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HomeMy WebLinkAboutSW8080744_HISTORICAL FILE_20091015 (2)STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 O$07,414 DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE 200 C>110 15 YYYYMMDD NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Colleen H. Sullins Governor Director October 15, 2009 Mr. Thomas B. Morris, Senior Vice President First Citizens Bank and Trust Company P.O. Box 27131 Raleigh, NC 27611 Subject: State Stormwater Management Permit No. SW8 080744 MOD First Citizens Bank High Density Commercial Infiltration Trench Project Brunswick County Dear Mr. Morris: Dee Freeman Secretary The Wilmington Regional Office received a complete, modified State Stormwater Management Permit Application for First Citizens Bank on September 24, 2009. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Session Law 2006-246 and Title 15A NCAC 21-1.1000. We are forwarding Permit No. SW8 080744 dated October 15, 2009, for the construction of the subject project. This permit shall be effective from the date of issuance until August 21, 2018, and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611- 7447. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact Christine Nelson, or me at (910) 796-7215. Sincerely, �0'E�� Georgettn Stormwater Supervisor Division of Water Quality GDS/can: S:\WQS\STORMWATER\PERMIT\080744MOD.oct09 cc: Peter A. Bishop, Kimley- Horn and Associates, Inc Brunswick County Building Inspections Jeff Phillips, Brunswick County Engineering Christine Nelson LiWilmington Regional -Office , Central Files Wilminglon Regional Office 127 Cardinal Drive Extension, Wilmington, North Carolina 28405 One 1 Phone: 910-796-72151 FAX: 910350-20041 Customer Service: 1-877-623-6748 Norte t-. l Cdioll na, Internet: www.nmaterquality.org a atUA7//I, An Equal Opportunity \ Affirmative Action Employer �/ V `(i/U State Stormwater Management Systems Permit No. SW8 080744 MOD STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY COMMERCIAL DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Thomas B. Morris & First Citizens Bank and Trust Company First Citizens Bank 8900 East Oak Island Drive, Oak Island, Brunswick County FOR THE construction, operation and maintenance of an underground infiltration trench 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 August 21, 2018, and shall be subject to the following specified conditions and limitations: 1. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.8 on page 3 of this permit. The stormwater control has been designed to handle the runoff from 30,928 square feet of impervious area. A vegetated filter has been waived for this system. 4. The tract will be limited to the amount of built -upon area indicated in Section 1.8 on page 3 of this permit, and per approved plans. This permit does not provide any allocation of built -upon area for future development. 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. Page 2 of 8 State Stormwater Management Systems Permit No. SW8 080744 MOD 6. 7. 8. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. The built -upon areas associated with this project shall be located at least 30 feet landward of all perennial and intermittent streams. The following design criteria have been provided in the infiltration trench and must be maintained at design condition: ffl 01 n. o. P. q r. S. t. Drainage Area, acres: Onsite, ft`: Offsite, ft`: Total Impervious Surfaces, ft`: Onsite, ft`: Offsite, ft`: Design Storm, inches: Trench Length, ft: Trench Width, ft: Trench Height, ft: Number of Stormtech Chambers: Chamber volume, ft': Bottom Elevation, FMSL: Bypass Weir Elevation, FMSL: Permitted Storage Volume, ft': Predevelopment 1 year 24 hour peak flow rate, cfs: Post development 1 yr 24 hour peak flow rate, cfs: Type of Soil: Expected Infiltration Rate, in/hr: SHWT, FMSL: Time to Draw Down, days: Receiving Stream/River Basin: Stream Index Number: Classification of Water Body: II. SCHEDULE OF COMPLIANCE 1.32 57,500 0 30,928 30,928 0 4.06 (1yr-24 hr rainfall depth) 74.27 30 3.5 51 45.9 13.5 17.0 4,525 (pre/post difference) 0.63 1.96 Kureb Fine Sand 10.0 11.5 0.56 UT to Elizabeth River 18-88-9-2-(1) SA/HQW 1. The stormwater management system shall be constructed in its entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The facilities shall be constructed as shown on the approved plans. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 4. 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. Page 3 of 8 State Stormwater Management Systems Permit No. SW8 080744 MOD The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowin.9 and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of bypass structure, filter media, flow spreader, catch basins, piping and vegetated filter. g. A clear access path to the bypass structure must be available at all times. Records of maintenance activities must be kept for each permitted BMP. The records will indicate the date, activity, name of person performing the work and what actions were taken. The permittee shall submit to the Division of Water Quality an annual summary report of the maintenance and inspection records for each BMP. The report shall summarize the inspection dates, results of the inspections, and the maintenance work performed at each inspection. 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. Access to the stormwater facilities shall be maintained via appropriate easements at all times. 10. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, lease or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 11. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. 12. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. Page 4 of 8 State Stormwater Management Systems Permit No. SW8 080744 MOD 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 to any person or entity except after notice to and approval by the Director. At least 30 days prior to making a change of ownership, or a name change of the owner or project, or a mailing address change, the permittee must submit a completed and signed Name/Ownership Change form tc the Division of Water Quality, accompanied by the supporting documentation as listed on the form. The approval of this request will be considered on its merits and may or may not be approved. 2. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer request. 3. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. 4. The issuance of this permit does not preclude the Permittee from complying with any and all statutes, rules, regulations, or ordinances, which may be imposed by other government agencies (local, state, and federal) having jurisdiction. 5. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 6. The permittee grants DENR Staff permission to enter the property during normal business hours for the purpose of inspecting all components of the permitted stormwater management facility. 7. The permit issued shall continue in force and effect until revoked or terminated. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 8. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 9. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 10. The 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 21-1.1000, and NCGS 143-215.1 et.al. Page 5 of 8 State Stormwater Management Systems Permit No. SW8 080744 MOD 11. The permittee shall submit a permit renewal application at least 180 days prior to the expiration date of this permit. The renewal request must include the appropriate documentation and the processing fee. Permit issued this the 15`h day of October, 2009. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION ror coieenjp. 5uurns, Director Division of Water Quality By Authority of the Environmental Management Commission Page 6 of 8 State Stormwater Management Systems Permit No. SW8 080744 MOD First Citizens Bank Stormwater Permit No. SW8 080744 MOD Brunswick County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL Page 7 of 8 State Stormwater Management Systems Permit No. SW8 080744 MOD Certification Requirements: 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The bypass structure elevations are per the approved plan. 6. The bypass structure is located per the approved plans. 7. A Trash Rack is provided on the outlet/bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short- circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. All required design depths are provided. 13. All required parts of the system are provided. 14. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ Regional Office Brunswick County Building Inspections Page 8 of 8 DWQ USE ONLY Defile Received Pee Paid Permit Number O10 "7/y'/9 S100&7A4 7 State of North Carolina Department of Environment and Natural Resource, mxvzj3 Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORIVI1 9 2009 This frw may be photocopied for use as an original BY: I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): First Citizens Bank and Trust Company 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): 'FVtornas Phrxms 13. Morris, Senior Vice President 3. Mailing Address for person listed in item 2 above: State:NC Zip:27611 Phone: (919 . ) 716-8239 Fax: (919 ) 716-8840 EmaiLthomes.morris «firstcitizens.com 4. Project Name (subdivision, facility, or establishment name - should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): 5. Location of Project (sh"cet address): 8900 last Oak Island Drive Cily:Oak Island County:13runswick Zip:28465 6. Directions to project (from nearest major intersection): Project is located in the North East corner of the intersection of East Onk Island Drive and McGlamery Street in the town of Oak Island, North Carolina 7, Latitude:33° 54' 31.81" N Longitude:78' 04' 30.55" W of project 8. Contact person who can answer questions about the project: NameTeter A. Bishop, P.E. 'telephone Number: (919 ) 677-2164 13maikpeter.bishop@kimley-horn.com H. PERMIT INFORMATION: I. Specify whether project is (check one) ❑New ❑Renewal ®Modification Form SWU-101 Version 03.27.08 Page I ol'4 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit numberSWB 080744 and its issue date (if known)08/2"1 /2008 3. Specify the type of project (check one): ❑Low Density ®High Density ❑Redevelop ❑General Permit ❑Universal SMP ❑Other 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): ❑CAMA Major ®Sedimentation/Eros ion Control ❑404/401 Permit ❑NPDESStormwater Ill. PROJLCI• INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Stormwater will be routed from impervious areas via curb and gutter to an underground Stormtech infiltration system Stormwater is stored within the infiltration system utilizing a control structure Stormtech utilizes a system of perforated molded plastic chambers and a stone foundation for infiltration. Stormwater overflows outfall to an existing NCDOT drainage sytem that drains to unamed tributary and eventually into the Elizabeth River. The Elizabeth River is classified as an SA/FIQW water body. 2. Stormwater runoff from this project drains to the Cave Fear River basin. 3. 'Total Property Area: 1.32 acres 4. Total Wetlands Area: 0 acres 5. 100' Wide Strip of Wetland Area: N/A awes (not applicable if no wetlands exist on site) 6. Total Project Area**:1.16 acres 7. Project I3uilt Upon Area:53.8 qo 8. I -low many drainage areas does the project have?] 9. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the information for each area provided in the same format as below. For hieh density proiects, complete the table with one drainage area for each engineered stormwater device. Basin Information Drainage Area 1 Drainage Area 2 Receiving Stream Name Unnamed Tributary to Elizabeth River Stream Class & Index No. SA / HQW; '18-88-9-2-(1) Total Drainage Area (sf) 57500 ( 1.3au On -site Drainage Area (so 57500 Off -site Drainage Area (so 0 Existing Impervious* Area (so 16,839 Proposed Impervious*Area (sf) 30,928 %, lmpervious* Area (total) 53.8 Impervious Surface Area Drainage Area 1 g Drainage Area 2 On -site Buildings (sf) 4835 On -site Streets (so 0 On -site Parking (sf) 24,602 Ou-site Sidewalks (so 1,491 Other on -site (so 0 Off -site (s1) 0 'rota) (so: 30,928 Form SWU-101 Version 03.27.09 Page 2 of Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sideroalks, gravel areas, etc. "Total project area shall be calculated based on the current policy regarding inclusion Of Wetlands in the built upon area percentage calculation. This is the area used to calculate percent project built upon area (BLIA). 10. How was the off -site impervious area listed above derived? IV. DEI?D RESTRICTIONS AND PROTECTIVE COVENANTS One of the following deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table listing each lot number, size and the allowable built -upon area for each lot must be provided as an attachment. Forms can be downloaded from htto'//h2o ear state nc.us/su/bap forms htm - deed restrictions. Form DRPC-I High Density Commercial Subdivisions Form DRPC-2 High Density Developments with Outparcels Form DRPC-3 High Density Residential Subdivisions Form DRPC-4 Low Density Commercial Subdivisions Form DRPC-5 Low Density Residential Subdivisions Form DRPC-6 Low Density Residential Subdivisions with Curb Outlets By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required in the above form, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable slate stornnvater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Slormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. Forms can be downloaded from lilt[,//li2o.enr.state.nC.us/su/bap forms.htm. Form SW401-1,ow Density Norm SW401-Curb Outlet System Norm SW401-Off-Site System Norm SW40"1-Wet Detention Basin Form SW401-Infiltration Basin Norm SW401-Infiltration Trench Form SW401-13ioretention Cell Norm SW40"t-Level Spreader Norm SW40"1-Wetland Form SW401-Grassed Swale Norm SW401-Sand Filter Form SW401-Permeable Pavement Low Density Supplement Curb Outlet System Supplement Off -Site System Supplement Wet Detention Basin Supplement Infiltration Basin Supplement Underground Infiltration "french Supplement Bioretention Cell Supplement Level Spreader/Filter Strip/Restored Riparian Buffer Supplement Constructed Wetland Supplement Grassed Swale Supplement Sand Filler Supplement Permeable Pavement Supplement Norm SWU-101 Version 03.27.08 Page 3 of • V1. SUBMI'17AL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Office. (Appropriate office may be found by locating project on the interactive online map at htto://112o.enr.state nc.us/su/msi maps.hurn) Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Originnl and ooe copy of the Stormwater Management Permit Application Form f • Original and one copy of the Deed Restrictions & Protective Covenants Form (if NIA required as per Part IV above) • Original of the applicable SupplementForm(s) and O&M agreement(s) for each BMP 16' • Permit application processing fee of $505 (Express: $4,000 for I -ID, $2,000 for LD) payable to NCDENR 4 • Calculations & detailed narrative description of stonnwater treatment/management AR • Copy of any applicable soils report AV • Two copies of plans and specifications (sealed, signed & dated), including: - Development/Project name - Engineer and firm - Legend - North arrow Scale Revision number & dale - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage casements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. (ex. designing engineer or firm) Designated agent (individual or firm):Kimley-Horn and Associates, Inc. - Peter A. Bishop, P.E. Mailing Address:3001 Westton Parkway Statc:NC Zip:27513 Phone: (919 ) 677-2000 Pax: (919 ) 677-2050 Email:Peter Bishoprr kimley-horn com VIIL APPLICANT'S CERTIFICATION I, (Print or type nnrme of person listed in General Information, itent 2) Thonms B. Morris 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 cov will be recorded, and that the proposed project complies with the requirements of "15A NCAC 2I-I .1000.A A c v Signature: Date: Form SWU-101 Version 03.27.08 Page 4 of i Nelson, Christine From: John. Kuzenski@kimley-horn.com Sent: Thursday, September 24, 2009 3:42 PM To: Christine.Nelson@ncmail.net Cc: DTrask@stormtech.com; Peter. Bishop@kimley-horn.com Subject: First Citizens Bank Oak Island - Stormwater project No. SW8080744 Attachments: Infiltration Trench revised-9-24-09.pdf; Master Summary-9-24-09.pdf; ST-Stage Storage-9-24-09.pdf; 37152_SWM BASE -POST Feb REV 1 092409 P1.pdf Ms. Nelson, Please find attached requested supporting information which demonstrates the previously approved Stormtech System will provide the required volume without the additional three (3) installed chambers. We have attached the revised infiltration trench supplement, Stormtech Stage Storage Worksheet, revised Pond Pack Flow summaries and revised post -development exhibit for your review. You will find that when considering the additional storage provided by the perimeter stone, the result is there will be approximately 500 cubic feet of additional storage beyond the minimum requirement. The pond pack results clearly show the provided volume will allow the runoff from the 1 year storm to fully infiltrate. It is also important to note the 10"/hour infiltration rate used in the calculations is very conservative as the geotechnical boring taken directly under the proposed system was 27.8"/hour. The 10"/hour was used at the direction of the on -site DWQ inspector who observed the soil borings. We would request the installed system which was previously approved under the original permit be considered adequate based on the supporting calculations. We would also request that the outstanding comments with regard to the additional three (3) chambers be retracted since we have demonstrated the previously approved system is adequate on its own to meet parking plan modification. Feel free to contact us with questions. Thanks. John Kuzenski, P.E. Kimley-Horn & Associates, Inc. 333 Fayetteville Street Suite 600 Raleigh, NC 27601 Main: 919-835-1494 Direct: 919-653-2990 Fax: 919-653-5847 From: Nelson, Christine[mailto:christine.nelson@ncdenr.gov] Sent: Wednesday, September 23, 2009 3:58 PM To: Dan Trask Subject: RE: First Citizens Bank Oak Island - Stormwater project No. SW8080744 Dan, If the original system can be shown to provide the required volume without the additional chambers, then the engineer needs to provide the supporting documentation along with any updated forms when he submits the additional information. Christine Christine Nelson Environmental Engineer NC D WQ - Stormwater Program Wilmington Regional Office 910-796-7323 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. From: Dan Trask [mailto:DTrask@stormtech.com] Sent: Tuesday, September 22, 2009 4:11 PM To: christine.nelson@ncmail.net Subject: First Citizens Bank Oak Island - Stormwater project No. SW8080744 Hello Christine, Just wanted to get you some additional information that I did not send you yet pertaining to the StormTech Detention System and permit for the above project. I understand that the original permit application had been approved using the 51 StormTech Chambers with appropriate manifold connections. The problem in permitting arose when the additional 3 chambers were added because those chambers were not attached to the manifold. John Kuzenski of Kimley-Horn had added those additional 3 chambers to add additional volume to the system because the impervious area had increased. I have just discussed with John that the addition of those 3 additional chambers is actually unnecessary because we have additional volume we can take credit for with the approved version of 51 chambers. The entire bed of the StormTech System uses a one foot perimeter stone for safety factor. If the additional stone void for the one foot perimeter is included with the volume of the originally approved system of 51 chambers, then this adjusted volume would put us over and above the required volume without having to take credit for the additional 3 chambers that were installed without being attached to the manifold. We could just disregard that those additional chambers are part of the system, because the required storage volume is already available in the original 51 chambers, and in the stone voids both above the chambers, below the chambers, in between the rows of chambers, and also in the one foot perimeter stone around the chamber bed. Please see the attached incremental storage sheet which illustrates that the required volume is contained in the original 51 chamber design, and it is not necessary to credit the additional 3 chamber with any storage volume. The volume available for storage in the 51 chamber layout including all available stone void is 4,525.30 Cubic Feet which exceeds the requirement for this project. Thank you very much and please let me know your thoughts on this information Sincerely, Dan Trask Regional Product Manager d tras k(cDsto rmtec h.c o m StormTech Phone: 888-275-5345 Fax: 888-457-9652 www.stormtech.com NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Coleen H. Sullins Governor Director September 1, 2009 Mr. Thomas B. Morris, Senior Vice President First Citizens Bank and Trust Company PO Box 27131 Raleigh, NC 27611 Subject: Request for Additional Information Stormwater Project No. SW8 080744 First Citizens Bank Brunswick County Dear Mr. Morris: Dee Freeman Secretary The Wilmington Regional Office received a modified State Stormwater Management Permit Application for the First Citizens Bank on February 19, 2009 with additional information received on April 28, 2009 and July 15, 2009. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: Since the installed system appears to have a unique operation and maintenance requirement, the current operation and maintenance agreement (0&M) needs to be updated to include those practices that are specific to the "isolator" row. The O&M must clearly describe and demonstrate how the system will be cleaned as well as how often the system will be cleaned. This O&M must also address, but not be limited to, the issues identified in the generic O&M signed in July 2008. The modified O&M must be signed and notarized. 