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HomeMy WebLinkAboutSW8001009_HISTORICAL FILE_20030902 (2)STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW8 Cw)\D0 I DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS ® HISTORICAL FILE ❑ COMPLIANCE EVALUATION INSPECTION DOC DATE 20a3 01)02 YYYYMMDD WATER � —i Michael F. Easley, Governor William G. Ross Jr., Secretary North Carolina Department of Environment and Natural Resources September 2, 2003 Mr. Rick Blacher Smith Creek Storage Facilities, Inc. 5633 Market Street Wilmington, NC 28405 Dear Mr. Blacher: Alan W. Klimek, P.E.,Director Division of Water Quality Coleen H. Sullins, Deputy Director Division of Water Quality Subject: Stormwater Permit No. SW8 001009 Mod. Smith Creek Storage Facilicities Phase I High Density Project New Hanover County The Wilmington Regional Office received a complete, modified Stormwater Management Permit Application for Smith Creek Storage Facilities Phase I on July 17,2003. 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 001009 dated September 2, 2003, for the construction of the subject project. This permit shall be effective from the date of issuance until September 2, 2013, and shall be subject to the conditions and limitations as specified therein. Please Pay special attention to the Operation and Maintenance requirements in this permit. Failure to establish an adequate system for operation and maintenance of the stormwater management system will result in future compliance problems. If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an adjudicatory hearing upon written request within thirty (30) days following receipt of this permit. This request must be in the form of a written petition, conforming to Chapter 150B of the North Carolina General Statutes, and filed with the Office of Administrative Hearings, P.O. Drawer 27447, Raleigh, NC 27611- 7447. Unless such demands are made this permit shall be final and binding. If you have any questions, or need additional information concerning this matter, please contact Linda Lewis, or me at (910) 395-3900. Sincerely, Rick Shiver J Water Quality Regional Supervisor RSS/arl: S:\WQS\STORMWAT\PERMIT\001009.sep03 cc: Jim Honeycutt, P.E. Tony Roberts, New Hanover County Building Inspections Beth E. Wetherill, New Hanover County Engineering Linda Lewis Wilmington Regional Office Central Files N. C. Division of Water Quality 727 Cardinal Drive Extension (910) 395-3900 Customer Service e�n Wilmington Regional Office Wilmington, NC 28405 (910) 350-2004 Fax 1 800 623-7748 NCDENR State Stormwater Management Systems Permit No. SW8 001009 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 Rick Blacher, Smith Creek Storage Facilities, Inc. Smith Creek Storage Facility, Phase 1 New Hanover County FOR THE construction, operation and maintenance of a wet detention pond in compliance with the provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules') and the approved stormwater management plans and specifications and other supporting data as attached and on file with and approved by the Division of Water Quality and considered a part of this permit. This permit shall be effective from the date of issuance until September 2, 2013, and shall be subject to the following specified conditions,and limitations: I. DESIGN STANDARDS This permit is effective only with respect to the nature and volume of stormwater described in the application and other supporting data. This stormwater system has been approved for the management of stormwater runoff as described on page 3 of this permit, the Project Data Sheet. The stormwater control has been designed to handle the runoff from 111,929 ft square feet of impervious area. 3. The tract will be limited to the amount of built -upon area indicated on page 3 of this permit, and per approved plans. 4. All stormwater collection and treatment systems must be located in either dedicated common areas or recorded easements. The final plats for the project will be recorded showing all such required easements, in accordance with the approved plans. 5. The runoff from all built -upon area within the permitted drainage area of this project must be directed into the permitted stormwater control system. A permit modification must be submitted and approved prior to the construction of additional built -upon area from outside of the approved drainage area. State Stormwater Management Systems Permit No. SW8 001009 Modification DIVISION OF WATER QUALITY PROJECT DESIGN DATA SHEET Project Name: Permit Number: Location: Applicant: Mailing Address: Application Date: Receiving Stream/River Basin Stream Index Number: Classification of Water Body: Drainage Area, cres: Onsite, f : Offsite, ft2: Total Impervious Surfaces, ft2: Pond Depth, feet: TSS removal efficiency: Permanent Pool Elevation, FMSL: Permitted Surface Area, ft2: Permitted Storage Volume, ft3: Temporary Storage Elevation, FMSL Controlling Orifice: Permitted Forebay Volume, ft3: Smith Creek Storage Facility Phase I SW8 001009 Mod. New Hanover County Mr. Rick Blacher Smith Creek Storage Facilities, Inc. 5633 Market Street Wilmington, NC 28405 July 17, 2003 Spring Branch / Cape Fear CPF17 18-74-63-1 "C Sw" 3.64 3.64 0 111,929 6.5 90% (no filter is required) 24.00 6,603@Permanent Pool 10,159 25.37 1.5'"0 pipe (drawdown in 2-5 days) 3,018 9 State Stormwater Management Systems Permit No. SW8 001009 Modification II. SCHEDULE OF COMPLIANCE The stormwater management system shall be constructed in it's entirety, vegetated and operational for its intended use prior to the construction of any built -upon surface. During construction, erosion shall be kept to a minimum and any eroded areas of the system will be repaired immediately. 