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HomeMy WebLinkAboutSW6110903_CURRENT PERMIT_20110921STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE CURRENT PERMIT APPROVED PLANS ❑ HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE Al1, Z YYYYMMDD MDE R North Carolina Department of Environment and Natural Resources Beverly Eaves Perdue Governor Division of Water Quality Coleen H. Sullins Director September 21, 2011 Mr. David Heins, DPW/Environmental Division Chief Fort Bragg 2175 Reilly Road Stop A Fort Bragg, North Carolina 28310 Subject: Stormwater Permit No. SW6110903 JSOC, SOF Squadron HQ Addition Cumberland County Dear Mr. Heins: ®ENR—FRO SEP 2 6 2011 ®WQ Dee Freeman Secretary The Stormwater Permitting Unit received a complete Stormwater Management Permit Application for the JSOC, SOF Squadron HQ Addition on September 19, 2011. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000 and Session Law 2006-246. We are forwarding Permit No. SW6110903, dated September 21, 2011, for the construction, operation and maintenance of the subject project and the stormwater BMPs. This permit shall be effective from the date of issuance until September 20, 2021, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for inspection and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 2761 1-7447. Unless such demands are made this permit shall be final and binding. This project will be kept on file at the Fayetteville Regional Office. If you have any questions, or need additional information concerning this matter, please contact Mike Randall at (919) 807-6374; or mike.randall@ncdenr.gov. Sincerely, for Coleen H. Sullins cc: (Faytteville Regional Office SPU Files Wetlands and Stormwater Branch t.TOne !� 1617 Mail Service Center, Raleigh, North Carolina 27699-1617 iv OrffiCarci Phone:: 612 N. Salisbury St. 19-807- North Carolina 47604 a attune //y Phone: 919A07-6300\FAX: 919b07-64941 Customer Service:l-877-623-6748 ��/K ` " Internet: www.ncwaterquality.org An Equal Oppodunily 1 Aarmabve Action Employer State Stormwater Permit Permit No. SWE.110903 STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Fort Bragg JSOC, SOF Squadron HQ Addition Cumberland County FOR THE construction, operation and maintenance of four bioretention cell(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 September 20, 2021, 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. This stormwater system has been approved for the management of stormwater runoff as described in this permit. The stormwater control has been designed to handle the runoff from the impervious area. The tract will be limited to the amount of built -upon area as indicated in this permit, and per the application documents and as shown on the approved plans. 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. 5. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. 6. The built -upon areas associated with this project shall be located at least 30 feet landward of all perennial and intermittent surface waters. 7. The design criteria as provided in the per the application documents, bioretention cell supplements and as shown on the approved plans must be maintained: Page 1 of 4 State Stormv.ater Permit Permit No. OW61 10903 II. SCHEDULE OF COMPLIANCE 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 time 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 re -vegetation of slopes and the filter strip. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans. f. Debris removal and unclogging of all drainage structures, level spreader, filter media, planting media, underdrains, catch basins and piping. g. Access to the cell and outlet 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. 5. The permittee shall prepare 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 void unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been installed in accordance with this permit, the approved plans and specifications, and other supporting documentation. Any deviations from the approved plans and specifications must be noted on the Certification. A modification may be required for those deviations. 8. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 9. 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, Page 2 of 4 State Stormwater Permit Permit No. SW6110903 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. III. GENERAL CONDITIONS This permit is not transferable 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 signed by both parties, to the Division of Water Quality, accompanied by the supporting documentation as listed on page 2 of the form. The approval of this request will be considered on its merits and may or may not be approved. 2. The permittee is responsible for compliance with all permit conditions until such time as the Division approves a request to transfer the permit. 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 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. Page 3 of 4 State Stormwater Permit Permit No. SW6110903 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 renewal request with all required forms and documentation at least 180 days prior to the expiration date of this permit. Permit issued this the 21st day of September, 2011. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION Division of Water Quality By Authority of the Environmental Management Commission Page 4 of 4 State Stormwater Permit Pr,rmit No. SW6110903 JSOC, SOF Squadron HQ Addition Stormwater Permit No. SW6110903 Cumberland County Designer's Certification 1, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, JSOC, SOF Squadron HQ Addition (Project Name) 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 1 of 2 State Stormwater Permit Permit No. SW,3110903 ' 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 outlet/bypass structure elevations are per the approved plan. 6. The outlet structure is located per the approved plans. 7. Trash rack is provided on the outlet/bypass structure. 8. All slopes are grassed with permanent vegetation, per the vegetation plan. 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. Required drawdown devices are correctly sized per the approved plans. 13. All required design depths are provided. 14. All required parts of the system are provided, such as a vegetated shelf, and a forebay. 15. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ Regional Office Page 2 of 2 DWQUSEONLY Date Received Fee Paid Permit Number 450 4 S 53o I 6w to I t o q 0 3 Applicable Rules: ❑ Coastal SW -1995 ❑ Coastal SW - 2008 ❑ Ph II - Post Construction (select all that apply) ❑ Non -Coastal SW- HQW/ORW Waters ❑ Universal Stormwater Management Plan ❑ Other WQ Mgmt Plan: State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I *YZ.MW.WrOMO t r] i51:1tIILivi 1. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): ISOC, SOF Squadron HQ Addition (LI 60821) 2. Location of Project (street address): To the west of Malvesti Road approximately 450 feet after passingthrough hrough the main ISOC compound security access gate off of Butner Road. City:Fort Bragg County:Cuntberland Zip:28310 3. Directions to project (from nearest major intersection): Proceed north on Malvesti Road. The developed site is situated at existing building number 3-3242. The existing overflow parking is located to the south of the project site. 4. Latitude:35° 09' 39.30" N Longitude:79° 00' 33.00" W of the main entrance to the project. It. PERMITINFORMATION: 1. a. Specify whether project is (check one): ®New ❑Modification b.If this application is being submitted as the result of a modification to an existing permit, list the existing permit number , its issue date (if known) , and the status of construction: ❑Not Started ❑Partially Completed* ❑ Completed* *provide a designer's certification 2. Specify the type of project (check one): ❑Low Density ®High Density ❑Drains to an Offsite Stormwater System ❑Other 3. If this application is being submitted as the result of a previously returned application or a letter from DWQ requesting a state stormwater management permit application, list the stormwater project number, if assigned, N/A and the previous name of the project, if different than currently proposed, N/A 4. a. 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 ❑NPDES Industrial Stormwater ®Sedimentation/Erosion Control: 4.02 ac of Disturbed Area ❑404/401 Permit: Proposed Impacts b.If any of these permits have already been acquired please provide the Project Name, Project/Permit Number, issue date and the type of each permit: FormSWU-101 Version07Jun2010 Page I of Ill. CONTACT INFORMATION 1. a. Print Applicant / Signing Official's name and title (specifically the developer, property owner, lessee, designated government official, individual, etc. who owns the project): Applicant/Organization: Directorate of Public Works (DPW) Signing Official & Title:Mr. David Heins, DPW/Environmental Division Chief b.Contact information for person listed in item la above: Street Address:2175 Reilly Road Stop A City:Fort Bragg State:NC Zip:28310 Mailing Address (if opplicable):2175 Reilly Road Stop A City:Fort Bragg State:NC Zip:28310 Phone: (910 ) 396-8207 Email:david.a.heins@us.army.mil Fax: (910 ) 907-2420 c. Please check the appropriate box. The applicant listed above is: ® The property owner (Skip to Contact Information, item 3a) ❑ Lessee* (Attach a copy of the lease agreement and complete Contact Information, item 2a and 2b below) ❑ Purchaser* (Attach a copy of the pending sales agreement and complete Contact Information, item 2a and 2b below) ❑ Developer* (Complete Contact Information, item 2a and 2b below.) 