SW1230601_Supplement-EZ Form_20240213

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name i South Parking Area
2 Project Area(ac) 10.79
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.18
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? No
9 If BUA is proposed in the setback,does it meet NCAC 02H.1003(4)(c-d)? Yes
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: Dave Skurky,Chief Stormwater Engineer
28 Organization: Aulick Engineering,LLC
29 Street address: 600 Park Offices Dr.
30 City,State,Zip: Durham,NC,27709
31 Phone number(s): 919-819-4242
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
Signature of Designer
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
4 Type of SCM Dry Pond
5 Total drainage area(sq ft) 470012 296375
6 Onsite drainage area(sq ft) 470012 296375
7 Offsite drainage area(sq ft) 0
8 Total BUA in project(sq ft) 264145 sf 264145 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft)
New BUA not on subdivided lots(subject to
10 permitting)(sf) 238734 sf 238734 sf
11 Offsite BUA(sq ft)
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 152552 sf 152552 sf
-Sidewalk(sq ft) 4043 sf 4043 sf
-Roof(sq ft)
-Roadway(sq ft) 82139 sf 82139 sf
-Future(sq ft)
-Other,please specify in the comment box
below(sq ft)
New infiltrating permeable pavement on
13 subdivided lots(sq ft)
New infiltrating permeable pavement not on
14 subdivided lots(sq ft)
Existing BUA that will remain(not subject to
15 permitting)(sq ft) 25411 sf 25411 sf
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 56.2% 89%
19 Design storm(inches) 1.0 in
20 Design volume of SCM(cu ft) 19140 cf
21 Calculation method for design volume Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
This project is within Asheville Regional Airport property,which has a property
area of 900ac.For the purposes of our calculations,the limits of our
construction minus the surface waters on-site, 10.79 acres,was used when
determining built upon area values.

DRY POND
1 Drainage area number 1
2 Minimum required treatment volume(cu ft) 19140 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?
Are the inlets,outlets,and receiving stream protected from erosion
7 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)? Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with No
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 desi ned b an NC licensed rofessional? Yes
DRY POND MDC FROM 02H.1062
18 SHWT elevation(fmsl) 2079.3
19 Elevation of the bottom of the dry pond(fmsl) 2080.5
20 Distance from bottom to SHWT(feet) 1.2ft
21 Elevation of the temporary pool during the design storm(feet) 2084.5 ft
22 Ponding depth of the design storm(feet) 4.0 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) 27,195
29 Diameter of drawdown orifice(in) 2.5 in
30 Drawdown time for the temporary pool(hours) 40
Does the pond minimize impacts to the receiving channel from the 1-
31 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 Fescue
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):
There is no permanent pool proposed in the SCM,this is acceptable per Part
E-4 of the Manual.
Dry Pond 3 9:22 AM 2/12/2024