SW6231103_Supplement-EZ Form_20240605

SUPPLEMENT-EZ COVER PAGE
E£7RM5 LOADED
PROJECT INFORMATION _
1 Project Name Godwin Subdivision
_ 2 Pruject AprEa(ac) 31.53
3 Coastal Wetland Ama•(ac) p
4 Surface Water Area{aC] 0
5 Is this project High or Low Density" Hi,k
6 1 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003.(4) —
7 !Width of vegetated setbacks provided(faaet) _ 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 :Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 Infiltration System
12 i Bioretention Cell
13 Wet Pond 1
14 1Stormwater 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: Donald L.Curry,Jr., PE/Pro ect Manager
28 Ur an¢ation: Curry Englnee6ng
29 Street address: _ 205 S.Fuqua Fuquay Ave.
30 1Cit.,State,ZIp: ~I Fu ua -Varina,NC 27526
31 !Phone number(s): — — 919-552-0849
32 1 Email: [e-mail]
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.
Oes_e�ner
f' x
1�r
Signature of Designer
or
Sea! Date

DRAINAGE AREAS
t Is this a hlgh densit project? I Yes
2 If so,number of drainage areas/SCMs 1 1
3 Does this projea 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 Tvpe of SCM Wet Pond Wet Pond
5 Total drainage area(sg ft 1142815 1094463
6 Onsite drainage area(sq ft 1142815 1094463
7 Offsite drainage area(sq ft) 0 0
nNew
l BUA in ro ect s ft) 496913 sf 496913 sf
BUA on subdivided lots(subject to permitting)
348000 sf 348000 sf
New BUA not on subdivided lots(subject to
10 ermittin )(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(sg ft 500 sf 500 sf
Roof(sq ft sf sf
Roadway s 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(sg 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 Permittin )(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 Desi n storm inches 1.0 in 1.0 in
20 Design volume of SCM cu ft) EHE] 41829 cf 41829 cf
21 Calculation method for design volume Simple Simple
ADDITIONAL INFORMATION
Please use this epaco to provide any additional information about the
22 ldrainage 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
1 i Is this a high densi project? _ Yes R I
2 If so,number of drainage areas/SCMs 1
3 Does this roject have low density areas? I 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
4 !Type of SCM Wet Pond
5 Total drainage area(sq ft 1142815
6 Onsite drainage areas ft 1142815
7 Offsite drainage area(sq ft 0
8 Total BUA in pr9ject Lsq ft 496913 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft 348000 sf
kNew BUA not on subdivided lots(subject to
10 ermittin )(sf) 148913 sf
11 Offsite BUA(sq ft) sf
12 Breakdown of new BUA not on subdivided lots:
Parkin s ft 2745 sf
Sidewalk(sq ft) 500 sf
Roof(sq ft sf
Roadway(sq ft 145186 sf
i -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 ft) sf
Existing BUA that will remain(not subject to
15 permitting)(sq ft) sf
16 Existinq BUA that is already permitted(sq ft) sf
17 Exis ing 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 1 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
2 Mlnimum required treatment volume(cu ft) 41628 cf
iGENERAL MSC FROM ON.9rl4ti
3 Is the SCM sized to treat the SW ffom all surfaces at build-out? Yes
4 Is the SCM located away from contaminated sails? 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 Yes
side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes
(10-year storm)?
6 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9 What is the method for dewaterin2 the SCM for maintenance? Pum referred
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 me drainage easement comply with General MDC(9)? Yes
If the SCM is on a single family lot,does(will?)the plat comply with No
13 General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes
151 Is there an O&M Plan that complies with General MDC It 2)? Yes
161 Does the SCM follow the device specific MDC? Yes
17lWas the SCM designed by an NC licensed Rrofimfonall Yes
POW tiAOC FROM 02114 IM _
18 Sizing method used SA/DA
j 191 Has a stagielstmage table been prtMcled in the calculations? Yes
201 Elevation of the excavated main pool depth(bottom of sediment 132.50
removal)(frt*
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 133.50
[ 221 Elevation of the bottom of the vegetated shelf fmsl 137.50
_231Elevation.ofthe permanent pool(fmsl) 138.00
241 Elevation of the top of the vegetated shelf(fmsl) 1 138.50
25'Elevatlonofthatempora of(fmsl) 139.30
26 Surface area of the main permanent pool(s uare feet) 25639
27 volume of the main pefmanent poot(cubic feet) 113076 of
28.Average depth of the main pool(feet) _ 4.94 ft
29 Avera a depth equation used Equation 3
301 If using equation 3,main pool perimeter(feet) 699.0 ft
311 If using equation 3,width of submerged veg.shelf(feet) 3.0 ft
321VOlume of the forebay(cubic feet) 6286 cf
33 Is this 15-20%of the volume in the mainpool? Yes
34 Clean-out depth for forebay inches 12 in
35 Design volume of SCM(cu ft) 46094 cf
36 Is the outlet an orihoe or a weir? OrMce
37 If orifice,orifice diameter(inches) 3 in
38 If Weil`,weir height Inches) in
39 If weir,weir length(inches) in
40 Drawdown time for ft temporary pool(days) 3.43
41 Are the inlet(s)and outlet located in a manner that avoids short-
circuiting? Yes
421Are berms or baffles provided to improve the flow path? No
43 De th.pf Lora at entrance(inches) 36 in
44 Depth of forebay at exit(inches) 30 in
45 Does water flow out of the forebay in a non-erosive manner? Yes
46 Width of the vegetated shelf(feet) 6 ft
47 Slope of vegetated shelf(H: 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- Yes
r,24-hr storm?
Are fountains proposed?(If Y,please provide documentation that No
50 MDC(9)is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes
521Are the dam and embankment planted in non-clumping turf grass? Yes
53I Species of turf that will be used on the dam and embankment Fescue or
Centipede
54 Hasa planting plan been provided for the ve
getated shelf? i Yes
,ADDITIONAL INFORMATION
551 Please use this space to provide any additional information about the
wet pond(s):
Wet Pond 1 3:22 PM 6/5/2024