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Home My WebLink AboutSW5240104_Supplement-EZ Form_20240206 SUPPLEMENT-EZ COVER PAGE FORMS LOADED `PROJECT INFORMATION 1 'Project Name _ Green Hill Subdivision 2 1Project Area(ac) 123.94 3 Coastal Wetland Area(ac) 4 ,Surface Wales Ai ea OE) _ 2.57 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 1 Width of vegetated setbacks provided feet) Varies 8 I Will the vegetated setback remain vegetated? I 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 14 Stormwater Wetland 6 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: Jon Frazier,PE/Principal 28 Organization: _ _ FLM Engineering,Inc. 29 Street address: PO Box 91727 30 City,State,Zip: Raleigh,NC 27675 31 Phone number(s): 919.610.1051 32 Email: jfrazier@flmengineering.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 ,rrrrlllg,, GNR004/ '„, 53 11 5 ;w Signature oef igner v 03 • Q, ......... A � 0-- ( 4 I 24 Seal Date c�. I "yu "�Op m w m I f0 O S coo e' 8,.m.. RP-2 ,-p r.o, TA io `m m U m 'b 5 5.0N N O v1 N m O 1� j O V''rlinq V'U to N N N5 I 2 mm ' miter= N AZ n 3s% aoa� �m , o r o o, O , , , , , I I �m " N t V� O aOiep N 3 � o (' r ON , P N "'U1 m, ,O n, liut M I!1 m= m sw. w EN. a .5 @ m 3m m N N W v -Kn n�pm U U 6 m 4V t ; !: !: Q mO Yl) Q+mb . ,' ZZ mm m OFg, m1= 40m .- N .40 m p - m E 2 A 2 m o D ,n° o g t w m D �$ W O U m O c y U P m 13 H N m w n E IIi !1 i cn om E 4 W u' 3 � o � � � ° v s . d m 0.ad uw n ce .;� o m 2 uo�'uoi w t = u 'm m E so, g a o m Q m D 1, N` o m Q �'R 3�m - m m'-D in E^.E N 7E, 0 yy W G A OI�O � Z 10 m m O j CO r,2 =, O' N d N a�J L w L L C O L n --L ^ 1 y N Z m Oi O, 0 o V w N m m.. O�.5-._. a._ m ppCC 3 V I='. E',n... aa 0c0c o .o__ y`d .COCOA QQ¢ EEEIW uo < nc a.ETi _ pJUcmT o� c�¢ omon m._' zlmvm600000o? c N- mo Z - N j W 2 , d m l'Y] m= .Y m O O—j.L. 3 C > C C_ C 1 v'i C, N Q o m y �° 3 E 3 = d02 w i�Ir lL 0 E E . E .0 E.0 .< o o m m m N m m ,, m N m m m m, 5 2 N a ` �rl-O�J�Z aZ o.,Om _ az 2 �w °�w Wi1�0U��a�'m LQL N(�1 N N O W f`m O) 0 N-N C V N W t-M 0I O 1° N t STORMWATER WETLAND Drainage area nuinbet _ 1 i{- 2 3 4 5 6 .Minimum required treatment volume(cu ft) 17816 v1 1 28005 cf I 10003 cf 13983 cf I 23609 cf I 9845 cf 6.9tERA6Rn_______ ____. - 3 Is the SCM sized to treat the SW from all surfaces at bulld-oul7 Yes Yes , Yes Yes Yes Yes 4 Is the SCM located awayfrom contaminated soils? Yes Yes Yes Yes Yes Yes &What are the side slopes of the SCM(H V)? 3 1 3:1 3:1 3:1 3:1 3:1 6 Does the SCM have retaining walls,gabion walls or other No No No No No No engineered side slopes? , 7 Are the inlets,outlets and receiving stream protected from erosion Yes 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 Yes _ design volume? _ 9 What is the method for dewalering the SCM for maintenance? Pumpjprefen ed) Pump(preferred_) Pump(preferred) Pump(Preferred) Pumoo(preferred) Pump(preferred) 10 If applicable,will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes _ _ Yes 11 Does the maintenance access comply with General MDC(8)? Yes Yes Yes Yes Yes Yes 12 Does the drainage easement comply with General MDC(9)? Yes Yes Yes Yes Yes Yes 13 If the SCM is on a single family lot does(will?)the plat comply with Yes Yes Yes Yes Yes Yes )General MDC(10)? 14i Is there an 0&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes Yes 14Is there an 0&M Plan that complies with General MDC(12)? Yes Yes Yes Yes Yes Yes 16 Does the SCM follow the device specific MDC?' Yes Yes Yes Yes — Yes Yes 17'Was the SCM designed by an NC licensed professional? Yes Yes • Yes Yes Yes Yes STORIYR S.=9OTIMRPORErFIMOMt1ZN.IOS4 - — _ I 8 Design volume of SCM cu It) 18367 26691 11006 14380 25126 10227 191 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes Yes Yes Yes circuitina? 