SW4220201_Supplement-EZ Form_20220926

SUPPLEMENT-EZ COVER PAGE
PROJECT INFORMATION
1 Project Name
2 le r r-
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?
Hanes Lake Phase 2
48.63
0
Both High and Low p_erisity
Yes
IOMPLIANCE WITH 02H :1003(4.)
7 Width of vegetated setbacks provided (feet). _ - 30
8 Will the. vegetated setback remain vegetated? _ _ _-- _ Yes
9 If BI:IA is proposed in the setback, does it meal NCAC 021­1.100A4)(Cd N/A
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMS:
_11^
Infiltration 5.ystem
12
Bioretention Cell
13
Wet Pond
14
_
Storm+ivatu Wetland _
15
Permeable Pavement
17 Rainwater Haryestft RWH} —
18 1Green Roof
19 Level Spreader -Filter Strip (LS-FS)
20 Disconnected ImpetvtDuS Suffam-WIS). _
21 TreM ment:Swale
22 Dry Pond
23 StormFilter
�- Silva Cell
25 BaytBar _
26 Filterra
FORMS LOADED
,ESIGNER CERTIFICATION
27 Name and Title:
28 QrganizatidW _
29 Street address:
39 City. State, Zfp_ __-
31 Phone nuirtber(s): 704-560-8514
32 Email: ^ pstimpson{glabellapc.com
6
Paul Stimpson, PE Regional Leader/Office Man
LaBelta Associates, PC
939 Burke Street, Suite H
Winstbn�Saiem, NC 27101
Certification Slatement
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.
paAp9tlll]Vf�N,
1714-0 e-
. _i?� 7
Signature of Designer
2,
Date

DRAINAGE AREAS
1
! Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs T
_
6 ,
3
Does this rn'ect have low dens' areas?
Yes
4
If so, number of low.density drainage areas
5
5
Is all/part of this project subject to previous rule
veisions?
No
CLICK TO LOAD FORM
DRAINAGE AREA INFORMATION
Entire Site
1
2
3
4
5
6
LD 1
4 Type of SCM
I Ba iter/LD
Bayftiter
Ba iter
Ba iter
Ba iter
Ba iter
Offsite Ba iter A
grass channels
5 Total drainage areas ft)
2,118,322.80
253,954.80
179031.6
490,921.20
219,542.40
321,908.40
179 467.20
142,441.20
6 Onsite drainage area (sq ft)
2,118,322.80
253,954.80
179031.6
490,921.20
219,542.40
321 908.40
7 Offsite drainage area (sq ft)
0
0
0
0
0
0
8 'Total B ro ect ..s ft
676813 sf
101930 sf
62290.8
209959 sf
88862 sf
120226 sf
2 58500 sf
35,045 sf
New BUA on subdivided lots (subject to permitting)
9 (sq ft
422978 sf
73318 sf
44949.8 sf
110214 sf
52758 sf
83186.00 sf
{ 32517 sf
26064 sf
New BUA not on subdivided lots (subject to
10 permitting) (sf)
11 Offsite BUA (sq ft)
12 Breakdown of new BUA not on subdivided lots.
_ 253835 sf
N/A
28612 sf
17341 sf
99745 sf
N/A
36104 sf
37069 sf {
25983 sf
8981 sf
NIA
N/A
NIA
NIA
NIA
N/A
N/A
N/A
- Parkin (sq ft)
N/A
NIA
NIA
N/A
-.Sidewalk (sq ft)
3909 sf
2651sf
16373 sf
7682 sf
5770 sf A
"L- 3964 sf
882 sf
- Roofs ft
NIA
N/A
N/A
N/A
N/A
NIA
NIA
N/A
- Roadway s ft
24703 sf
14690
83372 sf
28422 sf
31299 sf
122019 sf
8099 sf
- Future (sq ft
N/A
N/A
NIA
N/A
N/A
NIA
NIA
N/A
- Other, please specify in the comment box
below (sq ft
N/A
NIA
NIA
NIA
N/A
NIA
NIA
N/A
INew infiltrating permeable pavement on
13 subdivided lots (sq ft)
N/A
NIA
NIA
N/A
N/A
NIA
NIA
NIA
New infiltrating permeable pavement not on
14 Isubdivided lots (sq ft_
i Existing BUA that will remain (not subject to
15permitting) sq ft)
N/A
NIA
NIA
NIA
N/A
NIA
N/A
NIA
NIA
N/A
NIA
N/A
NIA
NIA
N/A
N/A
16 [[ExistiaQ BUA that is already permitted (sq ft
102802 sf
NIA
NIA
N/A
N/A
N/A
102802 sf
N/A
17 j Existing BUA that will be removed (sq ft)
N/A
N/A
NIA
N/A
N/A
NIA
NIA
N/A
18 Percent BUA
32%
40%
35%
43%
40%
37%
57%
24%
19 Design storm (inches)
1.0 in
1.0 in
1.0 in
1.0 in
1.0 in
1.0 in
1.0 in
1.0 in
20 Design volume of SCM cu ft
58,308 cf
8703 cf
5418 cf
17792 cf
7579 cf
10358 cf
8458 cf
N/A
21 'Calculation method for design volume
volume A
volume
volume
volume
volume
volume
volume
NIA
INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Phase 2 d.a. is 48.63 acres_ Offsite SCM A is in Phase 1 and was oversized;
the actual drainage areas, in phase 2, were not precisely known when SCM A
;was designed. L D areas 1-5 comprise 3.27 acres. Also, there is an additional
area of vegetated buffer/planting areas about the perimeter of the project.

