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HomeMy WebLinkAboutSW8990923_Historical File_20070703• .�,O" A O:� G July 3, 2007 Dr. Eric McKeithan, President Trustees of Cape Fear Community College 411 South Front Street Wilmington, NC 28401 Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment mid Natural Resources Subject: Permit No. SW8 990923 Modification. Cape FQar Community College -North Campus High Density Stormwater Project New Hanover County Dear Dr. McKeithan: Coleen H. Sullins, Director Division of Water Quality The Wilmington Regional Office received a complete, modified Stormwater Management Permit Application for Cape Fear Community College -North Campus on March 2, 2007. Staff review of the plans and specifications has determined that the project, as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are forwarding Permit No. SW8 990923 Modification dated July 3, 2007, for the construction of Cape Fear Community College -North Campus. This modification adds the Public Safety Training Center to the approved project. This permit shall be effective from the date of issuance until January 28, 2010, (the original expiration date) and shall be subject to the conditions and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within sixty (60) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 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 either Linda Lewis, or me at (910) 796-7215. Sin�c9 Edward Beck Regional Supervisor Surface Water Protection Section ENB/arl: S:IWQSISTORMWATERIPERMIT1990923mod.ju107 cc: Steven Leimer, P.E., WK Dickson Tony Roberts, New Hanover County Building inspections Beth E. Wetherill, New Hanover County Engineering Linda Lewis Wilmington Regional Office Central Files NAB Carolina Natun"I'V North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone (910) 796-7215 Wilmington Regional Office Internet: www.ncwaterquality.ore Fax (910) 350-2004 An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper Customer Service F 1-877-623-6748 State Stormwater Management Systems Permit No. SW8 990923 Modification STATE OF NORTH CAROLINA DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES DIVISION OF WATER QUALITY STATE STORMWATER MANAGEMENT PERMIT HIGH DENSITY DEVELOPMENT In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North Carolina as amended, and other applicable Laws, Rules, and Regulations PERMISSION IS HEREBY GRANTED TO Trustees of Cape Fear Community College Cape Fear Community College -North Campus 4500 Blue Clay Road, Wilmington, New Hanover County FOR THE construction, operation and maintenance of four (4) wet detention ponds in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rulesand 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 January 28, 2010 and shall be subject to the following specified conditions and limitations: I. DESIGN STANDARDS 1. This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. 2. This stormwater system has been approved for the management of stormwater runoff as described in Section 1.6 on page 3 of this permit. The stormwater controls designated as Ponds 1, 3, 3, and 4 h ve been desiggned to handle tie runoff from a total of 1,268,467 ft , 280,526 ft, 1,219,680 ft`, and 536,037 ft`, respectively, of built -upon area. 3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit. 4. The built -upon area within each pond's drainage area will be limited to the amount of built -upon area indicated in Section 1.6 of this permit, the approved plans and application. 5. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. Page 2 of 7 State Stormwater Management Systems Permit No. SW8 990923 Modification 6. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. a. Drainage Area, acres: Onsite: Offsite: b. Impervious Sur�aces, ft2: Building ft Street,: Parking, ft2: 2 Sidewalk, ft Tennis Court, ft2: Future Area, ft2: c. Pond Depth, feet: d. Permanent Pool El v., FMSL e. PP Surface Area, f 3 f. Storage Volume Provided, ft g. Storage Elevation, FMSL: h. Controlling Orifice Pipes: 3 i. Permanent Pool Volume, ft j. Maximum Fountain HP: k. Forebay Volume, ft3: I. Receiving Stream: m. Index Number: n. Classification : II. SCHEDULE OF COMPLIANCE Pond 1 Pond 2 Pond 3 Pond 4 41.60 9.20 40.00 14.48 41.60 9.20 40.0 14.48 0 0 0 0 1,268,467 280,526 1,219,680 536,037 31,363 0 117,176 25,265 11,761 23,958 74,488 13,939 91,040 57,500 526,640 361,112 22,216 0 120,226 871 0 0 46,174 0 1,112,087 199,068 334,976 102,790 6.00 5.00 5.50 4.50 27.50 25.00 25.00 27.50 96,948 31,061 78,605 43,456 104,272 25,661 99,805 46,300 28.55 25.80 26.20 28.50 3 @3.0"cp 1 @2.0"cp 2 @3.0"cp 3.0"cp 515,398 100,021 260,854 142,780 2 Y3 1 1�2 105,041 20,404 59,461 29,250 Prince George Creek CPF23 (18-74-53) `°C Sw" 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 except roads. 2. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but 11 L limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowing and revegetation of side slopes. d. Immediate repair of eroded areas. e. Maintenance of side slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of outlet structure, orifice device and catch basins and piping. g. Access to the outlet structure must be available at all times. 4. Records of maintenance activities must be kept and made available upon request to authorized personnel of DWQ. The records will indicate the date, activity, name of person performing the work and what actions were taken. Page 3 of 7 State Stormwater Management Systems Permit No. SW8 990923 Modification 5. Decorative spray fountains will be allowed in the stormwater treatment system, subject to the following criteria: a. The fountain draws its water from less than 2' below the permanent pool surface. b. Separated units, where the nozzle, pump and intake are connected by tubing, may be used only if they draw water from the surface in the deepest part of the pond. C. The falling water from the fountain must be centered in the pond, away from the shoreline. d. The maximum horsepower for the fountain's pump is based on the permanent pool volume and is listed in Section 1.60) of this permit. 6. The facilities shall be constructed as shown on the approved plans. This permit shall become voidable unless the facilities are constructed in accordance with the conditions of this permit, the approved plans and specifications, and other supporting data. 7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and prior to operation of this permitted facility, a certification must be received from an appropriate designer for the system installed certifying that the permitted facility has been 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. 8. if the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 9. The following items will require a modification to the permit: a. Any revision to the approved plans, regardless of disturbed acreage or size. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area. e. Further subdivision of the project area. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 1 Q. The Dlrector may determine that other revisions to the projecf.shouid require a modification to the permit. 11. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. 12. Prior to the sale of any portion of the property, an access/maintenance easement to the stormwater facilities shall be granted in favor of the permittee if access to the stormwater facilities will be restricted by the sale of any portion of the property. 13. The permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -upon area. 14. The runoff from all built -upon area within the three specified drainage areas on the project must be directed into the appropriate stormwater control system. Page 4 of 7 State Stormwater Management Systems Permit No. SW8 990923 Modification 15. 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 without notice to and approval by the Director. In the event there is a desire for the facilities to change ownership, or there is a name change of the Permittee, a formal permit request must be submitted to the Division of Water Quality accompanied by a Name/Ownership Change Form signed by both parties involved, and supporting documentation as listed on page 2 of the form. The approval of this request -will be considered on its merits and may or may not be approved. The permittee is responsible for compliance with all permit conditions until such time as the Division approves the transfer. 2. Failure to abide by the conditions and limitations contained in this permit may subject the Permittee to enforcement action by the Division of Water Quality, in accordance with North Carolina General Statute 143-215.6A to 143-215.6C. 3. The issuance 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) which have jurisdiction. 4. In the event that the facilities fail to perform satisfactorily, including the creation of nuisance conditions, the Permittee shall take immediate corrective action, including those as may be required by this Division, such as the construction of additional or replacement stormwater management systems. 5. The permittee grants DENR Staff permission to enter the property for the purpose of inspecting all components of the permitted stormwater management facility. 6. The permit may be modified, revoked and reissued or terminated for cause. The filing of a request for a permit modification, revocation and reissuance or termination does not stay any permit condition. 7. The permittee shall notify the Division in writing of any name, ownership or mailing address changes within 30 days. Permit issued this the 3rd day of July 2007. NO=AROLINA ENVIRONMENTAL MANAGEMENT COMMISSION for Coleen H. Sullins, Director Division of Water Quality By Authority of the Environmental Management Commission Permit Number SW8 990923 Page 5 of 7 Date Received Fee Paid Permit Number State of North Carolina Department of Environmental and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION Applicants name (specify the name of the corporation, individual, etc. who owns the project): Cape Fear Community College (CFCC) 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Dr. Eric McKeithan, President Mailing Address for person listed in Item 2 above: 411 Front Street City: Wilmington State: _. _ _ N.C. _ Zip: 28401-3910_ Telephone Number: (910) 362-7555 FAX: (910) 362-7046 4. Project Name (subdivision, facility, or establishment name — should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): A new Public Safety Training Center 5. Location of Project (street address): 4500 Blue Clay Road City: CFCC North Campus County: New Hanover Directions to project (from nearest major intersection): From Wilmington, take College Rd. (NC132) north to Blue Clay Road. 'Turn right to CFCC entrance. Turn right and follow campus Loop Road to Project site located behind the McKeithan Building. Latitude: 34019' 20" N Longitude: 770 52' 11" W Contact person who can answer questions about the project: Name: Carl Brown Telephone: 910-362-7004 II. PERMIT INFORMATION: of project. 1. Specify whether project is (check one): New Renewal X Modification 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number SW8 990923 and its issue date (if known) 6-18-2004 Form SW-101 Version 3.99 Page 1 of 4 Cape Fear Community College Revised Drainage Areas February 28, 2002 (Revised 12/11/03) Basin Information Drainage Area'1 Drainage Area 2 Drainage Area..3 Receiving Stream Unnamed Trib to Unnamed Trib to Unnamed Trib to Name Prince George Prince George Prince George Creek Creek Creek Receiving Stream C Sw C Sw C Sw Class Drainage Area 41.60 ac 9.20 ac 40.00 ac Existing -0- -0- -0- Impervious. Area Proposed`. 29.12 ac 6.44 ac 28.00-ac Impervious Area 1% Impervious 6 % 6 % 50.8 % Area (Current).. . %o Impervious 70 % 70 % 70 % Area Future Impervious Surface Area Drainage Area 1 Drainage Area 2 Drainage Area 3 On -site Buildings 0.72 ac -0- 2.69 ac On -site Streets 0.27 ac 0.55 ac 1.71 ac On -site Parking 2.09 ac 1.32 ac 12.09 ac On -site Sidewalks 0.51 ac -0- 2.76 ac Tennis Courts.& Walk -0- -0- 1.06 ac Subtotal 3.59 ac 1.87 ac 20.31 ac Other on -site Rest of Site is assumed 70% impervious 25.53 ac 4.57 ac 7.69 ac Off -site -0- -0- -0- Total: 29.12 ac 6.44 ac 28.00 ac RECEIVED DEC 1 1 2003 DWQ 3.•, . Specify the type of project (check one): 6p- ZY-07 Low Density X High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): CAMA Major X Sedimentation/Erosion Control . 404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748 III. PROJECT INFORMATION 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 collected in a closed drainage system and discharged to the forebay of an existing wet bottom detention pond which was designed, permitted, and constructed to accept this flow. 2. Stormwater runoff from this project drains to the Cape Fear River Basin. 3. Total Project Area: 14.48 acres 4. Project Built Upon Area: 12.31 acres, 85% 5. How many drainage areas does the project have? p�t� 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach and additional sheet with the informa n for each area provided in the same format as below. QP 4, Basin Information Drainage Are ftZ Drainage Area 2 Receiving Stream Name Prince George Creek Receiving Stream Class "C SW" Drainage Area 630,632 (K A LG Existing Impervious *Area 32,060 Pro osed Impervious* Area 503,977 1/6 Impervious* Area (Total) 85% Inn envious* Surface Area Drainage Area 1 (ft) Drainage Area 2 On -Site Buildings ** 25,265 On -Site Streets (Area Paving) -309;2= On -Site Parking.13,939 On -Site Sidewalks 871 Other On -Site (Contingency Amount) -134,860 (OZ 190 Off -Site 1rj"(1±I .14 0 &0 Total: 536,037 l23J 2C ** Includes future classroom, Building A. *Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form SWU-101 Version 3.99 Page 2 of 4 7. How was the off -site impervious area listed above derived? The offsite area was taken from the existing permit and checked with topographic map, which found the area to be less than stated in the permit. No change is requested. The offsite area consists of the campus Loop Road from the existing pond north to Sidbury Road. IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, out parcels, 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. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. 2. No more than square feet of any lot shall be covered by structures or impervious materials. Impervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but not include wood decking or the water surface of swimming pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. 