The URL can be used to link to this page

Home My WebLink AboutSW8991003_COMPLIANCE_20041007STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. I SW DOC TYPE ❑CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE i YYYYMMDD STORMWATER SYSTEM NARRATIVE WILMINGTON INTERNATIONAL AIRPORT T-HANGAR PROJECT PHASE III WILMINGTON, NORTH CAROLINA For Wilmington International Airport 1740 Airport Boulevard Wilmington, NC 28405 (910) 341-4333 November 2004 Prepared by: NORRIS, KUSKE, & TUNSTALL CONSULTING ENGINEERS, INC. 902 Market Street Wilmington, North Carolina 28401 (910) 343-9653 (910) 343-9604 — (Fax) E-mail: office@nkteng.com NKT Project No. 04221 f NARRATIVE STORMWATER MANAGEMENT MEASURES: The project site is located in New Hanover County. Land disturbing on the site will exceed one acre, which requires the site to comply with the State Regulations. The stormwater runoff from the development will be directed to a dry stormwater detention pond. The entire site has a 14.03% coverage 'and falls within low -density criteria. However, a pocket of high density was created with the construction of the T-Hangar projects. The runoff from this area of 4.29 acres will be treated in a "dry" pond with a 100 foot long vegetated swale outlet. CONSTRUCTION SEQUENCE: The Contractor will install the gravel construction entrance prior to beginning any clearing and grading operations. Silt fence will be installed when and if conditions warrant during construction. The detention pond/silt basin will be constructed immediately after that portion of the site is cleared, and outlet structure with protection will be installed. Disturbed areas will be landscaped or seeded upon completion. The pond will be cleared out to its required contours at completion of construction. NKT #04221 DRY POND MAINTENANCE Project Name: Wilmington International Airport T-Hangar -- Phase III Responsible Party Name: Jon_ W. Rosbo_rough, Director Address: 1740 Airport Boulevard Wilmington, NC 28405 Phone No.: 910-341-4333 Maintenance requirements are as follows: 1. All grassed areas of an extended dry detention basin should be mowed at least twice annually. 2. Extended dry detention basins will tend to collect debris, and it should be removed whenever it accumulates, or at least twice annually. 3. The basin should be inspected after rain events to ensure that it is operating as designed. 4. At a minimum, items that should be included in inspections and addressed are: A. Clogging of the outlet or too rapid a release, B. Erosion on the banks, C. Erosion at the inlet and outlet, D. Sediment accumulation and the need for removal, E. Condition of the emergency spillway, and F. Woody vegetation in the embankment. SPECIAL REQUIREMENTS: 1, Jon W. Rosborough, Director, agree to be responsible for performing the maintenance items as listed above for this project. I agree to notify NC DWQ of any problems with the system, or changes of the name of the project, name of the responsibility party or address. 1 Signature:Date: i D w �z Dale Design; NORRIS, KUSKE &TUNSTALL 902 Market St. Sleet CONSULTING ENGINEERS, INC. Wilt-nington, N.C. 28401-4733 Ot Check Job�rr 71, ,ift��'R � L For ;r' Job No. 61TV 1. esli? 7Z CI /d •C_ ��j+iuse�N�► + �1" G, TO .sP4 Pia Y TV-4 -:3171:5 ()''tr-'! ,t-:" ?=V4. -i'.._ " "7 T'!f`� Geri' %l:a!s}r'�1s11A/ Pr 0 4� Z- fry t� -2 rT �-2)' z J p, 005 fTZ- CAPE FEAR RIVER BASIN Name of Stream Subbasin Stream Index Number Map Number Class Scotchman Creek CPF10 17-28.3 F20NE6 C;HQW Scott Branch CPF17 18-64-4 J26SW7 C;Sw Scrub Creek CPF02 16-18-4.5-(1) C21NEB WS-II;HQW,NSW Scrub Creek CPF02 16-18-4.5-(2) C21NEB WS-II;HQW,NSW,CA Second Silver Run CPF13 18-20-33-1 F23SE3 WS-IV Service Creek (Servis Creek) CPF02 16-15 C21SW2 C;NSW Sevenmile Swamp CPF19 18-68-1-3 G25NWS C;Sw Shaddox Creek CPFG7 16-43 E22NE9 WS-IV Shade Branch CPF19 18-66-2-11-1 H26SW4 C;Sw Shaken Creek CPF23 18-74-33-4 I28SWS C;Sw Shelbed Creek CPF17 16-88-4 L27NW7 SA;HQW Shelter Swamp Creek CPF23 18-74-33-2-2 128822 C;Sw Shinn Creek CPF24 18-87-25 K27NE5 SA;HQW Sikes Mill Run CPF19 16-68-2-10-4 H26NW9 C;Sw Sills Creek CPF22 16-74-29-4 I26NE5 C;SW Silver Lake CPF17 18-82-1 K27NW9 C;Sw Silver Run CPF14 18-23-13-2 G21NE8 WS-III Silver Stream Branch CPF17 18-76-1-1 K27NW5 C;Sw Simlin Creek CPF10 17-26-7 F20NE7 C Simmons Branch CPF08 17-10-(1) D19SE2 WS-IV:• Simmons Branch CPFOB 17-10-(2) D195E2 WS-IV;CA:* Simon Branch CPF17 18-64-8 725SE6 C;Sw Singletary Lake CPF20 18-68-17-5-1 I25SW1 B;Sw Sings Creek CPF10 17-26-5-5-1 F20SW2 WS-III Six Runs Creek CPF19 18-68-2-(0.3) G25NE9 C;Sw Six Runs Creek CPF19 1B-68-2-(11,5) H26SW1 C;Sw,ORW;+ Skipper Hill Branch CPF17 1B-66-6-2 J26SW6 C;Sw Skunk Creek CPF11 17-40-1 F22NW2 C Slash Branch CPF14 1B-23-16-6-1 