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Home My WebLink AboutSW6231103_Supplement-EZ Form_20240628 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION _ _ 1 _ 1 Project Name _ _ Godwin Subdivision 2 I Project Area(ac) _ 31.53 3 I Coastal Wetland Area(ac) _ 0 4 Surface Water Area(ac) 0 6 Is this project High or Low Density? High 6 ;Does this project use an off-site SCM? No 1 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)? N/A 10 i Is streambank stabilization proposed on this project" No NUMBER AND TYPE OF SCMs: _ 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 1 14 I Stormwater Wetland 15 i Permeable Pavement _ 16 Sand Filter 17 Rainwater Harvesting(RWH) 18 Green Roof 19 Level Spreader-Filter Strip(LS-FS) 20 Disconnected Impervious Surface(DIS) 21 Treatment Swale 22 Dry Pond 23 StormFilter 24 Silva Cell 25 Bayfilter 26 Filterra FORMS LOADED DESIGNER CERTIFICATION 27 j Name and Title: Donald L.Curry.Jr.,PE/Project Manager 28 Organization: Curry Engineering 29 !Street address: 205 S.Fuquay Ave. 30 'City,State,Zip: Fuquay-Varina.NC 27526 31 Phone number(s): 919-552-0849 32 Email: don@curryeng.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 c=b0d4 Signature of Designer • 03, Lit . _ e• /24202 -.4411-.atiaitCOL'10/7-q 2-01-1-1 Seat Date DRAINAGE AREAS 1_ Is this a high density project? Yes 2 _ If so,number of drainage areas/SCMs 1 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 4 ,Type of SCM Wet Pond Wet Pond 5 Total drainage area(sq ft) 1142815 1094463 6 Onsite drainage area(sq ft) 1142815 1094463 7 Offsite drainage area(sq ft) 0 0 8 Total BUA in project(sq ft) 496913 sf 496913 sf_ New BUA on subdivided lots(subject to permitting) 9 (sq ft) ; 348000 sf 348000 sf New BUA not on subdivided lots(subject to 10 ;permitting)(sf) 148913 sf 148913 sf 11 Offsite BUA(sq ft) sf sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 2745 sf 2745 sf -Sidewalk(sq ft) 500 sf 500 sf I -Roof(sq ft) sf sf -Roadway(sq ft) 145186 sf 145186 sf -Future(sq ft) sf sf -Other,please specify in the comment box below(sq ft) 500 sf 500 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) sf sf New infiltrating permeable pavement not on 14 'subdivided lots(sq ft) sf sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) sf sf 16 Existing BUA that is already permitted(sq ft) sf sf 17 Existing BUA that will be removed(sq ft) sf sf 18 Percent BUA 45% 45% 19 Design storm(inches) 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 41829 cf 41829 cf 21 1 Calculation method for design volume Simple Simple ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Mail kiosk accounts for values under line#12:parking and sidewalk.The pump station yard is gravel and therefore not impervious,however,500 sf was allocated for concrete structures in the yard itself. DRAINAGE AREAS I 1 I Is this a high density project? _ Yes 2 I If so,number of drainage areas/SCMs _ 1 3 _1 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 L5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 4 Type of SCM Wet Pond 5 Total drainage area(sq ft) 1142815 6 Onsite drainage area(sq ft) 1142815 7 Offsite drainage area(sq ft) 0 8 Total BUA in project(sq ft) 496913 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 348000 sf New BUA not on subdivided lots(subject to 10 !permitting)(sf) 148913 sf 11 Offsite BUA(sq ft) sf 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 2745 sf -Sidewalk(sq ft) 500 sf -Roof(sq ft) sf -Roadway(sq ft) 145186 sf -Future(sq ft) sf -Other,please specify in the comment box below(sq ft) 500 sf New infiltrating permeable pavement on 13 subdivided lots(sq ft) sf New infiltrating permeable pavement not on 14 subdivided lots(sq) sf Existing BUA that will remain(not subject to 15 permitting)(sq ft) sf 16 Existing BUA that is already permitted(sq ft) sf 17 Existing BUA that will be removed(sq ft) sf 18 Percent BUA 45% 19 Design storm(inches) 1.0 in 20 Design volume of SCM(cu ft) 41829 cf 21 Calculation method for design volume Simple ADDITIONAL INFORMATION _ Please use this space to provide any additional information about the 22 drainage area(s): _ Mail kiosk accounts for values under line#12:parking and sidewalk.The pump station yard is gravel and therefore not impervious,however,500 sf was allocated for concrete structures in the yard itself. WET POND 1.Drainage area number _ 1 21 Minimum required treatment volume(Cu ft) 41628 cf I 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)? 3:1 6 Does the SCM have retaining walls,gabion walls or other engineered 1 Yes __side slopes? 7 Are the inlets,outlets,and receiving stream protected from erosion Yes 1(10-year storm)? 8 Is there an overflow or bypass for inflow volume in excess of the Yes design volume? 91What is the method for dewatering the SCM for maintenance? i Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes 111 Does the maintenance access comply with General MDC(8)? Yes 121 Does the drainage easement comply with General MDC(9)? i Yes If the SCM is on a single family lot,does(will?)the plat comply with 13 General MDC(10)? No 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.E053 18'Sizing method used SA/DA 19 Has a stage/storage table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth(bottom of sediment 132.50 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 133.50 22 Elevation of the bottom of the vegetated shelf(fmsl) 137.50 23 Elevation of the permanent pool(fmsl) 138.00 241 Elevation of the top of the vegetated shelf(fmsl) 138.50 25'Elevation of the temporary pool(fmsl) I 139.30 26 Surface area of the main permanent pool(square feet) 25639 27 Volume of the main permanent pool(cubic feet) 113076 cf 28 Average depth of the main pool(feet) 4.94 ft 29tAverage depth equation used Equation 3 301 If using equation 3,main pool perimeter(feet) 699.0 ft 31 If using equation 3,width of submerged veg.shelf(feet) 3.0 ft 32 Volume of the forebay(cubic feet) 6286 cf 33 Is this 15-20%of the volume in the main pool? Yes 34 Clean-out depth for forebay(inches) i 12 in 351 Design volume of SCM(cu ft) 46094 cf 36 Is the outlet an orifice or a weir? Orifice 37' If orifice,orifice diameter(inches) 3 in 38 If weir,weir height(inches) I in 39 If weir,weir length(inches) in 40 Drawdown time for the temporary pool(days) 3.43 41 1Are 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? No 43 Depth of forebay at entrance(inches) 66 in 44 Depth of forebay at exit(inches) 60 in 45'Does water flow out of the forebay in a non-erosive manner? Yes 46 Width of the vegetated shelf(feet) 6 ft 471 Slope of vegetated shelf(H:V) i 6:1 48 Does the orifice drawdown from below the top surface of the Yes permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1- 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? 1 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 Fescue or Centipede 54 Has a planting plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 4 3:58 PM 6/25/2024