4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction. 5. All permitted runoff from the outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SWU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of 4 VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. 1. Please indicate that you have provided the following required information by initialing in the space provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form • One copy of the applicable Supplement Forms) for each BMP oddAz • Permit application processing fee of $420 (payable to NCDENR) • Detailed narrative description of stormwater treatment/management • Two copies of plans and specifications, including: - Development/ Project name - Engineer and firm - Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, finished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Daniel E. Dawson, PE Designated agent (individual or firm): WK Dickson & Co., Inc. Mailing Address: 909 Market Street City Wilmington State Phone: (910) 7624200 VIII. APPLICANT'S CERTIVICATION NC Zip: 28401 Fax: (910) 762-4201 I, (print or type name of person listed in General Information, Item 2) Dr. Eric McKeithan, President , certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants w' 1 be recorded, d that the proposed project complies with the requirements of 15A NCAC 2H.1000. . f Signature: Form SWU-101 Version 3.99 Page 4 of 4 (to be provided 4y DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an ono nal DCVO Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. I. PROJECT LN_'OR)AjTON Project Name: jnity Cnllegp Contact Person: Nk�r'k N. I rarwP, P E Phone Number. 0910 Forprojects with multiple basins, specify which basin this worksheet applies to: Pnnri No 1 elevations Basin Bottom Elevation 21.50 ft. Permanent Pool EIevation 27.50 ft_ Temporary Pool Elevation 28455 ft. :yeas Permanent Pool Surface Area 96.948 sq. ft. Drainage Area 41.6 ac. Impervious Area volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DA1 Diameter of Orifice Design Rainfall Design TSS Removal' - 29.12 ac. 515,398 cu. ft. -4245 -- cu. ft. 105,041 cu.ft. 3.90 WSM �a -_ I (floor of the basin) (elevation of the orifice) (elevation of the discharge structure over (water surface area at the orifice elevation) (on -site and off -site drainage to the basin) (on -site and off -site drainage to the basin) (combined volume of main basin and forebay) (volume detained above the permanent pool) (approximately 20% of total volume) (surface area to drainage area ratio from DWQ table) (2 to 5 day temporary pool draw -down required) (minimum 85% required) For.n SW-[ -102 Rev _.99 P,oP 1 1 When usined upon the g the Division SA/DA tables, the correct SAlDA ratio for permanent o01 sizing should be computed actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value forcon- standard table entries. In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal. The NCDE..1R BW manual provides design tables for both 85% TSS removal and 90% TSS removal. II. REQUIRED ITEMS CHECKLIST The following Departmentan checklist outlines design requirements per the Stormwater Best Management Practices Mual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent -may initial below. If a requirement has not been met, attach justification. Applicants Initials /rI'h a- The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). mW b. The forebay volume is approximately equal to 20% of the basin volume. /nN4 c. The temporary pool controls runoff from the -design storm event. --A k' d. The temporary pool draws down in 2 to 5 days. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) f. The basin length to width -ratio is greater than 3:1. m ►�'� g. The basin side slopes above the permanent pool are no steeper than 3:1. ill tjg h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). mNi! i. Vegetative cover above the permanent pool elevation is specified_ ml'# j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. " L If the .basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. m. A mechanism is specified hick will drain the basin for maintenance or an emergency. An d p ,4y ed doto a-i III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one) 0 does 'Kdoes not incorporate a vegetated filter at the outlet. This system (check one) 0 does ydoesnot incorporate pretreatment other than a forebay. Form SWU-102 Rev 3-99 n___ ') _: , Pond 1 Maintenance activities shall be performed as follows: Revised 12/22/c. 1. After every significant runoff producing rainfall event and at leastmonthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functig- ing: 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or strea m, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into ac-ppulated sediments. When the permanent pool depth reads d -5 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads .07 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) 0 Permanent Pool Elevation _ 27.50 Sediment Re oval El. �9S 75 P l -�� - -- _ ____Sediment Removal Elevation 23.00 I Bottom Ele ation 75; Bottom Elevation 21 .50 25% FOREBAY HALM POND �. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. �. If the basin must be drained for an emergency or to perform maintenance, the flushinEr of sediment through the emergency drain shall be minimized to the maximum extent practical. orm SWU-102 Rev 3.99 p,,— : C' ., I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to changes to the system or responsible party. Print name: Bic B. MMeltht Title: R ESidA - CFI Address: 411 "C& Frrnt StrEq WjIOrgtcn, PC 29401 Phone: 91Q-251-5100 Signature.�,� Date: . g 3 q Note: The fegallytespt'M" ible party should not be a homeowners association unless more than 50% of the Iots have been sold axesident of the subdivision has been named the president a Notary Public for the State ofltSA,h Ci`ll6/�1� County of 4U�I ; do�hereb�ycertify- that A i//i e-- z!g�- personally appeared before me this day of and acknowledge the d execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official sea a SEAL ivly commission expires aO-e3e 2eDj Fnrrr C<xTt i_7 n'7 A.,., 1 nn � G Permit No. 5w" l cIo cJ (to be provided 1, 1)W State of North Carolina Department of Environment and Natural Resources Division of Water Quality Revisd 12/22/99 STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basi. supplement for each basin, design calculations, and plans and specifications showing all basin and outle structure details. I. PROJECT-R,6"'nON Project Name: Cdpe Fedr Cr rrrn ml tY col Ie9p Contact Person: Mark N. Hdrgrove, P. E. Phone Number. f_ 910 1 762-4 00 For projects with multiple basins, specify which basin this worksheet applies to: Pond 2 elevations Basin Bottom Elevation 20.0 ft. Permanent Pool Elevation 25.0 Temporary Pool Elevation , 25.80 ft_ areas Permanent Pool Surface Area 31,061 sq. ft Drainage Area 9.20 ac. Impervious Area 6,44 ac. volumes Permanent Pool Volume P 100,021 cu. ft. Temporary Pool Volume _ 25.732 cu. ft. Forebay Volume (P 20.404 cu. ft. Other parameters S AIDA 1 Diameter of Orifice 2.0 in. Design Rainfall 1 in. (floor of the basin) (elevation of the orifice) (elevation of the discharge structure overflow) (water surface area at the orifice elevation) (on -site and off -site drainage to the basin) (on -site and off -site drainage to the basin) (combined volume of main basin and foreba_y) (volume detained above the permanent pool) (approximately 20% of total volume) (surface area to drainage area ratio from DWQ table) (2 to 5 day temporary pool draw -down required) Design TSS Removal'- 90 % (minimum 85% required) Form SNVU-102 Rev i.99 .,- __ , . I 1JVL"ULG1). r= l When using the Division SA/DA tables, the correct SA/DA ratio for permanent pool sizing should be computed based upon tr actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for n standard table entries. 2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provi 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS-removal- II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Man, (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Cc Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporti documentation is attached. If the applicant has designated an agent in the Stormwater Management Pern Application Form,_.th& gent may initial below. If a requirement has not been met, attach justification. Applicants Initials MJ'X a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). mh' jam_ b. The forebay volume is approximately equal to 20% of the basin volume. c. The temporary pool controls runoff from the design storm event. d. The temporary pool draws down in 2 to 5 days. e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) Mud f. The basin length to width*ratio is greater than 3:1. g_ The basin side slopes above the permanent pool are no steeper than 3:1. .41J h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail), 4114 i. Vegetative cover above the permanent pool elevation is specified. t i} j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest rial of -quay. 1. If the basin is used for sediment and erosion control during construction, clean out of tht basin is specified prior to use as a wet detention basin. M/4 m. A mechanism is specified %yhicp will drain the basin for maintenance or an emergency_ PO4 w;/1 6t, p Kj ,ed cv,, III. WET DETENTION BASIN OPERATION AL D NLAINTENANCE AGREEi4TEtiIT The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one) 0 does ,.does not incorporate a vegetated filter at the outlet. This system (check one) 0 does does not incorporate pretreatment other than a forebay. 'Pr%- 4Z wry I in-) n_._ I An row 2 Maintenance activities shall be performed as follows: Revised 12/ 2/gg 1. After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when de th is reduced -to 75% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into a�umulated sediments. When the permanent pool depth reads 3 ,11 v feet in the main pond, the sediment shall be removed When the permanent pool depth reads 3.00 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) Q Permanent Pool Elevation 25.00 SedimenAReoval El. 22.00 75 Sediment Removal Elevation 21.25Bottation qa_____________ _ -------------------------- _ Bottom Elevation 20.00 25% FOREBAY MALN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-102 Rev 3.99 Pate 3 of 4 ' rul UUILipUilciits of the wei oetenuon basin system shall be maintained in good working order. e. I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: ErIC B. Mkift Title: Presidffrt - CFCC Address: 411 Sari F= S -mt Wilrrringtrn, KC 28V PhnnP- Si 910-251 51M Date: 4 I / � at Note: The legally responsible parry should not be a homeowners association unless more than 5090 of the lots have been sold and a reside¢[ of the subdivision has been named the president. I, N • 67 � '" / 5 a Notary Public for the State of/ilor� County of 8G0 ?VY I I do hereby certify that CiL-I'G personally appeared before me this �� day of�%�m,�e�'l99 and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, r SEAL. Iy commission expires 3D�J6� T=n— curtr in,) n_.. n nn .. Q Permit No. SW8 1 �C)C�ZS HC% 4 (to be provided by DWG State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORNI WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. PROJECT(' INf0R54AT10N Project Name: Cape Fear Contact Person: Mark Hargrove Phone Number: (910) 762-4200 For projects with multiple basins, specify which basin this workshee-t applies to: Pond No. 3 elevations Basin Bottom Elevation 19.5 ft. (floor of the basin) Permanent Pool Elevation _ 25.00 ft. (elevation ofthe orifice) Temporary Pool Elevation 26.20 fl. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area Drainage Area Impervious Area volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume other parameters S AiDA' Diameter of Orifice Design Rainfall Design TSS Removal Footnotes: . 40.00 00 260.854 99,785 59,461 sq- ft (water surface area at the orifice elevation) ac. (on -site and off -site drainage to the basin) ac. (on -site and off -site drainage to the basin) cu. ft. (combined volume ofmain basin and forebay) cu. ft. (volume detained above the permanent pool). cu. ft. (approximately 20% of total volume) i in. 90 % (surface area to drainage area ratio from, DWO table) (2 to 5 day temporary pool draw -down required) (minimum 85 % required) When using the Division SA/A tables, the correct SA fDA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for nonstandard table entries. In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is desiu-ned to provide 90% TSS removal. The NCDENR B?vfP manual provides design tables for both S5% TSS removal and 901io TSS removal. Form Stiti-i 1-t m R ; oa II. REQURED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (IN Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A C. NCAC 2H. 1008.. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent may initial below. If a requirement has not been met, attach justification. Applicants Initials Aft�_ a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). /11),%►, b. The forebay volume is approximately equal to 20% of the basin volume. —PA N i1 c. The temporary pool controls runoff from the design storm event. -The featporary pool draws down in 2 to 5 days.. .IV e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations rH ti f. The basin length to width ratio is greater than 3: 1. tit ti d g. The basin side slopes above the permanent pool are no steeper than 3: 1. ' h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). III !ti'/'ti i. Vegetative cover4. above the permanent pool elevation is specified. mart' j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right-of-way. 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. A mechanismis specif ed which will drain the basin for maintenance or an emergency. III. NVET DETEti"TION BASIN OPERATION A\TD M-UN- 7ENANCE AGREEti-IENT The vet detention basin system is defined as the wet detention basin, pretreatment includins foreba_and the vegetated filter if one is provided. rs This system (check one) O does does not incorporate a vegetated filter at -the outlet. This system (check one) O does does not incorporate pretreatment other than a forebay. Form SNVU-102) Rev 3.99 pave 2 of 4 Maintenance activities shall be performed as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed_ 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the_original d6sip depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner _and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 4.13' feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 10' feet in the forebay, the sediment shall be removed. BASIN DIAGRAMt (fill in the blanks) Permanent Pool Elevation J 25.0 Sediment oval El 2�J1,75 Sediment Removal Elevation 20.87 75% Bottom Ele anon 21.0 96------- -----------_- ___ Bottom Elevation 19.50 25% FOREBAY MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. b. