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Home My WebLink AboutSW3240801_Supplement-EZ Form_20241118 SUPPLEMENT-EZ COVER PAGE LOAD SUPPLEMENT FORMS PROJECT INFORMATION 1 Project Name Adelina Phase 1 2 Project Area(ac) 81.84 3 Coastal Wetland Area(ac) N/A 4 Surface Water Area(ac) 17.05 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&100 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? Yes NUMBER AND TYPE OF SCMs: 11 Infiltration System 12 Bioretention Cell 13 Wet Pond 4 14 Stormwater Wetland 15 Permeable Pavement 16 Sand Filter 1 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 LOAD SUPPLEMENT FORMS DESIGNER CERTIFICATION 27 Name and Title: Matthew R.Reiking,Division Manager 28 Organization: ESP Associates,Inc. 29 Street address: 3475 Lakemont Blvd. 30 City,State,Zip: Fort Mill,SC,29708 31 Phone number(s): (803)802-2440 32 Email: Mreiking@ESPAssociates.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 ``� N"CA �,,�� \��ttttllff4 Q •.. ..• lid/�j \\ \ a, ��iii �i Signature of Designer i LICENSE NO.: i _ E A L •. - ; F-1407 = = // 038830 • = •`'o '. •\�C�`�� %� GIg Seal Date 2024.10.31 20:48:40-04'00' DRAINAGE AREAS 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? _ No 4 If so,number of low density drainage areas _ Is all/part of this project subject to previous rule 5 versions? No FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 5 4 Type of SCM Wet Pond Wet Pond Sand Filter Wet Pond Wet Pond 5 Total drainage area(sq ft) 3,284,860 1,095,098 823,284 213,444 468,706 684,328 6 Onsite drainage area(sq ft) 3,284,860 1,095,098 823,284 213,444 468,706 684,328 7 Offsite drainage area(sq ft) 0 0 0 0 0 0 8 Total BUA in project(sq ft) 1,352,545 392,868 347,762 96,512 238,361 277,042 New BUA on subdivided lots(subject to 387,145 80,330 166,025 2,748 111,034 27,008 9 permitting)(sq ft) New BUA not on subdivided lots(subject to 591,931 150,099 182,764 70,451 128,556 60,061 10 permitting)(sf) 11 Offsite BUA(sq ft) - - - - - - 12 Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 127,833 18,113 46,764 0 50,504 12,452 -Sidewalk(sq ft) 111,787 36,122 29,808 20,162 15,075 10,620 -Roof(sq ft) 0 0 0 0 0 0 -Roadway(sq ft) 352,324 95,864 106,205 50,289 62,977 36,989 -Future(sq ft) 0 0 0 0 0 0 -Other,please specify in the comment box _ _ _ _ _ _ below(sq ft) _ New infiltrating permeable pavement on 13 subdivided lots(sq ft) N/A N/A N/A N/A N/A N/A New infiltrating permeable pavement not on 14 subdivided lots(sq ft) N/A N/A N/A N/A N/A N/A Existing BUA that will remain(not subject to 15 permitting)(sq ft) N/A N/A N/A N/A N/A N/A 16 Existing BUA that is already permitted(sq ft) N/A N/A N/A N/A N/A 17 Existing BUA that will be removed(sq ft) N/A N/A N/A N/A N/A N/A 18 Percent BUA 36% 42% 45% 51% 40% 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) 34,097 29,501 14,249 19,823 23,631 21 Calculation method for design volume HRT HRT DEQ HRT HRT ADDITIONAL INFORMATION Please use this space to provide any additional information about the 22 drainage area(s): WET POND 2 Minimum required treatment volume(cu ft 165936 cf I 127178 cf I 98895 cf I 103794 cf I GENERAL MDC FROM 02H.1050 3 Is the SCM sized to treat the SW from all surfaces at build-out? _ Yes Yes _ Yes Yes 4 Is the SCM located away from contaminated soils? _ Yes Yes Yes Yes 5 What are the side slopes of the SCM(H:V)? _ 3:1 3:1 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other No Yes No No engineered side slopes? _ 7 Are the inlets,outlets,and receiving stream protected from erosion 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 design volume? 9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice Drawdown Orifice Drawdown Orifice Drawdown Orifice 10 If applicable,will the SCM be cleaned out after construction? _ Yes Yes Yes _ Yes _ 11 Does the maintenance access comply with General MDC(8)? Yes Yes _ Yes Yes 12 Does the drainage easement comply with General MDC(9)? Yes Yes _ Yes Yes 13 If the SCM is on a single family lot,does(will?)the plat comply with Yes Yes Yes Yes General MDC(10)? 14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes 15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC? Yes Yes _ Yes Yes 17 Was the SCM designed by an NC licensed professional? Yes Yes Yes Yes WET POND MDC FROM 02H.1053 _ 18 Sizing method used HRT HRT HRT HRT 19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes 20 Elevation of the excavated main pool depth(bottom of sediment 538.00 502.00 516.00 537.00 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 539.00 503.00 517.00 538.