2. Please be advised that because the installed system does not meet the requirements of the Division, quarterly monitoring of the system must be conducted on both influent and any excess runoff that is not infiltrated. A monitoring plan will need to be submitted to the Division for approval within 60 days from date the permit modification has been issued and must be based on the conditions that will be outlined in the permit. 3. Please be advised that the permit will also require the system to be repaired or replaced if it is determined that the system is not functioning properly. Please note that this request for additional information is in response to a preliminary review. The requested information should be received in this Office prior to October 2, 2009, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail, email or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. Wilmington Regional Office 127 Cardinal Drive Extension, Wilmington, North Carolina 28405 one Phone: 910-796-72151 FAX: 910-350-20041 Customer Service: 1-877-623-6748 North Carolina Internet:w .ncvvaterquality org Nn//� An Equal Opportunity l Affirmative Action Employer (/{� a'�atu!al Thomas B. Morris September 1, 2009 Stormwater Application No SW8 080744 The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. If you have any questions concerning this matter please feel free to call me at (910) 796-7215 or email me at christine.nelson@ncdenr.gov. Sincerely, Christine Nelson Environmental Engineer GDS/can: S:\WQS\STORMWATERWDDINFO\2009\080744.sep09 cc: Peter A Bishop, Kimley — Horn and Associates, Inc. Christine Nelson Wilmington Regional Office Page 2 of 2 Kimley-Horn ®® and Associates, Inc. July 14, 2009 Ms. Christine Nelson North Carolina Dept. of Environment and Natural Resources Division of Water Quality 127 Cardinal Drive Ext. Wilmington, NC 28405 Re: First Citizens Bank Stormwater Project No. SW8080744 Dear Ms. Nelson: r2ECFyV�r� 5 2009 BY: In response to your comments issued on 6/29/09, KHA has provided the following information. 1. A letter from Stormtech explaining maintenance guidelines of the system with manufacturer's product specifications. Based on the supporting information provided by Stormtech, the system was installed per manufacturer's specifications and does not require modification. If you need any additional information or have any questions or comments, feel free to contact me directly at 919-653-2990. Mr. Trask from Stormtech has also offered to meet with you in person to review the Stormtech product design and maintenance guidelines. Very truly yours, KIMLEY-HORN AND ASSOCIATES, INC. John D. Kuzenski, P.E. Enclosures: One (1) Stormtech Letter One (1) Isolator Row O&M Manual Cc: Tom Morris, FCB Dan Trask, Stormtech File 13 TEL 919 835 1494 FAX 919 653 5847 ■ Suite 600 333 Fayetteville Street Raleigh, North Carolina 27601 StormTech- EnNomxeasoub bswn»Je MMQQm ' Ms. Christine Nelson North Carolina Dept. of Environment and Natural Resources Division of Water Quality 127 Cardinal Drive Ext. Wilmington, NC 28405 Re: First Citizens Bank Stormwater Project No SW8080744 Dear Ms. Nelson: REC1F'TVF;" n n 15 2009 BY: I have been in contact with John Kuzenski of Kimley-Hom regarding the resolution of the matter concerning the installation of the StormTech Stornwater System for the above referenced project. It is my understanding after reviewing your letter dated June 29, 2009 that the three additional StormTech Chambers that were added to the system after the original design were installed without being connected to the inlet manifold. According to this letter it is required that a manifold connection be provided to this row of three chambers to provide maintenance and accessibility. I understand the concerns and requirements that the stomrwater system be accessible and maintained. StormTech strongly encourages project owners to provide access for maintenance for all sormwater systems. The StormTech Systems are equipped with a feature called the Isolator Row, which is designed to capture the overwhelming majority of the runoff (that which is most heavily laden with sediment), before the stornwater is allowed to enter any of the adjacent non -Isolator Rows. This is accomplished usually with a bypass structure / weir wall apparatus diverting these flows into the Isolator Row. Access to these Isolator Rows is required to perform a jet -vac procedure down the entire run to flush out any debris and sediment that comes to accumulate in these rows over the course of the year. These Isolator Rows are the only rows of chambers that are recommended to have this jet -vac procedure performed upon. The jet -vac equipment is not recommended to be placed in non -Isolator Rows due to potential scour damage this apparatus could cause to the stone backfill. It is therefore common practice to design these StormTech Systems to have rows of chambers that are not necessarily connected to inlet manifolds. The sormwater conveyance is provided to these non - connected rows through the perforations in the sides of the chambers, and through the voids in the stone backfill. Through monitoring of existing installed projects, and numerous water quality field test studies, it has been confirmed that these Isolator Rows do function as intended to capture the sediment coming into the system. I am attaching the StormTech Isolator Row Operation and Maintenance Manual, which illustrates how these Isolator Rows are assembled and cleaned. I hope this information is helpful. Please feel free to contact me if there are any additional questions or concerns. Thank you very much. Sincerely,, / Dan Trask Regional Product Manager StormTech (888)275-5345 'i OelentionRelenliaifleclurpe Subsurface Stormwater Management" Dan Trask Regional Product Manager Main Office 20 Beaver Road, Suite 104 3708 Monique Lane Wethersfield, CT 06109 Charlotte, INC 28210 888-892-2694 • Fax: 866-328-8401 888-275-5345 • Fax: 888-457-9652 www.stormtech.com dtrask@stormtech.com StormTech- STORMTECH ISOLATOR" ROW - STEP-BY-STEP MAINTENANCE PROCEDURES Step 1) Inspect Isolator Row for sediment A) Inspection ports (if present) i. Remove lid from floor box frame ii. Remove cap from inspection riser iii. Using a flashlight and stadia rod, measure depth of sediment iv. If sediment is at, or above, 3' (76 mm) depth proceed to Step 2. If not proceed to step 3. B) All Isolator Rows i. Remove cover from manhole at upstream end of Isolator Row ii. Using a flashlight, inspect down Isolator Row through outlet pipe 1. Mirrors on poles or cameras may be used to avoid a confined space entry 2. Follow OSHA regulations for confined space entry if entering manhole iii. If sediment is at or above the lower row of sidewall holes [approximately 3' (76 mm)] proceed to Step 2. If not proceed to Step 3. Step 2) Clean out Isolator Row using the JetVac process A) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45" (1140 mm) or more is preferable B) Apply multiple passes of JetVac until backflush water is clean C) Vacuum manhole surnp as required Step 3) Replace all caps, lids and covers Step 4) Inspect and clean catch basins and manholes upstream of the StormTech system following the procedures for Classic Manifold Inlet System Figure 19 StormTech Isolator Row (not to scale) Call StormTech at 860.529.8188 or 888.892.2694 or visit our website at www.stormteeh.com for technical and product information. 23 n Stormwater Analysis ]First Citizens Bank 8900 .East Oak Island Drive OakIsland, NC Prepared for: First Citizens Bank ©Kimley-Horn and Associates, Inc., 2008 July 9, 2008 ®Of7C1 Kimley-Horn 0�—y and Associates, Inc. Type.... Unit Hyd. (HYG output) Page 7.04 Name.... POST Tag: 1 Event: 1 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... Type ill 24hr Tag: 1 SCS UNIT HYDROGRAPH METHOD STORM EVENT: 1 year storm Duration min Rain Depth = 4.0600 in Rain Dir - K:\RAL_LDEV\00FCB\011737152\09_Desi.gn Calculations\PondPack\ Rain File -ID = - TypeIII 24hr Unit Hyd Type = Default Curvilinear HYG Dir - K:\RAL LDEV\OOFCB\011737152\09_Design Calculations\PondPack\ IIYG File - 10 - - PRE Tc = 5.00 min Drainage Area = 1.318 acres Runoff CN= 56 Calc.lncrement= .667 Out.Incr.- 1.00 min HYG Volume = 2064 cu.ft HYDROGRAPH ORDINATES (cfs) Time I Output Time increment a.1.00 min min I .-------I-------------------------------------------------------------- Time on left represents time for first value in each row. 711.00 1 .00 .00 .01 .01 .03 716.00 1 .05 .10 .15 .20 .26 721.00 1 .32 ,37 .43 .49 .54 726.00 1 .59 .63 .63 .59 .54 731.00 .50 .48 .47 .46 .44 736.00 .42 .42 .41 .41 .40 741.00 I .38 .36 .35 .34 .33 746.00 I .32 .29 .27 .25 .24 751.00 1 .23 .22 .21 .19 .18 756.00 1 .17 .17 .17 .16 .16 761.00 1 .16 :16 .15 .15 .15 766.00 1 .15 .15 .15 ,14 .14 771.00 1 .14 .14 .14 .13 .13 776.00 1 .13 .13 .13 .12 .12 781.00 I .12 .12 .12 .12 .12 786.00 .11 .11 .11 .11 .11 791.00 .11 .11 .11 .11 .11. 796.00 I .11 .11 .11 .11 .11 001.00 I .11 .11 .11 .11 .11 806.00 .11 .11 .10 .10 .10 U11.00 1 .10 .10 .10 .10 .10 816.00 I .10 .10 .10 .10 .10 821.00 .10 .10 .10 .10 .10 026.00 1 .10 .10 .10 .10 .09 631.00 1 .09 .09 .09 .09 .09 836.00 1 .09 .09 .09 .09 .09 041.00 .09 .09 .09 .09 .09 046.00 I .09 .09 .09 .09 .09 851.00 1 .08 .08 .08 .08 .08 056.00 1 .08 .08 .08 .08 .08 .SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 3:19 PM 7/23/2008 7 ZO 09 Type.... Runoff CN-Area Name.... PRE Page 6.02 Fi.le.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- SCS UNIT HYDROGRAPH METHOD STORM EVENT ClVear sto Duration - T440.00 min Rain Depth - 4.0600 in Rain Dir - K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\ Rain File -ID = - TypeIII 24hr Unit Hyd Type - Default Curvilinear HYG Dir - K:\RAL LDEV\00FCB\0ll737152\09_Design Calculations\PondPack\ HYG File - ID - - OST Tc = 5.00 min Drainage Area = 1.318 acres Runoff CN= 70 Calc.Increment= .667 min Out.Incr.= 1.00 min HYG Volume t 6554 cu.f.t HYDROGRAPH ORDINATES (cfs) Time I Output Time increment = 1.00 min min ______________________________________________________________ Time on left represents time for first value in each row. 629.00 .00 .00 .00 .00 .00 634.00 .00 .00 .00 .01 .01 639.00 .01 .01 .01 .01 .01 644.00 1 .01 .01 .01 .01 .01 649.00 1 .01 .02 .02 .02 .02 654.00 1 .02 .02 .02 .02 .02 659.00 1 .02 .02 .02 .03 .03 664.00 1 .03 .03 .03 .03 .03 669.00 1 .04 .04 .04 .04 .04 674.00 1 .04 .05 .05 .05 .05 679.00 .05 .06 .06 .06 .06 684.00 1 .07 .07 .07 .07 .08 689.00 1 .08 .08 .09 .09 .10 694.00 1 .11 .12 .13 .14 .15 699.00 1 .18 .20 .22 .24 .25 704.00 1 .27 .31 .34 .37 .39 709.00 1 .41 .44 .49 .53 .57 714.00 1 .60 .65 .76 .93 1.12 71.9.00 1 1.28 1.40 1.50 1.5B 1.66 724.00 I 1.72 1.79 1.84 1.86 1.79 729.00 I 1.61 1.43 1.29 1.21 1.16 734.00 I 1.11 1.05 1.00 .96 .94 739.00 I .92 .89 .84 .79 .75 744.00 I .73 .71 .68 .62 .57 749.00 1 .53 .50 .48 .46 .42 754.00 1 .39 .37 .35 .34 .34 759.00 1 .33 .32 .32 .31 .31 764.00 1 .31 .30 .29 .29 .29 769.00 1 .29 .28 .28 .27 .27 774.00 1 .26 .26 .26 .25 .25 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 3:19 PM 7/23/2008 First Citizens Bank 8900 Gast Oak Island Drive Oak Island, NC STORMWATFR ANALYSIS Prepared for: First Citizens Bank Prepared by: KIM LEY -HORN AND ASSOCIATES, INC. 3001 WESTON PARKWAY CARY, NORI'H CAROLINA 2750 July 9, 2008 KHA Project 4011737152 This document, together with the concepts and designs presented herein, as an instrument of service, is intended only for the specific purpose and client for which it was prepared. Reuse of and improper reliance on this document without written authorization and adaptation by Kimley-Horn and Associates, Inc. shall be without liability .to Kimley-I torn and Associates, Inc. . 'TABLE OF CONTENTS OVERVIEW APPENDIX A: SITE INFORMATION USGS QUADRANGLE MAP USDA SOIL SURVEY MAP FIMA MAI' APPENDIX 13: DRAINAGE MAPS PRI DEVELOPMENT' DRAINAGE AREA MAI' POST -DEVELOPMENT DRAINAGE AREA MAP APPENDIX C: PRE & POST DEVELOPMENT SUAIMARY PRE -DEVELOPMENT VS. POST -DEVELOPMENT PEAK DISCHARGES APPENDIX D: WATER QUANTITY UNDERGROUND STORAGE CALCULATIONS UNDERGROUND PIPE STORAGE ROUTING CALCULATIONS STORMTECH STAGE STORAGE WORKSHEET APPENDIX E: WATER QUALITY CALCULATIONS TOWN OF OAK ISLAND STORMWATER MANAGEMENT PLAN FOR COMMERCIAL DEVELOPMENT SUPPLEMENTAL FORM PRE -DEVELOPMENT POLLUTANT EXPORT CALCULATIONS POST -DEVELOPMENT POLLUTANT EXPORT CALCULATIONS STORMTECH WATER QUALITY CALCULATIONS APPENDIX F: STORM DRAINAGE SYSTEM DETAILS OUTLET CONTROL STRUCTURE STORMCAD PIPE PROFILES APPENDIX G: STORMTECH DETAILS STORMTECH DETAILS/SPECIFICATIONS APPENDIX li: INPUT DATA CN VALUE TABLE PRECIPITATION TABLES HYDROLOGIC SOIL GROUPS r, t APPENDIX A•' ` .If.. IV • 1r ' {r • • 1 ) Of I � w-, WSW �.,O ..... i.j 1 Qu -0-7 -TT, Y I— on AN M eN It am, A K jqO A.. 04 Q -o I I "'W Iss I Q. 44tw - "I IF_Q, -1 I Ve Q T 14, 11.1 A ya, —INK �131 7;,w 17, �Ptqh I 0.- ps UM VT,,, vQvv 1 1 -1 T Q 11, A I an on "to 1. 46 v 1 '01 QI rI It ? It II Li, wv My v,, I 7 IV It I: V t, f k4lt; 1" It. A, . ....... 7_� 7, SIM o' M., 204 R, 2 No A . .... . 3.0 Isolator Ro r Stf pr ail Stellf ��fntE n�.rncr° Proccrliu -17 Step 1) Inspect Isolator Row for sediment A) Inspection ports (if present) i. Remove lid from floor box frame ii. Remove cap from inspection riser iii. Using a flashlight and stadia rod, measure depth of sediment and record results on maintenance log. iv. If sediment is at, or above, 3 inch depth proceed to Step 2. If not proceed to step 3. B) All Isolator Rows i. Remove cover from manhole at upstream end of Isolator now Using a flashlight, inspect down Isolator Row through outlet pipe 1. Mirrors on poles or cameras may be used to avoid a confined space entry 2. Follow OSHA regulations for confined space entry if entering manhole If sediment is at or above the lower row of sidewall holes (approximately 3 inches) proceed to Step 2. If not proceed to Step 3. StormTech Isolator Row (not to scale) Step 2) Clean out Isolator Row using the JetVac process A) A fixed culvert cleaning nozzle with rear facing nozzle spread of 45 inches or more is preferable B) Apply multiple passes of JetVac until backflush water is clean C) Vacuum manhole sump as required Step 3) Replace all caps, lids and covers, record observations and actions Step 4) Inspect & clean catch basins and manholes upstream of the StormTech system Sample Maintenance Log 'W[JWLL•1J rim "Klno2S� t W W 1 3/15/01 6.3 ft. none New Inetallation. Fixed point le Cl frame at grade djm 9/24/01 6.2 0.1 ft. 5ome grit felt sm 6/20/03 5.8 0.5 ft, Mui feel, debris visible in manhole and in ry Isolator now, maintenance due 777/03 6.3 ft. 1 0 1 5y6tem jetted and vacuumed djm 6 StormTech® Detention • Retention • Recharge Subsurface Stormwater Management'" 20 Beaver Road, Suite 104 Wethersfield I Connecticut 106109 860.529.8188 1888.892.2694 tax 866.328.84011 www.stormtech.com StormTech products are covered by one or more of the following patents: U.S. Patents: 5,401,459; 5,511,903; 5,716,163; 5,588,778:5,839,844; Canadian Patents: 2,158,418 Other U.S. and Foreign Patents Pending Printed in U.S.A. © Copyright. All rights reserved StormTech U-C, 2004 S090104-1 2.0 IsolatorGIS°I;':', rl)(''. c#Clld M ailEatf'C1 •)n 6. e StormTdch- 2.1 INSPECTION The frequency of Inspection and Maintenance varies by location. A routine inspection schedule needs to be established for each individual location based upon site specific variables. The type of land use (i.e. industrial, commercial residential), anticipated pollutant load, per- cent imperviousness, climate, etc. all play a critical role in determining the actual frequency of inspection and maintenance practices. At a minimum, StormTech recommends annual inspec- tions. Initially, the Isolator Row should be inspected every 6 months for the first year of operation. For subsequent years, the inspection should be adjusted based upon previous observation of sediment deposition. The Isolator Row incorporates a combination of standard manhole(s) and strategically located inspection ports (as needed). The inspection ports allow for easy access to the system from the surface, eliminating the need to perform a confined space entry for inspection purposes. If upon visual inspection it is found that sediment has accumulated, a stadia rod should be Inserted to deter- mine the depth of sediment. When the average depth of sediment exceeds 3 inches throughout the length of the Isolator Row, clean -out should be performed. 2.2 MAINTENANCE The Isolator Row was designed to reduce the cost of periodic maintenance. By "isolating" sediments to just one row, costs are dramatically reduced by eliminating the need to clean out each row of the entire storage bed. If inspection indicates the potential need for main- tenance, access is provided via a manhole(s) located on the end(s) of the row for cleanout. If entry into the manhole is required, please follow local and OSHA rules for a confined space entries. StormTech Isolator Row (not to scale) CATCH BASIN OR INSPECTION PORT LOCATION PER ENS DRAWING Examples of culvert cleaning nozzles appropriate for Isolator Row maintenance. (These are not StormTech products.) Maintenance is accomplished with the JetVac process. The JetVac process utilizes a high pressure water noz- zle to propel itself down the Isolator Row while scouring and suspending sediments. As the nozzle is retrieved, the captured pollutants are flushed back into the man- hole for vacuuming. Most sewer and pipe maintenance companies have vacuum/JetVac combination vehicles. Selection of an appropriate JetVac nozzle will improve maintenance efficiency. Fixed nozzles designed for cul- verts or large diameter pipe cleaning are preferable. Rear facing jets with an effective spread of at least 45" are best. Most JetVac reels have 400 feet of hose allow- ing maintenance of an Isolator Row up to 50 chambers long. The JetVac process shall only be performed on StormTech Isolator Rows that have AASHTO class 1 woven geotextile (as specified by StormTech) over their angular base stone. COVER ENTIRE ROW WITH AASHTO M288� CLASS 2 NONWOVEN GEOTEXTILE SC-740- 8'(2.4 m) WIDE STRIP rSTORMTI SO310- 5')1.5 m) WIDE STRIP I ENDCAP SC-740-24"PIPE ` WOVEN GEOTEXTILE THAT MEETS AASHTO M288 CLASS SC-310-12"PIPE BETWEEN STONE BASE AND CHAMBERS SC-740-5H 5 m) WIDE STRIP SC-310-4' (1.2 m) WIDE STRIP Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information. 3 � \jT�j" i ► (ii w� � 1I' • h `r �• I Detention •Retention • Recharge Subsurface Stormwater Management" IsolatorTMHow OW Manual StormTech® Chamber System for Stormwater Management 1.0 'The I:��I�ator R���r 1.1 INTRODUCTION An important component of any Stormwater Pollution Prevention Plan is inspection and maintenance. The StormTech Isolator Row is a patent pending technique to inexpensively enhance Total Suspended Solids (TSS) removal and provide easy access for inspection and maintenance. Looking down the Isolator Row from the manhole opening, woven geotextile is shown between the chamber and stone base. 1.2 THE ISOLATOR" ROW The Isolator Row is a row of StormTech chambers, either SC-740 or SC-310 models, that Is surrounded with filter fabric and connected to a closely located manhole for easy access. The fabric -wrapped chambers provide for settling and filtration of sediment as storm water rises in the Isolator Row and ultimately passes through the filter fabric. The open bottom chambers and perforated side - walls allow storm water to flow both vertically and horizon- tally out of the chambers. Sediments are captured In the Isolator Row protecting the storage areas of the adja- cent stone and chambers from sediment accumulation. Two different fabrics are used for the Isolator Row. A woven geotextile fabric is placed between the stone and the Isolator Row chambers. The tough geotextile provides a media for storm water filtration and provides a durable surface for maintenance operations. It is also designed to prevent scour of the underlying stone and remain intact during high pressure jetting. A non -woven fabric is placed over the chambers to provide a filter media for flows passing through the perforations in the sidewall of the chamber. The Isolator Row is typically designed to capture the 'first flush" and offers the versatility to be sized on a vol- ume basis or flow rate basis. An upstream manhole not only provides access to the Isolator Row but typically includes a high flow weir such that storm water flowrates or volumes that exceed the capacity of the Isolator Row overtop the over flow weir and discharge through a manifold to the other chambers. The Isolator Row may also be part of a treatment train. By treating storm water prior to entry into the chamber system, the service life can be extended and pollutants such as hydrocarbons can be captured. Pre-treatment best management practices can be as simple as deep sump catch basins, oil -water separators or can be inno- vative storm water treatment devices. The design of the treatment train and selection of pretreatment devices by the design engineer is often driven by regulatory requirements. Whether pretreatment is used or not, the Isolator Row is recommended by StormTech as an effective means to minimize maintenance requirements and maintenance costs. Note: See the StormTech Design Manual for detailed information on designing inlets for a StormTech system, including the Isolator Row. StormTech Isolator Row with Overflow Spillway (not to scale) OPTIONAL PRE-TREATMENT STORMTECH ISOLATOR ROW MANHOLE WITH OVERFLOW WEIR ECCENTRIC HEADER OPTIONAL —C_ ACCESS \ / STORMTECH CHAMBERS 2 Call StormTech at 888.892.2694 or visit our website at www.stormtech.com for technical and product information, Soil Map —Brunswick County, North Carolina MAP LEGEND MAP INFORMATION Area of Interest (AOI) Very Stony Spot Original soil survey map sheets were prepared at publication scale. 