2. a. Print Property Owner's name and title below, if you are the lessee, purchaser or developer. (This is the person who owns the property that the project is located on): Property Owner/I Signing Official & b. Contact information for person listed in item 2a above: Street Address: Mailing Address (if Phone: Fax: Zip: 3. a. (Optional) Print the name and title of another contact such as the project's construction supervisor or other person who can answer questions about the project: Other Contact Person/Organization: Mr. Lee Ward Signing Official & Title:DPW / Water Management Branch (WMB) b. Contact information for person listed in item 3a above: Mailing Address:Bldg. 0-9125, McKellars Road City:Fort Bragg State:NC Zip:28310 Phone: (910 ) 396-2301 x218 Email:lee.p.ward@us.army.mil 4. Local jurisdiction for building permits: Fax: (910 ) 907-2420 Point of Contact: Phone #: FormSWU-101 Vcrsion07Jun2010 Page2of6 IV. PROJECT INFORMATION 1. In the space provided below, briefly summarize how the stormwater runoff will be treated. Water quality and quantity will be provided by 4 proposed bioretention devices. Pretreatment will be provided by gravel and grass filter strips for bioretention area #1 and riprap lined entrances for bioretention areas #2, #3, and #4. 2. a. If claiming vested rights, identify the supporting documents provided and the date they were approved: ❑ Approval of a Site Specific Development Plan or PUD Approval Date: ❑ Valid Building Permit Issued Date: ❑ Other: Date: It. If claiming vested rights, identify the regulation(s) the project has been designed in accordance with: ❑ Coastal SW -1995 ® Ph II - Post Construction 3. Stormwater runoff from this project drains to the 4. Total Property Area: 4.02 acres River basin. 5. Total Coastal Wetlands Area: 0.00 acres 6. Total Surface Water Area: 0.00 acres 7. Total Property Area (4) -Total Coastal Wetlands Area (5) -Total Surface Water Area (6) = Total Project Area':4.02 acres Total project area slall be calculated to exclude thefollotoing. the normal pool of impounded structures, the area between the banks of streams and rivers, the area below the Normal High Water (NHW) line or Mean High Water (MHW)line, and coastal wetlands landward from the NHW (or MHW) line. Tire resultant / ro' ct area is used to calculate overall percent built upon area (BUA). Non -coastal wetlands landward of the NHW (or MHW) line may be included in the total project area. 8. Project percent of impervious area: (Total Impervious Area / Total Project Area) X 100 = 55 % 9. How many drainage areas does the project have?4 (For high density, count 1 for each proposed engineered storrwater BMP. For low density and other projects, use 1 for the whole property area) 10. Complete the following information for each drainage area identified in Project Information item 9. If there are more than four 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 Drainage Area 3 Drainage Area 4 Receiving Stream Name Tank Creek Tank Creek Tank Creek Tank Creek Stream Class * C C C C Stream Index Number * 18-23-27 18-23-27 18-23-27 18-23-27 Total Drainage Area (sf) 13986 9131 12867 4208 On -site Drainage Area (so 7936 9131 9580 4208 Off -site Drainage Area (st) 6050 0 3287 0 Pro osed Impervious Area** (so 7005 7260 8460 2001 Impervious Area** total 50 80 66 48 Impervious— Surface Area Drainage Area 1 Draina e'Area 2 Drainage Area 3 Drainage Area 4 On -site Buildings/Lots (sf) 0 6860 0 0 On -site Streets (so 0 0 0 0 On -site Parking (so 3971 0 '4358 1645 On -site Sidewalks (sf) 238 400 150 356 Other on -site (so 0 0 0 0 Future (so 0 0 0 0 Off -site (so 2796 1 0 3287 1 0 Existing BUA*** (so 0 1 0 665 0 Total (so: 7005 1 7260 8460 2001 Stream Class and Index Number can be determined at: Irttp://portal.rrcdenr.org,web/wq/ps/csu/classi cations Form SWU-101 Version 07Iun2010 Pace 3 of Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Report only that amount of existing BUA that will rentain after development. Do not report any existing BUA that is to be removed and which will be replaced by new BUA. 11. How was the off -site impervious area listed above determined? Provide documentation. Field survey and Projects in Union County: Contact DWQ Central Office staffto check ifthe project is located within a Threatened & Endangered Species watershed that may be subject to more stringent stormwater requirements as per NCAC 02B .0600. V. SUPPLEMENT AND O&M FORMS The applicable state stormwater management permit supplement and operation and maintenance (O&M) foam must be submitted for each BMP specified for this project. The latest versions of the forms can be downloaded from http://portal.ncdenr.org/web/wq/ws/su/ban-manual. 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. A detailed application instruction sheet and BMP checklists are available from http//portal.ncdenr.org/web/wq/ws/su/statesw/forms does. The complete application package should be submitted to the appropriate DWQ Office. (The appropriate office may be found by locating project on the interactive online map at http://portal.ncdenr.org/web/wq/ws/su/maps.) Please indicate that the following required information have been provided by initialing in the space provided for each item. All original documents MUST be signed and initialed in blue ink. Download the latest versions for each submitted application package from http://portal.ncdenr.org/web/wq/ws/su/statesw/forms does. nitials 1. Original and one copy of the Stormwater Management Permit Application Form. -3�S •S• 2. Original and one copy of the signed and notarized Deed Restrictions & Protective Covenants Form. (if required as per Part VII below) 3. Original of the applicable Supplement Form(s) (sealed, signed and dated) and O&M agreement(s) for each BMP. 4. Permit application processing fee of $505 payable to NCDENR. (For an Express review, refer to http://www.envlielp.org/12ages/`onestopexi2ress.html for information on the Express program and the associated fees. Contact the appropriate regional office Express Permit Coordinator for additional information and to schedule the required application meeting.) 5. A detailed narrative (one to two pages) describing the stormwater treatment/management 6. A USGS map identifying the site location. If the receiving stream is reported as class SA or the receiving stream drains to class SA waters within 1/2 mile of the site boundary, include the 1/2 mile radius on the map. 7. Sealed, signed and dated calculations. 8. Two sets of plans folded to 8.5" x 14" (sealed, signed, & dated), including: a. Development/Project name. b. Engineer and firm. c. Location map with named streets and NCSR numbers. d. Legend. e. North arrow. I. Scale. g. Revision number and dates. h. Identify all surface waters on the plans by delineating the normal pool elevation of impounded structures, the banks of streams and rivers, the MHW or NHW line of tidal waters, and any coastal wetlands landward of the MHW or NHW lines. • Delineate the vegetated buffer landward from the normal pool elevation of impounded structures, the banks of streams or rivers, and the MHW (or NHW) of tidal waters. i. Dimensioned property/project boundary with bearings & distances. j. Site Layout with all BUA identified and dimensioned. k. Existing contours, proposed contours, spot elevations, finished floor elevations. 1. Details of roads, drainage features, collection systems, and stormwater control measures. m. Wetlands delineated, or a note on the plans that none exist. (Must be delineated by a qualified person. Provide documentation of qualifications and identify the person who made the determination on the plans. N /A 7-S.S. 7.J.S, for 3S.J, Form S WU-101 Version 07Jun2010 Page 4 of 6 n. Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations. o. Drainage areas delineated (included in the main set of plans, not as a separate document). p. Vegetated buffers (where required). 9. Copy of any applicable soils report with the associated SHWT elevations (Please identify $, $• elevations in addition to depths) as well as a map of the boring locations with the existing elevations and boring logs. Include an 8.5"xll" copy of the NRCS County Soils map with the project area clearly delineated. For projects with infiltration BMPs, the report should also include the soil type, expected infiltration rate, and the method of determining the infiltration rate. (Infiltration Devices submitted to WiRO: Schedule a site visit for DWQ to verifij the SHWT prior to submittal, (910) 796-7378.) 