The URL can be used to link to this page

Home My WebLink AboutSW6210201_Supplement-EZ Form_20241113 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Ryan's Run 2 Project Area(ac) 34.253 3 Coastal Wetland Area(ac) _ - 4 Surface Water Area(ac) 1.524 5 Is this project High or Low Density? High _ 6 Does this project use an off-site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of-vegetated setbacks provided(feet) 30 8 Will the vegetated setback remain vegetated? Yes 9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? No 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 Infiltration System 1 12 Bioretention Cell 0 13 Wet Pond 1 14 Stormwater Wetland 0 15 Permeable Pavement 0 16 'Sand Filter 0 _17 :Rainwater Harvesting(RWH) 0 18 Green Roof _ 0 _19 Level Spreader-Filter Strip(LS-FS) 0 20 Disconnected Impervious Surface(DIS) 0 21 Treatment Swale 0 22 Dry Pond 0 23 ;StormFilter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 Name and Title: Matt Lowder,PE 28 'Organization: Bowman North Carolina,Ltd. 29 Street address: 4006 Barrett Drive,Suite 104 30 City,State,Zip: Raleigh,NC 27609 31 Phone number(s): _ 919-553-6570 32 Email: mlowder@bowman.com Certification Statement: I certify,under penalty of law that this Supplement-EZ form and all supporting information were prepared under my direction or supervision;that the information provided in the form is,to the best of my knowledge and belief,true,accurate,and complete;and that the engineering plans, specifications,operation and maintenance agreements and other supporting information are consistent with the information provided here. Designer 4 e‘CA a e,., r °:0lO •I f��61-SSS,0"Goou7 nature of Designer SEAL 24434 pp B 3 J � av,ziao- (l0.111 O V del hG• Date 1rllr tth'�l� DRAINAGE AREAS 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs 2 3 Does this project have low density areas? No 4 If so,number of low density drainage areas 0 - Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 1 2 4 Type of SCM - Wet Pond Infiltration Basin 5 Total drainage area(sq ft) 1492061 _ 979923 553710 _ 6 Onsite drainage area(sq ft) 1352690 ` 955530 397160 7 Offsite drainage area(sq ft) 180943 24393 ' _ 156550 8 Total BUA in project(sq ft) I 496534 sf 242378 sf 254156 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 220000 sf 148000 sf 72000 sf INew BUA not on subdivided lots(subject to 10 permitting)(sf) 95591 sf 69985 sf 25606 sf _ 11 Offsite BUA(sq ft) 180943 sf 24393 sf 156550 sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) -Sidewalk(sq ft) 14490 sf 12026 sf 2464 sf -Roof(sq ft) Roadway(sq ft) 81101 sf 57959 sf 23142 sf -Future(sq ft) -Other,please specify in the comment box below(sq ft) INew infiltrating permeable pavement on 13 subdivided lots(sq ft) New infiltrating permeable pavement not on 14 subdivided lots(sq ft) Existing BUA that will remain(not subject to 15 permitting)(sq ft) _16 Existing BUA that is already permitted(sq ft) 17 Existing BUA that will be removed(sq ft) _ 18 Percent BUA 33.28% 25% __ 46% 19 Design storm(inches) 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 24325 cf 21369 cf 21 Calculation method for design volume Simple Method Simple Method ;ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Offsite DA-100%Build-Out Potential INFILTRATION SYSTEM Drainage area number 1 2 Minimum required treatment volume(cu ft) 4 21369 cf j GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes 4 Is the SCM located away from contaminated soils? _ Yes 5 What are the side slopes of the SCM(H:V or enter"Vertical'for trenches)? 3:1 6 Does the SCM have retaining walls,gabion walls or other engineered side slopes? No 7 Are the inlets,outlets,and receiving stream protected from erosion (10-year storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes 11 Does the maintenance access comply with General MDC(8)? Yes 12 Does the drainage easement comply with General MDC(9)? Yes 13 1 If the SCM is on a single family lot,does(will?)the plat comply with !General MDC(10)? N/A 14 Is there an O&M Agreement that complies with General MDC(11)? Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes 16 Does the SCM follow the device specific MDC? Yes 17 Was the SCM designed by an NC licensed professional? Yes INFILTRATION SYSTEM MDC FROM 02H.1051 18 Proposed slope of the subgrade surface(%) I 0% 19 Are terraces or baffles provided? No 20 Type of pretreatment: Forebay Soils Data 21 Was the soil investigated in the footprint and at the elevation of the infiltration system? Yes 22 'SHWT elevation(fmsl) j 300.00 23 Depth to SHWT per soils report(in) 96.00 308.00 24 Ground elevation at boring in soils report(fmsl) 25 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet? Yes . 