HomeMy WebLinkAboutSW1221002_Supplement-EZ Form_20230928 SUPPLEMENT-EZ COVER PAGE
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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 1Width 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 I 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 2
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: nathan.hudgens@greshamsith.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.
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 3
3 Does this project have low density areas? No
4 If so, number of low density drainage areas 0
5 versions? No
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DRAINAGE AREA INFORMATION "PmEntire Site 1 2 3
Dry Detention Pond
4 Type of SCM 1 Swale 3 Swale 4
5 Total drainage area (sq ft) 1885521 243790 57250 46475
6 Onsite drainage area (sq ft) 1885521 243790 57250 46475
7 Offsite drainage area(sq ft) 0 0 0 0
8 Total BUA in project(sq ft) 1493266 sf 215541 sf 11900 sf 36850 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) N/A N/A N/A N/A
New BUA not on subdivided lots(subject to
10 permitting)(sf) 15336 sf 33842 sf N/A 36850 sf
11 Offsite BUA(sq ft) N/A N/A N/A N/A
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) - - - 33250 sf
-Sidewalk(sq ft) - - - -
-Roof(sq ft) 15336 sf 22463 sf - -
-Roadway(sq ft) - 1299 sf - -
-Future(sq ft) N/A - - -
-Other, please specify in the comment box
below(sq ft) - 10080 sf - 3600 sf
New infiltrating permeable pavement on
13 subdivided lots(sq ft) N/A N/A N/A N/A
New infiltrating permeable pavement not on
14 subdivided lots(sq ft) N/A N/A N/A N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 1339930 sf 181699 sf 11900 sf -
16 Existing BUA that is already permitted(sq ft) N/A N/A N/A N/A
17 Existing BUA that will be removed(sq ft) - - - 28075 sf
18 Percent BUA 28% 55% 21% 79%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in
20 Design volume of SCM (cu ft) 19394 cf 84 cf 131 cf
21 Calculation method for design volume Simple Method Rational Rational
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Dry detention pond 1: 10,080 sf of impervious area added on the airside of the
airport is routed to the dry detention pond. Swale 4:concrete surface between
retaining walls
TREATMENT SWALE
1 Drainage area number 3 4
2 Desi n flow rate of SCM cfs .40 cfs .60 cfs
GENERAL MDC FROM 02H .1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes YeG
4 Is the SCM located away from contaminated soils? Yes Yes
5 What are the side slopes of the SCM (H:V)? 4:1 3:1
6 Does the SCM have retaining walls, gabion walls or other No No
engineered side slopes?
7 Are the inlets, outlets, and receiving stream protected from erosion Yes Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Other Other
10 If applicable, will the SCM be cleaned out after construction? Yes Yes
11 Does the maintenance access comply with General MDC (8)? Yes Yes
12 Does the drainage easement comply with General MDC (9)? N/A N/A
13 If the SCM is on a single family lot, does (will?)the plat comply with N/A N/A
_ General MDC (10)?
14 Is there an O&M Agreement that complies with General MDC (11)? Yes Yes
15 Is there an O&M Plan that complies with General MDC (12)? Yes Yes
16 Does the SCM follow the device specific MDC? Yes Yes
17 Was the SCM desi ned b an NC licensed rofessional? Yes Yes
TREATMENT SWALE MDC FROM 02H .1061
18 SHWT elevation (fmsl) 2103 2087
19 Bottom of the treatment swale (fmsl) 2104.00 2103.00
20 Depth of treatment swale (feet) 1 cf 1 cf
21 Is the swale trapezoidal in shape? Yes Yes
22 Width of bottom of swale (feet) 1 ft 1 ft
23 Side slopes of treatment swale (H:V) 4:1 3:1
24 Length of swale (feet) 300 ft 85 ft
25 Flow depth during the 0.75 inch/hour storm (inches) 1 in 1 in
26 Flow velocity during the 0.75 inch/hour storm (feet per second) 2 cfs 2 cfs
27 Hydraulic retention time for swale (minutes) 4 min 4 min
28 Species of grass that will be used Tall Fescue Tall Fescue
29 Will the grass be maintained at an average height of 6 inches? Yes Yes
30 Will the grass not be cut lower than 4 inches? No No
31 Velocity during the 10-year storm (feet per second) 3 ft/s 3 ft/s
32 Is the swale desi ned to non-erosive) ass the 10- ear storm? Yes Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
33 treatment swale(s):
TrSwale 1 9:44 AM 9/20/2023
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? 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 No
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) 2102.55
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 9:38 AM 9/21/2023