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Home My WebLink AboutSW6230705_Supplement-EZ Form_20230831 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name Serenity Subdivision Ph.3-5 2 Project Area(ac) 163.07 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 1.26 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) 100&200 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 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: ' 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 5 14 Stormwater Wetland 15 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 Name and Title: C.Scott Brown,PE 28 Organization: 4D Site Solutions Inc. 29 Street address: 409 Chicago Dr.Ste.112 30 City,State,Zip: Fayetteville,NC 28306 31 Phone number(s): 910-426-6777 32 Email: sbrown@4dsitesolutions.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 Signature of Designer Seal Date DRAINAGE AREAS r5 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs _ 5 3 Does this project have low density areas? _ Yes 4 If so,number of low density drainage areas _ 1 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 5 4 Type of SCM Wet Pond Wet Pond 12 Wet Pond 13 Wet Pond 14 _ Wet Pond 15 Wet Pond 16 _ 5 Total drainage area(sq ft) 7214239 450039 978807 658114 703037 548797 6 Onsite drainage area(sq ft) 7158322 427950 950020 653073 703037 548797 7 Offsite drainage area(sq ft) 55917 22089 28787 5041 0 0 8 Total BUA in project(sq ft) 1613505 sf 192624 sf 472872 sf 312662 sf 308868 sf 285107 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) _ 955992 sf 120792 sf 282780 sf 186180 sf 190000 sf 163840 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 657513 sf 71832 sf 190092 sf 126482 sf 118868 sf 121267 sf 11 Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) -Sidewalk(sq ft) 129319 sf 13086 sf 35254 sf 26443 sf 23771 sf 24372 sf -Roof(sq ft) -Roadway(sq ft) 417613 sf 46238 sf 117534 sf 81843 sf 75097 sf 74322 sf -Future(sq ft) 20000 sf 20000 sf -Other,please specify in the comment box below(sq ft) 90581 sf 12508 sf 17304 sf 18196 sf 20000 sf 22573 sf New 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 43% 48% 48% 44% 52% 19 Design storm(inches) 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in 20 Design volume of SCM(cu ft) 16322 cf 39544 cf 26192 cf 26094 cf 23670 cf 21 Calculation method for design volume Simple Simple Simple Simple Simple ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Other impervious listed is for the surface water of the pond. DRAINAGE AREAS r5 1 Is this a high density project? Yes 2 If so,number of drainage areas/SCMs _ 5 3 Does this project have low density areas? _ Yes 4 If so,number of low density drainage areas _ 1 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site LD 1 4 Type of SCM Wet Pond 5 Total drainage area(sq ft) 7214239 3875445 6 Onsite drainage area(sq ft) 7158322 3875445 7 Offsite drainage area(sq ft) 55917 8 Total BUA in project(sq ft) 1613505 sf 41372 sf New BUA on subdivided lots(subject to 9 permitting)(sq ft) 955992 sf 12400 sf New BUA not on subdivided lots(subject to 10 permitting)(sf) 657513 sf 28972 sf 11 Offsite BUA(sq ft) 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) -Sidewalk(sq ft) 129319 sf 6393 sf -Roof(sq ft) -Roadway(sq ft) 417613 sf 22579 sf -Future(sq ft) 20000 sf -Other,please specify in the comment box below(sq ft) 90581 sf New 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 1 19 Design storm(inches) 20 Design volume of SCM(cu ft) 21 Calculation method for design volume ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): Other impervious listed is for the surface water of the pond. WET POND ii Drainage area number 12 13 15 16 2 Minimum required treatment volume(Cu ft _ 16322 cf I 39544 cf I 26114 2 cf I 26094 cf I 23670 cf J GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? _ Yes Yes _ Yes Yes Yes 4 Is the SCM located away from contaminated soils? _ Yes Yes _ Yes Yes Yes 5 What are the side slopes of the SCM(H:V)? _ 3:1 3:1 3:1 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other No No Yes No Yes engineered side slopes? _ 7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes Yes (10-year storm)? _ 8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes Yes design volume? 9 What is the method for dewatering the SCM for maintenance? _ Pump(preferred) Pump(preferred) Pump(preferred) Pump(preferred) Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? _ Yes Yes _ Yes Yes Yes 11 Does the maintenance access comply with General MDC(8)? _ Yes Yes _ Yes Yes Yes 12 Does the drainage easement comply with General MDC(9)? Yes Yes _ Yes Yes Yes 13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A N/A N/A General MDC(10)? 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? _ Yes Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC? _ Yes Yes Yes Yes Yes 17 Was the SCM designed by an NC licensed rofessional? Yes Yes Yes Yes Yes WET POND MDC FROM 02H.1053 18 Sizing method used SA/DA SA/DA SA/DA SA/DA SA/DA 19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 306.50 301.50 297.50 290.50 273.50 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 307.00 302.00 298.00 291.00 274.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 312.00 307.00 302.50 295.00 279.00 23 Elevation of the permanent pool(fmsl) 312.50 307.50 303.00 295.50 279.50 24 Elevation of the top of the vegetated shelf(fmsl) 313.00 308.00 303.50 296.00 280.00 25 Elevation of the temporary pool(fmsl) 313.72 309.42 304.75 296.79 281.01 26 Surface area of the main permanent pool(square feet) 12508 20932 13784 20647 15446 27 Volume of the main permanent pool(cubic feet) 34387 cf 68687 cf 40930 cf 61869 cf 51599 cf 28 Average depth of the main pool(feet) 3.60 ft 4.10 ft 3.80 ft 3.70 ft 4.20 ft 29 Average depth equation used Equation 2 Equation 2 Equation 2 Equation 2 Equation 2 30 If using equation 3,main pool perimeter(feet) 31 If using equation 3,width of submerged veg.shelf(feet) 32 Volume of the forebay(cubic feet) 5917 cf 12614 cf 7757 cf 9586 cf 9538 cf 33 Is this 15-20%of the volume in the main pool? Yes Yes Yes Yes Yes 34 Clean-out depth for forebay(inches) 54 in 54 in 50 in 45 in 54 in 35 Design volume of SCM(cu ft) 16859 cf 46440 cf 27108 cf 28193 cf 25856 cf 36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice Orifice 37 If orifice,orifice diameter(inches) 2 in 3 in 3 in 3 in 3 in 38 If weir,weir height(inches) 39 If weir,weir length(inches) 40 Drawdown time for the temporary pool(days) 2 2.8 2 2.1 2.2 41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes Yes Yes circuiting? 42 Are berms or baffles provided to improve the flow path? No No No No No 43 Depth of forebay at entrance(inches) 89 in 86 in 73 in 78 in 87 in 44 Depth of forebay at exit(inches) 73 in 74 in 67 in 61 in 73 in 45 Does water flow out of the forebay in a non-erosive manner? No No No No No 46 Width of the vegetated shelf(feet) 6 ft 6 ft 6 ft 6 ft 6 ft 47 Slope of vegetated shelf(H:V) 6:1 6:1 6:1 6:1 6:1 48 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes Yes permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes Yes yr,24-hr storm? 50 Are fountains proposed?(If Y,please provide documentation that No No No No No MDC(9)is met.) 51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes Yes Yes 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes Yes 53 Species of turf that will be used on the dam and embankment centipede centipede centipede centipede centipede 54 Has a planting plan been provided for the vegetated shelf? Yes Yes _ Yes Yes Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 55 the wet pond(s): Wet Pond 1 1:41 PM 8/31/2023