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. 7. All components of the wet detention basin system shall be maintained in good working order. Form SWli-102 Rev 3.99 Page 3 of 4 I arknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to an changes to the system or responsible party. Y Print name: Eric B. McKeithan Title: President - CFCC Address: 411 South Front Stre( Phone: (910) 362-7555 Date: Signature: Wilmington, NC 28401 1 Note: The legally responsible party should not be a homeowners association unless more than 50% of have been sold and a resident of the subdivision has been named the president. the lots %L' 0_1 LLZ8 C'`- a Notary Public for the State of County of /UC() H1+I1)O U 67/2. do hereby certify that Ey2 personally appeared before me this _N day of C1 e TO Q?__ a v o,3 and acknowledge the due execution of the forgoing wet d6tention basin maintenance requirements. Witness my hand and official seal, SEAL My commission expires I _.1 C l Form SNtiTI 102 Rev 3.99 r,,,,A ,, -CA .P Permit No. SW8990923 (to be provided by DWQ) State of North Carolina Department of Environment and Natural' Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWQ Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. 1. PROJECT INFORMATION Cape Fear Community College — North Campus Project Name: Campus Loop Access Road and Truck Driver Training Facility Contact Person: Phil Norris, P.E. Phone Number: (910) 343-9653 For projects with multiple basins, specify which basin this worksheet applies to: Pond No. 4 elevations Basin Bottom Elevation 23.00 ft. (floor of the basin) Permanent Pool Elevation 27.50 ft. (elevation of the orifice) Temporary Pool Elevation 28.50 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 43,456 sq. ft. (water surface area at the orifice elevation) Drainage Area 14.48 ac. (on -site and off -site drainage to the basin) Impervious Area-1-2-1-3 j�;3� ac. (on -site and off -site drainage to the basin) volumes / Permanent Pool Volume 142,780 cu. ft. (combined volume of main basin and forebay) Temporary Pool Volume 46,300 cu. ft. (volume detained above the permanent pool) Forebay Volume 29,250 cu. ft. (approximately 20% of total volume) other parameters SA/DA' 0.064 (surface area to drainage area ratio from, DWQ table) Diameter of Orifice 3.0 in. (2 to 5 day temporary pool draw -down required) Design Rainfall 1.0 in. Design TSS Removal 90 % (minimum 85%required) Footnotes, i U N 6` 0 C 1 ' When using the Division SAIDA tables, the correct SAIDA ratio for permanent pool sizing quld becomputed based upon the actual impervious % and permanent pool depth. Linear interpolation should be kmplw _to 3eteririine -tl�ie correct value for nonstandard table entries. 2 In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal. Form SWU-102 Rev 3.99 Page 1 of 4 Footnotes: I . When using the Division SA/DA tables, the corrw SA/DA ratio for pem>anent pool sizing should be acnral impervious % and permanent pool depth Linear interpolation should be employed to detertnine� based upon rfie stanc}ard table entries_ correct value. for non- 2. In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet &tendon basin is 90'/o TSS-removal. The NCDENR BW manual provides design tables for both 85% TSS removal d 90� ��to pval_ U. REQUIRED TTEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N-C. Department of Environment. Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided. to indicate the following design requirements have been met and supporting documentation isattached.' If the applicant has designated an agent in the Stornwater Management Permit Application Forin, the'atent iriay initial below. If a requirement has not been met, attach justification. Applicgpu Initials a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). b. The forebay volume is approximately equal to 20% of the basin volume. C. The temporary pool controls runoff from the design storm event. d. The temporary pool draws down in 2 to 5 days_ e. If required, a calculations. 30-foot vegetative filter is provided at the outlet (include non -erosive flow f The basin length to width ratio is greater than 3:1. Q- The basin side slopes above the permanent pool are no steeper than 3.1. h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). i. Vegetative cover above the permanent pool elevation is specified. j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right_ of -way. 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is 'specified prior to use as a vet detention basin. m. A mechanism is specified which will drain the basin for maintenance or -an emergency. III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMEN -T The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one) ❑ does ® does not incorporate a vegetated filler at the outlet. This system (check one) does ®does got incorporate pretreatment other than a forebay. Maintenance activities shall be performed as follows: 1. After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of temporary pool occurs within 2 to 5 days as designed_ 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed_ 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75°/0 of•the original design depth (see diagram below). Removed sediment shall be disposed of in an approptiateIrrahner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.) The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 3.38 feet in the -main pond, the sediment shall be removed. When the permanent pool depth reads 3.38 feet in the forebay, the sediment shall be removed- 4 Sediment Re oval El. 24.13 Bottom EI vation L3W 5 6 FOREBAY BASIN DIAGRAM rill in the hlanks) Permanent Pool Elevation 27.50 750 --- Sediment Removal Elevation 24.13 75% 5% - -------------------------------------- Bottom Elevation 23.0 25%/ u. h 'I►11 Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. If the basin must be drained.for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. ` r-___ n ... ..... r I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: Dr. Eric McKeithan Title: President Address: 411 North Front Street, Wilmington, NC 28401 Phone: 910-362-7001 Date: Signa Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I, OLAX A . CA111002 _ , a Notary Public for the State of 1\)0 (Z.f 4 (2AAl )& County of PC NO1512i do hereby certify that EIZ4C 15. ,MC1 T personally appeared before me this -L— day of jUrj L c�60 r1 and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, NOTARY PUBLIC f/�f11111110 SEAL My commission expires Form SWU-102 Rev 3.99 Page 4 of 4 Summary of Impervious Areas for SW Permit Management Modification CFCC Public Safety Training Center DWQ Project No. SW 990923 Mod WKD Project No. 40155.00.wl 7.2.07 From Existing Permit: Area sq ft Description 32,060 Existing road 503,977 Future Impervious 536,037 Total Impervious Current Permit Modification Area (sq ft Description 25,265 Buildings 393,172 Area Paving and Existing Road 13,939 Parking Areas 871 Sidewalks 433,247 Subtotal 32,060) Less Existing Road 401,187 Total Safety Center 32,060 102,790 Existing Road Contingency Area 536,037 Total Impervious SW 990923.Mod Subject: SW 990923.Mod From: "Steve Leimer" <sleimer@wkdickson.com> Date: Mon, 2 Jul 2007 20:13:20 -0400 To: "Linda Lewis" <linda.lewis@ncmail.net> Steve Leimer, P. E. WK Dickson & Co, Inc. M. 910.512.1332 Content -Description: Summary of Impervious Areas.xls Summary of Impervious Areas.xls Content -Type: application/vnd.ms-excel Content -Encoding: base64 1 of 1 7/3/2007 7:57 AM LETTER OF TRANSMITTAL I&WK arDICKSON community infrastructure consultants 909.Market Street Wilmington, North Carolina 28401 TO: Linda Lewis North Carolina Department of Environment and Natural Resources Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 910.762.4200 tel 910.762.4201 fax DATE: June 26, 2007 SUBJECT: SW Permit Documents DWQ No SW8 990923 Mod. Public Safety Training Center CFCC, North Campus PROD. NO: 40155.00.WL We are sending via: ❑ Overnight ❑ Regular Mail ❑ Pick-up ® Hand Delivered The following items: ❑ Correspondence ❑ Plans ❑ Specifications ® Other as listed below: COPIES DATE DESCRIPTION 1 NA Revised page 2 of 4 showing a total impervious area of 536,037 sq. ft. 1 6.26.07 Summary of Impervious Areas for your information 1 --- - ------_....... _ __— ----- ----- ---- - --- ... - - --- -- -- - — — ---...—......... Stormwater Management Permit Application for Signing on Page 4 THESE ARE TRANSMITTED as checked below: ❑ For Approval ® As Requested ❑ Approved as Submitted ❑ Returned for Corrections ❑ For Your Use ® For Review and Comment ❑ Approved as Noted ❑ Forward to Subcontractor REMARKS: COPY TO: Dan Dawson, WKD File 4015500wl JUN 18 2,07 SIGNED: e Leimer, PE Re: CFCC Public Safety SW8 990923 Mod. Subject: Re: CFCC Public Safety SW8 990923 Mod. From: Linda Lewis <linda.lewis@ncmail.net> Date: Tue, 26 Jun 2007 08:50:00 -0400 To: Steve Leimer <sleimer@wkdickson.com> Steve: The June 2004, permit had a total BUA of 536,037 sf for Pond 4, which included 32,060 sf of existing BUA and 503,977 sf for future development. If the proposed BUA for project is 401,187, then when you subtract that from 503977, you have 102,790 sf leftover. Unless the 401187 you report in the narrative includes the 32060 sf of existing impervious? If it does, then 536037 - 401187 = 134850 leftover for future development. Between existing, proposed, and contingency, it all has to add up to the max BUA for Pond 4 of 536,037. You don't ever want to apply for less than the maximum. Linda Steve Leimer wrote: Linda, The proposed figure of the 503,997 sf includes 32,060 sf from existing road, 401,187 sf from the Safety Training Center, and 70,730 sf of contingency area. This is described in the Stormwater Narrative (copy attached) . I understood from your previous comments that the proposed figure should include all impervious areas. If I am incorrect, please advise if the proposed should show 401,187 sf for this project or 471,937 sf for this project and the contingency area. Steve Leimer, P. E. M: 910.512.1332 -----Original Message ----- From: Linda Lewis [mailto: linda. lewis@ncmail. net] Sent: Monday, June 25, 2007 10:49 AM To: Steve Leimer Subject: CFCC Public Safety SW8 990923 Mod. Steve: One more thing- the BUA listing on page 2 of the application for Pond 4 left off the existing BUA of 32,060 sq; ft. The grand total of BUA for Pond 4 should be 536,037 sq. ft. Please make this change to the application and supplement. Linda 1 of 1 6/26/2007 8:50 AM CFCC Public Safety Center Subject: CFCC Public Safety Center From: Linda Lewis <linda.lewis@ncmail.net> Date: Mon, 25 Jun 2007 10:33:57 -0400 To: Steve Leimer <sleimer@wkdickson.com> Steve: I received yet another copy of the Pond 4 supplement form. I MUST have an original signature and an original notary on the document before issuing the permit. Thank you. Linda 1 of 1 6/25/2007 10:49 AM SITE LOCATION MAP N.T.S. GRAPHIC SCALE 0 100 200 300 400 500 600 700 SCALE: 1"=300' DICKSON ot"'N'Awto SIDBURY ROAD ........... NX .00 X MAIN ENTRANCE TO CFCC NORTH CAMPUSp--�', 7i Y" N, uWi . . ...... Hi PISTA �A. 909 MARKET STREET ate : 03/01/07 VALMINGTON, N 401E - (910) 7FU-1200 Cale: --300 .—.--.......--IDrawn : JRM CAPE FEAR COMMUNITY COLLEGE NORTH CAMPUS ft IR* CAROLINA ENVIRONMENTAC\ MANAGEMENT COMMISSION DIVISION OF WATER QUALITY N--J (*,I- BUC SAFETY CENTER RECEIVED MAR 0 2 2007 OVERALL SITE PLAN Office Locations: North Cardino CFCC Public Safety SW8 990923 Mod. Subject: CFCC Public Safety SW8 990923 Mod. From: Linda Lewis <linda.lewis@ncmail.net> Date: Mon, 25 Jun 2007 10:48:55 -0400 To: Steve Leimer <sleimer@wkdickson.com> Steve: One more thing- the BUA listing on page 2 of the application for Pond 4 left off the existing BUA of 32,060 sq, ft. The grand total of BUA for Pond 4 should be 536,037 sq. ft. Please mace this change to the application and supplement. Linda Sa3q,'� & (we. VOW-) .2v 5osciv- qW 17 = tozl qo 1 of 1 6/25/2007 10:49 AM CFCC North Campus SW8 990923 Subject: CFCC North Campus SW8 990923 From: Linda Lewis <linda.lewis@ncmail.net> Date: Thu, 24 May 2007 16:52:17 -0400 To: Steve Leimer <sleimer@wkdickson.com> Steve: Thank you for the supplements that you sent in. I'm not sure what has happened, but the Pond 4 supplement is incorrect and needs to be corrected. The current application for Pond 4 requests a drainage area of 14.48 acres and a BUA of 536,037 sq. ft., however the supplement form that appears to have been included with the June 2004 application, reports a drainage area of only 12.11 acres and a BUA of 422,096 sq. ft. These are the only two numbers on the supplement that will need to be corrected before the permit can be issued. All the other numbers remain the same. Please correct page 1 and have Mr. McKeithan sign, date & notarize a new original supplement form. Thank you. Linda 1 of 1 5/24/2007 4:52 PM CFCC North Campus Mod. SW8 990923 Subject: CFCC North Campus Mod. SW8 990923 From: Linda Lewis <linda.lewis@ncmail.net> Date: Wed, 06 Jun 2007 10:19:11 -0400 To: Steve Leimer <sleimer@wkdickson.com> Steve: I received what was purported to be the original signature page of the Pond 4 supplement, however, it is a photocopy. Please locate and submit the original signature page for this supplement. Thanks, Linda 1 of 1 6/6/2007 10:38 AM CFCC North Campus Modification SW8 990923 Subject: CFCC North Campus Modification SW8 990923 From: Linda Lewis <linda.lewis@ncmail.net> Date: Mon, 04 Jun 2007 12:13:12 -0400 To: Steve Leimer <sleimer@wkdickson.com> Steve: Thanks for the faxed pages for Pond 4, however, I will need the originals before proceeding with the review. Linda 1 of 1 6/4/2007 12:41 PM Peggy Brickhouse From: Steve Leimer Sent: Monday, June 04, 2007 10:10 PM To: Daniel E. Dawson; Peggy Brickhouse Subject: FW: CFCC North Campus Modification SW8 990923 Steve Leimer, P. E. M: 910.512.1332 -----Original Message ----- From: Linda Lewis [mailto:linda.lewis@ncmail.net] Sent: Monday, June 04, 2007 12:13 PM To: Steve Leimer Subject: CFCC North Campus Modification SW8 990923 Steve: Thanks for the faxed pages for Pond 4, however, I will need the originals before proceeding with the review. Linda 1 Permit No. SW8990923 (to be provided by DWQ) State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review: A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. 