20221135 Ver 2_SuppEZ Form_20230224

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
OJECT
INFORMATION
Project Name
Project Area (ac)
Coastal Wetland Area (ac)
Surface Water Area (ac)
1
TriWest Business Center
2
201.14
3
0
4
Low
5
Is this project High or Low Density?
6
Does this project use an off -site SCM?
No
H 02H .1003(4)
etated setbacks provided (feet)
30
etated setback remain vegetated?
71RUA
Yes
posed in the setback, does it meet NCACO2H.1003(4)(c-d)?
N/A
nk stabilization proposed on this project?
No
NUMBER D TYPE OF SCMs:
11
Infiltration System
12
Bioretention Cell
13
Wet Pond
2
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
Storm Filter
24
Silva Cell
25
Bayfilter
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Luke Bugenske, PE / Partner
28
Organization:
OAK Engineering, PLLC
29
Street address:
4929 Monroe Road
30
City, State, Zip:
Charlotte, NC 28205
31
Phone number(s):
803.312.5074
32
Email:
Juke@ oak. engineering
Certification Statement:
I certify, under penalty of lawthatthis 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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Signa re o De igner
Date
2/23/2023

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
2
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA I
4 Type of SCM
Entire Site
LD 1
Wet Pond
LD 2
Wet Pond
5
Total drainage area (sq ft)
862,052
664726
6
Onsite drainage area (sq ft)
862,052
664726
7
Offsite drainage area (sq ft)
0
0
8
Total BUA in project (sq ft)
639971 sf
479595 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft)
n/a
n/a
10
New BUA not on subdivided lots (subject to
permitting) (sf)
639971 sf
479595 sf
11
JOffsite BUA (sq ft)
n/a
n/a
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft)
73086 sf
181995 sf
Sidewalk (sq ft)
7013 sf
n/a
Roof (sq ft)
n/a
297600 sf
Roadway (sq ft)
55598 sf
n/a
Future (sq ft)
504971 sf
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
permitting) (sq ft)
n/a
n/a
16
Existing BUA that is already permitted (sq ft)
n/a
n/a
17
Existing BUA that will be removed (sq ft)
n/a
n/a
18
Percent BUA
74 %
72
19
Design storm (inches)
1.0 in
1.0 in
20
Design volume of SCM (cu ft)
51584 cf
38740 cf
21
Calculation method for design volume
Simple Method
Simple Method
ITIONAL
INFORMATION
122
Please use this space to provide any additional information about the
drainage area(s):

WET POND
11
Drainage area number
2
3
21
Minimum re uired treatment volume cu ft
51584 cf
38740 cf
GENERAL MDC FROM 02H .1050
31
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
31
31
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
No
No
9
What is the method for dewatering the SCM for maintenance?
Pump (preferred)
Pump (preferred)
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
Yes
13
f the SCM is on a single family lot, does (will?) the plat comply with
General MDC (10)?
Yes
Yes
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
161
Does the SCM follow the device specific MDC?
Yes
Yes
17
Was the SCM designed by an NC licensed professional?
Yes
Yes
WET POND
18
MDC FROM 02H .1053
Sizing method used SA/DA SA/DA
19
Has a stage/storage table been provided in the calculations?
Yes
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl)
704.50
697.50
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
705.00
698.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
710.00
701.00
23
Elevation of the permanent pool (fmsl)
710.50
701.50
24
Elevation of the top of the vegetated shelf (fmsl)
711.00
7002.00
25
Elevation of the temporary pool (fmsl)
712.72
702.50
26
Surface area of the main permanent pool (square feet)
20568
22118
27
Volume of the main permanent pool (cubic feet)
91040 cf
65775 cf
28
Average depth of the main pool (feet)
5.10 ft
3.36 ft
29
Average depth equation used
Equation 2
Equation 2
30
If using equation 3, main pool perimeter (feet)
31
If using equation 3, width of submerged veg. shelf (feet)
32
Volume of the forebay (cubic feet)
16814 cf
13068 cf
33
Is this 15-20 % of the volume in the main pool?
Yes
Yes
34
Clean -out depth for forebay (inches)
6 m
4 m
35
Design volume of SCM (cu ft)
114799 cf
168513 cf
36
Is the outlet an orifice or a weir?
Orifice
Orifice
37
If orifice, orifice diameter (inches)
5 in
5 in
38
If weir, weir height (inches)
39
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
2.3
2.5
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
Yes
42
Are berms or baffles provided to improve the flow path?
No
No
43
Depth of forebay at entrance (inches)
72 in
48 in
44
Depth of forebay at exit (inches)
66 in
42 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
Yes
46
Width of the vegetated shelf (feet)
6 ft
6 ft
47
Slope of vegetated shelf (H:V)
61
61
48
Does the orifice drawdown from below the top surface of the
permanent pool?
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 24-hr storm?
Yes
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC(9) is met.)
No
No
51
Is a trash rack or other device provided to protect the outlet system?
Yes
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
Yes
53
Species of turf that will be used on the dam and embankment
Bermuda
Bermuda
541
Hasa planting plan been provided for the ve etated shelf?
Yes
Yes
ADDITIONAL
INFORMATION
55
Please use this space to provide any additional information about the
wet pond(s):
Wet Pond 1 11:51 AM 2/23/2023