SW4231202_Supplement-EZ Form_20240404

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name The Townes at Bermuda Run-Phase 1 _
2 Project Area(ac) 21.60
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 1.92 _
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? Yes
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 2
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
23 StormFilter
24 Silva Cell
25 Bayfilter
26 Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title: Clark A.Fleming,P.E.
28 Organization: Evans Engineering,Inc.
29 Street address: 4609 Dundas Drive
30 City,State,Zip: Greensboro,NC 27407
31 Phone number(s): 336-854-8877
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
011
SEAL • Signature of Designer
• 035014 -
•
•
z
'II/moo Date

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 2
3 Does this project have low density areas? No
1 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 J Entire Site 1 2
4 Type of SCM Wet Pond#1 Wet Pond#2
5 Total drainage area(sq ft) 494,806 219,121 275,685
6 Onsite drainage area(sq ft) 491,389 218,289 273,100
7 Offsite drainage area(sq ft) 3,421 832 2,589
8 Total BUA in project(sq ft) 265174 sf 123449 sf 141725 sf
New BUA on subdivided lots(subject to permitting)
9 (sq ft) 159590 sf 71198 sf 88392 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 102163 sf 51419 sf 50744 sf
11 Offsite BUA(sq ft) 3421 sf 832 sf 2589 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 6605 sf 3330 sf 3275 sf
1 -Sidewalk(sq ft) 13700 sf 7238 sf 6462 sf
-Roof(sq ft) N/A I N/A N/A
-Roadway(sq ft) 81858 sf 40851 sf 41007 sf
-Future(sq ft) N/A N/A N/A
-Other,please specify in the comment box
below(sq ft) N/A N/A N/A
New infiltrating permeable pavement on
13 subdivided lots(sq ft) N/A N/A N/A
New infiltrating permeable pavement not on j
14 subdivided lots(sq ft) N/A I N/A N/A
Existing BUA that will remain(not subject to
15 permitting)(sq ft) N/A N/A N/A
16 Existing BUA that is already permitted(sq ft)iml
N/A N/A N/A
17 Existing BUA that will be removed(sq ft) I N/A N/A N/A
18 Percent BUA 53.56% 1 56.33% 51.40%
19 Design storm(inches) N/A f 1.0 in 1.0 in
20 Design volume of SCM(cu ft) N/A 10300 cf 11903 cf
1 21 Calculation method for design volume N/A II Simple Method Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
I

WET POND
1 Drainage area number 1 2
2 Minimum required treatment volume(cu ft) 10300 cf I 11903 cf 1
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes
4 Is the SCM located away from contaminated soils? Yes Yes
5 What are the side slopes of the SCM(H:V)? 3:1 3:1
Does the SCM have retaining walls,gabion walls or other engineered
6 side slopes? No No
Are the inlets,outlets,and receiving stream protected from erosion
7 Yes Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the No No
design volume?
9 What is the method for dewatering the SCM for maintenance? Pump(preferred) Pump(preferred)
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)? Yes Yes
If the SCM is on a single family lot,does(will?)the plat comply with
13 General MDC(10)? N/A N/A
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 I
17 Was the SCM designed by an NC licensed professional? Yes Yes
WET POND MDC FROM 02H.1053
18 Sizing method used SA/DA SA/DA
19 Has a stage/storage table been provided in the calculations? Yes Yes
20 Elevation of the excavated main pool depth(bottom of sediment 739.00 722.00
removal)(fmsl)
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 739.50 722.50
22 Elevation of the bottom of the vegetated shelf(fmsl) 744.50 726.50
23 Elevation of the permanent pool(fmsl) 745.00 727.00
24 Elevation of the top of the vegetated shelf(fmsl) 745.50 727.50
25 Elevation of the temporary pool(fmsl) 747.50 730.00
26 Surface area of the main permanent pool(square feet) 6,197 SF 5,781 SF
27 Volume of the main permanent pool(cubic feet) 21051 cf 16803 cf
28 Average depth of the main pool(feet) 3.80 ft 3.27 ft
29 Average depth equation used Equation 3 Equation 3
30 If using equation 3,main pool perimeter(feet) 242.0 ft 240.0 ft
31 If using equation 3,width of submerged veg.shelf(feet) 3.0 ft 3.0 ft
32 Volume of the forebay(cubic feet) 4926 cf 3627 cf
33 Is this 15-20%of the volume in the main pool? Yes Yes
34 Clean-out depth for forebay(inches) 42 in. 42 in.
35 Design volume of SCM(cu ft) 26709 cf 29650 cf
36 Is the outlet an orifice or a weir? Orifice Orifice
37 If orifice,orifice diameter(inches) 1.75 in. 1.75 in.
38 If weir,weir height(inches) N/A N/A
39 If weir,weir length(inches) N/A N/A
40 Drawdown time for the temporary pool(days) 4.12 4.19
Are the inlet(s)and outlet located in a manner that avoids short-
41 circuiting? Yes Yes
42 Are berms or baffles provided to improve the flow path? No No
43 Depth of forebay at entrance(inches) 48 in 48 in _
44 Depth of forebay at exit(inches) 36 in 36 in
45 Does water flow out of the forebay in a non-erosive manner? Yes Yes
46 Width of the vegetated shelf(feet) 6 ft 6 ft
47 Slope of vegetated shelf(H:V) 6:1 6:1
48 Does the orifice drawdown from below the top surface of the No No
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes
yr,24-hr storm?
50 Are fountains proposed?(If Y,please provide documentation that No No
MDC(9)is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes
53 Species of turf that will be used on the dam and embankment Fescue Fescue
54 Has a planting plan been provided for the vegetated shelf? Yes Yes `
ADDITIONAL INFORMATION
55 Please use this space to provide any additional information about the
wet pond(s):
Wet Pond 1 12:55 PM 4/4/2024