SW6230705_Supplement-EZ Form_20240304 (2)

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name _ Serenity Subdivision Ph.3-5
2 Project Area(ac) 163.07
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 1.26
5 Is this project High or Low Density? Both High and Low Density
6 Does this project use an off-site SCM? No
COMPLIANCE WITH 02H.1003(4)
7 Width of vegetated setbacks provided(feet) 100&200
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 5
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: C.Scott Brown, PE
28 Organization: 4D Site Solutions Inc.
29 Street address: 409 Chicago Dr.Ste. 112
30 City,State,Zip: Fayetteville, NC 28306
31 Phone number(s): 910-426-6777
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

WET POND
1 Drainage area number 12 13 14 15 16
2 Minimum required treatment volume(cu ft) 17979 cf I 40362 cf I 26570 cf I 27062 cf F 23670 cf I
GENERAL MDC FROM 02H.1050
3 Is the SCM sized to treat the SW from all surfaces at build-out? Yes Yes Yes Yes Yes
4 Is the SCM located away from contaminated soils? Yes Yes Yes Yes Yes
5 What are the side slopes of the SCM(H:V)? 3:1 3:1 3:1 3:1 3:1
6 Does the SCM have retaining walls,gabion walls or other engineered No No Yes No Yes
side slopes?
7 Are the inlets,outlets,and receiving stream protected from erosion Yes Yes Yes Yes Yes
(10-year storm)?
8 Is there an overflow or bypass for inflow volume in excess of the Yes Yes Yes Yes Yes
design volume?
9 What is the method for dewatering the SCM for maintenance? Pump(preferred) Pump(preferred) Pump(preferred) Pump(preferred) Pump(preferred)
10 If applicable,will the SCM be cleaned out after construction? Yes Yes Yes Yes Yes
11 Does the maintenance access comply with General MDC(8)? Yes Yes Yes Yes Yes
12 Does the drainage easement comply with General MDC(9)? Yes Yes Yes Yes Yes
13 If the SCM is on a single family lot,does(will?)the plat comply with N/A N/A N/A N/A N/A
General MDC(10)?
14 Is there an O&M Agreement that complies with General MDC(11)? Yes Yes Yes Yes Yes
15 Is there an O&M Plan that complies with General MDC(12)? Yes Yes Yes Yes Yes
16 Does the SCM follow the device specific MDC? Yes Yes Yes Yes Yes
17 Was the SCM designed by an NC licensed professional? Yes Yes Yes Yes Yes
WET POND MDC FROM 02H.1053 _
18 Sizing method used SA/DA SA/DA SA/DA SA/DA SA/DA
19 Has a stage/storage table been provided in the calculations? Yes Yes Yes Yes Yes
20 Elevation of the excavated main pool depth(bottom of sediment 306.50 301.50 297.50 290.50 273.50
removal)(fmsl)
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 307.00 302.00 298.00 291.00 274.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 312.00 307.00 302.50 295.00 279.00
23 Elevation of the permanent pool(fmsl) - 312.50 307.50 303.00 295.50 279.50
24 Elevation of the top of the vegetated shelf(fmsl) 313.00 308.00 303.50 296.00 280.00
25 Elevation of the temporary pool(fmsl) 313.86 309.42 304.82 296.79 281.02
26 Surface area of the main permanent pool(square feet) 9633 16644 10658 16831 12144
27 Volume of the main permanent pool(cubic feet) 34387 cf 68687 cf 41003 cf 61958 cf 51599 cf
28 Average depth of the main pool(feet) 3.60 ft 4.10 ft 3.90 ft 3.50 ft 4.20 ft
29 Average depth equation used Equation 2 Equation 2 Equation 2 Equation 2 Equation 2
30 If using equation 3,main pool perimeter(feet)
31 If using equation 3,width of submerged veg.shelf(feet)
32 Volume of the forebay(cubic feet) 5917 cf 12614 cf 7358 cf _ 9950 cf _ 9538 cf
33 Is this 15-20%of the volume in the main pool? Yes Yes Yes Yes Yes
34 Clean-out depth for forebay(inches) 66 in 66 in 50 in 54 in 66 in
35 Design volume of SCM(cu ft) 19036 cf 46650 cf 28551 cf 28341 cf 25863 cf
36 Is the outlet an orifice or a weir? Orifice Orifice Orifice Orifice Orifice
37 If orifice,orifice diameter(inches) 2 in 3 in 3 in 3 in 3 in
38 If weir,weir height(inches)
39 If weir,weir length(inches)
40 Drawdown time for the temporary pool(days) 2 2.8 2 2.1 2.2
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes Yes Yes Yes
circuiting?
42 Are berms or baffles provided to improve the flow path? No No No No No
43 Depth of forebay at entrance(inches) 89 in 86 in 73 in 78 in 87 in
44 Depth of forebay at exit(inches) 73 in 74 in 67 in 61 in 73 in
45 Does water flow out of the forebay in a non-erosive manner? Yes Yes Yes Yes Yes
46 Width of the vegetated shelf(feet) 6 ft 6 ft 6 ft 6 ft 6 ft
47 Slope of vegetated shelf(H:V) 6:1 6:1 6:1 6:1 6:1
48 Does the orifice drawdown from below the top surface of the Yes Yes Yes Yes Yes
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes Yes Yes Yes
yr,24-hr storm?
50 Are fountains proposed?(If Y,please provide documentation that No No No No No
MDC(9)is met.)
51 Is a trash rack or other device provided to protect the outlet system? Yes Yes Yes Yes Yes
52 Are the dam and embankment planted in non-clumping turf grass? Yes Yes Yes Yes Yes
53 Species of turf that will be used on the dam and embankment _ centipede centipede _ centipede centipede centipede
54 Has a planting plan been provided for the vegetated shelf? Yes Yes Yes Yes Yes
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
55 wet pond(s):
SCM 12,14&16 orifice sizes:2.4",2.8"&2.7"
Wet Pond 2 10:21 AM 2/8/2024