3. The permittee shall at all times provide the operation and maintenance necessary to assure the permitted stormwater system functions at optimum efficiency. The approved Operation and Maintenance Plan must be followed in its entirety and maintenance must occur at the scheduled intervals including, but not limited to: a. Semiannual scheduled inspections (every 6 months). b. Sediment removal. C. Mowin,9 and revegetation of slopes and the vegetated filter. d. Immediate repair of eroded areas. e. Maintenance of all slopes in accordance with approved plans and specifications. f. Debris removal and unclogging of outlet structure, orifice device, flow spreader, 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. 5. Decorative spray fountains will not be allowed in the stormwater treatment system. 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. A modification may be required for those deviations. 8. If the stormwater system was used as an Erosion Control device, it must be restored to design condition prior to operation as a stormwater treatment device, and prior to occupancy of the facility. 9. At least 30 days prior to the sale or lease of any portion of the property, the permittee shall notify DWQ and provide the name, mailing address and phone number of the purchaser or leasee. 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 or lease of any portion of the property. rd State Stormwater Management Systems Permit No. SW8 001009 Modification 10. The permittee shall submit to the Director and shall have received approval for revised plans, specifications, and calculations prior to construction, for any modification to the approved plans, including, but not limited to, those listed below: a. Any revision to any item shown on the approved plans, including the stormwater management measures, built -upon area, details, etc. b. Project name change. C. Transfer of ownership. d. Redesign or addition to the approved amount of built -upon area or to the drainage area. e. Further subdivision, acquisition, or sale of all or part of the project area. The project area is defined as all property owned by the permittee, for which Sedimentation and Erosion Control Plan approval or a CAMA Major permit was sought. f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan. 11. The permittee shall submit final site layout and grading plans for any permitted future areas shown on the approved plans, prior to construction. If the proposed BUA exceeds the amount permitted under this permit, a modification to the permit must be submitted and approved prior to construction. 12. A copy of the approved plans and specifications shall be maintained on file by the Permittee for a minimum of ten years from the date of the completion of construction. 13. The permittee must maintain compliance with the proposed built -upon area and ensure that the runoff from all the built -upon is directed into the permitted system. 14. 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. 15. The permittee must maintain the current permitted drainage area. No additional runoff from outside of the permitted drainage area boundary may enter the permitted stormwater facilities without first applying for and receiving a permit modification. III. GENERAL CONDITIONS This permit is not transferable except after notice to and approval by the Director. In the event of a change of ownership, or a name change, the permittee must submit a formal permit transfer request to the Division of Water Quality, accompanied by a completed name/ownership change form, documentation from the parties involved, and other supporting materials as may be appropriate. 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 request. 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. 5 State Stormwater Management Systems Permit No. SW8 001009 Modification 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 during normal business hours 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. Unless specified elsewhere, permanent seeding requirements for the stormwater control must follow the guidelines established in the North Carolina Erosion and Sediment Control Planning and Design Manual. 8. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the permit.' 9. The permittee shall notify the Division any name; ownership or mailing address changes within 30 days. Permit issued this the 2nd day of September, 2003. NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION +.7Alan W. Klimek, P.E., Director Division of Water Quality By Authority of the Environmental Management Commission N State Stormwater Management Systems Permit No. SW8 001009 Modification Smith Creek Storage Facility Phase I Stormwater Permit No. SW8 001009 Modification New Hanover County Designer's Certification I, , as a duly registered in the State of North Carolina, having been authorized to observe (periodically/ weekly/ full time) the construction of the project, (Project) for (Project Owner) hereby state that, to the best of my abilities, due care and diligence was used in the observation of the project construction such that the construction was observed to be built within substantial compliance and intent of the approved plans and specifications. The checklist of items on page 2 of this form is included in the Certification. Noted deviations from approved plans and specification: Signature Registration Number Date SEAL 7 State Stormwater Management Systems Certification Requirements: Permit No. SW8 001009 Modification ' 1. The drainage area to the system contains approximately the permitted acreage. 