SW4220503_Supplement-EZ Form_20220909

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DocuSign Envelope ID: 8BCF71 FB-66B3-4F5F-A569-3ADB12BD66EA
I FORMS LOADED I
PROJECT INFORMATION
1 lProiect Name
Project Area (ac)
Coastal Wetland Area (ac)
Surface Water Area (ac)
Is this project High or Low Density?
Does this project use an off -site SCM?
CANE CREEK - PHASE 8
44.31
N/A
1.05
LOW
NO
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
N/A
8
Will the vegetated setback remain vegetated?
N/A
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
No
10
I Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration S stem
0
12
Bioretention Cell
0
13
Wet Pond
0
14
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 Impervious Surface (DIS)
0
21
Treatment Swale
13
22
Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
JBayfilter
0
26
1 Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
TOM SPEIGHT JR., PLS, PE
28
Or anization:
BATEMAN CIVILSURVEY COMPANY
29
Street address:
2524 RELIANCE AVENUE
30
City, State, Zip:
APEX, NC 27539
31
Phone numbers :
919.577.1080
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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Signature of Designer
09.07.22
Date

DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
0
3
Does this roiect have low densit 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
AREA INFORMATION
Entire Site
LID 1
4
T pe of SCM
N/A
N/A
5
Total drainage area (sq ft
1 975 543
11975,543
6
Onsite drainage area (sq ft
1 975 543
11975,543
7
Offsite drainage area (sq ft
0
0
8
Total BUA in project (sq ft
236,907
236,907
9permitting)
New BUA on subdivided lots (subject to
s ft
139,536
139,536
10permitting)
New BUA not on subdivided lots (subject to
s
94,179
94,179
11
Offsite BUA (sq ft
0
0
12
1 Breakdown of new BUA not on subdivided lots:
Parking (sq ft
0
0
Sidewalk (sq ft
0
0
Roof (sq ft
0
0
Roadway s ft
94,179
94,179
Future (sq ft
0
0
Other, please specify in the comment box
below (sq ft
n/a
n/a
13
New infiltrating permeable pavement on
subdivided lots (sq ft
n/a
n/a
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
n/a
n/a
15permitting)
Existing BUA that will remain (not subject to
s ft
3,196
3,196
16
Existing BUA that is already permitted (sq ft
0
0
17
Existing BUA that will be removed (sq ft
0
0
18
Percent BUA
12
12
19
Design storm inches
n/a
n/a
20
Design volume of SCM cu ft
n/a
n/a
21
Calculation method for design volume
n/a
n/a
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
ALL DRAINAGE GOES TO (1) ANALYSIS POINT. THE CORRECT BUA
PERCENT IS 11.53%, HOWEVER LINE 18 IS AUTOFILLING TO THE
ROUNDED 12.

LOW DENSITY
DESIGN
1
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
Is project below density thresholds set forth in the applicable stormwater rule?
Yes
2
Does project maximize dispersed flow and minimize channelization of flow?
Yes
3
Has the use of piping been minimized per .1003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
(3:1)
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
13.51
6
lAre curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
0
8
Bottom width of curb outlet swale(s) (feet)
9
Maximum side slope of curb outlet swale(s) (H:V)
10
Minimum length of curb outlet swale(s) (feet)
11
Are treatment swales used instead of curb outlet swales?
No
12
1 Is stormwater released at the edge of the setback as dispersed flow?
Yes
13
1 Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
JAre variations to rule .1003 proposed?
No
ADDITIONAL
INFORMATION
15
Please use this space to provide any additional information about this low density project:
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
Q
(cfs)
Slope
( % )
Va„o„,
(fps)
Va-a,
(fps)
Flow depth
(ft)
1
3.30
0.53
2.77
0.50
2.23
4.65
3.62
3.62
0.25
2
0.61
0.17
0.44
0.50
0.42
4.29
2.41
2.41
0.08
3
4.75
0.82
3.93
0.50
3.23
4.98
3.94
3.94
0.29
4
0.88
0.10
0.78
0.50
0.59
4.78
2.22
2.22
0.12
5
0.76
0.16
0.60
0.50
0.51
5.88
2.29
2.29
0.08
6
0.28
0.06
0.22
0.50
0.19
1.00
0.99
0.99
0.09
7
3.39
0.53
2.86
0.50
2.44
5.50
4.38
4.38
0.50
8
0.93
0.53
0.40
0.50
1.36
4.79
3.00
3.00
0.17
9
0.50
0.23
0.27
0.50
0.35
3.51
2.32
2.32
0.08
10
1.10
0.33
0.77
0.50
0.76
4.27
2.61
2.61
0.17
11
0.34
0.11
0.23
0.50
0.23
5.78
1.97
1.97
0.08
12
0.36
0.12
0.24
0.50
0.32
5.67
1.97
1.97
0.08
13
0.34
0.11
0.23
0.50
0.23
1.91
1.23
1.23
0.08
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

