SW3221001_Supplement-EZ Form_20221006

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
OJECT IN RMATION
1 Project Name
2 Project Area (ac)
3 Coastal Wetland Area ac
4 Surface Water Area (ac)
5 Is this project High or Low Density?
6 Does this project use an off -site SCM?
Brighton Park
86.77
2.08
High
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
85
8
Will the vegetated setback remain vegetated?
Yes
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
MBER AND TYPE
11
Infiltration System
12
Bioretention Cell
13
Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
6
17
Rainwater Harvesting RWH
18
JGreen Roof
19
Level S reader -Filter Strip LS-FS
20
Disconnected Impervious Surface DIS
21
Treatment Swale
22
Dry Pond
23
StormFilter
24
Silva Cell
25
Ba filter
26
Filterra
FORMS LOADED
SIGNER CERTIFICATION
27
Name and Title:
Carlos L. Ruano, P.E.
28
Or anization:
Latham -Walters Engineering Inc.
29
Street address:
16507-A Nonccross Drive
30
Cit , State, Zip:
Huntersville, NC 28078
31
Phone number(s):
704-895-8484
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.
,Q"�oESAR0�/2'
SEAL
S23S6
OS
Seal
Signature of Designer
Date
9/27/2022
J

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
6
3
Does this project have low density areas?
No
4
If so number of low densit drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
3
4
4
Type of SCM
Sand Filter
Sand Filter
Sand Filter
Sand Filter
Sand Filter
5
Total drainage area (sq ft
2791325
777982
426888
386377
416434
6
Onsite drainage area (sq ft)
2791325
777982
426888
386377
416434
7
Offsite drainage area (sq ft
0
0
0
0
0
8
Total BUA in project (sq ft)
1268171
390257 sf
178424 sf
176418 sf
186142 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
843650
225600 sf
133950 sf
122200 sf
126900 sf
10permitting)
New BUA not on subdivided lots (subject to
s
424406
0
0
164657 sf
44475 sf
54102 sf
59242 sf
11
Offsite BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
Parkin (sq ft
11530
11530 sf
Sidewalk (sq ft)
87927
25287 sf
10716 sf
12720 sf
13068 sf
Roof (sq ft
8050
8050 sf
Roadway s ft
316900
119790 sf
33759 sf
41382 sf
46174 sf
Future (sq ft
Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on
Isubdivided lots (sq ft
15permitting)
Existing BUA that will remain (not subject to
s ft
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
18
Percent BUA
45%
50%
42%
46%
45%
19
Design storm inches
6.0 in
6.0 in
6.0 in
6.0 in
6.0 in
20
Design volume of SCM cu ft
32511 cf
15161 cf
14833 cf
15696 cf
21
1 Calculation method for design volume
HydroCAD
HydroCAD
HydroCAD
HydroCAD
HydroCAD
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
6
3
Does this project have low density areas?
No
4
If so number of low densit drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
5
6
4
Type of SCM
Sand Filter
Sand Filter
Sand Filter
5
Total drainage area (sq ft
2791325
350658
432986
6
Onsite drainage area (sq ft)
2791325
350658
432986
7
Offsite drainage area (sq ft
0
0
0
8
Total BUA in project (sq ft)
1268171
136941 sf
199989 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
843650
103400 sf
131600 sf
10permitting)
New BUA not on subdivided lots (subject to
s
424406
0
0
33541 sf
68389 sf
11
Offsite BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
Parkin (sq ft
11530
Sidewalk (sq ft)
87927
8712 sf
17424 sf
Roof (sq ft
8050
Roadway s ft
316900
24830 sf
50965 sf
Future (sq ft
Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on
Isubdivided lots (sq ft
15permitting)
Existing BUA that will remain (not subject to
s ft
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
18
Percent BUA
45%
39%
46%
19
Design storm inches
6.0 in
6.0 in
6.0 in
20
Design volume of SCM cu ft
11732 cf
16803 cf
21
Calculation method for design volume
HydroCAD
HydroCAD
HydroCAD
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

