SW3210801_Supplement-EZ Form_20211124

SUPPLEMENT-EZ COVER PAGE
LOAD SUPPLEMENT FORMS
PROJECT INFORMATION
1
Project Name
1-85 Commerce Center
2
Project Area ac
41.87
3
Coastal Wetland Area ac
0
4
Surface Water Area ac
0
5
Is this project High or Low Density?
High
6
1 Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
N/A
8
Will the vegetated setback remain vegetated?
N/A
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
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
1 Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Ba filter
0
26
Filterra
0
LOAD SUPPLEMENT FORMS
DESIGNER CERTIFICATION
27
Name and Title:
Brad Smith
28
Organization:
Thomas & Hutton
29
Street address:
1020 Euclid Avenue
30
City, State, Zip:
Charlotte, NC 28203
31
Phone numbers :
980-201-55-12
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.
THOMAS
SEAL 3 HUTTON
48704 = _ ENGINEERING
CO.
11-Z3--2 l:F� . No. F-0871
F/yG I NEER . c `��• 'i��� i�9' •........ • •''o��� ``Q�414111111111100
Signature of Designer
Date
I I --Z3 -- 2 l

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
1
3
Does this project have low density 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
DRAINAGE AREA INFORMATION
Entire Site
4
Tvoe of SCM
5
Total drainage area (sq ft
1,823,857
6
Onsite drainage area (sq ft
1,823,857
7
Offsite drainage area (sq ft
0
8
Total BUA in project (sq ft
1282035 sf
9(so
New BUA on subdivided lots (subject to permitting)
ft
sf
10permitting)
New BUA not on subdivided lots (subject to
s
1282035 sf
sf
11
Offsite BUA (sq ft
12
113reakdown of new BUA not on subdivided lots:
- Parking (sq ft
-Sidewalk (sft
0
507134 sf
6955 sf
- Roof (sq ft
676600 sf
- Roadway s ft
73425 sf
- Future (sq ft
sf
- Other, please specify in the comment box
below (sq ft
17921 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
sf
15permitting)
Existing BUA that will remain (not subject to
s ft
sf
16
Existing BUA that is already permitted (sq ft
sf
17
Existing BUA that will be removed (sq ft
sf
18
Percent BUA
70%
19
Design storm inches
20
Design volume of SCM cu ft
21 Calculation method for design volume
DDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
The area in the 'other" section is for curb and gutter (17,921 so. There is
14,817 sf of offsite area draining to the proposed wet pond. We will assume
that the entire area will be impervious area to be conservative.
Wet Pond 1, 2, 3,
&4
1,708,410
1,693,593
14,817
1296852 sf
sf
1282035 sf
14817 sf
0
507134 sf
6955 sf
676600 sf
73425 sf
sf
17921 sf
sf
sf
sf
sf
sf
76%
1.0 in
104471 cf
Averaae

WET POND
71 Drainage area number
31
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
3:1
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No
No
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion
10- ear storm)?
Yes
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
desi n volume?
No
No
No
No
9
What is the method for dewatering the SCM for maintenance?
Pump (preferred)
Pump (preferred)
Pump (preferred)
Pump (preferred)
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
Yes
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC 10 ?
N/A
N/A
N/A
N/A
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
Yes
Yes
161
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
Yes
171
Was the SCM designed by an NC licensedprofessional?
Yes
Yes
Yes
Yes
WFT Pr]Nn
Mnr FRnM n9H An53
18
Sizing method used
SA/DA
SA/DA
SA/DA
SA/DA
19
Has a stage/storage table been provided in the calculations?
Yes
Yes
Yes
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl
758.50
755.50
755.50
758.50
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
759.00
756.00
756.00
759.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
763.50
763.50
763.50
763.50
23
Elevation of the permanent pool (fmsl)
764.00
764.00
764.00
764.00
24
Elevation of the top of the vegetated shelf (fmsl)
764.50
764.50
764.50
764.50
25
Elevation of the temporary pool (fmsl)
765.49
765.49
765.49
765.49
26
Surface area of the main permanent pool (square feet)
34057
8618
27
Volume of the main permanent pool (cubic feet)
cf
167179 cf
40189 cf
cf
28
Average depth of the main pool (feet)
5.45 ft
5.45 ft
5.45 ft
5.45 ft
29
Average depth equation used
Equation 3
Equation 3
Equation 3
Equation 3
30
If using equation 3, main pool perimeter (feet)
Oft
1297.0 ft
381.0 ft
Oft
31
If using equation 3, width of submerged veg. shelf (feet)
3.0 ft
3.0 ft
3.0 ft
3.0 ft
32
Volume of the forebay (cubic feet)
7379 cf
cf
cf
31115 cf
33
Is this 15-20% of the volume in the main pool?
Yes
Yes
Yes
Yes
34
Clean -out depth for forebay (inches)
54 in
N/A
N/A
54 in
35
Design volume of SCM (cu ft)
7253 cf
62191 cf
16122 cf
23433 cf
361
Is the outlet an orifice or a weir?
Orifice
Orifice
Orifice
Orifice
37
If orifice, orifice diameter (inches)
N/A
5 in
N/A
N/A
38
If weir, weir height (inches)
39
If weir, weir length (inches)
-
-
-
-
40
Drawdown time for the temporary pool (days)
2.1
2.1
2.1
2.1
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
Yes
Yes
Yes
42
Are berms or baffles provided to improve the flow path?
No
No
No
No
43
Depth of forebay at entrance (inches)
66 in
N/A
N/A
66 in
44
Depth of forebay at exit (inches)
60 in
N/A
N/A
60 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
Yes
Yes
Yes
46
Width of the vegetated shelf (feet)
6 ft
6 ft
6 ft
6 ft
47
Slope of vegetated shelf (H:V)
6:1
6:1
6:1
6:1
48
Does the orifice drawdown from below the top surface of the
ermanent pooI?
Yes
Yes
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
r, 24-hr storm?
Yes
Yes
Yes
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC 9 is met.
No
No
No
No
51
Is a trash rack or other device provided to protect the outlet system?
Yes
Yes
Yes
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
Yes
Yes
Yes
53
Species of turf that will be used on the dam and embankment
Bermuda
Bermuda
Bermuda
Bermuda
54
Hasa planting plan been provided for the vegetated shelf?
No
No
No
No
11TIONAL INFORMATION
55 Please use this space to provide any additional information about the
wet oond(s):
2