Sobh, P. E. Principal Engineer NC License No. 22983 i FRC Maintenance Facility New River Air Station 0 BORING LOCATIONS ECS Project No. 22-13851 March 3, 2008 1 BW Infiltration Evaluation FRC Maintenance Facility Jacksonville, North Carolina ECS Project No. 22.13851 March 3, 2008 Location Depth Soil Description 1 0-40" Grey fine SAND w/clay lenses (fill) 40"-60" Black sandy, clayey SILT Seasonal High Water Table was estimated to be at 30 inches below the existing grade elevation. Infiltration Rate: 0.0 inches per minute (0.0 inches per hour) Test was conducted at 10 inches below existing grade elevation Ground water was encountered at 55 inches below the existing grade elevation. Location Depth Soil Description 2 0-12" Black sandy SILT 12"-36" Orange/grey CLAY w/some sand 36"-60" Black CLAY w/ sand Seasonal High Water Table was estimated to be at 30 inches below the existing grade elevation. Infiltration Rate: 0.0 inches per minute (0.0 inches per hour) Test was conducted at 10 inches below existing grade elevation Ground water was encountered at 55 inches below the existing grade elevation. Location Depth Soil Description 3 0-6" ABC stone 6"-10" Grey fine SAND w/clay lenses (fill) 10"-36" Grey/black CLAY w/sand Seasonal High Water Table was estimated to be at 15 inches below the existing grade elevation. Infiltration Rate: 0.00 inches per minute (0.0 inches per hour) Test was conducted at 10 inches below existing grade elevation Ground water was encountered at 26 inches below the existing grade elevation Infiltration Evaluation FRC Maintenance Facility Jacksonville, North Carolina ECS Project No. 22.13851 March 3, 2008 Location Depth Soil Description 4 0-20" Black silty SAND 20"-60" Grey/black CLAY w/sand Seasonal High Water Table was estimated to be at 30 inches below the existing grade elevation. Infiltration Rate: 0.0 inches per minute (0.0 inches per hour) Test was conducted at 10 inches below existing grade elevation Ground water was encountered at 50 inches below the existing grade elevation C Michael F. Easley, Governor William G. Ross Jr., Secretary rNorth Carolina Department of Environment and Natural Resources 1 .� Coleen H. Sullins Director Division of Water Quality May 19, 2008 Carl Baker, Deputy Public Works Officer United States Marine Corps, Camp Lejeune, North Carolina 1005 Michael Rd Camp Lejeune, NC 28574 Subject: Request for Additional Information Stormwater Project No. SW8 080510 FRC Maintenance Facility at MCAS New River, Onslow County Dear Mr. Baker: The Wilmington Regional Office received a State Stormwater Management Permit Application for FRC Maintenance Facility at MCAS New River on May 14, 2008. A preliminary review of that information has determined that the following information is needed to continue the stormwater review: 1. Please report consistent values for built -upon area on the application and plans. The BUA reported on plan #C-104 differs from the values included on the application table. C-104 reports total proposed BUA of 25,605.17 square feet and the application table reports proposed total of 17,631 sf. Report all BUA within the drainage areas delineated on plans C-104 and DA-2 on both tables in the application and the plans. The application table reports greater bua proposed than existing, yet in the meetings on April 23 and May 7, the project was stated as proposing less BUA. 2. Verify the treatment volume on the sand filters. The volume to treat is reported as 899 cubic feet, whereas the calculated volume in accordance with the bmp should be closer to 950 cu ft. [WQV sch = 3630 RdRvAtotal] 3. Verify the surface area provided of each sand filter chamber. The supplement and calculations report 100 sf, yet the plans delineate an area 18 x 5 = 90 sf due to the bypass weir/outlet. Provide an off-line bypass, prior to the sediment chamber as required in the bmp with a flow splitter, thus increasing the treatment area/volume in the media chamber. 4. Label the plans with the engineer name, firm, and address. Although a PE stamped the plans, no firm name or address were included. 5. Please verify the bypass is provided for the volume in excess of the design storm. The supplement states no, yet a weir is detailed on plan C107. 6. Correct the level spreader detail on C106 for the outlet from a swale. The section detail and notes currently report information to collect runoff from a basin. 7. Submit $500 fee for additional information required in the express program. 