SW3240401_Supplement-EZ Form_20240430

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Cottage Park
2 ,Project Area(ac) 31.63
3 Coastal Wetland Area(ac) 0
4 Surface Water Area(ac) 0.68
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) NIA
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 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: Mason Greeson,PE Principal
28 Organization: Civil&Environmental Consultants,Inc.
29 Street address: 3701 Arco Corporate Drive,Suite 400
30 City,State,Zip: Charlotte,NC,28273
31 Phone number(s): [phone]
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
Oil I
,%•�, CARrV*,
% S1?AL r• _ Signature of Des I er
043.168•
ON i i I'G1R;;- 6 , 2 2 . 2
Sea! 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
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 2
4 Type of SCM 2 Wet Ponds Wet Pond Wet Pond
5 Total drainage area(sq ft) 1463302 sf 538456 sf 502119 sf
6 Onsite drainage area(sq ft) 1332393 sf 521338 sf 502119 sf
7 Offsite drainage area(sq ft) 130909 sf 17118 sf N/A
8 Total BUA in project(sq ft) 644376 sf 319364 sf 288226 sf
New BUA on subdivided lots(subject to
9 permitting)(sq ft) 315140 sf 131873 sf 150121 sf
New BUA not on subdivided lots(subject to
10 permitting)(sf) 321639 sf 179894 sf 138105 sf
11 Offsite BUA(sq ft) 7597 sf 7597 sf N/A
12 Breakdown of new BUA not on subdivided lots:
-Parking(sq ft) N/A N/A N/A
-Sidewalk(sq ft) _ 71837 sf 42572 sf 25625 sf
Roof(sq ft) _ N/A N/A N/A
-Roadway(sq ft) _ 243047 sf 137322 sf 105725 sf
-Future(sq ft) N/A N/A N/A
-Other,please specify in the comment box
below(sq ft) 6755 sf N/A 6755 sf
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) N/A N/A N/A
17 Existing BUA that will be removed(sq ft) N/A N/A N/A
18 Percent BUA 44% 59% 57%
19 Design storm(inches) 1.0 in 1.0 in 1.0 in
20 Design volume of SCM(cu ft) 280106 cf 140794 cf 139312 cf
21 Calculation method for design volume Simple Method Simple Method Simple Method
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):
Other BUA for undetermined on-site amenities.Amenity site assumed to be
100%impervious for a conservative estimate.

WET POND
_ 1 Drainage area number I 1 I 2 I
2 Minimum required treatment volume(Cu ft) 26201 cf 23675 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
6 Does the SCM have retaining walls,gabion walls or other Yes Yes
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? 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
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 602.50 604.50
removal)(fmsl) .
21 Elevation of the main pool bottom(top of sediment removal)(fmsl) 603.00 605.00
22 Elevation of the bottom of the vegetated shelf(fmsl) 607.50 609.50
23 Elevation of the permanent pool(fmsl) 608.00 610.00
24 Elevation of the top of the vegetated shelf(fmsl) 608.50 610.50
25 Elevation of the temporary pool(fmsl) 618.00 620.00
26 Surface area of the main permanent pool(square feet) 7789 8027
27 Volume of the main permanent pool(cubic feet) 31873 cf 32408 cf
28 Average depth of the main pool(feet) 4.09 ft 4.04 ft
29 Average depth equation used Equation 2 Equation 2
30 If using equation 3,main pool perimeter(feet) N/A N/A
31 If using equation 3,width of submerged veg.shelf(feet) N/A N/A
32 Volume of the forebay(cubic feet) 5867 cf 5132 cf
33 Is this 15-20%of the volume in the main pool? Yes Yes
34 Clean-out depth for forebay(inches) 12 in 12 In
35 Design volume of SCM(cu ft) 140794 cf 139312 cf
36 Is the outlet an orifice or a weir? Orifice Orifice
37 If orifice,orifice diameter(inches) 3 in 3 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) 3.65 3.42
41 Are the inlet(s)and outlet located in a manner that avoids short- Yes Yes
circuiting?
42 Are berms or baffles provided to improve the flow path? Yes Yes
43 Depth of forebay at entrance(inches) 66 in 66 in
44 Depth of forebay at exit(inches) 60 in 60 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 Yes Yes
permanent pool?
49 Does the pond minimize impacts to the receiving channel from the 1- Yes Yes
yr,24-hr storm?
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 Kentucky Blue Kentucky Blue
54 Has a planting plan been provided for the vegetated shelf? No No
ADDITIONAL INFORMATION
Please use this space to provide any additional Information about
55 the wet pond(s):
Wet Pond 3 11:41 AM 4/17/2024