20 Are berms or baffles provided to improve the flow path? Yes _ Yes Yes Yes Yes Yes z l Does the orifice drawdown from below the top surface of the f Yes Yes Yes Yes Yes Yes oermanenl cool? 22'Does the wetland minimize impacts to the receiving channel from the - Yes Yes Yes Yes Yes Yes 1-er 24-hr storm? 23I Is a trash rack or other device provided lo protect the outlet system? Yes Yes Yes Yes Yes Yes tlevutltas 24f Elevabon,peak attenuation above temporary pool(if applicable) 194-63 198.75 224.66 223-46 212.96 191.88 j(fmsll) 25 Elevation,temporary pool(top of the temporary inundation zone) 194.25 198.25 224 25 222 25 21225 1,25 Ifmsl) 26tElevation.permanent pool,(top of the shallow water zone)(fmsl) 193.00 197 00 223,00 221 00 211 00 27'Elevation,bottom of shallow water zone(fmsl) ! 192-25 196 25 222,25 220 25 210 25 -0.75 28 Elevation,bottom of forebay deep pool at deepest point(at forebay 189 67 193 67 219.67 217.67 207 67 -3 33 entrance)(fmsl) 25 Elevation,bottom ofTorebay deep pool at shallowest point(at 191-00 195 00 221.00 219.00 209.00 -2.00 forebay exit)(fmsl) 30:Elevattort bottom of non-forebay deep pool at deepestpoinl fmsl) ! 190.00 - 194.00 220.00 218-00 208.00 -3 00 Plantinglonts _ _ `Area,total surface area of the SW wetland at temporary pool elev_31 f(g Vie) 17,518 00 22,429.00 9,513.00 12,435.00 21,440_00 8,884.00 32 Area.temporary inundation zone at temporary pool elev.(so ft) 6,131.00 7,850.15 3.329.55 4,352.25 7,504.00 3.109.40 33 Area.shallow water zone al temporary pool elev.(sq ft) 6,131.00 7,850.15 3,329 55 4,352.25 7,504 00 3.109 40 34 Area forebay at temporary pool elev(sq R) 2,828.00 3„36435 1.426.95 1,865.25 3,216.00 1.332.60 35 Area:non-forebay deep pool at temporwy pool elev (sq ft) 2,828,00 3 364-35 1,426 95 1.865.25 3,216 00 1.332 60 38 Percent area provided,temporary inundation zone(should be 30- 35% 35% 35% 35% 35% 35% 45%) 37 Percent area provided_shallow water zone(should be 35.45%) 35% 35% 35% 35% r 35% 3596 •38'Percent area provided,deep pool(forebay)(should be 10-15%) 15% 15% 15% 15% 1596 _ 1596 39j Percent area provided,deep pool(non-forebay)(should be 5-15%1 15% 15% _ 15% 15% 15% - 15% Depths and Outlet 40 Peak attenuation depth above temporary inundation zone(inches) 24 in 24 in 24 in 24 in 24 in 24 in 41 Temporary inundation zone depth(temporary pool to permanent 15 in 15 in 15 in 15 in 15 in 15 in pool)Illy hns) 42 Shallow water zone depm(permanent pool to bottom of wetland) 9 in 9 in 9 in 9 in 9 in 9 in (inches) 43 Depth,forebay at entrance(permanent pool to bottom of forebay 40 in 40 in 40 in 40 in 40 in 40 in entrance)(inches) 44 Depth,forebay at exit(permanent pool to bottom of forebay exit) 24 in 24 in 24 in 24 in 24 in 24 in (jnch=sl 45 Depth,non-forebay deep pools(permanent pool to deep pool 36 in 36 in 36 in 36 in 36 in 36 in bottom)(inches) _ 46 If thoro is on orifioo,diomotor(inches) I 2 in 3 in 2 in 2 in 3 in 2 in. 47 If there is a weir,weir height(inches) 48 If there is a weir,weir length(inches) 49 Orewdown erne for the temp rery-pool(days) 3,4 2 3-3 2.4 _ 2.7 3.1 Soil and phsgs _ 50 Soil amendment depth(Inches) 12 in 12 in 12 in 12 in 12 in 12 in 51 Has a soil amendment specification been provided? Yes Yes Yes Yes Yes Yes 52 Has a landscaping plan that meets SW Wetland MDC(12)been C Yes Yes Yes Yes Yes Yes nrevided? 53 Number of plants-per 200 a feel(4)in the shallow water zone 541Does the temporary inundation zone planting comply with SW Yes Yes Yes Yes Yes Yes Wetland MDCf4)? 55(Are the dam structure and temporary fill slopes planted in non- Yes Yes Yes Yes Yes Yes clumping turfgress? 58 Will yetlails be gal'led iii the wetlei id? No Nu Nu No No No ADDITIONAL INFORMATION 57 Please use this space to provide any additional information about the stormwater wetland(s) Stormwater Wetland#5 drawdown orifice is 2.5 in(rounded up to 3 in in line 46).and Stornwater Wetland#6 drawdown orifice is 1 5 in(rounded up to 2 in in line 46). Wetland 3 1:37 PM 10/31/2023