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Home My WebLink AboutSW6241001_Supplement-EZ Form_20241029 SUPPLEMENT-EZ COVER PAGE FORMS LOADED PROJECT INFORMATION 1 Project Name FTCC Regional Fire and Rescue Training Center Phase II 2 Project Area(ac) 30.29 3 Coastal Wetland Area(ac) 0 4 Surface Water Area(ac) 0.11 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) N/A 8 Will the vegetated setback remain vegetated? N/A 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 0 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 4 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: Marie Pathmanathan PE,Project Engineer 28 Organization: Stewart Inc. 29 Street address: 223 S West St,Suite 1100 30 City,State,Zip: Raleigh,NC,27603 31 Phone number(s): (919)866 4758 32 Email: mpathmanathan@stewartinc.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 O • •ESS/ Q 9<'• Signature of Designer SEAL 053759 • 2 eq- GINE . Q \� ///F�•• PATHMPs\.\\' 10.03,2021 Date 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 0 Is all/part of this project subject to previous rule 5 versions? No I FORMS LOADED DRAINAGE AREA INFORMATION Entire Site 1 2 3 4 5 Vegetated Swale Vegetated Swale Vegetated Swale Vegetated Swale 4 Type of SCM Wet Pond(DA1) (DA2) (DA3) (DA4) (DA5) _ 5 Total drainage area(sq ft) 334229 177557 60579 23514 10944 61635 6 Onsite drainage area(sq ft) 334229 177557 60579 23514 _ 10944 61635 _ 7 Offsite drainage area(sq ft) 0 0 0 0 8 Total BUA in project(sq ft) 248550 sf 154177 sf 38597 sf 9800 sf 9746 sf 36230 sf New BUA on subdivided lots(subject to permitting) 9 (sq ft) 159881 sf 75977 sf 38597 sf 9800 sf 9746 sf 25761 sf New BUA not on subdivided lots(subject to (4##permitting)(sf) _ N/A N/A N/A N/A N/A N/A ####Offsite BUA(sq ft) ####Breakdown of new BUA not on subdivided lots: -Parking(sq ft) 38597 sf 38597 sf -Sidewalk(sq ft) _ -Roof(sq ft) 9800 sf 9800 sf -Roadway(sq ft) — _ 154177 sf 9746 sf 4225 sf _ -Future(sq ft) -Other,please specify in the comment box below(sq ft) New infiltrating permeable pavement on ####subdivided lots(sq ft) New infiltrating permeable pavement not on ##t#k subdivided lots(sq ft) Existing BUA that will remain(not subject to ####permitting)(sq ft) 88669 sf 78200 sf 10469 sf ####Existing BUA that is already permitted(sq ft) _ 88669 sf 78200 sf _ _ _ 10469 sf ####Existing BUA that will be removed(sq ft) ##ff#Percent BUA 340% 87% 64% 42% 89% 59% ####Design storm(inches) 5.0 in 1.0 in 1.0 in 1.0 in 1.0 in 1.0 in ####Design volume of SCM(cu ft) 9653 cf 9653 cf N/A N/A N/A N/A ####Calculation method for design volume SIMPLE : Rational Rational Rational Rational ADDITIONAL INFORMATION Please use this space to provide any additional information about the ####drainage area(s): WET POND 1 Drainage area number 1 I 2 Minimum required treatment volume(Cu ft) 9653 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? Yes 5 What are the side slopes of the SCM(H:V)? 2:1 6 Does the SCM have retaining walls,gabion walls or other engineered No 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? 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 _ If the SCM is on a single family lot,does(will?)the plat comply with 13 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 20 Elevation of the excavated main pool depth(bottom of sediment 78,00 removal)(fmsl) 21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 79.00 22 Elevation of the bottom of the vegetated shelf(fmsl) 85.50 23 Elevation of the permanent pool(fmsl) 85.50 _ 24 Elevation of the top of the vegetated shelf(fmsl) 86.50 25 Elevation of the temporary pool(fmsl) 90.00 26 Surface area of the main permanent pool(square feet) 5558 27 Volume of the main permanent pool(cubic feet) 9653 cf _ 28 Average depth of the main pool(feet) 4.53 ft 29 Average depth equation used 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) 4017 cf 33 Is this 15-20%of the volume in the main pool? Yes _ 34 Clean-out depth for forebay(inches) 6 in _ 35 Design volume of SCM(cu ft) 8799 cf _ 36 Is the outlet an orifice or a weir? Orifice 37 If orifice,orifice diameter(inches) 1.5 in 38 If weir,weir height(inches) 39 If weir,weir length(inches) 40 Drawdown time for the temporary pool(days) 2.82 41 Are 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) 78 in 44 Depth of forebay at exit(inches) 78 in 45 Does water flow out of the forebay in a non-erosive manner? Yes 46 Width of the vegetated shelf(feet) 5 ft 47 Slope of vegetated shelf(H:V) 10:1 _ 48 Does the orifice drawdown from below the top surface of the No permanent pool? 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 _ 54 Has a planting plan been provided for the vegetated shelf? Yes ADDITIONAL INFORMATION 1111111 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 1 4:19 PM 9/30/2024 TREATMENT SWALE 2 number 2 3 4 5 Design gflowerate of SCM(cfs) N/A a I N/A N/A I N/A 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 engineered No No No No 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 No No No No design volume? 9 What is the method for dewatering the SCM for maintenance? 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)? N/A - N/A N/A N/A 13 If the SCM is on a single family lot,does(will?)the plat comply with 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 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 TREATMENT SWALE MDC FROM 02H.1061 18 SHWT elevation(fmsl) 19 Bottom of the treatment swale(fmsl) 89.00 86.00 90.00 93.00 20 Depth of treatment swale(feet) 21 Is the swale trapezoidal in shape? Yes Yes Yes Yes 22 Width of bottom of swale(feet) ft ft ft _ ft 23 Side slopes of treatment swale(H:V) 3:1 3:1 3:1 3:1 24 Length of swale(feet) 164 ft _ 320 ft 70 ft 565 ft 25 Flow depth during the 0.75 inch/hour storm(inches) 26 Flow velocity during the 0.75 inch/hour storm(feet per second) - 27 Hydraulic retention time for swale(minutes) 28 Species of grass that will be used _ 29 Will the grass be maintained at an average height of 6 inches? 30 Will the grass not be cut lower than 4 inches? _ 31 Velocity during the 10-year storm(feet per second) 3.06 ft/s 2.30 ft/s 3.80 ft/s 1.81 ft/s 32 Is the swale designed to non-erosively pass the 10-year storm? Yes Yes Yes Yes ADDITIONAL INFORMATION Please use this space to provide any additional information about the 33 treatment swale(s): TrSwa le 1 4:20 PM 9/30/2024