2. The drainage area to the system contains no more than the permitted amount of built -upon area. 3. All the built -upon area associated with the project is graded such that the runoff drains to the system. 4. All roof drains are located such that the runoff is directed into the system. 5. The outlet/bypass structure elevations are per the approved plan. 6. The outlet structure is located per the approved plans. 7. Trash rack is provided on the outlet/bypass structure. 8. All slopes are grassed with permanent vegetation. 9. Vegetated slopes are no steeper than 3:1. 10. The inlets are located per the approved plans and do not cause short- circuiting of the system. 11. The permitted amounts of surface area and/or volume have been provided. 12. Required drawdown devices are correctly sized per the approved plans. 13. All required design depths are provided. 14. All required parts of the system are provided, such as a vegetated shelf, and a forebay. 15. The required system dimensions are provided per the approved plans. cc: NCDENR-DWQ Regional Office Tony Roberts, New Hanover County Building Inspections 3 'Y --11-6Y I Z 1_ 0. w_ 371, State of North Carolina Department of Environment and Natural- Resources DEC 11/ 2002 Division of Water Quality IV -kV- OQ 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): R I C K A LA C H E12 SYnikh Cxeel� SiCr�G� F2Cl I I+i e5. Sn< 2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance): SICK i3LACyGE- 0cUrJ0?_ 3. M ailing Address for person listed in item 2 above: 5633 C� mARKE-T STREET City: W I L W, IJ G T0N _ State: N C zip: �2 R 40 5 Ti lephone Number: (- "NO 1'79 9— 5 g 3 3 4. Project Name (subdivision, facility, or establishment name -should be consistent with project name on pl ins, specifications, letters; operation -and maintenance agreements, etc.): 51-T1 I TH CREEK STOkA6E FAC.IUT165, 11vC. —Pk. i 5. li cation of Project (street address): _ SEl2\)1CC 2pAO II13" OFF MAOC r STP-EeT City: W I L-fY)1 rJG TON County. NEW N I-i7JOJ E_P_ 6. Dt rections to project (from nearest major intersection): TP,AJEL rJ02Trl OrJ MA2KET S72ELi , CaOSS 5m 1Trl C,2_EL=IC PA2�_WAY, _TU2n4 c-EFT oN SE —VICE 1CoA-0—P"Pl-- -r1 ON 21GHT AC20S5 Flom LU1L,rmt\)nTu1,J A-UrO FrNiSHES 7. I.- titude: Longitude: of project 8. C• intact person who can answer questions about the project: Mime: R 1 CK R A C HE-Z Telephone Number: ( 9 10 ) � � ul —s �� 33 II. PERMIT INFORMATION: 1. SI•ecify whether project is (check one): New Renewal Modification Form:>WU-101 Version3.99 Page Iof4 2; If this appiicaBon is being submitted as the result of a renewal or modification to an existing permit, list the ex ,ling permit number S UPS n O 10 O `j and its issue date (if known) 2 O 3. Sp!cify the type of project heck one): _ _Low Density High Density _Redevelop _General Permit _Other 4. Ac!ditional Project Requirements (check applicable blanks): — CAMA Major _Sedimentation/Erosion Control _404/401 Permit. _NPDES Stormwater Im Drmation on required state permits can be obtained by contacting the Customer Service Center at 1-1' 77-623-6748. 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 . QJEr Poi -JD 2. Stormwater runoff from this project drains to the CA P E F1:1 Q, River basin. 3. Total Project Area: 3 , 0+ acres 4. Project Built Upon Area: % TbTAt SITE (0.54- Ac2E5 PHA ONE, 5. H, -w 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 an additional sheet with the information for each area provided in the same format as below. r PHAse: I (— PHASE Z- FUTu2-E Bas to7omtah Drazn' eAread Drama eArea2y G Receh ing Stream Name NCH S PQ.1 QG S 2.A n1GH Receh'ing Stream Class Drains ge Area is 13 1 5S 912 (P 4 -7 U Existing Impervious* Area NI ANIA Pro o::ed Im ervious'Area , ,5 7 A C(LE S Fu-r u (?- To Im ervious' Area (total) 91 F U Tu M ,.ramer�rious�,,SurfaEerArea�,`�.. On -site Buildings qQ 3 FU-ru (LE On -site Streets 1A — Tu 2 E On-sw! Parking F u p-E On-srf! Sidewalks , 410 FU Tu ZE, Other on -site N A I F td TO r?_ = Off -sir rJ 1 A 1 1 A Total: 1. 9;?Cl ITotal: ' 1 npervious area is defined as the built upon area including, but not limited to, buildings, roads, parking areas, sidewalks, gravel areas, etc. Form! WU-101 Version 3.99 Page 2 of 4 7. How was the off -site impervious area listed above derived? IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS The f( Howing italicized deed restrictions and protective covenants are required to be recorded for all subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table fisting each lot number, size and the allowable Built -upon area for each lot must be provided as an attach ment. 1. T x following covenants are intended to ensure ongoing compliance with state stormwater management permit member as issued by the Division of Water Quality. These covenants may ni t be changed or deleted without the consent of the State. 2. N ) more than squarefeet of any lot shall be covered by structures or impervious materials. Ix !pervious materials include asphalt, gravel, concrete, brick, stone, slate or similar material but do not include wood decking or the water surface of swimming pools. 