1. PROJECT INFORMATION Cape Fear Community College — North Campus Project Name: Campus Loop Access Road and Truck Driver Training Facility Contact Person: Phil Norris, P.E. Phone Number: (910) 343-9653 For projects with multiple basins, specify which basin this worksheet applies to: Pond No. 4 elevations Basin Bottom Elevation Permanent Pool Elevation Temporary Pool Elevation areas Permanent Pool Surface Area Drainage Area Impervious Area volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume other parameters SAIDA' Diameter of Orifice Design Rainfall Design TSS Removal Footnotes: 23.00 27.50 28.50 43,456 14.48 12.13 142,780 46,300 _ 29,250 ft. (floor of the basin) ft. (elevation of the orifice) ft. (elevation of the discharge structure overflow) sq. ft. (water surface area at the orifice elevation) ac. (on -site and off -site drainage to the basin) ac. (on -site and off -site drainage to the basin) cu. ft. (combined volume of main basin and forebay) cu. ft. (volume detained above the permanent pool) cu. ft. (approximately 20% of total volume) 0.064 3.0 in. 1.0 in. 90 % (surface area to drainage area ratio from, DWQ table) (2 to 5 day temporary pool draw -down required) (minimum 85% required) When using the Division SAIDA tables, the correct SAIDA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for nonstandard table entries. In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal. Form SW-102 Rev 3.99 Page 1 of 4 Footnotes: L When using the Division SA/DA tables, the cmect SA/DA ratio for pemment pool sizing should be standard table errthe waW s % nd pe manent pool depth. Linear interpolation should be employed to determine the correct �� on- iLK 2. In the 20 emstal axinfies, the reP&emerrt for a vegetative filter may be waived if the wet detention basin is igned W/o TSS-removal. The NCDENR BW manual provides desiffi to tables for both 85% TSS removal gpdj,��removalvide II- REQUIRED ITEMS cmacun The following checklist outlines design requirements per the Stormwater Best Management Practices Ivianual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H .1008. Initial in the space provided.to indicate the following design requirements have been met and supporting documentation is attached.': -If the applicant has designated an agent in the Stormwater Management Permit Application Fotrn, theageni iriay initial below. If a requirement has not been met, attach justification. —4— fs a. The permanent pool depth is between 3 and 6 feet (required. minimum of 3 feet). b. The foreba 1 y vo ume is approximately equal to 20% of the basin volume. c: The temporary pool controls runoff from the design storm event. d. The temporary pool draws down in 2 to 5 days- e. If required, a 3 calculations. 0-foot vegetative filter is provided at the outlet (include non -erosive flow f. The basin length to width ratio is greater than 3:1. g- The basin side slopes above the permanent pool are no stee th h. A submerged and vegetated Pef an 11. Perimeter shelf with a slope of 6:1 or less (show detail). i. Vegetative cover above the permanent pool elevation is specified. j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin includil-� g of -way. access to nearest right_ 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. m. A mechanism is specified which will drain the basin for maintenance br an emergency. III• WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one) ❑ does ® does not incorporate a vegetated filter at the outlet. This system (check one) ❑ does 0 does not incorporate pretreatment other than a forebay. Maintenance activities shall be performed as follows: l . After every significant runoff producing rainfall event and at least monthly: a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. I Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75Voof•the original design depth (see diagram below). Removed sediment shall be disposed of in do appropliate lTrahner and shall be handled in a manner that will not adversely impact water quality (i_e. stockpiling near a wet detention basin or stream, etc.) The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 3.38 feet in the -main pond, the sediment shall be removed. When the permanent pool depth reads 3.3$ feet in the forebay, the sediment shall be removed. Sediment Re oval EL - 7� Bottom El vation 23-0 5 FOREBAY BASIN DIAGRAIVI 011 in the blanks) Permanent Pool Elevation 27.50 Sediment Removal Elevation 24.13 75% %----------------------------------- -- --- Bottom Elevation 23.0 25% 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. If the basin must be drained.for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. ` Form, GMd!;_an, IIr,_.,-- n nn I acknowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: Dr. Eric McKeithan Title: President Address: 411 North Front Street, Wilmington, NC 28401 Phone: 910-362-7001 Date: Signal Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I, �1E 1��}l l i.�C✓I� _ , a Notary Public for the State of 6)O214 CAPAIJAA County of P A/ 01 YZ- do hereby certify that QUC 6 �L' �C 1 I IMN personally appeared before me this -L day of tJ (,t,N L c20017 and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, tOptlifUlltih��/t NOTARY = PUBLIC ,V fat/111111iN SEAL My commission expires a,l ao 1 Form SWU-102 Rev 3.99 Page 4 of 4 LETTER OF TRANSMITTAL W�WK©ICKSON community infrastructure consultants 909 Market Street TO: Ms. Linda Lewis Wilmington, North Carolina 28401 910.762.4200 tel 910.762.4201 fax NC Department of Environment and NR Division of Water Quality 127 Cardinal Drive Extension Wilmington, North Carolina 28405 DATE: May 23, 2007 SUBJECT: CFCC Safety Center Permit Applications PROD. NO: 40155.00.WL We are sending via: ❑ Overnight ❑ Regular Mail ❑ Pick-up [►Hand Delivered The following items: ❑ Correspondence ❑ Plans ❑ Specifications [Other as listed below: COPIES I DATE I NO. I DESCRIPTION 1 1 Approved Supplement Forms for Ponds 1, 2, 3, and 4 THESE ARE TRANSMITTED as checked below: ❑ For Approval g As Requested ❑ Approved as Submitted ❑ Returned for Corrections ❑ For Your Use ❑ For Review and Comment ❑ Approved as Noted ❑ Forward to Subcontractor REMARKS: Linda — Attached is information from Carl Brown at Cape Fear Community College. This is the information you requested in your e-mail to me. Should you need anything further, please let me know. 'AY' 2 4 7007 Y: I COPY TO: SIGNED: Steve Leimer, PE RE: CFCC North Campus SW8 990923 Subject: RE: CFCC North Campus SW8 990923 From: "Steve Leimer" <sleimer@wkdickson.com> Rate: Wed, 23 May 2007 11:54:38 -0400 To: "Linda Lewis" <linda.lewis@ncmail.net> I will try to get you copies as soon as possible. Thank you for your review. -----Original Message ----- From: Linda Lewis [mailto:linda.lewis@ncmail.net Sent: Wed 5/23/2007 11:26 AM To: Steve Leimer Cc: Ed Beck Subject: CFCC North Campus SW8 990923 Steve: I wrote the permit yesterday and started searching for the previously approved supplement forms for Ponds 1, 2 and 3, however, I was unable to locate the originals in our files. I think that they were somehow misplaced after the last permit modification. I have requested copies from Central Files, but I do not know how long that will take. Since I would really like to get this permit issued as quickly as possible, can I trouble you to ask Dr. McKeithan to make a copy of all of the wet pond supplement forms from his June 18, 2004, permit and send them to me? Thanks, Linda 1 of 1 5/23/2007 4:04 PM WK DICKSON community infrastructure consultants March 1, 2007 Ms. Linda Lewis North Carolina Department of Environment and Natural Resources Division of Water Quality 127 Cardinal Drive Extension Wilmington, North Carolina 28405 RE: Revised Stormwater Management Permit Application Public Safety Training Center Cape Fear Community College, North Campus, New Hanover County, NC DWQ Project No. SW 990923 Mod WKD Project No. 40155.00.WL Dear Ms. Lewis: Thank you for your review of the application for a Stormwater Management Permit for the Public Safety Training Center at the CFCC North Campus in New Hanover County, NC. Enclosed is the material you requested in your letter of February 7, 2007 including: 1. Two copies of Drawing 2.04 showing pavement and building dimensions. 2. Two copies of an Overall Site Plan for the North Campus showing all existing improvements and the proposed Public Safety Training Center. 3. Two copies of a Site Plan for a proposed pump station. Please note that it has been determined that a sanitary sewer pump station is needed to serve the Safety Center and other portions of the North Campus. The Overall Site Plan shows the location of this pump station. This pump station site will add 1,600 square feet of imperious area to Pond #1 Drainage Area. Pond # 1 is sized to accept 1,112,087 square feet of future capacity. We look forward to your review and approval. Thank you. Sincerely, W. K. Dickson & Inc. MAR 1012001 BY: Steven D. Leimer, PE Enclosures as noted cc: Carl Brown, CFCC; Jim Stumbo, SCN Architects; Dan Dawson, WKD; Denise Freund, WKD 909 Market Street Wilmington, NC 28401 Tel. 910.762.4200 Fax 910.762.4201 www.wkdickson.com North Carolina . South Carolina . Georgia . Florida O�O� W A T '�qpG c >_ r February 7, 2007 Eric McKeithan Cape Fear Community College 411 Front Street Wilmington, NC 28401-3910 Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources Subject: Request for Additional Information Stormwater Project No. SW8 990923 Mod. Cape Fear Community College North Campus Public Safety Training Center New Hanover County Dear Dr. McKeithan: Alan W. Klimek, P.E. Director Division of Water Quality The Wilmington Regional Office received a modified Stormwater Management Permit Application for Cape Fear Community College North Campus -Public Safety Training Center on November 14, 2006. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: Please provide 2 layout plans with dimensions for the buildings, parking, sidewalks, streets, etc. 2. Please provide 2 overall Master Plan maps with the site located on it. 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 March 7, 2007, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax .number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action pursuant to NCGS 143-215.6A. Please reference the State assigned project number on aii 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 nof acceptable. If you have any questions concerning this matter please feel free to call me at (910) 796-7335. Sincerely, Linda Lewis Environmental Engineer ENB/arl: S:\WQS\STORMWATERIADDINFO\2007\990923.feb07 cc: Steve Leimer, P.E., WKDickson Linda Lewis North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone (910) 796-7215 Wilmington Regional Office Internet: www.ncwaterquality.ore Fax (910) 350-2004 tCarolina ra!!y Customer Service 1-877-623-6748 An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper CLSCF:PT:.^^ D4?E REVISIONS VALVE VAULT NOTES: 1. PUMP STATION ENTRANCE ROAD SHALL BE GRADED TO ENSURE POSITIVE DRAINAGE TOWARD THE LOOP ROAD AT 0.1 % SLOPE 2. MANHOLES, WETWELL, AND VALVE VAULT SHALL BE PLACED AT 6" ABOVE GRADE. 3. PUMP STATION AREA INSIDE FENCE TO HAVE 4", #57 M WASHED STONE. °RA't"c gg psi• Ale sr os;.sar our — I ="9 2oil °� x ulwc-ow, we zsaol D\NK SMI GARNET S.9EE? (910) 762-42iA DICKSON RELEASED FOR `: ]ATE APPROVALSNG _ BMING sazfi<.c_ia e www+E I sun o:�: SEE" t 15/o/2906 OfSae ia auane: community infrastructure consultants :' xth na Ola South Carolina .9.4do CONS UL'ilati NECONa awG. CONTROL `PANEL. \ i \ i i v � , v ,'t WET -WELL a � a _ T i 1 i :i E� 1, ,1 GENERATOR I PBOJ#��. E,I ,R 0 2 NORTH CAMPUS WATER MAIN AND WASTEWATER COLLECTION EXTENSION FOR PROPOSED PUNIP STATION{ LiDtAlnows CAPE FEAR COMMUNITY COLLEGE WILAMNOTON, NC LE CFCC North Campus Public Safety Training Center SW9 990923 Subject: CFCC North Campus Public Safety Training Center SW9 990923 From: Linda Lewis <linda.lewis@ncmail.net> Date: Wed, 07 Feb 2007 15:50:53 -0500 To: Steve Leimer <sleimer@wkdickson.com> Steve: Attached please find my two review comments for this project. Linda ..................... ... Content -Type: application/msword 990923.feb07.doc Content -Encoding: base64 ................. _..._.._ 1 of 1 2/7/2007 3:51 PM OF W ATF9 O� QG O 'C February 7, 2007 Eric McKeithan Cape Fear Community College 411 Front Street Wilmington, NC 28401-3910 Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources Subject: Request for Additional Information Stormwater Project No. SW8 990923 Mod. Cape Fear Community College North Campus Public Safety Training Center New Hanover County Dear Dr. McKeithan: Alan W. Klimek, P.E. Director Division of Water Quality The Wilmington Regional Office received a modified Stormwater Management Permit Application for Cape Fear Community College North Campus -Public Safety Training Center on November 14, 2006. A preliminary review of that information has determined that the application is not complete. The following information is needed to continue the stormwater review: Please provide 2 layout plans with dimensions for the buildings, parking, sidewalks, streets, etc. 2. Please provide 2 overall Master Plan maps with the site located on it. 