10. A copy of the most current property deed. Deed book: Page No: 11. For corporations and limited liability corporations (LLC): Provide documentation from the NC /d��} Secretary of State or other official documentation, which supports the titles and positions held by the persons listed in Contact Information, item la, 2a, and/or 3a per NCAC 21-1.1003(e). The corporation or LLC must be listed as an active corporation in good standing with the NC Secretary of State, otherwise the application will be returned. http://www.secretary.state.nc.us/Corporations/CSearch.aspx VII. DEED RESTRICTIONS AND PROTECTIVE COVENANTS For all subdivisions, outparcels, and future development, the appropriate property restrictions and protective covenants are required to be recorded prior to the sale of any lot. If lot sizes vary significantly or the proposed BUA allocations vary, a table listing each lot number, lot size, and the allowable built -upon area must be provided as an attachment to the completed and notarized deed restriction form. The appropriate deed restrictions and protective covenants forms can be downloaded from http://portal.ncdenr.org/web/wq/ws/su/statesw/forms does. Download the latest versions for each submittal. In the instances where the applicant is different than the property owner, it is the responsibility of the property owner to sign the deed restrictions and protective covenants form while the applicant is responsible for ensuring that the deed restrictions are recorded. By the notarized signature(s) below, the permit holder(s) certify that the recorded property restrictions and protective covenants for this project, if required, shall include all the items required in the permit and listed on the forms available on the website, 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 NC DWQ and that they will be recorded prior to the sale of any lot. V III. CONSULTANT INFORMATION AND AUTHORIZATION Applicant: Complete this section if you wish to designate authority to another individual and/or firm (such as a consulting engineer and/or firm) so that they may provide information on your behalf for this project (such as addressing requests for additional information). Consulting Engineer.Mr. Jason Sesler, P.E. Consulting Firm: Greenhorne & O'Mara inc Mailing Address:5565 Centerview Drive, Ste. 107 City:Raleigh State:NC Zip:27606 Phone: (919 ) 325-4777 E mai I: isesle r@g-and-o. c om Fax: (919 ) 851-8393 IX. PROPERTY OWNER AUTHORIZATION (if Contact Information, item 2 has been filled out, complete this section) I, (print or hjpe name of person listed in Contact Information, item 2a) I certify that I own the property identified in this permit application, and thus give permission to (print or hjpe name of person listed in Contact Information, item la) with (print or hjpe name of organization listed in Contact Information, item la) to develop the project as currently proposed. A copy of the lease agreement or pending property sales contract has been provided with the submittal, which indicates the party responsible for the operation and maintenance of the stormwater system. Form SWU-101 Version 07Jun2010 Page 5 of As the legal property owner I acknowledge, understand, and agree by my signature below, that if my designated agent (entity listed in Contact Information, item 1) dissolves their company and/or cancels or defaults on their lease agreement, or pending sale, responsibility for compliance with the DWQ Stormwater permit reverts back to me, the property owner. As the property owner, it is my responsibility to notify DWQ immediately and submit a completed Name/Ownership Change Form within 30 days; otherwise I will be operating a stormwater treatment facility without a valid permit. I understand that the operation of a stormwater treatment facility without a valid permit is a violation of NC General Statue 143-215.1 and may result in appropriate enforcement action including the assessment of civil p alf s/o up to $25,000 per day, pursuant to NCGS 143-215.6. �7 / Signature :Gini Date: 1 °� a Notary Public for the State of . County of do hereby certify that personally appeared before me this _ day of . and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission X. APPLICANT'S CERTIFICATION I, (print or type name of person listed in Contact Information, item la) Mr. David Heins 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 covenants will be recorded, and that the proposed project complies with the requirements of the applicable stormwater rules under 15A NCAC 2I-1 .1000, SL 2006-246 (Ph. II - Post Construction) or SL 2008-211. Signature: I, a Notary Public for the State of , County of do hereby certify that personally appeared before me this _ day of and acknowledge the due execution of the application for a stormwater permit. Witness my hand and official seal, SEAL My commission Form SWU-101 Version 07Jun2010 Page 6 of 6 GREENHORNE & O'MARA, INC. &-0 Lo 1 k 0 103 5530 Phone:919-851-1919 5565 Centerview Drive Suite 107 66-0521531 Raleigh, NC 27606 Q BRANCH Irma Date Slit) I'I to the—N C D III WACHOVIA WacMNa Bank. a dWISIOn al MCA Farpa Bank. N.A. FOR_C(tr M % Pro���� CAL449Q 11'00553011' i:0531016261: 2000000 3 2 5 2u' Ft. Bragg, SOF Squadron HQ Addition Project Stormwater Management Narrative The proposed project known as Fort Bragg JSOC Squadron HQ Building Addition consists of a new 2-story building addition to the existing 2-story building (Building 3- 3242), associated parking and utilities, and bioretention stormwater management devices. This report presents the stormwater management calculations for the project The property is located on Fort Bragg in Cumberland County, North Carolina with access to the site off of Malvesti Street. The SOF Squadron HQ Addition is located in the Southwest section of the Joint Special Operations Command (JSOC) compound between Malvesti Street to the east and the JSOC compound limits to the west. The existing developed site is situated just north of the Butner Road security checkpoint/JSOC Visitors Center. A large existing asphalt parking lot is located directly south of the project site, which serves as general parking for the JSOC compound. The existing parking areas located to the west and north of the existing building are dedicated parking areas for Buildings 3-3242 and 3-3443. The scope of work for the Squadron HQ Addition project includes civil site work and site utilities design along with demolition of the existing site and utilities to support the construction of the new SOF Squadron HQ Addition. The project site is located on a developed site with areas of existing woods and wetlands primarily to the north of the project site and areas of existing grass primarily to the west. This project will disturb 0.041 Ac. of existing wetlands. Ft. Bragg has already received the approved Army Corps of Engineers Nationwide Permit #39 for approval to disturb the above mentioned wetlands. A copy of the approved Nationwide Permit #39 is included in the civil calculation package. Most of the existing parking areas and drive aisles serving this project will be removed and replaced with new parking areas and drive aisles. There is an existing single story office trailer (Building 3-3443) and portions of the existing perimeter unpaved patrol road on the project site that will be removed. The proposed site will disturb greater than 1.0 acre and the built upon area will be greater than 24% of the site area, and is therefore considered a high density project. The state of North Carolina's Stormwater Management Phase II Post Construction ordinance requires new high density development projects to provide stormwater management water quality treatment for the first inch of runoff for the newly created impervious areas and to provide water quantity control for the 1-year storm event. This project is also required to meet LEED accreditation; therefore, water quantity control for the 2-year storm event will be provided. Because this site is an existing developed site, and the stormwater management requirements require only the new impervious areas to be treated, the site has been broken down into one overall area for the purposes of determining the required stormwater management volume requirements. The individual drainage areas for the four bioretention devices have been provided to properly size each bioretention device based upon the actual drainage area it receives. The new building addition's Pagel of 2 . . 1 impervious area is treated in Bioretention Facility #2, and Bioretention Facility #1, #3, and #4 primarily receive drainage from both existing and new parking lot impervious areas. Both water quality and water quantity stormwater management are provided in the four bioretention areas. Water quality control is provided for the first inch of runoff and the bioretention areas provide 85% total suspended solids removal. Water quantity control for the 1- and 2-year storm events is also provided in the proposed bioretention devices such that development runoff rates are less than predeveloped conditions for the project. The existing off -site impervious areas that drain to the bioretention areas have been accounted for in the proposed bioretention areas with respect to both the water quality and water quantity stormwater management requirements. The analysis followed the Simple method and other generally accepted engineering practices. The Simple method was used to calculate the required stormwater management volumes by subtracting the pre -developed runoff coefficient from the post -developed runoff coefficient and inserting that value into the Simple method formula, thus the volume associated with the newly created impervious areas is being treated and accounted for. The developed site will add 19,773 sf of impervious area and the bioretention areas receive and treat 24,726 sf of impervious areas. The required 1-year quantity management is 4,746 cf and the bioretention devices provide 5,798 cf of storage. The drainage areas were delineated from field prepared topographic survey. Existing impervious area calculations were based on existing field surveys. Post development impervious areas were based on the proposed site plan. A geotechnical engineer calculated the infiltration