SW3221006_Supplement-EZ Form_20230419

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
ROJECT INFORMATION
1 lProiect Name
3 lCoastal Wetland Area ac
4 Surface Water Area ac
5 Is this Droiect Hiah or Low De
this proiect use an off -site SCM?
at Winaate - Phases 1& 2
N/A
17.43
High
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
25'
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
4
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
1 Dry Pond
23
StormFilter
24
Silva Cell
25
Bayfilter
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
MatthewC. Kirchner, PE
28
Organization:
Eagle Engineering, Inc.
29
Street address:
2013-A Van Buren Ave
30
City, State, Zip:
Indian Trail, NC 28079
31
Phone numbers :
704-882-4222
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.
�H CARO
SEAL
04550 =
\044 l 9/2023
Signature of Designer
04/19/2023
Date

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
4
3
Does this project have low density areas?
No
4
If so, number of low density drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
3
4
4
Type of SCM
Wet Pond
Wet Pond
Wet Pond
Wet Pond
5
Total drainage area (sq ft
1496875
1019236
459674
233461
6
Onsite drainage area (sq ft
1391325
1001463
459674
233461
7
Offsite drainage area (sq ft
105550
17773
0
0
8
Total BUA in project (sq ft
578768 sf
376873 sf
174676 sf
65776 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
378575 sf
272762 sf
121722 sf
45795 sf
10permitting)
New BUA not on subdivided lots (subject to
s
191625 sf
104111 sf
52954 sf
19981 sf
11
Offsite BUA (sq ft
8568 sf
sf
sf
sf
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
19488 sf
0 sf
0 sf
0 sf
-Sidewalk (sft
10849 sf
4455 sf
2318 sf
1535 sf
-Roof (s ft
0 sf
0 sf
Osf
0 sf
- Roadway s ft
- Future (sq ft
-Other, please specify in the comment box
below (sq ft
161288 sf
99656 sf
50636 sf
18446sf
sf
sf
sf
sf
sf
sf
sf
sf
13
New infiltrating permeable pavement on
Isubdivided lots (sq ft
sf
sf
sf
sf
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
sf
sf
sf
sf
15permitting)
Existing BUA that will remain (not subject to
s ft
8568 sf
sf
sf
sf
16
Existing BUA that is already permitted (sq ft
sf
sf
sf
sf
17
Existing BUA that will be removed (sq ft
sf
sf
sf
sf
18
Percent BUA
39%
37%
38%
28%
19
Design storm inches
5.3 in
5.3 in
5.3 in
5.3 in
20
Design volume of SCM cu ft
49853 cf
40299 cf
15167 cf
7785 cf
21
Calculation method for design volume
Simple Method
1 Simple Method
1 Simple Method
1 Simple Method
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

WET POND
F I IDrainage area number
Al I A2 I A3 I B
31
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
3:1
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No
No
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion
10- ear storm)?
Yes
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
desi n volume?
Yes
Yes
Yes
Yes
9
What is the method for dewatering the SCM for maintenance?
Pump (preferred)
Pump (preferred)
Pump (preferred)
Pump (preferred)
10
If applicable, will the SCM be cleaned out after construction?
Yes
Yes
Yes
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
Yes
12
Does the drainage easement comply with General MDC (9)?
Yes
Yes
Yes
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC 10 ?
N/A
N/A
N/A
N/A
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Yes
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
Yes
Yes
161
Does the SCM follow the device specific MDC?
Yes
Yes
Yes
Yes
17
Was the SCM desi ned b an NC licensed professional?
Yes
Yes
Yes
Yes
WFT PONE]
MOC FROM n7H .7 n53
18
Sizing method used
SA/DA
SA/DA
SA/DA
SA/DA
19
Has a stage/storage table been provided in the calculations?
Yes
Yes
Yes
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl
507.00
509.00
525.00
493.00
21
Elevation of the main pool bottom (top of sediment removal) (fmsl)
508.00
510.00
528.00
494.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
512.00
514.00
532.00
498.00
23
Elevation of the permanent pool (fmsl)
512.00
514.00
532.00
498.00
24
Elevation of the top of the vegetated shelf (fmsl)
513.00
515.00
533.00
499.50
25
Elevation of the temporary pool (fmsl)
513.00
515.00
533.00
499.50
26
Surface area of the main permanent pool (square feet)
36137
10853
4067
19046
27
Volume of the main permanent pool (cubic feet)
124658 cf
36061 cf
16283 cf
66925 cf
28
Average depth of the main pool (feet)
3.40 ft
3.30 ft
4 ft
3.50 ft
29
Average depth equation used
Equation 2
Equation 2
Equation 2
Equation 2
30
If using equation 3, main pool perimeter (feet)
N/A
N/A
N/A
N/A
31
If using equation 3, width of submerged veg. shelf (feet)
N/A
N/A
N/A
N/A
32
Volume of the forebay (cubic feet)
20643 cf
6280 cf
2963 cf
12947 cf
33
Is this 15-20% of the volume in the main pool?
Yes
Yes
Yes
Yes
34
Clean -out depth for forebay (inches)
48 in
48 in
36 in
48 in
35
Design volume of SCM (cu ft)
49853 cf
15167 cf
7785 cf
40299 cf
361
Is the outlet an orifice or a weir?
Weir
Weir
Weir
Weir
37
If orifice, orifice diameter (inches)
3.5
2
1.5
3
38
If weir, weir height (inches)
Ifweir, weir length (inches)
Drawdown time for the temporary pool (days)
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
0 in
0 in
0 in
0 in
39
0 in
0 in
0 in
0 in
40
3.36
3.02
2.73
2.92
41
Yes
Yes
Yes
Yes
42
Are berms or baffles provided to improve the flow path?
No
No
No
No
43
Depth of forebay at entrance (inches)
66 in
66 in
54 in
66 in
44
Depth of forebay at exit (inches)
54 in
54 in
42 in
54 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
Yes
Yes
Yes
46
Width of the vegetated shelf (feet)
6 ft
6 ft
6 ft
6 ft
47
Slope of vegetated shelf (H:V)
6:1
6:1
6:1
6:1
48
Does the orifice drawdown from below the top surface of the
ermanentpool?
Does the pond minimize impacts to the receiving channel from the 1-
r, 24-hr storm?
Yes
Yes
Yes
Yes
49
Yes
Yes
Yes
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC 9 is met.
No
No
No
No
51
Is a trash rack or other device provided to protect the outlet system?
Yes
Yes
Yes
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
Yes
Yes
Yes
53
Species of turf that will be used on the dam and embankment
Centipede Grass
Centipede Grass
Centipede Grass
Centipede Grass
54
Hasa planting plan been provided for the vegetated shelf?
Yes
Yes
Yes
Yes
Wet Pond 3 1:48 PM 11/22/2022