3. S: mles shall not be filled in, piped, or altered except as necessary to provide driveway crossings. 4. Bu It -upon area in excess of the permitted amount requires a state stormwater management permit modification prior to cr nstruction. 5. A;1 permitted runoff from outparcels or future development shall be directed into the permitted stormwater control sn stem. These connections to the stormwater control system shall be performed in a manner that maintains the in tegrity and performance of the system as permitted. By yo it signature below, you certify that the recorded cleed restrictions and protective covenants for this project shallnclude all the applicable items required above, that the covenants will be binding on all parties and perso is 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 i 1MP specified for this project. Contact the Stormwater and General Permits Unit at (919) 733-5083 for the statLu and availability of these forms. Form SWU-102 Wet Detention Basin Supplement Form 5WU-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 5WU-108 Neuse Rivet Basin Supplement Form 5WU-109 Innovative Best Management Practice Supplement Form iiWU-10l Version 3.99 Paoe 3 of 4 Vl. SUBMITTAL REQUIREMENTS Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ). A com plete package includes all of the items listed below. The complete application package should be submilrted to the appropriate DWQ Regional Office. PI; ase indicate that you have provided the following required information by initialing in the space pr vided next to each item. • 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 • Ywo 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. kGENT AUTHORIZATION If you wish to designate authority to another individual or firm so that they may provide information on your behab . please complete this section. Desig: sated agent (individual or firm): H 0 N Ey C r TT t= rJ Ch I n1E Ef✓ I n1 C� [ n GYl P A N t Mailirg Address: P' 0. 60)( 150 3(0 City:_ W I Urn I n)C9 To tJ State: N C� Zip: of p +0 Phone: ( 910 ) 350-DC03I Fax: ( 910 ) 350-2031 VIIL APPLICANT'S CERTIFICATION f� I, (prii, t or type name of person listed in General Information, item 2) certify that the information included on this permit application form is, to the best of my knowledge, correct and that tl a project will be constructed in conformance with the approved plans, that the required deed restrictions and protective covenants will be recorded, and that the proposed project complies with the requirements of 15A NCAt: 2H .1000� Z /Signature: Xd/ C��Date: Form'iWU-101 Version 3.99 Page 4 of 4 Permit No. DOP09 /�±Z (to be provide I 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 rmd outlet structure details. I. PROJECT INFORMATION Project Name: S M 1 TH C Z�K- 5To►2Ar, E FA-0 a T1 ES I NC Contact Person: R I C. K Q LACHEP Phone Number: (910) r7 cl9 -5 4- 3 3 For projects with multiple basins, specify which basin this worksheet applies to: elevations Basin Bottom Elevation 1%. 50 ft. Permanent Pool Elevation '9' 4 - (X) ft. Temporary Pool Elevation IQ51 3'7 ft. (floor of the basin) (elevation of the orifice) (elevation of the discharge structure overflow) areas Permanent Pool Surface Area (P 6 03 sq. ft. (water surface area at the orifice elevation) Drainage Area 3 . (0 Lf ac. (on -site and off -site drainage to the basin) Impervious Area volumes Permanent Pool Volume Temporary Pool Volume Forebay Volume Other parameters SA/DAt Diameter of Orifice Design Rainfall Design TSS Removal 2 Form SWU-102 Rev 3.99 n , S'l ac. (on -site and off -site drainage to the basin) '1 a cu. it. (combined volume of main basin and forebay) cu. ft. (volume detained above the permanent pool) 3 0 ► S cu. ft. (approximately 20% of total volume) 0 3 I (surface area to drainage area ratio from DWO table) 1.5 in. (2 to 5 day temporary pool draw -down required) in. 90 % (minimum 85% required) Page 1 of 4 Footrotes: When using the Division SA/DA tables, the correct SA/DA 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 valve 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 io provide 90% TSS removal. The NCDENR BMP manual provides design tables for both 85% TSS removal and 90% TSS removal. H. 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 Administra€ive 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 justificf:tion. 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. �L/m e. If required, a 30-foot vegetative filter is provided at the outlet (include non-ero!.ive flow calculations) 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 _ It. A submerged and vegetated perimeter shelf with a slope of 6:1 or less (show detail). Vegetative cover above the permanent pool elevation is specified. 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. m. Amec gnism is specified which will drain the basin for maintenance or an emergency. 1 �Ce IP4 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 This system (check one) 0 does _/does not incorporate a vegetated filter at the outlet. `td does not incorporate pretreatment other than a forebay. Form SWU-l02 Rev 3.99 Page 2 of 4 �k. N 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 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 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 accumulated sediments. When the permanent pool depth reads t , 91)S feet in the main pond, the sediment shall be removed. When the permanent pool depth reads ` , 9�s feet in the forebay, the sediment shall be removed. BASIN DIAGRAM (fill in the blanks) 0 Permanent Pool Elevation a 4 00 Sediment Re oval El.