SW6221203_Supplement-EZ Form_20221220

DocuSign Envelope ID: 239901 C5-5F16-4AF2-9C75-8A6F24EEB3C3
SUPPLEMENT—EZ COVER PAGE
FORMS LOADED
FORMATION
t Name
Coastal Wetland Area (ac)
Surface Water Area (ac)
Is this project High or Low Density?
Does this proiect use an off -site SCM?
Briarwood Park
Low
No
MPLIANCE 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: W9 Fir
11 1 Infiltration System 0
12
Bioretention Cell
0
13
Wet Pond
0
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
Dry Pond
0
22
0
23
Storm Filter
0
0
24
Silva Cell
Ba filter
Filterra
25
0
26
0
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Mike Zaccardo PE
28
Organization:
Timmons Group
29
Street address:
5410 Trinity Road Suite 102
30
City, State, Zip:
Raleigh, NC 27607
31
Phone numbers :
919-532-3281
32
Email:
[e-mail]
Certification Statement:
I certify, under penalty of lawthat 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.
Deslgrner 1 1 1 1 1
2ADFFAl
O `
�'000
,we FNGINEE� Q` `
��V. ii�P`%%%
Seal
DocuSigned by:
OD42ADFFAEBB46B...
Signature of Designer
11/9/2022
Date

DocuSign Envelope ID: 239901 C5-5F16-4AF2-9C75-8A6F24EEB3C3
DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
0
3
Does this project have low density areas?
Yes
4
If so, number of low density drainage areas
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
INFORMATION
4 TypeM
I7Onsite
Entire Site
N/A
LD 1
5
drainage area s ft
7.89
6
a a area s ft
7.89
7
a a area s ft
0
8
n project (sq ft
52365 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
30400 sf
10permitting)
New BUA not on subdivided lots (subject to
s
21965 sf
11
Offsite BUA (sq ft
N/A
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
Sidewalk (sq ft
1000 sf
sf
Roof (sq ft
sf
Roadwa (sq ft
20965 sf
Future (sq ft
sf
Other, please specify in the comment box
below (sq ft
N/A
13
New infiltrating permeable pavement on
subdivided lots (sq ft
N/A
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
N/A
15permitting)
Existing BUA that will remain (not subject to
s ft
N/A
16
Existing BUA that is already permitted (sq ft
N/A
17
Existing BUA that will be removed (sq ft
N/A
18
Percent BUA
15%
19
Desi n storm inches
N/A
20
Design volume of SCM cu ft
N/A
21
Calculation method for design volume
N/A
INFORMATIONuse
this space to provide any additional information about the
"22drainagearea(s):
Full site is considered as one drainage area.

DocuSign Envelope ID: 239901 C5-5F16-4AF2-9C75-8A6F24EEB3C3
LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
1
Is project below density thresholds set forth in the applicable stormwater rule?
Yes
2
Does project maximize dispersed flow and minimize channelization of flow?
Yes
3
Has the use of piping been minimized per.1003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
31
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
3.07
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
8
Bottom width of curb outlet swale(s) (feet)
9
Maximum side slope of curb outlet swale(s) (H:V)
10
Minimum length of curb outlet swale(s) (feet)
11
Are treatment swales used instead of curb outlet swales?
12
Is stormwater released at the edge of the setback as dispersed flow?
N/A
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
lAre variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15 1 Please use this space to provide any additional information about this low density project:
Stormwater runoff will be captured in roadside swales which outlet at the end of the culdesac into scour holes.
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
( % )
Va„ow
(fps)
Va ua ,
(fps)
Flow depth
(ft)
1
1.77
0.70
1.07
0.50
6.95
1.90
5.00
3.07
0.87
2
0.59
0.55
0.04
0.50
2.31
1.90
5.00
2.16
0.58
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30