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 March 7, 2007, or the application will be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including the application fee. If you need additional time to submit the information, please mail or fax your request for a time extension to the Division at the address and fax number at the bottom of this letter. The request must indicate the date by which you expect to submit the required information. The Division is allowed 90 days from the receipt of a completed application to issue the permit. The construction of any impervious surfaces, other than a construction entrance under an approved Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 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) 796-7335. Sincerely, Linda Lewis Environmental Engineer ENB/arl: S:\WQS\STORMWATER\ADDINFO\2007\990923.feb07 cc: Steve Leimer, P.E., WKDickson Linda Lewis North Carolina Division of Water Quality 127 Cardinal Drive Extension Wilmington, NC 28405 Phone (910) 796-7215 Wilmington Regional Office Internet: www.ncwaterguality.org Fax (910) 350-2004 N"o��cItCaro ' a dvatura�U Customer Service 1-877-623-6748 An Equal OpportunitylAffimtative Action Employer— 50% Recycled/10% Post Consumer Paper STORMWATER MANAGEMENT NARRATIVE And Drainage Calculations A New Public Safety Training Center Cape Fear Community College, North Campus New Hanover County, NC Revised November 3, 2006 NOV 14 2006 Dw ,Roy# sw�9�oq Prepared for Cape Fear Community College Under Contract to Stewart Cooper Newell Architects W. K. Dickson & Co., Inc. 909 Market Street Wilmington, North Carolina 28401 (910) 762-4200 Page 1 of 4 Stormwater Management Narrative A New Public Safety Training Center Cape Fear Community College, North Campus New Hanover County, NC WKD No. 40155.00.WL Revised November 3, 2006 PROJECT DESCRIPTION: The new Public Safety Training Center will be constructed on the North Campus of Cape Fear Community College (CFCC) located north of Wilmington in New Hanover County, NC. Theproject consists of various training facilities that will be used by CFCC, New Hanover County, and the City of Wilmington for training their Fire, Police, and EMS personnel in all areas of public safety. The project site is located east of the main campus buildings between a Campus Loop Road and Interstate 40. The site will include a Fire Apparatus Training and Maintenance building, a Fire Drill Tower, Residential and Commercial Burn Training buildings, a Tear Gas Training building, a Control Tower, Water Drafting Pits, a Vehicle Extrication Training pad, a Compressed Gas Small Fire Simulation pad, and a Truck Driver Training pad. Site work will include provisions for a future Classroom building. DISTURBED AREA: The maximum disturbed area for the Public Safety Training Center when it is completely built out is 11.38 acres, which includes 9.21 acres of imperious surface for the safety training area, the future classroom, and the driver training pad. The entire project area will drain into an existing wet bottom detention pond which was designed, permitted, and constructed to accept runoff from this project under NCDENR Division of Water Quality Stormwater Management Permit No. SW8 990923 Modification (attached). This pond is identified as Pond No. 4 in the permit. The existing pond was designed to accept flow from 630,632 sq ft (14.48 acres), including 32,060 sq ft (0.74 acres) of impervious area from the campus Loop Road and 503,,977 sq ft (11.57 acres) of impervious area from "future areas" (the new Public Safety Training Center). The actual proposed impervious area of the Public Safety Center will be 401,187 sq ft (9.21) acres. This aiiows a "contingency amount" of impervious area of 70,730 sq ft (1.62 acres). FLOODPLAIN: A portion of the site is located in Zone AE according to the most recent Flood Insurance Rate Map (FIRM) of April 3, 2006. This area is shown on the Existing Conditions Plan and the Grading Plan. The new FIRM uses the datum NGVD88, but the project datum is NGVD29. The FIRM indicates a 100-year flood elevation of 33.0, which equals 33.95 on the project datum. The site was in Zone C on the previous FIRM dated April 15, 1986. (Community Panel No. 370168- 0030 C.) Page 2 of 4 The new floodplain covers a portion of the proposed Truck Driver Training Pad and the existing detention Pond No. 4. No proposed buildings will be located in the existing floodplain. The proposed Truck Driver training pad will be raised more than one foot above the 100-year floodplain. STORMWATER MANAGEMENT: Under existing conditions, the site generally drains north and east at a maximum ground slope of approximately 1 percent, with several very flat areas. Runoff leaves the site to the east, flows under I- 40, then north to Prince George Creek, and eventually to the Cape Fear River. Several ditches exist that were apparently dug to help drain the site. One ditch flows east to a culvert under an 1-40 ramp. The other ditch flowed north, but was cut off by construction of the detention pond. The site is covered with small diameter trees and thick brush. Because the site will be used for intensive training with heavy duty vehicles, it will mostly be.paved with asphalt and concrete pavements. The existing ditches will be filled in, but the major drainage patterns will not be changed. The site will continue to drain north and east through the existing detention pond. The proposed stormwater management plan consists of constructing an enclosed storm sewer system to collect runoff form the various training facilities and direct the runoff into the forebay of the existing stormwater management plan. The Drainage Plan (Sheet 2.07) shows the storm sewer system and the drainage areas for the site. Also attached is the output data from the Hydaflow computer program used to size the sewers. The system is designed to collect runoff from the 10 and 25 year storms without surcharging. Runoff from greater storm events will flow overland to the existing pond. EROSION CONTROL MEASURES: The project will control erosion primarily with temporary protection measures using silt fence, drop inlet protection, curb inlet protection, rip rap at pipe outlets, stone check dams, and temporary construction entrances. The contractor will be required to install, maintain and remove upon completion silt fence as necessary to prevent any sediment from leaving the limits of disturbance. This will include temporary stockpile areas. The contractor will be required to clean and restore to pre -construction conditions any areas that may inadvertently be damaged due to the failure of the erosion control measures. SCHEDULING OF WORK: A Construction Sequence is shown on the project Drawings, which directs the contractor to install and maintain erosion control measures. It states: 1. Notify NCDENR Division of Land Resources and hold a pre -construction meeting on site prior to beginning work. 2. Construct temporary construction entrances. 3. Install silt fence around entire site, install check dam at existing ditch, and install curb inlet protection on the existing inlets in the campus Loop Road. 4. Construct temporary sediment trap. 5. Clear site, begin grading operations. Minimize disturbed area. 6. Place temporary seeding and mulch on disturbed areas as construction proceeds, but no more than 21 calendar days of completion of a grading phase. Page 3 of 4 7. Place silt fence around and temporary seeding on stockpiles that will remain more than 21 calendar days. Ensure that runoff from stockpiles will flow through silt fence before exiting project limits. 8. Install storm sewer beginning at outlet with permanent rip rap apron. Seed and mulch disturbed bank of pond. Construct temporary rip rap aprons in sediment basin. 9. Install inlet protection immediately upon completion of inlets. Install closed lids on manholes immediately upon completion. 10. Install remaining utilities, paving and facilities. 11. Monitor and maintain erosion control measures continually. Refer to maintenance plan shown on Detail sheets. 12. Monitor discharge into existing forebay, clean when sediment reaches 75% of capacity. 13. Clean and restore any area outside the project limits that is damaged due to failure of erosion control measures. Restore erosion control measures. 14. After all disturbed areas are stabilized with seeding or pavement, clean existing forebay of sediment to original design elevation. 15. Upon approval by NCDENR, remove erosion control measures and seed any disturbed areas caused by removal operations. 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CO U) O N I- M O h O O II Cl) E of U') U') of of OD co LO co t` t, tri °1 V c O 0 0 0 0 0 0 0 0 0 0 0 a to L6 0 N 6 to 66 to 6 tri 6 G V y h M tO T h h m to It m m m tv 2 n M r to V7 UO T OR M tt to to C7 F- Co CV T to � v d O co N T 0 (D E O o 1. co N m O O M M O O LO CO CO CO O m O O m to to C O T r O O O O O' O C T O O O N pN LO ,= 0 V to rn (O q 0 m LO m LO rn (O m LO m (O m LO m to m tO m to m O N V O O O O O O O O O O O O + y E IC p () v m N LO a r O w T CO T OD Cm0 LO CIJ (co (ND N H oi N N a 4 d O. CM N O co i t) tl CO m st N N m m O O CD � O O m co O m O m LO Cl(O N (fj } Cl) 'It O O O O O 0 T 0 � J � Ul C O m m CO r` UO N T "t M ¢ II J (O O � -e N a m M N M m CO LL "A co M T r (D T r T r r C C 0 L G C) W T N r sr N (o I- rn m r m m C � w F- J ` N M v to 0 t- CO m Or T 04 - a z OIL s}Da}iyo •' aMa� Nadoo DMOISSI- uw oo a�+oi r Dr. Eric McKeithan, President Trustees of Cape Fear Community College 411 South Front Street Wilmington, NC 28401 Dear Dr. McKeithan: Michael F. Easley, Governor ry North Carolina Department of c11virorUndht�and Natural Resouercess Alan W. )Qmek. P_E_,0ireator Division of Water Duality Coleen H_ Sufins, Deputy Director Division Of Water ouality June 18, 2004 DECEIVED JUN 21 20(4 ANDREW AND KOSKE. Subject: Permii,No. SW8 990923 Modification Cape Fear Community College -North Cwnpus High Density Stormwater Project New Hanover County The Wilmington Regional Office received a compiete modification to the Stormwater Management Permit Application for Cape Fear Cotfimunity College -North Campus on Julie 18, 2004. Staff review of the plans and specifications has determined that the project, as proposed will comply with the Stormwater Regulations set forth in Title l SA NCAC 21`1.1000. We are forwarding Permit No. S W8 990923 Modification dated June 18, 2004, for the construction of Cape ]Fear Cornmuniiy College -North Campus. This permit steal] be effective from the date of issuance until Jaiiiiary 28, 2010, (10 years from the original issue date) and shall be subject to the conditibns and limitations as specified therein. Please pay Special attention to the Operation and M' 'aintenuce requirements in this permit. Failure to establish an adequate syst-m for operation and Inairitenance 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 (330) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chaprer 15013 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. lfyou have any questions, or need additional information concerning this matter, please contact either Laurie Munn, or me at (910) 393-3900. Sincerely, Rick Shiver Water Quality Reiional-Supervisor RSS/ism: S:1V►QSISTORMWAWER-MIT1990923mod.jun04 CC: Phil=Norris,- P_E:. Tony Roberts, New l4anovet County Inspections Beth B. Wetherill, New Hanover County Engineering Laurie Munn Wilmington Regional Office Central Files Permit No. SW8 990923 Modification 1 NISION OF WATER QUALITY PROJECT DESIGN DATA SHEET Project Name. Cape Fear Community College North- Campus Permit Number. SW8 990923 Modification Location: Blue Clay Road, New Hanover County Applicant: Dr. Eric McKeithan, President Mailing Address: Application Date: Name of Receiving Stream/Index #: Classification of Water Body: Pond Number Drainage Area, acres: Onsite: -Ofisite: Total Impervious Surfaces; f 2: Buildings f Streets, f: Parking, f . Sidewalk, fly: Tennis Court,t'-: Future Area, fl-- bond Depth, feet: Permanent Pool Elevation, FMSL: Provided Surface Area, fl'-: Prodded Storage Volume, fl3: Temporary Storage Elevation, FMSL: Controlling Orifice Pipes: Forebay Volume, W: Trustees of Cape Fear Community College 411 South Front Street Wilmington, NC 28401 January 28, 2000 June 18, 2004 Modification Prince George Creek / CPF23 (18-74-53) "C Sw" Pond 1 41.60 41.60 0 1,268,467 31,363 11,761 91,040 22,216 0 1,112,087 6.00 27.50 96,948 104,272 28.55 3 @ 3.01f 105,041 Pond 2 9.20 9.20 0 280,526 0 23,958 57,500 0 0 199,068 5.00 25.00 31,061 25,661 25.80 1 @ 2.0tT 20,404 ' Vempt N.,. S W 8 990923 Modification ,�-XVISION OF WATER QUALITY .PROJECT DESIGN DATA SHEET Project Natne: Cape Fear Community College North Campus Permit Number: SW8 990923 Modification Location: Blue Clay Road, New Hanover County Applicant: Dr. Eric McKeithan, President Mailing Address: 'Trustees of Cape Feat Community College 411 South Front Street Wilmington, NC 28401 Application Date: January 28, 2000 June 18, 2004 Modification N&be ofReceivine, Stream/Index 4: Prince George Creek / CPF23 (18-74-53) Classification of rater 13o4y: "C SW# L Pond Number Pond 3 Pond 4 Drainage Area, acres: 40.00 14.48 Omit€: 40.00 14.48 Of#site: 0 0 Total Impervious Surfaces, ft : 1,219,680 536,037 Buildings ft':. 117,176 0 �- Streets, ft: 74,488 32,060 , Parking, ft2: 526,640 0 Sidewalk, ftZ: 120,226 0 Tennis Court, ftz: 46,174 0 Future Area, ft2: 334,976 503,977 — Pond Depth, feet: 5.50 4.50 Permanent Pool Elevation, FMSL: 25.00 27.50 Provided Surface Area, ft`: 78)605 43,456 Provided Storage Volume; ft3: 99,805 46,300 Temporary Storage Elevation, FMSL: 26.20 28.50 Controlling Orifice Pipes: 2 @ 3.0"gyp 3.0" Forebay Volume, ft3: 59,461 29,250 O1 FF-1 � 'r 11SV, ONLY ' _ Date Received Fee aid Permit Number il-/©f laaage29 ©?1U&- State of North Carolina Department of Environmental and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM This form may be photocopied for use as an original I. GENERAL INFORMATION 1. Applicants name (specify the name of the corporation, individual, etc. who owns the project): Cape Fear Community College (CFCC) 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): Dr. Eric McKeithan, President 3. Mailing Address for person listed in Item 2 above: 411 Front Street City: _ Wilmington State: N.C. Zip: 28401-3910 Telephone Number: (910) 362-7555 FAX: (910) 362-7046 4. Project Name (subdivision, facility, or establishment name — should be consistent with project name on plans, specifications, letters, operation and maintenance agreements, etc.): A new Public Safety Training Center 5. Location of Project (street address): 4500 Blue Clav Road City: CFCC North Campus County: New Hanover 6. Directions to project (from nearest major intersection): From Wilmington, take College Rd. (NC132) north to Blue Clay Road. Turn right to CFCC entrance. Turn right and follow campus Loop Road to Project site located behind the McKeithan Building. 7. Latitude: 34019' 20" N Longitude: 770 52' 11" W Contact person who can answer questions about the project: Name: Carl Brown Telephone: 910-362-7004 II. PERMIT INFORMATION: of project. 