0it Area of Interest (AOI) Wet Spot Viewing scale and printing scale, however, may vary from the original. Please rely on the bar scale on each map sheet for proper Soils A Other map measurements. Q Soil Map Units Spacial Line Features Source of Map: Natural Resources Conservation Service Special Point Features Gully Web Soil Survey URL: http://websoilsuNey.nrce.usda.gov v Blowout Coordinate System: UTM Zone 17N ® Borrow Pic Short Steep Slope This product is generated from the USDA-NRCS certified data as of ;.. Other the version date(s) listed below. X Clay Spot Political Features Soil Survey Area: Brunswick County, North Carolina ♦ Closed Depression Municipalities Survey Area Data: Version 12, Feb 27, 2008 X Gravel Pit p Cities Date(s) aerial images were photographed: 3/1/1999 Gravelly Spot Q Urban Areas The orthophoto or other base map on which the soil lines were ® Landfill water Features compiled and digitized probably differs from the background Oceans imagery displayed on these maps. As a result, some minor shifting A Lava Flow of map unit boundaries may be evident. J, Marsh Streams and Canals R Mine or Quarry Transportation ... Rails Oo Miscellaneous Water Roads p. Perennial Water �y Interstate Highways .� Rock Outcrop N US Routes } Saline Spot State Highways Sandy Spot N Loral Roads Severely Eroded Spot Other Roads C Sinkhole Slide or Slip p Sodic Spot a Spoil Area Q Stony Spot USDA Natural Resources Web Soil Survey 2.0 5/5/2008 21111111111 Conservation Service National Cooperative Soil Survey Page 2 of 3 Soil Map -Brunswick County, North Carolina - Map Unit Legend Brunswick County, North Carolina (NC019) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI KrB Kureb fine sand, 1 to 8 percent slopes 2.2 100.0% Totals for Area of Interest (AOI) 2.21 100.0 Natural Resources Web Soil Survey 2.0 5/5/2008 Conservation Service National Cooperative Soil Survey Page 3 of 3 LEGEND z�,,,. SPECIAL FLOOD HAZARD AREAS (SFHAs) SUBJECT TO INUNDATION BY THE 1 % ANNUAL CHANCE FLOOD The 1 % annual chance flood (100-year flood), also known as the base flood, is the flood that has a 1 % chance of being equaled or exceeded in any given year. The Special Flood Hazard Area is the area subject to flooding by the 1% annual chance flood. Areas of Special Flood Hazard include Zones A, AE, AH, AO, AR, A99, V, and VE. The Base Flood Elevation is the water -surface elevation of the 1% annual chance flood. ZONE A No Base Flood Elevations determined. ZONE AE Base Flood Elevations determined. ZONE AN Flood depths of 1 to 3 feet (usually areas of ponding); Base Flood Elevations determined. ZONE AO Flood depths of 1 to 3 feet (usually sheet flow on sloping terrain); average depths determined. For areas of alluvial fan flooding, velocities also determined. ZONE AR Special Flood Hazard Area formerly protected from the 1% annual chance flood by a flood control system that was subsequently decertified. Zone AR indicates that the former flood control system is being restored to provide protection from the 1% annual chance or greater flood. ZONE A99 Area to be protected from 1 % annual chance flood by a Federal flood protection system under construction; no Base Flood Elevations determined. ZONE VE Coastal flood zone with velocity hazard (wave action); Base Flood Elevations determined. FLOODWAY AREAS IN ZONE AE The floodway is the channel of a stream plus any adjacent floodplain areas that must be kept free of encroachment so that the 1% annual chance flood can be carried without substantial increases in flood heights. OTHER FLOOD AREAS ZONE X Areas of 0.2% annual chance flood; areas of 1% annual chance flood with average depths of less than 1 foot or with drainage areas less than 1 square mile; and areas protected by levees from 1 % annual chance flood. OTHER AREAS ZONE X Areas determined to be outside the 0.2% annual chance floodplain. ZONE D Areas in which flood hazards are undetermined, but possible. COASTAL BARRIER RESOURCES SYSTEM (CBRS) AREAS \\ \ OTHERWISE PROTECIED AREAS (OPAs) CBRS areas and OPAs are normally located within or adjacent to Special Flood Hazard Areas. 1% annual chance floodplain boundary Z& GRID NORTH SCALE 10 = 500' (1 : 6,000) 0 Soo 1000 FEET D PANEL 2088J FIRM FLOOD INSURANCE RATE MAP NORTH CAROLINA m ip PANEL 2085 (SEE LOUTOB DIAGflMn OR M4P INOF.% FOR FlPM ParEL uraun COMNNS WWJMry ao W. PMEt s FM nau rasxiL aFwcN. To OF a� Isaa.Tooa or ass , I I to CD rm. o roo— Tr ro .w� t •s ore..: n. e,<r" HE mm EFFECTIVE DATE MAP NUMBER TUNE 2, 2006 �33720200\208500J State of North Carolina Federal Emergency Management Agency tm ted u copy M a Op n m me amap does ncea Poop map. P ores amendments u I h may hme, . This map bsea not rto th changes or a tiock. or he at may have teen made subsequent to the rate on ant the tine hlxk. 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I I : , I � I I � r 1, . . I I I I I -" I ' I, �� N � � - I I I � I' � ' I . I I . . I, " - .!!! I ' 4 �% ".. . 11 � I"t"" -, .. - - I ; 'i � , - r, - ..' I4,_, I? � � %: I L ' 1, , II � "I . I , , ? �' " - � , � I , � I . I� I � '�. I, �';�' , I, I , 11,11 -',r, , .' " I I '. I - - - . � I � 11 , I I�-'as' I - � . �T;l rl -t, "ITI e ,I- - - I .1 � I - � - " ,", I. �11"'-. , - � I .. I . � , ,I, It It t_- V :1 ell it, tp, ZJr Itr 1,9 it. lit, Ilt IT 3L 41 ,x ITI It _IA --tIt If y k OA� le It Z77 41 rtt' IN, r Tl It A tt 1-tt 'La it, " ...... .... tii, .. ... It 6N, l4, It. tl j JI .1 ol t-9; It el It It- iit I' tit , I ', " '. ri, It wl �N I. ft, S ...... ? ltttfil ®IMKimley-Horn ® _ ._, and Associates, Inc. PEAK DISCHARGE ANALYSIS FOR 1 & 10 YEAR 24-HOUR STORM EVENTS Project Information Project Name: First Citizens Bank - 8900 E. Oak Island Dr., Oak Island, NC KHA Project #: 011737152 Designed by: JDK Date: 5/9/2007 Revised by: KMV Date: 7/9/2007 Checked by: Date: On -site Runoff Drainage Area Impervious Area Weighted CN (acres) (acres) Pre -Development 1.32 0.387 56 Post Development 1.32 0.684 70 Volumes Provided Routed Flows Water Surface Storage Storm Event (cfs)' Elevation Provided (cf) 1-year 0 14.64 1292 10-year 2.62 16.04 3080 1-Year Peak Discharge (cfs) 0.63 0.00' 10-Year Peak Discharge (cfs) 3.60 2.62" ' Post development peak discharges are shown after being routed through underground storage system a A-P NDIX p i t y i � { • �' It - :k WIT %y SO C A 't Ix. cc 71 _A_ MI. -,k v; my UPS, 9�� 3 qN, W,W psi, 1 "'.3 my Ah- Wol" Ail ­11"t y-P 'W71 jv, .1 , to '03 ti: I 4111.- 11q low Kv W7, vl� :AGIN, 14, "A V�W- "i SO A-0 jjl "In lh, IV, �7,' A NLZ y, al W A Q=q qm, NY m 1m, 05, 1 wig '1, 4 A, - 4,A' 1, §ONV PAZ I % 1, M - t _4 'i7 A owl - lop -S .4 illm Id tI av W W� WA., V to 41- Wa­ "Inc 1'.. lvt ... Ix� 0' N4 Job File: K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\STORMTECH DESIGN-7-3 Rain Dir: K:\RAL LDEV\OOFCB\011737152\09 Design Calculations\PondPack\ JOB TITLE Project Date: 7/7/2008 Project Engineer: John Kuzenski Project Title: FCB-Oak Island, NC Project Comments: Stormtech Design SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Job File: K:\RAL_LDEV\OOFCB\011737152\09 Design Calculations\PondPack\STORMTECH DESIGN-7-3 Rain Dir: K:\PAL—LDEV\OOFCB\011737152\09—Design Calculations\PondPack\ WARNING MSG WARNING......... WARNING MESSAGES ................... 1.01 MASTER SUMMARY ....*' Watershed....... Master Network Summary ............. 2.01 ****+********** NETWORK SUMMARIES (DETAILED) *************** Watershed....... 1 Executive Summary (Nodes) .......... 3.01 Watershed....... 10 Executive Summary (Nodes) .......... 3.02 +++a+++aaa+a++++++ DESIGN STORMS SUMMARY *+*xxx++xx++++++x+a Oak Island...... Design Storms ...................... 4.01 Oak Island...... 1 Design Storms ...................... 4.02 +++++a++++++++++++++++ TC CALCULATIONS POST............ It Calcs ........................... 5.01 PRE ............. Tc Calcs ........................... 5.03 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Table of Contents i ++++a++++++++++++++x++ CN CALCULATIONS +++++++++x+++++++++++ POST............ Runoff CN-Area ..................... 6.01 PRE ............. Runoff CN-Area ..................... 6.02 ++++++++++++++++++++x++ POND VOLUMES ***++++++++++++++++++a+ STORMTECH........ Vol: Elev-Volume ................... 7.01 ******************** OUTLET STRUCTURES *******++++++a+++++++ Outlet 1........ Outlet Input Data .................. 8.01 +x++++aa+++a++++++a+++x POND ROUTING *****+++x+a++++a++a++++ STORMTECH....... Pond Infiltration Calcs ............ 9.01 STORMTECH INF 1 Pond Infiltration HYG .............. 9.02 STORMTECH INF 10 Pond Infiltration HYG .............. 9.07 SIN: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) 4:03 PM Bentley Systems, Inc. 7/7/2008 Table of Contents ii WARNING: Kr (Reverse Flow Entrance Loss Coefficient) Kr was set to same value as Ke= .2 Check data for..... Type: Outlet Input Data Name: SIN: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) 4:03 PM was not specified. Outlet 1 Bentley Systems, Inc. 7/7/2008 Type.... WARNING MESSAGES Name.... WARNING Page 1.01 File.... K:\RAL-LDEV\OCFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3- MASTER DESIGN STORM SUMMARY Network Storm Collection: Oak Island Total Depth Rainfall Return Event in Type RNF ID ____________ ______ ---------------- ---------------- 1 4.0600 Synthetic Curve TypeIII 24hr 10 7.6400 Synthetic Curve TypeIII 24hr MASTER NETWORK SUMMARY SCS Unit Hydrograph Method (`Node=Outfall; +Node=Diversion;) (Trun= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left6Rt) Max Return HYG Vol Qpeak Qpeak Max WSEL Pond Storage Node ID Type Event cu.ft Trun min cfs It cu.ft ___-_ _______ POST __ AREA ------ 1 - __ 6554 727.00 ________ 1.86 POST AREA 10 19867 726.00 5.69 "POST OUT JCT 1 0 1.00 .00 'POST OUT JCT 10 4763 730.00 2.62 PRE AREA 1 2864 727.00 .63 PRE AREA 10 12653 727.00 3.60 "PRE OUT JCT 1 2864 727.00 .63 "PRE OUT JCT 10 12653 727.00 3.60 STORMTECH IN POND 1 6554 727.00 1.86 STORMTECH IN POND 10 19B87 726.00 5.69 STORMTECH OUT POND 1 0 630.00 .00 14.64 1292 STORMTECH OUT POND 10 4763 730.00 2.62 16.04 3080 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Master Network Summary Page 2.01 Name.... Watershed File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- C NETWORK SUMMARY -- NODES (Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left 6 Rt) DEFAULT Design Storm File,ID = Oak Island Storm Tag Name = 1 Data Type, File, ID = Synthetic _ Storm ___ - ------------ TypeIII 29hr Storm Frequency = 1 yr Total Rainfall Depth= 4.0600 in Duration Multiplier = 1 Resulting Duration = 1990.00 min Resulting Start Time= .00 min Step= 6.00 min End= 1990.00 min HYG Vol Qpeak Qpeak Max WSEL Node ID Type cu.ft Trun. min cfs ft POST AREA 6554 727.00 1.86 Outfall POST OUT JOT 0 1.00 .00 PRE AREA 2869 727.00 .63 Outfall PRE OUT JCT 2869 727.00 .63 STORMTECH IN POND 6559 727.00 1.86 STORMTECH OUT POND 0 630.00 .00 14.64 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Executive Summary (Nodes) Page 3.01 Name.... Watershed Event: 1 yr File.... K:\RAL_LDEV\00FCS\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 1 NETWORK SUMMARY -- NODES (Trun.= HYG Truncation: Blank=None; L=Left; R=Rt; LR=Left 6 Rt) DEFAULT Design Storm File,ID = Oak Island Storm Tag Name = 10 -------------------------------------------------------------------- Data Type, File, ID = Synthetic Storm TypeIII 24hr Storm Frequency = 10 yr Total Rainfall Depth= 7.6400 in Duration Multiplier = 1 Resulting Duration - 1440.00 min Resulting Start Time- .00 min Step= 6.00 min End= 1440.00, min HYG Vol Qpeak Qpeak Max WSEL Node ID Type cu.ft Trun. min cfs ft POST AREA 19887 726.00 5.69 Outfall POST OUT JCT 4763 730.00 2.62 PRE AREA 12653 727.00 3.60 Outfall PRE OUT JCT 12653 727.00 3.60 STORMTECH IN POND 19887 726.00 5.69 STORMTECH OUT POND 4763 730.00 2.62 16.04 SIN: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) 4:03 PM Bentley Systems, Inc. 7/7/2008 Type.... Executive Summary (Nodes) Page 3.02 Name.... Watershed Event: 10 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 29hr Tag: 10 Title... Project Date: 7/7/2008 Project Engineer: John Kuzenski Project Title: FCB-Oak Island, NC Project Comments: Stormtech Design DESIGN STORMS SUMMARY Design Storm File,ID = Oak Island Storm Tag Name = 1 ______________________________________________________________________ Data Type, File, ID = Synthetic Storm TypeIII 29hr Storm Frequency = 1 yr Total Rainfall Depth= 4.0600 in Duration Multiplier = 1 Resulting Duration = 1440.00 min Resulting Start Time= .00 min Step= 6.00 min End= 1440.00 min Storm Tag Name = 10 ______________________________________-----_____-_-__ Data Type, File, ID = Synthetic Storm TypeIII 29hr Storm Frequency = 10 yr Total Rainfall Depth= 7.6400 in Duration Multiplier = 1 Resulting Duration = 1990.00 min Resulting Start Time= .00 min Step= 6.00 min End= 1990.00 min SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Design Storms Name.... Oak Island Page 4.01 File.... K:\RAL-LDEV\OOFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3- DESIGN STORMS SUMMARY Design Storm File,ID = Oak Island Storm Tag Name = 1 Data Type, File, ID = Synthetic Storm TypeIII 24hr Storm Frequency = 1 yr Total Rainfall Depth= 4.0600 in Duration Multiplier = 1 Resulting Duration = 1440.00 min Resulting Start Time= .00 min Step= 6.00 min End- 1440.00 min Storm Tag Name = 10 --------------------------------------------------------------- Data Type, File, ID = Synthetic Storm TypeIII 24hr Storm Frequency = 10 yr Total Rainfall Depth= 7.6400 in Duration Multiplier = 1 Resulting Duration = 1440.00 min Resulting Start Time= .00 min Step= 6.00 min End= 1440.00 min SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2006 Type.... Design Storms Page 4.02 Name.... Oak Island Event: .1 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 1 TIME OF CONCENTRATION CALCULATOR ................................ ................................ ------------------------------- Segment 01: Tc: User Defined S/N: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) Segment R1 Time: 5.00 min ------------------------------- Total Tc: 5.00 min ------------------------- ------------------------- 4:03 PM Bentley Systems, Inc. 7/7/2008 Type.... Tc Calcs Name.... POST Page 5.01 File.... K:\RAL—LDEV\OOFCB\011737152\09—Design Calculations\PondPack\Stormtech Design-7-3- --------------------------------------- Tc Equations used... --------------------------------------- User Def.i.ned Tc = Value entered by user Where: Tc = Time of concentration SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Tc Calcs Page 5.02 Name.... POST File.... K:\PAL—LDEV\OOFCB\011737152\09—Design Calculations\PondPack\Stormtech Design-7-3- TIME OF CONCENTRATION CALCULATOR Segment #1: Tc: User Defined --------------------------------- Segment #1 Time: 5.00 min ------------------------------- Total Tc: 5.00 min SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2006 Type.... Tc Calcs Name.... PRE Page 5.03 File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Tc Equations used... ________________________________ ==== User Defined Tc = Value entered by user Where: Tc = Time of concentration SIN: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) 4:03 PM Bentley Systems, Inc. 7/7/2008 Type.... Tc Calcs Name.... PRE Page 5.04 File.... K:\PAL—LDEV\OOFCB\011737152\09—DesigR Calculations\PondPack\Stormtech Design-7-3- RUNOFF CURVE NUMBER DATA .......................................................................... .......................................................................... -------------------------------------------------------------------------- Impervious Area Adjustment Adjusted Soil/Surface Description CN acres %C 9UC CN Open space (Lawns,parks etc.) - Goo 39 .634 39.00 Impervious Areas - Paved parking to 98 .684 98.00 COMPOSITE AREA 6 WEIGHTED CN ---> 1.318 69.62 (70) ........................................................................... ........................................................................... SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Runoff CN-Area Name.... POST Page 6.01 File.... K:\PAL-LDEV\OOFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3- RUNOFF CURVE NUMBER DATA .......................................................................... .......................................................................... Impervious Area Adjustment Adjusted Soil/Surface Description CN acres 8C %UC CN -------------------------------- ------------- ----- ----- ------ Open space (Lawns,parks etc.) - Goo 39 .931 39.00 Impervious Areas - Paved parking to 98 .387 98.00 COMPOSITE AREA s WEIGHTED CN ---> 1.316 - 56.32 (56) ........................................................................... ........................................................................... SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Runoff CN-Area Name.... PRE Page 6.02 File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- USER DEFINED VOLUME RATING TABLE Elevation Volume (ft) (cu.ft) 13.50 0 ].A. 00 345 14.50 1087 15.00 1797 15.50 2458 16.00 3043 16.50 3475 17.00 3820 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Vol: Elev-Volume Name.... STORMTECH Page 7.01 File.... K:\RAL-LDEV\OOFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3- REQUESTED POND WS ELEVATIONS: Min. Elev.= 13.50 ft Increment = .10 ft Max. Elev.= 17.00 ft OUTLET CONNECTIVITY ---> Forward Flow Only (UpStream to DnStream) <--- Reverse Flow Only (DnStream to UpStream) < --- > Forward and Reverse Both Allowed Structure No. Outfall El, ft E2, -------- ft ----------------- Weir-Rectangular ---- WO ---> ------- Cl --------- 16.100 17.000 Inlet Box RO ---> Cl 17.000 17.000 Orifice -Area 00 ---> cl 14.700 17.000 Culvert -Circular Cl ---> TW 13.500 17.000 TW SETUP, US Channel SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Outlet Input Data Name.... Outlet 1 Page 8.01 File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\Pond Pack\Stormtech Design-7-3- OUTLET STRUCTURE INPUT DATA Structure ID = WO Structure Type = Weir -Rectangular ------------------------------------ # of Openings = 1 Crest Elev. = 16.7.0 ft Weir Length = 4.00 ft Weir Coeff. = 3.200000 Weir TW effects (Use adjustment equation) Structure ID = RO Structure Type = Inlet Box ------------------------------------ # of Openings = 1 Invert Elev. = 17.00 ft Orifice Area = 16.0000 sq.ft Orifice Coeff. _ .600 Weir Length = 16.00 ft Weir Coeff. = 3.200 K, Reverse = 1.000 Mannings n = .0000 Kev,Charged Riser = .000 Weir Submergence = No SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Outlet Input Data Name.... Outlet 1 Page 8.02 File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- OUTLET STRUCTURE INPUT DATA Structure ID Structure Type ----------------- II of Openings Invert Elev. Area Top of Orifice Datum Elev. Orifice Coeff. = 00 = Orifice -Area ------------------ = 1 = 14.70 ft .4700 sq.ft 15.00 ft 14.70 ft .600 SIN: DAYXYWJJ6MB3 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Outlet Input Data Name.... Outlet 1 Page 8.03 OUTLET STRUCTURE INPUT DATA Structure iD = Cl Structure Type = Culvert -Circular ------------------------------------ No Barrels = ]. Barrel Diameter = 1.2500 ft Upstream Invert = 13.50 ft Dnstream Invert = 12.30 ft Horiz. Length = 55.00.ft Barrel Length = 55.01 ft Barrel Slope _ .02182 ft/ft OUTLET CONTROL DATA... Mannings n = .0130 Ke = .2000 Kb = .023225 Kr = .2000 HW Convergence = .001 INLET CONTROL DATA... Equation form = 1 Inlet Control K = .0045 Inlet Control M = 2.0000 Inlet Control c = .03170 Inlet Control Y = .6900 T1 ratio (HW/D) _ .000 T2 ratio (HW/D) = 1.186 Slope Factor = -.500 Calc inlet only = Yes (forward entrance loss) (per ft of full flow) (reverse entrance loss) +/- ft Use unsubmerged inlet control Form 1 equ. below T1 elev. Use submerged inlet control Form 1 equ. above T2 elev. In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 a T2... At T1 Elev = 13.50 ft ---> Flow = 4.80 cfs At T2 Elev = 14.98 ft ---> Flow = 5.49 cfs Structure ID = TW Structure Type = TW SETUP, US Channel ------------------------------------ FREE OUTFALL CONDITIONS SPECIFIED CONVERGENCE TOLERANCES... Maximum Iterations= 40 Min. TW tolerance = .01 ft Max. TW tolerance = .01 ft Min. HW tolerance = .01 ft Max. HW tolerance = .01 ft Min. Q tolerance = .00 cfs Max. Q tolerance = .00 cfs SIN: DAYXYWJJ6M83 Bentley PondPack (10,00.023.00) 4:03 PM Bentley Systems, Inc. 7/7/2008 Type.... Outlet Input Data Name.... Outlet 1 Page 8.04 File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- INFILTRATION RATING TABLE CALCULATIONS Infilt.(cfs) _ (10.0000 (in/hr) * Area) k Ku Where: Ku = units conversion factor W.S.Elev Total Area Infilt. ft acres cf.s No storage at this elevation... infiltration set to zero. 13.50 .0000 .00 13. 