SW5220101_Supplement-EZ Form_20220728

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Project Area (ac)
3 Coastal Wetland Area (ac)
Hardee's - Main Street
2.07
5 Ils this project High or Low Density? Both High and Low Density
6 1 Does this protect use an off -site SCM? 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)?
N/A
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
12
Bioretention Cell
13
Wet Pond
14
Stormwater Wetland
1
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting (RWH)
18
JGreen Roof
19
Level Spreader -Filter Strip (LS-FS)
20
Disconnected Impervious Surface (DIS)
21
Treatment Swale
22
Dry Pond
23
StormFilter
24
Silva Cell
25
Bayfilter
Filterra
26
FORMS LOADED
DESIGNER CERTIFICATION
27 1 Name and Title:
28 Organization:
Davidl- Smith, PE
McAdams
1 30 (City. State. Zip: I Durham. NC. 27713 1
1 32 JEmail: I [e-mail] I
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.
1�W111�f#II
N C A Rp�
r
SEAL yr
= 20744 =
�?ocSt 07/15/22
Signature of Designer
Date

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
1
3
Does this project have low density areas?
Yes
4
If so, number of low density drainage areas
2
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
LD 1
LD 2
4
Type of SCM
Sub 1 to SCM A
Sub 1 Bypass
Sub 2
5
Total drainage area (sq ft
90115.00
75,649
9,786
4,680
6
Onsite drainage area (sq ft)
90115.00
75,649
9,786
4,680
7
Offsite drainage area (sq ft
0
0
0
0
8
Total BUA in project (sq ft)
61490 sf
60187 sf
1303 sf
9
New BUA on subdivided lots (subject to permitting)
1 (sq ft
61490 sf
60187 sf
1303 sf
10
New BUA not on subdivided lots (subject to
permitting) (sf)
11
Offsite BUA s ft
12
Breakdown of new BUA not on subdivided lots:
- Parkinq (sq ft
32324 sf
31021 sf
1303 sf
- Sidewalk (sq ft)
2285 sf
2285 sf
- Roof (sq ft)
3099 sf
3099 sf
- Roadway (sq ft)
- Future (sq ft
23782 sf
23782 sf
- Other, please specify in the comment box
below (sq ft)
13
New infiltrating permeable pavement on
Isubdivided lots (sq ft
14
New infiltrating permeable pavement not on
subdivided 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
1 Percent BUA
68%
80%
13%
0%
19
1 Desi n storm inches
1.0 in
1.0 in
20
1 Design volume of SCM (cu ft)
5831 cf
5831 cf
21
1 Calculation method for design volume
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
1 = Subbasin 1 to SCM A

