SW3190505_SIGNED SUPPLEMENT_9/24/2019

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
COURTYARDS ON LAWYERS ROAD
2 Project Area (ac)
50.337
3 {Coastal Wetland Area (ac) _
4 !Surface Water Area (ac) _
0
1.041
5 GIs this protect High or Low Density?
6 Does this project use an off site SCM?
High
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided (feet)
100
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1003(4)(c-d) out of the setback?
Yes
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMS:
11
Infiltration System
0
12
Bioretention Cell
0
13
_
Wet Pond
2
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
0
17
Rainwater Harvesting RWH)
0
18
Green Roof
0
19
Level Spreader -Filter Strip (LS-FS) __
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22
Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Ba filter
0
26 1
Filterra
0
FORMS LOADED
12DESIGNER CERTIFICATION
27 Name and Title: VINCENT G. KEENE, PE
29 IStreet address:
30 ICitv, State, Ziq:
32 JEmail:
PO BOX 1198
PINEVILLE, NC, 28134
WH.COM
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.
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WET POND
1'Drainage area number
1
2
2Design volume of SCM (cu ft)
GENERAL MDC FROM 02H .1050
3 Is the SCM sized to treat the SW from all surfaces at build -out?
124277 of
43037 cf
Yes Yes
4
Is the SCM located away from contaminated soils?
What are the side slopes of the SCM (H:V)?
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
Yes
Yes
5
3:1
3:1
6
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
Yes
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
General MDC (10)?
Yes
Yes
14
r15
Is there an O&M Agreement that complies with General MDC (11)?
Yes
Yes
Is there an O&M Plan that complies with General MDC (12)?
Yes
Yes
161
Does the SCM follow the device specific MDC?
Yes
Yes
_ 17 Was the SCM designed by an NC licensed professional?
WET POND MDC FROM 02H .1053
18 Method used
Yes
SA/DA
Yes
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
removal) (fmsl)
651.50
648.00
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
652.50
649.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
660.00
662.00
23
Elevation of the permanent pool (fmsl)
660.50
662.50
24
Elevation of the top of the vegetated shelf (fmsl)
661.00
663.00
25
Elevation of the temporary pool (fmsl)
667.97
669.87
26
Surface area of the main permanent pool (square feet)
21500
7600
27
Volume of the main permanent pool (cubic feet)
115025 of
47925 of
28
Average depth of the main pool (feet)
6.08 ft
7.12 ft
29
Average depth equation used
Equation 3
Equation 3
301
If using equation 3, main pool perimeter (feet)
610.0 ft
336.0 ft
311
If using equation 3, width of submerged veg. shelf (feet)
5.0 ft
3.0 ft
32
Volume of the forebay (cubic feet)
22175 of
7350 of
33
Is this 15-20% of the volume in the main pool?
Yes
Yes
34
Clean -out depth for forebay (inches)
33 in
39 in
35
Design volume of SCM (cu ft)
124277 of
43037 of
36
Is the outlet an orifice or a weir?
Orifice
Orifice
37
If orifice, orifice diameter (inches)
18 in
24 in
38
If weir, weir height (inches)
39
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
2
2
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
Yes
42
Are berms or baffles provided to improve the flow path?
No
No
43
Depth of forebay at entrance (inches)
86 in
98 in
44
Depth of forebay at exit (inches)
66 in
78 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
Yes
46
Width of the vegetated shelf (feet)
loft
6 ft
47
Slope of vegetated shelf (H: V)
10:1
6:1
48
Does the orifice drawdown from below the top surface of the
permanent pool?
Yes
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 24-hr storm?
Yes
Yes
50
Are fountains proposed? (If Y, please provide documentation that
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?
- --
53,Species of turf that will be used on the dam and embankment
54; Hasa planting plan been provided for the vegetated shelf?
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
55 wet pond(s):
Yes
Yes
BERMUDA
BERMUDA
Yes Yes
Wet Pond 1 6:57 AM 8/28/2019