60 .0019 .02 13.70 .0076 .08 13.80 .0171 .17 13.90 .0304 .31 14.00 .0475 .48 14.10 .0522 .53 14.20 .0570 .57 14.30 .0621 .63 14.40 .0674 .68 14.50 .0729 .73 14.60 .0771 .78 14.70 .0814 .B2 14.80 .0858 .87 14.90 .0903 .91 15.00 .0950 .96 15.10 .0999 1.01 15.20 .1050 1.06 15.30 .1102 1.11 15.40 .1155 1.16 15.50 .1209 1.22 15.60 .1245 1.26 15.70 .1281 1.29 15.80 .1317 1.33 15.90 .1354 1.36 16.00 .1391 1.40 16.10 .1447 1.46 16.20 .1505 1.52 16.30 .1564 1.58 16.40 .1624 1.64 16.50 .1685 1.70 16.60 .1723 1.74 16.70 .1762 1.78 16.BO .1802 1.82 16.90 .1842 1.86 17.00 .1882 1.90 S/N: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2006 Type.... Name.... File.... Pond Infiltration Calcs Page 9.01 STORMTECH K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- HYG file HYG ID - STORMTECH INF HYG Tag = 1 ----------------------------------- Peak Discharge = .80 cfs Time to Peak = 741.00 min HYG Volume = ----------------------------------- 6543 cu.ft HYDROGRAPH ORDINATES (cfs) Time Output Time increment = 1.00 min min Time on left represents time for first value in each row. ---------I------------------------------------------------------------- 629.00 1 .00 .00 .00 .00 .00 634.00 1 .00 .00 .00 .00 .00 639.00 1 .00 .00 .00 .00 .00 699.00 I .00 .00 .00 .00 .00 649.00 .00 .00 .00 .00 .00 654.00 I .00 .00 .00 .00 .00 659.00 1 .00 .00 .01 .01 .01 664.00 I .01 .01 .01 .01 .01 669.00 I .01 .01 .01 .01 .01 674.00 .01 .01 .01 .01 .01 679.00 I .01 .01 .02 .02 .02 684.00 .02 .02 .02 .02 .02 689.00 1 .03 .03 .03 .04 .04 694.00 I .04 .05 .05 .05 .06 699.00 I .06 .07 .08 .09 .10 704.00 .11 .13 .14 .16 .18 709.00 I .20 .23 .25 .28 .31 714.00 .35 .39 .43 .48 .49 719.00 .50 .52 .54 .56 .58 724.00 I .60 .62 .65 .68 .70 729.00 .72 .74 .75 .76 .77 734.00 I .77 .78 .78 .79 .79 739.00 .79 .79 .80 .80 .80 799.00 I .80 .79 .79 .79 .79 749.00 1 .78 .78 .77 .77 .76 754.00 1 .75 .75 .74 .73 .72 759.00 1 .72 .71 .70 .69 .68 764.00 i .67 .67 .66 .65 .64 769.00 .64 .63 .62 .61 .61 774.00 I .60 .59 .59 .58 .57 779.00 1 .57 .56 .55 .55 .54 S/N: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) 4:03 PM Bentley Systems, Inc. 7/7/2008 Type.... Pond Infiltration HYG Page 9.02 Name.... STORMTECH INF Tag: 1 Event: 1 yr File.... K:\RAL_LDEV\CDFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 1 HYDROGRAPH ORDINATES (cfs) Time Output Time increment = 1.00 min min Time on left represents time for first value in each row. --------- 784.00 I -------------------- .53 .53 ---------------------------------- .52 .52 .51 789.00 .51 .50 .50 .49 .48 794.00 1 .4B .44 .41 .38 .36 799.00 1 .31 .32 .30 .29 .28 804.00 1 .27 .27 .26 .25 .25 809.00 1 .24 .24 .23 .23 .22 814.00 .22 .22 .21 .21 .21 819.00 .21 .20 .20 .20 .20 824.00 1 .20 .19 .19 .19 .19 829.00 1 .19 .19 .18 .18 .18 834.00 1 .18 .18 .18 .18 .17 839.00 1 .17 .17 .17 .17 .17 844.00 1 .17 .17 .17 .17 .17 849.00 1 .16 .16 .16 .16 .16 854.00 1 .16 .16 .16 .16 .16 859.00 1 .16 .16 .16 .16 .15 864.00 1 .15 .15 .15 .15 .15 869.00 1 .15 .15 .15 .15 .15 874.00 1 .15 .15 .15 .15 .15 879.00 1 .15 .14 .14 .14 .14 884.00 1 .14 .14 .14 .14 .14 889.00 1 .14 .14 .14 .14 .14 894.00 1 .14 .14 .14 .13 .13 899.00 .13 .13 .13 .13 .13 904.00 .13 .13 .13 .13 .13 909.00 1 .13 .13 .13 .13 .13 914.00 1 .13 .12 .12 .12 .12 919.00 1 .12 .12 .12 .12 .12 924.00 1 .12 .12 .12 .12 .12 929.00 1 .12 .12 .12 .11 .11 934.00 1 .11 .11 .11 .11 .11 939.00 1 .11 .11 .11 .11 .11 944.00 1 .11 .11 .11 .11 .11 949.00 1 .10 .10 .10 .10 .10 954.00 1 .10 .10 .10 .10 .10 959.00 1 .10 .10 .10 .10 .10 964.00 1 .10 .09 .09 .09 .09 969.00 1 .09 .09 .09 .09 .09 974.00 1 .09 .09 .09 .09 .09 979.00 1 .09 .09 .09 .09 .09 984.00 1 .09 .09 .09 .09 .09 989.00 1 .09 .08 .08 .08 .08 994.00 1 .08 .08 .08 .08 .08 999.00 1 .08 .08 .08 .08 .08 1004.00 1 .08 .08 .08 .08 .09 SIN: DAYXYWJJ6MB3 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Pond Infiltration HYG Page 9.03 Name.... STORMTECH INF Tag: 1 Event: 1 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 1 HYDROGRAPH ORDINATES (cfs) Time Output Time increment = 1.00 min min I Time on left represents time for first value in each row. -------- 1009.00 I ---------------------------------------- 1 .08 .08 .08 ------------ .08 .08 1014.00 1 .08 .08 .08 .08 .08 1.019.00 1 .08 .08 .08 .08 .08 1.024.00 1 .08 .08 .08 .08 .08 1029.00 1 .07 .07 .07 .07 .07 1.034.00 1 .07 .07 .07 .07 .07 1039.00 1 .07 .07 .07 .07 .07 1044.00 1 .07 .07 .07 .07 .07 1049.00 1 .07 .07 .07 .07 .07 1054.00 1 .07 .07 .07 .07 .07 1059.00 1 .07 .07 .07 .07 .07 1064.00 1 .07 .07 .07 .07 .07 1069.00 1 .07 .06 .06 .06 .06 1074.00 1 .06 .06 .06 .06 .06 1079.00 1 .06 .06 .06 .06 .06 1084.00 .06 .06 .06 .06 .06 1089.00 .06 .06 .06 .06 .06 1094.00 .06 .06 .06 .06 .06 1099.00 1 .06 .06 .06 .06 .06 1104.00 1 .06 .06 .06 .06 .06 1109.00 1 .06 .06 .06 .06 .06 1114.00 1 .06 .06 .06 .06 .06 1119.00 1 .06 .06 .05 .05 .05 1124.00 1 .05 .05 .05 .05 .05 1129.00 1 .05 .05 .05 .05 .05 1134.00 1 .05 .05 .05 .05 .05 1139.00 1 .05 .05 .05 .05 .05 1144.00 1 .05 .05 .05 .05 .05 1149.00 1 .05 .05 .05 .05 .05 1154.00 1 .05 .05 .05 .05 .05 1159.00 1 .05 .05 .05 .05 .05 1164.00 1 .05 .05 .05 .05 .05 1169.00 1 .05 .05 .05 .05 .05 1174.00 1 .05 .05 .05 .05 .05 1179.00 1 .05 .05 .05 .05 .05 1184.00 1 .05 .05 .05 .05 .05 1189.00 1 .05 .05 .05 .05 .05 1194.00 .05 .05 .05 .05 .05 1199.00 .05 .05 .05 .05 .05 1204.00 .05 .05 .05 .05 .05 1209.00 .05 .05 .05 .05 .05 1214.00 .05 .05 .05 .05 .05 1219.00 1 .05 .05 .05 .05 .05 1224.00 1 .05 .05 .05 .05 .05 1229.00 1 .05 .05 .05 .05 .05 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Pond Infiltration HYG Page 9.04 Name.... STORMTECH INF Tag: 1 Event: 1 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 1 HYDROGRAPH ORDINATES (cfs) Time I Output Time increment = 1.00 min min I Time on left represents time for first value in each row. --------- 1234.00 I-------------------------------------------------------------- 1 .05 .05 .05 .05 .05 1239.00 1 .05 .05 .05 .05 .04 1244.00 .04 .04 .04 .04 .04 1249.00 .04 .04 .04 .04 .04 1254.00 1 .04 .04 .04 .04 .04 1259.00 1 .04 .04 .04 .04 .04 1264.00 .04 .04 .04 .04 .04 1269.00 .04 .04 .04 .04 .04 1274.00 1 .04 .04 .04 .04 .04 1279.00 1 .04 .04 .04 .04 .04 1284.00 1 .04 .04 .04 .04 .04 1289.00 1 .04 .04 .04 .04 .04 1294.00 1 .04 .04 .04 .04 .04 1299.00 1 .04 .04 .04 .04 .04 1304.00 1 .04 .04 .04 .04 .04 1309.00 1 .04 .04 .04 .04 .04 1314.00 1 .04 .04 .04 .04 .04 1319.00 1 .04 .04 .04 .04 .04 1324.00 1 .04 .04 .04 .04 .04 1329.00 1 .04 .04 .04 .04 .04 1334.00 1 .04 .04 .04 .04 .04 1339.00 1 .04 .04 .04 .04 .04 1344.00 1 .04 .04 .04 .04 .04 1349.00 1 .04 .04 .04 .04 .04 1354.00 1 .04 .04 .04 .04 .04 1359.00 1 .04 .04 .04 .04 .04 1364.00 1 .04 .04 .04 .04 .04 1369.00 1 .04 .04 .04 .04 .04 1374.00 1 .04 .04 .04 .04 .04 1379.00 1 .04 .04 .04 .04 .04 1384.00 1 .04 .04 .04 .04 .04 1389.00 1 .04 .04 .04 .04 .04 1394.00 I .04 .04 .04 .04 ..04 1399.00 1 .04 .03 .03 .03 .03 1404.00 1 .03 .03 .03 .03 .03 1409.00 1 .03 .03 .03 .03 .03 1414.00 1 .03 .03 .03 .03 .03 1419.00 1 .03 .03 .03 .03 .03 1424.00 1 .03 .03 .03 .03 .03 1429.00 1 .03 .03 .03 .03 .03 1434.00 1 .03 .03 .03 .03 .03 1439.00 1 .03 .03 .03 .03 .03 1444.00 1 .03 .03 .03 .03 .03 1449.00 1 .03 .02 .02 .02 .02 1454.00 1 .02 .02 .02 .02 .02 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Pond Infiltration HYG Page 9.05 Name.... STORMTECH INF Tag: 1 Event: 1 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 1 HYDROGRAPH ORDINATES (cfs) Time Output Time increment = 1.00 min min Time on left represents time for first value in each row. --------- 1459.00 I-------------------------------------------------------------- 1 .02 .02 .02 .02 .02 1464.00 ( .02 .02 .02 .02 .02 1469.00 I .02 .01 .01 .01 .01 1474.00 .01 .01 .01 .01 .01 1479.00 .01 .01 .01 .01 .01 1484.00 .01 .01 .01 .01 .01 1489.00 1 .01 .01 .01 .01 .01 1494.00 1 .01 .01 .01 .01 .01 1499.00 1 .01 .01 .01 .01 .01 1504.00 1 .01 .01 .01 .01 .01 1509.00 I .01 .01 .01 .01 .01 1514.00 I .01 .01 .01 .01 .01 1519.00 1 .01 .01 .01 .01 .01 1524.00 1 .01 .01 .01 .01 .01 1529.00 1 .01 .01 .01 .01 .01 1534.00 .01 .01 .00 .00 .00 1539.00 .00 .00 .00 .00 .00 1544.00 1 .00 .00 .00 .00 .00 1549.00 1 .00 .00 .00 .00 .00 1554.00 1 .00 .00 .00 .00 .00 1559.00 1 .00 .00 .00 .00 .00 1564.00 1 .00 .00 .00 SIN: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) 4:03 PM Bentley Systems, Inc. 7/7/2008 Type.... Pond Infiltration HYG Page 9.06 Name.... STORMTECH INF Tag: 1 Event: 1 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 1 HYG file HYG ID = STORMTECH INF HYG Tag = 10 ----------------------------------- Peak Discharge = 1.43 cfs Time to Peak = 730.00 min HYG Volume = ----------------------------------- 15113 cu.ft HYDROGRAPH ORDINATES (cfs) Time Output Time increment = 1.00 min min Time on left represents time for first value in each row. ---------I------------------------------------------------------------- 481.00 .00 .00 .00 .00 .00 486.00 1 .00 .00 .00 .00 .00 491.00 .00 .00 .00 .00 .00 496.00 .00 .00 .00 .00 .00 501.00 .00 .00 .00 .00 .00 506.00 1 .00 .00 .00 .00 .00 511- 00 1 .00 .00 .00 .00 .00 516.00 1 .00 .00 .00 .01 .01 521.00 1 .01 .01 .01 .01 .01 526.00 1 .01 .01 .01 .01 .01 531.00 1 .01 .01 .01 .01 .01 536.00 1 .01 .01 .01 .01 .01 541.00 1 .01 .01 .01 .01 .01 546.00 1 .02 .02 .02 .02 .02 551.00 1 .02 .02 .02 .02 .02 556.00 1 .02 .02 .03 .03 .03 561.00 1 .03 .03 .03 .03 .04 566.00 1 .04 .04 .04 .04 .04 571.00 1 .04 .05 .05 .05 .05 576.00 1 .05 .05 .05 .05 .06 581.00 I .06 .06 .06 .06 .06 586.00 .06 .06 .07 .07 .07 591.00 1 .07 .07 .07 .07 .07 596.00 1 .08 .08 .08 .08 .08 601.00 1 .09 .09 .09 .09 .09 606.00 I .09 .10 .10 .10 .10 611.00 I .10 .11 .11 .11 .11 616.00 1 .11 .12 .12 .12 .12 621.00 1 .12 .13 .13 .13 .13 626.00 1 .13 .14 .14 .14 .14 631.00 1 .14 .15 .15 .15 .15 SIN: DAYXYWJJ6MB3 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Pond Infiltration HYG Page 9.07 Name.... STORMTECH INF Tag: 10 Event: 10 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\Pond Pack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 10 HYDROGRAPH ORDINATES (cfs) Time Output Time increment = 1.00 min min Time on left represents time for first value in each row. ---------I-------------------------------------------------------------- 636.00 .16 .16 .16 .16 .17 641.00 .17 .17 .17 .1.8 .18 646.00 .18 .19 .19 .19 .20 651.00 .20 .20 .20 .21 .21 656.00 1 .21 .22 .22 .22 .23 661.00 .23 .23 .24 .24 .24 666.00 .25 .25 .25 .26 .26 671.00 .27 .26 .28 .29 .29 676.00 .30 .31 .32 .33 .33 681.00 1 .34 .35 .36 .37 .38 686.00 .39 .40 .41 .41 .42 691.00 .43 .45 .46 .46 .48 696.00 1 .49 .49 .50 .50 .51 701.00 .52 .53 .55 .56 .57 706.00 .59 .61. .63 .66 .68 711.00 .71 .74 .76 .79 .82 716.00 .85 .89 .92 .97 1.02 721.00 1.08 1.13 1.19 1.24 1.27 726.00 1 1.31 1.35 1.38 1.41 1.43 731.00 1.43 1.41. 1.40 1.38 1.37 736.00 1.35 1.33 1.31 1.29 1.26 741.00 1.26 1.24 1.21 1.19 1.16 746.00 1.13 1.10 1.08 1.05 1.02 751.00 1 1.00 .97 .95 .93 .92 756.00 1 .90 .89 .88 .87 .86 761.00 1 .85 .85 .84 .84 .84 766.00 1 .83 .83 .83 .83 .82 771.00 1 .62 .82 .82 .82 .81 776.00 1 .Bl .81 .81 .80 .80 781.00 1 .80 .79 .79 .79 .78 786.00 1 .78 .77 .77 .77 .76 791.00 .76 .76 .75 .75 .75 796.00 .74 .74 .74 .73 .73 801.00 .72 .72 .71 .71 .71 806.00 .70 .70 .69 .69 .68 811.00 1 .68 .66 .67 .67 .67 816.00 1 .66 .66 .65 .65 .65 821. 00 1 .64 .64 .64 .63 .63 826.00 .62 .62 .62 .61 .61 831.00 .61 .60 .60 .60 .39 836.00 1 .59 .59 .58 .58 .58 841.00 1 .57 .57 .57 .56 .56 846.00 1 .56 .55 .55 .55 .54 851.00 1 .54 .54 .54 .53 .53 856.00 1 .53 .52 .52 .52 .52 S/N: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Pond Infiltration HYG Page 9.08 Name.... STORMTECH INF Tag: 10 Event: 10 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 10 HYDROGRAPH ORDINATES (cfs) Time I Output Time increment = 1.00 min min Time on left represents time for first value in each row. ---------I---------------------------------------------------------- 861.00 1 .51. .51 .51 .51 .50 866.00 .50 .50 .50 .49 .49 871.00 .49 .49 .48 .48 .47 876.00 1 .45 .44 .43 .42 .41 881.00 1 .40 .39 .38 .38 .37 886.00 1 .37 .36 .36 .36 .35 691.00 1 .35 .35 .34 .34 .34 896.00 1 .34 .33 .33 .33 .33 901.00 1 .33 .33 .32 .32 .32 906.00 1 .32 .32 .31 .31 .31 911.00 1 .31 .31 .31 .31 .30 916.00 1 .30 .30 .30 .30 .30 921.00 1 .30 .29 .29 .29 .29 926.00 1 .29 .29 .29 .28 .28 931.00 1 .28 .28 .28 .28 .28 936.00 1 .27 .27 .27 .27 .27 941.00 1 .27 .26 .26 .26 .26 946.00 1 .26 .26 .26 .25 .25 951.00 1 .25 .25 .25 .25 .24 956.00 1 .24 .24 .24 .24 .24 961.00 1 .24 .23 .23 .23 .23 966.00 1 .23 .23 .23 .22 .22 971.00 .22 .22 .22 .22 .22 976.00 .22 .22 .22 .21 .21 981.00 1 .21 .21 .21 .21 .21 986.00 1 .21 .21 .21 .21 .21 991.00 1 .21 .20 .20 .20 .20 996.00 1 .20 .20 .20 .20 .20 1001.00 1 .20 .20 .20 .20 .20 1006.00 .20 .19 .19 .19 .19 1011.00 .19 .19 .19 .19 .19 1016.00 .19 .19 .19 .19 .19 1021.00 .18 .18 .18 .18 .18 1026.00 1 .18 .18 .18 .18 .18 1031.00 1 .18 .18 .18 .18 .18 1036.00 1 .17 .17 .17 .17 .17 1041.00 1 .17 .17 .17 .17 .17 1046.00 1 .17 .17 .17 .17 .17 1051.00 1 .17 .17 .16 .16 .16 1056.00 1 .16 .16 .16 .16 .16 1061.00 1 .16 .16 .16 .16 .16 1066.00 1 .16 .16 .15 .15 .15 1071.00 .15 .15 .15 .15 .15 1076.00 .15 .15 .15 .15 .15 1081.00 1 .15 .15 .14 .14 .14 SIN: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) 4:03 PM Bentley Systems, Inc. 7/7/2008 Type.... Pond Infiltration HYG Name.... STORMTECH INF Tag: 10 Page 9.09 Event: 10 yr File.... K:\RAL-LDEV\OOFCB\011737152\09-Desi.gn Calculations \Pond Pack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 10 HYDROGRAPH ORDINATES (cfs) Time I Output Time increment = 1.00 min min Time on left represents time for first value in each row. ---------I------------------- 1086.00 1 .14 ----------------------------------------- .14 .14 .14 .14 1091.00 1 .14 .14 .14 .14 .14 1096.00 1 .14 .14 .14 .14 .14 1101.00 1 .14 .14 .14 .13 .13 1106.00 1 .13 .13 .13 .13 .13 ..11,11.00 1 .13 .13 .13 .13 .13 1116.00 .13 .13 .13 .13 .13 1121.00 .13 .13 .13 .13 .13 1126.00 1 .13 .13 .13 .13 .13 1131.00 i .13 .13 .13 .13 .13 1136.00 1 .13 .13 .13 .13 .13 11.41.00 1 .13 .13 .13 .13 .13 1146.00 1 .13 .13 .12 .12 .12 1151.00 .12 .12 .12 .12 .12 1156.00 .12 .12 .12 .12 .12 1161.00 .12 .12 .12 .12 .12 1166.00 1 .12 .12 .12 .12 .12 1171.00 .12 .12 .12 .12 .12 1176.00 .12 .12 .12 .12 .12 1181.00 .12 .12 .12 .12 .12 1186.00 .12 .12 .12 .12 .12 1191.00 .12 .12 .12 .12 .12 1196.00 .12 .11 .11 .11 .11 1201.00 .11 .11 .11 .11 .11 1206.00 .11 .11 .11 .11 .11 1211.00 1 .11 .11 .11 .11 .11 1216.00 1 .11 .11 .11 .11 .11 1221.00 1 .11 .11 .11 .11 .11 1226.00 1 .11 .11 .11 .11 .11 1231.00 1 .11 .11 .11 .11 .11 1236.00 1 .11 .11 .11 .11 .11 1241.00 .11 .11 .11 .11 .11 1246.00 .11 .11 .11 .11 .11 1251.00 .11 .11 .11 .11 .10 1256.00 .10 .10 .10 .10 .10 1261.00 .10 .10 .10 .10 .10 1266.00 .10 .10 .10 .10 .10 1271.00 .10 .10 .10 .10 .10 1276.00 .10 .10 .10 .10 .10 1291.00 .10 .10 .10 .10 .10 1286.00 I .10 .10 .10 .10 .10 1291.00 .10 .10 .10 .10 .10 1296.00 I .10 .10 .10 .10 .10 1301.00 I .10 .10 .10 .10 .10 1306.00 .10 .10 .10 .10 .10 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Pond Infiltration HYG Page 9.10 Name.... STORMTECH INF Tag: 10 Event: 10 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\Pond Pack\Stormtech Design-7-3- Storm... TypeIII 24hr Tag: 10 HYDROGRAPH ORDINATES (cfs) Time I Output Time increment = 1.00 min min I Time on left represents time for first value in each row. --------- 1311.00 I______________________________________________________________ 1 .10 .10 .10 .10 .10 1316.00 1 .10 .10 .10 .1.0 .09 1321.00 1 .09 .09 .09 .09 .09 1326.00 1 .09 .09 .09 .09 .09 1331.00 .09 .09 .09 .09 .09 1336.00 .09 .09 .09 .09 .09 1341.00 .09 .09 .09 .09 .09 1346.00 1 .09 .09 .09 .09 .09 1351.00 1 .09 .09 .09 .09 .09 1356.00 1 .09 .09 .09 .09 .09 1361.00 .09 .09 .09 .09 .09 1366.00 .09 .09 .09 .09 .09 1371.00 1 .09 .09 .09 .09 .09 1376.00 1 .09 .09 .09 .09 .09 1381.00 1 .09 .09 .08 .08 .08 1386.00 1 .08 .08 .08 .08 .08 1391- 00 1 .08 .08 .08 .08 .08 1396.00 1 .08 .08 .08 .08 .08 1401..00 .08 .08 .08 .08 .08 1406.00 .08 .08 .08 .08 .08 1411.00 .08 .08 .08 .08 .08 1416.00 .08 .08 .08 .08 .08 1421.00 1 .08 .08 .08 .08 .08 1426.00 1 .08 .08 .08 .08 .08 1431.00 1 .08 .08 .08 .08 .08 1436.00 1 .08 .06 .08 .08 .08 1441.00 1 .08 .08 .07 .07 .07 1446.00 .07 .06 .06 .06 .06 1451.00 .05 .05 .05 .05 .04 1456.00 1 .04 .04 .04 .04 .03 1461.00 .03 .03 .03 .03 .03 1466.00 .03 .02 .02 .02 .02 1471.00 .02 .02 .02 .02 .02 1476.00 1 .02 .02 .02 .02 .02 1481.00 1 .02 .02 .02 .02 .02 1486.00 1 .02 .01 .01 .01 .01 1491.00 1 .01 .01 .01 .01 .01 1496.00 1 .01 .01 .01 .01 .01 1501.00 1 .01 .01 .01 .01 .01 1506.00 1 .01 .01 .01 .01 .01 1511.00 1 .01 .01 .01 .01 .01 1516.00 1 .01 .01 .01 .01 .01 1521.00 1 .01 .01 .01 .01 .01 1526.00 .01 .01 .01 .01 .01 1531.00 I .01 .01 .01 .01 .01 S/N: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Pond Infiltration HYG Page 9.11 Name.... STORMTECH INF Tag: 10 Event: 10 yr File.... K:\PAL-LDEV\OOFCB\011737152\09-Design Calculations\PondPack\Stormtech Design-7-3- HYDROGRAPH ORDINATES (cfs) Time I Output Time increment = 1.00 min min I Time on left represents time for first value in each row. -------- 1536.00 I------------------------------------------------------------- 1 .01 .01 .01 .01 .01 1541.00 1 .01 _01 .01 .01 .01 1546.00 1 .01 .01 .0"L .01 .01 1551.00 1 .01 .01 .00 .00 .00 1556.00 1 .00 .00 .00 .00 .00 1561.00 1 .00 .00 .00 .00 .00 1566.00 1 .00 .00 .00 .00 .00 1571.00 1 .00 .00 .00 .00 .00 1576.00 1 .00 .00 .00 .00 .00 1581.00 1 .00 .00 .00 SIN: DAYXYWJJ6M83 Bentley Systems, Inc. Bentley PondPack (10.00.023.00) 4:03 PM 7/7/2008 Type.... Pond Infiltration HYG Page 9.12 Name.... STORMTECH INF Tag: 10 Event: 10 yr File.... K:\RAL_LDEV\OOFCB\011737152\09_Design Calculations\PondPack\Stormtech Design-7-3- ---- 0 ----- Oak Island... 4.01, 4.02 Outlet 1... 8.01 P ----- POST ... 5.01, 6.01 PRE... 5.03, 6.02 ----- S ----- STORMTECH... 7.01, 9.01 STORMTECH INF 1... 9.02, 9.07 ----- W ----- WARNING... 1.01 Watershed... 2.01, 3.01, 3.02 S/N: DAYXYWJJ6M83 Bentley PondPack (10.00.023.00) 4:03 PM Bentley Systems, Inc. 7/7/2008 Number of chambers - 51 Voids in the stone (porosity) - 0.40 Base of Stone Elevation - .13.50, StormTech SC 740 Incremental Storage Volumes StormTech- oater Management' ent Subsurface Stormwater Management` Height of System (in) Incremental Chamber (fta) Incremental Stone (fta) Incremental Ch & St (ft3) Cumulative Chamber (fta) Cumulative System (ft) Elevation 42 0 1.13 1.13 74.90 3820 17.00 41 0 1.13 1.13 73.77 3762 16.92 40 0 1.13 1.13 72.64 3705 16.83 39 0 1.13 1.13 71.52 3647 16.75 38 0 1.13 1.13 70.39 3590 16.67 37 0 1.13 1.13 69.26 3532 16.58 36 0.05 1.10 1.16 68.14 3475 16.50 35 0.16 1.06 1.22 66.98 3416 16.42 34 0.28 1.01 1.30 65.75 3353 16.33 33 0.60 0.89 1.49 64.46 3287 16.25 32 0.80 0.81 1.61 62.97 3211 16.17 31 0.95 0.75 1.70 61.36 3129 16.08 30 1.07 0.70 1.77 59.66 3043 16.00 29 1.18 0.65 1.84 57.89 2952 15.92 28 1.27 0.62 1.89 56.05 2859 15.83 27 1.36 0.58 1.94 54.17 2763 15.75 26 1.45 0.55 2.00 52.23 2664 15.67 25 1.52 0.52 2.04 50.23 2562 15.58 24 1.58 0.49 2.08 48.19 2458 15.50 23 1.64 0.47 2.11 46.11 2352 15.42 22 1.70 0.45 2.15 44.00 2244 15.33 21 1.75 0.43 2.18 41.85 2134 15.25 20 1.80 0.41 2.21 39.67 2023 15.17 19 1.85 0.38 2.24 37.47 1911 15.08 18 1.89 0.37 2.26 35.23 1797 15.00 17 1.93 0.35 2.29 32.96 1681 14.92 16 1.97 0.34 2.31 30.6E 1564 14.83 15 2.01 0.32 2.33 28.36 1447 14.75 14 2.04 0.31 2.35 26.03 1328 14.67 13 2.07 0.30 2.37 23.68 1208 14.58 12 2.10 0.28 2.39 21.31 1087 14.50 11 2.13 0.27 2.41 18.92 965 14.42 10 2.15 0.27 2.42 16.51 842 14.33 9 2.18 0.26 2.43 14.09 719 14.25 8 2.20 0.25 2.45 11.66 595 14.17 7 2.21 0.24 2.45 9.21 470 14.08 6 0 1.13 1.13 6.76 345 14.00 5 0 1.13 1.13 5.63 287 13.92 4 0 1.13 1.13 4.51 230 13.83 3 0 1.13 1.13 3.38 172 13.75 2 0 1.13 1.13 2.25 115 13.67 1 0 1.13 1 1.13 1 1.13 57 13.58 Total Chamber Storage = 45.9 ft' Corporate Office 20 Beaver Road Wethersfield, CT 06109 (888)-892-2694 Fax (866) 328-8401 { [ • 4' l ` APPENDIX E • R Y' + Ilk, pt '', A.5 v r rr • iti tr i t .+r 'w !'Cr ;rr ai • t k '.3 s t.. r S� t rk c A' L-ty. 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G ty. ` fd�5_ y r rtt.+xy7+•�Aµ a ar `a a z - � �}x„�y,. n� 1a25 �Cr � r i �ii x ��: JZ k�aky�c jtr. �-i• }� °g:, 7 .a•.� -.1 .5 •awn M •x° Yr � 5 ♦ �r s n . t a. s. { t c n iT a , Lt j ~Y it s f " r t . Y !i'., s L "4t :. iz< y t{a S�J r S t ;r. +' r h A• r` 'i°y.q A q 'C t, ry'. w. � ., •r. b �r'n w . "� t �+ t N' ^, v 1 i^t`:- t a .z t i s 4 14'Jt'sS" t r •eS ti"'A. ',' to n -' S �5. P t c k a.r- a� • v h r � R w r k .`T• ai -_.1 t� `T t{ e.. •£ ✓•t,y :•t A.,,. k2' �. }. K •. Town of Oak Island Stormwater Management Plan for Commercial Development Supplemental Form Name of Owner (Applicant): jiytS,Y Ckl'I-LENS 1 NOK Name of Contact Person: M i r dq C t_ p g21<C to Telephone: (A&I 1- 4 03 p Name of Development: _rj9,5 cgT -Lco5 T5 "r —, LOCalion/ParcelID: 8gw3 cps-T oqk tSW,-1D vk%vE Refer to Code of Ordinances, Town of Oak Island, North Carolina, Chapter 18, Article V for required contents of stormwater management plans for commercial development.. Refer to the Brunswick County Stormwater Management Manual (http://www.brunswickcountync.gov/Portals/O/bcfiles/Storm_ Water _Manual.pdo for guidance and specifications for preparing a stormwater management plan. For design and engineering specifications not currently addressed in the Brunswick County Manual, refer to the State BMP Manual (http://h2o.enr.state.nc.us/su/bmp_manual.htm). • The first 1.5 inches of runoff from impervious surfaces shall be retained on the site of the development. Describe stormwater system to meet this requirement. Volume of 1.5 inches runoff: 3'1 41 CF STo7-MTgGy DES1(�tJ = 38zo cF Calculate Pre- and Post -Development Peak Runoff for Design Storms Pre -development peak runoff O. b 3 cfs (1-year, 24-hour storm) Post -development peak runoff_ 0.00 _ cfs (I -year, 24-hour storm) If post -development peak flow exceeds predevelopment peak flow, describe proposed flow control BMP. Pre -development peak runoff 3 . tov _ cfs (10-year, 24-hour storm) Post -development peak runoff_ 2.62 _ cfs (10-year, 24-hour storm) If post -development peak flow exceeds predevelopment peak flow, describe proposed flow control BMP. Brunswick County, North Carolina Pollutant Export Calculations Pre -Development Conditions Form (5w-004) Step 1: Determine appropriate codes for each type of lend use and management from Table 6.1 and enter in Column 1. Step 2: Determine the area for each type of land use and management and enter in Column 2. Step 3: Enter the pollutant export coefficients from Table 6.1 for each land use type in columns 3, 5, 7, and 9. Step 4. Multiply each area in Column 2 by the export coefficients and enter in columns 4, 6, 8, and 10. Step 5. Sum columns 4, 6, 8, and 10. II currently a residential development enter average lot size: TP Ex - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Brunswick County, North Carolina Pollutant Export Calculations Post -Development Condltlons Form (SW-005) Step 1: Determine appropriate codes for each type of land use and management from Table 6.1 and enter In Column 1. Step 2: Determine the area for each type of land use and management and enter in Column 2. Step 3: Enter the pollutant export coefficients from Table 6.1 for each land use type in columns 3, 5, 7, and 9. Step 4. Multiply each area in Column 2 by the export coefficients and enter in columns 4, 6, 8, and 10. Step 5. Sum columns 4, 6, 8, and 10, - i1 residential develooment enter average lot size: -71 tc� a[w OW= . • �ai�� ���-a� ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- &MP ExPp�T ROIAUIOQ FAcToR5 LITILI2ED PER TABS[ 8,a.b (TN-aolb, l`-50%, i55-8070, CDLIFORM-`{Dgo) P11111111M Kimley-Horn and Associates, Inc. Project Information Stormtech Water Quality Calculations Project Name: First Citizens Bank KHA Project #: 011737152 Designed by: JDK Date: 5/92008 Revised by: MCP Date: 7/3/2008 Checked by: PAB Date: 5/912008 Design Resource: NCDENR - Slormwater Best Management Practices (April 1999) NCDENR - Updated Draft Manual of Slormwater Best Management Practices ( July 2005) Site Information Sub Area Location: Site Drainage Area (DA) = 1.32 Acres Impervious Area (IA) = 0.69 Acres Percent Impervious (1) = 52.3 % Required Storage Volume (Water Quality): Design Storm = 1.5 inch Determine Rv Value = 0.05 +.009 (1) = 0.52 inAn Storage Volume Required = 3,741 cf Summary of Proposed BMP Base of Stone Elevation = 13.50 it Base of Chamber Elevation = 14.00 it Top of Chamber Elevation = 16.50 it Top of Stone Elevation = 17.00 Volume of Individual Chamber = 74.90 —it cf Number of Chambers = 51 cf Provided Water Quality Volume 3,820 cf (Required Volume = 3741 ) C = " ICwiry Na raGAssmialea.lm Proposed RETENTION Volumes Water Quality Volume Water Quality Volume for 1.5' Rainfall required = 3,741 Incremental Accumulated Elevation Volume Volume, S Stage, Z cu It cu ft ft 13.50 0 0 0.00 14.00 345 345 0.50 14.50 742 1,087 1.00 15.00 710 1,797 1.50 15.50 661 2,458 2.00 16.00 585 3,043 2.50 16.50 432 3,475 3.00 17.00 345 3,820 3.50 7/7/2008 Stonntech-WQ 03 July 08.xlsx 1 of 1 APPENDIX ;s r� o :y. .ls 1 • 1 .. ) .