OFF -SITE SCM
THE DRAINAGE AREA
1 Drainage area number for this project
2 'Master permit number
3 Drainage area number from the master permit
4 ; Lot or outparcel number
5 BUA allocated by Master Permit
SCM A
SWA-000100
SCM A
Phase 1 lots (177 &
178)
102802 sf
INFORMATION ABOUT THE OFF -SITE SCM
g IType of off -site SCM Bayfilter
7 jAvailable treatment capacity in the off -site SCM (cu ft) 8458 cf
g Have deed restrictions limiting the BUA on the site been recorded? Yes
9 !Has an Engineer's Certification for the off -site SCM been submitted to DEQ? No
10 Are there any Notices of Violation for the off -site system? No
11 -'Has the off -site SCM been maintained in accordance with its O&M Plan? No
12�Will the collection system be maintained in its design state and kept clean? Yes
ADDITIONAL INFORMATION
13 1 Please use this space to provide any additional information about the off -site SCM(s):
This stormwater control measure is in phase 1 and has been installed; however, the bayfilter cartridges will
not be installed until the phase 1 houses are built. The Engineer's certification will be submitted once the
bayfilter cartridges have been installed. Approval of this measure was through SWA 000100_ SCM A was
oversized to be conservative; at the time of the Phase 1 design, the exact drainage areas in Phase 2 were not
known. The DA line for how this SCM A was sized is shown on sheet C4.4

LOW DENSITY
1
Is project below density thresholds set forth in the applicable.stormwater rule?
Yes
2
Does project maximize disad flow and minimize channelization of flow? _
Yes
3
Has the use of plpmg been minimized per .1003(2}(C]?_
Yes
4
Side slopes of the vegetated conveyances (H: V) _ _
3H:1 V
5
Maximum velocity in the vegetated conveyances during the ID -year storm?
6.73
6
;Are curb outlet swales . pasecr _ _
Yes
7
Maximum longitutlinal slope of curb outlet swales)
8
Bottom width of curb outlet syaale(s} [feat]
9
Maximum side slope of curb outlet swales} (H:V) _ _ _ _
_ _ _ . _ _ .. 3.1
10
Minimum of curb outlet sw81e(s) (feet} _
r
`70
11
^
Are treatment swales used instead of curb outlet swales? _ _
_ No
12
_
Is stormwater released at the edge of the setback as dispersed flow? _ _
Yes
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
.Are variations to rule .1003 proposed? l
No
15 Please use this space to provide any additional information about this low densih prajeCL
i
'From point D to curb outlet at the existing parking area, the length of the swale is 70 feet because the flow is released at the edge .
of the buffer. From point E to the parking lot the swale length is 128 feet; there is an approximate 60" oak tree that is being
preserved.
Swale
#
Drainage
Area
ac
Pervious
BUA i
area
(ac)
ac
C
Q
(cfs)
Slope
(1/6)(fo)
V,,a.
V;,,,,,
(foal
de th
Flow P
(ftl
1
6.10
0.13
5.97
0.60
25.25
5.00
17.00
6.73
0.83
2
0.89
0.20
0.79
0.60
3,68
5.00
11.00
3.92
0.32
3
0.58
0.15
0.43
0.60
2.60
5.00
5.00
3.54
0.26
4
0.43
0.01
0.42
0.60
1.78
1.50
5.00
2.09
0.29
5
0.70
0.31
0.39
0.60
2.89
I 5.00
, 11.00
3.65
0.28

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