SW5190401_BMP Supplement Form Resubmittal_6/13/2019

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 1 Project Name NCCU Student Center
2
Project Area ac
4.55
3
Coastal Wetland Area ac
4
Surface Water Area ac
5
Is this project High or Low Densi •
High
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
NIA
8
Will the vegetated setback remain vegetated?
9
Is BUA other that as listed in .1 0034 c-d out of the setback?
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
0
14
Stormwater Wetland
0
15
Permeable Pavement
0
16
Sand Filter
1
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
DryPond
0
23
StormFilter
0
24
Silva Cell
0
25
Bayfilter
Filterra
0
26
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Jonathan Allen
28
Or anization:
CALYX Engineers
29
Street address:
yon Road
6750 Tr
30
City, State, Zip: _
Cary, NC, 27518
31
Phone numbe s _:
919-858-1831
32
Email:
[e-mail]
Certification Statement:
I certify, under penalty of law that this Supplement-E:Z 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
Lwith the information provided here_
Oesi ner
2)49,7
............
C2*tztff'
Sign of Designer
Date 3

SAND FILTER
1
Drainage area number
Design volume of SCM (cu ft)
2
2
s
E
3
4
Is the SCM sized to treat the SW from all surfaces at build -out?
Is the SCM located away from contaminated soils?
What are the side slopes of the SCM (H:V)?
gees
Yes
5
6
7
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
Are the inlets, outlets, and receiving stream protected from erosion (10-
year storm)?
No
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?
No
Yes
11
Does the maintenance access comply with General MDC (8)?
12
Does the drainage easement comply with General MDC (9)?
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC (10)?
Is there an O&M Agreement that complies with General MDC (11)?
14
Yes
Yes
Yes
es
15
Is there an O&M Plan that complies with General MDC (12)?
16
Does the SCM follow the device specific MDC?
17
as t e designedy an licensedpro essional?
SAN13
FILTER MDC FROM 02H 1056
18
19
SHWT elevation (fmsl) _
Type of sand filter (open or closed)
340
Closed
Pre Cast
20
If closed, will the filter will be pre -cast or pour -in -place?
21
If closed, top of grate elevation (fmsl)
352.5
22
Is this sand filter designed to attenuate peak flows?
No
Sediment Chamber
23
Volume that can be retained in the sediment chamber (cubic feet)
Will there be a permanent pool in the sediment chamber?
420 of
24
Yes
344.00
105 st
25
Bottom of the sediment chamber (fmsl)
26
Area of the sediment chamber (square feet)
27
28
Physical depth of the sediment chamber (inches)
Ponding depth in the sediment chamber, above any permanent pool
(inches)
8 in
48 in
346.75
29
Elevation of top of weir between chambers (fmsl)
Sand Chamber
30
Volume that can be retained in the sand chamber (cubic feet)
420 of
31
Bottom of the sand chamber (fmsl)
344.00
105 sf
32
Area of the sand chamber (square feet)
33
Physical depth of the sand chamber (inches)
18 in
34
Ponding depth in the sand chamber, above any permanent pool
(inches)
48 in
350.75
35
Elevation of the bypass device (fmsl)
36
Type of bypass device
Weir
37
Mechanism for distributing flow over the sand surface
Rip rap
38
Sand specification for sand chamber
ASTM C33
39
Depth above underdrain pipe (inches)
25 in
40
Will the media be maintained to drain at least two inches per hour at
the sand surface?
Yes
41
Is at least one clean -out pipe provided at the low point of each
underdrain line?
c can -out pipes be cappe�0
Yes
42
Yos
ADDITIONAL
INFORMATION
43
Please use this space to provide any additional information about the
Sand Filter(s):
Sand Filter 1 3:04 PM 6/13/2019

DRAINAGE AREAS
1 Is this a hi h density project? Yes
2 Drainage Areas,
2 If so, number of drainage areas/SCMs 1 SCM
Is all/part of this project subject to previous rule
3 versions? No
CLICK TO LOAD FORM
DRAINAGE
AREA INFORMATION
Entire Site
4
Type of SCM
Sand Filter
5
Total BUA in project (sq ft
125449 sf
14052 sf
6
New BUA on subdivided lots (subject to
rmittin s ft
7permitting)
New BUA outside of subdivided lots (subject to
sf
125449 sf
14052 sf
8
Offsite - total areas ft
9
Offsite BUA (sq f
Breakdown of new BUA outside subdivided lots:
Parkin s(sq ft]
Sidewalk (sq ft)
Roof (sq ft)
Roadw2y is fti
Future (s3 ft)
Other, please specify in the comment box
below (sq ft)
New infiltrating permeable pavement on
subdivided lots (sq ft
10
46403 sf
13903 sf
11
27362 sf
149 sf
51684 sf
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft
13permitting)
Exisitng BUA that will remain (not subject to
(sq ft)
14
Existing 8UA that is already permitted (sq ft)
15
Existing BUA that will be removed {sg
122054 sf
7788 sf
16
-17
Percent BUA
D_esign storm (inches)
Des gn volume of SCM (cu ft)
Calculation method for design volume
63%
89%
18
1 in
833 cf
1 in
833 cf
19
Simple
Sim le
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
20 drainage area(s):
The site is divided into 2 drainage areas. Only 1 SCM is proposed. The
sand filter is located in Drainage Area #2.
DRAINAGE AREA INFORMATION
Entire Site
t
4
T e of SCM
WA
5
6
Total BUA from project (sq ft)
1995 rules
SL 2006-246
2008 rules
2017 rules
7
New BUA on subdivided lots (subject to
permitting) (sq ft)
1995 rules _
SL 2006-246 _
2008 rules
2017 rules
New BUA outside of subdivided lots (subject
to permitting) (sf)
1995 rules
SL 2006-246
2008 rules
2017 rules
Offsite - total area (sq tt)
8
9
1995 rules
SL 2006-246
2008 rules
2017 rules
10
Offsite BUA (sq ft)
1995 rules
SL 2006-246
2008 rules
2017 rules