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Home My WebLink AboutSW8060831_COMPLIANCE_20061005STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW263 DOC TYPE El CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE �ZV COMPLIANCE EVALUATION INSPECTION l DOC DATE �201110 LiK)S- YYYYMMDD 1- INFILTRATION BASIN & PUMP SYSTEM ANALYSIS FILENAME S IWQSIINBASIN1060831 WK1 1 Pump Station, 6" FM to Basin Page 1 of 2 PROJECT NUMBER SW8 060831 DATE 05-Oct-06 PROJECT NAME Overlook at Caison's Creek DRAINAGE BASIN Lumber REVIEWER P Bartlett RECEIVING STREAM UT ICWW CLASS SA, HQW Index No 15-25 If ORW, is site within the 575' AEC? SITE AREA 7 42 acres DRAINAGE AREA 1 323,215 SF DRAINAGE AREA 2 SF IMPERVIOUS AREA CALCULATION BASIN 1 BUILDINGS PARKING/ASPHALT CONCRETE OTHER (amenity) % IMPERVIOUS, 1= Rational C 83,940 095 55,452 095 19,602 095 10,660 095 TOTAL 169654 C 059 Place a "1" here if Rational RV= 05+ 009 (1 ) = 0 5� BASIN 2 Rational C BUILDINGS PARKING/ASPHALT CONCRETE OTHER TOTAL ®C f#DIV103 Place a "1" here if Rational % IMPERVIOUS, 1= # I /1Q1 RV= 05+ 009 (I) = O O! ELEVATION OF SEASONAL HIGH WATER TABLE REPORTED INFILTRATION RATE SURFACE AREAS AND ELEVATIONS INFILTRATION BASIN Elev (ft) Area, sq ft BOTTOM 308 26891 30 8 26891 308 26891 TOP 317 30690 PUMP BASIN 1-A (Storaae above PP BOTTOM 24 50 24 50 PP 24 50 24 50 24 50 TOP 25 50 PUMP BASIN 1-B (Storage above PP) BOTTOM 0 2$ FEET MSL 5 INCHES/HOUR or 0 000116 FPS Inc Volume Acc Volume 0 0 25911 (Pump Station Only) 0 0 0 0 0 50 TOP STORAGE VOLUME ABOVE PP, BASIN 1-A & 1-13 lot 0 0 25911 0 0 0 0 0 50 0 0 0 0 0 0 50 Basin 1/Pump 1 INF BASIN in 2/Pump INFILTRATION BASIN & PUMP SYSTEM ANALYSIS FILENAME S 1WQSIINBASIN1060831 WK1 PROJECT NUMBER SW8 060831 Page 2 of 2 PROJECT NAME Overlook at Carson's Creek DATE 05-Oct-06 PUMP BASIN 2 (Storage above PP) BOTTOM 0 0 0 0 PP 0 0 0 0 0 0 TOP 0 0 STORAGE VOLUME ABOVE PP, BASIN 2 0 VOLUME 1 DEPTH 1 DRAWDOWN CALCULATION BASIN 1 BASIN 2 DESIGN STORM, INCHES DESIGN VOLUME TOT VOL AVAILABLE, Infiltration Basin DEPTH OF RUNOFF TIME TO DRAWDOWN INF BASIN INF BASIN DRAWDOWN RATE TOT AVAIL VOLUME ABOVE PP SELECTED PUMP RATE Must Be< 1397 0 gpm GPM Storage Basin Drawdown Days Hours 420 0 26 j jj PUMP 2 #DIV/Ot #DIV/01 TOT PUMP RATE 420 CUBIC FEET CUBIC FEET FEET HOURS MUST BE <120 GPM CUBIC FEET Pipe Size, in Frict Factor,f 2 0 019 3 0 018 4 0 017 6to10 0015 12 0 013 Drawdown Time at Total Pump Rate 030 Hours Volume Pumped & Infiltrated in First 2 Hours 67385 CIF Tot Vol Infiltrated Plus Stored in 2 Mrs Must bey 21106 67885 CIF (Required storage at infiltration basin & design vol infiltrated in 6 27 hrs) PUMP SIZING PUMP SYSTEM 1 PUMP SYSTEM 2 6 ENTER PIPE SIZE, D, INCHES d 016 ENTER FRICTION FACTOR,f ENTER SYSTEM QUANTITIES (from above table) Basin 1 ' j Basin 2 C3tL Item K Eq Langth,ft 45 deg std el 024 00 5 90 deg std el 045 750 Std Tee- Run 03 00 Std Tee 09 00 1 Gate Valve-ope 012 40 1 Swing Check -open 075 250 Foot Valve 13 00 Reducer to dia R 1 0486 2 0 0 500 500 00 0 EQUIVALENT LENGTH, ft 120 2 ENTER STRAIGHT RUN OF PIPE, ft TOTAL LENGTH OF PIPE, ft HEAD LOSS, hf, FOR PIPE SIZE ENTER REQUIRED LIFT, ft PUMP OPERATING POINT REQ'D TOT DYNAMIC HEAD, TDH, ft PUMP RATE, gpm 345,E 465,2 49 66 11�7 420 Qty Item K Ea Len 45 deg std el 0 00 90 deg std el 0 00 Std Tee- Run 0 00 Std Tee 0 00 Gate Valve -open 0 00 Swing Check -open 0 00 Foot Valve 1 3 00 Reducer todia R 0 1 4 #DIV101 #DIVI01 0 L 4 #DIV101 #DIV101 EQUIVALENT LENGTH, ft #DIV101 #DIV101 (Inf Basin bottom elev - Pump Off elev) #DIVIO t 0 { 07/05/2006 WED 16:48 FAX 910 343 9604 Norris, Kuske, Tunstall 001/009 �Qa &A�j �M;s — �► P VS North I6tplrtmeMSERAnt and Natural Resources ry y n 127 Cardinal Dnve, Wilmington NC 28405 (910) 796.7215 FAX (910) 350-2004 NKT #06072 Y1IL� Request for Express Permit Review r� � d FILL-IN all information below and CHECK required Permits) FAX or *marl to Cameron. WeayereacmarLnet along with a narrative and vicinity map of the project location. Projects must be submhied by 9:00 A.M. of the review date, unless prior arrangements are made. APPLICANT Name Charles R. Price, Manager Company Overlook at Caiso 's C ek LLC Address 3105A Holden Beach Road City/State S, upply. NC _ Zip 2846County Brunswick Phone 910-842 7898 Fax 566-721-8265 Email NIA PROJECT Name Overlook at Canon's Creek PROJECT SYSTEM(S) TRIBUTARY TO UTATLANTIC INTRACOASTAL WATERWAY (STREAM NAME) Lumber RIVER BASIN ENGINEERICONSULTANT J