SW3210401_Supplement-EZ Form_20210810

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 1 Project Name
I Providence Commons - Caliber Collision
3 JCoastal Wetland Area (ac) 0
4 1 Surface Water Area (ac) 0.0527
1 6 1 Does this project use an off -site SCM? I No
MPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
50
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1003(4)(c-d) out of the setback?
Yes
10
Is streambank stabilization proposed on this project?
No
MBER AND TYPE OF SCM
11
Infiltration System
0
12
Bioretention Cell
0
13
Wet Pond
1
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
ISand 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
0
22
Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Ba filter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Marc Momsen, P.E.
28
Organization:
LandDesi n
29
Street address:
223 North Graham Street
30
City, State, Zip:
Charlotte, NC 28202
31
Phone numbers :
704-333-0325
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.
SEAL
033804
�✓q' FNciNEE�.,�
C D.
Signature .: si ;ner
Date
09 Aug 2021

DRAINAGE AREAS
1
Is this a high densityproject?
Yes
2
If so, number of drainage areas/SCMs
1
3
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
4
Type of SCM
5
Total BUA in project (sq ft
374984 sf
469403 sf
6
New BUA on subdivided lots (subject to permitting)
(sq ft
7
New BUA outside of subdivided lots (subject to
permitting) (so
360094 sf
360094 sf
8
Offsite - total area (sq ft
N/A
94419 sf
9
Offsite BUA (sq ft
N/A
94419 sf
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
41080 sf
41080 sf
Sidewalk (sq ft)
1320 sf
1320 sf
Roof (sq ft
20860 sf
20860 sf
Roadway s ft
14712 sf
14712 sf
Future (sq ft
282122 sf
282122 sf
Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots (sq ft
N/A
12
New infiltrating permeable pavement outside of
isubdivided lots (sq ft
N/A
13permitting)
Exisitng BUA that will remain (not subject to
s ft
14890 sf
14890 sf
14
Existing BUA that is already permitted (sq ft
15
Existing BUA that will be removed (sq ft
323 sf
323 sf
16
Percent BUA
31%
60%
17
Design storm inches
1 in
18
Design volume of SCM cu ft
38465 cf
19
1 Calculation method for design volume
Simple Method
DITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):

WET POND
1 Drainage area number 1
2 Design volume of SCM (cu ft) 38465 cf
ERAL MDC FROM 02H .1050
31 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)?
3:1
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-year storm)?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
91
What is the method for dewatering the SCM for maintenance?
Pump (preferred)
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)?
No
141
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 licensed professional?
ET POND MDC FROM 02H .1053
181 Method used
Yes
SA/DA
19
Has a stage/storage table been provided in the calculations?
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl)
536.00
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
537.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
544.00
231
Elevation of the permanent pool (fmsl)
544.50
24
Elevation of the top of the vegetated shelf (fmsl)
545.00
25
Elevation of the temporary pool (fmsl)
546.28
26
Surface area of the main permanent pool (square feet)
13796 sf
27
Volume of the main permanent pool (cubic feet)
72878 cf
28
Average depth of the main pool (feet)
5.28 ft
29
Average depth equation used
Equation 2
301
If using equation 3, main pool perimeter (feet)
311
If using equation 3, width of submerged veg. shelf (feet)
32
Volume of the forebay (cubic feet)
12798 cf
33
Is this 15-20% of the volume in the main pool?
Yes
34
Clean -out depth for forebay (inches)
90 in
35
Design volume of SCM (cu ft)
38465 cf
36
Is the outlet an orifice or a weir?
Orifice
37
If orifice, orifice diameter (inches)
3.50 in
381
If weir, weir height (inches)
39
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
2.29
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
42
Are berms or baffles provided to improve the flow path?
No
43
Depth of forebay at entrance (inches)
102 in
441
Depth of forebay at exit (inches)
96 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
46
Width of the vegetated shelf (feet)
6 ft
47
Slope of vegetated shelf (H:V)
6:1
48
Does the orifice drawdown from below the top surface of the
permanent pool?
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 24-hr storm?
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC(9) is met.)
No
51
Is a trash rack or other device provided to protect the outlet system?
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
53
Species of turf that will be used on the dam and embankment
FACW Meadow Mix
541
Has a planting plan been provided for the vegetated shelf?
Yes
ADDITIONAL INFORMATION
55
Please use this space to provide any additional information about the
wet pond(s):
Wet Pond 3 4:46 PM 7/27/2021