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HomeMy WebLinkAboutSW8051005_COMPLIANCE_20051103STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW , DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE li 4,�lD YYYYMMDD STORMWATER SYSTEM & EROSION CONTROL NARRATIVE BURGAW ELEMENTARY SCHOOL ADDITION BURGAW, NORTH CAROLINA For Pender County Schools 925 Penderlea Highway Burgaw, NC 28425 (910) 259-2187 Revised November 2005 October 2005 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 05200 CF1VF_'D NOV 0 3 2005 BY 1W_U16 6 n, NARRATIVE DESCRIPTION The project site is a 13 93 acre tract located in Burgaw, NC Existing impervious surface to remain on the property is 91,830 SF or 2 108 acres The sods of the site consist of lightly vegetated, sandy clay topsoil and grades ranging from 0 5% to 2 0% Approximately 9 0 acres will be graded to allow the expansion of the Burgaw Elementary School 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 None of the existing impervious area to remain drains into the new retention pond EROSION CONTROL MEASURES The attached plans and specifications outline the requirements for erosion control measures Silt fencing will be provided along each side of the entrance drive where stormwater would be expected to sheet flow from disturbed areas directly to adjacent property The detention pond will be used as a silt basin during construction and restored to its design contours prior to completion 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 Pender 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 the stormwater detention pond 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 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 EROSION CONTROL NOTES AND MAINTENANCE PLAN 1 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 condition 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 / 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 No cut or fill slopes shall exceed a side slope of 1 vertical to 3 horizontal unless otherwise specified on the plan All slopes shall be seeded and stabilized within 15 days 7 The stormwater ponds will act as sediment basins and will be cleaned out when the level of sediment reaches 2 a ft below the top of the riser Gravel will be cleaned or replaced when the sediment pool no longer drains properly $ 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 9 More stringent measures shall be used to halt erosion if those shown on this plan are not effective 10 All erosion shall be controlled including side slopes before the project is completed 11 Remove temporary measures upon completion of project All permanent measures will be well established before project closeout 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 clearing and grading operations 13 The Contractor shall, within 1 disturbing activities, provide permane Temporary and permanent erosion car economical, effective, and continuous construction and post -construction period permanent seeding 2 PRODUCTS days of suspension or completion of land it protective covering for disturbed areas ;rol measures shall be coordinated to assure erosion and siltation control throughout the Use the specified seed for both temporary and 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 24 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 grain Bermuda seed shall be hulled for warm weather planting and unhulled for cool weather planting Purity of seed shall be a minimum of 98 percent and germination shall be a minimum of 85 percent 27 Silt 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 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 soil 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 ditch 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 gram 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 Jute 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 restrict movement of sediment from the site Clean sift 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 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 3 4 1 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 