- I Li.1 Z_ -75 ci 12 -------------- Sediment Removal Elevation Bottom Ele ation 17, 5 0 %--------------------------------------------- ------ Bottom Elevation J25% 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. 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 S W U• 102 Rev 3.99 Page 3 of 4 _ 7. All components of the wet detention basin system shall be maintained in good working 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 !,✓y ��! Address S`��S'i .f%I��r� sj' �/�n%r�✓�jv� %�/C 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 . 11n liLl. /,01) CM a Notary Public for the State of LL CCU �LLko - County of 9r 1 /,l2ndaf ceQ , do hereby certify that LA e OL ° , 0 CVo.e, personally appeared before me this c,�; day of 0 c r o in lco Y-- , Rc)oa , and acknowledge the due execution of the forgoing wet detention basin maintenance requirements. Witness my hand and offit:ial seal, SEAL My commission expires vl 1 UOJ` Form SWU-102 Rev 3.99 Pave 4 of 4 Entity Names http://www.secretary.state.nc.us/Corporations/soskb/Cor... North Carolina Elaine F. Marshall DEPARTMENT OF THE Secretary SECRETARY OF STATE Corporations *Corporations Home *Important Notice *Corporate Forms *Corporations FAQ °Tobacco Manufacturers °Verify Certification *Online Annual Reports Links °Secretary Of State Home °Business License *Register for E-Procurement *Dept. of Revenue Legislation 01999 Senate Bills 02001 Bill Summaries *Annual Reports 1997 *Corporations 1997 °Other Legislation Search °By Corporate Name °For New Corporation *By Registered Agent Online Orders °Start An Order °New Payment Procedures PO Box 29622 Raleigh, NC 27626-0622 (919. 07-2000 Date: 9/3/2003 Document Filings Print Entity Report Corporation Names Name Name Type NC Smith Creek Legal Storage Facilities, Inc. Business Corporation Information SOSID: Status: Date Formed: Citizenship: State of Inc. Duration: Registered Agent Agent Name: Registered Office Address: Registered Mailing Address: Principal Office Address: Principal Mailing Address: 0659868 Current -Active 1/15/2003 Domestic NC Perpetual Blacher, Richard 5633 Market Street Wilmington NC 28405 5633 Market Street Wilmington NC 28405 209 Quilon Circle Wilmington NC 28412 209 Quilon Circle Wilmington NC 28412 File Your Online Annual Report For questions or comments about the North Carolina Secretary of State's web site, please send e-mail to Webmaster. For questions or comments concerning the Corporations Division, please send e-mail to Corporations Administrator I of 2 9/3/2003 8:06 AM STATE OF NORTH CAROLINA DEPARTMENT OF THE SECRETARY OF STA STATEMENT OF CHANGE OF REGISTERED OFFICE AND/OR REGISTERED AGENT SOSID: 0659868 Date Filed: 5/19/2003 12:18:00 PM Elaine F. Marshall North Carolina Secretary of State C20031331N11164 Pursuant to §55D-31 of the General Statutes of North Carolina, the undersigned entity submits the following for the purpose of changing its registered office and/or registered agent in the State of North Carolina. INFORMATION CURRENTLY ON FILE The name of the entity is: Smith Creek Storage Facilities, Inc. Entity Type: ®Corporation, Foreign Corporation, []Nonprofit Corporation, OForcign Nonprofit Corporation, rLimitcd Liability Company, ❑Foreign Limited Liability Company ❑Limited Partnership, []Foreign Limited Partnership, ❑Limited Liability Partnership, []Foreign Limited Liability Partnership The street address and county of the entity's registered office currently on file is: Number and Street: 209 Ouilon Circle City, Slate, Zip Code: Wilmington. NC 28412 County: New Hanover The mailing address Ifdifferent from the street address of the registered office currently on file is: The name of the current registered agent is: Richard Blacher NEW INFORMATION I. The street address and county of the new registered office of the entity is: (complete this item only if the address of the registered office is being changed) Number and Street: 5633 Market Street City, State, Zip Code: Wilmington. NC 28405 County: New Hanover 2. The mailing address if different from the street address of the new registered office is: (complete this item only if the address of the registered office is being changed) 3. The name of the new registered agent and the new agent's consent to appointment appears below: (complete this item only if the name of the registered agent is being changed) or Print Name of New Agent Signature & Title 4. The address of the entity's registered office and the address of the business office of its registered agent, as changed, will be identical. 5. This statement will be effective upon filing, unless a date and/or time is specified: This is the -day of t'la,s T 20 o 3 . d 1 Tye_ !Signature /T rt.Itnra V�ar�P/ Ire SivV�r Type or Print Name and Title Notes: Filing fee Is $5.00. This document must be riled with the Secretary of State. • Insltad or signing here, the new registered agent may sign a separate written consent to the appointment, which must be attached to this statement. CORPORATIONS DIVISION P. O. BOX 29622 RALEIGH, NC 27626-0622 Revised January 2002 Form BE-06 SMITH CREEK STORAGE FACILITIES, INC. 5665 MARKET STREET REVISED NARRATIVE ON STORMWATER MANAGEMENT A permit modification is being submitted because the owner decided to make one of the buildings smaller and change the name of the business to Smith Creek Storage Facilities, Inc. The impervious areas on the drawing and the application have been changed to reflect this. The pond has been revised to its original design and we have shown the new layout. The calculations have been revised to show that the orifice will draw down the P volume in 2-5 days. RECEIVED JUL 17 2003 DWQ ,�/� PROJ # e %FQQ1� HOZ// 1 • . �� .. 