Phillip Norris, P E Company Noms Kuske & Tunstall Consulting Engineers, Inc Address 902 Market Street_ _ _ _._ _ _ City/State Wilmington. NC __Zip 284 11 County New Hanover Phone 910-343-9653 Fax 91a-343-9604 _ Email anorris(&nkteng com State or National Environmental Policy Act (WA, NEPA) — EA or EIS Required ❑ Yes ❑ No ❑ STREAM ORIGIN Determination; # of stream calls, Stream Name ® STORMWATER ❑ Low Density ❑ High Density -Detention Pond ❑ High Density -Other Wetlands MUST be addressed below ❑ Low Density -Curb A Gutter ® High Density -Infiltration ❑ Off site COASTAL ❑ Excavation &, F11 ❑ Bridges &, Culverts ❑ Structures Information M MANAGEMENT ❑ Upland Development ❑ Marina Development ❑ Urban Waterfront ® LAND QUALITY ® Erosion and Sedimentation Control Plan with ZQ acres to be disturbed WETLANDS (401) Wetlands on Property ❑ Yes ® No Isolated Wetlands on Property ❑ yes ® No Qg9Ap/1 that apply Wetlands Will Be Impaded ❑ Yes ® No Weiland Impeds 0 Acre(s) Wetlands Delineation has been completed ❑ Yes ❑ No ❑ Buffers Impacted ____-Acre(s) USACOE Approval of Dehneafron completed ❑ Yes ❑ No 404 Application in process w1USAC0E ❑Yes [:]No I Permit received from USACE ❑Yes ❑No 401 Application required ❑Yes ❑ No If Yes, ❑ Regular [] Express Additional fees, not to exceed 50% of tide original Express Review permit application fee, may be charged for subsequent reviews due to the insufficiency of the permit applications. For DENR use only SUBMITTAL DATES: Fee Split for multiple permits SW $ CAMA $ LOS $ 401 $ Total Fee Amount $ 07/05/2006 WED 16:50 FAX 910 343 9604 Norris, Kuske, Tunstall p9/009 v D IV_ JJ 137 _ 1139 Nc SITE w BEACH NC ATLANTIC OCEAN VICINITY MAP NO SCALE 07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall 2003/009 NARRATIVE DESCRIPTION The project site is a 7 acre tract located in Holden Beach in Brunswick County The soils of the site consist of lightly vegetated, sandy topsoil and grades ranging from 0 5% to 2 0% Approximately 7 0 acres will be graded to allow construction of a new residential community with paved parking and paved access The runoff from the site is estimated using the rational method 10-year design storm and rainfall data for the area Construction is scheduled to begin as soon as all permits and approvals are obtained EROSION CONTROL MEASURES The attached plans and specifications outline the requirements for erosion control measures Silt fencing will be provided where stormwater would be expected to sheet flow from disturbed areas directly to adjacent property Gravel check dams will not be provided unless the Contractor has to temporarily discharge into an open ditch instead of the proposed storm drain outfall A gravel construction entrance will be constructed at the entrance. Maintenance will be provided by the grading contractor and developer STORMWATER MANAGEMENT MEASURES The project site is located in Brunswick 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 an onsde infiltration basin The stormwater system is designed to accommodate this site with 1 5 inches of initial runoff storage and by-pass of the excess CONSTRUCTION SEQUENCE The Contractor will install the gravel construction entrance and silt fence prior to beginning any clearing and grading operations Additional silt fence will be installed when and if conditions warrant during construction The silt basins wlll 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 07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall Z004/009 EROSION CONTROL NOTES AND MAINTENANCE PLAN Install erosion control measures before beginning construction or as soon thereafter as possible All erosion and sediment control practices will be checked for stability and operation following every runoff -producing rainfall but in no case less than once every week Any needed repairs will be made Immediately to maintain all practices as designed 2 Maintain the gravel construction entrances in a condmon to prevent mud or sediment from leaving the construction site The contractor shall inspect the construction entrances on a daily basis This will require periodic top dressing with additional No. 4 stone Any objectionable materials spilled, washed, or tracked onto public roadways shall be removed immediately 3 Install erosion control measures around the drop inlets as shown on the plans to trap silt during construction Inspect the erosion control around the inlets after each rain and make repairs