\� .ice_ Profile Scenario: Base Profile: Profile - 1 Scenario: Base mCo M + E o o. Sm>E 20.00 0+00 18.00 16.00 Elevation (ft) 14.00 1200. 0+50 Station (ft) Title: First Citizens Bank Project Engineer: John Kuzenski k:\._\09_design calculations12008-7-15.stm StormCAD v5.6 (05.06.012.001 07/15/08 05:10:28 PM 0 Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA -1-203-755-1666 Page 1 of 1 Profile Scenario: Base Profile: Profile - 2 Scenario: Base t�.Q_ �­E i o E(n c¢va l I I __— —16512 —.— 15v 4200h 15 ch COuve @S=0.�2424 Wh I Concrete =0.002381 W1t t ! 0,00 0.25 0,50 0.75 1-00 1-25 1.50 Swim ihi 1,75 2.00 20.110 18.00 16.00 Elevakn(h) t4.00 12,00 2-25 Title: First Citizens Bank Project Engineer: John Kuzenski kA—\09_design calculalions\2008-7-15.stm StormCAD v5.6 [05.06.012.001 07/15/08 05: 14:47 PM 0 Bentley Systems, Inc. Haestad Methods Solution Center Watertown, CT 06795 USA +1-203-755-1666 Page 1 of 1 a 1 i 3 THE INSTALLED CHAMBER SYSTEM SHALL PROVIDE THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS SECTION 12.12 FOR EARTH AND LIVE LOADS, WITH CONSIDERATION FOR IMPACT AND MULTIPLE VEHICLE PRESENCES. SC-740 CHAMBER 'i. - 2 INCH CLEAN, CRUSHED. ANGULAR STONE ADS 601 GEOTEXTILE OR EQUAL DESIGN ENGINEER IS RESPONSIBLE FOR ENSURING THE REQUIRED BEARING CAPACITY OF SUBGRADE SOILS' CHAMBERS SHALL MEET ASTM F 2418-05 "STANDARD SPECIFICATION FOR POLYPROPYLENE (PP) CORRUGATED WALL STORMWATER COLLECTION CHAMBERS". GRANULAR WELL GRADED SOILl.AGGREGATE MIXTURES. <35% FINES. COMPACT IN 6 IN LIFTS TO 95% PROCTOR DENSITY. SEE THE TABLE OF ACCEPTABLE FILL MATERIALS. SC-740 END CAP PAVEMENT UNPAVED INSTALLATION WHERE "ING FROM VEHICLES MAY OCCUR, EASE COVER TO 2x INCHES MIN. THIS CROSS SECTION DETAILS THE REQUIREMENTS NECESSARY TO SATISFY THE LOAD FACTORS SPECIFIED IN THE AASHTO LRFD BRIDGE DESIGN SPECIFICATIONS SECTION 12.12 FOR EARTH AND LIVE LOADS USING STORMTECH CHAMBERS THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE SIZING. FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO FOR STORMTECH INFORMATION ASSURE THAT THE STORM WATER SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND CALL 1-888-892-2694 INSTALLED IN ACCORDANCE WITH STORMTECHS MINIMUM REQUIREMENTS. STORMTECH LLC DOES NOT APPROVE PLANS. SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS RESPONSIBLE FOR ALL DESIGN DECISIONS. 'SEE STORMTECH DESIGN MANUAL 6" MIN. DEPTH OF STONE _TO BE DETERMINED BY DESIGN ENGINEER 6" MIN.' 12" MIN. TYP. NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANI ,�A 20 Beaver Road. Suite 104 �:(t�i, Wethersfield. CT 06109 892-2694 �m��• Phone: 28-8401 Fax: 866-328-8401 sUb,,xt.c< sI,xTv Pi¢l MOIgQ¢m¢Ill' vvY Stornnteah.aom STORMTECH SC-740 CROSS SECTION SCALE: NITS CHECKED DATE: 11/01/2005 "CAD No. DRAWN BY: SHEET INSPECTION PORT BY DESIGN ENGINEER 1 WOVEN GEOTEXTILE OR EQUAL, )N STONE AND CHAMBERS SC-740--5'-6' WIDE STRIP SC-310-4' WIDE STRIP STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED, IT IS THE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS. STORMTECH LLC DOES NOT APPROVE PLANS, SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS RESPONSIBLE FOR ALL DESIGN DECISIONS, COVER ENTIRE ROW WITH AASHTO M288 CLASS 2 NON -WOVEN GEOTEXTILE OR EQUAL SC-740--8' WIDE STRIP SC-310--5' WIDE STRIP STORMTECH ENDCAP FOR STORMTECH INFORMATION CALL 1-888-892-2694 NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANUAL 20 Beaver Road, Suite 104 Wethersfield, CT 06109 St0rmTUb1T Phone: 888-892-2694 Fax: 866-328-8401 me�ro�e s:wm..c:er Mcfweamem' WWW.stornntech.conn ISOLATOR ROW PROFILE VIEW SCALE: NTS CHECKED DATE: 1110112005 ACAD N0. DRAWN DY: I SHEET OF FOR STORMTECH INFORMATION CALL 1-888-892-2694 PERFORATED UNDERDRAIN PIPE STORMTECH CHAMBER FOUNDATION STONE BENEATH CHAMBER ADS 601 GEOTEXTILE OR EQUAL 4x PIPE 0 MIN crnolviTECH CHAMBER OUNDATION STONE 3ENEATH CHAMBER GEOTEXTILE OR EQUAL x PIPE 0 MIN DING UNDER DRAINAGE PIPE (PER DESIGN) SECTION A_A STONE BEDDING UNDER DRAINAGE PIPE (PER DESIGN) TO OUTLET CONTROL STRUCTURE SECTION B_B STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECHS MINIMUM REQUIREMENTS. STORMTECH LLC DOES NOT APPROVE PLANS. SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS RESPONSIBLE FOR ALL DESIGN DECISIONS. PERFORATED UNDERDRAIN PIPE ' NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANUAL AAA 20 Beaver Road. Suite 104 �y,,�+ E`,�t3�71 Wethersfield. CT 06109 �7{.onli r�• Phone: 88S-892-2694 Fax: 866-328-8401 5Vb,u CCe SIG.. Fll w .slormtech.Cam UNDERDRAIN DETAIL SCALE: NTS CHECK Date: 11/01/2005 ACAD DRAWN GY: SHEET PAVEMENT 4" PVC RISER SC-740 CHAM AASHTO M288 CLASS 2 NON -WOVEN GEOTEXTILE FOR STORMTECH INFORMATION CALL 1-888-892-2694 FLOOR BOX FRAME AND LID W/S.S. CAP SCREW LID CLOSURE INSPECTION PORT WITH SCREW -IN CAP CLASS "C" CONCRETE AASHTO M288 CLASS 2 FNON-WOVEN GEOTEXTILE MIN. MAX. 14,4 ; INSPECTION PORT TO BE ATTACHED THROUGH rrrKNOCK-OUT LOCATED AT CENTER OF CHAMBER STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER SYSTEM DESIGN ISIN'FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS. STORMTECH LLC DOES NOT APPROVE PLANS, SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS RESPONSIBLE FOR ALL DESIGN DECISIONS. NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANUAL A41 20 Beaver Road, Suite 104 Wethersfield, CT 06109 �•'h. Phone: 888-892-2694 Fax: 866-328-8401 seaxmc=s:am.d«Marocemenr wvw.stormtech.com SC-7LO INSPECTION PORT DETAIL SCALE: NTS I CHECKED E Y: OF ACCEPTABLE FILL MATERIALS STORMTECH SC-310 AND SC-740 CHAMBER SYSTEMS a - _.- 'MATERIAL`LOCATiON - DESCRIPTION - AASHTO M43 ".AASHiO.M745 COMPACTION/DENSITY - :.•;, DESIGNATION DESIGNATION. REQUIREMENT QD FILL MATERIAL FROM 18" ANY SOIL/ROCK MATERIALS, NATIVE N/A NIA PREPARE PER ENGINEER'S PLANS. PAVED TO GRADE ABOVE CHAMBERS SOILS OR PER ENGINEER'S PLANS. INSTALLATIONS MAY HAVE STRINGENT MATERIAL CHECK PLANS FOR PAVEMENT AND PREPARATION REQUIREMENTS. SUBGRADE REQUIREMENTS. © FILL MATERIAL FOR 6' TO 18" GRANULAR WELL -GRADED 3, 357, 4, 467, A-1 COMPACT IN 6" LIFTS TO A MINIMUM 95% ELEVATION ABOVE CHAMBERS SOIL/AGGREGATE MIXTURES, 5, 56. 57, 6, A-2 STANDARD PROCTOR DENSITY. ROLLER GROSS (24' FOR UNPAVED INSTALLATIONS) <35% FINES. 67.68.7.78, A-3 VEHICLE WEIGHT NOT TO EXCEED 12.000 LBS. 8, 89.9. 10 DYNAMIC FORCE NOT TO EXCEED 20,000 LBS. BO EMBEDMENT STONE SURROUNDING CLEAN ANGULAR STONE WITH THE 3, 357, 4, 4fi7, 5, N/A NO COMPACTION REQUIRED AND TO A 6' ELEVATION ABOVE MAJORITY OF PARTICLES BETWEEN 56. 57 CHAMBERS %- 2 INCH OA FOUNDATION STONE BELOW CLEAN ANGULAR STONE WITH THE 3, 357. 4, 4fi7, N/A PLATE COMPACT OR ROLL TO ACHIEVE A CHAMBERS MAJORITY OF PARTICLES BETWEEN 5. 56, 57 95% STANDARD PROCTOR DENSI T Y %- 2INCH PLEASE NOTE: THE LISTED AASHTO DESIGNATIONS ARE FOR GRADATIONS ONLY. THE STONE MUST ALSO BE CLEAN CRUSHED ANGULAR. FOR EXAMPLE, THE STONE MUST BE SPECIFIED AS CLEAN, CRUSHED, ANGULAR NO.4 STONE. AASHTO M286 CLASS 2 NON -WOVEN GEOTEXTILE ALL AROUND ANGULAR STONE _ MAX. ,jG•,C �h 18 MIN. I 6" MIN. O c DEPTH OF STONE A TO BE DETERMINED BY DESIGN ENGINEER B" MiN STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORM WATER SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS. STORMTECH LLC DOES NOT APPROVE PLANS. SIZING. OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS RESPONSIBLE FOR ALL DESIGN DECISIONS. NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANUAL .sA 20 Beaver Road, Suite 104 Wethersfield, CT06109 r �mTd&T Phone: 888-892-2694 „.... Fox: 866-328-8401 Sobsmlace Srormwoier mcnapemenf" wv^vstormte Ch.COm ;TORMTECH ACCEPTABLE FILL MATERIALS SCALE: NT$ CHECKED DATE, 11/01/2005 ACAD No. DRAWN BY: I SHEET OF STORMTECH GENERAL NOTES 1. STORMTECH LLC (-STORMTECH-) REQUIRES INSTALLING CONTRACTORS TO USE AND UNDERSTAND STORMTECH'S LATEST INSTALLATION INSTRUCTIONS PRIOR TO BEGINNING SYSTEM INSTALLATION. 2. OUR TECHNICAL SERVICES DEPARTMENT OFFERS INSTALLATION CONSULTATIONS TO INSTALLING CONTRACTORS. CONTACT OUR TECHNICAL SERVICES REPRESENTATIVE AT LEAST 30 DAYS PRIOR TO SYSTEM INSTALLATION TO ARRANGE A PRE -INSTALLATION CONSULTATION. OUR REPRESENTATIVES CAN THEN ANSWER QUESTIONS OR ADDRESS COMMENTS ON THE STORMTECH CHAMBER SYSTEM AND INFORM THE INSTALLING CONTRACTOR OF THE MINIMUM INSTALLATION REQUIREMENTS BEFORE BEGINNING THE SYSTEM'S CONSTRUCTION. CALL 1-888-892-2694 TO SPEAK TO A TECHNICAL SERVICE REPRESENTATIVE OR VISIT WWW.STORMTECH.COM TO RECEIVE A COPY OF OUR INSTALLATION INSTRUCTIONS. 3. STORMTECH'S REQUIREMENTS FOR SYSTEMS WITH PAVEMENT DESIGN (ASPHALT, CONCRETE PAVERS, ETC.): MINIMUM COVER IS 18 INCHES NOT INCLUDING PAVEMENT; MAXIMUM COVER IS 96 INCHES INCLUDING PAVEMENT. FOR INSTALLATIONS THAT DO NOT INCLUDE PAVEMENT, WHERE RUTTING FROM VEHICLES MAY OCCUR, MINIMUM REQUIRED COVER IS 24 INCHES, MAXIMUM COVER IS 96 INCHES. 4. THE CONTRACTOR MUST REPORT ANY DISCREPANCIES WITH CHAMBER FOUNDATION MATERIALS BEARING CAPACITIES TO THE DESIGN ENGINEER. 5. AASHTO M288 CLASS 2 NON -WOVEN GEOTEXTILE (FILTER FABRIC) MUST BE USED AS INDICATED IN THE PROJECT PLANS. 6. STONE PLACEMENT BETWEEN CHAMBERS ROWS AND AROUND PERIMETER MUST FOLLOW INSTRUCTIONS AS INDICATED IN THE MOST CURRENT VERSION OF STORMTECH'S INSTALLATION INSTRUCTIONS. 7. BACKFILLING OVER THE CHAMBERS MUST FOLLOW REQUIREMENTS AS INDICATED IN THE MOST CURRENT VERSION OF STORMTECH'S INSTALLATION INSTRUCTIONS. 8. THE CONTRACTOR MUST REFER TO STORMTECH'S INSTALLATION INSTRUCTIONS FOR A TABLE OF ACCEPTABLE VEHICLE LOADS AT VARIOUS DEPTHS OF COVER. THIS INFORMATION IS ALSO AVAILABLE AT STORMTECH'S WEBSITE: WWW.STORMTECH.COM. THE CONTRACTOR IS RESPONSIBLE FOR PREVENTING VEHICLES THAT EXCEED STORMTECH'S REQUIREMENTS FROM TRAVELING ACROSS OR PARKING OVER THE STORMWATER SYSTEM. TEMPORARY FENCING, WARNING TAPE AND APPROPRIATELY LOCATED SIGNS ARE COMMONLY USED TO PREVENT UNAUTHORIZED VEHICLES FROM ENTERING SENSITIVE CONSTRUCTION AREAS. 9. THE CONTRACTOR MUST APPLY EROSION AND SEDIMENT CONTROL MEASURES TO PROTECT THE STORMWATER SYSTEM DURING ALL PHASES OF SITE CONSTRUCTION PER LOCAL CODES AND DESIGN ENGINEER'S SPECIFICATIONS. 10. STORMTECH PRODUCT WARRANTY IS LIMITED. SEE CURRENT PRODUCT WARRANTY FOR DETAILS. TO ACQUIRE A COPY CALL STORMTECH AT 1-888-892-2694 OR VISIT WWW.STORMTECH.COM. STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE. THE SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. IT IS THE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS- STORMTECH LLC DOES NOT APPROVE PLANS, SIZING. OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS RESPONSIBLE FOR ALL DESIGN DECISIONS. . NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANUAL �4� 20 Beaver Road, Suite 104 888-892-2694 �'�p,�.�� �5��7. Wethersfield, CT06109 ��• Phax:866-328-8401 a„ ....e..A.,. Fax: 866-328-8401 Svosurlcce Sturm weer momgemenl- v.WW.st OrrTlieCh.0001 S T OP.MTECH GENERAL NOTES SOLE: NT$ CHECKED DATE: H/WT2SO05 ACAD No. 6Y STORMTECH PRODUCT SPECIFICATIONS 1.0 GENERAL 4.1 STORMTECH CHAMBERS ARE DESIGNED TO CONTROL STORMWATER RUNOFF. AS A SUBSURFACE RETENTION SYSTEM, STORMTECH CHAMBERS RETAIN AND ALLOW EFFECTIVE INFILTRATION OF WATER INTO THE SOIL. AS A SUBSURFACE DETENTION SYSTEM, STORMTECH CHAMBERS DETAIN AND ALLOW FOR THE METERED FLOW OF WATER TO AN OU FFALL. 2.0 CHAMBER PARAMETERS 2.1 1 HE CIIAMBER SHALL BE INJECTION MOLDED OF POLYPROPYLENE RESIN TO BE INHERENTLY RESISTANT TO ENVIRONMENTAL STRESS CRACKING (ESCR), AND TO MAINTAIN ADEQUATE STIFFNESS THROUGH HIGHER TEMPERATURES EXPERIENCED DURING INSTALLATION AND SERVICE. 2.2 THE NOMINAL CHAMBER DIMENSIONS OF THE STORMTECH SC-740 SHALL BE 30.0 INCHES TALL, 51.0 INCHES WIDE AND 90.7 INCHES LONG. THE NOMINAL CHAMBER DIMENSIONS OF THE STORMTECH SC-310 SHALL BE 16.0 INCHES TALL, 34.0 INCHES WIDE AND 90.7 INCHES LONG, THE INSTALLED LENGTH OF A JOINED CHAMBER SHALL BE 85.4 INCHES. 2.3 THE CHAMBER SHALL HAVE A CONTINUOUSLY CURVED SECTION PROFILE. 2.4 THE CHAMBER SHALL BE OPEN -BOTTOMED. 2.5 THE CHAMBER SHALL INCORPORATE AN OVERLAPPING CORRUGATION JOINT SYSTEM TO ALLOW CHAMBER ROWS OF ALMOST ANY LENGTH TO BE CREATED. THE OVERLAPPING CORRUGATION JOINT SYSTEM SHALL BE EFFECTIVE WI TILE ALLOWING A CHAMBER TO BE TRIMMED TO SHORTEN ITS OVERALL LENGTH. 2.6 THE NOMINAL STORAGE VOLUME OF A JOINED STORMTECH SC-740 CHAMBER SHALL BE 74.9 CUBIC FEET PER CHAMBER WHEN INSTALLED PER STORMTECH'S TYPICAL DETAILS (INCLUDES THE VOLUME OF CRUSHED ANGULAR STONE WITH AN ASSUMED 40% POROSITY). THIS EQUATES TO 2.2 CUBIC FEET OF STORAGE/SQUARE FOOT OF BED. THE NOMINAL STORAGE VOLUME OF AN INSTALLED STORMTECH SC-310 CHAMBER SHALL BE 31.0 CUBIC FEET PER CHAMBER WHEN INSTALLED PER STORMTECH'S TYPICAL DETAILS (INCLUDES THE VOLUME OF CRUSHED ANGULAR STONE WITH AN ASSUMED 40% POROSITY). THIS EQUATES TO 1.3 CUBIC FEET OF STORAGE/SQUARE FOOT OF BED. 2.7 THE CHAMBER SHALL HAVE FORTY-EIGHT ORIFICES PENETRATING THE SIDEWALLS TO ALLOW FOR LATERAL CONVEYANCE OF WATER. 2.8 THE CHAMBER SHALL HAVE TWO ORIFICES NEAR ITS TOP TO ALLOW FOR EQUALIZATION OF AIR PRESSURE BETWEEN ITS INTERIOR AND EXTERIOR. 2.9 TFIE CHAMBER SHALL IiAVE BOTH OF ITS ENDS OPEN TO ALLOW FOR UNIMPEDED HYDRAULIC FLOWS AND VISUAL INSPECTIONS DOWN A ROWS ENTIRE LENGTH. 2.10 THE CHAMBER SHALL HAVE 14 CORRUGATIONS. 2.11 THE CHAMBER SHALL HAVE A CIRCULAR, INDENTED, FLAT SURFACE ON THE TOP OF THE CHAMBER FOR AN OPTIONAL 4-INCH INSPECTION PORT, 2.12 THE CHAMBER SHALL BE ANALYZED AND DESIGNED USING AASHTO METHODS FOR THERMOPLASTIC CULVERTS CONTAINED IN THE LRFD BRIDGE DESIGN SPECIFICATIONS, 2ND EDITION, INCLUDING INTERIM SPECIFICATIONS THROUGH 2O01. DESIGN LIVE LOAD SHALL BE THE AASHTO HS20 TRUCK. DESIGN SHALL CONSIDER EARTH AND LIVE LOADS AS APPROPRIATE FOR THE MINIMUM TO MAXIMUM SPECIFIED DEPTH OF FILL. 2.13 THE CHAMBER SHALL BE MANUFACTURED IN AN ISO 9001:2000 CERTIFIED FACILITY. 3.0 END CAP PARAMETERS 3.1 END CAPS WITH PREFABRICATED PIPE CONNECTIONS SHALL BE INJECTION MOLDED FROM POLYETHYLENE RESIN. 3.2 THE END CAP SHALL BE DESIGNED TO FIT INTO ANY CORRUGATION OF A CHAMBER, WHICH ALLOWS: CAPPING A CHAMBER THAT HAS ITS LENGTH TRIMMED; SEGMENTING ROWS INTO STORAGE BASINS OF VARIOUS LENGTHS. 3.3 THE END CAP SHALL HAVE SAW GUIDES TO ALLOW EASY CUTTING FOR VARIOUS DIAMETERS OF PIPE THAT MAY BE USED TO INLET THE SYSTEM. 3.4 THE END CAP SHALL HAVE EXCESS STRUCTURAL ADEQUACIES TO ALLOW CUTTING AN ORIFICE OF ANY SIZE AT ANY INVERT ELEVATION. 3.5 THE PRIMARY FACE OF AN END CAP SHALL BE CURVED OUTWARD TO RESIST HORIZONTAL LOADS GENERATED NEAR THE EDGES OF BEDS. 3.6 THE END CAP SHALL BE MANUFACTURED IN AN ISO 9001:2000 CERTIFIED FACILITY. STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYW T THAT WILL IIANGLE THE DESIGN VOLUME LISTED ABOVE, THE SIZING. FIT ANDAPPLICMILITY OF THE STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. R IS THE OLT IMQE RE SPONSIBII ITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STCRMWATER SYSTEM DESIGN MIN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECH PRODUCTS MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECH'S MINIMUM REQUIREMENTS. STORM TECH LLC DOES NOT APPROVE ELMS, SIZING, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS RESPONSIBLE FOR ALL DESIGN DECISIONS. NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANUAL ��� 20 Beaver Rood, Suite 104 r 6w�`i�, Wethersfield, CT 06109 �7LM ,'�'1TC{r7r Phone: 888-892-2694 Fox: 866-328-8401 SubwHoce slo,m^ l&W .stormtech.com STORMTECH PRODUCT SPECIFICATIONS CHECKED ACAD No. OF D it 4' SCH 40 PIPE =CTION PORT NOMINAL CHAMBER SPECIFICATIONS SIZE (W x H x INSTALLED LENGTH) - CHAMBER STORAGE - MINIMUM INSTALLED STORAGE - WEIGHT - STUBS AT TOP OF END CAP FOR PARTS NUMBERS ENDING WITH'F' 51.0' x 30.0`x 85.4' 45.9 CUBIC FEET 74.9 CUBIC FEET 75 CBS. STUBS AT BOTTOM OF END CAP FOR PARTS NUMBERS ENDING WITH'B' PART# CHAMBER PIPE SIZE A B C SC740EPE06T SC-740 6 in (150 mm) 10.90 in (277 mm) 18,50 in (470 mm) N/A SC740EPE06B SC-740 6 in It 50 mm) 10.90 in (277 mm) N/A 0.50 in (13 mm) SC740EPEOBT SC-740 8 in (200 mm) 12.20 in (310 mm) 17.50 in (445 mm) N/A SC740EPE08B SC-740 8 in (2DO mm) 12.20 in (310 mm) NIA 0.6D in (15 mm) SC740EPEIOT SC-740 10 in (250 mm) 13.40 in (340 HIM) 15.50 In (394 mm) N/A SC740EPEIOB SC-740 /0 in (250 mm) 13.40 in (340 mm) N/A 0.70 in (18 DDI SC740EPE12T SC-740 12 in (300 Tim) 14.70 in (373 mm) 12.50 in (318 Him) N/A SC74DEPE128 SC-740 12 in (300 mm) 14,70 in (373 mm) N/A 1.20 in (30 mm) SC740EPE15T SC-740 15 in (375 mm) 18.40 in (467 mm) 9.00 in (229 mm) NIA SC740EPE15B SC-740 15 in (375 mm) 18,40 in (467 mm) N/A 1.30 in (33 mm) SC74DEPE18T SC-740 18 in (450 mm) 1910 in (5DO mm) 5.00 in (127 mm) N/A SC740EPE18B SC-740 18 in (450 mm) 19.70 in (500 mm) NIA 1.60 in (41 mm) SC740EPE24B SC-740 24 in (600 mm) 18.50 in (470 mm) NIA 0.10 in (3 mm) NOTEALL DIMENSIONS ARE NOMINAL ALL STUBS, EXCEPT FOR THE SC740EPE24B ARE PLACED AT BOTTOM OF END CAP SUCH I THAT THE OUTSIDE DIAMETER OF THE STUB IS FLUSH WITH THE BOTTOM OF THE END CAP. FOR ADDITIONAL INFORMATION CONTACT STORMTECH AT 1-888-892-2694. * FOR THE SC740EPE24B THE 24- em- STUB LIES BELOW THE BOTTOM OF THE END CAP APPROXIMATELY 1.75'. BACKFILL MATERIAL SHOULD BE REMOVED FROM BELOW THE N-12 STUB SO THAT THE FITTING SETS LEVEL. ' NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANUAL 20 Beaver Road, Suite 104 Effi'3�7, Wethersfield, CT 06109 �y,�r Phone: 888-892-2694 ,�.....,�..,.,, 5ubwrmce Slormwler Mona I Fax: 866-328-8401 I 1 h STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER 9 V✓W V.5 arm eC .com THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE ABED LAYOUT THAT WILL HANDLE THE DESIGN VOLUME LISTED ABOVE, THE SIZING, FIT AHD APPLICABILITY OF THE SC-740 TECHNICAL SPECIFICATIONS I STORMTECH CHAMBER SYSTEM FOR THIS SPECIFIC PROJECT HAS NOT BEEN DETERMINED. It IS THE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORM WATER SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE LAWS AND REGULATIONS. STORMTECHPRODUCTS SCALE: NTS CHECKED MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECHS MINIMUM REOUIREMENTS. STORMTECH LLC DOES NOT APPROVE PLANS SONG, OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS DATE' B/15720D6 ACAD No. RESPONSIBLE FOR ALL DESIGN DECISIONS, DRAWN BY: SHEET OF STORMWATER CHAMBER SPECIFICATIONS 1. Chambers shall be StormTech SC-740, SC-310 or approved equal. 2. Chambers shall conform to the requirements of ASTM F2418-05, "Standard Specification for Polypropylene (PP) Corrugated Wall Stormwater Collection Chambers". - 3. Chamber rows shall provide continuous, unobstructed internal space with no internal support panels. '4. The structural design of the chambers, the structural backfill and the installation requirements shall ensure that the load factors specified in the AASHTO LRFD Bridge Design Specifications, Section 12.12 are met for: 1) long -duration dead loads and 2) short -duration live loads, based on the AASHTO Design Truck with consideration for impact and multiple vehicle presences. 5. Only chambers that are approved by the engineer will be allowed. The contractor shall submit (3 sets) of the following to the engineer for approval before delivering chambers to the project site: a. A structural evaluation by a registered structural engineer that demonstrates that the load factors specified in the AASHTO LRFD Bridge Design Specifications, Section 12.12 are met. The 50-year creep modulus data specified in ASTM 2418-05 must be used as part of the AASHTO structural evaluation to verify long-term performance. b. A certification by the manufacturer that the chambers are in accordance with ASTM F2418-05. 6. Chambers shall be produced at an ISO 9001 certified manufacturing facility. 7. All design specifications for chambers shall be in accordance with the manufacturer's latest design manual. 8. The installation of chambers shall be in accordance with the manufacturer's latest installation instructions. STORMTECH LLC CONCEPTUAL PLAN DISCLAIMER THIS STORMTECH CHAMBER SYSTEM LAYOUT WAS PRODUCED TO DEMONSTRATE A BED LAYOUT THAT WUL HANDLE THE DESIGN VOLUME LISTED ABOVE, THE SIZING, FIT AND APPLICABILITY OF THE STORMTECH CHAMBER SYSTEM FOR TwS SPECIFIC PROJECT HAS NUT BEEN DETERMINED. 7 5 TIE ULTIMATE RESPONSIBILITY OF THE DESIGN ENGINEER TO ASSURE THAT THE STORMWATER SYSTEM DESIGN IS IN FULL COMPLIANCE WITH ALL APPLICABLE DAWS AND REGULATIONS. STORMTECH PROpKTS MUST BE DESIGNED AND INSTALLED IN ACCORDANCE WITH STORMTECHS MINIMUM REQUIREMENTS. STORMTECH LLC DOES NOT APPROVE PLANS. SIZING. OR SYSTEM DESIGNS. THE DESIGN ENGINEER IS RESPONSIBLE FOR ALL DESIGN DECISIONS. NOTE: CHAMBER SYSTEM DESIGN MUST BE IN ACCORDANCE WITH STORMTECH DESIGN MANUAL A!�,, 20 Beaver Road, Suite 104 Wethersfield, CT 06109 S,tlonnTecht Phone: 888-892-2694 ...... Fax: 866-328-8401 Submnace smrmwnle...... mem- vvvnv.stormfech.conT STORMWATER CHAMBER SPECIFICATIONS DATE: 11/14/2005 1 ACAD No. DRAWN BY: SHEET APPENDIX It" . �".