5 . �.f./ �a • �..4 �� un. < .., � l I 1 a e .. .I .. l�. 1� �J, rer rl:. t (.:� :I � .r. . .. ... ... t . t r• �I. � .. :I: � t . ... .. ... .. :. . r.. r. .. 1 e r t. � , .... !. .. '. . .... ... / .. �I. .. .. :I11 �: ... r. .. .. r .. 1 .. .r.. ... ...t ..� .•�' ... r: �. .. .. '1: HONEYCUTT ENGINEERING CO. CONSULTING ENGINEERS 610 HIDDEN VALLEY ROAD WILMINGTON, NC 28409 910-350-0631 July 14, 2003 North Carolina Department Environment and Natural Resources Division of Water Quality ATTN: Linda Lewis Re: Stormwater Project No. SW8 001009 Smith Creek Storage Facilities, Inc. New Hanover County Dear Linda: I am addressing your comments as follows: 7 2003 1. We agree with your suggestion that the orifice draws down the 1" volume in the 2-5 days so we should change the pond back to its original design. Thanks. 2. All references to phase 2 have been deleted for clarity. The proposed BUA does not exceed what was assigned on the original permit. If you have any questions regarding this project, please give us a call. Sincerely, Qe0.0�►J Wendy Ric ardson �: F} .. .. •_ � ✓ _'y __ is C, '= E. {-' to � — .. '.� _- =. ,.. i _- u -.. i` _ :_ V I .� „i P � -_ — < <� — q+ .� _ �. _ .C1 � .c -_ L' x .-� _ .. � ..- � . .i' __ . Project 00-004 284925 Asite 43560 Atotal = Asite 158449 Al := 43560 79179 Alpaved;= 43560 410 Alside:= 43560 32340 Albldg 43560 Drainage Calculations for Smith Creek Storage Facilities Asde = 6.541 Atotal = 6.541 Al = 3.6375 A1paVed = 1.818 Al side= 0.009 Al bldg = 0.742 Revised 7114/03 acres ...total area acres acres - Phase 1 ...total drainage area acres ...paved area phase 1 acres ... sidewalk areas phase 1 acres ....building area phase 1 Page 1 Al imp Al paved + Al side Alimp = 1.827 acres - total impervious area excl. bldgs phase 1 Al other := Al - Al imp - Albldg A1aher = 1.068 phase 1 Cpfe:= .30 ... pre -development C RECEIVED �y e/ TT E Cimp := .95 ...paved area C Cbldg E1.00 C1 1CPre- (Alother)+C (An )+c (!Al�)bldJUL 17 2003 camp= Al imp Al Wdg 1I DWQ ,�l Clcomp = 0.77 ... phase 1 composite C (post -development) PROD # L:= 710 ft ...hydraulic length H:= 15ft ...height W. CH/=OPOFESS/O �/9''. 9 T° 128 ` *SEAL Tc = 5A1 ...time of concentration Intensity -Duration -Frequency Relationships: Values of G and H' R G H 10 252 30 50 338 33 R= Return Period 'Source: Master Drainage Plan for City of Wilmington r 0 Page 2 T Tc G10:= 252 H10:= 30 G10 110. H10+T G50:= 338 G50 150 H5o+T Time of duration 110 = 7.12 in/hr H50:= 33 150 = 8.8 in/hr Compute runoff rates: Qpre = Cpre*110*(Atotal) Qpre = 13.96 cfs Q1pre = Cpre-110•(Al) Q1pfe= 7.77 cfs Q1to Clcomp-110-(A1) Q110= 19.92 cfs Q150:= Clcomp•150•(A1) ...10 year storm intensity ...50 year storm ...total pre -development runoff from 10 yr. storm ...phase 1 pre -development runoff from 10 yr. storm ...phase 1 post -development discharge rate to pond from 10 yr. storm Q150 = 24.63 cfs ...phase 1 post -development discharge rate to pond from 50 yr. storm Volume of runoff from developed area of site: 1111IMI[IM CN := 76 Curve No. 1000 S := CN -10 S = 3.158 (P - 0.2.S)2 Rdepth �= Rdepth = 2.372 in. ...runoff depth P+.8-S Rlvol 1 Rdepth.(A1)-43560- 12 R1vol = 31316 cubic feet ...phase 1 runoff volume Rdepth-(Al) 1 1 T1p 1.39 1110 (T2).43560 60 Tip = 18.85 ...time to peak flow phase 1 Page 3 PHASE 1 POND: Determine size of pond without vegetative filter: depth := 6.5 ft A1imp + A1bldg IMP% := IMP% = 0.7064 Al IMP%70= .034 IMP%80:= .040 i := 0.. 1 xi Vy, •_ 0 IMP%70 0 IMP%80 V)q)q IMP: linterp(vx, vy, IMP%.100) IMP = 0.034384 DA :_ (Al) •43560 SAfeq = (IMP) -DA SAreq = 5448 sq.ft. ...Required surface area slopel := 6 ...min. slope of shelf slopel := 2.5 ...min. slope of pond below shelf shelf := 2 ft. ...depth of shelf w :_ (depth - shelf)-slope2.2 + shelf-slopel .2 w = 46.5 ...minimum width of permanent pool w := w ft. - width chosen w = 46.5 ft. 1:= 3•w I = 139.5 ft. ...min. length of permanent pool 1142 ft. - length chosen �prov I-w SAprov = 6603 ...sq.ft. of surface area provided must be SAreQ = 5448 Determine storage volume required for treatment of first inch of runoff: C1oomp = 0.769 V 12.(A1)-43560•C1comp V = 10159 cubic feet of storage required sq.ft. Page 4 Solve for depth "d" to provide required storage: d:= 1.5 ...guess value I-w + (I + 6-d) -(w + 6•d) f(d) := 2 .d ...function of d for rectangular pond w/3:1 side slopes g(d) = V d root[(f(d) - g(d)),d] d = 1.37 ft. - depth required to provide required storage for 1 inch with site fully developed Q 02da 0.0588 cfs ...Max discharge for 2 day drawdown 2day:= V 2.24.60.60 y = V Q5day 5.24.60.60 Q5day = 0.0235 cfs ...Max discharge for 5 day drawdown g := 32.2 Cd = .6 ...orifice coefficient h := d h = 0.685 ft ...avg. head 2 Aoriflce:= Q2day 5 Aorifice = 0.015 Square ft. Cd (2 g h)' Aoriflce 5 D := 4-•12 D = 1.645 in. -for 2 day drawdown 3.14 Q5day = 0.0235 cfs Q5day Aodfice:= Aorifice = 0.006 Square ft. Cd (2 g h).5 Aorifice 5 D := 4• • 12 D = 1.04 in -for 5 day drawdown 3.14 Use 1.5 inch diameter pipe in routing chart Check drawdown time: Eoinv := 24 ...elevation of orifice invert Etap 25.43 ...elevation of top of discharge strructure Do 1.5 inches - diameter of orifice Do Eocl := Eoinv + 2 Eocl = 24.063 ...elevation of center line of orifice Page 6 (Etop — Eocl) h := h = 0.684 ...avg. head 2 D do := 122 ft. - diameter of orifice l2 Aorifice 3.14. 