SW4231202_Supplement-EZ Form_20240408

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
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SEAL _ Signature of Designer
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DRAINAGE AREAS
I 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
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
1DRAINAGE AREA INFORMATION Entire Site 1 1 2
4 Type of SCM Wet Pond#1 Wet Pond#2
5 Total drainage area(sq ft) 494,810 219,121 275,689
6 Onsite drainage area(sq ft) I 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) 159618 sf 71212 sf 88406 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 102135 sf I 51405 sf 50730 sf
11 Offsite BUA(sq ft) 3421 sf 832 sf 2589 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) I 6605 sf 3330 sf 3275 sf
-Sidewalk(sq ft) 13700 sf 7238 sf 6462 sf
-Roof(sq ft) N/A N/A N/A
-Roadway(sq ft) 81830 sf 40837 sf 40993 sf
-Future(sq ft) N/A N/A N/A
-Other,please specify in the comment box I
below(sq ft) N/A I 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
14 subdivided lots(sq ft) N/A 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) _ II N/A N/A N/A
17 Existing BUA that will be removed(sq ft) N/A N/A N/A
Percent BUA 53.56% 56.33% 51.40%
19 Design storm(inches) N/A 1.0 in 1.0 in
20 Design volume of SCM(cu ft) N/A 10300 cf 11903 cf
21 Calculation method for design volume N/A _ Simple Method Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

WET POND
1 Drainage area number 1 2
2 Minimum required treatment volume(cu ft) I 10300 cf I 11903 cf
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
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 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
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 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) 6,480 SF 5,911 SF
27 Volume of the main permanent pool(cubic feet) 22209 cf 17327 cf
28 Average depth of the main pool(feet) 3.83 ft 3.29 ft
29 Average depth equation used Equation 3 Equation 3
30 If using equation 3,main pool perimeter(feet) 250.0 ft 243.0 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) 4154 cf 3309 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
Does the orifice drawdown from below the top surface of the
48 permanent pool? No No
Does the pond minimize impacts to the receiving channel from the 1-
49 yr,24-hr storm? Yes Yes
Are fountains proposed?(If Y,please provide documentation that
50 MDC(9)is met.) No No
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. 8:01 AM 4/8/2024