rates of the existing soils and determined that the infiltration rate of the soils were expected to be significantly less than 2.00" an hour; therefore, perforated underdrain piping in a stone layer is provided at the bottom of all four bioretention areas. All four bioretention areas will have a ponding depth of 12-inches with an overflow inlet structure connecting to the storm drain outlet structure system. The overflow inlet structure's grate will be set at the ponding depth elevation with adequate freeboard provided above the ponding depth elevation. The four bioretention areas will be planted with grass, shrubs, and or trees and will have either 2 or 4-feet of soil media beneath the planting material. The water quality volume requirements will be provided in the surface ponding volume and the water quantity volume requirements will be provided using a combination of the surface ponding volume and the void space volume in the soil media and stone within the limits of the bioretention areas. The bottom of the bioretention areas are at least 2.0' feet above the seasonal high water elevation as determined by the project geotechnical engineer. The seasonal high water table was determined to be at elevation 230.00 and the bottom of the bioretention areas vary from either 233.00 or 232.00. The design storm events 1, and 2-year were based on the rainfall data from NRCS for Cumberland County, NC. Per conversations with NCDENR DWQ, the stormwater management design approach as presented here is acceptable. Page 2 of 2 Permit Number: (to be provided by DWD) 1 _ A.;Y YlFifyOL CLO f NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM BIORETENTION CELL SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information. L PROJECT INFORMATION_ Project name JSOC SOF Squadron HO Addition (LI 60821) - Contact name Jason Sesler Phone number (919) 325A777 - Date September 9, 2011 Drainage area number Bioretention Area #1 (Drainage Area 1I II.- DESIGN ,INFORMATION „ Site Characteristics Drainage area 13,986 ft' Impervious area 7,005 R' Percent impervious 50.1% % Design rainfall depth -- 1.0 inch Peak Flow Calculations Is pre/post control of the 1-yr, 24-hr peak flow required? Y _ (Y or N) 1-yr, 24-hr runoff depth 3.2 in 1-yr, 24-hr intensity - 5.22 in/hr Pre -development 1-yr, 24-hr peak flow - ft'/sec Post -development 1-yr, 24-hr peak flow - - ft'/sec Pre/Post 1-yr, 24-hr peak control ft'/sec Storage Volume: Non-SAWaters Minimum volume required 581.0 ft' Volume provided - 606.0 ft' OK Storage Volume: SAWaters 1.5' runoff volume ft' Pre -development 1-yr, 24-hr runoff ry' 1 Post -development 1-yr, 24-hr runoff .. ry' \\\n C ARO Minimum volume required 0 ft' "\Q. SSi ••;/y �Q.•.9 Volume provided ry3 _ . pF� Cell Dimensions = • a S E A Ei Fording depth of water 12 inches OK - 2 1 7 7 Fording depth of water 1.00 ft •• �.N : Surface area of the top of the bioretention cell -: 606.0 ftZ OK E G I NLengthi 44 It OK 7,/ Width: - ft OK I1IIIS0S\\\\ Zol( �• -or- Radius If IS , rV Media and Soils Summary Drawdown time, ponded volume 9.6 hr OK Drawdown time, to 24 inches below surface - 15.3 hr OK Drawdown time, total: 24.9 hr In -situ soil.. Soil permeability 0.10 in/hr Insufficient. Increase infiltration rate or include underdrains. Planting media soil: Soil permeability 0.52 in/hr OK Soil composition • Sand (by volume) 85% OK • Fines (by volume) 10% OK • Organic (by volume) 5% OK Total 100% Phosphorus Index (P-Index) of media 30 (unitless) OK Form SW401-aioretentlon-Rev.8 June 25, 2010 Parts I and II. Design Summary, Page 1 of 2 Basin Elevations Permit Number: (to be provided by DWQ) Temporary pool elevation 239.00 fmsl Type of bioretention cell (answer "Y' to only one of the two following questions): Is this a grassed cell? (Y or N) Is this a cell with trees/shrubs? y (Y or N) Planting elevation (top of the mulch or grass sod layer) :. 238 fmsl Depth of mulch 0 inches Bottom of the planting media soil = 234 first Planting media depth 4 it Depth of washed sand below planting media soil - 0 ft Are underdrains being installed? Y (Y or N) How many clean out pipes are being installed? 4 What factor of safety is used for sizing the underdrains? (See 2 BMP Manual Section 12.3.6) Additional distance between the bottom of the planting media and 1 it bottom of the cell to account for underdrains Bottom of the cell required 233 fmsl SHWT elevation 230 fmsl Distance from bottom to SHWT 3 it Internal Water Storage Zone (IWS) Does the design include IWS — N `- (Y or N) Elevation of the top of the upturned elbow fmsl Separation of IWS and Surface 238 ft Planting Plan Number of tree species 1 Number of shrub species 2 Number of herbaceous groundcover species 3 Additional Information Does volume in excess of the design volume bypass the Y (Y or N) bioretenlion cell? Does volume in excess of the design volume flow evenly distributed Y (Y or N) through a vegetated filter? What is the length of the vegetated filter? 30 ft Does the design use a level spreader to evenly distribute flow? N '' (Y or N) Is the BMP located at least 30 feel from surface waters (50 feet if - Y (Y or N) SA waters)? Is the BMP located at least 100 feet from water supply wells? " Y (Y or N) Are the vegetated side slopes equal to or less than 3:1? Y (Y or N) Is the BMP located in a proposed drainage easement with access Y (Y or N) to a public Right of Way (ROW)? Inlet velocity (from treatment system) 1 ft/sec Is the area surrounding the cell likely to undergo development in N (Y or N) the future? - Are the slopes draining to the Norelention cell greater than 20%? N Is the drainage area permanently stabilized? Pretreatment Used (Indicate Type Used with an "X' in the shaded cell) Gravel and grass (81inches gravel followed by 3-5 it of grass) Grassed Swale Forebay Other Y_ (Y or N) (Y or N) X OK media depth Insufficient mulch depth, unless installing grassed cell. OK OK Cl: OK 79 OK Show how flow is evenly distributed OK OK OK OK OK OK OK OK y Form SW401-Bioretention-Rev.8 June 25, 2010 Parts I and II. Design Summary, Page 2 of 2 Permtt No: Ito be assigned by DWQJ IIf- REQUIRED ITEMS .CHECKLISTT'�.��'" Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Pagel Plan Initials Ts's' Sheet No. -4107. 1. Plans (1' - 50' or larger) of the entire site showing: C61o$ - Design at ultimate build -out, C-S.il -Off-site drainage (if applicable), C- r f 3 - Delineated drainage basins (include Rational C coefficient per basin), - Cell dimensions, - Pretreatment system, - High flow bypass system, - Maintenance access, - Recorded drainage easement and public right of way (ROW), - Clean out pipe locations, - Overflow device, and - Boundaries of drainage easement. ux1. G-1 iL 2. Plan details IV = 30' or larger) for the bioretention cell showing: G SIB Cell dimensions - Pretreatment system, - High flow bypass system, - Maintenance access, - Recorded drainage easement and public right of way (ROW), - Design at ultimate build -out, - Off -site drainage (if applicable), - Clean out pipe locations, - Overflow device, and - Boundaries of drainage easement. Indicate the P-Index between 10 and 30 3. Section view of the bioretention cell IV = 20' or larger) showing: - Side slopes, 3:1 or lower - Underdrain system (if applicable), and - Biorelention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable), SHWT level(s), and overflow structure] �f'f- _ Sn1 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The WALT results of the soils report must be verified in the field by DWQ, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in situ soil must include: - Soil permeability, LJ 161 - Soil composition (% sand, % fines, % organic), and - P-index. 5. A detailed planting plan (I" = 20' or larger) prepared by a qualified individual showing: L49 So A variety of suitable species, - Sizes, spacing and locations of plantings, - Total quantity of each type of plant specified, - A planting detail, - The source nursery for the plants, and - Fertilizer and watering requirements to establish vegetation. Ti. jr, 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the entire drainage area is stabilized. �rJrf. GgCu 7, The supporting calculations (including underdrain calculations, if applicable). 5 3 S• 'I TflC tq E98 A copy of the signed and notarized inspection and maintenance (I&M) agreement. z f S, r lQ 9. A copy of the deed restriction. Form SW401-13ioretemw-Rev 7 Part III, Page 1 of 1 permit Number: (to be provided by DWQ) Drainage Area Number: Bioretention Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. Important operation and maintenance procedures: — Immediately after the bioretention cell is established, the plants will be watered twice.weekly if needed until the plants become established (commonly six weeks). — Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell. — Heavy equipment will NEVER be driven over the bioretention cell. — Special care will be taken to prevent sediment from entering the bioretention cell. — Once a year, a soil test of the soil media will be conducted. After the bioretention cell is established, I will inspect it once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblems: How I will remediate theproblem: The entire BMP Trash/debris is present. Remove the trash debris. The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to bioretention cell erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a . one-time fertilizer application. The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the stone verge or swale applicable). sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged (if applicable). Erosion is occurring in the Regrade the swale if necessary to swale (if applicable). smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and clogged covered in sediment (if stone and replace with clean stone. applicable). Form SW401-Bioretention O&M-Rev.3 Page 1 of BMP element: Potentialproblems: How I will remediate theproblem: The pretreatment area Plow is bypassing Regrade if necessary to route all pretreatment area and/or flow to the pretreatment area. gullies have formed. Resaabilize the area after grading. Sediment has accumulated to Search for the source of the a depth greater than three sediment and remedy the problem if inches. possible. Remove the sediment and restabilize the pretreatment area. