SW3210401_Supplement-EZ Form_20210415

SUPPLEMENT-EZ COVER PAGE
FanMSI. PEI-
.......................................................................................................................................................................................................................................................................................................................................................................
PROJECT INFORMATION
1 Project Name
Caliber Collision Outparcel
2 Project Area (ac)
27.5
3 Coastal Wetland Area (ac)
0
4 Surface Water Area (ac)
0.11 E
5 Is this project High or Low Density?
High
6 Does this project use an off -site SCM?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System 0
12
Bioretention Cell 0
13
Wet Pond 1.
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 0
22
Dry Pond 0
23
StormFilter 0
24
Silva Cell 0
25
Bayfilter 0
26
Filterra 0
Iffliflim'18011041C
DESIGNER CERTIFICATION
27
Name and Title:
Marc Momsen, P.E.
28
Organization:
Land Design
29
Street address:
223 North Graham Street
30
City, State, Zip:
Charlotte, NC 28202
31
Phone number(s):
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.
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Digitally Signed by MARC MOMSEN
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MARC MOMSEN E-MMGMSE DESIGN.coM,
4/ 6/ 2 0 21 O-LANDDESIGNIGN, CN CN MARC
MOMSEN
R aso I have rev ewed this document
Date:2921.04.06 15:32:22 04'00'
Date

DRAINAGE AREAS
I Is this a high density projects Yes
If so, number of drainage
Is all/part of this project subject to previous rule
versions? No
I FORIVISLOADED
DRAINAGEAREA INFORMATION...................................................................................................................... ......................................... ......................................Entire
..............Site ....................................
....................................................................... 1 ....................................................................
4
Type of SCM
5
Total P!ZiA in pEqj!��! (sq
662112 sf
77972 sf
New BUA on subdivided lots (subject to permitting)
New BUA outside of subdivided lots (subject to
7
permitting) (so
584140 sf
77972 sf
§
Offsiie : total area (sq !D
NA
NA
9
Offsite BUA (sq ft)
N/A
N/A
19
Breakdown of new BUA outside subdivided lots:
Parking (N ft)
41050 sf
Sidewalk (sq 1)
1320 sf
Rog! (sq 1)
29860 s!
Roadway (sq 1)
14712 s!
Futures T 1584140
sf
Other, please specify in the comment box
below (sq 1)
New infiltrating permeable pavement on
11
subdivided lots (sq ft)
New infiltrating permeable pavement outside of
12
subdivided lots (sq ft)
NA
Exisitng BUA that will remain (not subject to
13
permitting) (sq 1)
147§1 s!
14
Existing BUA that is already permitted (sq ft)
15
Existing BUA that will be removed (sq ft)
3894 s!
16
Percent BUA
80%
9%
17
Design storm (inches)
1 in
1 in
18
Design volume of SCM
19
Calculation method for design volume
�
NRCS Method
NRCS Method
IN
NFORMATION
FORMATION
Please use this space to provide any additional information about the
20
...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
drainage area(s):

WET POND
1
Drainage area number
1
2
Design volume of SCM (cu ft)
.. 53107 cf
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
NG
4
Is the SCM located away from contaminated soils?
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
Does the SCM have retaining walls, gabion walls or other engineered
6
side slopes?
No
Are the inlets, outlets, and receiving stream protected from erosion
7
(10-year storm)?
Yes
Is there an overflow or bypass for inflow volume in excess of the
8
design volume?
No
9
What is the method for dewatering the SCM for maintenance?
Pump (prefer
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
If the SCM is on a single family lot, does (will?) the plat comply with
13
General MDC (10)?
No
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
i5l
Is there an O&M Plan that complies with General MDC (12)?
Yes
an
18 Method used
SA/DA
19 Has a stage/storage table been provided in the calculations?
Yes
Elevation of the excavated main pool depth (bottom of sediment
20 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
23 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)
554.00
26 Surface area of the main permanent pool (square feet)
17499 sf
27 Volume of the main permanent pool (cubic feet)
85688 cf
28 Average depth of the main pool (feet)
4.90 ft
IT using equation 3, main pool perimeter �teet/
If using equation 3, width of submerged veg. shelf (feet)
Volume of the forebay (cubic feet)
12798 cf
Is this 15-20% of the volume in the main pool?
Yes
Clean -out depth for forebay (inches)
12 in
Design volume of SCM (cu ft)
53107 cf
Is the outlet an orifice or a weir?
Orifice
40 Drawdown time for the temporary pool (days)
2.15
Are the inlet(s) and outlet located in a manner that avoids short-
41 circuiting?
Yes
42 Are berms or baffles provided to improve the flow path?
Yes
43 Depth of forebay at entrance (inches)
102 in
44 Depth of forebay at exit (inches)
114 in
45 Does water flow out of the forebay in a non -erosive manner?
Yes
46 Width of the vegetated shelf (feet)
6 ft
Does the orifice drawdown from below the top surface of the
48
permanent pool?
Yes
Does the pond minimize impacts to the receiving channel from the 1-
49
yr, 24-hr storm?
Yes
Are fountains proposed? (If Y, please provide documentation that
50
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
54
Has a planting plan been provided for the vegetated shelf?
No
ADDITIONAL
INFORMATION
Please use tnls s ace to rovide an additional information about the
p p Y
55
wet pond(s):
Wet Pond 3 11:13 AM 4/6/2021