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 5
3 Does this project have low density areas? Yes
4 If so,number of low density drainage areas 1
Is all/part of this project subject to previous rule
( 5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1 2 3 4
4 'Type of SCM Wet Pond Wet Pond 12 Wet Pond 13 Wet Pond 14 Wet Pond 15
5 Total drainage area(sq ft) 7103334 450039 978807 658114 703037
6 Onsite drainage area(sq ft) 7047417 427950 950020 653073 703037
7 Offsite drainage area(sq ft) 55917 22089 28787 5041 0
8 Total BUA in project(sq ft) 1669425 sf 214713 sf 483779 sf 317703 sf 321768 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 951012 sf 120792 sf 264900 sf 186180 sf 202900 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) _ 662496 sf 71832 sf 190092 sf 126482 sf 118868 sf
11 Offsite BUA(sq ft) _ 55917 sf 22089 sf 28787 sf 5041 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft)
-Sidewalk(sq ft) 129319 sf 13086 sf 35254 sf 26443 sf 23771 sf
-Roof(sq ft)
-Roadway(sq ft) 417613 sf 46238 sf 117534 sf 81843 sf 75097 sf
-Future(sq ft) 20000 sf 20000 sf
-Other,please specify in the comment box
below(sq ft) 90581 sf 12508 sf 17304 sf 18196 sf 20000 sf
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) _
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 23% 48% 49% 48% 46%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 19036 cf 46650 cf 28499 cf 28341 cf
21 Calculation method for design volume Simple Simple Simple Simple
ADDITIONAL INFORMATION Mil
Please use this space to provide any additional information about the
22 drainage area(s):
Other impervious listed is for the surface water of the pond.

DRAINAGE AREAS
1 Is this a high density project? Yes
2 If so,number of drainage areas/SCMs 5
3 Does this project have low density areas? Yes
4 If so,number of low density drainage areas 1
Is all/part of this project subject to previous rule
( 5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 5 LD 1
4 'Type of SCM Wet Pond Wet Pond 16
5 Total drainage area(sq ft) 7103334 548797 3764540
6 Onsite drainage area(sq ft) 7047417 548797 3764540
7 Offsite drainage area(sq ft) 55917 0
8 Total BUA in project(sq ft) 1669425 sf 285107 sf 46355 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 951012 sf 163840 sf 12400 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) _ 662496 sf 121267 sf 33955 sf
11 Offsite BUA(sq ft) _ 55917 sf
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) 4983 sf
-Sidewalk(sq ft) 129319 sf 24372 sf 6393 sf
-Roof(sq ft)
-Roadway(sq ft) 417613 sf 74322 sf 22579 sf
-Future(sq ft) 20000 sf
-Other,please specify in the comment box
below(sq ft) 90581 sf 22573 sf
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)
16 Existing BUA that is already permitted(sq ft)
17 Existing BUA that will be removed(sq ft)
18 Percent BUA 23% 52% 1%
19 Design storm(inches) 1.0 in
20 Design volume of SCM(cu ft) 25856 cf
21 Calculation method for design volume Simple
ADDITIONAL INFORMATION Mil
Please use this space to provide any additional information about the
22 drainage area(s):
Other impervious listed is for the surface water of the pond.

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H.1003
1 Is project below density thresholds set forth in the applicable stormwater rule? Yes
2 Does project maximize dispersed flow and minimize channelization of flow? Yes
3 Has the use of piping been minimized per.1003(2)(c)? Yes
4 Side slopes of the vegetated conveyances(H:V) 3 sf
5 Maximum velocity in the vegetated conveyances during the 10-year storm? 2.2
6 Are curb outlet swales proposed? Yes
7 Maximum longitudinal slope of curb outlet swale(s)(%) 1%
8 Bottom width of curb outlet swale(s)(feet) 2 ft
9 Maximum side slope of curb outlet swale(s)(H:V) 3:1
10 Minimum length of curb outlet swale(s)(feet) 145 ft
11 Are treatment swales used instead of curb outlet swales? No
12 Is stormwater released at the edge of the setback as dispersed flow? Yes
13 Have stormwater outlets been designed to prevent downslope erosion? Yes
14 Are variations to rule.1003 proposed? No
ADDITIONAL INFORMATION _
15 Please use this space to provide any additional information about this low density project:
Drainage Pervious
Swale BUA Q Slope Vallo„ Vaasa, Flow depth
Area area
act (ac) (ac) C (cfs) (%) (fps) (fps) (ft)
1 1.90 0.79 1.11 0.57 8.11 1.00 4.50 2.20 0.82
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