SW3191101_Supplement-EZ Form_20191223

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Project Area ac
Cambridge Village Multifamily
11.5
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
10
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1 0034 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
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Steve Farmartino, Project Manager
28
Organization:
Bohler Engineering
29
Street address:
1927 South Tryon St Suite 310
30
City, State, Zip:
Charlotte, NC 28204
31
Phone numbers :
980 272-3400
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.
oQ �ool
SEAL -
8 047366 o
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Signature of Designer
Seal
Date

DRAINAGE AREAS
1
Is this a high density ro�ect?
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 A
Entire Site
1
2
4
Type of SCM
Wet Pond
Wet Pond
5
Total BUA in project (sq ft
288109 sf
89722 sf
198387 sf
6permitting)
New BUA on subdivided lots (subject to
s ft
N/A
N/A
N/A
7permitting)
New BUA outside of subdivided lots (subject to
s
288109 sf
89722 sf
198387 sf
8
JOffsite - total area (sq ft
114127 sf
sf
114127 sf
9
Offsite BU(sq ft
sf
sf
sf
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
153830 sf
49276 sf
104554 sf
Sidewalk (sq ft
22119 sf
5923 sf
16196 sf
Roof (sq ft
103250 sf
34523 sf
68727 sf
Roadway s ft
sf
sf
sf
Future sq ft
sf
sf
sf
Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
sf
sf
12
New infiltrating permeable pavement outside of
Isubdivided lots (sq ft
sf
sf
sf
13permitting)
Exisitng BUA that will remain (not subject to
s ft
sf
sf
sf
14
Existing BUA that is already permitted (sq ft
sf
sf
sf
15
Existing BUA that will be removed (sq ft
sf
sf
8910 sf
16
Percent BUA
58%
66%
30%
17
Design storm inches
1 in
1 in
1 in
18
1 Design volume of SCM cu ft
98490 cf
29433 cf
69057 cf
19 Calculation method for design volume SA/DA
DITIONA FORMATION
Please use this space to provide any additional information about the
r2O drainage area(s):
SA/DA
SA/DA

WET POND
1
Drainage area number Prop DA-1
Prop DA-2
2
Design volume of SCM (cu ft) 48718 cf 113807 cf
L MUCTROM 02H.1050
Is the SCM sized to treat the SW from all surfaces at build -out? Yes NO.
3
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?
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
No
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)?
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?
D MDC FROM 02H .1053
Yes
SA/DA
Yes
SA/DA
18
Method used
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)
781.00
770.00
21
Elevation of the main pool bottom -(top of sediment removal) (fmsl)
782.00
771.00
22
Elevation of the bottom of the vegetated shelf (fmsl)
787.00
776.00
23
Elevation of the permanent pool (fmsl)
787.50
776.50
24
Elevation of the top of the vegetated shelf (fmsl)
788.00
777.00
25
Elevation of the temporary pool (fmsl)
788.50
777.25
26
Surface area of the main permanent pool (square feet)
5852:1
6548:1
27
Volume of the main permanent pool (cubic feet)
20834 cf
24570 cf
28
Average depth of the main pool (feet)
4.20 ft
4.30 ft
29
Average depth equation used
Equation 3
Equation 3
30
If using equation 3, main pool perimeter (feet)
306.0 ft
315.0 ft
31
If using equation 3, width of submerged veg. shelf (feet)
3.0 ft
3.0 ft
32
Volume of the forebay (cubic feet)
3575 cf
4428 cf
33
Is this 15-20 % of the volume in the main pool?
Yes
Yes
34
Clean -out depth for forebay (inches)
12 in
12 in
35
Design volume of SCM (cu ft)
48718 cf
113807 cf
36
Is the outlet an orifice or a weir?
Orifice
Orifice
37
If orifice, orifice diameter (inches)
2 in
3 in
38
If weir, weir height (inches)
39
If weir, weir length (inches)
40
Drawdown time for the temporary pool (days)
2.81
2.68
41
Are the inlet(s) and outlet located in a manner that avoids short-
circuiting?
No
Yes
42
Are berms or baffles provided to improve the flow path?
Yes
No
43
Depth of forebay at entrance (inches)
66 in
66 in
44
Depth of forebay at exit (inches)
54 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?
No
No
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
iALthe dam and embankment planted in non -clumping turf grass?
Yes
Yes
53
Species of turf that will be used on the dam and embankment
Bermuda
Bermuda
54
Has a planting plan been provided for the vegetated shelf?
Yes Yes
ADDITIONAL
INFORMATION
55
Please use this space to provide any additional information about
the wet pond(s):
Wet Pond 3 9:37 AM 12/23/2019