SAND FILTER
11
Drainage area number
1
2
3
4
5
2
1 Minimum required treatment volume cu ft
24384 sf
11371 sf
11125 sf
11772 sf
8800 sf
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Y-es
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
Yes
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
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
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
Yes
Yes
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
Yes
Yes
Yes
Yes
9
What is the method for dewatering the SCM for maintenance?
Drawdown Orifice
Drawdown Orifice
Drawdown Orifice
Drawdown Orifice
Drawdown Orifice
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
Yes
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
Yes
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
Yes
Yes
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
Yes
Yes
151
Is there an O&M Plan that complies with General MDC (12)?
1 Yes
Yes
Yes
Yes
Yes
161
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
Yes
Yes
17
Was the SCM desi ned bv an NC licensedprofessional?
Yes
Yes
Yes
Yes
Yes
SAND FILTER
MDC FROM 02H .1056
18
SHWT elevation (fmsl)
N/A
N/A
N/A
623.71
N/A
19
Type of sand filter (open or closed)
Open
Open
Open
Open
Open
20
If closed, will the filter will be pre -cast or pour -in -place?
N/A
N/A
N/A
N/A
N/A
21
If closed, top of grate elevation (fmsl)
N/A
N/A
N/A
N/A
N/A
22
Is this sand filter designed to attenuate peak flows?
Yes
Yes
Yes
Yes
Yes
I Sediment Chamber
23
Volume that can be retained in the sediment chamber (cubic feet)
18600 cf
12128 cf
9906 cf
no
628.00
12508 cf
no
631.00
7674 cf
no
613.00
24
Will there be a permanent pool in the sediment chamber?
no
609.00
no
634.00
25
Bottom of the sediment chamber (fmsl)
26
Area of the sediment chamber (square feet
9300 sf
6064 sf
4953 sf
6254 sf
3837 sf
27
Physical depth of the sediment chamber (inches)
24 in
24 in
24 in
24 in
24 in
28
Ponding depth in the sediment chamber, above any permanent pool
inches
Elevation of top of weir between chambers (fmsl)
24 in
24 in
24 in
24 in
24 in
29
611
636
630
633
615
Sand Chamber
30
Volume that can be retained in the sand chamber (cubic feet)
8700 cf
4350 cf
7400 cf
5027 cf
5896 cf
31
Bottom of the sand chamber (fmsl)
607.50
632.50
626.50
629.50
611.50
32
Area of the sand chamber (square feet)
2640 sf
1415 sf
1360 sf
1440 sf
1095 sf
33
Physical de th of the sand chamber inches
18 in
18 in
18 in
18 in
18 in
34
Ponding depth in the sand chamber, above the sand surface
(inches)
24 in
18 in
18 in
24 in
24 in
351
Elevation of the bypass device (fmsl)
615
639
633
637
618.5
36
Type of bypass device
Spillway
Spillway
Spillway
Spillway
Spillway
37
Mechanism for distributing flow over the sand surface
Riprap
Riprap
Riprap
Riprap
Riprap
38
Sand specification for sand chamber
ASTM C33
ASTM C33
ASTM C33
ASTM C33
ASTM C33
39
Depth above underdrain pipe (inches)
6 in
6 in
6 in
6 in
6 in
40
Will the media be maintained to drain at least two inches per hour at
the sand surface?
Yes
Yes
Yes
Yes
Yes
41
Is at least one clean -out pipe provided at the low point of each
underdrain line?
Yes
Yes
Yes
Yes
Yes
42
Will clean -out pipes be capped?
I Yes
I Yes
I Yes
Yes
Yes
Sand Filter 4 3:29 PM 9/27/2022

SAND FILTER
1
Drainage area number
6
2
Minimum required treatment volume cu ft
12603 sf
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
4
Is the SCM located away from contaminated soils?
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-year 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, will the SCM be cleaned out after construction?
Yes
11
Does the maintenance access comply 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)?
Yes
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
151
Is there an O&M Plan that complies with General MDC (12)?
1 Yes
161
Does the SCM follow the device specific MDC?
Yes
17
Was the SCM desi ned bv an NC licensedprofessional?
Yes
SAND FILTER
MDC FROM 02H .1056
18
SHWT elevation (fmsl)
N/A
19
Type of sand filter (open or closed)
Open
20
If closed, will the filter will be pre -cast or pour -in -place?
N/A
21
If closed, top of grate elevation (fmsl)
N/A
22
Is this sand filter designed to attenuate peak flows?
Yes
23
Volume that can be retained in the sediment chamber (cubic feet)
15214 cf
24
Will there be a permanent pool in the sediment chamber?
no
618.00
25
Bottom of the sediment chamber (fmsl)
26
Area of the sediment chamber (square feet
7607 sf
24 in
24 in
27
Physical depth of the sediment chamber (inches)
28
Ponding depth in the sediment chamber, above any permanent pool
inches
Elevation of top of weir between chambers (fmsl)
29
620
Snnr/ rh—h-
30
Volume that can be retained in the sand chamber (cubic feet)
8990 cf
31
Bottom of the sand chamber (fmsl)
616.50
32
Area of the sand chamber (square feet)
1630 sf
33
Physical de th of the sand chamber inches
18 in
34
Ponding depth in the sand chamber, above the sand surface
(inches)
24 in
351
Elevation of the bypass device (fmsl)
623
36
Type of bypass device
Spillway
37
Mechanism for distributing flow over the sand surface
Riprap
38
Sand specification for sand chamber
ASTM C33
39
Depth above underdrain pipe (inches)
6 in
40
Will the media be maintained to drain at least two inches per hour at
the sand surface?
Yes
41
Is at least one clean -out pipe provided at the low point of each
underdrain line?
Yes
42
Will clean -out pipes be capped?
I Yes
Sand Filter 5 3:29 PM 9/27/2022