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. The bioretention cell: Best professional practices Prune according to best professional vegetation show that pruning is needed practices. to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Tree stakes/wires are present Remove tree stake/wires (which six months after planting. can kill the tree if not removed). The bioretention cell: Mulch is breaking down or Spot mulch if there are only random soils and mulch has floated away. void areas. Replace whole mulch layer if necessary. Remove the remaining much and replace with triple shredded hard wood mulch at a maximum depth of three inches. Soils and/or mulch are Determine the extent of the clogging clogged with sediment. - remove and replace either just the top layers or the entire media as needed. Dispose of the spoil in an appropriate off -site location. Use triple shredded hard wood mulch at a maximum depth of three inches. Search for the source of the sediment and remedy the problem if possible. An annual soil test shows that Dolomitic lime shall be applied as pUl has dropped or heavy recommended per the soil test and metals have accumulated in toxic soils shall be removed, the soil media. disposed of properly and replaced with new planting media. Form SW401-Bioretention Od M-Rev.3 Page 2 of 4 BMP element: Potentialproblems: How I will remediate theproblem: The underdrain system Clogging has occurred. Wash out the underdrain system. if applicable) The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of the sediment off -site. The drop inlet is damaged Repair or replace the drop inlet. The receiving water Erosion or other signs of Contact the NC Division of Water damage have occurred at the Quality 401 Oversight Unit at 919- outlet. 733-1786. Fonn SW401-Bioretention O&M-Rev.3 Page 3 of 4 Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to.the system or responsible party. Project name:JSOC, SOF Squadron FIO Addition (LI 60821) BUP drainage area number: Print name:Mr. David Heins Title:DPW/Environmental Division Chief' Address:2175 Reilly Road Stop A, Fort Bragg, NC 28310 Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. a Notary Public for the State of County of , do hereby certify that personally appeared before me this day of , and acknowledge the due execution of the forgoing bioretention maintenance requirements. Witness my hand and official seal, SEAL My commission Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4 Permit Number: (to be provided by DWQ) ®RWA o=eF wATE9Of NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM BIORETENTION CELL SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information. I; PROJECT INFORMATION Project name JSOC, SOF Squadron HQ Addition (1-I60821) Contact name Jason Sesler Phone number Date Drainage area number (919) 325-4777 September 9, 2011 Bioretenllon Area #2 (Drainage Area #2) - II. DESIGN INFORMATION_ " Site Characteristics Drainage area Impervious area Percent impervious Design rainfall depth Peak Flow Calculations Is pre/post control of the 1-yr, 24-hr peak flow required? 1-yr, 24-hr runoff depth 1-yr, 24-hr intensity Pre -development 1-yr, 24-hr peak flow Post -development 1-yr, 24-hr peak flow Pre/Post 1-yr, 24-hr peak control Storage Volume: Non -SA Waters Minimum volume required Volume provided Storage Volume: SA Waters 1.5' runoff volume Pre -development 1-yr, 24-hr runoff Post -development 1-yr, 24-hr runoff Minimum volume required Volume provided Cell Dimensions Pending depth of water Pending depth of water Surface area of the top of the bioretention cell Length. Width: -or- Radius Media and Soils Summary Drawdown time, ponded volume Drawdown time, to 24 inches below surface Drawdown time, total: In -situ soil: Soil permeability Planting media soil: Soil permeability Soil composition • Sand (by volume) • Fines (by volume) • Organic (by volume) Phosphorus Index (P-Index) of media Form SW401-Bioretention-Rev.8 June 25, 2010 9,131 ftz 7,260 ftz 79.5% % 1.0 inch Y (YorN) 3.2 in 5.22 in/hr ft'/sec ft'/sec 587.0 ft' 1 615.0 ft' OK J��� \ C A W _ SEAL 9 2177� Off' ` lIISIHIS0S\��� -- 12inches OK 1.00 If 15 f 615.0 ft2 OK 33 ft OK --' 19ft OK It 8 hr OK 12.8 hr OK 20.8 hr 0.10 in/hr Insufficient. Increase infiltration rate or include underdrains. 0.52 Whir OK 85% OK 10% OK 5% OK Total: 100% 30 (unilless) OK 201, Parts I and II. Design Summary, Page 1 of 2 Permit (to be provided by DV✓Q) t Basin Elevations Temporary pool elevation 236.00 fmsl Type of bioretention cell (answer'Y' to only one of the two following questions): Is this a grassed cell? Y (Y or N) Is this a cell with trees/shrubs? ,- - '(Y or N) Planting elevation (top of the mulch or grass sod layer) 235 fmsl Depth of mulch 0 inches . Bottom of the planting media soil - 233 fmsl Planting media depth 2 If Depth of washed sand below planting media soil 0 ft Are underdrains being installed? '. Y '- (Y or N) How many clean out pipes are being installed? 3 What factor of safety is used for sizing the underdrains? (See 2 BMP Manual Section 12.3.6) Additional distance between the bottom of the planting media and 1 ft the bottom of the cell to account for underdrains Bottom of the cell required 232 fmsl SHWT elevation 230 fmsl Distance from bottom to SHWT 2 It Internal Water Storage Zone (IWS) Does the design include IWS N (Y or N) Elevation of the top of the upturned elbow fmsl Separation of IWS and Surface 235 ft Planting Plan Number of tree species _ Number of shrub species Number of herbaceous groundcover species _ Additional Information Does volume in excess of the design volume bypass the bioretention cell? Does volume in excess of the design volume Flow evenly distributed through a vegetated filler? - What is the length of the vegetated filter? Does the design use a level spreader to evenly distribute flow? OK Insufficient mulch depth, unless installing grassed cell. OK C07.6 -Y (Y or N) OK Y (YorN) OK if) ft N (Y or N) Show how flow is evenly distributed. Is the BMP located at least 30 feel from surface waters (50 feet if Y - (Y or N) OK SA waters)? Is the BMP localed at least 100 feet from water supply wells? - Y (Y or N) OK Are the vegetated side slopes equal to or less than 3:1? Y (Y or N) OK Is the BMP located in a proposed drainage easement with access- Y (Y or N) OK to a public Right of Way (ROW)? Inlet velocity (from treatment system) _ 1 fYsec OK Is the area surrounding the cell likely to undergo development in N (Y or N) OK the future? Are the slopes draining to the bioretention cell greater than 20%? N (Y or N) OK Is the drainage area permanently stabilized? Y (Y or N) OK Pretreatment Used (Indicate Type Used with an'X' in the shaded cell) Gravel and grass (flinches gravel followed by 3-5 ft of grass) Grassed Swale - #VALUE! Forebay - Other X Form SW401-Bioretention-Rev.8 June 25, 2010 Parts I and II. Design Summary, Page 2 of 2 Permft No: (to be assigned by DWQ) 1113:REgUIREDITEMSCHECKLIST ` t^ Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Page/ Plan Sheet No. TInitials J�JO. CGI 01 1. Plans (1- - 50' or larger) of the entire site showing: 66109 - Design at ultimate build -out, p Z - Off -site drainage (if applicable), gl) - Delineated drainage basins (include Rational C coefficient per basin), - Cell dimensions, - Pretreatment system, - High Flow bypass system, - Maintenance access, - Recorded drainage easement and public right of way (ROW), - Clean out pipe locations, - Overflow device, and - Boundaries of drainage easement. SJ.J. s'IL 2. Plan details (1' = 30' or larger) for the bioretention cell showing: Cell dimensions - Pretreatment system, - High flow bypass system, - Maintenance access, - Recorded drainage easement and public right of way (ROW), - Design at ultimate build -out, - Off -site drainage (if applicable), - Clean out pipe locations, - Overflow device, and - Boundaries of drainage easement. _ �.J. f• G SI Z - Indicate the P-Index between 10 and 30 3. Section view of the bioretention cell (1' = 20' or larger) showing: - Side slopes, 3:1 or lower - Underdrain system (if applicable), and - Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable), Sr'f j, SHWT level(s), and overflow structure) 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the soils report must be verified in the field by DWQ, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in situ soil must include: - Soil permeability, - Soil composition (%sand, %fines, % organic), and f 4� pL - P-index. 