8. Please note that a revision to one number may have a domino effect on other numbers, which may require revision of the applications, calculations, supplements, plans, details, and associated documentation. Please verify all numbers are correct to ensure consistency in the application documents. Please note that this request for additional information is in response to a preliminary review. The requested information should be received in this Office prior to May 27, 2008, 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, email 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. N hCarolina Jl Wura//y North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone (910) 796-7215 Customer Servicc Wilmington Regional Office Internet: tvww ncwaterauality ore Fax (910) 350-2004 1-877-623-6748 An Equal Opportunity/Affirmative Action Employer — 50% Recycled110% Post Consumer Paper The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. If you have any questions, please call me at (910) 796-7303 or email me at mary.Naugle@ncmail.net. Sincerely, ` Mary Jean Naugle ENB/mjn: S:\WQS\STORMWATERWDDINFO\2008\080510 may08 CC: Joshua Hurst, PE, Clark Nexsen Wilmington Regional Office M. J. N. Basin Information DA-1 DA-2 DA-23 Receiving Stream Name Stick Creek Stream Class & Index No. Class: SC,HQW,NSW Index No: 19-15 Drainage Areas 7989 7989 22651 Existing Impervious Area (so 3154 7849 5776 Proposed Impervious Area (so 7989 7989 1653 % Impervious Area (total) 100% 100% 7% Impervious Surface Area On -site Building s 7989 7989 0 On -site Streets (so 01 0 0 On -site Parking (sD 01 0 0 On -site Sidewalks sf 01 0 1089 On -site ads/sandfilters 0 0 564 Off -site s 01 0 0 Total (sfj)j 79891 79891 1653 Ambitecture & Engineering 4000 I f/ertGmre Blvd, Suite 280 Raleigh, North Carolina 27607 9191828-1876 Fax 9191828-1877 http: / / www. clarknesren. com We transmit For Your The Following To: NCDENR 127 Cardinal Drive Ext. Wilmington, NC 28405 Attn: MaryJean Naugle (gta5-7q 6-7303 ® herewith ❑ in accordance with your request ❑ under separate cover Z approval ❑ review and comment ❑ use Date: May 14, 2008 Project No: 2496 Reference: FRC Maintenance Facility at MCAS New River MAY 14)2008 distribution to parties ❑ record ❑ information ® drawings ❑ computer file(s) ® calculations ❑ samples ❑ change order ❑ product literature n shop drawings � other Copies Date Description 1 $4,000 Check to NCDENR for Express Stormwater Review `f$Z�q 1 May 2008 Comments Response Letter 1 May 2008 Rendering of FRC Maintenance Facility Building 2 May 2008 1 Original and 1 Copy of Stormwater Management Permit Application Form 1 May 2008 Sand Filter Supplement for Drainage Areas (DA) 1 and 2 (2 total) 1 May 2008 Grassed Swale Supplement for Drainage Areas (DA) 1, 2, and 23 (1 total) 1 May 2008 Level Spreader, Filter Strip and Restored Riparian Buffer Supplement for Drainage Areas (DA) 1, 2, and 23 (1 total) 1 May 2008 Sand Filter Operation and Maintenance Agreements for DA 1 and 2 (2 total) 1 May 2008 Grassed Swale Operation and Maintenance Agreement 1 May 2008 Filter Strip, Restored Riparian Buffer and Level Spreader Operation and Maintenance Agreement for DA 1, 2, and 23 (1 total) 2 May 2008 Stormwater Calculations (including soils report) 2 May 2008 Site Plans (full size) Please contact me via email (jhurst clarknexsen.com) or at (919) 828-1876 if you have any questions or need anything else from us for the express stormwater review of this project. Thank you. By: K. Joshua Hurst, P.E., PTOE Copies to: \\cn_admin\data\jobs\2496-FRC Maint Fac-DEW\4 Correspondence\transmittals\080514 Mary Jean Naugle - NCD6:NR.doc W &REsPoNSFS Architecture 6— Engineering Project: FRC Maintenance Faality at New RiverAir Station \CCDENR Stormwater Submittal: Stormwater Express Review Date of Submittal: May 13, 2008 4000 I17esichase Blvd, Suite 280 Location: New River Air Station, NC { Raleigh, NC27607 CN Ref. No.: 1\i2496.2 9191828-1876 �` T Fax 9191828-2877 blip://www.clarkne.vsen.com MP`( Below are NCDENR's comments and Clark Nexsen's responses to the stormwater review of FRC I6lainteno Facility at New River Air Station. NCDENR's comments are listed first, followed by our response in italics. 1. Demonstrate that all roof drainage is directed into the bmp. Show the roof drain collection piping on the plans. [re: checklist item V.C.261. Response: The roof drain collection piping has been added to sheet C104, and an architectural rendering has been provided with this submission to illustrate the roof drain connection to the sand filler. 2. Provide details of roof drain outlet into the sand filters. Consider flow sputter devices to minimize erosive velocity into the sand filters. Erosive velocities and high sediment loads are a concern with sand filters. Jbmp 11.3.A] Response: See sand filter structure detail on sheet C107 for bypass around the sand filter chamber for large storms. The overflow weir has been sized to accommodate a 100year storm, see calculations. 