SW5220102_Supplement-EZ Form_20220504

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Project Area (ac)
3 Coastal Wetland Area ac
4 Surface Water Area (ac)
5 Is this project Hi h or Low Density?
6 Does this project use an off -site SCM?
NASH SOLAR ARRAY
318
0
7.6
No
COMPLIANCE WITH 02H.1003(4)
7
Width of ve etated setbacks provided feet
50
8
Will the vegetated setback remain vegetated?
Yes
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 thisproject?
No DE
1
u�
Y 0 "12022
-LAIND QUALITY
ffORMWATER PERM T I NNJ
NUMBER
11
AND TYPE OF SCMs:
Infiltration System 0
Bioretention Cell 0
Wet Pond 0
Stormwater Wetland 0
12
13
14
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 (D>S)
0
21
Treatment Swale
0
22
Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
_
Bayfilter
0
26
Filterra
0
FORMS LOADED
ESIGNER CERTIFICATION
27 Name and Title: _ GREGORY R. HOFFM_AN, P.E.
28 Organization:
CIVIL DESIGN CONCEPTS, PA
29 Street address:
168 PATTON AV_E _
30 City, State, Zip:
ASHEVILLE, NC 28801
31 Phone numbers :
828 252-5388
32 Email:
GHOFFMAN CDCGO.COM
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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DRAINAGE AREAS
1
Is this a high 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 drainage areas
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE
4
AREA INFORMATION
Type of SCM
Entire Site
N/A
LD 1
N/A
5
Total drainage area (sq ft
13852080
13852080
6
Onsite drainage area sq ft
13852080
13852080
7
Offsite drainage area sq ft)
N/A :
N/A
8
Total BUA in project (sq ft)
310858 sf
310858 sf
9
New BUA on subdivided lots (subject to
permiin sq ft
N/A
N/A
10
New BUA not on subdivided lots (subject to
permitting) sf
310858 sf
310858 sf
11
Offsite BUA s ft
N/A '
N/A
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft)
N/A
N/A
- Sidewalk sq ft
N/A
N/A
Roof sq ft
N/A
N/A
Roadway s ft
238904 sf
238904 sf
- Future sq ft
N/A
N/A
- Other, please specify in the comment box
below (sq ft)
71954 sf
71954 sf
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
15
Existing BUA that will remain (not subject to
permitting) (sq ft)
N/A
N/A
16
Existing BUA that is already permitted (sq ft)
N/A
N/A
17
Existing BUA that will be removed s ft
64538 sf
64538 sf
18
Percent BUA
2%
2%
19
Design storm (inches)
6.8 in
6.8 in
20
Design volume of SCM (cu 8)
N/A
N/A
21
Calculation method for deli n volume
RATIONAL
RATIONAL
ADDITIONAL 'INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Transformer Pads RLJA and Substation BI IA included in "Other" section. 1440
square feet for the 9 inverter pads and 70514 square feet for the substation
pad.

LOW DENSITY
DESIGN
1
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-1.1003
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 .1 0032 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?
5.43
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%
' N/A
8
Bottom width of curb outlet swales feet
N/A =
9
Maximum side slope of curb outlet swale(s) (H:V)
N/A
10
Minimum length of curb outlet Swale(s) feet
N/A"
11
Are treatment swales used instead of curb outlet swales?
No
12
Is stormwater released at the edge of the setback as dispersed flow?
N/A
13
1 Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
ADDITIONAL
15
Are variations to rule .1003 proposed?
INFORMATION
1 Please use this space to provide any additional information about this low densityproject:
No =
Drainage Pervious
Swale Area BUA area
# ac) (ac) ac
1 2.43 0.00 2.43
C
0.60
Q Slope
(cfs) N
9.93 5.60
V.11..
(fps)
9.50
V, .i Flow depth
(fps) (ft)
5.43 ' 0.59
2
3
4
5
6
7
g
9
10
11
12
13
14
15
16
17
18
20
22
24
25
26
27
28
29
30