fertilizer shall be applied during the scarification process in 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 1/4 inch Regrade and seed eroded areas immediately 343 Mulch all areas immediately after seeding Mulch shall be applied and anchored as specified herembefore 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 DETENTION POND ANALYSIS FILE NAME G 1DATAIWPDATAIWQSIPOND1051005 WK1 PROJECT # SW8 051005 REVIEWER R Gordon PROJECT NAME Burgaw Elementary School Addition DATE 01-Nov-05 Receiving Stream Osgood Branch Class C,Sw Drainage Basin Cape Fear Index No 18-74-39-1 Site Area Drainage Area 9 00 acres I 1 8$02 00 Isquare feet Area = 4 32 acres IMPERVIOUS AREAS Rational C Buildings 4187000 square feet 095 Parking 59841 00 square feet 095 Sidewalks 298000 square feet 095 Future 815400 square feet 095 square feet square feet TOTAL 112845.00t square feet Rational Cc= 065 SURFACE AREA CALCULATION % IMPERVIOUS 60 02% SA/DA Ratio 7 00% Des Depth 3 Req SA 13165 sf TSS 90 Prov SA 17408 sf VOLUME CALCULATION * place a "1" in the box if Rational is used Rational ?* Des Storm 1,00 inches Rv= 059 Bottom 27 msl Perm Pool 3i# i�Umsl Design Pool 30 6 msl Design SA 20796 sf Req Volume cf 9247]cf Prov Volume 111 ORIFICE CALCULATION Avg Head = Flow Q2, cfs Flow Q5, cfs No of Orifices Diameter, inches Drawdown = 026 ft 0 054 cfs 0 021 cfs 1 2.00 weir HxW 2.0155 days FOREBAY Perm Pool Volume= 36985 Req Forebay Volume= 7397 Provided Volume= 867400 Percent= 23_v°la SA @ _ Elevation= Q2 Area = Q5 Area = Orifice Area Q= in COMMENTS Surface Area , Volume and Orifice are within Design Guideline: 3 15 sq in 1 26 sq in 3 14 sq in 0 053 cfs x I in roe a re- 0\ ,, S ic1l,ZA JJ ��� STORTWATER SUBMITTAL REQUIREMENTS DETENTION POND (cont) B Calculations 1 2 3 4 5 6 7 8 9 10 11 12 13 85% or 90% TSS Chart noted Pond depth SAjDA ratio calculation Required surface area at permanent pool Provided surface area at permanent pool (Based on pond dimensions) ProN ided surface area at temporary design pool Required volume calculation ProN ided volume calculation Orifice size based on required 1" volume, using average head to design pool elevation Desianer=s seal Built -upon area to each pond Forebay designed to hold 20% of the permanent pool volume (Range of 18-22 OK } Non -erosive flow for 10 yr storm to the vegetated filter, if using 85% TSS C Supporting Documentation 1 Completed permit application and supplement ✓ a. Is the person who signed the landowner or a leasee" Must be landowner b All sections and blanks completely filled in c Check signature per 1003 (e) Make sure title is provided d If agent signs, signatory authorization from ov%ner e Wet detention supplement sheet provided f Mailing address & phone of applicant- no CIO g Verify water body classification h Justifications for not meeting a design requirement i If a modification, include Designer=s Certification J Hand initial design requirements 2 Proposed deed restrictions V7, lfl0 �3S) �2CLl Zo r 10g9C� STORN4W,kTER SUBMITTAL REQUIREMENTS DETENTION POND A Site Plan ✓ 1 Development/Project Name 2 Destgnei=s seal, signature, name and firm _ 3 Legend 4 North Arrow 5 Location Map with direction, distance to named streets, NCSR numbers 6 Scale ,%- 7 Date 8 Revision number and date 9 Original contours, proposed contours, spot elevations, finished floor elevations 10 Existing drainage, including off -site Provide a map of any offsite areas 11 Property/Project boundary lines, dimensioned 14�1�A 12 Mean High Water Line, if project is adjacent surface waters 13 catch basins, pipe sizes, inverts 14 Wetlands delineated, or a note on the plans that none exist Ponds may not be located ^� in a wetland 15 Details of th. parking, ci ems , cluding side« alks, curb and gutter t/ 16 Drainage area to each pond delineated �V_." 