SW5140801_Supplement-EZ Form_20220615

SUPPLEMENT-EZ COVER PAGE
LOAD SUPPLEMENT FORMS
PROJECT INFORMATION
1 Project Name ACFT
2 Project Area ac 7.4
3 Coastal Wetland Area ac 0
4 Surface Water Area ac 0
5 Is this project High or Low Density? High
6 Does this protect use an off -site SCM? No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
N/A
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
1 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
113ayfilter
0
26
lFilterra
0
LOAD SUPPLEMENT FORMS
DESIGNER CERTIFICATION
27
Name and Title:
Frank Slinsk , P.E., Senior Project Manager
28
Organization:
Timmons Group
29
Street address:
5410 Trinity Road, Suite 102
30
City, State, Zip:
Raleigh, NC, 27607
31
Phone numbers :
919 866-4505
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.
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Signature of Designer
5/20/2022
Date

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
2
3
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
4
T pe of SCM
Wet Pond A
Wet Pond B
5
Total BUA in project (sq ft
72313 sf
61705 sf
10608 sf
6
New BUA on subdivided lots (subject to
ermitting) (sq ft
sf
sf
sf
7
New BUA outside of subdivided lots (subject to
permitting) (sf)
70878 sf
61705 sf
9173 sf
8
Offsite - total area (sq ft)
9
Offsite BUA (sq ft
10
Breakdown of new BUA outside subdivided lots:
- Parking (sq ft
sf
- Sidewalk (sq ft
45984 sf
7587 sf
- Roof (sq ft
sf
- Roadway s ft
sf
sf
- Future (sq ft
15721 sf
1586 sf
- Other, please specify in the comment box
below (sq ft)
sf
11
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
sf
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft
sf
sf
13
Exisitng BUA that will remain no subject to
ermitting) (sq ft
sf
1435 sf
14
Existing BUA that is already ermitted (sq ft
sf
sf
15
Existing BUA that will be removed (sq ft
sf
sf
16
Percent BUA
50%
19%
17
Design storm inches
1 in
1 in
18
Design volume of SCM cu ft
5147 cf
1032 cf
19
Calculation method for design volume
Simple Method
Simple Method
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):
Wet pond B will not have an increase in impervious area or total drainage
I'
Wet pond B will not be modified as part of this project.

WET POND
1 Drainage area number 1 (Pond A)
2 Design volume of SCM (cu ft) 5147 cf
GFNFRAI MDC FROM n7H .1n5n
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Is the SCM located away from contaminated soils?
Yes
4
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)?
No
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?
Yes
IWFT PONn MOG FRAM 09H 1nF3
181
Method used I
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)
477.00
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
478.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
483.50
23
Elevation of the permanent pool (fmsl)
484.00
24
Elevation of the top of the vegetated shelf (fmsl)
484.50
25
Elevation of the temporary pool (fmsl)
484.83
26
Surface area of the main permanent pool (square feet)
4213.00
27
Volume of the main permanent pool (cubic feet)
13460 cf
28
Average depth of the main pool (feet)
3.19 ft
29
Average depth equation used
Equation 2
301
If using equation 3, main pool perimeter (feet)
N/A
31
If using equation 3, width of submerged veg. shelf (feet)
N/A
32
Volume of the forebay (cubic feet)
2389 cf
33
Is this 15-20% of the volume in the main pool?
Yes
34
Clean -out depth for forebay (inches)
72 in
35
Design volume of SCM (cu ft)
5148 cf
36
Is the outlet an orifice or a weir'?
Orifice
371
If orifice, orifice diameter (inches)
1.3 in
38
If weir, weir height (inches)
N/A
39
If weir, weir length (inches)
N/A
40
Drawdown time for the temporary pool (days)
2.8
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)
72 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
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
Has a planting plan been provided or the vegetate shelf.?
Yes
ADDITIONAL
INFORMATION
55
Please use this space to provide any additional information about
the wet pond(s):
The property is a 5,000 acre, state-owned parcel. It is exempt from
recording drainage easements. Wet pond B will not have an increase in
impervious area or total drainage area. Wet pond B will not be modified as
part of this project.
Wet Pond 3 4:54 PM 5/19/2022