•rye � r 9� � a Chapter 2 Estimating Runoff Technical Release 55 Urban Hydrolugy for Small Watersheds Table 2-2c Runofl' curve numbers for other a ricultnial lands it Curve numbers for -- Cover description ---- — --- hydrologic soil group— Hydiologic Cover type condition A U C D Pasture, grassland, or range —continuous forage for grazing. Z' Meadow —continuous grass, protected from grazing and generally mowed for hay. 13r sl —brush-weer)-grass mixture with brush the nnior element. al Woods —gnus combination (orchard or tree I'arni). N Woods. 5' Poor 68 79 86 89 Fair 49 69 79 84 Good 39 61 74 80 — 30 58 71 78 Poor 48 67 77 &3 Fair 35 56 70 77 Good 30.y 48 65 73 Pool' 57 73 82 86 Fair 43 65 76 82 Good 32 58 72 79 Poor 45 66 77 83 Fair 36 60 73 79 Good 30.11 55 70 77 Farmsteads —buildings, lanes, driveways, — 59 74 82 86 and surrounding lots. I Average rmroff condition, and f„ = 0.2S. x Pau': <5096) ground cover or heavily grazed with no mulch. Fair: 50 to 75%ground cover and not heavily grazed. Cool., > 75%ground cover and lightly or only occasionally grazed. a Poor. <50% ground cover. Fair: 50 to 75%ground cover. Cood: >75% ground cover. .t Actual curve number is less than 30; use CN = 30 for runoff computations. 5 ON's shown were computed for areas with 50% woods ;in(] rW grass (pasture) cover. Other conibinat ions of conditions may be computed from the CN's for woods and pasture. Q Poore Forest litter, small trees, and blush are destroyed by heavy grazing or regular horning. Fair. Woods are grazed but notburned, and some forest litter rovers the, soil. Coo& Woods are protected from grazing, and litter and brash adequately cover We soil. (210-VI TR-65, Second Ed.,June 1986) 2-7 Precipitation Frequency Data Server Page 1 of 4 POINT PRECIPITATION FREQUENCY ESTIMATES _ FROM NOAA ATLAS 14 North Carolina 33.909 N 78.075 W 0 feel from "Precipitation -Frequency Atlas of the Untied Stales" NOAA Atlas 14, Vol nine 2, Version 3 G.M. Rennin, D. Manin, B. Lin, 1'. Parzybok, M.Yelaa, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland, 2004 Extracted: Mon Mary 5 2008 Confidence Limits Seasonality I Location Maps I Other Info. GIS data Maps I Help Precipitation Frequency Estimates (inches) 0mm m (12 4d daX 3a.07y d086108 cl4a5y rl6a0y =00 A8 4 4 5 57 4 .20 869 7 13.35 16.30 0.64 1.03 1.29 1.78 2.23 2.70 2.87 3.62 4.24 4.92 5.C,4 6.17 6.96 7.76 10.36 12.80 15.79 19.20 0.74 1.19 1.50 2.14 2.74 3.39 3.63 4.58 5.41 6.38 7.23 f81 8.75 9.61 12.62 15.36 18 70 22.46 IO 0.83 1.33 L68 2A3 3.17 4.00 432 SA6 6.49 7.64 8.61 9.21 10.24 I LI5 14.48 17.42 21.04 25.03 25 0.93 L49 1.89 2.80 3.72 4.83 5.29 6.71 8.03 9.58 10.70 11.29 12.4I 13.37 17.12 20.26 24.26 28A8 5(1 1.02 1.62 2.05 3.09 4.19 5.56 6.15 7.82 9A2 11.30 12.54 13. 88 14.23 15.23 19.29 22.54 26.81 31.14 I(10 I.10 1.75 2.21 3.38 4.66 632 7.08 I 9.04 10.95 13.25 F14.61 I5.05 16.21 E23 E57 24.88 29.41 33.80 2t10 I,IS 1.87 2.36 3.68 5.16 7.16 8.11 10.39 12.C,8 15.47 1694 I7.23 18.37 19.38 23.99 27.30 3208 36.47 5(10 1.29 2A4 2.57 4.(19 5__ 8.37 9.64 12.44 15.30 18.91 20.50 20.G5 21.50 22.50 2f43 30.64 35.72 40.01 1000 1.38 2.18 2.73 4�12 6.46 9.43 II.01 14.27 17.G9 2 L95 23.62 23.85 24.15 25.09 30.24 33.27 38.58 42.72 *These precipitation frequency estimates are based on a partial duration series, ARI is the Average Recurrence Interval. Please refer to the documentation for more information. NOTE: Formatting forces estimates near zero to appear as zero. G * Upper bound of the 90% confidence interval Precipitation Frequency Estimates (inches) ARI*" (yea rs) 5 min Ill min IS min 311 min 6(1 min 1211 min 3 hr 6 lu• 12 hr 24 hr 48 hr 4 d:iy 7 clay I11 day 20 day 311 day 4� da}' 611 day =I 0.58 0.93 1.16 1.59 1.99 2.41 2.59 3.27 3.88 4.47 5.1 I 5.57 6.22 6.96 9.31 11.47 14.18 17.23 �2 0.69 I.I I 1.39 L93 2.42 2.94 3.16 4.00 4.73 5.43 6.19 6.72 7.51 8.35 1 I.10 13.63 16.77 20.32 0 0.80 1.28 1.62 2.31 2.96 3.70 399 5.06 6.04 7.02 7.96 8.51 9.44 10.34 13.53 16.36 19.87 23.78 (19 4.36 44 62 A.47 10.030 .0 2155 152 8.5 .37 2910 6.4 25 1.00 1.60 2.03 3.01 4.00 5.26 5.80 7.38 8.92 10.53 11.78 12.30 13.39 14.40 18.33 21.57 25.81 30.16 511 1.09 1.74 2.21 3.32 4.50 6.05 6.74 8.60 10.45 12.43 13.85 14.27 15.38 16.43 20.68 24.05 28.55 33.03 I(10 1.18 1.88 2.38 3.64 5.01 6.88 7.75 9.93 12.14 14.60 16.18 16.46 17.57 18.63 23.23 26.62 31.39 35.93 200 1.27 2.02 2.55 3.96 5.56 7.79 8.87 11- 14.04 17.10 18.83 18.95 19.96 21.05 25.97 2933 34.36 38.89 1.39 2.20 2.77 4.41 6.33 9.13 IO.S7 13.69 1697 21.00 22.93 23.16 23.57 24.63 29.93 33.15 38.53 42.92 1000 L50 2.36 2.96 4.79 6.99 10.31 12.09 15.74 19.59 24.57 26.G1 26.88 27.15 27.67 33.20 36.19 41.88 46.08 I ne upper Donna of [no connaence Interval at w-/. conliaenca level is the value which a%of me simulated quaetAe values for a given frequency are greater than. "These precipitation frequency estimates are based on a partial duration series. ARI is the Average Recurrence Interval. Please refer to the documentation for more information. NOTE: Formatting prevents estimates near zero to appear as zero. * Lower bound of the 90%) confidence interval Precipitation Frequency Estimates (inches) ARI 5 10 IS 30 60 120 3 6 12 24 48 4 7 10 20 30 4a 60 (years) min min min min min min hr hr hr hr hr day day day day day day day littp:Hhdse. n ws.noaa. gov/cg i-bin/lidsc/bLIi Idout. pe rl'?type=p f& un i tS=us&series=pd&statena... 5/5/2008 Precipitalion Frequency Data Server Page 2 of 4 0.50 0.80 I.00 1.38 1.72 2.04 2.17 2.72 3.16 3.72 4.30 4.73 5.38 6.06 8.16 10.16 12.61 15.45 0 0.60 0.95 1.2- 566 2.08 2.49 2.64 3.31 3.84 4.52 5.20 5.71 6.50 7.26 9.72 12.06 14.91 18?0 0.69 I.10 1.39 198 2.54 3.12 3.32 E]E 4.89 5.84 6.64 7.21 8.15 896 11.81 14.45 1262 21.25 Ill 0.77 1.23 I.55 2.25 2.92 3.67 3.94 4.96 5.83 6.97 7.87 8.46 9.49 10.37 I3.52 16.35 19.79 23.64 0863742742A 40 6 68 9 2 2 5 8.9 227 68025 5(1 0.93 ES I.88 2.83 3.83 5.05 5.54 7.01 8.34 10.11 11.23 I1.82 13. 11 13.97 17.80 20.96 25.02 29.23 l0U 1.00 1.59 2.01 3.(I8 4.24 5.71 6.33 8.03 9.60 11.71 12.91 13.46 14.68 15.68 19.75 22.99 27.29 31.58 2011 1.07 1.69 2.14 3.33 4.67 6A2 Z 19 9.14 11.00 13.47 14.82 15.23 16.44 17.45 21.79 25.04 29.56 33.87 500 I.IS 1.82 2.30 3.65 5.24 7A2 8.44 10.79 13.08 I6.10 17.58 17.91 18.94 19.95 24.54 27.79 32.57 36.86 I(11111 1.23 L93 2 �12 392 5.72 8.30 9.53 I2.24 14.89 18.34 19.90 20.15 2095 21.95 26.72 29.91 3490 39.1 I ' the lower bound of toe confidence Interval at W%confidence level is the value which 59 of the simulated quanllle values for a given frequency are less than. "These precipitation frequency estimates are based on a parralduration maxima series. ARI is the Average Recurrence Interval. Please refer to the documentation for more information. NOTE: Formatting prevents estimates near zero to appear as zero. rText version of tables _, Partial duration based Point Precipitation Frequency Estimates - Version: 3 33.909 N 78.075 W 0 ft 44 42 40 38 36 34 32 30 r 28 i 26 a 24 0 22 20 v 18 a 16 14 i 12 10 8 6 4 2 0 1 2 3 4 5 6 7 8 910 20 30 40 50 80 100 140 200 300 500 700 1000 Averatte Recurrence Interval (years) Pion Nay 05 09:03:29 2008 Duration 5-min - 48-hr -I!- 30-day i 10-min 4-day -+- 15-min7-day -x- 60-day -:�- 30-min a 12-hr 10-dsu -+- 60-min - - 24-hr -a- 20-dau -o- http://hdse.iiws.iioaa.gov/cgi-bin/hdse/bui Idout.per]?type=pf&units=us&series=pd&stateiia... 5/5/2008 Precipitation Frequency Data Server Page 3 of 4 I Partial duration based Point Precipitation Frequency Estimates - Version: 3 33.909 N 78.075 11 0 ft 44 42 40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 6 6 4 2 0 C C C C C C E L L L L L i L E E E E E £ 0 I I I I I 1 I I I I I I I I N CI a �O m N m a -' •' M m u. Duration Mon May 05 09:03:29 2008 Maps - L L T n T 7' n t L Q N N N N N N N -e N I I a a a a a a s a a s M V M V N (\ 0 N 0 0 Yl Average Recurrence Interval (years) 1 -R- 2 +- 100 — 10 -a 500 -+- 25 -i 1000 -a These maps were produced using a direct map request from the U.S. Census Bureau Mapping and Cartographic Resources Tiger -Map Server. liUp://hclsc.iiws.noaa.gov/cgi-bin/hdse/bui ldout.perl?type=pf&writs=us&series=pd&statena... 5/5/2008 Precipitation Frequency Data Server Page 4 of 4 z Please read disclaimer for moo e lnfornmtion z c LEGEND — State — Connector — County I7-1 Streato Indian Resv Military Area Lake/Pond/Ocean National Park — Street Other Park — Expressway 0 City — H ighway �� C(�urtty 5 8 °; Scale 1:228583 2 r. mi 11 8resol�ution r-'taveraoe--true scale depends on monitor Other Maps/Photographs - View_USCS digital orthophoto quadrangle (UOQ) covering this location 4om'I'erraServer; USGS Aerial Photograph may also be available from this site. A DOQ is a computer -generated image of an aerial photograph in which image displacement caused by terrain relief and camera tilts has been removed. It combines the image characteristics of a photograph with the geometric qualities of it map. Visit the USCS for more information. Watershed/Stream Flow Information - rind the Watershed for this location using the U.S. Environmental Protection Agency's site. Climate Data Sources - Precipitation fi•equencv results are based on data from a variety ofsources, but largely NCDC'. The following links provide general information about observing siles in the area, regardless of iij'their data was used in this study. For detailed information about the stations used in this .study, please refer to our documentation. Using the National Climatic Data Center's (NCDC) station search engine, locate other climate stations within: +/-30 minutes OR +j-1 degree of this location (33 909/-78.075). Digital ASCII data can be obtained directly from NCDC. lipirometcorological Design studies Center DOC/NOAA/National Weather service 1325 East-West Ilighway Silver spring, M1ln 20910 (3111) 713-1669 Questions?: HUSC.Quesfions a noua.gov Disclaimer http://hdsc.iiws.noaa.gov/cgi-bin/hdsc/bLliIdout. perl?type=pl &units=us&series=pd&statena... 5/5/2008 Precipitation Frequency Data Server Pagel of4 POINT PRECIPITATION FREQUENCY ESTIMATES_ FROM NOAA ATLAS 14 North Carolina 33.909 N 78.075 W 0 feet from "Precipilalion-Frequency Atlas of the United Stales" NOAA Allus 14, Volume 2, Version 3 G.M. nonnin, O. Martin, B. Lin, T. Parzybok, M.Yekm, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland, 2004 Extracted: Tee Jul 15 2008 Confidence Limits Location Maps Other Info. I GIS data I Maps I Help I Doc; U.S. Map Precipitation Intensity Estimates (in/hr) AEIx* Q-in- Y) 5 min I11 min I_5 min 311 min 6(I min 120 mm ❑ 3 Irr 6 hr - 12 hr 24 Irr 4N hr 4 do ������ Ud 10 da 20. da , 30 da 45 da 7.0E 5.67 4.75 3.28 2.06 1.24 0.88 0.56 0.32 0.19 O.I I 0.06 0.04 0.03 0.02 0.02 0.01 Eo 8.70 6.97 5.88 4.18 2.68 1.66 1.1E 0.75 0.44 0.2E 0.15 0.08 0.05 0.04 0.03 0.02 0.02 C 986 78 6.65 4.823 9 42 0 0 0 0 0 0 0 002 02Ill Eo 25 11.16 8.90 7.52 5.57 3.71 2.41 1.75 1.12 0.66 0.40 0.22 0.12 0.07 0.06 0.04 0.03 0.02 Eo 511 12.1G 9.68 8.18 6.16 4.17 2.77 2.04 1.30 0.78 OA7 0.26 0.14 0.08 0- 0.04 0.03 0.02 Eo I11(1 13.15 10.45 8.80 6.74 4.64 3.15 2.35 1.50 0.91 0.55 0.30 0.16 0.10 0.07 0.04 0.03 0.03 C 2110 14.13 11.20 9.42 7.33 5.14 3.5(, 2.69 1.73 I.OS 0.64 0.35 0.18 0.11 0.08 0.05 0.04 0.03 C 511(1 15.42 12.19 10.23 8.14 5.84 4.17 3.20 2.07 L27 0.78 0.43 0.21 0.13 0.09 0.0 00.04 0.03 10(10 16.52 13.01 10.88 8.81 6.43 4.70 3.C,5 2.37 1.46 0.91 0.49 0.25 0.14 0.10 0.06 0.05 0.04 These precipitation frequency estimates are based on an annual maxima series. AEP is the Annual Exceedance Probability. Please refer to die documentation for more information. NOTE: Formatting forces estimates near zero to appear as zero. * Upper bound of the 90%k confidence interval Precipitation Intensity Estimates (in/hr) 5V) 10[nit. min min min min min hr hr hr hr hr clay clay day day clay day 7.66 6.12 5.13 3.55 2.22 136 097 0.61 0.36 0.21 0.12OF067 OF041 0.03 0.02 0.02 0.01 0 0 9 4 7.52 6.35 4.51 2.89 1.81 1.30 0.83 0.49 0.29 0.16 0.09 0.05 0.04 0.03 0.02 0.02 C 10 10.62 8.50 7.16 5.19 3.38 2.16 1.56 1.00 0.59 0.35 0.20 0.10 0.07 0.05 0.03 0.03 0.02 EO 25 12.01 9.57 8.09 5.99 3.99 2.62 1.92 1.23 0.74 0.44 0.24 0.13 0.08 0.06 0.04 0.03 0.02 C 511 13.08 10.41 8.79 Ej 4.48 EE 2.23 1.43 0.86 0.52 0.29 0.15 0.09 0.07 0.04 0.03 0.03 C 100 14.15 11.24 9.47 7.25 499 3.43 2.57 L65 I.00 0.61 0.34 0.17 0.10 0.08 0.05 0.04 0.03 200 15.21 12A7 10.15 7.90 5.54 3.88 294 I.90 I.I6 0.71 0.39 0.20 0.12 0.09 0.05 0.04 0.03 5(10 16.65 13.17 11. 55 8.7E 6.30 4.55 3.51 2.28 L 0.87 0.48 0.24 0.14 0.10 0.06 0.05 0.04 C 1000 17.88 14.08 11.78 9.54 6.96 5.14 4.01 2.62 LC>2 1.02 0.55 0.28 0.16 0.11 0.07 0.05 0.04 ' The maser bound of the confidence interval at 90%confidence level is the value which 5%of the simulated ouantile values for a civen frenuency are areater than. "These precipitation frequency estimates are based on an annual maxima series. AEP is the Amoral Exceedance Probability. Please refer to the documentation for more information. NOTE: Fonnattlng prevents estimates near zero to appear as zero, hffiri- brio nwc non7/1 C/7MR Exhibit A: Hydrologic Soil Groups for the United Stales KORNMAN..................................... C KOROBAGO.................................. C KORONIS.....................................- B KORTTY......................................... B KOSETH......................................... B KOSMOS........................................ D KOSSE........................................... B KOSSUTH.................................. BID KOST............................ ............ .... - A KOTO............................................. D KOTZMAN...................................... B KOUNTER............... --- ..... .......... - D KOURY........................................... B KOYNIK.......................................... D KOYOKEE...................................... C KOYUKTOLIK................................ D KRACKLE....................................... B KRADE........................................... B KRAKON........................................ D KRAKOW........................................ B KRAM............................................. D KRANSKI........................................ B KRANZBURG................................. B KRAUSE......................................... B KR EAM ER ...................................... C KREBS........................................... B KREFT..........................................-C KREM...................................... ..... -A KRENKA......................................... B KR ESSON...................................... C KREYENHAGEN ........................... B KREZA............................................ D KRIER.............................................D KRIEST...................... ...... - ........ .... B KROME.......................................... A KRON............................................. D KROTO........................................... B KRUBATE...................................... B KRUEGER.................. ........... - .... ... C KRUM............................................. D KRUTAR......................................... B KUBE................................ - ........ .... B KUDLER......................................... C KUBLI................................... -........ D KUCKUP......................................... A KUDLAC......................................... C KUKAIAU........................................ A KUKAIAU, Bedrock Substratum ... B KUKVEY......................................... A KULA.............................................. B KULLIT............ ................ - ........ -... B KULSHAN........................... ........... C KUNAYOSH............. -.................... A KUNCEIDER.................................. A KUNIA............................................. B KUNUWEIA..... ......................... - .... C KUPREANOF................................. B KUPREANOF, Moderately Wet .... C KUR EB........................................... A KURK.............................................. C KURO............................................. D KURSTAN...................................... B KURTE N......................................... D KURTH........................................... C KU RTZ............................................ C KUSAL............................................ C KUSDRY......................................... C KUSHNEAHIN ..............................- D KUSKOK W IM................................. D KUSLINA........................................ D KUSLINAD..................................... D KUSSHI.......................................... B KUTLER.........................................0 KUVASZ........ .......... .......... .......... ...0 KUY................................................ A KVICFIAK......... .............................. B KWAKINA....................................... B KWATAHEIN.................................. B KWEO............................................. A KYBURZ......................................... B KYDAKA......................................... D KYGER........................................... B KYLE.............................................. D KZIN................................................ D LA FARGE...................................... B LA GRANDE... ........ ................... ... C LA POSTA...................................... B LA ROSE ........................................ B LABELLE........................................ D LASETTE....................................... C LABKEY......................................... B LABLUE.......................... --............ D LABORCITA................................... B LABOU............. ..... -....................... D LABRE............................................ B LABSHAFT..................................... D LABU... ... ...... -- .............................. D LABYRINTH ................................... A LACERDA........................... ........... D LACESCREEK.........................._... B LACKSCREEK ........ .................... .. C LACLEDE....................................... B LACONNER.... ............................ .. C LACOOCHEE................................. D LACOSTE ._.................................... C LACOTA..................................... BID LACRESCENT ................. B LACROL.... .... - ............................... D LADERLY...... .................. .............. C LADNER......................................... D LADD.............................................. B LADRON......................................... B LADUE............................................ B LADYBIRD ..................................... B LADYCOMB................................... D LADYSMITH................................... D LAFAYETTE.......... .................. -..... B LAFE............................................... D LAFOLLETTE................................. B LAGITOS........................................ C LAGLORIA..................................... B LAGO.............................................. C LAGONOT...................................... C LAGRANGE................................... D LAGROSS...................................... A LAGUN ITA..................................... C LAHAINA........................................ B LAHOGUESS................................. B LAHOOD........................................ B LAHRITY.... .............................. ...... C LAHTIDA........................................ C LAINAND........................................ B LAIRDSVILLE ........- ...................... D LAKASH......................................... B LAKASKIA...................................... D LAKE.............................................. A LAKE, Clayey Surface...................0 LAKE CHARLES ... ................... ...... D LAKEBEDDER ............................... B LAKEFIELD.................................... B LAKELAND....................................A LAKEPARK................................ BID LAKESHORE................................. B LAKESHORE................................. D LAKESOL....................................... B LAKETON....................................... C LAKEWOOD ................................... A LAKIN............................................. A LAKOMA......................................... D LAKOTA.............. ................... -...... D LAKRIDGE.......... ......... ................. C LALAAU.......................................... A LALINDA...-.... .... .......... -............... B LALOS............................................ B LAM................................................ D LAMA.............................................. C LAMADRE...................................... B LAMANGA...................................... C LAMAR........................................... B LAMARSH...................................... C LAMARTIN E................................... C LAMATH......................................... D LAMAWA........................................ B LAMBERJACK ...... ............. --........ B LAMBMAN............................. - ...... C LAMBRANCH......- ......................... D LAMBUTTE.................................... B LAMEDEER................................... B LAMESA......................................... D LAMESHUR................................... A LAMINE.......................................... D LAMINGTON.................................. D LAMKIN.......................................... B LAMOILLE...................................... B LAMOTTE...................................... B LAMPASAS.................................... D LANARK............... - ....... - ........ ....... B LANCASTER................. - ........ ....... B LANCE. .......... .......... ..................... B LAND .................... - ....... -........... BIC LANDAVASO................................. B LAN DCO................ ......... -.............. C LANDINGHAM ............................... B LANDMAN..................... ......... -...... B LAN DO ........................................... C LANDUSKY.................................... A LANEVILLE........... ............... B LANEXA....