1. Specify whether project is (check one): New Renewal X Modification 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the existing permit number SW8 990923 and its issue date (if known) 6-18-2004 Form SWU-101 Version 3.99 Pagel of 4 Cape Fear Community College Revised Drainage Areas February 28, 2002 (Revised 12/11/03) Basin Information Drainage Area 1 Drainage Area 2 Drainage Area 3 Receiving Stream Unnamed Trib to Unnamed Trib to Unnamed Trib to Name Prince George Prince George Prince George Creek Creek Creek Receiving Stream C Sw C Sw C Sw Class Drainage Area 41.60 ac 9.20 ac 40.00 ac Existing -0- -0- -0- Impervious Area i. Proposed 29.12 ac 6.44 ac 28.00' ac Impervious Area % Impervious 6 % 6 % 50.9 % Area Current _- 70 % % Impervious 70 % 70 % Area Future Impervious Surface Area Drainage Area 1 Drainage e Area 2 Drain:a a Area 3 On -site Buildings 0.72 ac -0- 2.69 ac On -site Streets 0.27 ac 0.55 ac 1.71 ac On -site Parking 2.09 ac 1.32 ac 12.09 ac On -site Sidewalks 0.51 ac -0- 2.76 ac Tenrtis Courts & Walk -0- -0- 1.06 ac Subtotal 3.59 ac 1.87 ac 20.31 ac Other on -site Rest of Site is assumed 70% impervious 25.53 ac 4.57 ac 7.69 ac Off -site -0- -0- -0- Total: 29.12 ac 6.44 ac 28.00 ac RECEIVED DEC 1 1 2003 nwQ PROJ # SW � q= oq2 _ 3. Specify the type of project (check one): Low Density X High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): CAMA Major X Sedimentation/Erosion Control _ 404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Se..dce Center at 1-877-623-6748 III. PROJECT INFORMATION 1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Stormwater will be collected in a closed drainage system and discharged to the forebay of an existing wet bottom detention pond which was designed, permitted, and constructed to accept this flow. 2. Stormwater runoff from this project drains to the _ Cape Fear River Basin. 3. Total Project Area: 14.48 acres 4. Project Built Upon Area: 12.31 acres. 85% 5. How many drainage areas does the project have? 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach and additional sheet with the informatipn for each area provided in the same format as below. Basin Information Drainage Are (ftz) Drainage Area 2 Receiving Stream Name Prince George Creek Receiving Stream Class "C SW" Drainage Area 630,632 64.4$2e Existing hn ervious*Area 32,060 Proposed Impervious* Area 503,977 % Impervious* Area (Total) 85% Impervious* Surface Area Drainage Area 1 Drainage Area 2 On -Site Buildings ** 25,265 On -Site Streets (Area Paving On -Site Parking 13,939 On -Site Sidewalks 871 Other On -Site (Contingency Amount) 144,869 j UZ ?1I D i5 .* 0 &0 Total: 536,037 ** Includes future classroom, Building A. *Impervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form SWU-101 Version 3.99 Page 2 of 4 ' 7. How was the off -site impervious area listed above derived? The offsite area was taken from the existing permit and checked with tWogra hip c map which found the area to be less than stated in the permit No change is requested. The offsite area consists of the campus Loop Road from the existing pond north to Sidbury Road. IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The following italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, out parcels, 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. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number as issued by the Division of Water Quality. These covenants may not be changed or deleted without the consent of the State. 2. No more than square feet of any lot shall be covered by structures or impervious materials. Impervious materials include asphalt, gravel, concrete, brick stone, slate or similar material but not include wood decking or the water surface of swimming pools. 3. Swales shall not be filled in, piped, or altered except as necessary to provide driveway crossings. 4. Built -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to construction. 5. All permitted runofffrom the outparcels or future development shall be directed into the permitted stormwater control system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity and performance of the system as permitted. By your signature below, you certify that the recorded deed restrictions and protective covenants for this project shall include all the applicable items required above, that the covenants will be binding on all parties and persons claiming under them, that they will run with the land, that the required covenants cannot be changed or deleted without concurrence from the State, and that they will be recorded prior to the sale of any lot. V. SUPPLEMENT FORMS The applicable state stormwater management permit supplement form(s) listed below must be submitted for each BMP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the status and availability of these forms. Form SWU-102 Wet Detention Basin Supplement Form SWU-103 Infiltration Basin Supplement Form SWU-104 Low Density Supplement Form SWU-105 Curb Outlet System Supplement Form SWU-106 Off -Site System Supplement Form SVIU-107 Underground Infiltration Trench Supplement Form SWU-108 Neuse River Basin Supplement Form SWU-109 Innovative Best Management Practice Supplement Form SWU-101 Version 3.99 Page 3 of ' VI. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A complete package includes all of the items listed below. The complete application package should be submitted to the appropriate DWQ Regional Office. 1 Please findicate that you zve Yr^vided follcvving required fi ormnation by initialing in the space provided next to each item. Initials • Original and one copy of the Stormwater Management Permit Application Form ! • One copy of the applicable Supplement Form(s) for each BMP(� • Permit application processing fee of $420 (payable to NCDENR) • Detailed narrative description of stormwater treatment/management • Two copies of plans and specifications, including: - Development/ Project name - Engineer and firm - Legend - North arrow - Scale - Revision number & date - Mean high water line - Dimensioned property/project boundary - Location map with named streets or NCSR numbers - Original contours, proposed contours, spot elevations, fmished floor elevations - Details of roads, drainage features, collection systems, and stormwater control measures - Wetlands delineated, or a note on plans that none exist - Existing drainage (including off -site), drainage easements, pipe sizes, runoff calculations - Drainage areas delineated - Vegetated buffers (where required) VII. AGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behalf, please complete this section. Daniel E. Dawson, PE Designated agent (individual or firm): WK Dickson & Co., Inc. Mailing Address: 909 Market Street City Wilmington Phone: (910) 762-4200. State: NC VIII. APPLICANT'S CERTIFICATION Zip: 28401 Fax: (910) 762-4201 I, (print or type name ofperson listed in General Information, Item 2) Dr. Eric McKeithan, President certify that the information included on this permit application form is, to the best of my knowledge, correct and that the project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants wall be recorded,�nd that the proposed project complies with the requirements of 15A NCAC 2H.1001 � // 01 Signature: " v+� / Datc: �� . J� Form SWU-101 Version 3.99 Page 4 of 4 SIV Wo?Z3 IIOD State of North Carolina (to be provided by DWQ) Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT AI'PLICATTON FORIvi WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review:. A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. I. PROJECT IN-FORIk ON Project Name: - Cap Fear (%rnm inifiy Cn11 Pap Contact Person: rk N N�rQm�,P, P F Phone Number. (91() 1 7F2-4n For projects with multiple basins, specify which.basin this worksheet applies to: Pnnti U0 1 elevations Basin Bottom Elevation 21.50 ft. (floor of the basin) Permanent Pool EIevation 27.50 ft_ (elevation of the orifice) Temporary Pool Elevation _28 :'5 sr ft. (elevation of the discharge structure overflow) 4real Permanent Pool Surface Area 96.948 sq. fL (water surface area at the orifice elevation) Drainage Area 41.6 ac. (on -site and off -site drainage to the basin) [nipervious Area 29.12 ac. (on -site and off' -site drainage to the basin) volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DA1 Diameter of Orifice Design Rainfall Design TSS Removal'- 515 3u cu. fr. —; 04i55 cu ft. 105.Q41 cu.ft. 3.90 1 (combined volume of main basin and forebay) (volume detained above the permanent pool) (approximately 20% of total volume) (surface area to drainage area ratio from DWQ table) (2 to 5 day temporary pool draw -down required) (minimum 85% required) Fonn SWZ;-lot Rev 3.99 Page 1 of Y When using the Division SAIDA tables, the correct SAIDA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for non- standard table entries_ In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is designed to provide 90% TSS removal. The NCDE.ITR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal. II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Department Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supporting documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit Application Form, the agent -may initial below. If a requirement has not been met, attach justification. Applicants Initials 01EY a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). b. The forebay volume is approximately equal to 20% of the basin volume. mn% c. The temporary pool controls runoff from the -design storm event. —_ M V9 d. The temporary pool draws down in 2 to 5 days. 41L e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) MO f. The basin length to width ratio is greater than 3:1. A rid g. The basin side slopes above the permanent pool are no steeper than 3:1. ni,r} h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail), i. Vegetative cover above the permanent pool elevation is specified. InNY j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right- of-way. m IPA I. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. M,V# m. A mechanism is specified iyhich will drain the basin for maintenance or an emergency. tin d [J I t he ov,iy ed doN ei III. WET DETENTION BASIN OPERATION AND MAINTENANCE AGREEMENT The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. ` This system (check one) 0 does 'does not incorporate a vegetated filter at the outlet. This system (check one) 4 does ydoesnot incorporate pretreatment other than a forebay. Form SWL-102 Rev 3.99 Page 2 of Maintenance activities shall be performed as follows: 1. After every significant runoff producing rainfall event and at Ieast monthly: Pord 1 Revised 12/22/9, a. Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation; vegetated cover, and general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary Pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good veae cover to maintain a maximum height of six inches, d remove trash as eededtive cover, mow vegetative 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. y 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 15% of the original design depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will -not adversely impact wateruali (i.e. stockpiling near a wet detention basin or stream, etc.). q ty The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into ac ulated sediments. When the permanent pool V p 1 depth reads d _ 5 feet in the main pond, the sediment shall be removed. When the permanent pool depth reads 3.07feet tin the foreba y, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) V Permanent Pool Elevation —2Z.50 Sediment Re oval El. w, y ----- 75 -- Sediment Removal 00 Bottom Ele ation �40 ----- - 23. 75% Bottom Elevation -21-3D 25%, FOREBAY ' 11IAIN POND �. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These Plants shall be encouraged to grow along the vegetated shelf and forebay berm. i. If the basin must be drained for an emezgency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. :orm SWU-102 Rev 3.99 Page 3 -nFe, I acknowledge and agree by my signature t r below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to a changes to the system or responsible party. Print name: Eric B. Mkit w Title: R ESidA - M Address: 411 SM FrU t Strl Wilmington, KC 26V Phone: 910-251510 Signature. 11 Date: g 3 Note: The iegallyteSOMble party should not be a homeowners association unless more than 5040 of the Iots have been sold s a:resident of the subdivision has been named the president_ a Notary Public for the State of AB f /Z&ill6//1�. County of 4!/�J ; do hereby certify that �r//i C- Z . j personally appeared before me this day of 02i , _ !