2 I Acrifice = 0.0123 ...sq. ft. 1 q2 Cd-Aorifoe•(2•9•h) 2 q2 = 0.049 cfs q2 := g2•cfs q2 = 0.049cfs V = 10159 cubic feet of storage required V•ft3 drawdown :_ — q2 drawdown = 2.41 day Must be greater than or equal to 2 days and less than or ...O.K. equal to 6 days Determine volume of permanent pool in order to size forebay: j:=0..7 k:=1..7 Aj :_ ...area of contour 24.00 ...area of contour 23.00 ...area of contour 22,00 ...area of contour 21.00 ...area of contour 20.00 ...area of contour 19.00 ...area of contour 18.00 ...area of contour 17.50 Dj := corresponding depth from contour above Ak_1 + Ak Vk:= •Dk ... incremental volume 2 Vpond :_ Y V ...total volume equals the sum of the incremental volumes Vpond = 14726 ft3 •••total volume in permanent pool Vrequired-20,Vpond ...forebay volume equals 20% of total pool volume Vrequired = 2945ft3 ...cu.ft. required in forebay t. :.rcy tn_'!:o; . , ;�i .'rya).., .. ••., '.; :. «r � ::, ... Page 6 Determine volume in forebay: m := 0.. 7 am n:= 1..7 ...area of contour 17.50 ...area of contour 18.00 ...area of contour 19.00 ...area of contour 20.00 ...area of contour 21.00 ...area of contour 22.00 ...area of contour 23.00 ...area of contour 24.00 dm 0•ft1 5 ft1 1 •ft1 1 ft1 1-ft 1-ft1 1-ft 1 1-ft I an-1 + an vn:= 2 do ... incremental volume corresponding depth from contour below Vforebay Y, v ...total volume in forebay equals the sum of the incremental volumes Vforebay = 3018ft3 ...total volume in forebay must be >= Vrequired = 2945ft3 Check capacity of emergency spillway to pass 60 year peak flow: L:=18 ft ... Length of weir H 8 it ...Driving head Cw:=3.0 ... Weir coefficient 12 Q:= Cw-L-H1.5 Q = 29.39 must be => ... Weir capacity Q150=24.63 O.K. Using a 15" barrel, check velocity at outlet from pond: D 1.25 ft q := 8.63 cis ...max barrel discharge from routing sheets 2 Apipe = x Apipe = 1.227 Voutlet :_ q— Voutlet = 7.03 fps Apipe Determine outlet apron dimensions and riprap size for discharge from pond: From Figure 8.06.b.1 and Figure 8.06.b.2 choose Zone 2. La := 6-D La = 7.5 ft - minimum length of apron from figure 8.06b2 W := 3-1) W = 3.75 it - minimum width of apron from figure 8.06b2 dia := 6 diameter of stone in inches dmax:= 1.5•dia dmax= 9 max stone diameter t = 15 in. min. thickness of apron in inches Page 7 Determine outlet apron dimensions and riprap size for discharge to pond : V := 5.1 fps - from pipe sizing chart D:=2 ft From Figure 8.06.b.1 and Figure 8.06.b.2 choose Zone 1. La := 4-D La = 8 ft - minimum length of apron from figure 8.06b2 W := 3•D W = 6 ft - minimum width of apron from figure 8.06b2 dia := 6 diameter of stone in inches dmax:= 1.5•dia dmax = 9 max stone diameter t := 18 in. min. thickness of apron in inches Check velocity at pipe outlet under entrance drive: D:=4 ft headwater:= 35.00 — 26.00 headwater = 9 ft. headwater hwd := hwd = 2.25 D qpipe := 165 cfs - From "Hydraulic Design of Highway Culverts", a 48" pipe with headwater depth of 9' Using this flow, calculate velocity of water exiting pipe: 2 a Apipe 4 Apipe = 12.566 Voutlet :_ gpipe— Voutlet = 13.1 fps Apipe Determine outlet apron dimensions and riprap size for entrance drive: From Figure 8.06.b.1 and Figure 8.06.b.2 choose Zone 3. La := 8•D La = 32 ft - minimum length of apron from figure 8.06b2 W := 3-1) W = 12 ft - minimum width of apron from figure 8.06b2 dia := 13 diameter of stone in inches dmax 1.5•dia dmax = 20 max stone diameter t 24 in. min. thickness of apron in inches Now calculate velocities in diversion swale and check channel liner requirements: Aswale == 32174 Aswale = 0.739 acres draining to Swale 43560 Asweledist := 3275 Aswaledist = 0.075 acres disturbed area draining to Swale 43560 qt Cpre,110,Aswale q1 = 1.577 ..total flow in channel in cfs from routing chart A V '� 1• ..: is r. `. r ♦ 1 Page 8 B := 0 ...bottom width of channel (ft) M := 3 ...side slopes typical of all ditches length := 530 fall := 11 fall s:= s = 0.021 ...channel slope length n = 0.20 ...roughness coeff. for retardance factor "C" (must be consistent with depth of flow) n Zfeq:= 1 Zreq = 1.469 ...Z required (from R.Malcolm) 1.49 . f y :_ .022 ...depth of flow (ft.) - vary this number until Zav (below) is approx equal to Z.req (above) - may also have to vary n above to be consistent with this depth A := B-y + M•(y)2 A = 2.55 ...Cross -sectional area of flow (sq.ft.) at depth y P := B + 2•y 1 + M2 P = 5.831 ...Wetted perimeter (ft.) at depth y R := A R = 0.437 ...Hydraulic radius (ft.) at depth y P 2 Zav:=A-(R)3 Zav =1.469 ... Z available Now compute velocity at this depth: 2 1 V _ 1.49 R3.s2 V=0.618 fps n V•R = 0.27 Using this value, choose n from Figure 8.05c page 8.05.7 and adjust n above until consistent From Table 8.06a page 8.06A Vp := 4.5 fps - Permissible Velocity for channels lined with specified grass with slopes 0-4.5% in easily erodible non -plastic soils Since V<Vp. permanent channel lining O.K. Now check velocity in bare soil to determine if a temporary channel liner is required: n := 0.02 ...roughness coeff. for bare soil from Table 8.05b Using normal depth procedure, calculate depth of flow: Zfeq:= q1 n Zreq = 0.147 ...Z required (from R.Malcolm) 1.49 • f y :_ .369 ...depth of flow (ft.) - vary this number