SW1210501_Supplement-EZ Form_20210813

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 High or Low Densi ?
6 Does this oroiect use an off -site SCM?
COMPLIANCE WITH 02H .
7 1Wd1h of vegetated s
Wastewater Treatment Plan Improvements Ph 1
962
0 _
II _ Loy,
Na
30
9 If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ? NIA
10 1 Is streambank stabilization proposed an this project? No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
0
13
Wet Pond
0
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
0
17
j Rainwater Harvesting RWH
0
18
Green Roof
0
19
Level Spreader -Filter Strip LS-FS
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22
Dry Pond
f
0
23
StormFilter
_
0
24
lSilvaCell
0
25
Sa filter
0
26
IFilterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Thomas Mannino, P.E.
28
Organization:
McGill Associates
29
Street address:
55 Broad Street
30
City, State, Zj :
Asheville, NC 28801
31
Phone numbers :
828.252.0575
32
Email:
[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.
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Signature of Designer T�
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Date %

DRAINAGE AREAS
.............................................................................................................................................................................................................................................................................
1
Is this a hi h densi roject?
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
Is all/part of this project subject to previous rule
5
versions?
No
FaEnnsi..aaPF.
DRAINAGE AREA INFORMATION
Entire Site
LD 1
4
Type of SCM
N/A
5
Total drainage area (sq ft)
419047
419047
6
Onsite drainage area (sq ft
419047
419047
7
Offsite drainage area (sq ft)
8
Total BOA in project (sq ft
146984 sf
146984 sf
New BUA on subdivided lots (subject to
9
permitting) (sq ft)
N/A..
New BUA not on subdivided lots (subject to
10
permitting) (sf)
29979 sf
29979 sf
11
Offsite BUA (sq ft)
N/A
12
Breakdown of new BUA not on subdivided lots:
Parking. (N ft) ..
Sidewalk (sq ft)....
2886 sf
2886 sf
Roof (sq ft)
6749 sf
6749 sf
Roadway (sq ft)
17016 sf„
17016 sf
Future (sq ft)
N/A..
Other, please specify in the comment box
below (sq ft
3328 sf
3328 sf
New infiltrating permeable pavement on
13
subdivided lots (sq ft)
N/A
New infiltrating permeable pavement not on
14
subdivided lots (sq ft
N/A
Existing BUA that will remain (not subject to
15
permitting) (sq ft)
117005 sf
117005 sf
16
Existing BUA that is already permitted (sq ft)
17
Existing BUA that will be removed (sq ft)
11968 sf„
11968 sf
18
Percent BUA
19
Design storm (inches)
20
Design volume of SCM (cu ft)
21
Calculation method for design volume
ADDITIONAL INFORMATION
�Please use this space to provide any additional information about the
22
drainage a rea(s)
Other BUA includes various process equipment.

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .2003 _
Is project below density thresholds set forth in the applicable slormwater rule?
Yes
1
2
Does project maximize dispersed flow and minimize channelizalion of How?
Yes
3
Has the use of piping been minimized per .1003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
31
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
2.77
6
Are curb outlet swales proposed?
No
7
1 Maximum longitudinal slope of curb outlet swale(s) (°k)
NIA
8
Bottom width of curb outlet swale(s) (feet)
N/A
9
Maximum side slope of curb outlet swale(s) (H:V)
NIA
10
Minimum length of curb outlet swale(s) (feet)
N1A
11
Are treatment swales used instead of curb outlet swales?
No
12
Is storruwater released at the edge of the setback as dispersed How?
Yes
13
Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
JAre variations to rule .1003 proposed?
No
ADDITIONAL
INFORMATION
15
Please use this space to provide any additional information about this low density project:
Swale
#
Drainage
Area
Pervious
Bl1A Q
(ac) area C (cfs)
Slope
(%)
V,ii— V_W, Flow depth
lips) (fps) (ft)
1
0.13
0.07
0.06
0.62
0.52
4.00
2.77
0.25
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