F22SW7 WS-III Smith Branch CPF02 16-11-11 C20NW5 C;NSW Smith Branch CPF13 16-20-31 F23SE5 WS-IV Smith Creek CPF23 18-74-63 J27SE7 C;Sw Smith Swamp (Jones Lake Drain) CPF16 18-46-7 I24NE4 C SmiChs Creek CPF10 17-34 E21SEB WS-IV Smiths Mill Pond Run (Smiths Mill Pond) CPF18 18-68-12-14 I25NW2 C;Sw Smokehouse Creek CPF17 16-88-11 L26NE9 SC;HQW Snows Cut CPF17 18-87-31.5 K27SW6 SC Snows Cut CPF24 18-87-31.5 K27SW6 SC Snows Marsh CPF17 1B-88-2 L27NW1 SC South Buffalo Creek CPF02 16-11-14-2 C19Sw6 C;NSW South Fork Cane Creek CPF04 16-26-5 D21SW6 C;NSW South Prong Anderson Creek CPF14 18-23-32-2 F23SW8 C South Prong McLeod Creek CPF14 18-23-29-1-2 F22SE6 C South Prong Richland Creek CPF09 17-22-2 E19SE3 C South Prong Stinking Quarter Creek CPF03 16-19-8-2-(2) D20NRS C;NSW South Prong Stinking Quarter Creek CPF03 16-19-B-2-(1) D20NE5 B;NSW (Kimesville Lake) South River CPF18 18-65-12-(0.5) G24NWC C;Sw South River CPF18 18-68-12-(B.5) H24NE9 C;Sw,QRW:+ Southport Restricted Area CPF17 18-88-3.5 L27NW4 SC Spearmans Mill Creek CPF19 18-68-2-15 H25SE6 C;Sw Spring Branch CPF16 18-46-3 H24SE7 C Spring Branch CPF18 16-68-12-2-4-1-2 G24NE2 C;Sw Spring Branch CPF23 18-74-63-1 J27SE7 C;Sw Page 25 of 30 A&K#99254 Permit No. (to be Provided by DIV& State of North Carolina Department of Environment and Natural Resources Division of Water Quality STORMWATER MANAGEMENT PERMIT APPLICATION FORM LOW DENSITY SUPPLEMENT This form maybe photocopied for use as an original A low density project is one that meets the appropriate criteria for built upon area and transports stormwater runoff primarily through vegetated conveyances. Low density projects should not have a discrete stormwater collection system as defined by 15A NCAC 2H .1002(18). Low density requirements and density factors can be found in 15A NCAC 2H .1005 through .1007. I. PROJECT INFORNIATION Project Name : Wilmington .lnterii tinnal ir4�ort T.-Hangar .Project _ Contact Person: Willard G. Plenty., Jr. Phone Number: 0.10 343-4333 Number of Lots. N/A Allowable Built Upon Area Per Lot*: N/A *If lot sizes are not uniform, attach a table indicating the number of lots, lot sizes and allowable built upon area for each lot. The attachment must include the project name, phase, page numbers and provide area subtotals and totals. II. BUILT UPON AREA See the Stormwater Management Permit Application for specific language that must be recorded in the deed restrictions for all subdivisions. For uniform lot sizes, complete the following calculation in the space provided below where: • SA Site Area - the total project area above Mean High Water. Wetlands may be excluded when the development results in high density pockets. • DF Density Factor - the appropriate percent built upon area divided by 100. • RA Road Area - the total impervious surface occupied by roadways. • OA Other Area - the total area of impervious surfaces such as clubhouses, tennis courts, sidewalks, etc. • No. Lots - the total number of lots in the subdivision. • BUAILot - the computed allowable built upon area for each lot including driveways and impervious surfaces located between the front lot line and the edge of pavement. Form SWU-104 Rev 3.99 Page 1 of 2 Calculation: (SA x DO - RA - OA = BUA No. Lots Lot See attached calculations. III. REQUIRED ITEMS CHECKLIST Initial in the space provided to indicate that the following requirements have been met and supporting documentation is provided as necessary. If the applicant has designated an agent on the Stormwater Management Permit Application Form, the agent may initial below. Applicants Initials (X-k a. A 30 foot vegetative buffer is provided adjacent to surface waters. Projects in the Neuse River basin may require additional buffers. N/A b. Deed restriction language as requited on form SWU-101 shall be recorded as a restrictive covenant. A copy of the recorded document shall be provided to DWQ within 30 days of a platting and prior to sale of any lots. c. Built upon area calculations are provided for the overall project and all lots. NIA d.. Project conforms to low density requirements within the ORW AEC (if applicable). [15A NCAC 2H .1007(2)(b)] Form SWU-104 Rev 3.99 Pane 2 of 2 Date Design Andrew and Kuske 0 1 d Y� 902 Markel St. CONSULT[NG ENGINEERS, INC. Wilmington, N.0 26401 Check Job S-��/yj w/�_ for �� E(F?l C/� r --T-OTT L. rat f;�Ti AA4 � 00 5 7��p,jw jj ii� RiLL 'fcfflflW6 Date Design Andrew and Kuske Sheet 902 Market St. CONSULTING ENGINEERS, INC, Wilmington. N.C. 28401 r Of 1 Check Job LM.�I /�'j�p� For � �,8-N� �_ S P Job No. c id-c rLS 1 (�O I q Le 7D rre- 51 ttc &,,Ct'�PnU� P2Vna�� `7o / m (' - '�5, 27 4-r- ; 14- 5,-, Ar- - / �, -5 77;4� So O� `"111119? too I •••`-�tk A • 4 /r spi SEAL y 1966 00 �, ? .._ LL�P Frz7 (12v