--...... ............. ..............D LANEY............................................ B LANFAIR........................................ B LANGDON...................................... A LANGELLAIN......................... D LANGER..............................-......... A LANGLADE.................................... B LANDLESS .................................... C LANGLOIS..................................... D LANGOLA...................................... C LANGSPRING................................ B LANGSTON................................... B LANGWELL.................................... D LANIER.......................................... A LANIP............................................. B LANKBUSH.................................... B LANOAK......................................... B LANONA............... ..... -- .... ......... ... B LAN S DO W N E................................ C LANTERN ....................................... 8 LANTIS........................................... B LANTON, Low Rainfall..................0 LANTON......................................... D LANTONIA..................................... B LANTRY......................................... B LAN TZ......................... -................. D LANYON............................... -.... CID LAOLAO......................................... B LAONA................ ....... - ......... ......... B LAPARITA.................. .......... ......... .0 LAPHAM......................................... A LAPLATTA..................................... C LAPOINTE.............. .... - ....... .......... . C LAPON............. - ........ .............. ..... . D LAPPANS..................................... - A LAPWAI.......................................... B LARA-............................................ C LARCHMOUNT .............................. B LARCHPOINT................................ C LARES............................................ C LARIAT ........................................... B LARIC............................................. D LARIM............................................. B LARIMER.......................................8 LARIOSCAMP................................ D LARMINE........................... ............ D LAROOUE...................................... B LAROSE......................................... D LAROSS......................................... B LARPENTEUR ............................... B LARRY........................................ CID LARTON......................................... A LARUE............................................ A LARUSH......................................... B LAR V I E..................... -- ....... ........... D LA R W 00 D..................................... C LAS FLORES .............. --.............. D LAS LUCAS................................... B LAS VEGAS............... ............ ..... ...D LASAC............................................ A LASALLE........................................ D LASAUSES.................................... D LASERE......................................... C LASH.............................................. B LASKA............................................ B LASSEL.......................................... C LASSITER...................................... B LASTANCE......................... -......... B LASVAR...-.................................... C LATAH......-.... .... .......... ................ - D LATAHCO...................................... D LATANI ER ...................................... D LATCH......- .................................... A LATES............................................0 LATEX.......................... ........ ..... .... .0 LATHER ......................................... D LATI ERRA...................................... B LATIGO.......................................... B LATI MER........................................ D LATINA................................ ......... - D LATIUM.......................................... D LATONIA........................................ B LATOUCHE............................ .... _.. D LATOUR.......................................- B LATOURELL.................................. B LATRASS_.........- .............. ......... D LATTAS............... ................ ......... - D LAUBY............................................ B LAUDERDALE ............................... D LAUDERHILL ............................. BID LAUER....... - ............................... CID LAUGENOUR.............. ......... ..... ....0 LAURAMIE..................................... B LAUREL ...- .................................... D LAURELWOOD .......... .......... - ... -... 8 LAUREN.............. ............... --........ B LAVALLEE..................................... B LAVEAGA....................................... C LAVELLGA..................................... B LAVENDER. - ................. - ..... .... B LAVENTANA.................................. C LAVEY............................................ D LAVINA... ................... ......... - ... ....... D LAVODNAS............... - ........ ........... C LAWAI............................................ B LAWEN... ....................... ...............-B LAWN DALE ...- .............................. B LAWNES........................................D LAWNWOOD ............................. BID LA W RENCE... .._....... ....... -........... C LAWRENCEVILLE ......................... C LAWSON........................................ C LAWVER........................................ B LAX................................................. C LAXTON......................................... C LAYCOCK...................................... B LAYTON...-.................................... B LAZAN............................................ D LAZBUDDIE................................... D LEBAR ..... ........ ....... -- .... - ... ..... -... B LEA. ............. ............ ........... C LEADER......................................... B LEAOORE...................................... B LEADPOINT................................... C LEADVALE..................................... C LEAF............................................... D LEAFLAKE..................................... B LEAGUE ......................................... D LEAGUEVILLE ............. .... - .... .. BID LEAKEY......................................... D LEAKSVILLE............. ........ _-......... D LEANDER...................................... B LEANNA......................................... D LEATHAM......................................0 LEATHERBARK ...... ........... .......... -C LEATHERS .............................. -.... 8 LEATHERWOOD ........................... B LEAVENWORTH ............... ............ C LEBAM........................................... B LEBEAU....... ........... - ........... .......... D LEBEC............................................ B LEBRON......................................... D LECKMAN...................................... B LECOMA........................................ B LECRAG......................................... D LEDFORD... ........... -...................... B LEDGER ................... ......... - ........ ... D LEDOW.......................................... B LEDRU........................................... D LEDWITH............... - ......... ......... BID LEECREEK.................................... D LEEDSVILLE.......... .......... - .... .... .... B LEEFIELD.................................. .... C (210-VI-TR-55, Second Ed., June 1086) A-21 NCDENR North Carolina Department of Environment and Natural Resources Division of Water Quality Beverly Eaves Perdue Governor June 29, 2009 Coleen H. Sullins Director Mr. Thomas B. Morris, Senior Vice President First Citizens Bank and Trust Company PO Box 27131 Raleigh, NC 27611 Subject: Request for Additional Information Stormwater Project No. SW8 080744 First Citizens Bank Brunswick County Dear Mr. Morris: Dee Freeman Secretary The Wilmington Regional Office received a modified State Stormwater Management Permit Application for the First Citizens Bank on February 19, 2009 with additional information received on April 28, 2009. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: 1. Plan sheets C5, and C10 illustrate that the three (3) additional Stormtech chambers required to treat the additional BUA are not connected to the inlet manifold. A site inspection on April 8, 2009 confirmed that these chambers have already been installed without the prior approval of DWQ. After reviewing the additional information received on April 28, 2009 and subsequent discussions within DWQ, it was decided that this additional row of Stormtech chambers is required to be connected to the manifold for maintenance and accessibility. Please extend the manifold to connect these additional Stormtech Chambers to the rest of the stormwater system. If the manifold is not extended to the additional row, a Notice of Violation will be issued for modifying the permitted stormwater system without prior approval. The following is not a requirement for approving the proposed modification, but is strongly recommended: 2. The site is draining to SA/HQW waters, an important resource to the coastal communities. The stormwater system, as permitted, appears to be designed to act more like an underground dry detention pond instead of an infiltration trench. This system appears to have been approved with an outlet device (including an orifice) that will assist in the draw down of the required storage volume. Infiltration systems should be designed to store the required volume for infiltration into the soil with the only outlet being an overflow weir to bypass the excess runoff. The Division is asking you to consider helping in our mission to preserve, protect, and enhance water quality by plugging the 3.5"x19" rectangular orifice in the outlet structure. These actions will help to fully utilize the infiltration system as intended by infiltrating stormwater runoff and reducing the runoff directly reaching surface waters. If these actions are to be completed, please update the plans to reflect the changes (including plan sheet C12). Wilmington Regional Office 127 Cardinal Drive Extension, Wilmington, North Carolina 28405 Phone: 910-796-72151 FAX: 910350-20041 Customer Service. 1-877-623-6748 Internet:v .ncwauuquality.org NorthCarolina Naturally An Equal Opportunity 1 Affirmative Action Employer L Thomas B. Morris June 29, 2009 Stormwater Application No. SW8 080744 Please note that this request for additional information is in response to a preliminary review. The requested information should be received in this Office prior to July 30, 2009, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail, email or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not acceptable. If you have any questions concerning this matter please feel free to call me at (910) 796-7215 or email me at christine.nelson@ncmail.net. Sincerely, l� (y_ (W Christine Nelson Environmental Engineer GDS/can: S:\WQS\STORMWATER\ADDINFO\2009\080744�09 cc: Peter A Bishop, Kimley — Horn and Associates, Inc. Christine Nelson Wilmington Regional Office Page 2 of 2 Nelson, Christine From: Patterson, Robert Sent: Tuesday, June 23, 2009 8:36 AM To: Nelson, Christine; Johnson, Kelly Subject: RE: infiltration trench questions Well, I guess if it's built like that already... we probably are not going to make them dig it up to connect it to the manifold. I guess you could approve it as built, and note that it will not be allowed again. Or, if you feel like chasing it, make him dig it up since they didn't get it approved before modifying the plans. I think it will fill up, but again, there is no way to access those chambers. Could we enforce on them for not building it per the approved plans so that they won't do this again? Robert D. Patterson, PE Environmental Engineer NCDENR I DWQ I Stormwater Permitting 161.7 Mail Service Center, Raleigh, NC 27699-1617 (Mailing) 512 N. Salisbury St, Raleigh, NC 27604 (Location & Parcels) (919) 807-6375 Phone 1 (919) 807-6494 Fax Email: robert.patterson(u,ncdenr.gov (NOTE NEW EMAIL ADDRESS) Website: http:/Jh2o.etir.state.nc.us/su/stormwater.html *Please consider the environment before printing this email' ?"r Genie.' c9191L3/M ��17\ \V\4A\ mc^�t0�k\ �r \x \h5vq_� G^ N04 E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. From: Nelson, Christine Sent: Tuesday, June 23, 2009 8:07 AM To: Johnson, Kelly; Patterson, Robert Subject: RE: infiltration trench questions The problem is that he built the system with these extra three not connected to the manifold before seeking approval. I forgot to add that. Sorry! I totally agree that he should connect them to the manifold, but he is fairly adamant that its ok and that it's built per the specs of StormTech. Unfortunately the underdrain was previously permitted, so I don't have much say in it From: Johnson, Kelly Sent: Tuesday, June 23, 2009 7:24 AM To: Patterson, Robert; Nelson, Christine Subject: RE: infiltration trench questions Is there some good reason why he can't connect them? It doesn't look like it would be that difficult? From: Patterson, Robert Sent: Tuesday, June 23, 2009 7:03 AM To: Nelson, Christine; Johnson, Kelly Subject: RE: infiltration trench questions I believe that those 3 chambers would fill up not being connected, but I think they should still connect to the manifold. There's no "access" to those 3 chambers otherwise. Is it really that hard to extend the manifold a few feet? What's that underdrain doing in an infiltration system? Robert D. Patterson, PE Environmental Engineer NCDENR I DWQ I Stormwater Permitting 1617 Mail Service Center, Raleigh, NC 27699-1617 (Mailing) 512 N. Salisbury St, Raleigh, NC 27604 (Location & Parcels) (919) 807-6375 Phone 1 (919) 807-6494 Fax Email: robert.patterson(lncderingov (NOTE NEW EMAIL ADDRESS) Website: httn://h2o.enr.state.nc.us/su/stormwater.html 'Please consider the environment before printing this email' E-mail correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties From: Nelson, Christine Sent: Monday, June 22, 2009 4:15 PM To: Patterson, Robert; Johnson, Kelly Subject: infiltration trench questions Robert & Kelly, I have a consultant who's designed an infiltration trench system with the help of Stormtech. They are modifying a previously permitted system to add 3 chambers. The problem is that this extra row of chambers does not include a manifold to allow the stormwater to directly enter that row. (see the attached file StormTech3) In my request for additional information, I asked them to extend the manifold to connect these additional chambers to the rest of the system. They claim that the chambers will fill up on their own and do not need to be connected to the manifold. They have submitted some paperwork to support this claim. (attached files: StormTechl and StormTect2) I'm sorry for the quality of these files, our normal Admin Assistant is out today. Have you seen this proposed before? Do you agree that it does not need to be connected to the manifold? Any advice would be helpful! Thanks, Christine Please note my e-mail address has changed to: christine.nelson@ncdenr.eov Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. KimleyHorn and Associates, Inc. April 27, 2009 Ms. Christine Nelson North Carolina Dept. of Environment and Natural Resources Division of Water Quality 127 Cardinal Drive Ext. Wilmington, NC 28405 Re: First Citizens Bauk Stonnwater Project No. SW8080744 Dear Ms. Nelson: In response to your comments issued on 4/16/09, KI IA has provided the following information. I. A letter from Slorratech with supporting calculalions that illustrates how stormwater is conveyed through the open graded stone into the respective chambers. 2. Sheet C12 has been revised to show Clue location of the underdraias connecting the outlet control structure. Ifyou need any additional information or have any questions or comments, feel Free to coutactme directly at 919-653-2990. Very truly yours, KIMLL'Y-HORN AND ASSOCIATES, INC. C� I/y D -V /+ John D. Kuzeuski, P.B. Enclosures: Two (2) copies of revised sheet C 12 One (1) Slormtech Letter Cc: Tom Morris, I'CI3 File ■ TEL 919 677 2000 FAX 919 677 2050 APR 2 8 2009 WA ■ P.O. Box 33068 Raleigh, North Carolina 276363068 APR 2 8 2009 BY: Interoffice Memo To: File Cc: 6 St®rmTech- 0.: aw-Fwnlu,—RcA?rga Subsurface Stormwater Managernenl" Pages:1 From: David J. Mailhot, PE Date: August 24, 2005 Subject: Using the Darcy Equation to Estimate Flow Through Open Graded Stone The Darcy Equation: Q = k i A Where: k = permeability coefficient i = hydraulic gradient A = flow area "k" values Where: k = permeability of the media (stone) AASHTO M43 Effective Darcy "k" values' Stone Description Size Number Channel dial ft/day ft/sec 1" to 1 '/2" #3 0.2 140,000 1.6 ft/sec /Z" to 1" #357, 4, 467,5 0.11, 50,000 0.6 ft/sec #4 to 3/8" #56, 57 0.03" 8,000 0.1 ft/sec "i" values: i = Oh / L Where: Ah = head L = flow length through media For flow between chambers Lm;n=15". Measure "L" midway through flow area assuming a gradual change in direction and use L=41" "A" value: Where: A is the area perpendicular to the flow direction. For flow under chambers with 6" depth of bedding stone, use A = 0.5 ft2/ft x 7.12 ft/chamber. Or A = 3.56 ft2 / chamber. Flow estimate: Qchamber direction =k A •� c ram �r one For k=0.6 .�� jifs- � � � = 0.6 ft/sec (30in/41 in) 3.56 ft2 1.6 cfs / chamber (one direction) 30 max If k=0.1 ft/sec Q=0.26 cfs =1 41� Velocity estimate: For k=0.6 -III III II' II. III. I!I n--Ill III III`—lll ilI- a --I .IIt III -III III .III —1 III-1 � II IL _III —III III —III —II —III -IIF I- 'I'�, 1 II. -III III, III—IIL,iII-1 - 15"- Velocity (cant) V = 0.6 ft/sec (30in/41 in) V = 0.4 ft/sec If k=0.1 V=0.07 ft/sec Time Estimate T = 41 in (1 ft/12in) / 0.4 ft/sec T=9sec If k=0.1 T=49 sec Summary Points: 1. The maximum allowable head could be based on the top of stone over the chamber since the chamber system design is generally based on the full storage envelope. Hence the hydraulics associated with a maximum water surface elevation at the top of stone is assumed to be acceptable. 2. Our calculations allow 6" of freeboard since we are calling the maximum head at the top of the chamber, not top of stone. 3. Flow through the stone in one direction based on the minimum depth of stone (6") will vary from 0.3 cfs to 4.2 cfs depending on the stone gradation. 4. These calculations support statements in the Section 6.7 of the StormTech Design Manual for "at least 0.5 cfs through the surrounding stone" for a single StormTech chamber. 5. For StormTech design purposes, 0.5 cfs/chamber will be held and the following values used: a. 0.5 cfs / chamber b. 0.25 cfs in one direction c. 3.56 sq ft flow area in one direction d. travel distance between chambers 41" e. Stone Gradation "k" Velocity Travel Time # 3 1.6 ft/sec 1.2 ft/sec 3 sec #357, 4, 467, 5 0.6 ft/sec 0.4 ft/sec 9 sec #56, 57 0.1 ft/sec 0.07 ft/sec 49 sec 1. Seepage, Drainage and Flow Nets, by Harry R. Cedergren, 1989 John Wiley & Sons. NCDENR North Carolina Department of Environment and Natural Resources Beverly Eaves Perdue Governor April 16, 2009 Division of Water Quality Colleen H. Sullins Director Mr. Thomas B. Morris, Senior Vice President First Citizens Bank and Trust Company PO Box 27131 Raleigh, NC 27611 Subject: Request for Additional Information Stormwater Project No. Still 080744 First Citizens Bank Brunswick County Dear Mr. Morris: Dee Freeman Secretary The Wilmington Regional Office received a modified State Stormwater Management Permit Application for the First Citizens Bank on February 19, 2009. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: 1. The proposed three (3) additional Stormtech Chambers on plan sheets C5, and C10 are not connected to the inlet manifold. Please extend the manifold to connect these additional Stormtech Chambers. 2. Please include the underdrains on the outlet structure detail on plan sheet C12 to demonstrate how these pipes outlet from the infiltration trench system. The following is not a requirement for approving the proposed modification: The site is draining to SA/HQW waters, an important resource to the coastal communities. The stormwater system, as permitted, appears to be designed to act more like an underground dry detention pond instead of an infiltration trench. This system appears to have been approved with an outlet device (including underdrains and an orifice) that will assist in the draw down of the required storage volume. Infiltration systems should be designed to store the required volume for infiltration into the soil with the only outlet being an overflow weir to bypass the excess runoff. The Division is asking you to consider helping in our mission to preserve, protect, and enhance water quality by: a. plugging the orifice in the outlet structure. b. capping the underdrains if they discharge to the outlet structure beyond the weir wall. The capped underdrains can be utilized for future maintenance activities (refer to Section 16.3.8 of the NC BMP manual). These actions will help to fully utilize the infiltration system as intended by infiltrating stormwater runoff and reducing the runoff directly reaching surface waters. If these actions are to be completed, please update the plans to reflect the changes (including plan sheet C12). Please note that this request for additional information is in response to a preliminary review. The requested information should be received in this Office prior to May 17, 2009, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. Wilmington Regional Office 121 Cardinal Drive Extension, Wilmington, North Carolina 28405 One \ Phone: 910.796-72151 FAX: 910-350.20041 Customer Service:l-877-623-6748 - NOiftlCcir01111a Internet: www ricivaterquality,org Naturally \ aabural y An Equal OpportunitylAffirmative Action Employer Thomas B. Morris April 16, 2009 Stormwater Application No. SW8 080744 If you need additional time to submit the information, please mail, email or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on all correspondence. Any original documents that need to be revised have been sent to the engineer or agent. All original documents must be returned or new originals must be provided. Copies are not acceptable. If you have any questions concerning this matter please feel free to call me at (910) 796-7215 or email me at christine.nelson@ncmail.net. Sincerely, C.