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 546.00 510.00 523.00 547.00 23 Elevation of the permanent pool(fmsl) 546.50 510.50 523.50 547.50 24 Elevation of the top of the vegetated shelf(fmsl) 547.00 511.00 524.00 548.00 25 Elevation of the temporary pool(fmsl) 547.71 511.58 524.60 548.50 26 Surface area of the main permanent pool(square feet) 22943 22559 16697 23111 27 Volume of the main permanent pool(cubic feet) 85245 cf 73263 cf 53819 cf 100083 cf 28 Average depth of the main pool(feet) 6.02 ft 5.41 ft 5.15 ft 7.08 ft 29 Average depth equation used Equation 3 Equation 3 Equation 3 Equation 3 30 If using equation 3,main pool perimeter(feet) 906.0 ft 1029.0 ft 705.0 ft 945.0 ft 31 If using equation 3,width of submerged veg.shelf(feet) 5.0 ft 5.0 ft 5.0 ft 5.0 ft 32 Volume of the forebay(cubic feet) 16926 cf 13884 cf 9298 cf 18933 cf 33 Is this 15-20%of the volume in the main pool? Yes Yes Yes Yes 34 Clean-out depth for forebay(inches) 12 in 12 in 12 in 12 in 35 Design volume of SCM(cu ft) 179068 cf 147735 cf 106017 cf 104412 cf 36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice 37 If orifice,orifice diameter(inches) 2 in 2 in 1.5 in 2 in 38 If weir,weir height(inches) 39 If weir,weir length(inches) 40 Drawdown time for the temporary pool(days) 2.35 2.21 2.84 2.26 41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes Yes circuiting? 42 Are berms or baffles provided to improve the flow path? Yes Yes Yes Yes 43 Depth of forebay at entrance(inches) 108 in 108 in 96 in 132 in 44 Depth of forebay at exit(inches) 102 in 102 in 90 in 126 in 45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes Yes 46 Width of the vegetated shelf(feet) 10 ft 10 ft 10 ft 10 ft 47 Slope of vegetated shelf(H:V) 10:1 10:1 10:1 10:1 48 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes permanent pool? 49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes yr,24-hr storm? 50 Are fountains proposed?(If Y,please provide documentation that 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 52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes 53 Species of turf that will be used on the dam and embankment Tall Fescue Tall Fescue Tall Fescue Tall Fescue 54 Has a planting plan been provided for the vegetated shelf? Yes Yes Yes Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 55 the wet pond(s): Wet Pond 3 10:03 AM 10/29/2024 SAND FILTER 1 Drainage area number 3 2 Minimum required treatment volume(cu ft) 46832 sf 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 Does the SCM have retaining walls,gabion walls or other 6 No engineered side slopes? 7 Are 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? Drawdown Orifice 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 If the SCM is on a single family lot,does(will?)the plat comply with 13 Yes 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 SAND FILTER MDC FROM 02H.1056 18 SHWT elevation(fmsl) N/A 19 Type of sand filter(open or closed) Open 20 If closed,will the filter will be pre-cast or pour-in-place? 21 If closed,top of grate elevation(fmsl) 22 Is this sand filter designed to attenuate peak flows? Yes Sediment Chamber 23 Volume that can be retained in the sediment chamber(cubic feet) 3,418.00 24 Will there be a permanent pool in the sediment chamber? No 25 Bottom of the sediment chamber(fmsl) 555.00 26 Area of the sediment chamber(square feet) 1,956.00 27 Physical depth of the sediment chamber(inches) 24.00 28 Ponding depth in the sediment chamber,above any permanent 36.00 pool(inches) 29 Elevation of top of weir between chambers(fmsl) 557.00 Sand Chamber 30 Volume that can be retained in the sand chamber(cubic feet) 3420 cf 31 Bottom of the sand chamber(fmsl) 552.50 32 Area of the sand chamber(square feet) 2,280.00 33 Physical depth of the sand chamber(inches) 1.50 34 Ponding depth in the sand chamber,above the sand surface 24.00 (inches) 35 Elevation of the bypass device(fmsl) 558.00 36 Type of bypass device Riser 37 Mechanism for distributing flow over the sand surface Sheet Flow 38 Sand specification for sand chamber ASTM C33 39 Depth above underdrain pipe(inches) 24 in 40 Will the media be maintained to drain at least two inches per hour at Yes the sand surface? 41 Is at least one clean-out pipe provided at the low point of each Yes underdrain line? 42,Will clean-out pipes be capped? Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about 43 the sand filter(s): Sand Filter 4 10:03 AM 10/29/2024