SW6220505_Supplement-EZ Form_20220607

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Pro'ect Name
Utility Improvements to Serve Shabain Reserve - Phase 1
2
_
Pro'ect Area ac
115.32
-
3
_
Coastal Wetland Area (ac)
4
Surface Water Area ac
-
5
Is thts projoct Ht h or Low Density?
High
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .100(4)
7
Width of vegetated setbacks provided feet
N/A
8
Will the ve etated setback remain vegetated?
N/A
9
If BUA is proposed in the setback, does it meet NCAC 021-1.1003 4 c-d ?
No
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
1
12
Bioretention Cell
0
3
13
Wet Pond
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 Stri LS-FS
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22 1
Dry Pond
0
23
Storm Filter
0
24
Silva Cell
0
25
Bayfilter
0
0
26
Filterra
FORMS LOADED
DESIGNIM CERTIFICATION — --
27
Name and Title: _
Organization: _ _ _
Street address:
Carlo Pardo, PE
28
Bowman North Carolina, Ltd.
29
4006 Barrett Drive, Suite 104
Raleigh. NC 27609
30
City, State, Zip:
IPhone number(s):
Email:
31
919-553-6570
32
[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.
CARO
SEAL -
051571
Signature of Designer
y/a y/aa
Date

DRAINAGE AREAS
1
Is this a high densi ro ect?
Yes
2
If so, number of draina a areas/SCMs
4
3
Does this project have low density areas?
No
4
If so number of low density 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
Wet Pond
Infiltration Basin
Wet Pond
Wet Pond
5
Total drainage area ft
5023339 sf
883772
394402
176822
874858
6
Onsite drainage area (sq ft
883772
394402
176822
874858
7
Offsite drainage area (sq ft
8
Total BUA In project s R
980497 sf
371638 sf
171155 sf
86745 sf
350959 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
10permitting)
New BUA not on subdivided lots (subject to
s
11
Offsite BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
Sidewalk (sq ft
75573 sf
27645 sf
15376 sf
5672 sf
26880 sf
Roof (sq ft
680000 sf
272000 sf
112000 sf
64000 sf
232000 sf
- Roadway s ft
215004 sf
71993 sf
43779 sf
17073 sf
82159 sf
Future (sq ft
Other, please specify in the comment box
below (sq ft
9920 sf
9920 sf
13
New infiltrating permeable pavement on
subdivided 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
Existin_q BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
18
Percent BUA
19.52%
42.1%
43%
490/6
40%
19
Design storm inches
1.0 in
1.0 in
1.0 in
1.0 in
20
Design volume of SCM cu ft
31555 cf
14480 cf
7243 cf
29967 cf
21
Calculation method for dest n volume
Simple Method
Simple Method
Simple Method
Simple Method
ADDITIONAL INFORMATION
Please use this space to proide anvy additional information about the
22 drainage area(s):
12-Postal Kiosk for additional BUA

INFILTRATION SYSTEM
1_Dralnage area number 2
2 Minimum required treatment volume (cu ft)1446V c
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 or enter "Vertical' for
trenches)?
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- ear storm)?
Yes
Is there an overflow or bypass for inflow volume in excess of the
8
design volume?
I Yes
9
What is the method for dewatering the SCM for maintenance?
Pump (pre
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
15
Is there an O&M Plan that complies with General MDC 12 ?
Yes
16
Does the SCM follow the devicespecific MDC?
Yes
17
Was the SCM designed by an NC licensed professional?
es
18 1 Proposed slope of the subgrade surface (%) 0%
19 jAre terraces or bafflesprovided? No
20 IType of pretreatment: Forebay
Soils Data
21
Was the soil investigated in the footprint and at the elevation of the
Infiltrations stem?
Yes
22
SHWT elevation fmsl
189.00
23 .
Depth to SHWT per soils report in
120 in
24
Ground elevation at boring in soils report fmsl
199.00
25
Is a detailed hydrogeologic study attached if the separation is
between 1 and 2 feet?
N/A
26
Soil infiltration rate in/hr
4.00
27
IFactor of safety FS 2 is recommended ,
2.00
IElevations
29
Bottom elevation fmsl
199 ft
30
IStoraga elevation (fmsl)
200.8 ft
31
B ass elevation fmsl
2 4.5 ft
mr erasins vnl
32 Bottom surface area (tt) 7230 ft
33 [Storage elevation surface area ft2 9805. ft
For Trenches Only
34
Length ft
35
Width ft
36
Perforated pipe diameter, if applicable inches
37
Number of laterals
38
Total length of perforated piping
39
Stone type, if applicable
40
Stone porosity. %)
41
Is stone free of fines?
42
Is the stone wra2ped in geotextile fabric?
43
Has at least one Inspection port beenprovided?
Volumes/Drawdown
44 1Design volume of SCM cu ft 14480 cf
45 ITime to draw down (hours) 7.8 hrs
46 Please use this space to provide any additional information about
the infiltration system(s):
Infiltration 1 12:19 PM 4/29/2022