immediately Remove sediment when It becomes 0 50 deep to provide adequate storage volume for subsequent rains When the contributing drainage area has been adequately stabilized, remove all materials and any unstable soil and either salvage or dispose of it properly Bring the disturbed area to proper grade and appropriately stabilize all bare areas around the drop inlets 4 Sediment will be removed from behind the silt fence when it becomes 0 5 feet deep at the fence The sediment fence'will be repaired as necessary to maintain a barrier Silt fence stakes shall be spaced 6 feet apart unless a wire backing is used with 8 foot stake spacing 5 Inspect temporary sediment traps 1 check dams after each period of significant rainfall Remove sediment and restore the trap to its original dimensions when the sediment has accumulated to one-half the design depth of the trap Place the sediment that is removed in the designated disposal area and replace the contaminated part of the gravel facing. Check the structure for damage from erosion or piping. Periodically check the depth of the spillway to ensure it is a minimum of 1 5 ft below the low point of the embankment Immediately fill any settlement of the embankment to slightly above design grade. Any riprap displaced from the spillway must be replaced immediately After all sediment - producing areas have been permanently stabilized, remove the structure and all unstable sediment Smooth the area to blend with the adjoining areas and stabilize properly 6 The angle for graded slopes and fills shall be no greater than the angle that can be retained by vegetative cover or other adequate erosion -control devices or structures In any event, slopes left exposed will, within 21 calendar days of completion of any phase of grading, be planted or otherwise provided with 07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall �005/009 temporary or permanent ground cover, devices, or structures sufficient to restrain erosion. 7 All disturbed areas shall be seeded within 15 days of disturbance All seeded areas will be fertilized, reseeded as necessary and mulched according to specifications in the vegetative plan to maintain a vigorous, dense vegetative cover 8 More stringent measures shall be used to halt erosion if those shown on this plan are not effective 9 All erosion shall be controlled including side slopes before the project is completed 10 Remove temporary measures upon completion of project All permanent measures will be well established before project closeout 07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Huske, Tunstall 2 006/009 SECTION 02920 SOIL EROSION AND SEDIMENTATION CONTROL GENERAL 1 1 Contractor shall take every reasonable precaution throughout construction to prevent the erosion of sod and the sedimentation of streams, lakes, reservoirs, other water impoundments, ground surfaces, or other property as required by State and Local regulations 12 The Contractor shall install all required silt fences, and construction entrances at the initiation of work, and have these measures reviewed and approved by the local permit authority prior to Gearing and grading operations 13 The Contractor shall, within 15 days of suspension or completion of land disturbing actmties, provide permanent protective covering for disturbed areas Temporary and permanent erosion control measures shall be coordinated to assure economical, effective, and continuous erosion and siltation control throughout the construction and post -construction period Use the specfied seed for both temporary and permanent seeding 2 PRODUCTS 21 Asphalt for anchoring mulch shall be Type SS-1 Emulsion 22 Fertilizer shall be 10-10-10 grade or equivalent 23 Lime shall be dolomitic agricultural ground limestone containing not less than 10 percent magnesium oxide 2.4 Mulch shall be small grain straw, hay, wood chips, asphalt emulsion, jute or other suitable material free of undesirable weed seed 25 Phosphate shall be 20 percent superphosphate or equivalent. 