SW6221002_Supplement-EZ Form_20230214

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
2
3
4
5
6
Project Name
Project Area {ac}
_Coastal Wetland Area (ac)
Surface Water Area (ac)
Is this project High or Low I]enslty?
Does this projBCt use an off -site SCM?
COMPLIANCE WITH 021-11.9003(4)
7 ! Width of vegetated_ setbacks provided (feet) _
8 Will the vegetated setback remain vegetated?
9 If BUA is propmed in the setback, does it meet NCAC 02H.1003(4)(c-d)?
10 Is streambank stabilization proposed'. on this-1)miect?
Avonlea Subdivision
21.74
0 T -
0 _
Huh
No
30'
WA
N/A
No
NUMBER AND TYPE OF SCMs:
11 Infiltration System _ T
12 Bioretention Cell
13 iWet Pond 2
14 IStormwater Wetland
15 ;Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting RWH
18
Green Roof
19
Level Spreader -Filter Strip (LS-FS)
Disconnected Impervious Surface (DIS)
20
21
Treatment Swale
22 Dry Pond
23 StormFilter
24 Silva Cell
25 , Bayfilter
26 Filterra
FORMS LOADED
DESIGNS CERTIFICATION
27 Name and Title-
28 i Organization:
29 'Street address:
30 City, State, Zip:
31 Phone numbers :
32 Email:
Donald L. Cu :. Jr., PE / Project Manager
Curry Engineering___
205 S. Fuguay Ave.
Fu ua -Varina NC 27526
919-552-0849
don@cu"eng.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.
LiDI2ii:i l
1�ti�v
Seal
C260'a4e
Signature of Designer
Date

DRAINAGE AREAS
1 'is this a high -density project?
Yes
2 If so, number of drainage areas/SCMs
2
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
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
7
2
4
Tyoe of SCM
Wae Pane
Wet Pond
Wet Pond l
5
Total drainage area (sq ft)
9469M
_
528385
272687 1JI
6
Onsite drainage area (sq ftL
946998
528385
—
272687
y 7
Offsite drainage area (sq ft) _
_
-
0
6
Total BUA in project (sq ft)
46_4009 sf
283294 sf
_0
165756 sf
New BUA on subdivided lots (subject to permitting)
9
(sq ft)
309000 sf
198000 sf
111000 sf
_
New BUA not on subdivided lots (subject to
_
10
permitting) (sf)
155009 sf
85294 sf
54756 sf
11
Offsite BUA (sq ft)
sf
sf
sf
12
Breakdown of new BUA not on subdivided lots:
- Parking(sq ft) _
3pp© s(
300p sf
s{
- Sidewalk sq ft_)
37744 of
_ _
17774 if
13315 sf
Roof (sq ft)
sf
_
sf
sf
Roadway (sq ft)
104265 sf
$4520 sf
41441 sf
Future (sq ft)
sf
_
sf
of
Other, please specify in the comment box below
(sq ft)
10000 sf
10000 sf
sf
New infiltrating permeable pavement on subdivided
13
lots (sq ft)
Sr
sf
of
New infiltrating permeable pavement not on
14
subdivided lots (sq ft)
sf
sf
of
115
Existing BUA that will remain (not subject to
_
permitting) (sq ft)
Sf
of
g}
of
sf
sf
of
sf
sf
96 Existing BUA that is already permitted (sq ft)
17 Existing BUA that will be removed (sq ft)
18
Percent BUA
54%
1.0 In _
25330 of
i le
49%
.0 in
of
d
61%
1.01n
i 15423 d�
Simpla
19 Design storm (inches)
_
20 Demon volume of SCM (cu ft)
21 Calculation method for design volume
ADDITIQNALJNF0RMATi0N
_
Please use this space to provide any additional information about the
22
drainage area(s)-
Pond #1: 1oxo sf Impervious allocated for —amen ft-y