WET POND
1
[Drainage area number
7
3
4
_
21 Minimum required treatment volume cu ft
31555 cf
1 7243 cf
29967 cf
ENERAL
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- ear storm)?
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
desi n volume?
Yes
Yes
Yes
9
What is the method for dewatering the SCM for maintenance?
Pump referred
Pump referred
Pump referred
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 ?
N/A
N/A
N/A
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 02)?
Yes
Yes
Yes
16
D_oes the SCM follow the devicespecific MDC?
Yes
Yes
Yes
17
Was the SCM designed by an NC licensed rofesslonal?
Yes
Yes
Yes
ET POND
MDC FROM 02H.1053
18
Sizing method used
SA/DA
SA/DA
SA1DA
19
Has a stage/storage table been provided in the calculations?
Yes
Yes
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl
206.00
189.00
202.00
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
207.00
190.00
203.00
22
Elevation of the bottom of the vegetated shelf fmsl
211.50
195.50
206.50
23
Elevation of the permanent pool fmsl
212.00
196.00
207.00
24
Elevation of the top of the vegetated shelf fmsl
212.50
196.50
207.50
25
Elevation of the temporary pool fmsl)
213.90
197.50
208.70
26
Surface area of the main permanent pool (square feel
11390
2950
13155
27
Volume of the main permanent pool cubic feet
43138 cf
8526 cf
42764 cf
26
Avera a depth of the main pool (feet)
4.22 ft
3.66 It
3.58 ft
29
Average depth equation used
Equation 3
Equation 3
Equation 3
30
If using equation 3, main pool perimeter.feet)423.0
It
237.0 fl
442.0 It
31
If using equation 3, width of submerged veq. shelf (feet)
3.0 It
3.0 ft
3.0 ft
32
Volume of the foreba cubic feet
6715 cf
1583 cf
7964 cf
33
Is this 15-20% of the volume in the main pool?
Yes
Yes
Yes
34
Clean -out depth for foreba inches
48 in
48 in
48 in
35
Desi n volume of SCM cu ft
31555 cf
7243 cf
29967 cf
36
Is the outlet an orifice or a weir?
Orifice
Orifice
Orifice
37
If orifice, orifice diameter (inches)
2.00 in
1 in
2 in
38
If weir, weir height inches
39
If weir, weir length (inches)
40
Drawdown time for the tempospool (days)
2.44
3.61
3.71
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
Yes
Yes
42
Are berms or baffles provided to improve the flowpath?
Yes
Yes
Yes
43
Depth of forebay at entrance inches
60 in
60 in
60 in
44
Depth of forebay at exit (inches)
24 in
18 in
24 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
Yes
Yes
46
Width of the vegetated shelf feet
6 ft
6 ft
6 ft
47
Slope of vegetated shelf H:V
6:1
6:1
6:1
48
Does the orifice drawdown from below the top surface of the
ermanent pool?
Yes
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
r, 24-hr storm?
Yes
Yes
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC(9) is met.)
No
No
No
51
Is a trash rack or other device provided to protect the oullet system?
Yes
Yes
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
Yes
Yes
53,
S ecies of turf that will be used on the dam and embankment
Hybrid Bermuda
Hybrid Bermuda
Hybrid Bermuda
541
Has a planting Ian been provided for the ve etated shelf?
Yes
Yes
Yes
ADDITIONAL INFORMATION
55
Please use this space to provide any additional information about
the wet pond(s):
Wet Pond 1 12:20 PM 4/29/2022