26 Seed shall be 20% carpet grass, 24% Bermuda, 20% turf Fescue, 10% Creeping Red Fescue, and 24% Annual Rye gram Bermuda seed shall be hulled for warm weather planting and unhulled for cool weather planting Punty of seed shall be a minimum of 98 percent and germination shall be a minimum of 85 percent 27 Sit fence shall consist of NCDOT Class A fabric supported by wood or metal posts spaced not more than 6 feet on center The bottom of the fabric shall be buried a minimum of 6 inches 28 Gravel for check dams shall be #57 washed stone 07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall Z007/009 29 Aggregate for construction entrance shall be #4 washed stone 210 Stone rip rap for check dams and erosion control shall be NCDOT Class A or B as shown 3 EXECUTION 31 General Take every practicable measure during construction or suspension to work to minimize erosion and siltation Measures should include good construction practices, temporary physical barriers to sediment travel, settling basins for new ditches, and establishment of vegetative cover 32 Construction Practices 3 2 1 Avoid dumping sod or sediment into any wetland or watercourse 322 Maintain an undisturbed vegetative buffer where possible between a natural watercourse and trenching and grading operations 323 Avoid equipment crossings of streams, creeks, and ditches where practicable 324 Grade all cut, fill and drtch slopes to minimum slope of 31, unless otherwise shown or directed 33 Temporary Physical Barriers are required where sedimentation on off site property or excessive erosion is a problem 3 3 1 Mulch shall be used for temporary stabilization of areas subject to excessive erosion and for protection of seedbeds after planting where required 1 Apply grain straw and hay at a rate of 75 to 100 pounds per 1000 square feet and wood chips at a rate of 500 pounds per 1000 square feet .lute and mesh should be Installed as per manufacturer's instructions 2 Asphalt emulsion for slope stabilization should be applied at a rate of 1,000 gallons per acre Asphalt emulsion used for anchoring straw should be applied at a rate of 150 gallons per ton of straw 3 3.2 Silt Fences shall be used at the base of slopes to restnct movement of sediment from the site Clean silt fence of accumulated sediment after each rainfall event or when it exceeds a depth of 0 5 feet above natural grade 333 Stone Check Dams, placed at the discharges of creeks, ditches, and swales, shall consist of Class A or Class B erosion control stone at minimum two feet high and 07/05/2006 WED 16:49 FAX 99 343 9604 Norris, Kuske, Tunstall 2 008/009 three feet thick across the watercourse, with a one foot thick layer of gravel on upstream side Remove sediment if accumulated to a depth of 10 feet at upstream face 34 Vegetative Cover Establish and maintain permanent vegetative cover on all unpaved areas disturbed by the work 341 Preparation of Seedbed Areas to be seeded shall be scarified to a depth of 4 inches and until a firm, well pulverized, uniform seedbed is prepared Lime, phosphorous and ferblizer shall be applied during the scarrfication process to accordance with the following rates Lime 45 pounds per 1000 square feet Phosphorous 20 pounds per 1000 square feet Fertilizer 17 pounds per 1000 square feet 342 Seeding Disturbed areas shall be seeded with 2 to 3 pounds per 1000 square feet of the specified seed mixture Seed shall be worked into the bed to a depth of 114 inch Regrade and seed eroded areas immediately 343 Mulch all areas immediately after seeding Mulch shall be applied and anchored as specified hereinbefore. Reapply as necessary to retain cover until grass is established 35 Construction Entrance Provide an aggregate drive, 20 feet wide by 50 feet long by 6 inches thick at each entrance to the site used by construction vehicles, until such time as the permanent roadway is constructed Remove soil if accumulated to a depth greater than 0 5 inches 36 Maintenance The Owner and Contractor shall be responsible for maintaining all temporary and permanent erosion control measures Temporary structures shall be maintained until such time as vegetation is firmly established in the area protected by the structure Permanent streambank protection and grassed areas shall be maintained until completion of the project Areas that fail to show a suitable stand of grass or which are damaged by erosion shall be immediately repaired END OF SECTION 07/05/2006 WED 16:49 FAX 910 343 9604 Norris, Kuske, Tunstall �002/009 STORMWATER SYSTEM & EROSION CONTROL NARRATIVE OVERLOOK AT CAISON'S CREEK HOLDEN BEACH, NORTH CAROLINA For Overlook at Caison's Creels, LLC 3105A Holden Beach Road Supply, NC 28462 (910) 842-7898 July 2006 Prepared by NORRIS, KUSKE & TUNSTALL CONSULTING ENGINEERS, INC. 902 Market Street Wilmington, North Carolina 28401 (910) 343-9653 (910) 343-9604 (Fax) NKT Project No 06072