SW6191005_Supplement-EZ Form_20200217

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 1 Project Name DINING FACILITY (DFAC), SOTF
2
Pro'ectArea as
2.25
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
N/A
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 S stem
3
0
12
Bioretention Cell
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
Da Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Bayfilter
0
26
_
Filterra
_
0
FORMS LOADED
,ESIGNER CERTIFICATION T
27 Name and Title:
28 Or anization:
29 Street address:
30 Cit , State, Zip:
31 Phone numbers :
32 f Email:
901 Jones Franklin Rd, Suite 300
Raleigh, NC 27606
919-532-2331
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.
[]_esigner
CA0
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SEAL
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seal
Signature of Designer
L / 31 12,0
Date

DRAINAGE AREAS
1
Is this a high density ro'ect?
Yes
2
If so, number of drainage areas/SCMs
3
3
Is all/part of this project subject to previous rule
versions?
I No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire 5ite
1
2
3
4
Type of SCM
Infiltration Basin
Infiltration Basin
Infiltration Basin
5
Total BUA in project (sq ft
35838 sf
26455 sf
11595 sf
11207 sf
6
New BUA on subdivided lots (subject to permitting)
(sq ft)New
7permitting)
BUA outside of subdivided lots (subject to
s
34998 sf
12196 sf
11595 sf
11207 sf
8
Offsite - total area (sq ft
13419 sf
9
Offsite BUA (sq ft
13419 sf
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
22802 sf
11595 sf
11207 sf
Sidewalks ft
2613 sf
2613 sf
Roof (sci ft
9583 sf
9583 sf
_
Roadway s ft
Future (sq ft
Other, please specify in the comment box
below sq ft)
New infiltrating permeable pavement on
11 subdivided lots (sq ft)
12
New infiltrating permeable pavement outside of
subdivided lots s ft
13permitting)
Exisitng BUA that will remain (not subject to
s ft
4239 sf
9219 sf
14
Existing BUA that is already permitted s ft
840 sf
5040 sf
15
Existing BUA that will be removed (sq ft
16
Percent BUA
37%
59%
32%
63%
17
Design storm inches
1 in
1 in
1 in
1 in
18 I Design volume of SCM cu ft
19 -Calculation method for design volume
3513 cf
Simple
2172 cf
Simple
1020 cf
Simple
915 cf
Simple
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
20 drainage area(s):
Drainage Area 1: There is both existing permitted off -site BUA of 4,200 SF
and existing on -site permitted BUA of 840 SF = 5,040 SF in Line 14. The
4,200 SF existing permitted off -site BUA + 9,219 SF of Line 13 = Line 9.
Therefore, Line 13 + Line 14 + Line 7 = Line 5

INFILTRATION SYSTEM
1 Drainage area number 1 2 13
2 Design volume of SCM (cu ft) 2172 cf 1020 cf 915 cf
GENERAL MDC FROM 02H .1050
3 Is the SCM sized to treat the SW from all surfaces at build -out? yes yes yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
3:1
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered side slopes?
No
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)?
Is there an overflow or bypass for inflow volume in excess of the design volume?
Yes
Yes
Yes
8
Yes
Yes
Yes
9
What is the method for dewatering the SCM for maintenance?
Pump (preferred)
Pump (preferred)
Pump (preferred)
10
If applicable, will the SCM be cleaned out after construction?
11
Does the maintenance access comply with General MDC (8)?
Yes
Yes
Yes
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)?
14
Is there an O&M Agreement that complies with General MDC (11)?
_
15
Is there an O&M Plan that complies with General MDC (12)7
16
Does the SCM follow the device specific MDC?
Yes
Yes
17 'Was the SCM designed by an NC licensed professional? Yes Yes Yes
INFILTRATION SYSTEM MDC P H .1
18 Proposed slope of the subgrade surface (%)
0%.
0%
0%
19 jAre terraces or baffles provided?
No
No
No
20 Type of pretreatment:
Other
Other
Other
Soils Data
21
Was the soil investigated in the footprint and at the elevation of the Infiltration
system?
Yes _
Yes
Yes
> 2 feet from
bottom
22
SHWT elevation (fmsl)
> 2 feet from
bottom
> 2 feet from
bottom
23
Depth to SHWT per soils report (in)
>10 feet
>10 feet
>16 feet
24
Ground elevation at boring in soils report (fmsl)
297.00
300.50
298.00
25
Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet?
26
Soil infiltration rate (in/hr)
3.00
2.50
3.00
27
Factor of safety (FS) (2 is recommended):
2,00
2.00
2.00
=I.—H-
29
Bottom elevation (fmsl)
295.75 ft
297.25 ft
297.25 ft
30
Storage elevation (fmsl)
297.25 ft
298.75 ft
298.75 ft
31
lBypass elevation (fmsl)
297.25 ft
298.75 ft
298.75 ft
I Fnr RA vine 016111
32
Bottom surface area, fe:
1535 ft 1165 ft
785 ft
33
Storage elevation surface area (ft)
3170. ft 2005. ft
1540. ft
For Trenchesynry
34 Length (ft)
35 Width (ft)
36 Perforated pipe diameter, if applicable (inches)
37 Number of laterals
38 Total length of perforated piping
39 Stone type, if applicable
40 Stone void ratio (%)
41 Is stone free of fines?
42 Is the stone wrapped in geotextile fabric?
43 Has at least one infiltration port been provided?
Volumes/Drawdown
44 Tesign volume of SCM (cu ft) _
45 ITime to drawdown (hours)
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
46 system(s):
Note: See attached O+M letter for Ft. Bragg ,compliance.
2172 cf 1 1020 cf 1 915 cf
Infiltration 3 2:46 PM 1/31/2020