WET POND
- 1 Drainage area number
1
2
—
2 Minimum required treatment volume cu ft
23674 CT
_
13793 cf
GENERAL MVC FROMON
the SCM sized to treat the SW from all surfaces at build -out?
3;lsVs
Yes
the SCM located away from contaminated soils?
_YBS
Yea
Yes
5What are the side slopes of the SCM (H:V)?
_
3;1
3:1
_
6 Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
N4
No
Are the infers, outlets, and receiving scream protected from erosion
7i f 10-year storm)?
Yes
Yes
—
I Is there an overflow or bypass for Inflow volLime In excess of the
_ a!! et! volume?
Yes
Yes
Pump (preferred)
9 What is the method for dewatering the SCM for maintenance? _ pump (preferred)
10 If applicable, will the SCM Ge cleaned out after construction?
Yes
Yes
11, Does the maintenance access comply with General MDC (8)?
_
Yes
Yes
-12 Does the drainage easemnt ecomply with General MDC (9)?
Yes
_
13 If the SCM Ps.on a single family lot, does (will?) the plat comply with
General MDC (10)?
No
No
14 Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
15 Is there an O&M Plan that compilesvAth (3aneral MDC (12)?
Yes
Yes
16 Does the SCM follow the device speclftr MDC?
_Yes
Ys_
17 Was the_SCM dew -ned by an NC licensed �fe@5ional7
- - --- -
Yes
Yes
wrrpmo MSCFROM 02H ado
18 Sizing method used SA/DA
19 Has a stagelslorage table been provided in the calculations? Yes
20 Elevation of the excavated main pool depth (bottom of sediment 170.50
removal) (fmsl)
SAIDA
Yes
167.00
21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 171.50
168.00
22 Elevatlan or the bottom of the Vegetated shelf final) - 176.00
172.50
173.00
231 Elevation Of the permainefft pool fmsl) 176,50
_
24 Elevation of the toe of the vegetaled shelf (fms)J 177.00
25 Elevation of the tem rary pool (tm_sl) _ — 178,00
26 SLirfacearea of the main permanent pool (s[guarefeet) 114_$0
27 Volume of the main permanent pool (cubic feet) 31572 of
173.50
174.30
773i{
21812 of
28 Average depth of the main pool (feet) 3,23 ft
29 Average depth equation used Equation 3
3,2&ft
Equation 3
396.0 ft
30 If using equalion 3, main o-W perimeter {feet)
594.0 ft
31 If uslnAequaflon 3, w_fdth of subrwV_W v . shelf: {
32: Volume of the forebay (cubic feet)
3.0 ft
3.0 ft
48B2cf
4070 cf
33'
Is this 15�20% of" volume in the main pool?
Yes
Yes
34
Clean -out de th forrforeba inches)
S6 in
36 in
35
Design volume of SCM (cu ft) 25330 cf
15423 cf
36.Is the outlet an orifice or a weir? Orifice
Orifice
37 If urfrrce, orifice diameter {Inches 2 in
2 in
38 If weir, weir het hchtt (inches) bt:
39 If weir, weir I h Cirlohes) _ in
40; Drawdoyvn time for the temporary! i7ni { ) &12;
In
In
3.37
41 Are the inlet(s) and outlet located in a manner that avoid7 s short- Yes
grculti
Yes
42 Are berms or baffles provided to Impra the flow path? Yes
No
dal f fa, h of fr m-hay at entrance (Incher) 48 in
48 in
44 Depth of forebay at exit {inches) 36 in
45 Does water flow out of the forebay in a non -erosive manner? J Yes
36 in
Yes
46 Width of the vegetated shelf feet 6 ft
6 ft
47 Slope of vegetated shelf (N-V) 6:1
48 Does the office drawdown from below the top surface of the Yes
permanent pool?
6:1
Yes
49.
Does the pond minimize impacts to the receiving channel from the 1-
r, 24-hr storm? Yes
Yes
50'Am fountains proposed? (If Y, please provide documentation that No
MDC 9) is met
No
51 Is a trash rack or other device provided to protect the outlet system? Yes
Yes
52 Are the dam and embankment planted in non -clumping turf grass? Yes
Yes
53 Species of turf that will be used on the dam and embankment Fescue or
_ Centipede
Fame or
Ceftilwe
54 Hasp Ianti n Ian been provided for the vegetated shelf?
Yes _ Yes
_a
ADDITIONAL. INFORMATION
55 Please use this space to provide any additional information about the
wet pond(s)
'WPbt orifice = 2.25" [ref line 37). WPp2 orifice = 1.75" (ref. Irte 37)
Wet Pond 3 3:12 PM 2/14/2023