SW3191205_SuppEZ-2018-Version-2.1.1_2/11/2020

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
roject Name
R4Surface
roject Area acoastal
Wetland Area
Water Area (a
Windsong Subdivision
53.7
in
5 Ils this project High or Low Density? High
6 1 Does this protect use an off -site SCM? No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
100' & 200'
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1 0034 c-d out of the setback?
Yes
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
0
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
3
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
Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Bayfilter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Tim Foley, Vice President
28
Organization:
Henson Foley Design
29
Street address:
8712 Lindholm Dr #202A
30
City, State, Zip:
Huntersville, NC 28078
31
Phone numbers :
704 875-1615
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.
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SEAL —_
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Seal
Signature of Designer
Date

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so number of drainage areas/SCMs
3
3
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
A INFORMATION
Entire Site
1
2
3
M
Sand Filter
Sand Filter
Sand Filter
inroject s ft
170019 sf
95630 sf
43735 sf
30917 sf
on subdivided lots (subject to
s ft
7permitting)
170,019 sf
95,630 sf
43,735 sf
30,917 sf
outside of subdivided lots (subject to
s
0 sf
0 sf
0 sf
Osf
8
1 Offsite -total area (sq ft
68,552 sf
4,374 sf
43,916 sf
20 262 sf
9
Offsite BU(sq ft
0 sf
0 sf
0 sf
0 sf
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
41,126 sf
22,434 sf
13,241 sf
5,451 sf
Sidewalk (sq ft
0 sf
0 sf
0 sf
0 sf
Roof (sq ft
84,357 sf
43,857 sf
23,400 sf
17,100 sf
Roadway s ft
50,437 sf
29,338 sf
12,735 sf
8,364 sf
Future (sq ft
0 sf
0 sf
0 sf
0 sf
Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots (sq ft
0 sf
0 sf
0 sf
0 sf
12
New infiltrating permeable pavement outside of
Isubdivided lots (sq ft
0 sf
0 sf
0 sf
0 sf
13permitting)
Exisitng BUA that will remain (not subject to
s ft
0 sf
0 sf
0 sf
0 sf
14
Existing BUA that is already permitted (sq ft
0 sf
0 sf
0 sf
0 sf
15
Existing BUA that will be removed (sq ft
0 sf
0 sf
0 sf
0 sf
16
Percent BUA
0 sf
0 sf
0 sf
0 sf
17
Design storm inches
3 in
3 in
3 in
3 sf
18
1 Design volume of SCM cu ft
78007 cf
40882 cf
21328 cf
15797 cf
19
1 Calculation method for design volume
Hydro CAD
Hydro CAD
Hydro CAD
Hydro CAD
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):

SAND FILTER
MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion (10-
1year storm)?
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
Yes
Yes
9
What is the method for dewatering the SCM for maintenance?
Pump (preferred)
Pump (preferred)
Pump (preferred)
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
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)?
Yes
Yes
Yes
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
No
No
No
16
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
17
Was the SCM designed by an NC licensed professional?
Yes
Yes
Yes
ISAND FILTER MDC FROM 02H .1056
18
SHWT elevation (fmsl)
19
Type of sand filter (open or closed)
Open
Open
Open
20
If closed, will the filter will be pre -cast or pour -in -place?
21
If closed, top of grate elevation (fmsl)
22
Is this sand filter designed to attenuate peak flows?
Yes
Yes
Yes
Sediment Chamber
23
Volume that can be retained in the sediment chamber (cubic feet)
2096 cf
910 cf
776 cf
24
Will there be a permanent pool in the sediment chamber?
No
No
No
25
Bottom of the sediment chamber (fmsl)
553.00
558.00
553.00
26
Area of the sediment chamber (square feet)
2096 sf
910 sf
776 sf
27
Physical depth of the sediment chamber (inches)
12 in
12 in
12 in
28
Ponding depth in the sediment chamber, above any permanent pool
(inches)
12 in
12 in
12 in
29 Elevation of top of weir between chambers (fmsl)
554
559
554
Sand Chamber
30
Volume that can be retained in the sand chamber (cubic feet) 1200 cf
500 cf
575 cf
31
Bottom of the sand chamber (fmsl) 550.50
555.50
550.50
32
Area of the sand chamber (square feet) 480 sf
200 sf
230 sf
33
Physical depth of the sand chamber (inches)
30 in
30 in
30 in
34
Ponding depth in the sand chamber, above any permanent pool
(inches)
0 in
0 in
0 in
35
Elevation of the bypass device (fmsl)
557
562
556
36
Type of bypass device
Control Structure
Control Structure
Control Structure
37
Mechanism for distributing flow over the sand surface
38
Sand specification for sand chamber
ASTM C33
ASTM C33
ASTM C33
39
Depth above underdrain pipe (inches)
42 in
42 in
42 in
40
Will the media be maintained to drain at least two inches per hour at
the sand surface?
Yes
Yes
Yes
41
Is at least one clean -out pipe provided at the low point of each
underdrain line?
Yes
Yes
Yes
42
lWill clean -out pipes be capped?
Yes
Yes
Yes
ADDITIONAL
INFORMATION
43
Please use this space to provide any additional information about the
Sand Filter(s):
Sand Filter 1 2:13 PM 10/21/2019