�qwDe, Christine Nelson Environmental Engineer GDS/can: S:\WQS\STORMWATER\ADDINFO\2009\080744.apr09 cc: Peter A Bishop, Kimley — Horn and Associates, Inc. Christine Nelson Wilmington Regional Office Page 2 of 2 w NCDENR North Carolina Department of Environment and Natural Resources Beverly Eaves Perdue Governor April 16, 2009 Division of Water Quality Coleen H. Sullins Director Mr. Thomas B. Morris, Senior Vice President First Citizens Bank and Trust Company PO Box 27131 Raleigh, NC 27611 Subject: NOTICE OF INSPECTION First Citizens Bank Permit No. SW8 080744 Brunswick County Dear Mr. Morris: Dee Freeman Secretary On April 8, 2009, Christine Nelson of the Wilmington Regional Office of the Division of Water Quality (DWQ) inspected the First Citizens Bank in Brunswick County to determine compliance with Stormwater Management Permit Number SW8 080744 issued on August 21, 2008. DWQ file review and site inspection revealed that the site is compliant with the terms and conditions of this permit. Please find a copy of the completed form entitled "Compliance Inspection Report" attached to this letter. Please be advised that you are required to comply with the terms, conditions and limitations of your Stormwater Management Permit under Title 15A North Carolina Administrative Code 2H .1003 and North Carolina General Statute 143-214.7, including operation and maintenance of your permitted stormwater system. If the project has changed name, ownership or mailing address, a formal change of name/ownership form must be submitted to DWQ within 30 calendar days detailing the change. Please provide the name, mailing address and phone number of the person or entity that is now responsible for this permit. Please be advised that violations of your Stormwater Management Permit may be subject to the assessment of civil penalties of up to $25,000 per day per violation. If you have any questions please contact Christine Nelson at the Wilmington Regional Office, telephone number (910)- 796- 7215. SincQereelly, ? Christine Nelson Environmental Engineer Enclosure: Compliance Inspection Report GDS\can: S:\WQS\STORMWATER\INSPECT\080744.apr09 cc: John Hennessy-NPS-ACOU Christine Nelson WiRO Files Wilmington Regional Office 127 Cardinal Drive Extension, Wilmington, North Carolina 28405 One Phone: 910-796-7215 \ FAX: 910-350-2004 \ Customer Service: 1-877-623-6748 North Ca T oli na Internet: www,ncwaterquality.org Naturally An Equal Opponunity l Affirmative Action Employer Compliance Inspection Report Permit: SW8080744 Effective: 08/21/08 Expiration: 08/21/18 Owner: First Citizens Bank and Trust Company Project: First Citizens Bank County: Brunswick 8900 E Oak Is Dr Region: Wilmington Oak Island NC 28465 Contact Person: Thomas B Morris Title: Phone: 910-716-4130 Directions to Project: Project is located in the NE corner of the intersection of East Oak Island Dr. & McGlamery Street in the town of Oak Island. Type of Project: State Slormwater - Infiltration System Drain Areas: 1 - On -Site Representative(s): Related Permits: Inspection Date: 04/0812009 Entry Time: 10:00 AM Primary Inspector: Christine Nelson Secondary Inspector(s): Reason for Inspection: Other Permit Inspection Type: State Stormwaler Facility Status: ❑ Compliant ❑ Not Compliant Question Areas: ® State Slormwater (See attachment summary) Exit Time: 10:30 AM Phone:910-796-7215 Inspection Type: Stormwater Page: 1 Permit: SW8080744 Owner - Project: First Citizens Bank and Trust Company , Inspection Date: 04/08/2009 Inspection Type: Stormwater Reason for Visit: Other Inspection Summary: Site is still under construction but the infiltration trench system has been installed. Construction superintendent did indicate that the extra three (3) stormtech chambers proposed with the permit modification have already been installed. File Revipw Is the permit active? Signed copy of the Engineers certification is in the file? Signed copy of the Operation & Maintenance Agreement is in the file? Copy of the recorded deed restrictions is in the file? Comment: Site still under construction. SW Measures Are the SW measures constructed as per the approved plans? Are the inlets located per the approved plans? Are the outlet structures located per the approved plans? Comment: Infiltration trench already constructed and under packed gravel. Operation and Maintenance Are the SW measures being maintained and operated as per the permit requirements? Yes No NA NE ® ❑ ❑ ❑ nE00 Is❑❑❑ ❑ ❑ ® ❑ Yes No NA NE ❑ ❑ ❑ ®❑ ❑ ❑ ® ❑ ❑ ❑ Yes No NA NE ®❑ ❑ ❑ Are the SW BMP inspection and maintenance records complete and available for review or provided to DWO ❑ ❑ ❑ upon request? Comment: Page: 2 RE: FW: status of construction for First Citizens Bank in Oak Island? I . Subject: RE,: FW: status of construction for First Citizens Bank in Oak Island? From: <John.Kuzenski n kimley-horn.com> Date: Mon, 6 Apr 2009 17:07:37 -0400 To: <Christine.Nelson a ncmail.net> CC: <Feter.Bishop@kimley-hom.com> Christine, The 14.70 elevation is the 1 year 24 hour storm water surface elevation. This orifice will allow some runoff to leave the system during .larger rain events, but the system is designed to not exceed pre -development flow rates for the 1 year and 10 year 24 hour storm events. The Town of Oak Island requires pre/post detention of the 1 year and 10 year 24 hour storm events. The outlet structure configuration was designed to meet the detention requirements of the Town. This rationale is explained in tabular format in Appendix C and Appendix E of the Stormwater Analysis report. O The Stormtech system is designed for both water quality and quantity and the calculated size of the system is governed by the most restrictive requirement. In this case, the required water quality volume exceeded the volume required for detention; therefore the system was enlarged to accommodate the water quality requirements while still meeting the required pre/post detention criteria. Hope this explanation helps. Feel free to call with questions. Thanks, John Kuzenski, P.E. Kimley-Horn & Associates, Inc. 3001 Weston Parkway Cary, NC 27513 Phone: 919-653-2990 Fax: 919-677-2050 -----Original Message ----- From: Christine Nelson[mailto:Christine.Nelson@ncmail.net] Sent: Monday, April 06, 2009 4:20 PM To: Kuzenski, John Subject: Re: FW: status of construction for First Citizens Bank in Oak Island? Thanks - I did miss type the location of the project. One more question, why is there a rectangular orifice in the weir wall of the outlet structure at 14.70 ft when the design storm is at 17 ft? Christine enski@kimley-horn.com wrote: tion from my previous email. Town of Oak Island. Thanks, John Kuzenski, P.E. Kimley-Horn & Associates, Inc. 3001 Weston Parkway Cary, NC 27513 Phone: 919-653-2990 Fax: 919-677-2050 I of 2 4/6/2009 5:14 I'M FW: status of construction for First Citizens Bank in Ocean Isle? C5k I5�� Subject:1,W: status of construction for First Citizens Bank irrerearr+,40 From: <John.Kuzcnski@kimley-horn.com> Date: Mon, 6 Apr 2009 14:23:00 -0400 To: <Christine.Nelson cr ncmai1.net> Correction from my previous email. Town of Oak Island. Thanks, John Kuzenski, P.E. Kimley-Horn & Associates, Inc. 3001 Weston Parkway Cary, NC 27513 Phone: 919-653-2990 Fax: 919-677-2050 -----Original Message ----- From: Kuzenski, John Sent: Monday, April 06, 2009 2:19 PM To: 'Christine Nelson' 1 Cc: Bishop, Peter ` c V's S1a^�\- Subject: RE: status of construction for First Citizens Bank in Geeen is e? Christine, The Stormtech System has been installed per the plans. Just to clarify, the project is within the Town of Oaks Island. Feel free to call with questions. Thanks. John Kuzenski, P.E. Kimley-Horn & Associates, Inc. 3001 Weston Parkway Cary, NC 27513 Phone: 919-653-2990 Fax: 919-677-2050 -----Original Message ----- From: Christine Nelson[mailto:Christine.Nelson@ncmail.net] Sent: Monday, April 06, 2009 11:09 AM .0 To: Kuzenski, John Subject: status of construction for First Citizens Bank ins John, Thank you for answering my questions regarding the proposed modification to First Citizens Bank in �-.... Can you provide the status of construction for the infiltration trench? Da4 5y�µ a Thanks, Christine Email correspondence to and from this address may be subject to the North Carolina Public Records Law and may be disclosed to third parties. I of 1 4/6/2009 2:45 PM First C;tizens Bank -Oak Island NC-NCDWQ Inquiry Subject: First Citizens Bank -Oak Island NC-NCDWQ Inquiry From: <Jolw.Kuzenski@kimley-horn.com> Date: Fri, 27 Feb 2009 14:07:11 -0500 To: <christine.nelson@ncmail.net> CC: <Peter.Bishop@kimley-horn.com>, <michael.peck@kimley-horn.com> Christine, Per our conversation this morning I am providing you with some additional information to assist you in finalizing Your completeness review. The three items you requested are listed below: Revised Narrative: The owner requested that additional parking be added to the site plan adjacent to the proposed building for staff parking. This revision has been approved by the Town of Oak Island and is shown on the current civil construction plans. The net increase of impervious area added to the site was 0.04 acres. As a result, three additional Stormtech Chambers were added to the existing system to meet the appropriate water quality and quantity requirements for this project. These minor changes are addressed in this revision submittal to amend the previously approved Stormwater Permit issued by NCDWQ on 8/21/09. Status of Construction: The latest available site visit report that describes the improvements already constructed on site have been included in this report. Drainage Area Calculation: The pre and post development drainage areas are based on the area of the site parcel. The project was previously approved by NCDWQ using this assumption. John Kuzenski, P.E. Kimley-Horn & Associates, Inc. 3001 Weston Parkway Cary, NC 27513 Phone: 919-653-2990 Fax: 919-677-2050 Content -Description: Oak Island 12.30.08 Site Visit Report.pdf Oak Island 12.30.08 Site Visit Report.pdf Content -Type: application/pdf Content -Encoding: base64 l of 1 2/27/2009 2:20 PM SITE VISIT REPORT December 30, 2008 First Citizens Bank — Oak Island 8900 E. Oak Island Drive Oak Island, NC Project #080657 Rain Studi Arehireemre ■ C:onstmedon Administration a Lender Review Service Time: 2:00 PM Workmen: SUPERINTENDENT: + 1 Temperature: +600 GC ±1 Weather: Sunny EC: + 2 PC: + 0 MC: + 0 UTILITY: +3 Present: Mike Hawley, Superintendent Denver Construction Company (DENVER) Jim Rains, AIA Rains Studio, PA (RSPA) The following items were observed and discussed: SITE: Work In Proaress During Visit 1. Installation of underground electrical service to building and site lighting 2. Setting of electrical transformer SITE: Work In Place or Previously Underway 1. Back filling of curb with topsoil 2. Underground rough in of utility services BUILDING: Work in Proaress During Visit 1. Installation of anchor bolts at perimeter of stud walls 2. Slab preparation for future installation "of built on site vault" Post Office Box 308 1510 Main Street, Suite D Ramseur, NC 27316 Office: 336.824.8990 Fax: 336,824.8217 Mobile: 336.963.0003 (Jim) Mobile: 910.638.5649 (Dennis) w .rainsstudio.com Page 1 of 2 BUILDING: Work In Place or Previously Underway 1. Installation of perimeter wall metal studs 2. Installation of roof trusses 3. Installation of roof sheathing 4. Installation of ice and water shields at roof sheathing 5. Installation of foil face batt insulation at the trusses OBSERVATIONS: 1. The drive-thru roof trusses which had been previously installed have been removed and stored on site (see photographs) 2. During the visit lengthy discussion was held with Mike Hawley, Superintendent, concerning the future modifications to the exterior of the building. Mike is awaiting revised drawings to direct further work and rework to the structure 3. The project schedule has been delayed due to building modifications taking place. It appears that as much as a 30 day delay has occurred due to rework and lack of possible productive work while design modifications are being considered 4. All work that is possible to be underway has been undertaken by Denver Construction where possible. (For example installation of underground utilities, back filling of curb, etc.). STORED MATERIAL ON SITE: 1. Metal studs 2. Framing lumber 3. DensGlass sheathing 4. Storm drainage piping 5. Sheet rock END OF REPORT REPORT BY: Jim Rains, AIA ATTACHMENTS: Photographs Cc: Wayne Raynor, First Citizens Bank Michael Parker, AIA, First Citizens Bank Faye Barwick, First Citizens Bank Shane Webster, Small Kane Architects Peter Bishop, Kimley-Horn and Associates Chris Crow, Morrison Engineers David Bell, Adcock Engineering Hal Martin, Adcock Engineering Kenneth Tucker, Denver Construction Company Mark Elmore, Denver Construction Company Mike Turner, BranchSery John Whitaker, BranchSery Damon Brock, Brock Contract Service Wayne Burton, Burton Electric Signs John Sartori, Diversified Systems Ladd Nelson, Ladd Architectural Wall Systems Randolph Ford, Pridgen Woodworks David Wells, Security Erectors Stan Sieder, Spaulding Craft Rob Burlington, SteelFab of Virginia Scott Arena, Stock Building Supply Stuart Walston, Stuart Walston, Inc. Dennis Brown, PE, Rains Studio Jim Rains, AIA, Rains Studio Page 2 of 2 Oak Island 12.30.08 SVR Oak Island Oak Island 12.30.08 -Pictures' > fifty( 01 Underground r A3 Metal $tuQ$ Q?L .Vault Slab Electrical Installed i oa Metal Snuffs Rework Installed 05 Exterior 06 Trusses Removed j 07 Topsoil/Curb View From Drive-thru I Backfill 08 Drive-thru _41 View Al 09 Electrical IO.Stured.Studs Underground Ll Insulation/ -Foil- On Site Face histallcd 12 Stored Shu.-t s Rack it Y L ' 'f i 13 Front Wevntion 14 "I'ransformcr — - -- Installation in Progress - ' 15 Rear Entry Road- I ti-Overall View 0 17 Utitity Vault- i Project Name: /l5 i /:. > I Ramiewer: C_ A/ Date://1/o/0 ect Received Date: 2-- I Project Location: (iD. ' I Add info reouired(i6es/iiho). Date received: a/a7/b? I Rule(s) Subject (check all that Symbols for completing form: '✓'= Yes/OK ' x'= No/Deficient 'n/a' or T or'/' app�ly)�•• / El1995 Coastal L 2008 Coastal ur Phase II ❑ Universal 7 Check for $505 (must be no older than 6 months) Application form with correct/original signatures (original plus 1 copy). If Corporation or LLC also: o Print the info from the NCSOS o Either, 1.) The applicant is listed on the NCSOS with his/her correct title or, 2.) A notarized letter of \e`X�/ authorization has been provided: tt� p supplements (1 original per BMP). BMP type(s): n3Ab," ijrh �fQv�('� O&M with correct/original signatures (1 original per BMP, except level spreaders/filter strips and swales) °'O�Deed restrictions (if outparcel or subdividing) (original plus 1 copy) o Deed restriction template (signed and notarized) or o Proposed Declaration of Covenants and Restrictions (signed and notarized) Soils report identifying the SHWT � upporting calculations, signed & sealed (if necessary) Receiving stream classification: -'5q , If SA or ORW also: o SA: USGS topo map with the site, the receiving waters and the''/2 mile radius shown to scale. o ORW: 575 it of MHWL for Area of Environmental Concern and max BUA per rule. N1Qy Modifications: 1.) If built: Designer's Cert., 2.) If partially built: Partial Cert., 3.) If not built: No Cert. needed. Development Type (check all that apply):/ ❑ Residential or ®commercial ❑ Deed restrictions match? ❑ Subdivision or Single Lot ❑ Deed restrictions match? Ll✓High Density or ❑ Low Density / ❑ Deed restrictions match? ❑ Offsite project ❑ Redevelopment Q" Modification ❑ Exempt ❑ NCG02 (bulkhead) ❑ NCG03 (clear/grade) ❑ NCG04 (linear) Densi : BUA calculations include common areas, clubhouse, sidewalks, etc. 1PUA W ii3 Matches high/low density requirement for rule and receiving stream class. 1 No obvious math errors CJ If High Density: Design storm correct for rule and receiving stream class. Plans,ygned and sealed (2 sets): U- Two sets received 4d' Layout (with proposed BUA dimensions) Grading ❑ Drainage area map (all HD system�.& curb outlet swales) t7fY(11 0 c rQ� E1" Vicinity map ZProject Boundaries Legend 1 ❑ Wetlands: 0o Delineated on plans o "No wetlands onsite" on plans •Details: o Roads o Cul-de-sacs o Curbing o Sidewalk o BMPs/ Level spreaders/ Filter strips/ Curb outlet swales o Buildings (Apts or Condos) Off ite Projects: ❑ Designer's Certification has been submitted for the Offsite BMP receiving the runoff from the project. ❑ Deed restrictions have been recorded and a copy submitted for the Offsite BMP permit. Lot size has not changed from what was approved under the Master Plan. Correct lot number is referenced on the supplement form. Offsite system is in compliance with its permit, if known. Infiltrati9n Projects: �w (Q �i Soils report: SHWT, soil type, and expected infiltration rate are provided. �,f k-JNw`'\")( Ef DWQ has conducted a site visit? Date: U Wet Ponds: Permanent Pool Meets One of the Following: Is located no lower than 6" below the estimated SHWT. Incoming groundwater is quantified and evaluated, AND Storage volume verified, AND Outlet evaluated for free drainage to the receiving waters under SHWT conditions. Decision (check one): ❑ Complete: Return file to admin (Jo Casmer) to log in. (Stamped in received date = BIMS date) l Slightly incomplete: E-mail consultant, request information to be returned within one business day (24 hours after request. Info requests on Friday, allow a return on the following business day). If info not returned, issue an application return letter and give everything to admin. (Add info received date = BIMS date) ❑ Substantially incomplete: Issue an application return letter and give everything to admin. X 3 we L1 0 s WKI s X X q5 ®M" Kimley-Horn ® and Associates, Inc. February 17, 2009 NCDENR Division of Water Quality Wilmington Regional Office 127 Cardinal Drive Extension Wilmington, NC 28405 Subject: First Citizens Bank 8900 East Oak Island Drive �0 Oak Island, NC 28465 Our Ref. 011737152 Permit Reviewer: Kimley-Horn and Associates is submitting a Stormmater Management permit Application Modification package for your review. The following items have been included in this submission: ■ P.O. Box 33068 Raleigh, North Carolina 2763036E • One (1) original and one (1) copy of Stormwater Management Permit Application Form. • One (l) Infiltration "Drench Supplement. • One (1) signed and notarized Operation and Maintenance Agreement. *cope q% original provided — original on file as part oforiginal permit application (no change to Operation and Maintenance Agreement) • Two (2) sets of Construction Plans. • Two (2) copies of Stormwater Analysis Report. • One (1) copy of Gcotechnical Report by Soil & Environmental Consultants. • One (1) copy of Geotechnical Report by Geo7-echnologies, Inc. • One (1) check lot- Permit Review Fee (check 4002071449, $505.00) If you need any additional information or have any questions or comments, feel free to call me directly at 919-653-2990. Very truly yours, KIMLEY-I-TORN AND ASSOCIATES, INC. .lobo Kuzcnski, P.E. FEB 1 9 2009 cc. — Tom Morris, FCB File BY. 0 TEL 919 677 2000 FAX 919 677 2050 O c) A O =Fi Z m A ^O N W C U O A � rl z N D r r m 0 I � it n V 1 n O_m N mA < o A> D I -S m0 r I < r*1 Z �U :EOm Z-0 fnZO O G N r 0 2 N A U J A WwV U° mz O O C m m N C) O N A 0 O A � O � Z O O < Z n� OZrn IIZ Z K Z Z DAB A 0 -0 W U _C oi-O ran rl OOiO-1O J A rno-+o <g ,qv II ➢ O O S r 1. z' ) i D N ZO _A < O 09 U C T U1 :E n 0) J O X O ? fr U! _� �' CJ r O 0 t0 C X Om AZ ➢ m A mn A D m A A > D n m z c r D A ®O❑ FIRST CITIZENS BANK FIGURE CONTROL STRUCTURE Kimsey -Horn and Associates, Inc. OAK ISLAND, NC X1 THIS DOCUMENT, TOGETHER WITH THE CONCEPTS AND DESIGNS PRESENTED HEREIN, AS AN INSTRUMENT OF SERVICE, IS INTENDED ONLY FOR THE PURPOSE AND CLIENT FOR WHICH IT WAS PREPARED. REUSE OF AND IMPROPER RELIANCE ON THIS DOCUMENT WITHOUT WRITTEN AUTHORIZATION AND ADAPTATION BY KIMLEY-HORN AND ASSOCIATES, INC. SHALL BE WITHOUT LIABILITY TO KIMLEY-HORN AND ASSOCIATES, INC. i _-----PRICE STREEr_60' RZW _---- Oury S aS08'39' E ..���.ne........... r, _ _ _ 105I00' � _ s + �o 'I 1 1 esos''-s'w 1 Z 1 ,GA _ I V 6' r E9 I 1 I 5 5j f `"^ 7 .Etlx 1 3 13'rr:.v __� >BN IeaE _ i� ^ — — — — _ i IDun® i N 60S 39' W W IMP _____ FAsr Oac MMD DRIVE eD / — 1 , 1 �I I ®®® Kimley-Horn ® and Associates, Inc. PA BOX =ft- RV.BOR 14101711 QWCLM 9W"M FIRST CITIZENS BANK PRE -DEVELOPMENT DRAINAGE MAP dub-KLN = -In DRAINAGE AREA: 1.32 ACRES IMPERVIOUS AREA: 0.38 ACRES PERVIOUS AREA: 0.94 ACRES SOIL TYPE: KUREB (KrB) TYPE 'A' CURVE NUMBER: 56 TIME OF CONCENTRATION: 5 MIN. PRELIMINARY NOT FOR CONSTRUCTION OAK ISLAND NORTH CAROLINA 11 1 t : r Ig Yau on ''• j ,, ' ' Z : ' • i 3 . } : l •• Golf Course f Se pf 1 w� 1 1 t t 9• W t Name: SOUTHPORT Location: 033. 54' 27.7" N 078° 04' 24.5" W Date: 5/6/2008 Caption: First Citizens Bank t Scale: 1 inch equals 1333 feet Intersection of East Oak Island Drive and McGlamery Street Soil Map -Brunswick County, North Carolina C7 N Meters A e 10 p Feel 0 15 A 180 Z70 USDA Natural Resources Web Soil Survey 2.0 5I512008 M Conservation Service National Cooperative Soil Survey Page 1 of 3 see 2 28C ::01. -cep Oa 50' 60 000 rE•_ ,ZONE, A'E� '111.. r- •.'7F.0 3756 " M 37'54'30•� �•�� ZONE AE El •4. ZONE - s IF ,.. . .1d 771 0p° & GRID NORTH SCALE 1e - 500, (1 6,000) 0 500 1000 _ _ = FEET ° PANEL 20M QQ FIRM - -T FLOOD INSURANCE RATE MAP CNORTH CAROLINA 3 PANEL 2085 l fl rl IWE LC ToR NXX FM nRM —.1 rw1F1 uv Tl c� C WAM LVtfJigPlfY m W PNB SLWM rarai avarw.N a aLa a nu iauo rorar a aa+ a U .4n /biy Irp aOaY. 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