�� and ack.owledge the d execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official sea IM SEAL ivly commission expires_ �Ll�E-Q 36� aed l Form SW[J-102 Rev 3.99 pate .1 of A Permit No. 5W 7 � �0 9 2 2� State of North Carolina (to be provided by DW( Department of Environment and Natural Resources Revi sd 12/22/99 Division of Water Quality STOR&MATER MANAGEMENT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an orio nal DWQ Stormwater Management Plan Review A complete stormwater management plan submittal includes an application form, a wet detention basir supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. I. PROJEC37 Mdk TUON Project Name: __ CdDe Fedr Cann mit ,� Contact Person: Mark N. Hargrove, P. E. Phone Number. ( 910 ) 76)-4 For projects with multiple basins, specify which basin this worksheet applies to: Pond 2 elevations Basin Bottom Elevation 20.0 fL (floor of the basin) Permanent Pool Elevation 25.0 ft. (elevation of the orifice) Temporary Pool Elevation 25.80 ft. (elevation of the discharge structure overflow) areas Permanent Pool Surface Area 31,061 sq. ft. Drainage Area 9.20 ac. Impervious Area 6.44 ac. volumes Permanent Pool Volume `100,021 cu. ft. Temporary Pool Volume 25 732 cu. ft. Forebay Volume P 20.404 cu. ft. Other parameters SAMA1 Diameter of Orifice Design Rainfall Design TSS Removal' - (water surface area at the orifice elevation) (on -site and off -site drainage to the basin) (on -site and off -site drainage to the- basin) (combined volume of main basin and forebay) (volume detained above the permanent pool) (approximately 20% of total volume) _--5 , 0 (surface area to drainage area ratio from DWQ table) 2.0 in. (2 to S day temporary pool draw -down required) 1 in. 9O % (minimum 85% required) Form SNvti-102 Rev 3.99 p�Qy 1 of 11 VVLT1I1J11-J- 1 When using the Division SAIDA tables, the correct SAIDA ratio for permanent pool sizing should be computed based u on the actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for ne standard table entries. Z In the 20 coastal counties, the requirement for a vegetative filter may be waived if the wet detention basin is de signed to 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal. ro�ic II. REQUIRED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices Manu (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative CO( Section: 15 A NCAC 2H .1008. Initial in the space provided to indicate the following design requirements have been met and supportir documentation is attached. If the applicant has designated an agent in the Stormwater Management Perm Application Form,,..th&z ent may initial below. If a requirement has not been met, attach justification. Applicants Initials M JVA- a. The permanent pool depth is between 3 and 6 feet re o p (required minimum of 3 feet). mgi b. The forebay volume is approximately equal to 20% of the basin volume. m,v c. The temporary pool controls runoff from the design storm event. d. The temporary pool draws down in 2 to 5 days_ e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations) Al A;# f. The basin length to width'ratio is greater than 3:1. mti g. The basin side slopes above the permanent pool are no steeper than 3:1. h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). �r i. Vegetative cover above the permanent pool elevation is specified. ^0 j. A trash rack or similar device is provided for both the overflow and orifice. VA k. A recorded drainage easement is provided for each basin including access to nearest nigh of -way. 41 jv# 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. M N9 in. A mechanism is specifiedVhicp will drain the basin for maintenance or an emergency - he p v.",O e III. WET DETENTION BASIN OPERATION AND lti1A.I1'1TENANCE AGREETNIEN'T The wet detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one) 0 does ,B.does not incorporate a vegetated filter at the outlet. This system (check one) 0 does does not incorporate pretreatment other than a forebay. Form Sw11-in7 Rev ",Qo , � A rona z Maintenance activities shall be performed as follows: Revised 12/22/99 I. After every Significant runoff producing rainfall event and at Ieast monthly: a- Inspect the wet detention basin system for sediment accumulation, erosion, trash accumulation. vegetated cover, and ,general condition. b. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six, inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Removeaccumulated.-sediment from the wet detention basin system semi-annually or w reduced -to 75% of the original design depth (see diagram below). Removed sediment shall hen be depth is ed Of in an appropriate manner and shall be handled in a manner that will not adversely impact water uali (i.t. stockpiling near a wet detention basin or stream, etc.). q ' The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into ac urnulated sediments. When the permanent Pe pool 1 depth reads 3.75 feet in the main pond, the sediment shall be removed. When the , permanent pool depth reads 3.00 feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fi11 in the blanks) — L—v Pezmanent Pool Elevation 25.00 Sediment Re oval El. 22.00 75 ' ------ Sediment Re 21.25 Bottom Ele ation 21.00 qa m--- Elevation Bottom Elevation 20.00 _�_�- _25% FOREBAY RUN POND 5- Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. Form SWU-102 Rev 3.99 Page 3 of 4 l 1-UILI UIIrtttti or Ine wet aetennon oasin system shall be maintained in good workin- order. I acknowledge and agree by my signature below that I am responsible for the performance of 'the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any changes to the system or responsible party. Print name: Eric B. MJe1ft Title: P[MidA - CR)C Address: 411 Sdjt Frzrtt Str� WilrMngtM, (C 28V PhnnP- 910-25151M Si 3 Date: Note: The legally responsible party should not be a homeowners association unless more than 50% of the lots have been sold a resideu'i of the subdivision has been named the president and L 67 �` 5 a Notary Public for the State of/der L,6z' County of g M �'V,4/1AYCT , do hereby certify that personally appeared before me this Ace day of and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, SEAL My commission expires Form SW -tn2 Re- 3.99 r-...e Permit No. (to be provided by DWO, State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORIVIWATER MANAGE'yffiNT PERMIT APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form may be photocopied for use as an original DWO Stormwater Management Plan Review A complete stormwater management plan submittal includes an application form, a wet detention basin supplement for each basin, design calculations, and plans and specifications showing all basin and outlet structure details. I. PROJEC-T rgFORVATION Project Niine: Cape Fear Community Coll Contact Person: Mark Hargrove Phone Number. (910) 762-4200 For projects with multiple basins, specify which basin this worksheet applies to: Pond No. 3 elevations - Basin Bottom Elevation 19.5 ft, .Permanent Pool Elevation _ 25.00 (floor of the basin) ft. (elevation of the orifice) Temporary Pool Elevation '" 26.20 ft. (elevation of the discharge structure overflow) areas Permanent Pool .Surface Area Drainage Area Impervious Area volumes Permanent Pool Volume Temporary pool Volume Forebay Volume other parameters SA/DA' Diameter of Orifice Design Rainfall Design TSS Removal2 Footnotes: 260,854 99,795 59,461 sq• fL (water surface area at. the orifice elevation) ac. (on -site and off -site drainage to the basin) ac. (on -site and off -site drainage to the basin) cu. ft. (combined volume of main basin and forebay) cu. ft. (volume detained above the permanent pool). cu. ft. (approximately 20% of total volume) (surface area to drainage area ratio from, DWO table) (2 to 5 day temporary pool draw -down required) (minimum 85% required) When using the Division SAkA tables, the correct SA)bA ratio for permanent pool sizing should be computed based upon the actual impervious % and permanent pool depth. Linear interpolation should be employed to determine the correct value for nonstandard table entries. In the 20 coastaI counties, the requirement for a vegetative filter may be waived if the Bret detention basin is designed to provide 90% TSS removal. The NCDENR BVfP manual provides desi TSS removal. gn tables for both SS°fo TSS removal and 90% Form SWU-102 Rev;_99 .,; , II: REQURED ITEMS CHECKLIST The following checklist outlines design requirements per the Stormwater Best Management Practices ;Manual (N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code Section: 15 A NCAC 2H. 1008.. Initial in the space provided to indicate the following design requirements have been met and supporting documentation attached. If the applicant has deli is atcd an agent in the Stormwater Management Permit Application Form, the agent may initial below. If a requirement has not been met, attach justification. Applicants Initials M h;+- a. The permanent pool depth is between 3 and 6 feet (required minimum of 3 feet). b. The forebay volume is approximately equal to 20% of the basin volume. ►'.� i l c. The temporary pool controls runoff from the design storm event. I"A `The to mpotary pool draws down in 2 to S days.. e. If required, a 30-foot vegetative filter is provided at the outlet (include non -erosive flow calculations M 01i f. The basin length to width ratio is greater than 3: 1. rat ti i} g. The basin side slopes above the permanent pool are no steeper than 3: 1. tn Rd h. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). tnNl� I. Vegetative cover above the permanent pool elevation is specified. tti j. A trash rack or similar device is provided for both the overflow and orifice. k. A recorded drainage easement is provided for each basin including access to nearest right-of-way. 1. If the basin is used for sediment and erosion control during construction, clean out of the basin is specified prior to use as a wet detention basin. — 1.?G}� m• A mechanism is specified which will drain the basin for maintenance or an emergency. ,OA41iv; / j 6 e M. NVE'T DETENTION BASW OPERATION AND MALN. 7ENAI\ CE AGREEIN EIN-r The Bret detention basin system is defined as the wet detention basin, pretreatment including forebays and the vegetated filter if one is provided. This system (check one) O does does not incorporate a vegetated filter at -the outlet. This system (check one) O does Idoes not incorporate pretreatment other than a forebay. Form SNVU-102 Rev 3.99 Pave 2 of 4 Maintenance activities shall be performed as follows: After every significant runoff producing rainfall event and at least monthly: a. Inspect the. wet detention basin system for sediment accumulation, erosion, trash accumulation, vegetated cover, and general condition. h. Check and clear the orifice of any obstructions such that drawdown of the temporary pool occurs within 2 to 5 days as designed. 2. Repair eroded areas immediately, re -seed as necessary to maintain good vegetative cover, mow vegetative cover to maintain a maximum height of six inches, and remove trash as needed. 3. Inspect and repair the collection system (i.e. catch basins, piping, swales, riprap, etc.) quarterly to maintain proper functioning. 4. Remove accumulated sediment from the wet detention basin system semi-annually or when depth is reduced to 75% of the original di6sign depth (see diagram below). Removed sediment shall be disposed of in an appropriate manner and shall be handled in a manner that will not adversely impact water quality (i.e. stockpiling near a wet detention basin or stream, etc.). The measuring device used to determine the sediment elevation shall be such that it will give an accurate depth reading and not readily penetrate into accumulated sediments. When the permanent pool depth reads 4.13' feet in the main pond, the sediment shall be removed. When the permanent pool depth reads _ 3.0' feet in the forebay, the sediment shall be removed. Sediment Bottom _ 7 a 21.0 FOREBAY BASIN DIAGRAM (fill in the blanks) Permanent Pool Elevation j 25.0 Sediment Removal Elevation t 20.87 75 Bottom Elevation j 19.50 I ti46 MAIN POND 5. Remove cattails and other indigenous wetland plants when they cover 50% of the basin surface. These plants shall be encouraged to grow along the vegetated shelf and forebay berm. 6. If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain shall be minimized to the maximum extent practical. 7. All components of the wet detention basin system shall be maintained in good working order. Form SWLT-102 Rev 3.99 Page 3 of I ackowledge and agree by my signature below that I am responsible for the performance of the seven maintenance procedures listed above. I agree to notify DWQ of any problems with the system or p changes to the system or responsible party. nor to any Print name: Eric B. McKeithan Title: President - CFCC Address: 411 South Front Street, Wilmin Phone: (910) 362-7555 Date: — /bldo3 iw- Signature: NC 28401 Note: The le aiI re �' g Y SPonSible ,party should not be a homeowners association unless more than 50% of the lots have been sold and a resident of the subdivision has been named the president. I' -,-j �' ' �-t p C��— a Notary Public for the State of /UOR J County of IU_^J} Ij)O j /z do hereby certify that personally appeared before me this —a�N day of G e TO IS�/� a �3 and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and official seal, SEAL My commission expires _ 102 J . . Form SNVU-102 Rev- 3.99 Page 4 of 4 of WArFR s .. October 23, 2006 Carl Brown, Director of Institutional Services Cape Fear Community College 411 Front Street Wilmington, NC 28401-3910 Michael P. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources Project Name: CFCC North Campus Public Safety Training Center County: New Hanover County Project Number: SW8 990923 Mod. Dear Mr. Brown: Alan W. Klimek, P.E. Director Division of Water Quality Your recent stormwater•management permit application and check #3002090 for the $420.00 application fee are being returned because the application lacked the necessary basic elements to accept it for review. The plans and any other documentation that were submitted have been discarded or recycled, as appropriate. Please address the following noted deficiencies and provide the requested information: ® Previous project modifications were handled by submitting a revised page 2 of the application, which listed the BUA's for all of the permitted ponds. The built -upon area associated with the newest project is split out and added to the previously approved BUA as a separate item to facilitate permitting. There are currently 4 permitted wet ponds. If all of the built -upon area for the Public Safety Training Center is directed into Pond 4, then please revise the BUA's that are currently reported in 2 separate columns, into one column for Pond 4, to include the previously permitted 32,060 sq. ft. for the existing street, along with the information for the other 3 permitted ponds that are not changing. Report any leftover BUA as a "contingency amount" or "future development". ® Please report all built -upon area is square feet on the application. ® Only 2 sets of plans are required. Please do not waste your time, money and paper to send any more than that, as they take up too much room and will be recycled. ® Have you.replaced Eric McKeithan? He has usually been signing the stormwater applications. The rules are specific in who can sign the application. How does your position relate to the president or vice president of CFCC? Please resubmit the permit application package to the address below. Note that the 90-day statutory hermit review time begins upon receipt of a complete application, if you have any questions, please do not hesitate to call me at (910) 796-7335. Sincerely, -1 Linda Lewis Environmental Engineer cc: Steve Leimer, P.E., WK Dickson Linda Lewis ENB/arl: S:\WQS\STORMWATER\RETURN\990923.oct06 NorthCarolina )WA(rallry North Carolina Division of Water Quality 127 Cardinal Drive Extension • Wilmington, NC 28405 Phone (910) 796-7215 Customer Service Wilmington Regional Office Internet: www.ncwateroualitv.or- Fax (910) 350-2004 1-877-623-6748 An Equal Opportunity/Affirmative Action Employer — 50% Recycled/10% Post Consumer Paper 2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the Existing permit number N/A And its issue date (if known) N/A 3. Specify the type of project (check one): Low Density X High Density Redevelop General Permit Other 4. Additional Project Requirements (check applicable blanks): CAMA Major X Sedimentation/Erosion Control 404/401 Permit NPDES Stormwater Information on required state permits can be obtained by contacting the Customer Service Center at 1-877-623-6748. III. PROJECT INFORMATION 1 In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative (one to two pages) describing stormwater management for the project. Retention Ponds. 