SW6200704_Supplement-EZ Form_20201125

SUPPLEMENT-EZ COVER PAGE
W QtBMS LOADED
FORMS LOADED
Cer0cation 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
wtlth the information provided here.
Designer -,III R I M $'
® 1 59
Signatu o De ne
Date

DRAINAGE AREAS
1 Isthis a high densd ro ect?
_2 If sonumber of drainage areas/SC Ms 2
vious rule
Is all/part of this project subject to pre
3 versions? No
FORIAS LOADED
uu
DRAINA iE AREAS INFORMATION
�o o��
Entlro l
1
4
xy e of SC6v8
5
dotal BL1A m project (sq ft)
48598461093
sf
T
New BUA on subdivided lots (subject to permitting)
......
6
(sq ....,,. �, �a n_, m
364000..24000
sf
New BUA outside of subdivided lots (subject to
..,.m.
7
' permitting) (sf)
121984 sf
3709 sf
8
Offsite total area (sq ft)
sf
sf
9
if site BUA..(sq ft) � e
sf
sf
10
Breakdown of new BUA outside subdivided lots:
m....
.... ,.
Parking (sq ft) .
Sidewalk
..
®..a.
, l gadvvay (sq ft) _ _
121984 sf.m.
.. .....
37093 sf
future (sq ft)
sf
sf
-Other, please specify m the comment box
............. ..�.
belo (sq f1)
sf
sf
nfiltrating permeable pavement on
New'vided
11
subdl lots (sq ft)
sf
sf
12
New infiltrating permeable pavement outside of
lots
fsubdroided (sq m,)
sf
sf
13
Exisitrig BUA
ipe m t�8� �sq ft)t will remain (not subject to
sf
sf_
14
..
Existing BUA That is already„permitted (sq)
if
sf
15Existmg
I be removed s k(
BUA that wll�, (• q )
sf
s f.
16
17
.Percent BUA
Design storm (inches)
22
In
43u
1 In
18
g3esNcn volume of SCSI (ou ft)
cf
1 cf
19
Calculation method for design volume
$ample
le Method
ADDITIONAL INFORMATION
C Please use this space to provide any additional information about the
20
drainage area(s)

INFILTRATION SYSTEM
1
Drainage area number
1
2
2
Desi9 n volume of SCM (cu ft)
13716 cf
27690 cf
3
Is the SCM sized to treat the SW from all surfaces at build -out'
Y"
Yes
4
Is the SCM located away from contain mated soils11 ?
No
No
5
What are the side slopes of the SCM H U ?
p )
3 1
31...
1
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?
Yes
Yes
fr maintenance?
tcleaned
Pump
10
I applpcabiemwv IhthefSCM beor
out after construction? mm
..pump Yesferred)
Yeserred
11
m ®, _
Does the maintenance access comply with General MDC (8)?
—..W.... .... _........
Yes
....
Yes
12
Does the drainage easement aim d with General ht�C (9
g p y ).
.......... ... r,.._.�
Yes
....................
......._...........
Yes
If the SCM is on a siingl1e family lot, does (will?) the plat comply with General-MDC
13
(10)?
14
Is there an OW A,,.. _
reernent� g that complies with General MI�C _ (11��
, ........
Yes...,......
w
. ..
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
16
Does the SCM follow the device specific MDC?
Yes
Yes
17
Was the SCM designed by an NC licensed professional?
...........n.M........
Yes
Yes
INFILTRAT' I SYSTEM,ll' K It0IMOZ]HIJ
18roposed
slope of the subgrade surfaoe°/4)
0%
0
19
Are terraces or baffles provided?
' " ®_
T)n_
4 o
_. 20
e'
pe ofrtrea
....�. �.e.,
bay
ForNeobay
Sails Data
.,
Was the soil investigated in the footprint and at the elevation of the infiltration
_....... ..... ..
21
system?
Yes
Yes
SHWT elevation (fmsl)
118.87
115.91.......
23 Depth to SHWT per soils report (in)
37.00
24 Ground elevation at boring in soils report (fmsi)
128.12
123.08
25 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet?
Yes
Yes
„ 26 Sorl infiltration rate ('in1hr)
2.00
0.50
27 Factor of safetyFS ( ) (2 is recommended) f
2.00
2.00
leva#ions
.........,.. ...
._ .............
29 Bottom elevation (fmsl) .....,
125 ft. _ _....
......... 119 ft
30 �fmsl) elevation Storage
125.ft
..... 119.ft........
31 S pass elevation I'msl
y ( )
127 ft........
122 ft
m.
For Basins Dnl)r
32
Sottom surface area, ftZ:
5769 ft
11033 ft
33
Storage elevation surface area (ft')
8111 ft
17862 ft
For Trenches
Only
. .
34
Length (ft),,
g.
35
.. .. _...,..,,.,
Width (ft) _ ,,, ,,, .,
,.
36
Perforated pipe diameter, if applicable (inches)
37
Nuimberoflaterals
.... ._,
.... _...-..
38
m. �e„ .e.m,
;Total length of perforated piping
�.............
39
Stone type, if applicable m
40
jStone void ratio (^') ...........
T _ .._...
...... ..�..
41
.........„ P, , m, ...
Is stone free of fines?
__ _ ...,
�. ...............
42
; is the stone pp wra ed in eotextile fabric?
9
....
43
Has at least one infiltration port beenprovided?
Volu►nes/Drawdown
44
Deslgn volume off SCM (cu ft
(hours) )
13846 c..
28686 c.... .
46
Time to drawdown
use this space to provide any additional
46
Infiltration 1 10:35 AM 11/25/2020