SW3200202_Supplement-EZ Form_20220216

SUPPLEMENT-EZ COVER PAGE
PROJECT INFORMATION
1 JProjectName
Subdivision Phases 11-14
86.84
2.56
5 Ils 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
30
8
IWII the vegetated setback remain vegetated?
Yes
Yes
9 lif BUA is proposed in the setback, does it meet NCAC 021-1.1003 4 c-d ?
10
Is streambank stabilization proposed on this ro'ect?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
0
13
Wet Pond
1
14
1 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 Im ervious Surface (DIS)
0
21
Treatment Swale
0
22
D 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 Van Dine, PLS, PE
28
Organization:
McAdams
29
Street address:
3430 Torin don Way, Suite 110
30
Ci State Zip:
Charlotte NC 28277
31
Phone numbers :
Email:
704-527-0800
32
[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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DRAINAGE AREAS
1 'Is this a hig density ro act?
Yes
2
If so number of drainage areas/SCMs
1
3
Does this 2roject have low density areas?
Yes
4
If so number of low density drainage areas
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
i
LD 1
4
Type of SCM
N/A
Wet Pond
Bypass Area
5
Total drainage area (sq ft
2552616
1591284
961332
6
Onsite drainage area (sq ft
2552616
1591284
961332
7
Offsite drainage area (sq ft)
Total BUA in ro'ect (sq ft
0
0
0
8
810660 sf
779083 sf
31577 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
545920 sf
530360 sf
15560 sf
10permitting)
New BUA not on subdivided lots (subject to
s
264740 sf
248723 sf
16017 sf
11
Offsite BUA (sq ft
sf
sf
sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
14080 sf
14080 sf
sf
Sidewalk (sq ft
71408 sf
65708 sf
5700 sf
- Roofs ft
sf
sf
sf
Roadway_(sg ft
179252 sf
168935 sf
10317 sf
Future (pq.t,.
sf
sf _
sf
Other, please specify in the comment box
below Lsg ft)
sf
sf
sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
New infiltrating permeable pavement not on
subdivided lots (sq ft
N/A
N/A
N/A
14
N/A
N/A
N/A
15permitting)
Existing BUA that will remain (not subject to
s ft
N/A
N/A
N/A
16
Existing BUA that is already permitted (sq ft
N/A
N/A
N/A
17
Existing BUA that will be removed (scL
N/A
N/A
N/A
18
Percent BUA
32%
49%
3%
19
Design storm #nchgs
NIA
1.0.in
N/A
20
10asign volume of SCM cu ft
N/A
65062 cf
N/A
21
lCalculation method for desi n volume
N/A
SA/DA
N/A
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

WET POND
1
Drainage area number
1
2
Minimum required treatment volume cu ft
65062 cf
Is.the SCM sized to treat the SW from all surfaces at build out?
No
_3
4
Is the SCM located awa from contaminated soils?
Yes
5
What are the side slopes of the SCM H: ?
3:1
6
Does the SCM have retaining walls, gabion walls or other
side slopes?
No
_engineered
70-
Are the inlets, outlets, and receiving stream protected from erosion
1ear storm ?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
9
What is the method for dewatering the SCM for maintenance?
Pum referred
10
If applicable, will the SCM be cleaned out after construction?
Yes
11
Does the maintenance access cam I 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
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 devicespecific MDC?
Yes
17
Was the SGM designed Int an NC licensedprofessional?
Yes
ND
18
Sizing method used
SAIDA
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
591.00
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
592.00
22
Elevation of the bottom of the vegetated shelf fmsl
596.50
23
Elevation of the permanent pool fmsl
597.00
24
Elevation of the top of the vegetated shelf fmsl
597.50
25
Elevation of the temporary pool fmsl
598.04
26
Surface area of the main permanent pool s uare feet
44579
27
Volume of the main eermanent pool cubic feet
183133 cf
28
Average depth of the main pool feet
4.11 ft
E uation 2
29
Avera a depth euation used
30
If using a uation 3, main pool perimeter feet
N/A
31
If using equation 3, width of submerged veg. shelf feet
N/A
32
Volume of the foreba cubic feet
35650 cf
33
Is this 15-20% of the volume in the mainpool?
Yes
34
Clean -out depth for forebay Cinches)46
in
35
Design volume of SCM Lou ft
66482 cf
36
Is the outlet an orifice or a weir?
Orifice
37
If orifice orifice diameter inches
4.5 in
381
If weir, weir height inches
N/A
39
If weir, weir length inches
N/A
40
Drawdown time for the temporary pool (days)
2.95
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 flowpath?
No
43
Depth of forebay at entrance inches
60 in
44
Depth of forebay at exit inches
54 in
451
Does water flow out of the forebay in a non -erosive manner?
Yes
46
Width of the vegetated shelf feet
loft
47
Slope of vegetated shelf H:
10:1
48
Does the orifice drawdown from below the top surface of the
permanentpool?
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
r, 24-hr storm?
Yes
50
Are fountains proposed? Of 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
Tall Fescue
54
Has a planting plan been pirovided for the vegeWed shelf?
Yes
ADDITIONAL
INFORMATION
55
Please use this space to provide any additional information about
the wet pond(s):
Wet Pond 1 3:08 PM 2/7/2022