5. A detailed planting plan (1' = 20' or larger) prepared by a qualified individual showing: SO - Avarietyofsuitablespecies, - Sizes, spacing and locations of plantings, - Total quantity of each type of plant specified, - A planting detail, - The source nursery for the plants, and - Fertilizer and watering requirements to establish vegetation. _ 54 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the entire drainage area is stabilized. 7. The supporting calculations (including underdrain calculations, if applicable). TbJ. QT—,414 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement. J, . / r M /a 9. A copy of the deed restriction, Form SW401-Bioretention-Rev.7 Part III, Page 1 of 1 Permit Number. (to be provided by DWQ) Drainage Area Number: Bioretention Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. Important operation and maintenance procedures: — Immediately after the bioretention cell is established, the plants will be watered twice weekly if needed until the plants become established (commonly six weeks). — Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell. — Heavy equipment will NEVER be driven over the bioretention cell. — Special care will be taken to prevent sediment from entering the bioretention cell. — Once a year, a soil test of the soil media will be conducted. After the bioretention cell is established, I will inspect it once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblems: How 1 will remediate theproblem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to bioretention cell erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. The inlet device: pipe, stone verge or swale The pipe is clogged (if applicable). Unclog the pipe. Dispose of the sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged (if applicable). Erosion is occurring in the Regrade the swale if necessary to swale (if applicable). smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and clogged covered in sediment (if stone and replace with clean stone. applicable). Form SW401-Bioretention O&M-Rev.3 Page 1 of 4 BMP element: Potentialproblems: How I will remediate theproblem: The pretreatment area Plow is bypassing Regrade if necessary to route all pretreatment area and/or flow to the pretreatment area. gullies have formed. Restabilize the area after grading. Sediment has accumulated to Search for the source of the a depth greater than three sediment and remedy the problem if inches. possible. Remove the sediment and restabilize the pretreatment area. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. The bioretention cell: Best professional practices Prune according to best professional vegetation show that pruning is needed practices. to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Tree stakes/wires are present Remove tree stake/wires (which six months after planting. can kill the tree if not removed). The bioretention cell: Mulch is breaking down or Spot mulch if there are only random soils and mulch has floated away. void areas. Replace whole mulch layer if necessary. Remove the remaining much and replace with triple shredded hard wood mulch at a maximum depth of three inches. Soils and/or mulch are Determine the extent of the clogging clogged with sediment. - remove and replace either just the top layers or the entire media as needed. Dispose of the spoil in an appropriate off -site location. Use triple shredded hardwood mulch at a maximum depth of three inches. Search for the source of the sediment and remedy the problem if possible. An annual soil test shows that Dolomitic lime shall be applied as pH has dropped or heavy recommended per the soil test and metals have accumulated in toxic soils shall be removed, the soil media. disposed of properly and replaced with new planting media. Form SW401-Bioretention O&M-Rev.3 Page 2 of 4 BMP element: Potentialproblems: flow I will remediate theproblem: The underdrain system Clogging has occurred. Wash out the underdrain system. if applicable) The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of the sediment off -site. The drop inlet is damaged Repair or replace the drop inlet. The receiving water Erosion or other signs of Contact the NC Division of Water damage have occurred at the Quality 401 Oversight Unit at 919- outlet. 733-1786. Form SW401-13ioretention O&M-Rev.3 Page 3. of 4 Permit Number: (to be provided by DIVQ) 1 acknowledge and agree by my signature below that 1 am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project narne:.ISOC, SOF Squadron HO Addition (LI 60821) BMP drainage area Print name: Title:DPW/Environmental Division Chief Address:2175 Reilly Road Stop A, Fort Bra"—, NC 28310 Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. a Notary Public for the State of , County of , do hereby certify that personally appeared before me this day of , and acknowledge the due execution of the forgoing bioretention maintenance requirements. Witness my hand and official seal, SEAL. My commission expires Form SW401-Bioretention I&M-Rev. 2 Page 4 of 4 Permit Number' (to be provided by DWQ) AM o�eF wArs i g NCDENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM BIORETENTION CELL SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information. Is PROJECT. -INFORMATION = >_. Project name JSOC, SOF Squadron HQ Addition (LI 60821) Contact name Jason Sesler Phone number (919) 325-4777 Date September 9, 2011 _ Drainage area number Bioretenbon Area #3 (Drainage Area #3) - II. DESIGN, INFORMATION:' Site Characteristics Drainage area 12,867 112 Impervious area 8,460 ft2 Percent impervious 65.7% % Design rainfall depth 1.0 inch Peak Flow Calculations Is pre/post control of the 1-yr, 24-hr peak flow required? ': Y' ":. (Y or N) 1-yr, 24-hr runoff depth 3.2 in 1-yr, 24-hr intensity 5.22 in/hr Pre -development 1-yr, 24-hr peak flow ft'/sec Post -development 1-yr, 24-hr peak flow ft3/sec Pre/Post 1-yr, 24-hr peak control ft'/sec Storage Volume: Non -SA Waters Minimum volume required 701.0 fl3 Volume provided 734.0 ft' Storage Volume: SA Waters 1.5' runoff volume ft3 Pre -development 1-yr, 24-hr runoff : ft3 Post -development 1-yr, 24-hr runoff ft3 Minimum volume required 0 ft3 Volume provided ft3 Cell Dimensions Ponding depth of water Ponding depth of water Surface area of the top of the bioretention cell Length: Width: -or- Radius Media and Soils Summary Drawdown time, ponded volume Drawdown time, to 24 inches below surface Drawdown time, total: In -situ soil: Soil permeability Planting media soil. Soil permeability Soil composition % Sand (by volume) • Fines (by volume) • Organic (by volume) 12 inches 1.00 1t 734.0 ftz 50 ft 16 ft ft 9.6 hr 15.3 hr 24.9 hr 0.10 in/hr 0.52 in/hr OK An OK OK OK OK OK CARO�ii�� .� p`r 'FESS/O • �?' �� Q SEAL 2 1777 GINE� S 7;OAIIIIIIS�S\\\\ 2oI� /jam f Insufficient. Increase infiltration rate or include underdrains. 85% OK 10% OK 5% OK Total: 100% Phosphorus Index (P-Index) of media 30 (unitless) OK Form SW401-Bioretention-Rev.8 June 25, 2010 Parts I and II. Design Summary, Page 1 of 2 Permit Number: (to be provided by DV✓Q) r Basin Elevations Temporary pool elevation 238.00 fmsl Type of biorelention cell (answer *Y" to only one of the two following questions): Is this a grassed cell? (Y or N) Is this a cell with trees/shrubs? Y (Y or N) OK media depth Planting elevation (top of the mulch or grass sod layer) 237 fmsl Depth of mulch - 0 inches Insufficient mulch depth, unless installing grassed cell. Bottom of the planting media soil 233 fmsl Planting media depth 4 it Depth of washed sand below planting media soil 0 If Are underdrains being installed? Y (Y or N) How many clean out pipes are being installed? 1 OK What factor of safety is used for sizing the underdrains? (See 2 OK BMP Manual Section 12.3.6) Additional distance between the bottom of the planting media and 1 ft the bottom of the cell to account for underdrains Bottom of the cell required 232 fmsl SHWT elevation 230 fmsl Distance from bottom to SHWT 2 it OK Internal Water Storage Zone (IWS) Does the design include IWS N (Y or N) Elevation of the top of the upturned elbow fmsl Separation of IWS and Surface 237 it Planting Plan Number of tree species 1 Number of shrub species 2 Number of herbaceous groundcover species 3 OK Additional Information Does volume in excess of the design volume bypass the - Y (Y or N) OK biorelention cell? Does volume in excess of the design volume flow evenly distributed Y (Y or N) OK through a vegetated filter? _..... What is the length of the vegetated filler? 30 it Does the design use a level spreader to evenly distribute flow? N (Y or N) Show how flow is evenly distributed Is the BMP located at least 30 feet from surface waters (50 feet if -Y (Y or N) OK SA waters)? - Is the BMP localed at least 100 feet from water supply wells? Y (Y or N) OK Are the vegetated side slopes equal to or less than 3:1? Y (Y or N) OK Is the BMP located in a proposed drainage easement with access Y (Y or N) OK to a public Right of Way (ROW)? Inlet velocity (from treatment system) - 1 f 1sec OK Is the area surrounding the cell likely to undergo development in N (Y or N) OK the future? Are the slopes draining to the bioretention cell greater than 20%? N: (Y or N) OK Is the drainage area permanently stabilized? Y (Y or N) OK Pretreatment Used (Indicate Type Used with an "X' in the shaded cell) Gravel and grass (8inches gravel followed by 3-5 ft of grass) Grassed swale #VALUE' Forebay Other X Form SW401-Bioretention-Rev.8 June 25, 2010 Parts I and II. Design Summary, Page 2 of 2 Permit No: (to be assigned by D WQ) IIU!,REQUIRED'i1TEMS CHECKLIST" Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Pagel Plan Initials Sheet No. �•J •(• CC101 1. Plans (1' - 50' or larger) of the entire site showing: cc, 0? - Design at ultimate build -out, G`SI2 - Off -site drainage (if applicable), - Delineated drainage basins (include Rational C coefficient per basin), G-Sty -Celldimensions, - Pretreatment system, - High flow bypass system, - Maintenance access, - Recorded drainage easement and public right of way (ROW), - Clean out pipe locations, - Overflow device, and - Boundaries of drainage easement. 