SW1221002_Supplement-EZ Form_20230223

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Proiect Area fac)
)astal Wetland Area (ac)
irface Water Area (ac)
this project High or Low Density?
)es this project use an off -site SCM?
Greater Asheville Regional Airport Terminal Modernization
6.89
R
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided (feet)
30
8
Will the vegetated setback remain vegetated?
N/A
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 this project?
No
NUMBER AND TYPE OF SCMs:
11
linfiltration System
12
Bioretention Cell
1
13
Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting (RWH)
18
JGreen Roof
19
Level Spreader -Filter Strip (LS-FS)
20
Disconnected Impervious Surface (DIS)
21
Treatment Swale
22
Dry Pond
23
StormFilter
24
Silva Cell
25
Bayfilter
26
IFilterra
FORMS LOADED
DESIGNER TIFICATION
27
Name and Title:
Nathan Hudgens, PE
28
Organization:
Gresham Smith
29
Street address:
222 2nd Ave S, STE 1400
30
City, State, Zip:
Nashville, TN 37201
31
Phone number(s):
615-770-8155
32
Email:
[e-mail]
Certification Statement:
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.
Seal
Signa urref Designer
02/20/2023
Date

DRAINAGE AREAS
1
Ils this a high density project?
Yes
2
If so, number of drainage areas/SCMs
1
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
4
Type of SCM
Bioretention Pond
5
Total drainage area (sq ft)
300154
169222
6
Onsite drainage area (sq ft)
300154
169222
7
Offsite drainage area (sq ft)
0
0
8
Total BUA in project (sq ft)
227221 sf
141167 sf
9
New BUA on subdivided lots (subject to
permitting) (sq ft)
N/A
N/A
10
New BUA not on subdivided lots (subject to
permitting) (sf)
227221 sf
141167 sf
11
Offsite BUA (sq ft)
N/A
N/A
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft)
22073 sf
15502 sf
Sidewalk (sq ft)
26625 sf
15899 sf
Roof (sq ft)
69790 sf
52088 sf
Roadway (sq ft)
66700 sf
15645 sf
Future (sq ft)
N/A
N/A
Other, please specify in the comment box
below (sq ft)
42033 sf
42033 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft)
N/A
N/A
14
New infiltrating permeable pavement not on
Isubdivided lots (sq ft)
N/A
N/A
15
Existing BUA that will remain (not subject to
permitting) (sq ft)
16
Existing BUA that is already permitted (sq ft)
17
Existing BUA that will be removed (sq ft)
205465 sf
18
Percent BUA
76%
19
Design storm (inches)
2.2 in
20
1 Design volume of SCM (cu ft)
1204 cf
21
ICalculation method or design volume
Volume Mate ing
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
42,033 sf of impervious area added on the airside of the airport is routed to
the bioretention pond and included in the site total area to account for
physical limitations of routing all impervious area at the north side of the
terminal to a primary SCM.

BIORETENTION CELL
1
jDrainage area number
1 1 (1-5 and 1-6)
2
IMinimum required treatment volume cu ft
c
GENERAL
MDC FROM 02H .1050
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)?
3:1
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes?
Yes
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
9
What is the method for dewatering the SCM for maintenance?
Pump (preferred)
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 device specific MDC?
Yes
17
Was the SCM designedy an NG licensedpro essiona .
es
BIORETENTION
CELL MDC FROM 02H .1052
18
SHWT elevation ms
2102.30
19
Bottom of the bioretention cell (fmsl)
2123.75
20
Ponding depth of the design storm (inches)
12 in
21
Surface area of the bioretention cell (square feet)
1377 sf
22
Design volume of SCM (cu ft)
1377 cf
23
Is the bioretention cell used for peak attenuation?
No
24
Depth of peak attenuation over planting surface (in)
12 in
25
Height of peak attenuation outlet above the planting surface (in)
12 in
26
Infiltration rate of the in situ soil (inch/hour)
1 in/hr
27
Diameter of the underdrain pipes (if applicable)
6 in
28
Does the design include Internal Water Storage (IWS)?
Yes
29
if so, elevation of the top of the IWS (fmsl)
2126.5
30
Elevation of the planting surface (fmsl)
2128
31
other)?
Trees/Shrubs
32
Media depth (inches)
36 in
33
Percentage of medium to coarse washed sand by volume
80%
34
Percentage of fines (silt and clay) by volume
10%
35
Percentage of organic matter by volume
10%
36
Type of organic material
pine bark fines
37
Phosphorus Index (P-Index) of media (unitless)
30
38
Will compaction be avoided during construction?
Yes
39
Will cell be maintained to a one inch/hour standard?
Yes
40
Depth of mulch, if applicable (inches)
3 in
41
Type of mulch, if applicable
hardwood
42
IHow many clean out pipes are being installed?
1
43
11 ype OT pretreatment tha will be used:
grave
ADDITIONAL
44
INFORMATION
Please use this space to provide any additional information about
the bioretention cell(s):
Bioretention 3 9:46 AM 2/20/2023