SW5190701_Form_(Supp.EZ)_20190715

SUPPLEMENT-EZ COVER PAGE
n ,iS LOAD` L
PROJECT INFORMATION
1 i Project Name
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 vegetated setbacks provided (feet)
8 J Will the ve etated setback remain vegetated?
9 Is BUA other that as listed in .1003(4)(c-d) out of the
10 Is streambank stabilization proposed on this project?
Slier
No
0
No
NUMBER AND TYPE OF SCMs:
11 Infiltration System 0
12 ' Bloretention Cell 0
13 _
Wet Pond
0
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
1 Dry Pond
0
23
StormFi@er
0
0
0
1
24
Sllva Cell
25
Saylitter
26
I Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27 Name and Title:
31 1 Phone
32 Email:
Abbott, Principal Engineer
;ign & Engineering, PLLC
PO BOX 361
sedmoor, NC 27522
igneng.com
Certification Statement:
I certify, under penalty of law that this Supplement-FZ 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.
CAR,///
10 y•�=
SEAL
' 036242ba
S of Designe
�MM
Date

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
Filterra
5
Total BUA in project (sq ft)
56123 sf
16242 sf
6
New BUA on subdivided lots (subject to permitting)
(sq ft
10878 sf
7
New BUA outside of subdivided lots (subject to
permitting) (so
8
Offsite - total area (sq ft)
988 sf
988 sf
9
Offsite BUA (sq ft
988 sf
988 sf
10
Breakdown of new BUA outside subdivided lots:
Parkin (sq ft
Sidewalk (sq ft
Roof (sq ft
Roadway s ft
988 sf
988 sf
Future (sq ft
Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
sf
12
New infiltrating permeable pavement outside of
Isubdivided lots (sq ft
sf
sf
13permitting)
Exisitng BUA that will remain (not subject to
s ft
12257 sf
sf
14
Existing BUA that is already permitted (sq ft
45245 sf
sf
15
Existing BUA that will be removed (sq ft
sf
sf
16
Percent BUA
56%
74%
17
Design storm inches
1 in
18
Design volume of SCM cu ft
n/a
19
1 Calculation method for design volume
n/a
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):
The Site is comprised of existing building and parking lot and walks.The
existing building will remain, but the parking lot will be demolished, regraded
and repaved and the difference of the final total impervious and the existing
impervious treated by the Filterra (Primary SCM)

FILTERRA BIORETENTION
1
Drainage area number
#3 (ST-3 in calcs)
2
Design volume of SCM (cu ft)
N/A
GENERAL
MDC FROM 02H .1050 111F-
Is the SCM sized to treat the SW from all surfaces at
build -out? Yes.
Is the SCM located away from contaminated soils? Yee
3
4
5
What are the side slopes of the SCM (H:V)?
n/a
6
Does the SCM have retaining walls, gabion walls or
other engineered side slopes?
Ale
7
Are the inlets, outlets, and receiving stream protected
from erosion (10-year storm)?
8
Is there an overflow or bypass for inflow volume in
excess of the design volume?
Yee
9
What is the method for dewatering the SCM for
maintenance?
Drawdown Orifice
10
If applicable, will the SCM be cleaned out after
construction?
Ale
11
Does the maintenance access comply with General
MDC (8)?
Y-es.
12
Does the drainage easement comply with General
MDC (9)?
Yee
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)?
Yee
15
Is there an O&M Plan that complies with General MDC
(12)?
Yes.
16
Does the SCM follow the device specific MDC?
Yee
17
Was the SCM designed by an NC licensed
professional?
Yee
FILTERRA BIORETENTION MDC FROM THE STORMWATER DESIGN MANUAL
18
Type of pretreatment that will be used
N/A
19
Depth of storage above the filter media surface (in)
Surface area of the Filterra Bioretention system (sq ft)
per Filterra
20
91 sf
21
Method of flow distribution over the media
sheet
22
Infiltration rate of engineered media (inch/hour)
140 in/hr
23
Diameter of the underdrain pipes (if applicable)
6 in
24
Does the design include Internal Water Storage (IWS)?
if so, elevation of the top of the IWS (fmsl)
Ale
25
26
Elevation of the planting surface (fmsl)
Throat at 107.57
27
Species of tree(s) that will be planted
per Filterra
28
Media depth (inches)
21 in
29
Number of clean out pipes
2
30
Will maintenance be performed per the Filterra O & M
Manual?
Yee
ADDITIONAL INFORMATION _
Please use this space to provide any additional
31 information about the Filterra Unit(s):