SW1221002_Supplement-EZ Form_20230804

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED I
PROJECT INFORMATION
1 Project Name Greater Asheville Regional Airport Terminal Modernization
2 Project Area(ac) 43.29
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0
5 Is this project High or Low Density? High
6 Does this project use an off-site SCM? No
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 Infiltration System
12 Bioretention Cell
13 Wet Pond
14 Stormwater Wetland
15 Permeable Pavement
16 Sand Filter
17 Rainwater Harvesting(RWH)
18 Green Roof
19 Level Spreader-Filter Strip(LS-FS)
20 Disconnected Impervious Surface(DIS)
21 Treatment Swale
22 Dry Pond 1
23 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
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:
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.
Designer
7-17‘
SEAL v•• = Signature of Designer
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Seal Date

DRAINAGE AREAS
1 Is 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
Is all/part of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
Dry Detention Pond
4 Type of SCM 1
5 Total drainage area (sq ft) 1885521 243790
6 Onsite drainage area (sq ft) 1885521 243790
7 Offsite drainage area (sq ft) 0 0
8 Total BUA in project (sq ft) 1493266 sf 215541 sf
New BUA on subdivided lots (subject to permitting)
9 (sq ft) N/A N/A
New BUA not on subdivided lots (subject to
10 permitting) (sf)
11 Offsite BUA (sq ft) N/A N/A
12 Breakdown of new BUA not on subdivided lots:
- Parking (sq ft) 66637 sf 15502 sf
- Sidewalk (sq ft) 26625 sf 15899 sf
I - Roof(sq ft) 175456 sf 126462 sf
- Roadway(sq ft) 71727 sf 15645 sf
- Future (sq ft) N/A N/A
- Other, please specify in the comment box
below (sq ft) 1152821 sf 42033 sf
New infiltrating permeable pavement on
13 subdivided lots (sq ft) N/A N/A
New infiltrating permeable pavement not on
14 subdivided lots (sq ft) N/A N/A
Existing BUA that will remain (not subject to
15 permitting) (sq ft)
16 Existing BUA that is already permitted (sq ft)
17 Existing BUA that will be removed (sq ft) 391479 sf
18 Percent BUA 79% 88%
19 Design storm (inches) 2.2 in _
20 Design volume of SCM (cu ft) 19394 cf
Simple Method for
21 Calculation method for design volume Runoff Volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
1,152,821sf of impervious area includes airside general pavement for
maintenance, access, and airplane taxiways. 42,033 sf of impervious area
added on the airside of the airport is routed to the dry detention pond.

DRY POND
1 Drainage area number 1-3& 1-4
2 Minimum required treatment volume (cu ft) 17597 cf
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? No
4 Is the SCM located away from contaminated soils? Yes
5 What are the side slopes of the SCM (H:V)? 3:1
Does the SCM have retaining walls, gabion walls or other
6 No
engineered side slopes?
7 Are the inlets, outlets, and receiving stream protected from erosion Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Drawdown Orifice
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)? N/A
13 If the SCM is on a single family lot, does (will?)the plat comply with N/A
General MDC (10)?
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 designed by an NC licensed professional? Yes
DRY POND MDC FROM 02H.1062
18 SHWT elevation (fmsl) 2095.35
19 Elevation of the bottom of the dry pond (fmsl) 2114.1
20 Distance from bottom to SHWT (feet) 13 ft
21 Elevation of the temporary pool during the design storm (feet) 2120 ft
22 Ponding depth of the design storm (feet) 6 ft
23 Will the dry pond be uniformly graded to flow toward the outlet? Yes
24 Is a low flow channel being provided? No
25 Are the inlet(s) and outlet located in a manner that avoids short- Yes
circuiting?
26 Will berms or baffles be provided to increase the flow path? No
27 What method of pretreatment will be provided? Forebay
28 Design volume of SCM (cu ft) 19394
29 Diameter of drawdown orifice (in) _ 2 in
30 Drawdown time for the temporary pool (hours) 40
31 Does the pond minimize impacts to the receiving channel from the 1- Yes
yr, 24-hr storm?
32 Is there a small permanent pool near the orifice to prevent clogging? No
33 Will the outlet be designed to prevent clogging? Yes
34 Are the dam and embankment planted in non-clumping turf grass? Yes
35 Species of turf that will be used on the dam and embankment KY Fescue at 5
Ibs/1,000sf
36 Will trees and shrubs be prevented from growing on the dam and Yes
embankment? _
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
37 dry pond(s):
Dry Pond 1 6:13 PM 8/2/2023