SW3210403_Supplement-EZ Form_20210824

SUPPLEMENT-EZ COVER PAGE
F RM L A E
PROJECT INFORMATION
1 Project Name
_ 2 projecl. Area (ac)
3 .Coastal Wetland Area aC
4 tSurface Water Area tacj _
5 j Is this Mjeci High or Low Densit}(._
6 Does this prpyect use an off -site SCM?
f41PLIANCE WITH 02H .1003(4)
7 Width of vegetated setbacks rovided feet
8 Witl the vegetated setback remain vegetated?
9 If BUA is proposed in the seftClk, does it meet NCAC 02H.1
0 Is streambank stabilization proposed on this project?
NUMBER AND TYPE OF SCM-:
_11 lnfiltralion System
12 Bioretention Cell _
13 -Wet Pond _
J14Stormwater WellandFS.
galb PavementndFilter
_ 17 f Rainwater Harvestin _ W
18 Green Roof
19 Level Spreader -Filter Strip (L5-FS) —
20 Disconne0led Irnpervious Surface {D€5]
21 Treatment Swale
22 Dry Pa
tornd _
23 jSmFilter
24 jShioa Cell
25 [B_W ler
26 IFilterra
Fggmr I. Ao 0
DESIGNER CERTIFICATION
27
Name and Tifle: T
28
(Organization;
29
'Street address:
30
_
City, State, Zip,_
31
Phpne number(s): _
32
iEmail:
233.Randalph 74 Solar I, LLC
0 _
0
Low
No
Yes
No
No
0
0
0
0
0
0
0
0
0
0
0
a
0
v
0
0
Patrick Neadham _ProjeCl Engineer'
McKim & Creed
8020 Tower Point Road
Charlotte, NC, 28227
---704.841725BB
cmfftation 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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043852
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Signature of Designer
0$O1.N /aoa !
Date

DRAINAGE AREAS
1 Is this a huh density project? No
2 If so, number of drainage areas/SCMs 0
3 Does this project have low density areas? Yes
4 If so, number of low density draina a areas 1
Is all/part of this project subject to previous rule
5 aversions? No
FORMSLOACEO
PRAINAGE AREA INFORMATION
4 Jype of SCM
Entire Site
LD
N/A
5 1Total drainage area (sq ft
1157825
6 Onsite draina a area (sq ft
1157825
7 Offsite drainage area (sq ft)
8T0tal BU_A in.. ro"ect ft)
New A o BUn subdivided lots (subject to
9 ermitting)_Lsq�
New BUA not on subdivided lots (subject to
10 ,permittin sf
N/A
179420 sf
N/A
179420 sf
N/A
11..
_
site BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
N/A
Sidewalk (sq ft
N/A
Roof (sq ft)
N/A
Roadway s ft)_58276
sf
Future is M.
N/A
121144 sf
Other, please specify in the comment box
below s ft
13
New infiltrating permeable pavement on
subdivided lots (sq ft)
N/A
N/A
14
New infiltrating permeable pavement not on
subdivided lots ft)
Existing BUA that will remain (not subject to
permitting) (sq ft)
15
N/A _
N/A
N/A
5%
16
Existing BUA that is already Permitted s ft ..
17
Existing BUA that will be removed!Lsqft
18
Percent BUA
Designstorm Cinches)
Desi n volume of SCM_(cu ft)
Calculation method for desi n vol
19
20
21
N/A
N!A
N/A
ADDITIONAL INFORMATION
Please use this space -to -pro -vide any additional information about the
22 1drainage area(s):
Other BUA includes 120 sf for 1 transformer pad, 167.5 sf for panel footings
(670 concrete panel footings at 6" x 6"), and 120,856 sf for array area that
exceeds 8> slopes.

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DE# I Y PRO#E FROM 117H J&3
Is pralecl below density thresholds set forth in the applloebie stormwater rule? _ _
Does project maximize dispersed flow and minimize channelization of Flow?
Has the use of pIong been minimized per .1003(2Hc)?
Side slopes of the vagetalod CAlrveya es (H V)
Maximum valoa_ ity in the vegetated om"yan_ce_s during the 10-year storm?
Are curb outlet swales posed9
1
2
Yes
Yes
3
Yes
_4 _
5
6
'
3:1
3.64
No
7
_
Maximum longitudinal slope of curb outlet swale(s) (%
6
Bottom width of curb outlet swale(�) (feet
9
Maximum side WqT of curb outlet swal 8) Fk;Y
10
Minimum length of curb outlet 8wate(g]. EeSt
11
Are treatment swales used instead of curb outlet swales?
12 Is stormwater released at the Or of the setback as dispersed flow?
13 Have stormwater outlets been designed to prevent downslope erosion?
14 'Ara variations to rule 1003 proposed?
ADDITIONAL INFORMATION
Yes
Yes
NQ
15 ,Please use this space to provide any additional infomaetlonabout this low density project:
Project consists of a solar farm. Swales below coorspond to permanent ditches in plans as follows: Swale 1 = PD #5A, Swale 2
= PD #5B, Swale 3 = PD #6A, Swale 4 = PD #6B. Swales #2(PD #5B) and #4 (PD #613) include the drainage area and BUA
area from the UpStriaerri swales that feed them.
Swale
#
Drainage BUA Pervious
Area area C
ac (ac)
Q Slope V,,uw VFlow depth
(cfs) (%) (fps) (fps) (ft)
1.41 5.00 4.50 3.22 0.38
3.07 9.70 4.00 2.63 0.62
1
2
0.54
0.07
0.47
0.35
1.18
0.19
0.99
0.35
3
1.32
0.31
1,01
0.35
3.44
1.00
4.50
2,20
0.72
4
2.57
0.72
1.85
0.35
6.69
13.70
2.50
3.64
0.78
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6
7
8
9
10
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12
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14
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