SW3190601_Form_(Supp.EZ)_20200311

SUPPLEMENT=EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Marvin Gardens
2
Project Area ac
38,6986
3
Coastal Wetland Area ac
0
4
Surface Water Area ac
0
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
8
Will the vegetated setback remain vegetated?
LLw50
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:
FORMS LOADED
InfiltrationS stem
0
Bioretention Cell
0
F14
Wet Pond
2Stormwater
Wetland
0
Permeable Pavement
0
16
1Sand 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
Bayfilter
0
26
Filterra
0
DESIGNER CERTIFICATION
27 Name and Title: Chris Bostic, PE -Pro ect Mana er
28
Organization: _
Kimle -Horn and Associates, Inc
29
Street address:
421 Fayetteville Street, Suite 600
30
City,State, Zip:
Raleigh, NC 27601
31
Phone numbers :
919-653-2927
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.
Signatur f Designer
3 ' 10-2GZ0
Date

DRAINAGE AREAS
1
Ils this a high density project?
Yes
so, number of drainage areas/SCMs
2
ftIf
all/part of this project subject to previous rule
rsions?
No
FORMS LOADED
DRAINAGE AREA INFOR
Entire Site
1
2
4
Type of SCM
Wet Pond
Wet Pond
5
Total BUA in project (sq ft
665161 sf
152460 sf
422096 sf
6permitting)
New BUA on subdivided lots (subject to
s ft
sf
sf
sf
7
New BUA outside of subdivided lots (subject to
permitting) (sf)
665161 sf
152460 sf
422096 sf
8
Offsite - total area (sq ft)
sf
sf
sf
9
Offsite BUA (sq ft)
sf
sf
sf
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
166776 sf
sf
166776 sf
Sidewalk (sq ft
51158 sf
sf
35912 sf
Roof (sq ft
67108 sf
sf
67108 sf
Roadway s ft
200359 sf
sf
125000 sf
Future (sq ft
179760 sf
152460 sf
27300 sf
Other, please specify in the comment box
below (sq ft)
sf
sf
sf
11
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
sf
sf
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft)
sf
sf
sf
13permitting)
Exisitng BUA that will remain (not subject to
s ft
sf
sf
sf
14
Existina BUA that is already permitted (sq ft
sf
sf
sf
15
Existing BUA that will be removed (sq ft
90605 sf
sf
sf
16
Percent BUA
39%
61 %
77%
17
Design storm inches
1 in
1 in
1 in
18
Design volume of SCM cu ft
12473 cf
33933 cf
19
Calculation method for design volume
SA/DA
SA/DA
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):

WET POND
F-11Drainaae area number
MDC FROM 02H .1050
31
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
engineered side slopes?
Yes
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?
Drawdown Orifice
Drawdown Orifice
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)?
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
IWET POND MDC FROM 02H .1053
18
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
removal) (fmsl)
641.00
639.00
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
642.00
640.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
647.00
644.00
23
Elevation of the permanent pool (fmsl)
648.00
645.00
24
Elevation of the top of the vegetated shelf (fmsl)
648.00
645.00
25
Elevation of the temporary pool (fmsl)
649.03
646.44
26
Surface area of the main permanent pool (square feet)
9999:1
18436:1
27
Volume of the main permanent pool (cubic feet)
26793 cf
60998 cf
28
Average depth of the main pool (feet)
3.72 ft
3.42 ft
29
Average depth equation used
Equation 3
Equation 3
30
If using equation 3, main pool perimeter (feet)
550.0 ft
619.0 ft
31
If using equation 3, width of submerged veg. shelf (feet)
6.0 ft
6.0 ft
32
Volume of the forebay (cubic feet)
4726 cf
11152 cf
33
Is this 15-20% of the volume in the main pool?
Yes
Yes
34
Clean -out depth for forebay (inches)
60 in
48 in
35
Design volume of SCM (cu ft)
12473 cf
33933 cf
36
Is the outlet an orifice or a weir?
Orifice
Orifice
37
If orifice, orifice diameter (inches)
2.0 in
3.0 in
38
If weir, weir height (inches)
39
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
2.05
2.17
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)
72 in
60 in
44
Depth of forebay at exit (inches)
66 in
54 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
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?
Yes
Yes
531
Species of turf that will be used on the dam and embankment
Bermuda
Bermuda
b4l
Has a planting plan been provided or the vegetate shelf?
es es
ADDITIONAL
INFORMATION
55
Please use this space to provide any additional information about
the wet pond(s):
For Wet Pond 1, the emergency drain elevation is set based on the
downstream pipe outfall elevation. If conditions warranted, the remaining
depth would be pumped out.
Wet Pond 3 4:41 PM 3/10/2020