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Home My WebLink AboutSW8051027_COMPLIANCE_20051116STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW eo57_(,c;Ql DOC TYPE ❑CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE aqzvEzzl /Cp YYYYMMDD DETENTION POND ANALYSIS FILE NAME G 1DATAIWPDATAIWQSIPOND1051027 WK1 PROJECT# SW8 051027 REVIEWER P Bartlett PROJECT NAME The Coves at Newport Receiving Stream Newport River Drainage Basin White Oak DATE 16-Nov-05 Class C Index No 21-(1) Site Area 21 67 acres Drainage Area 91 00 square feet Area = 21 03 acres IMPERVIOUS AREAS OS Bldgs OS Streets OS Sidewalks TOTAL SURFACE AREA CALCULATION % IMPERVIOUS 61 05% Des Depth 6 TSS 90 Rational C. 142282 00 square feet 095 397181 00 square feet 095 1976000 square feet 095 square feet square feet square feet 22,D square feet Rational Cc= 066 SAIDA Ratio 3 45% Req SA 31625 sf Prov SA 33821 sf VOLUME CALCULATION * place a "1" in the box if Rational is used Rational ?* Des Storm 1,00 inches Rv= 060 Bottom 27 msl Perm Pool msl Design Pool 35 msl Design SA 42347 sf Req Volume 4$ cf Prov Volume 1504 cf T !& S 0r+ ORIFICE CALCULATION Avg Head = 092 ft Flow Q2, cfs 0 265 cfs Flow Q5, cfs 0 106 cfs No of Orifices 1 Diameter, inches 4,00 weir H x W Drawdown = 13 days FOREBAY Perm Pool Volume= Req Forebay Volume= Provided Volume= Percent= SA @ = 13579 Elevation= 27 Q2 Area = Q5 Area = Orifice Area Q= in COMMENTS Surface Area , Volume and Orifice are within Design Guidelines 130714 MB+ FB 261428 2531800 19.4°�a 33831 42347 00 33 3500 8 27 sq in 3 31 sq in 12 57 sq in 0 402 cfs x in Narrative Erosion and Sedimentation Control Plan Stormwater Management Plan The Coves at Newport October 17, 2005 Owner: The Coves at Newport II, Inc. P.O. Box 1838 Morehead City NC 28557 (252) 725-3360 Engineer: Stroud Engineering, P.A. 151 -A Hwy 24 Morehead City, NC 28557 (252) 247-7479 A. Description of Project RECEIVED OCT 2 6 2009 _SWS prlo2 The Coves at Newport is a proposed duplex community with in the Town of Newport The community is expected to contain 41 duplex residential structures The project site is situated on a 217 tract west of U S Hwy 70 near the hood Lion shopping center The site has had Land Management Group personnel delineate on -site isolated wetlands which have been approved by the USCOE Off -Site drainage improvements are expected to impact 404 wetlands on a temporary basis in the amount of 0 14 acres Permanent isolated wetland impact is estimated at 0 473 acres Land Management Group has assisted in preparing the wetlands impact documents The site proposes to utilize a wet -detention pond for stormwater treatment with discharge to an unnamed tributary to the Newport River, a class C water body B. Wetlands Permits A wetlands permit has been applied for, and received from the U S Army Corps of Engineers Action ID Number 200500278, Dated October 7, 2005 C. Soil Types Soil types, according to the Carteret County soil maps, are as follow The project site KBU Kureb Sand, MN Mandarin Sand The off -site drainage area MU Murville Mucky Sand, LN Leon Sand D. Erosion and Sedimentation Control Measures The following measures are proposed for the site If it becomes evident that additional erosion and sedimentation control measures are needed, they shall be installed immediately It is intended that all grading and excavation activities within a certain area will be protected as soon as that activity is completed 1 Sediment Fence — Sediment fence will be utilized as necessary in locations as shown on plans or as deemed necessary by the engineer to insure that off -site sedtmentation is controlled 2 Seeding — All disturbed areas will be seeded within 14 days following construction in accordance with the seeding schedule shown on the plans 3 Stone Construction Entrance — Stone construction entrance will be used to reduce transport of sediment off site Maintenance PIan All erosion and sediment control measures shall be checked for stability and effective operations following every runoff producing rainfall event or at least once per week Repairs required shall be completed immediately to the dimension and functions indicated on the plans Sediment shall be removed form behind the sediment fencing when it becomes 0 5 feet deep at the fence The fence shall be replaced or repaired as necessary to maintain a barrier All seeded areas shall be fertilized, seeded and mulched within 15 days of disturbance Disturbed areas shall be fertilized, reseeded and mulched as necessary according to the Contract documents to establish and maintain a dense vegetative cover Construction Sequence 1 Clear and grub site 2 Install stone construction entrance 3 Install silt fencing as shown on plans, within areas of construction Construct stormwater pond and seed, utilize as sediment storage, install outlet structure 4 Muck and fill existing ditches as shown on plans 5 Rough grade site, seed all areas that are brought to final grade b Install utilities 7 Begin unit construction 8 Install curb and gutter, drainage outlet flumes, and place CABC 9 Pave Streets 10 Perform final seeding and mulching 1 I Remove temporary sediment traps E. Design Assumptions 1 Design storm is ten years 2 The rational method was used for the design F. Coastal Stormwater Regulations The North Carolina Division of Environmental Management implemented coastal stormwater regulations in coastal counties on January 1, 1988 These regulations are detailed in 15 NCAC 2H 1000 Stormwater Management These rules allow for a development to be considered under various options This project is submitted for approval consideration under Section 1003(d)(2) high density projects ��.� P-f H Cq O,i t' 'of Ess•9 Q Eg :o 9 s ' L i -o• ,ft��iiViai�e�,`,, D. Cullipher Date