SW4230101_Supplement-EZ Form_20230526

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT
INFORMATION
Project Name E M Holt ES On -site Queuing Improvements
1
2
Project Area (ac)
30.2
3
Coastal Wetland Area (ac)
0
4
Surface Water Area (ac)
0
5
Is this pr9ject High or Low Density?
Low
6
1 Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003 4
7
Width of vegetated setbacks provided (feet)
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 thisproject?
No
NUMBER
AND TYPE OF SCMS:
11
Infiltration System
12
Bioretention Cell
_
13
Wet Pond
14
Stormwater 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
Name and Title:
Garrett Frank, PE, PLA
Organization:
Timmons Group
Street address:
5410 Trinity Road, Suite 102
City, State, Zip:
Phone numbers :
Email:
Raleigh, NC, 27607
919-866-4503 ]
[e-mail]
Certification Statement:
I certify, under penalty of law that this Supplement-FZ 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, We, 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
,j11411111111110,"'
Aaaaa C A ry��rx
• . .ss'Q �i
,i
►��, '�,,•' t'•
�QF � �/
SEAL 9�=�
055780
., ;A� E.N.............
Of
Sr Z6 z _
Date

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
(DRAINAGE
AREA INFORMATION
Entire Site
LD 1
4
Type of SCM
Vegetated Swale
Vegetated Swale
5
Total drainage area (sq ft)
1,315,512
1,315,512
6
Onsite drainage area sq ft
1,315.512
1.315,512
7
Offsite drainage area (sq ft)
0
0
8
9
Total BUA in project (sq ft)
New BUA on subdivided lots (subject to permitting)
(sq ft)
251486 sf
251486 sf
N/A
N/A
10
New BUA not on subdivided lots (subject to
permittinsf)79583
_ _
sf
79583 sf
11
Offsite BUA (sq ft)
Breakdown of new BUA not on subdivided lots:
- Parkin sq ft
Sidewalk (sq ft)
N/A
N/A
12
32946 sf
32946 sf
3444 sf
3444 sf
- Roof ft
sf
sf
Roadway (sq ft)
43193 sf
43193 sf
Future ft
N/A
N/A
Other, please specify in the comment box
below (sq ft
N/A
N/A
13
New infiltrating permeable pavement on
subdivided lots (sq ft)
N/A
N/A
14
New infiltrating permeable pavement not on
subdivided lots sq ft)
N/A
N/A
15
Existing BUA that will remain (not subject to
ermittin2) (sq ft
171903 sf
171903 sf
16
Existing BUA that is already permitted (sq ft)
sf
sf
17
Existing BUA that will be removed (sq ft)
13293 sf
13293 sf
18
Percent BUA
19%
19%
19
Desi n storm inches
1.0 in
1.0 in
20
1 Design volume of SCM (cu f1)
N/A
N/A
21
1 Calculation method for design volume
NIA
N/A
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage areas :

LOW DENSITY
g2lGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H 1003
1
Is project below density thresholds set forth in the applicable stormwater rule?
Yes _
Yes
2
Does project maximize dispersed flow and minimize channelization of flow?
3
Has the use ofpipinq been minimized per .1003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances H:V
3:1
5
Maximum velocity in the vegetated conveyances duri2Q the 10- ear storm?
3.37
6
I.Are curb outlet swales.pro osed?
Yes
7
Maximum longitudinal slope of curb outlet swale(s) (%)
4.1
8
Bottom width of curb outlet swale s (feet)
2 it
9
Maximum side slope of curb outlet swale s) (H:V)
3:1
10
Minimum length of curb outlet Swale(s)( feet
122.0 ft
11
Are treatment swales used instead of curb outlet swales?
No
12
Is stormwater released at the edge of the setback as dispersed flow?
Yes
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
Are variatl s to rule .1003 ro osed?
No
,ADDITIONAL INFORMATION
15
Please use this s ace to rovide an additional information about this low densit ro'ect:
The curb outlet swales are: PDD2, PDD3 & PDD8
SwaleBUA
#
Drainage)
�a (ae)
Pervious
rea
ac)
C
Q
(efs)
Slope
N
V.11-
(fps)
V.-i
(fps)
Flow depth
(ft)
1
0.31
0.10
0.21
0.54
1.18
3.22
4.50
2.73
0.35
2
1.64
0.63
1.01
0.58
6.73
3.20
4.50
3.37
0.40
3
0.18
0.12
0.06
0.76
0.98
3.10
4.50
1.90
0.20
4
0.65
0.30
0.35
0.63
2.88
3.71
4.50
2.96
1 0.35
5
0.49
0.09
0.40
0.46
1.59
3.15
4.50
2.74
0.35
6
3.71
1.25
2.45
0.55
14.50
1.00
4.50
3.19
1.10
7
0.23
0.04
0.19
0.45
0.74
4.70
4.50
2.93
0.30
8
0.64
0.31
0.33
0.64
2.80
4.10
4.50
3.71
0.30
9
10
11
12
13
14
15
16
17
- -
18
19
--
20
_
21
22
23
_
24
25
26
27
28
29
30