3. Provide a wide bottom trapezoidal swale and maximize the level spreader in accordance with the bmp to the maximum extent practical within site limitations. There appears to be space on the north side of the level spreader to meet the sizing requirement of the BMP table 8-1 which requires 13 feet of level spreader lip per 1 cfs. lie: BMP section 8 and 13]. Although this site has limitations due to development around existing built -upon area, provide the level spreader length where there is green space. Response: The Swale has been reconfigured to provide a 2' wide bottom, see sheet C107 dam' C104. The level spreader has been increased in length to accommodate 13 feet per 1 cfs, which is equivalent to 43.16 fi, see sheet C104. 4. Label the bottom elevation of the sand filters on the plans [re: checklist item V.C.18]. Response: The bottom elevation has been added to sheet C104, labels 8 and 9. In addition the elevation is shown on the sand filler detail on sheet Cl07. 5. Label plans with a note that the east pad is to be treated with future builtuponarea on adjacent property-i.e. hangar. This bua is not treated at this time due to site limitations of existing contours. Response: Note 2 under General Notes has been added to address ibis comment, and in addition an approximate limits have been drawn in on sheet C104, see labe113. 6. Provide submittal check for the application. Response: A check has been provided with this submission. 7. Provide a site location map on the plans [re: checklist item V.C. 5 and application section VI (1)]. Response: A site location map has been provided on sheet C102. \\cn_admin\data\jobs\2496-FRC Maint Fac-DE W\4 Corcespondeace\transmittals\2008-05-13 NCDENR Stomiwater Comments Response \lemo.doc Page I of 2 Page I COMMFNIS&RFSPONSES Architecture & Engineering Project: FRC Maintenance FaciW y at New River Air Station ATCDEATR Stormwater Submittal: StormwaterE%precr Review Date of Submittal: May 13, 2008 8. Provide bypass of runoff in excess of the design storm to a vegetated filter prior to entering the bmp [15A NCAC 2H.1008(d)(4), BMP section 11.3.A. Response: See sbeet C107 .rand filter detail for the bmp bypass, wbicb outfalls to the grass swale and to the vegetated filter strip. The bypass weir in the structure avoids the sand filter ebamber, but does enter the sediment chamber of the structure. Since 9. Provide calculations to demonstrate non -erosive velocities in vegetated swales and filter strips. Response: See swale calculations provided with this submission, and the weir calculations for the level spread that demonstrate the velocities the will be received by the filter strip. 10. Provide swale supplement and O&M. Re pone: A copy of the Swale supplement has been provided with this submission, see attached. A swale supplement bas been provided with this submission, but it is only a copy of the onginal. David Towler with Camp Lejeune is mailing the original and has addressed it toyou. Please contact Josh Hurst (919)828-1876 orJeBass (757)455-3800 immediately ifyou do not receive the original. 11. Provide dissipater on outlets, preferably level spreader. Include on both the bypass to the sand filters and the outlet of the sand filters to ensure diffuse flow of stormwater. Response: Agravel outlet bar been added to the outfall for the sand filter chamber and bypass to dissipate the energy flowing from the sand filter structure. 12. Provide observation wells and/or clean -out pipe on the end of each sand filter. [bmp 11]. Response: Clean outs have been added to the Sand Fiberperforated pipe, see sheet C107. \\cn_admm\data\jobs\2496-FRC Maint Fac-DEW\4 Correspondence\transtnittals\2008-05-13 NCDENR Stormwater Comments Response Afemo.doc Page 2 of 2 Page 2 FRC Maintenance Facility at New River Air Sta.- Stormwater applic... h 2tsop.<Y12 Subject: FRC Maintenance Facility at New River Air Sta.- Stormwater application Bi (Y\&1L From: Mary Jean Naugle <Mary.Naugle@ncmail.net> Date: Wed, 07 May 2008 15:04:12 -0400 To: "Jeff J. Bass" <jbass@ClarkNexsen.com>, jhurst@clarknexsen.com, rcummings@clarknexsen.com, Mary Naugle <Mary.Naugle@ncmail.net> Bobby and Josh; Below are items we discussed this morning to complete the application for stormwater : 1. Demonstrate that all roof drainage is directed into the bmp. Show the roof drain collection piping on the plans. [re: checklist item V.C.26]. 2. Provide details of roof drain outlet into the sand filters. Consider flow splitter devices to minimize erosive velocity into the sand filters. Erosive velocities and high sediment loads are a concern with sand filters. [bmp 11.3.A] 3. Provide a wide bottom trapezoidal swale and maximize the level spreader in accordance with the bmp to the maximum extent practical within site limitations. There appears to be space on the north side of the level spreader to meet the sizing requirement of the BMP table 8-1 which requires 13 feet of level spreader lip per 1 cfs. [re: BMP section 8 and 13]. Although this site has limitations due to development around existing built -upon area, provide the level spreader length where there is green space. 