until Zav (below) is approx equal to Z.req (above) - may also have to vary n above to be consistent with this depth A := B•y + M-(y)2 A = 0.454 ...Cross -sectional area of flow (sq.ft.) at depth y Page 9 P:=B+2•y 1+M2 A R o 2 Zav:= A (R)3 R = 0.185 P = 2.46 Zav = 0.147 Now compute velocity at this depth: ...Wetted perimeter (ft.) at depth y ...Hydraulic radius (ft.) at depth y ...Z available 2 1 V _ 1.49 R 3 .s2 V = 3.479 fps n From Table 8.06d page 8.06.9: Vp := 2.5 fps - Permissible Velocity for unprotected soils (fine sand) in channels Since V>Vp. a temporary channel lining is required Compute velocity in swale again assuming a curled wood mat as the temporary liner: n := 0.035 ...roughness coeff. from Table 8.05e Using normal depth procedure, calculate depth of flow: qt-n Zreq Zreq = 0257 ...Z required (from R.Malcolm) 1.49 f y:= .48 ...depth of flow (ft.) - vary this number until Zav (below) is approz equal to Z.req (above) - may also have to vary n above to be consistent with this depth A := B-y+ M-(y)2 A = 0.691 ...Cross -sectional area of flow (sq.ft.) at depth y P := B + 2-y 1 + M2 P = 3.036 ...Wetted perimeter (ft.) at depth y R := A R = 0.228 ...Hydraulic radius (ft.) at depth y P 2 Zav A•(R)3 Zav =0.258 ... Z available Now compute velocity at this depth: 2 1 V := 1.49 R 3 •s2 V = 2.287 fps n Calculate shear stress for this velocity: Tallow 1.55 lb per sq.ft allowable shear stress y:- 62.4 ...unit weight of water ,.<.: ,�� . ,, �,�, .- ...r:, . . - .;.� Page 10 T:= y-y-s T = 0.622 ...shear stress Since T<Tallow. ternoc ary channel lining is O.K. Check storage behind checkdam: 32174 Aswale 43560 Aswale = 0.739 3275 Aswaledist 43560 Aswaledist = 0.075 S := Aswaledist• 1800 acres draining to swale acres disturbed area draining to swale S = 135 cuft of storage required at := 2•.5.1.3 + 1.5 at = 8 sq.ft. - area of trench at checkdam a2 := 3.25 a2 = 3.25 sq.ft. - area of trench 25' upstream at + a2 V :_ -25 V = 140.625 cuft of storage - O.K. 2 REFER TO ATTACHED SHEETS FOR ROUTING RESULTS Note: References to chart nos., table nos., and page nos. refer to Erosion and Sediment Control Planning and Design Manual unless noted otherwise I . I .�'. , 1� .., ", * * * COMMUNICATION RESULT REPORT ( FEB.17.2003 5:19PM ) * * * P. 1 I�t��IICiAI� 721 MEMORY TX OPTION REASON FOR ERROR E-1) HANG UP OR LINE FAIL E-3) NO ANSWER TTI NCDENR WIRO ADDRESS (GROUP) RESULT PAGE - --------------------------------------------------- 9-3500631 OK P. 1/1 E-2) BUSY E-4) NO FACSIMILE CONNECTION Michael F. Easley, Governor William G. Ross, Jr, Secretary North Caroli6a Department of Environment and Natural �asources Alan W. Klimek, P.E•, Director Division of Water Quality FAX Date: February 17, 2003 To: Jim Honeycutt, P.E. Company: Honeycutt Engineering FAX #: 350-001 Wilmington Regional Office SHEET No. of Pages: 1 From: Linda Lewis Water Quality Section - Stormwater FAX # 910-350-2004 Phone # 910-395-3900 DWQ Stormwater Project Number: SW8 001009 Project Name: Smith Creek Storage Facility MESSAGE: Jim: Since you have changed the storage elevation, please submit revised sealed calculations to support this change. Other than reducing the storage elevation in th pond, I'm not exactly sure why you thought a permit modification was needed. I think the ea' iest course of action would be to keep the pond as it was originally proposed, and just show the new layout on a revised plan. As long as the new 1 . •.. ,. _.. �,..._ _ .. _ _.. _1 �_ a6 _ _--_____J YIT ��A A-�-1 Ca ♦1.-.. -..J -..J ♦L- .....---..-J ..�Q--...:11 W ArFR ■I� r �w —1 Michael F. Easley, Governor William G. Ross, Jr., Secretary North Carolina Department of Environment and Natural Resources FAX COVER SHEET Date: February 17, 2003 To: Jim Honeycutt, P.E. Company: Honeycutt Engineering FAX #: 350-0631 Alan W. Klimek, P.E., Director Division of Water Quality Wilmington Regional Office No. of Pages: 1 From: Linda Lewis Water Quality Section - Stormwater FAX # 910-350-2004 Phone # 910-395-3900 DWQ Stormwater Project Number: SW8 001009 Project Name: Smith Creek Storage Facility MESSAGE: Jim: Since you have changed the storage elevation, please submit revised sealed calculations to support this change. Other than reducing the storage elevation in the pond, I'm not exactly sure why you thought a pennit modification was needed. I think the easiest course of action would be to keep the pond as it was originally proposed, and just show the new layout on a revised plan. As long as the new layout is less than or equal to the approved BUA total for the pond and the approved orifice will draw down the l" volume in 2-5 days, no modification is needed. Additionally, I don't understand why you included a second drainage area for Phase II, but are not showing any built -upon area allotted for it. Again, it is simpler to go ahead and size the pond for all the current and future built -upon area by assigning a turnip sum maximum amount for the future BUA (you don't have to break it down). That way, when the time comes to develop the future area, you need only submit a grading and dimension plan demonstrating that the proposed BUA does not exceed what was assigned in the permit. It's up to you and the applicant to decide which course of action suits the situation. I'll permit the project either way. S:\WQS\STORM WAT\ADDINFO\2003\001009.FEB03 ©VNI NCDENR N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 (910) 395-3900 Fax (910) 350-2004 Customer service 800-623-7748