SW4210702_Supplement-EZ Form_20210729

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Project Name
Sauthem Alamar a High School Additions and Renovations
2
Project Area ac
89.5
0 m
3
Coastal Wetland Area ac
4
Surface Water Area ac
0
5
Is this P ro ect H ig h or Low Dens ?
Hi
fi
Roes this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
NIA _
8
Will the vegetated setback remain vegetated?
NIA
9
If BUA is proposed in the setback, does it meet NCAC 02H.I003 4 o-d ?
N/A
10
Is streambank stabilization proposed on this project?
J No
NUMBER AND TYPE OFSCMs:
11
infiltration System
12
Bioretention Cell
13
Wet Pond
1
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting RWH
_
18
Green Roof
19
Level S p reader -Filter Stri LS-FS
20
Disconnected Impervious Surface (DIS)_
21
Treatment Swale
22
Dry Pond
23
StormFilter
24
Silva Cell
25
Bayfilter
_
_
26
Filterra
FORMSLOADEQ
DESIGNER CERTIFICATION
27
Name and Title:
L. Allan Hill, PEJPrinci aI
28
Organization:
_ Triad Design Group, PC
29
Street address:
City, State, Zip:
�T _4807-C "er. Boulevard_
Gre_ensbora, NC 27407
30
31
Phone numbers :
336-218-8282
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.
,�\A C,4r901
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SEAL F
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Signature of Designer
7 y has/
Date

DRAINAGE AREAS
f
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
1
3
❑aes this pLoject. have low de ns ity areas?
NO
4
If so, number of low densit
y drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
4
Type of SCM
Wet Pond
Wet Pond
5
Total drainage area (sq ft
3898620
Z73992
6
Onsite drainage area (sq ft
3898520
273992
7
Offsite drainage area (sq ft
0
0
8
Total BUA in project (sq ft
1042609 sf
169884 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
122055 sf
131966 sf
10permitting)
New BUA not on subdivided lots (subject to
s
sf
sf
11
Offsite BUA (sq ft
sf
sf
12
1 Breakdown of new BUA not on subdivided lots:
- Parkin (sq ft
sf
sf
Sidewalk ft
sf
sf
- Roof (sq ft
sf
sf
- Roadway s 1t
sf
sf
- Future ft
sf
sf
- Other, please specify in the comment box
below (sq ft
sf
sf
13
New infiltrating permeable pavement on
Isubdivided lots (sq ft
sf
sf
14
New infiltrating permeable pavement not on
subdivided lots 1t
sf
sf
15permitting)
Existing BUA that will remain (not subject to
s ft
37918 sf
37918 sf
16
Existing BUA that is already permitted (sq ft
sf
sf
17
Existing BUA that will be removed (sq ft
205298 sf
82534 sf
18
Percent BUA
27%
62°%
19
Design storm inches
.0 in
1.0 In
20
Design volume of SCM cu ft
cf
13883 cf
21
Calculation method for design volume
of
SAIDA
ADDITIONAL INFORMATION
22
_
Please use this space to provide any additional information about the
drainage area(s):

WET POND
1
Drains a area number j 1
2
1 Minimum required treatment volume cu tt 13883 cf
GENERAL: MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
No
4
Is the SCM located away from contaminated sails?
Yes
5
What are the side slopes of the SCM (H: ?
:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
Nc
7
Are the inlets, outlets, and receiving stream protected from erosion
t 0 ear 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?
Drawdown Orifice
10
If applicable, wilt the SCM be cleaned out after construction?
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
12
Does the d rai nag a easement comply with General MDC 9 ?
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General M DC 10 ?
NIA
i4
Is there an O&M Agreement that complies with General MDC (11)?
Yes
15
Is there an O&M Pie that complies with General MDC 12)?
Yes
16
Does the SCM follow the devicespecific MDC?
Yes
17
Was the SCM designed by an NO licensed professlonaI?
I Yes
WET POND MDC FROM 02H .3053
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
599.00
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
600.DO
221
Elevation of the bottom of the vegetated shelf (fmsl)
603.50
231
Elevation of the permanent pool fmsl
604.00
24
Elevation of the top of the vegetated shelf fmsl
604.50
25
Elevation of the temporary pool fmsl)
605.50
26
Surface area of the main permanent pool (square feet)
8172
27
Volume of the main permanent pool cubic feet)
22533 cf
28
Average depth of the main pool feet
3.46 It.
29
Average depth equation used
Equation 3�
30
If using equation 3, main poolperimeter (feet)
31
If using equation 3, width of submerged . shelf feet
32
Volume of the forebay (cubic feet
33
Is this 15-20% of the volume in the main pool?
34
Clean -out depth for fore bay inches
35
Design volume of SCM (cu ft
36
Is the outlet an orifice or a weir?
Orifice
37
If orifice, orifice diameter (inches)
2 in
38
if weir, weir height inches
39
If weir, weir length inches
40
Drewdown time for the tempora ry pool (days)
41
Are the inlets] and outlet located in a manner that avoids short-
circuitin ?
42 1
Are berms or baffles providad to improve the flowpath?
43
Depth of forebay at entrance (inches)
4d
Depth of forebay at exit [inches
45
Does water flow out of the forebay in a non -erosive manner?
46
Width of the vegetated shelf (feet)
47
Slope of vegetated shelf (H:
48
Does the orifice drawdown from below the top surface of the
permanent ool.
49
Does the pond minimize impacts to the receiving channel from the 1-
yr. 24-hr storm?
50
Are fountains proposed? (If Y, please provide documentation that
MDC 9 is met.
51
Is a trash rack or other device provided to protect the outlet system?
52
Are the dam and embankment planted in non -clumping turf grass?
53
Species of turf that will be used on the dam and embankment
541
Hasa planting plan been g2vided for the vegetated shelf?
ADDITIONAL
INFORMATION
T
55
Please use this space to provide any additional information about th
wet ponds):
et Pond
10:20 AM 7/28/2021

WET POND
Wet Pond 2 16:26 AM 7/28/2021