2. Plan details (1' = 30' or larger) for the Bioretention cell showing: Sty G' -Celldimensions - Pretreatment system, - High flow bypass system, - Maintenance access, - Recorded drainage easement and public right of way (ROW), - Design at ultimate build -out, - Off -site drainage (if applicable), - Clean out pipe locations, - Overflow device, and - Boundaries of drainage easement. _ SI Z - Indicate the P-Index between 10 and 30 3. Section view of the bioretention cell (P = 20' or larger) showing: - Side slopes, 3:1 or lower - Underdrain system (if applicable), and - Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable), Sa:Ls SHWT level(s), and overflow structure] U J. 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The Wd-T results of the soils report must be verified in the field by DWQ, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. All elevations shall be in feel mean sea level (first), Results of soils tests of both the planting soil and the in situ soil must include: - Soil permeability, - Soil composition (% sand, % fines, % organic), and fL LP101 - P-index. 5. A detailed planting plan (1' = 20' or larger) prepared by a qualified individual showing: LPIOL - A variety of suitable species, �Qy DI - Sizes, spacing and locations of plantings, - Total quantity of each type of plant specified, - A planting detail, - The source nursery for the plants, and - Fertilizer and watering requirements to establish vegetation. 7,14. (6101 6. A construction sequence that shows how the Bioretention cell will be protected from sediment until the entire drainage area is stabilized. 7 The supporting calculations (including underdrain calculations, if applicable). a J • J. Arr"I, e+fd B. A copy of the signed and notarized inspection and maintenance (AM) agreement. S S• J. 1J1eq g, A copy of the deed restriction. Form SW401-Bioretention-Rev.7 Part III, Page 1 of 1 Permit Number: (to be provided by DWQ) Drainage Area Number: Bioretention Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. Important operation and maintenance procedures: — Immediately after the bioretention cell is established, the plants will be watered twice weekly if needed until the plants become established (commonly six weeks). — Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell. — Heavy equipment will NEVER be driven over the bioretention cell. — Special care will betaken to prevent sediment from entering the bioretention cell. — Once a year, a soil test of the soil media will be conducted. After the bioretention cell is established, I will inspect it once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblems: How I will remediate theproblem: The entire BMP Trash/debris is present. Remove the trash/debris. The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to bioretention cell erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide time and a one-time fertilizer application. The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the stone verge or swale applicable). sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged (if applicable). Erosion is occurring in the Regrade the swale if necessary to swale (if applicable). smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and clogged covered in sediment (if stone and replace with clean stone. applicable). Form SW401-Bioretention O&M-Rev.3 Page 1 of 4 BMP element: Potentialproblems: How I will remediate theproblem: The pretreatment area Flow is bypassing Regrade if necessary to route all pretreatment area and/or flow to the pretreatment area. gullies have formed. Restabilize the area after grading. Sediment has accumulated to Search for the source of the a depth greater than three sediment and remedy the problem if inches. possible. Remove the sediment and restabilize the pretreatment area. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. The bioretention cell: Best professional practices Prune according to best professional vegetation show that pruning is needed practices. to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Tree stakes/wires are present Remove tree stake/wires (which six months after planting. can kill the tree if not removed). The bioretention cell: Mulch is breaking down or Spot mulch if there are only random soils and mulch has Floated away. void areas. Replace whole mulch layer if necessary. Remove the remaining much and replace with triple shredded hard wood mulch at a maximum depth of three inches. Soils and/or mulch are Determine the extent of the clogging clogged with sediment. - remove and replace either just the top layers or the entire media as needed. Dispose of the spoil in an appropriate off -site location. Use . triple shredded hard wood mulch at a maximum depth of three inches. Search for the source of the sediment and remedy the problem if possible. An annual soil test shows that Dolomitic time shall be applied as pH has dropped or heavy recommended per the soil test and metals have accumulated in toxic soils shall be removed, the soil media. disposed of properly and replaced with new planting media. Form SW401-Bioretention O&M-Rev.3 Page 2 of 4 BMP element: Potentialproblems: How I will remediate theproblem: The underdrain system Clogging has occurred. Wash out the underdrain system. if applicable) The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of the sediment off -site. The drop inlet is damaged Repair or replace the drop inlet. The receiving water Erosion or other signs of Contact the NC Division of Water damage have occurred at the Quality 401 Oversight Unit at 919- outlet. 733-1786. Form SW401-Bioretention O&M-Rev.3 Page 3 of 4 Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project name:,ISOC, SOP Squadron 1-10 Addition (LI 60821) 6MP drainage area Print name:Mr. David Heins Title:DPW/Enviromnental Division Chief Address:2175 Reilly Road Stop A, Port Bragg, NC 28310 Date: Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, , a Notary Public for the State of County of do hereby certify that personally appeared before me this day of , and acknowledge the due execution of the forgoing bioretention maintenance requirements. Witness my hand and official seal, SEAL My commission Form SW401-Dioretention 1&M-Rev. 2 Page 4 of Permit Number: (to be provided by DWQ) STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM BIORETENTION CELL SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part III) must be printed, filled out and submitted along with all of the required information. Project name JSOCI. SOF Squadron HQ Addition (LI 60821) Contact name Jason Sesler Phone number (919) 325-4777 Date September 9 2011 - Drainage area number Bioretention Area #4 (Drainage Area #4) - Site Characteristics Drainage area 4,208 ft' Impervious area -- 2,001 ftz Percent impervious 47.6% % Design rainfall depth - 1.0 inch Peak Flow Calculations Is pre/post control of the 1-yr, 24-hr peak Flow required? Y (Y or N) 1-yr, 24-hr runoff depth 3.2 in 1-yr, 24-hr intensity . 5.22 inthr Pre -development 1-yr, 24-hr peak flow - ft'/sec Post -development 1-yr, 24-hr peak flow ft'/sec Pre/Post 1-yr, 24-hr peak control ft'/sec Storage Volume: Non -SA Waters Minimum volume required 175.0 ft' \Vky(111II!/y/ Volume provided 193.0ft' OK \\��CARO7i��i Storage Volume: SA Waters 1.5' runoff volume ft'Z7?, �OF G�'9�Q}"•9 Pre -development 1-yr, 24-hr runoff ft' = SEAL/ Post -development 1-yr, 24-hr runoff ft' � 3 21 7 7 Minimum volume required 0 ft' Volume provided ft' GINE�"F��� Cell Dimensions iii N S. SE Ponding depth of water 12inches OK 7jr/IIIll1�\�1 ��l Ponding depth of water 1.00 it l r Surface area of the lop of the biorelention cell 193.0 ftZ OK Length: 20 ft OK Width: 10 ft OK -or-Radius ft Media and Soils Summary Drawdown time, ponded volume 8 hr OK Drawdown time, to 24 inches below surface 12.8 hr OK Drawdown time, total: 20.8 hr In -situ soil: Soil permeability 0.10 in/hr Insufficient. Increase infiltration rate or include underdrains. Planting media soil: Soil permeability 0.52 in/hr OK Soil composition • Sand (by volume) 85% OK • Fines (by volume) 10% OK • Organic (by volume) 5% OK Total: 100% Phosphorus Index (P-Index) of media 30 (unitless) OK Form SW401-Bioretention-Rev.8 June 25, 2010 Parts I and II. Design Summary, Page 1 of 2 Permit Number' (fa be Provided by DWQ) Basin Elevations Temporary pool elevation Type of bioretention cell (answer "Y' to only one of the two following questions): Is this a grassed cell? Is this a cell with trees/shrubs? Planting elevation (top of the mulch or grass sod layer) Depth of mulch Bottom of the planting media soil Planting media depth Depth of washed sand below planting media soil Are underdrains being installed? How many clean out pipes are being installed? What factor of safety is used for sizing the underdrains? (See BMP Manual Section 12.3.6) Additional distance between the bottom of the planting media and the bottom of the cell to account for underdrains Bottom of the cell required SHWT elevation Distance from bottom