SWA000208_Supplement-EZ Form_20230525

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 lProiectName
4 (Surface Water Area
THE PLANT GUYS
5 Ils this project High or Low Density? Both High and Low Density
6 1 Does this proiect use an off -site SCM? No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
10
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
0
12
Bioretention Cell
0
13
Wet Pond
0
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
1
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
0
22
1 Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Bayfilter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Brian T. Upton, P.E. Project Engineer)
28
Organization:
The Isaacs Group, P.C.
29
Street address:
8720 Red Oak Blvd, Suite 420
30
City, State, Zip:
Charlotte, NC 28217
31
Phone numbers :
704 227-9406
32
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.
Signature of Designer
Seal
Date

DRAINAGE AREAS
1
Is this a hi h density project?
Yes
2
If so, number of drainage areas/SCMs
1
3
Does this project have low density areas?
Yes
4
If so number of low density drainage areas
3
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
LID 1
LID 2
LID 3
4
Type of SCM
N/A
Sand Filter
N/A
N/A
N/A
5
Total drainage area (sq ft
360,239
104108
10,890
8,276
28,749
6
Onsite drainage area (sq ft
360,239
104108
10,890
8,276
28,749
7
Offsite drainage area (sq ft
0
0
0
0
0
8
Total BUA in project (sq ft
192791 sf
58370 sf
sf
1670 sf
16011 sf
9
New BUA on subdivided lots (subject to
ermitting) (sq ft
10
New BUA not on subdivided lots (subject to
ermittin s
11
Offsite BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
- Sidewalk (sq ft
- Roof (sq ft
- Roadway s ft
- Future (sq ft
- Other, please specify in the comment box
below (sq ft)
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on
Isubdivided lots (sq ft
15permitting)
Existing BUA that will remain (not subject to
s ft
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
18
Percent BUA
54%
56%
0%
20%
56%
19
Design storm inches
4.8 in
20
IDesign volume of SCM cu ft
41643 cf
21
lCalculation method for design volume
Rational
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
Is project below density thresholds set forth in the applicable stormwater rule?
Yes
1
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)
3:1
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
2.65 fUs
6
lAre 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?
No
12
Ils stormwater released at the edge of the setback as dispersed flow?
Yes
13
1 Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
JAre variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15
Please use this space to provide any additional information about this low density project:
There are 3 areas that drain offsite without going through the Sand Filter basin. Those areas are grassed, to the highest extent
possible, and/or they are *below* the elevation of the Sand Filter and cannot be treated by that basin. The areas are shown an
labeled on the Drainage Area Maps Sheet C6.0 in the full-sized Ian set).

SAND FILTER
18
SHWT elevation (fmsl)
700
19
Type of sand filter (open or closed)
Open
20
If closed, will the filter will be pre -cast or pour -in -place?
21
If closed, top of grate elevation (fmsl)
22
Is this sand filter designed to attenuate peak flows?
Yes
Sediment Chamber
23
Volume that can be retained in the sediment chamber (cubic feet) 1,240 cu ft
Will there be a permanent pool in the sediment chamber? No
Bottom of the sediment chamber (fmsl) 712.00'
Area of the sediment chamber (square feet) 930 sq ft
24
25
26
27
Physical depth of the sediment chamber (inches)
36 in
28
Ponding depth in the sediment chamber, above any permanent
pool (inches)
24 in
291
Elevation of top of weir between chambers (fmsl)
714.00'
I Sand Chamber
30 Volume that can be retained in the sand chamber (cubic feet) 10,000 cu ft
31
Bottom of the sand chamber (fmsl) 712.00'
32
Area of the sand chamber (square feet) 4,872 sq ft
33
Physical depth of the sand chamber (inches)
54 in
34
Ponding depth in the sand chamber, above the sand surface
inches
25 in
351
Elevation of the bypass device (fmsl)
714.10'
36
Type of bypass device
Weir
37
Mechanism for distributing flow over the sand surface
Sheet Flow
38
Sand specification for sand chamber
ASTM C33
39
Depth above underdrain pipe (inches)
30 in
40
Will the media be maintained to drain at least two inches per hour at
the sand surface?
Yes
41
Is at least one clean -out pipe provided at the low point of each
underdrain line?
Yes
42
Will clean -out pipes be capped?
Yes
INFORMATION
I 431 Please use this space to provide any additional information about thel
sand filter(s):
Sand Filter 1 12:13 PM 1/26/2023