STORMWATER WETLAND
1
Drainage area number
1
2
Minimum required treatment volume cu ft
4829 cf
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)?
N/A
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)?
Yes
16
Does the SCM follow the device specific MDC?
Yes
17
Was the SCM designed by an NC licensedprofessional?
Yes
STORMWATER
WETLAND MDC FROM 02H .1054
18
Design volume of SCM (cu ft)
5831
19
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
20
Are berms or baffles provided to improve the flow path?
No
21
Does the orifice drawdown from below the top surface of the
permanent pool?
Yes
22
Does the wetland minimize impacts to the receiving channel from the 1-
yr, 24-hr storm?
Yes
23
Is a trash rack or other device provided to protect the outlet system?
Yes
Elevations
24 1 Elevation, peak attenuation above temporary pool (if applicable) (fmsl) 1 273.57
1 251 Elevation, temporary pool (top of the temporary inundation zone) (fmsl) 1 273.25 1
1 261 Elevation, permanent pool (top of the shallow water zone) (fmsl) 1 272.00 1
I 28I Elevation, bottom of forebay deep pool at deepest point (at forebay 268.67 I
entrance) (fmsl)
29 Elevation, bottom of forebay deep pool at shallowest point (at forebay 26' 00
1 30 1 Elevation, bottom of non-forebay deep pool at deepest point (fmsl) 1 269.00 1
31
Area, total surface area of the SW wetland at temporary pool elev. (sq
ft)
5,740.00
32
Area, temporary inundation zone at temporary pool elev. (sq ft)
2,311.00
33
Area, shallow water zone at temporary pool elev. (sq ft)
2,507.00
34
Area, forebay at temporary pool elev. (sq ft)
631.00
35
Area, non-forebay deep pool at temporary pool elev .(sq ft)
291.00
36
Percent area provided, temporary inundation zone (should be 30-45%)
40 %
provided, shallow water zone (should be 35-45%)
44 %
provided, deep pool (forebay) (should be 10-15%)
�Percent
11 %
provided, deep pool (non-forebay) (should be 5-15%)
5%
Depths and Outlet
40
41
42
43
44
45
46
47
48
49
Peak attenuation depth above temporary inundation zone (inches)
4 in
Temporary inundation zone depth (temporary pool to permanent pool)
15 in
(inches)
Shallow water zone depth (permanent pool to bottom of wetland)
9 in
(inches)
Depth, forebay at entrance (permanent pool to bottom of forebay
40 in
entrance) (inches)
Depth, forebay at exit (permanent pool to bottom of forebay exit)
36 in
(inches)
Depth, non-forebay deep pools (permanent pool to deep pool bottom)
36 in
(inches)
If there is an orifice, diameter (inches)
1 in
If there is a weir, weir height (inches)
If there is a weir, weir length (inches)
Drawdown time for the temporary pool (days)
3.10
Wetland 3 2:33 PM 7/15/2022

STORMWATER WETLAND
Soil and Plants
50
Soil amendment depth (inches)
6 in
51
Has a soil amendment specification been provided?
Yes
52
Has a landscaping plan that meets SW Wetland MDC (12) been
Yes
provided?
53
Number of plants per 200 square feet (#) in the shallow water zone:
54
Does the temporary inundation zone planting comply with SW Wetland
Yes
MDC (14)?
55
Are the dam structure and temporary fill slopes planted in non-
Yes
clumping turfgrass?
56
1 Will cattails be planted in the wetland?
No
ADDITIONAL
INFORMATION
57 Please use this space to provide any additional information about the
stormwater wetland(s):
24) Peak Attenuation for the 1 yr, 24-hr storm
42) Shallow Water zone depth = average/design depth for this zone = 6"
Total Depth = 9"
53) 50 plants per 200 square feet
Wetland 4 2:33 PM 7/15/2022

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
1
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)
4 sf
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
2
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
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?
Yes
12
Is stormwater released at the edge of the setback as dispersed flow?
N/A
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
Are variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15 iPlease use this space to provide any additional information about this low density project:
Half of onsite area (backside of SCM) leaves site via overland flow (grass). The other half including the
impervious area (0.03 ac) flows off site via a roadsidevegetated ditch. The drainage area and C shown
represent the total drainage to the roadside grass ditch which is predominently off site areas.
Swale
#
Drainage
Are
Area
(ac1
EtUA
(ac)
Pervious
are a
re(ac
C
Q
(cfs)
Slope
N
Vail°w
(fps)
V,�°,i
(fps)
Flow depth
(ft)
0.51
0.31
0.20
0.70
2.70
3.00
2.00
1.62
0.75
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
1
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)
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
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?
12
Is stormwater released at the edge of the setback as dispersed flow?
N/A
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
Are variations to rule .1003 proposed?
No
ADDITIONAL INFORMATION
15 Please use this space to provide any additional information about this low density project:
Drainage area discharges from the site in unconcentrated overland flow on grass
Swale
#
Drainage
Are
Area
(ac1
EtUA
(ac)
Pervious
are a
re(ac
C
Q
(cfs)
Slope
N
Vail°w
(fps)
V,a°,i
(fps)
Flow depth
(ft)
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30