to SHWT Internal Water Storage Zone (IWS) Does the design include IWS Elevation of the top of the upturned elbow Separation of IWS and Surface Planting Plan Number of tree species Number of shrub species Number of herbaceous groundcover species Additional Information Does volume In excess of the design volume bypass the bioretention cell? Does volume in excess of the design volume Flow evenly distributed through a vegetated f Itef? What is the length of the vegetated filter? Does the design use a level spreader to evenly distribute Flow? Is the BMP located at least 30 feet from surface waters (50 feet if SA waters)? Is the BMP located at least 100 feet from water supply wells? Are the vegetated side slopes equal to or less than 3:1? Is the BMP located in a proposed drainage easement with access to a public Right of Way (ROW)? Inlet velocity (from treatment system) Is the area surrounding the cell likely to undergo development in the future? Are the slopes draining to the bioretention cell greater than 20%? Is the drainage area permanently stabilized? Pretreatment Used (Indicate Type Used with an "X" in the shaded cell) Gravel and grass (Binches gravel followed by 3-5 ft of grass) Grassed Swale Forebay Other 236.00 fmsl Y (YorN) (Y or N) 235 fmsl 0 inches 233 fmsl 2tt Ott Na Insufficient mulch depth, unless installing grassed cell. Y.. - (YorN) 2 OK 2 OK 1 ft 232 fmsl 230 fmsl 2 It OK N (YorN) fmsl 235 If Y... (YorN) OK Y (YorN) OK 30 It N (Y or N) Show how Flow is evenly distributed. Y (YorN) OK Y (Y or N) OK Y -. (YorN) OK Y (Y or N) OK 1 fusee N (Y or N) N (YorN) Y (Y or N) X OK OK OK OK #VALUE! Form SW401-Biorelention-Reve June 25, 2010 Parts I and II. Design Summary, Page 2 of 2 Permit No: (to be assigned by DWQ) III. REQUIRED`ITEMS CHECKLIST ...`i' Please indicate the page or plan sheet numbers where the supporting documentation can be found. An incomplete submittal package will result in a request for additional information. This will delay final review and approval of the project. Initial in the space provided to indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a requirement has not been met, attach justification. Paget Plan Initials Sheet No. �.3. t C-GloB jrf,I. L�sl'L G-fit? 'art. S� Sr J..J. 1. Plans (1' - 50' or larger) of the entire site showing: - Design at ultimate build -out, - Off -site drainage (if applicable), - Delineated drainage basins (include Rational C coefficient per basin), - Cell dimensions, - Pretreatment system, - High flow bypass system, - Maintenance access, - Recorded drainage easement and public right of way (ROW), - Clean out pipe locations, - Overflow device, and Boundaries of drainage easement. 2. Plan details (1' = 30' or larger) for the bioretention cell showing: - Cell dimensions - Pretreatment system, - High flow bypass system, - Maintenance access, - Recorded drainage easement and public right of way (ROW), - Design at ultimate build -out, - Off -site drainage (if applicable), - Clean out pipe locations, - Overflow device, and - Boundaries of drainage easement. - Indicate the P-Index between 10 and 30 3. Section view of the bioretention cell (1' = 20' or larger) showing: - Side slopes, 3:1 or lower - Underdrain system (if applicable), and - Bioretention cell layers [ground level and slope, pre-treatment, pending depth, mulch depth, fill media depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, underdrains (if applicable), SHWT level(s), and overflow structure) 4. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The results of the soils report must be verified in the field by DWQ, by completing & submitting the soils investigation request form. County soil maps are not an acceptable source of soils information. All elevations shall be in feet mean sea level (fmsl). Results of soils tests of both the planting soil and the in situ soil must include: - Soil permeability, - Soil composition (% sand, %fines, % organic), and �1I - P-index. U' 5. A detailed planting plan (1' = 20' or larger) prepared by a qualified individual showing: LpSol-Avarietyofsuitablespecies, - Sizes, spacing and locations of plantings, - Total quantity of each type of plant specified, - A planting detail, - The source nursery for the plants, and - Fertilizer and watering requirements to establish vegetation. CGI Of 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the entire drainage area is stabilized. CA L" 7. The supporting calculations (including underdrain calculations, if applicable). /-(TI'Ad?Z9 8. A copy of the signed and notarized inspection and maintenance (I&M) agreement. 9. A copy of the deed restriction. Form SW401-Bioretention-Rev.7 Pan in, Page 1 of 1 Permit Number: (to be provided by D IVQ) Drainage Area Number: Bioretention Operation and Maintenance Agreement I will keep a maintenance record on this BMP. This maintenance record will be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the removal efficiency of the BMP. Important operation and maintenance procedures: — Immediately after the bioretention cell is established, the plants will be watered twice weekly if needed until the plants become established (commonly six weeks). — Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell. — Heavy equipment will NEVER be driven over the bioretention cell. — Special care will be taken to prevent sediment from entering the bioretention cell. — Once a year, a soil test of the soil media will be conducted. After the bioretention cell is established, I will inspect it once a month and within 24 hours after every storm event greater than 1.0 inches (or 1.5 inches if in a Coastal County). Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potentialproblems: How I will remediate theproblem: The entire BMP Trash debris is present. Remove the trash/debris. The perimeter of the Areas of bare soil and/or Regrade the soil if necessary to bioretention cell erosive gullies have formed. remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one-time fertilizer application. The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the stone verge or swale applicable). sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged (if applicable). Erosion is occurring in the Regrade the Swale if necessary to swale (if applicable). smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Stone verge is clogged or Remove sediment and clogged covered in sediment (if stone and replace with clean stone. applicable). Form SW401-Bioretention O&M-Rev.3 Page 1 of 4 BMP element: Potentialproblems: How I will remediate theproblem: The pretreatment area Plow is bypassing Regrade if necessary to route all pretreatment area and/or flow to the pretreatment area. gullies have formed. Restabilize the area after grading. Sediment has accumulated to Search for the source of the a depth greater than three sediment and remedy the problem if inches. possible. Remove the sediment and restabilize the pretreatment area. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. The bioretention cell: Best professional practices Prune according to best professional vegetation show that pruning is needed practices. to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Tree stakes/wires are present Remove tree stake/wires (which six months after planting. can kill the tree if not removed). The bioretention cell: Mulch is breaking down or Spot mulch if there are only random soils and mulch has floated away. void areas. Replace whole mulch layer if necessary. Remove the remaining much and replace with triple shredded hard wood mulch at a maximum depth of three inches. Soils and/or mulch are Determine the extent of the clogging clogged with sediment. - remove and replace either just the top layers or the entire media as needed. Dispose of the spoil in an appropriate off -site location. Use triple shredded hard wood mulch at a maximum depth of three inches. Search for the source of the sediment and remedy the problem if possible. An annual soil test shows that Dolomitic time shall be applied as pl-I has dropped or heavy recommended per the soil test and metals have accumulated in toxic soils shall be removed, the soil media. disposed of properly and replaced with new planting media. Form SW40 I -Bioretention O&M-Rev.3 Page 2 of 4 BMP element: Potentialproblems: How I will remediate theproblem: The underdrain system Clogging has occurred. Wash out the underdrain system. if applicable) The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of the sediment off -site. The drop inlet is damaged Repair or re lace the drop inlet. The receiving water Erosion or other signs of Contact the NC Division of Water damage have occurred at the Quality 401 Oversight Unit at 919- outlet. 733-1786. Form SW401-Bioretention O&M-Rev.3 Page 3 of 4 Permit Number: (to be provided by DWQ) I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed above. 1 agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Project naine:JSOC, SOF Squadron HO Addition (LI 60821) 6MP drainage area Print name:Mr. David Heins Title:DPW/Environmental Division Chief Address:2175 Reilly Road Stop A, Fort Brag-, NC 28310 Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. 1, , a Notary Public for the State of County of , do hereby certify that personally appeared before me this day of I , and acknowledge the due execution of the forgoing bioretention maintenance requirements. Witness my hand and official seal, SEAL My commission expi Form SW40 I -Bioretention I&M-Rev. 2 Page 4 of 4