26 Soil infiltration rate(in/hr) 18.00 27 Factor of safety(FS) (2 is recommended): 2.00 Elevations _ 29 Bottom elevation(fmsl) j 307 ft 30 Storage elevation(fmsl) 309.ft 31 Bypass elevation(fmsl) I 310.9 ft 1 For Basins Only 32 Bottom surface area(ft2) 11530 ft 33 Storage elevation surface area(ft2) 14290.ft For Trenches Only 34 Length(ft) 35 Width(ft) 36 Perforated pipe diameter,if applicable(inches) 37 Number of laterals 1 38 Total length of perforated piping 39 Stone type,if applicable 40 Stone porosity(%) 41 Is stone free of fines? 42 Is the stone wrapped in geotextile fabric? _ 43 Has at least one inspection port been provided? Volumes/Drawdown 44 Design volume of SCM(cu ft) 21369 cf 45 !Time to draw down(hours) 72 hrs ADDITIONAL INFORMATION 46 Please use this space to provide any additional information about the infiltration system(s): Infiltration 1 4:27 PM 11/12/2024 WET POND 1 l Drainage area number I 3 2 Minimum required treatment volume(cu fit) 22261 cf - GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes 4 Is the SCM located away from contaminated soils? I Yes 5 What are the side slopes of the SCM(H:V)? 3:1 6!Does the SCM have retaining walls,gabion walls or other engineered No side slo.- ? i 71Are the inlets,outlets,and receiving stream protected from erosion Yes •(10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes design volume? 9 What is the method for dewatering the SCM for maintenance? Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes 11,Does the maintenance access comply with General MDC(8)? Yes 12''Does the drainage easement comply with General MDC(9)? Yes 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A General MDC(10)? 14 Is there an O&M Agreement that complies with General MDC(11)? Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes 16.Does the SCM follow the device specific MDC? Yes _17 Was the SCM designed by an NC licensed professional? Yes WET POND MDC FROM 02H.1053 - 18 Sizing method used ( SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Elevation of the excavated main pool depth(bottom of sediment 20,removal)(fmsl) 292.00 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 293.00 22 Elevation of the bottom of the vegetated shelf(fmsl) _ 296.50 23 Elevation of the permanent pool(fmsl) _ 297.00 24 Elevation of the top of the vegetated shelf(fmsl) 297.50 25 Elevation of the temporary pool(fmsl) 298.20 26 Surface area of the main permanent pool(square feet) 14570 43188 cf 27 Volume of the main permanent pool(cubic feet) 28 Average depth of the main pool(feet) 3.39 ft Equation 3 _' 29 Average depth equation used 30 If using equation 3,main pool perimeter(feet) 665.0 ft __ 31 If using equation 3,width of submerged veg.shelf(feet) 3.0 ft _ 32 Volume of the forebay(cubic feet) 7215 cf _ 33 Is this 15-20%of the volume in the main pool? Yes _ 34 Clean-out depth for forebay(inches) 48 in _ 35,Design volume of SCM(cu ft) 24325 cf — _ 36 Is the outlet an orifice or a weir? Orifice 37 If orifice,orifice diameter(inches) 2.25 in 38 If weir,weir height(inches) 39 If weir,weir length(inches _ 40 Drawdown time for the temporary pool(days) 2.62 41 iAre the inlet(s)and outlet located in a manner that avoids short- Yes circuiting? 42.Are berms or baffles provided to improve the flow path? Yes 43 Depth of forebay at entrance(inches) 48 in 44 Depth of forebay at exit(inches) 36 in 45 Does water flow out of the forebay in a non-erosive manner? Yes 46:Width of the vegetated shelf(feet) 6 ft 47 Slope of vegetated shelf(H:V) 6:1 Does the orifice drawdown from below the top surface of the 48 permanent pool? Yes 49 Does the pond minimize impacts to the receiving channel from the 1- Yes yr,24-hr storm? 50 Are fountains proposed?(If Y,please provide documentation that No MDC(9)is met.) 51 Is a trash rack or other device provided to protect the outlet system? Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes 53 Species of turf that will be used on the dam and embankment Hybrid Bermuda 54 Has a planting plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION —55IPlease use this space to provide any additional information about the wet pond(s): Wet Pond 1 4:27 PM 11/12/2024