TREATMENT SWALE
11 Drainage area number
21 Design flow rate of SCM
GENERAL MDC FROM 02H .1050
TS 1 TS 2 TS 3A TS 3E TS 4 TS 5A
169.87 cfs 163.30 cfs 175.83 cfs 172.36 cfs 191.15 cfs 78.80 cfs
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
Yes
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
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
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No
No
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-yearstorm)?
Yes
Yes
Yes
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
No
No
No
No
No
No
9
What is the method for dewatering the SCM for maintenance?
Other
Other
Other
Other
Other
Other
10
If applicable, will the SCM be cleaned out after construction?
N/A
N/A
N/A
N/A
N/A
N/A
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
Yes
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
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
Yes
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
Yes
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
Yes
Yes
Yes
Yes
16
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
Yes
Yes
Yes
17
Was the SCM designed by an NC licensedprofessional?
Yes
Yes
Yes
Yes
Yes
Yes
TREATMENT SWALE MDC FROM 02H .1061
18
SHWT elevation (fmsl)
473
471
497.5
496.5
490
516
19
Bottom of the treatment swale (fmsl)
476.00
474.00
502.50
501.50
495.00
521.00
20
Depth of treatment swale (feet)
2 ft
2 ft
2 ft
2 ft
2 ft
2 ft
21
Is the swale trapezoidal in shape?
Yes
Yes
Yes
Yes
Yes
Yes
22
Width of bottom of swale (feet)
2 ft
2 ft
2 ft
2 ft
2 ft
2 ft
23
Side slopes of treatment swale (H:V)
3:1
3:1
3:1
3:1
3:1
3:1
24
Length of swale (feet)
581 ft
638 ft
472 ft
135 ft
277 ft
200 ft
25
Flow depth during the 0.75 inch/hour storm (inches)
3 in
1 in
3 in
1 in
1 in
1 in
26
Flow velocity during the 0.75 inch/hour storm (feet per second)
4 ft/s
2 ft/s
4 ft/s
2 ft/s
2 ft/s
1 ft/s
27
Hydraulic retention time for swale (minutes)
5 min
5 min
5 min
5 min
5 min
5 min
281
Species of grass that will be used
Liner
Liner
Liner
Liner
Liner
Liner
29
Will the grass be maintained at an average height of 6 inches?
Yes
Yes
Yes
Yes
Yes
Yes
30
Will the grass not be cut lower than 4 inches?
Yes
Yes
Yes
Yes
Yes
Yes
31
Velocity during the 10-year storm (feet per second)
4 ft/s
3 ft/s
5 ft/s
3 ft/s
3 ft/s
1 ft/s
32
Is the swale designed to non-erosively pass the 10-year storm? Yes Yes Yes Yes Yes Yes
INFORMATION
ADDITIONAL
33
Please use this space to provide any additional information about the
treatment swale(s):