17 Dimensions of the permanent pool la� r* 18 Vegetated filter detail if using 85% TSS This is NOT a connector ditch 19 Dimensions of the road, parking cul-de-sacs, sidewalks, and curb and gutter 20 Unit footprint with dimensions and concrete wood deck areas noted for apartments or condo development 21 Forebay at each inlet (Prefer one inlet) 22 Inlets located such that entire pond is used for treatment and no short-circuiting 23 Pond/forebay section detail with Bottom elevation Permanent pool elevation PP Storage pool elevation SP Slopes 3 1 above permanent pool Vegetated shelf located below permanent pool, 6 1 slope, «ith begin and end elevations around main pond (Not required inside forebay) Forebay bottom elevation, 3 1 slopes, Forebay weir elevation between PP and DP ✓ 24 Outlet structure detail with trash rack and onfice size specified Maximum trash rack opening size is 4" 25 Note on plans that all roof drains must be directed so as to be picked up b} the pond 26 27 A 3 1 L W ratio has been pro\ ided for the pond Maximum average pond depth of 6' (Parts of pond may be deeper -up to 7 5') —� 28 Vegetation requirements for pond slopes and wetland species for the 6 ]shelf are listed Weeping LoN e grass is not suitable for use in North Carolina CAPE FEAR RIVER BASIN Name of Stream Subbasm Stream Index Number Map Number Class Osgood Branch CPF23 18-74-39-1 I27SW8 C,Sw Otter Branch CPF17 1B-70-3-1 J26SEG C,Sw Otter Creek CPF02 16-18-5-(1) C21NE8 WS-II,HQW,NSW Otter Creek CPF02 16-18-5-(2) C21SE2 WS-II,HQW,NSW,CA Overcup Creek CPF05 16-41-4-2-(1) D22SE3 WS-IV,NSW Overcup Creek CPF05 16-41-4-2-(2) D22SE6 WS-IV,NSW,CA Owens Creek CPF02 16-14-6-2 C21NE4 WS-II,HQW,NSW Pages Creek CPF24 18-87-22 J27SE9 SA,HQW Paget Branch CPF22 18-74-29-6-2 H27SW7 C,Sw Panther Branch CPF16 18-46-5 I24NW3 C Panther Creek CPF05 16-41-1-17-3 D23SW5 WS-IV,NSW Panther Creek CPF09 17-22-5 E20SW1 C Panther Creek CPF22 18-74-18 G27SE5 C,Sw Panther Creek CPF22 18-74-19-3 G26NW9 C,Sw Parkers Creek CPF05 16-41-8-(1) D22SEB WS-IV,B,NSW Parkers Creek CPF05 16-41-8-(2) D22SEB WS-1V,B,NSW,CA Parkers Creek CPF07 18-9 E23SW8 C,HQW Parke Creek CPF02 16-11-15 C20NE6 C NSW Parkwood Branch CPF10 17-30-5-4 F20NE9 C Pasture Pond Branch CPF17 18-66-3 J26SW9 C,Sw Patchet Creek (Packet Creek) CPF13 18-20-9 F22NE4 C Patterson Branch CPF15 18-31-19-3 G22SW3 C Patterson Creek CPF11 17-38-(1) F22NW1 C Patterson Creek CPF11 17-3B-(2) F22NW1 WS-IV Pearces Mill Creek (McPieces Creek) CPF15 18-30 G23SE7 C Pedler Branch CPF15 18-31-16 H22NW2 C Peggy Island Creek CPF23 18-74-36 I27SE5 C,Sw Pemberton Creek CPF16 18-48 I24SE2 C Penwood Branch CPF09 17-12-1 E19NE3 C Persimmon Branch CPF22 18-74-22 H27NW5 C,Sw Persimmon Branch CPF22 18-74-25-1 H27NE9 C,Sw Persimmon Creek CPF11 17-40-2 F22NW2 C Persimmon Creek CPF15 18-31-24-5-3 G23SW4 C Persimmons Glade Branch CPF10 17-30-5 5 F21NW5 C Persimmons Nursery Branch CPF04 16-30-2 022NW7 WS-IV,NSW Peters Branch CPF19 18-68-2-12-2-3 H25SE2 C,Sw Peters Creek CPF18 18-68-12-11 H24SE3 C,Sw Pharisee Creek CPF22 16-74-29-3-1-2 I26NW2 C,Sw Philadephia Lake, Buffalo Lake, and White Oak CPF02 16-11-14-1-2 C19SE2 C,NSW Lake) Phillips Creek (Bakers Lake) CPF16 18-40 H23SE6 C Phils Creek CPF06 16-41-2-2-(0 3) D22NW6 WS-II,HQW,NSW Phils Creek CPF06 16-41-2-2-(0 7) D22NE7 WS-II,HQW,NSW,CA Piedmont Creek CPF02 16-11-14-2-1 C19SE5 C,NSW Pike Creek CPF23 18-74-46 J27NW3 C,Sw Pine Branch CPF04 16-28-6 D21SE2 C,NSW Pine Hill Branch CPF04 16-28-5-1 D21SW3 C,NSW Pine Lake and Shadow Lake CPF14 18-23-9 F21SE7 WS-III Piney Bottom Creek CPF15 18-31-4 G21NE9 C Piney Branch CPF17 18-77-3-1 K26NE6 C,Sw Piney Mountain Creek (Little Creek) CPF05 16-41-1-8 C22SE9 C NSW Piney Point Creek CPF17 18-88-9-2-4 L26NEB SA,HQW Pistol Branch CPF14 18-23-29-4 F23SW7 C Players Creek CPF23 1B-74-49-2-2 J27NE5 C,Sw Plum Branch CPF16 18-50-2 I24SE2 C Plummers Run CPF16 18-57 J25NW6 WS-IV Pocket Creek CPF11 17-37-0 3) F21NE9 C Page 20 of 28 TopoZone - The Web's Topographic Map Page 1 of 1 o �kEE �� ��� I 6 P�� �� �i ���I��ir � �l Q�G3�r �1G: 113�i�,i 6 I• `,� ; t �$'9 y�� a�i,� },!� � ��...ri,yp :�s � �t �� • €yr' r�J � {'� 3 kl ril'" ��B�r �a; iPv�x ��� i� Id aPS`�r • )')�{jL� �� �.�.�1v� PL�tI�, + � 1 b W I 1� "p� rzBh I � q�,tNFBi I "N, S33 rt' f ,1�'t��l I € * y Ff _ `�ii3iilk''�`nYY°•'Ss�i i! j �k� 3 Ali f� iV `+....-'� f j`k 3k' P 5ti S 3 $ f5 • �3 "��. 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