SW4220501_Supplement-EZ Form_20220510

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
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1
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Project Name
2
Project Area ac
3
Coastal Wetland Area ac
4
Surface Water Area ac
5
Is this project High or Low Density?
6
Does this project use an off -site SCM?
COMPLIANCE WITH 02H .1003(4)
7
Width of ve etated setbacks provided feet
50
8
Will the vegetated setback remain vegetated?
Yes
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
N/A
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMS:
11
Infiltration System
12
Bioretention Cell
13
Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting RWH
18
Green Roof
19
Level Spreader -Filter Strip LS-FS
20
Disconnected Impervious Surface DIS
21
Treatment Swale
22
Dry Pond
23
StormFilter
24
Silva Cell
25
Ba filter
2
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
GREGORY R. HOFFMAN, P.E.
28
Organization:
CIVIL DESIGN CONCEPTS, PA
29
Street address:
168 PATTON AVE
30
City, State, Zip:
ASHEVILLE, NC 28801
31
Phone numbers :
828 252-5388
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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Date

DRAINAGE AREAS
1
Is this a high density pro ect?
Yes
2
If so number of drainage areas/SCMs
2
3
Does this project have low density areas?
No
4
If so number of low density drainage areas
0
Is all/part of this project subject to previous rule
5
versions?
No
FORMS LOADED
DRAINAGE
AREA INFORMATION
Entire Site
1
2
4
Type of SCM
Ba filter
Ba filter
5
Total drainage area (sq ft
223953
197022
26931
6
Onsite drainage area (sq ft
223953
197022
26931
7
Offsite drainage area (sq ft
N/A
N/A
N/A
8
Total BUA in pro ect (sq ft
184999 sf
163350 sf
21649 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
N/A
N/A
N/A
10
New BUA not on subdivided lots (subject to
ermittin sf
N/A
N/A
N/A
11
Offsite BUA (sq ft
N/A
N/A
N/A
12
Breakdown of new BUA not on subdivided lots:
- Parking (sq ft
13446 sf
13446 sf
sf
- Sidewalk (sq ft
10846 sf
10846 sf
sf
- Roof (sq ft
74390 sf
74390 sf
sf
- Roadway s ft
86317 sf
64655 sf
21662 sf
- Future (sq ft
N/A
N/A
N/A
- Other, please specify in the comment box
below (sq ft
N/A
N/A
N/A
13
New infiltrating permeable pavement on
subdivided lots (sq ft
N/A
N/A
N/A
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
N/A
N/A
N/A
15permitting)
Existing BUA that will remain (not subject to
s ft
N/A
N/A
N/A
16
Existing BUA that is already permitted (sq ft
N/A
N/A
N/A
17
Existinq BUA that will be removed (sq ft
N/A
N/A
N/A
18
Percent BUA
82%
83%
80%
19
Desi n storm inches
1.0 in
1.0 in
1.0 in
20
1 Design volume of SCM cu ft
9800 cf
1303 cf
21
lCalculation method for design volume
1" WQV
1" WQV
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

BAYFILTER
1
Drainage area number
1
2
2
Minimum required treatment volu me cu ft
9800 cf
1303 cf
GENERAL
MDC FROM 02H .1050
Is the SCM sized to treat the SW from all surfaces at build -out? Yes Yes
3
4
Is the SCM located away from contaminated soils?
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
N/A
N/A
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes?
N/A
N/A
7
Are the inlets, outlets, and receiving stream protected from erosion
10- ear 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?
N/A
N/A
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
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 desi ned by an NC licensedprofessional?
Yes
Yes
BAYFILTER
MDC FROM THE STORMWATER DESIGN MANUAL
18
If Volume Design is used, what is the volume from the drainage area
(cubic feet)?
9800 cf
1303 cf
19
Is an upstream detention used?
Yes
Yes
20
Volume of the upslope detention system (cubic feet)
4699 cf
1407 cf
21
Percent of the design volume contained in the upslope detention
s stem
46%
100%
22
If Rate Based Sizing is used, for 1 inch or 1.5 inch (Coastal areas).
Water Quality flow rate for drainage area cfs
N/A
N/A
23
Number of cartridges
8
1
24
Cartridge height (inches)
22 in
22 in
25
SHWT elevation fmsl
2665
2665
26
Elevation of bottom of Ba Filter vault fmsl
2667.65
2667.65
27
Clearance from the SHWT (feet)
2.65 ft
2.65 ft
28
BayFilter Media Flow Rate (GPM/ft2 of Media Surface)
.5 gpm/sf
.5 gpm/sf
29
Does the system includes a sediment sump?
No
No
30
If yes, the diameter of the sum feet
N/A
N/A
31
If yes, the depth of the sump (feet)
N/A
N/A
32
Time to drain the sump (hours)
N/A
N/A
33
Time to drain the Ba Filter hours
27.5 hrs
25 hrs
34
Is an off-line flowsplitting device used?
No
No
35
Type of media used (EMC or GAC-metals)
EMC
EMC
36
"r" maintenance be performed by Certified Maintenance Providers
er instructions?
Yes
Yes
ADDITIONAL INFORMATION
37
Please use this space to provide any additional information about
the Ba Filters stems :