TREATMENT SWALE
11
Drainage area number
TS 5B
TS 6
TS 7
TS 8
TS 9
TS 10
21
Design flow rate of SCM cfs
283.30 cfs
172.46 cfs
147.63 cfs
162.83 cfs
189.45 cfs
187.64 cfs
GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
Yes
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
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
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-yearstorm)?
Yes
Yes
Yes
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
No
No
No
No
No
No
9
What is the method for dewatering the SCM for maintenance?
Other
Other
Other
Other
Other
Other
10
If applicable, will the SCM be cleaned out after construction?
N/A
N/A
N/A
N/A
N/A
N/A
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
Yes
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
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
Yes
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
Yes
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
Yes
Yes
Yes
Yes
16
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
Yes
Yes
Yes
17
Was the SCM designed by an NC licensedprofessional?
Yes
Yes
Yes
Yes
Yes
Yes
TREATMENT SWALE MDC FROM 02H .1061
18
SHWT elevation (fmsl)
491
480
477.1
503.5
499
499
19
Bottom of the treatment swale (fmsl)
495.00
485.00
483.10
508.50
504.00
504.00
20
Depth of treatment swale (feet)
3 ft
2 ft
2 ft
2 ft
2 ft
2 ft
21
Is the swale trapezoidal in shape?
No
Yes
Yes
Yes
Yes
Yes
22
Width of bottom of swale (feet)
0
2 ft
2 ft
2 ft
2 ft
2 ft
23
Side slopes of treatment swale (H:V)
3:1
3:1
3:1
3:1
3:1
3:1
24
Length of swale (feet)
473 ft
482 ft
725 ft
525 ft
467 ft
361 ft
25
Flow depth during the 0.75 inch/hour storm (inches)
6 in
2 in
1 in
2 in
1 in
1 in
26
Flow velocity during the 0.75 inch/hour storm (feet per second)
4 ft/s
3 ft/s
2 ft/s
3 ft/s
2 ft/s
2 ft/s
27
Hydraulic retention time for swale (minutes)
5 min
5 min
5 min
5 min
5 min
5 min
281
Species of grass that will be used
Liner
Liner
Liner
Liner
Liner
Liner
29
Will the grass be maintained at an average height of 6 inches?
Yes
Yes
Yes
Yes
Yes
Yes
30
Will the grass not be cut lower than 4 inches?
Yes
Yes
Yes
Yes
Yes
Yes
31
Velocity during the 10-year storm (feet per second)
5 ft/s
4 ft/s
2 ft/s
3 ft/s
2 ft/s
3 ft/s
32
Is the swale designed to non-erosively pass the 10-year storm? Yes Yes Yes Yes Yes Yes
INFORMATION
ADDITIONAL
33
Please use this space to provide any additional information about the
treatment swale(s):

TREATMENT SWALE
Drainage area number
21Design flow rate of SCM
ENERAL MDC FROM 02H .1050
TS 11
108.90 cfs
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?
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-yearstorm)?
Yes
No
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
9
What is the method for dewatering the SCM for maintenance?
Other
10
If applicable, will the SCM be cleaned out after construction?
N/A
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
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
16
Does the SCM follow the device specific MDC?
Yes
17
Was the SCM designed by an NC licensedprofessional?
I Yes
-I I
--I avvr IV- F-VI vcn .ivvi
18
SHWT elevation (fmsl)
516
19
Bottom of the treatment swale (fmsl)
521.00
20
Depth of treatment swale (feet)
2 ft
21
Is the swale trapezoidal in shape?
Yes
22
Width of bottom of swale (feet)
2 ft
23
Side slopes of treatment swale (H:V)
3:1
24
Length of swale (feet)
230 ft
25
Flow depth during the 0.75 inch/hour storm (inches)
1 in
26
Flow velocity during the 0.75 inch/hour storm (feet per second)
1 ft/s
27
Hydraulic retention time for swale (minutes)
5 min
281
Species of grass that will be used
Liner
29
Will the grass be maintained at an average height of 6 inches?
Yes
30
Will the grass not be cut lower than 4 inches?
Yes
31
Velocity during the 10-year storm (feet per second)
2 ft/s
32
Is the swale designed to non-erosively pass the 10-year storm? Yes
INFORMATION
ADDITIONAL
33
Please use this space to provide any additional information about the
treatment swale(s):