SW5220103_Supplement-EZ Form_20220124

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 lProiect Name
Project Area (ac)
Coastal Wetland Area (ac)
Surface Water Area (ac)
Is this project High or Low Density?
Does this project use an off -site SCM?
Wave Wash Louisbu
1.011
0
0
High
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
5
8
Will the vegetated setback remain vegetated?
Yes
9
Ilf BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
Yes
10
1 Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration S stem
1
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
JBayfilter
26
1 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Jarrett Senkbeil / President
28
Or anization:
OnSite Civil Group
29
Street address:
980 Birmingham Rd
30
City, State, Zip:
Milton, GA 30004
31
Phone numbers :
404-822-9147
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.
22gLgner
CAR
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0035943
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Seal
Signature of Designer
Date
' I I
1-18-22

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
1.01
3
Does this roiect have low densit areas?
No
4
If so, number of low density drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
AREA INFORMATION
Entire Site
1
4
T pe of SCM
Infiltration System
Infiltration System
5
Total drainage area (sq ft
43996
43996
6
Onsite drainage area (sq ft
43996
43996
7
Offsite drainage area (sq ft
0
0
8
Total BUA in project (sq ft
32234 sf
32234 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
0 sf
0 sf
10permitting)
New BUA not on subdivided lots (subject to
s
32234 sf
32234 sf
11
Offsite BUA (sq ft
0 sf
0 sf
12
1 Breakdown of new BUA not on subdivided lots:
0
0
Parking (sq ft
10980 sf
10980 sf
Sidewalk (sq ft
780 sf
780 sf
Roof (sq ft
3500 sf
3500 sf
Roadway s ft
16974 sf
16974 sf
Future (sq ft
0 sf
0 sf
Other, please specify in the comment box
below (sq ft
0 sf
0 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
0 sf
0 sf
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
0 sf
0 sf
15
Existing BUA that will remain (not subject to
ermitting) (sq ft
0 sf
0 sf
16
Existing BUA that is already permitted (sq ft
0 sf
0 sf
17
Existing BUA that will be removed (sq ft
18
Percent BUA
74%
74 0
19
Design storm inches
1.5 in
1.5 in
20
Design volume of SCM cu ft
14850 cf
14850 cf
21
Calculation method for design volume
Chambers
Chambers
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
The offsite area bypasses the infiltration system.

INFILTRATION SYSTEM
1 Drainage area number 1
2 1 Minimum required treatment volume (cu ft) 3106 cf
GFNFRAI mnr FRnm n9H insn
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
4
Is the SCM located away from contaminated soils?
Yes
5
What are the side slopes of the SCM (H:V or enter "Vertical' for
trenches)?
na
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes?
No
7
Are the inlets, outlets, and receiving stream protected from erosion
10- ear storm)?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
9
lWhat is the method for dewatering the SCM for maintenance?
Other
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 the drainage easement comply with General MDC (9)?
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC 10 ?
N/A
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
16
Does the SCM follow the device specific MDC?
Yes
17
Was the SCM designed by an NC licensedprofessional?
Yes
18 1 Proposed slope of the subgrade surface (%) 0%
19 jAre terraces or baffles provided? No
20 1Tvpe of pretreatment: Upstream SCM
Data
21
Was the soil investigated in the footprint and at the elevation of the
infiltrations stem?
Yes
22
SHWT elevation (fmsl)
na
23
Depth to SHWT per soils report (in)
96"
24
Ground elevation at boring in soils report (fmsl)
264.00
25
Is a detailed hydrogeologic study attached if the separation is
between 1 and 2 feet?
Yes
26
ISoil infiltration rate (in/hr)
5.96
27
1 Factor of safety (FS) (2 is recommended):
11.92
(Elevations
29
113ottom elevation (fmsl)
258 ft
30
IStorage elevation (fmsl)
260. ft
31
1 Bypass elevation (fmsl)
265 ft
Basins
32 1 Bottom surface area(ft) 3152 ft
33 Istorage elevation surface area(ft) 3152. ft
For Trenches Only
34
Length (ft)
na
35
Width (ft)
na
36
Perforated pipe diameter, if applicable (inches)
na
37
Number of laterals
na
38
Total length of perforated piping
na
39
Stone type, if applicable
na
40
Stone porosity (%)
40%
41
Is stone free of fines?
Yes
42
Is the stone wrapped in geotextile fabric?
Yes
43
Has at least one inspection port been provided?
Yes
vo/umesiurawaown
44 IDesign volume of SCM (cu ft) 3106 cf
45 ITime to draw down (hours) 20 hrs
I 46 Please use this space to provide any additional information about I
the infiltration system(s):
at 1-1=1.23 in/hour. At 24" depth / 1.23 in/hour = 19.5 in/hr or 20 hrs.
Infiltration 3 9:12 AM 1/18/2022