4. Label the bottom elevation of the sand filters on the plans [re: checklist item V.C.181. 5. Label plans with a note that the east pad is to be treated with future built -upon area on adjacent property-i.e. hangar. This bua is not treated at this time due to site limitations of existing contours. 6. Provide submittal check for the application. 7. Provide a site location map on the plans [re: checklist item V.C. 5 and application section VI (1)]. 8. Provide bypass of runoff in excess of the design storm to a vegetated filter prior to entering the bmp [15A NCAC 2H.1008(d)(4), BMP section 11.3.A. 9. Provide calculations to demonstrate non -erosive velocities in vegetated swales and filter strips. 10. Provide swale supplement and O&M. 11. Provide dissipater on outlets, preferably level spreader. Include on both the bypass to the sand filters and the outlet of the sand filters to ensure diffuse flow of stormwater. 12. Provide observation wells and/or clean -out pipe on the end of each sand filter. [bmp 11]. I attached the checklists to help with documentation for the submittal. Please let me know if you need other information to complete the application. Mary Jean Naugle NC DENR- WiRO 910-796-7303 Checklist for Express Permitting.doc Content -Type: application/msword Content -Encoding: base64 I of 2 5/7/2008 3:04 PM Re: FRC MAINTENANCE FACILITY - QUESTION Subject: Re: FRC MAINTENANCE FACILITY - QUESTION From: Mary Jean Naugle <Mary.Naugle@ncmail.net> Date: Mon, 05 May 2008 10:28:46 -0400 To: "Jeff J. Bass" <jbass@ClarkNexsen.com>, Mary Naugle <Mary.Naugle@ncmail.net> Jeff; for this project ... The conditions of redevelopment require that the new built -upon area be less than the prior built -upon area and that stormwater treatment is to the maximum extent practical. NPDES ph 2 does not apply to redevelopment for pre/post requirements. The rule states that redevelopment means any rebuilding activity which has no net increase in built -upon area. 15A NCAC 02H. 1002 (14). Redevelopment provides stormwater control which meets the requirement of the rule to the maximum extent practicable. [.1003(3)(B).l Post construction practices required by section 9 of the session law 2006-246 shall not apply to redevelopment. [section 8 (2)]. Treat for 1 1/2 inch. Future modifications may have different conditions depending on the built -upon area and the rules at the time of permit modification. Include documentation to demonstrate the prior and the current built -upon area within the project limits. Report elevations and contours on plans to demonstrate that the runoff is collected and treated to the maximum extent practical. Demonstrate sheet flow of the rebuilt paved area to the west vegetated areas as much as possible [label future hangar expansion]. Please let me know if you need more information. Mary Jean Naugle 910-796-7303 Jeff J. Bass wrote: Mary Jean, I wanted to touch base with you to make sure we are on the same page, and that my submittal on Wednesday will be acceptable to you. The FRC Maintenance Facility project is a redevelopment project and I've sized my sand filter systems for the building based on the WQV that is based on post development volumes minus pre development volumes, as specified in Chapter 3. The only thing that is questionable is whether predevelopment conditions for redevelopment can be based on the current surveyed conditions, or do we need to consider predevelopment to be a cleared field (as usually used with new construction sites). Can you please clarify the definition of predevelopment when working with a redevelopment project and trying to calculated WQV? Thanks! Jeffrey J. Bass P.E. Associate, Civil Engineer CLARK�NEXSEN Architecture & Engineering 6160 Kempsville Circle Suite 200A Norfolk, VA 23502 757.961.7805 Tel. 757.455.5638 Fax jbass@clarknexsen.com www.clarknexsen.com CONFIDENTIALITY NOTE: This e-mail and any files transmitted with it contain privileged and confidential information and are intended solely for the use of the individual or entity to which they are addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, you are hereby notified I of 2 5/5/2008 10:38 AM P t-T�41 Lr. 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Cummings II, BE.ture &Engineering[/ice 1'resrdentCO bempruille Circle -- Suite 200Aolk, Virginia 23502757 455-5800EQa 757 455-5C38gs@clarknmuen. ramww rlarkrrersen."m CLACLAI• E[:C3 :. �� t .]1 ♦ .1 `' i �. i i, iti 1 9'LL1 ,f',1 ..,t �1" ,l.J ': . 1 �' :Y`•/ s(^�1;_�:i I;J (,. GI)'..,,ir - :.I, C •�l(,'�•���", Vi 1'�'lTl.:' },'i•�/i.\ 1 ,r y 4