2. Stormwater runoff from this project drains to the Cape Fear River Basin. 3. Total Project Area: 14.48 AC 4. Project Built Upon Area: 85 % 5. How many drainage areas does the project have? 1 6. Complete the following information for each drainage area. If there are more than two drainage areas in the project, attach an additional sheet with the i�n ormatiot} for each area provided in the same format as below. 1/n rN A Cf Basin Information DraiAge Area 1 Drainage Area 2 Receiving Stream Name UT Prince George Creek Receiving Stream Class C Swam Drainage Area 630,632 SF / 14.48 AC Existing Impervious * Area 0 Proposed Impervious* Area 536,037 SF 112.30 AC % Impervious* Area (total) 85% Impervious* Surface Area Drainage Area 1 Drainage Area 2 On -site Buildings On -site Streets 32,060 SF / 0.736 AC On -site Parkin On -site Sidewalks Other on -site (Future) 503,977 SF / 11.570 AC Off -site 0 Total: 536,037 SF / 12.30 AC Total: v6u".3 u, — {S ueft.teu us nae oum upon area ineruaing, but not limited to, buildings, roads, parking areas sidewalks, gravel areas, etc. Form SWU-101 Version 3.99 Page 2 of 4 0 w In* aviz, -fb Y ,oft) 0rn Pords 1 �3 9 %WK DICKSON community infrastructure consultants October 13, 2006 Ms. Linda Lewis North Carolina Department of Environment and Natural Resourses Division of Water Quality 127 Cardinal Drive Extension Wilmington, North Carolina 28405 RE: Stormwater Management Permit Application A New Public Safety Training Center Cape Fear Community College, North Campus, New Hanover County, NC WKD Project No. 40155.00.WL Dear Ms. Lewis: On behalf of Cape Fear Community College (CFCC), we are submitting for your review and approval an application and support information for a Stormwater Management Permit for a new Public Safety Training Center at the CFCC North Campus in New Hanover County, NC. In summary, the project consists of constructing various training facilities that will be used by CFCC, New Hanover County, and the City of Wilmington for training their Fire, Police, and EMS personnel in all areas of public safety. The total disturbed area will be 11.38. The project will drain into an existing stormwater pond which was designed, permitted, and constructed to accept this flow under NCDENR Division of Water Quality Permit No. SW8 990923. Enclosed are: 1. One original and two copies of the Application Form 2. A check in the amount of $420 for the application fee. 3. Three copies of a Stormwater Narrative with calculations and the existing Stormwater Permit. 4. Three copies of the project Drawings. 5. Three copies of the following selected project Specifications: Section 02230 - Site Clearing Section 02310 -Excavation and Fill Section 02371 - Rip Rap Section 02374 Erosion and Sediment Control Section 02630 Storm Drainage Section 20633 Utility Manholes and Structures Section 02923 Landscaping Grading Section 02924 Seeding and Soil Supplements We look forward to your review and approval. Please return questions and correspondence to Daniel E. Dawson of our office. Thank you. Sincerely, & CWKDickson Inc. Steven D. Leimer. PE Enclosures as noted cc: Carl Brown, CFCC; Jim Stumbo, SCN Architects; Dan Dawson, WK 909 Market Street Wilmington, NC 28401 Tel. 910.762.4200 Fax 910.762.4201 www.wkdickson.com MAProjectslscnar�4015500WL%DocumentsV_Approvals\Stormwater PermiNtr Sw Appl_L Lewis.doc North Carolina • South Carolina • Georgia . Florida A� NCDENR North Carolina Department of Environment and Natural Resources Division of Land Resources James D. Simons, PG, PE !and Qualit`; Seotior. Michael F. Easley, Governor Director and State Geologist William G. Ross Jr., Secretary 10-18-06 LETTER OF RECEIPT OF EROSION CONTROL PLAN Cape Fear Community College Mr. Carl Brown, Director of Institutional Services 411 N. Front Street Wilmington, NC 28401-3910 RE: Project Name: Public Safety Training Center OCT B Z Project ID: Newha-2007-151 County: New Hanover, Cape Fear Township, 4500 Blue Clay Road River Basin: Cape Fear Submitted By: Carl Brown Date Received by LQS: October 18, 2006 Plan Type: NEW Dear Mr. Brown: This office has received a soil erosion and sediment control plan for the project listed above which was submitted as required by the North Carolina Sedimentation Pollution Control Act (G.S. 113A-57 (4)). The Act requires that all persons disturbing an area of one or more acres of land must obtain approval of a soil erosion control plan prior to the commencement of the land -disturbing activity (G.S. 11 3A-54(d) (4)). The Act further states that this plan must be filed a minimum of 30 days prior to the activity and the approving authority must approve or disapprove the submitted plan within 30 days of receipt. Failure of the approving authority to approve or disapprove the submitted plan within the 30-day period will be deemed approval of the plan. Commencement or continuation of a land -disturbing activity under the jurisdiction of this Act prior to the approval of an erosion and sediment control plan is a violation of the Act. We have performed a preliminary review of your submitted plan and have determined that additional information will be necessary before a final review can be completed. Enclosed is a checklist of items that must be submitted before we can complete the review process. Failure to provide the additional information may result in disapproval of your plan. The approval of an erosion and sediment control plan is conditioned on the applicants compliance with Federal and State water quality laws, regulations and rules. If you have questions please do not hesitate to conta this office. Your cooperation in this matter is appreciated and we look forward to working with you on this roject. Sincerely, W�_ Chastity N. Clark Assistant Regional Engineer cc: Steven D. Leimer, PE, W.K. Dickson & Co ... Inc. LQS-WiRO; SWS-WiRO Wilmington Regional Office 127 Cardinal Drive Ext., Wilmington, North Carolina 28405-3845 • Phone: 910-796-7215 / FAX: 910-350-2004 NORTH CAROLINA DEPARTMENT OF ENVIRONMENT & NATURAL RESOURCES LAND QUALITY SECTION EROSION and SEDIMENTATION CONTROL PLAN PRELIMINARY REVIEW CHECKLIST PROJECT NAME: Public Safety Training Center DATE: 10/18/2006 PROJECT NO.: Newha-2007-151 COUNTY: New Hanover To expedite the approval process, a cursory review of your submitted Erosion and Sediment Control Plan application has been made and has shown the need for additional information as specified below. To meet our review schedule, any additional information should be received by this office no later than November 6_,2006 . Failure to meet this schedule may result in disapproval of your plan. The following items shall be incorporated with respect to specific site conditions, in an erosion and sediment control plan: LOCATION INFORMATION Project location (roads, streets, landmarks) North arrow and scale GENERAL SITE FEATURES (Plan elements) Legend: North arrow, scale, etc. Property lines Existing contours (topographic lines) Proposed contours Limits of disturbed area (provide acreage total, delineate limits, and label) Planned and existing building locations and elevations Planned & existing road locations & elevations Lot and/or building numbers Geologic features: rock outcrops, seeps, springs, wetland and their limits, streams; lakes, ponds, dams, etc. Easements and drainageways Profiles of streets, utilities, ditchlines, etc. Stockpiled topsoil or subsoil locations If the same person conducts the land -disturbing activity & any related borrow or waste activity, the related borrow or waste activity shall constitute part of the land -disturbing activity unless the borrow or waste activity is regulated under the Mining Act of 1971, or is a landfill regulated by the Division of Waste Management. If the land -disturbing activity and any related borrow or waste activity are not conducted by the same person, they shall be considered separate land -disturbing activities and must be permitted either thru the Sedimentation Pollution Control Act as a one -use borrow site or through the Mining Act. Required Army Corps 404 permit and Water Quality 401 certification (e.g. stream disturbances over 150 linear feet) EROSION CONTROL MEASURES (on plan) Legend Location of temporary measures Location of permanent measures . Construction drawings and details for temporary and permanent measures Maintenance requirements of measures Contact person responsible for maintenance SITE DRAINAGE FEATURES Existing and planned drainage patterns (include off -site areas that drain through project) Method of determination of and calculations forAcreage of land being disturbed _ Size and location of culverts and severs Soil information: type, special characteristics Soil information below culvert storm outlets Name and classification of receiving water course (only where stormwater discharges are to occur) Comments: STORMWATER CALCULATIONS Pre -construction runoff calculations for each outlet from the site (at peak discharge points) Design calculations for peak discharges of runoff (including the construction phase & the final runoff coefficients of the site) Design calcs of culverts and storm sewers Discharge and velocity calculations for open channel and ditch flows (easement & right-of-ways) Design calcs of cross sections and method of stabilization of existing and planned channels (include temporary linings) Design calcs and construction details of energy dissipators below culvert and storm sewer outlets (diameters & apron dimensions) Design calcs and dimension of sediment basins Surface area and settling efficiency information for proposed sediment traps and/or basins VEGETATIVE STABILIZATION Area & acreage to be vegetatively stabilized Method of soil preparation Seed type & rates (temporary & permanent) Fertilizer type and rates Mulch type and rates NOTE: Plan should include provisions for groundcover on exposed slopes within 15 working days or 30 calendar days (whichever is shorter), following completion of any phase of grading; permanent groundcover for all disturbed areas within 15 working days or 90 calendar days (whichever is shorter) following completion of construction or development. FINANCIAL RESPONSIBILITY/OWNERSHIP FORM Completed, signed & notarized FR/O Form Accurate application fee ($50.00 per acre rounded up the next acre with no ceiling amount) Certificate of assumed name, if the owner is a partnership Name of Registered Agent (if applicable) Copy of the most current Deed for the site NOTE: For the Express Permitting Option, inquire at the local RegionalOffice for availability. NARRATIVE AND CONSTRUCTION SEQUENCE Narrative describing the nature and purpose of the construction activity Construction sequence related to erosion and sediment control(including installation of critical measures prior to the initiation of the land -disturbing activity & removal of measures after areas they serve are permanently stabilized) Bid specifications related only to erosion control Newha-2007-151 Continuation of Erosion and Sedimentation Control Plan Preliminary Review Checklist: 1. Provide Details of all Energy Dissipaters 2. Clarify the Limits of Disturbance 3. Provide a Locator Map on plan sheet 4. As of January 13t 2007 A. The department is discouraging the block and gravel inlet protection because of the limited surface area for flow discharge B. Steel posts are required for all silt fence designs C. Sediment storage = 3600 cubic feet per acre of disturbance 5. Inadequate sediment storage for 12 acres of land disturbance 6. Provide cross-section details for all applicable ditches within the limits of disturbance 7. Provide location and erosion & sediment control measures for all stockpiles on plans. Wilmington Regional Office 127 Cardinal .Drive Extension, Wilmington, NC 28405 Phone: 910-395-3900 Fax: 910-350-2004 l�►WK V DICKSON community infrastructure consultants November 13, 2006 Ms. Linda Lewis North Carolina Department of Environment and Natural Resources Division of Water Quality 127 Cardinal Drive Extension Wilmington, North Carolina 28405 o C�r 1� I--, � 5w� RE: Revised Stormwater Management Permit Application Public Safety Training Center Cape Fear Community College, North Campus, New Hanover County, NC DWQ Project No. SW 990923 Mod WKD Project No. 40155.00.WL Dear Ms. Lewis: Thank you for your review of the application for a Stormwater Management Permit for the Public Safety Training Center at the CFCC North Campus in New Hanover County, NC. Enclosed is a revised application including: 1. One original and one copy of the revised Application Form signed by Dr. McKeithan. 2. A check in the amount of $420 for the application fee. 3. Two copies of a Stormwater Narrative with calculations and the existing Stormwater Permit. 4. Two copies of selected project Drawings: 2.01-General Notes, 2.02-Existing Conditions, 2.06-Grading Plan, 2.07-Drainage Plan, 2.09- Erosion Control Plan, 2.10 and 2.11-Cross Sections, and 2.12-Stormwater Details 5. Two copies of the following selected project Specifications: Section 02230 - Site Clearing Section 02310 - Excavation and Fill Section 02371 Rip Rap Section 02374 - Erosion and Sediment Control Section 02630 Storm Drainage Section 20633 - Utility Manholes and Structures The project consists of constructing various training facilities that will be used by CFCC, New Hanover County, and the City of Wilmington for training their Fire, Police, and EMS personnel in all areas of public safety. The project will drain into an existing stormwater pond which was designed, permitted, and constructed to accept this flow under NCDENR Division of Water Quality Permit No. SW8 990923. We look forward to your review and approval. Thank you. Sincerely, W. K. Dickson & Co., Steven D. Leimer, PE '�C NOV i 4 �oe� BY: -- - Enclosures as noted cc: Carl Brown, CFCC; Jim Stumbo, SCN Architects; Dan Dawson, WKD; Denise Freund, WKD. 909 Market Street Wilmington, NC 28401 Tel. 910.762.4200 Fax 910.762.4201 www.wkdickson.com M:\Projects\scnark4015500WL\DocumentsU_Approvals\Stormwater Permit\ltr_SW Appl_L Lewis.doc North Carolina • South Carolina • Georgia . Florida