SW1191201_Supplement-EZ Form_20200518

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DJECT INFORMATION
1
Project Name
NCNG Morganton Regional Readiness Center
2
Project Area ac
34.4
3
Coastal Wetland Area ac
0
4
Surface Water Area ac
0.6
5
Is this ro'ect High or Low Density?
Hiph
3
Does this project use an off -site SCM?
No
MFLIANCE WITH 02H .10U 4j
7
Width of vegetated setbacks provided feet
50
3
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1 0034 c-d out of the setback?
No
j
Is streambank stabilization proposed on this project?
No
MBER AND TYPE OF SCMs:
1
Infiltration System
0
2
Bioretention Cell
0
3
Wet Pond
1
4
Stormwater Wetland
0
5
Permeable Pavement
0
5
Sand Filter
0
7
Rainwater Harvesting RWH
0
3
Green Roof
0
9f
Level Spreader -Filter Strip (IS-FS
0
}
Disconnected Impervious Surface (DIS)
0
1
Treatment Swale
0
2
Dry Pond
0
3
StormFilter
0
4
Silva Cell
0
5
Bayfilter
0
0
5 J
Filterra
FORMS LOADED
31GNER CERTIFICATION
7 Name and Title:
Frank Slinsk P.E. Senior Project Manager
3 Organization:
Timmons Group
a Street address:
5410 Trani Road Suite 102
3 City, State, Zip:
Raleigh, NC 27607
1 Phone numbers : _
Z Email:
919 866-4505
frank.slinsk @timmons.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.
\'�tA CAR'
j1ill,
.q SEAL r; f
: 033612
Signatud of Designer
Date
/rg 12-02- 0

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
1
3
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
4
Type of SCM
Wet Pond
5
Total BUA in project (sq ft
700010 sf
570010 sf
6permitting)
New BUA on subdivided lots (subject to
s ft
7permitting)
New BUA outside of subdivided lots (subject to
sf
700010 sf
570010 sf
8
Offsite - total area (sq ft
9
Offsite BUA (sq ft
10
Breakdown of new BUA outside subdivided lots:
- Parking (sq ft
530612 sf
465306 sf
- Sidewalk (sq ft
33389 sf
33389 sf
- Roof (sq ft
64267 sf
64267 sf
- Roadway s ft
10194 sf
- Future (sq ft
61548 sf
7048 sf
- Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots (sq ft
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft
13permitting)
Exisitng BUA that will remain (not subject to
s ft
14
lExistina BUA that is already permitted (sq ft
15
Existing BUA that will be removed (sq ft
16
Percent BUA
47%
76%
17
Design storm inches
1 in
18
Design volume of SCM cu ft
45874 cf
19
Calculation method for design volume
Simple Method
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):

WET POND
F_'�Drainage area number
mnr FRnm mH _insn M
A2
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
4
Is the SCM located away from contaminated soils?
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes?
No
7
Are the inlets, outlets, and receiving stream protected from erosion
(10-year storm)?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
9
What is the method for dewatering the SCM for maintenance?
Drawdown Orifice
10
If applicable, will the SCM be cleaned out after construction?
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
12
Does the drainage easement comply with General MDC (9)?
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC (10)?
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
16
Does the SCM follow the device specific MDC?
Yes
17 Was the SCM designed by an NC licensed professional?
WET POND MDC FROM 02H .1053
181 Method used
Yes
SA/DA
19
Has a stage/storage table been provided in the calculations?
Yes
20
Elevation of the excavated main pool depth (bottom of sediment
removal) (fmsl)
1196.00
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
1197.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
1201.00
23
Elevation of the permanent pool (fmsl)
1201.50
24
Elevation of the top of the vegetated shelf (fmsl)
1202.00
25
Elevation of the temporary pool (fmsl)
1203.10
26
Surface area of the main permanent pool (square feet)
21548.00
27
Volume of the main permanent pool (cubic feet)
71664 cf
28
Average depth of the main pool (feet)
3.33 ft
29
Average depth equation used
Equation 2
301
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)
11876 cf
33
Is this 15-20% of the volume in the main pool?
Yes
34
Clean -out depth for forebay (inches)
54 in
35
Design volume of SCM (cu ft)
45874 cf
36
Is the outlet an orifice or a weir?
Orifice
371
If orifice, orifice diameter (inches)
3.5 in
38
If weir, weir height (inches)
39
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
2.4
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
Yes
42
Are berms or baffles provided to improve the flow path?
No
431
Depth of forebay at entrance (inches)
66 in
44
Depth of forebay at exit (inches)
60 in
45
Does water flow out of the forebay in a non -erosive manner?
Yes
46
Width of the vegetated shelf (feet)
6 ft
47
Slope of vegetated shelf (H:V)
6:1
48
Does the orifice drawdown from below the top surface of the
permanent pool?
Yes
49
Does the pond minimize impacts to the receiving channel from the 1-
yr, 24-hr storm?
Yes
50
Are fountains proposed? (If Y, please provide documentation that
MDC(9) is met.)
No
51
1 Is a trash rack or other device provided to protect the outlet system?
Yes
52
Are the dam and embankment planted in non -clumping turf grass?
Yes
53
Species of turf that will be used on the dam and embankment
Bermuda
54
Has a planting plan been provided for the vegetated shelf?
Yes
ADDITIONAL
INFORMATION
55
Please use this space to provide any additional information about
the wet pond(s):
Parcel is state owned land, therefore no drainage easement is required.
Wet Pond 3 3:52 PM 5/18/2020