SW6190504_SuppEZ- REV19July2019_7/22/2019

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
Project Name
Project Area ac
Hoke Coun Coop±rative Extension Office Building
2
5.4 acres
3
Coastal Wetland Area ac
0 acres
4
Surface Water Area ao
0 acres
5
Is this project High or Low Density?
High
6 1
_
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
NA
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1003 4 c-d out of the setback?
Yes
10
Is streambank stabilization proposed on this project?
Yes
NUMBER AND TYPE OF SCMS:
11
Infiltration System
2
12
Bioretention 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 (IS-FS
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
Dry Pond
StormFilter
Silva Cell _
Bayfilter
0
22
0
23
0
24
0
25
_
0
0
26
Filterra
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Blair Pittman, PE
28
Organization:
Bobbin Design Build, Inc.
29
Street address:
600 Germantown Road
30
City, State, Zip:
Raleigh, NC 27607
31
Phone number(s):
Email:
919 851-1980
32
[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.
19
Date

DRAINAGE AREAS
1
Is this a hi h densi roject?
Yes
2
if so, number of drainage areaslSCMs
2
3
Is alUpart of this project subject to previous rule
versions?
No
FORMSLOADED
DRAINAGE AREA INFORMATION
Entire Site
4
Type of SCM
NA
5
Total BUA in project (sq ft
265355 sf
6
New BUA on subdivided lots (subject to permitting)
ft
7permitting)
New BUA outside of subdivided lots (subject to
s
60755 sf
8
Offsile - total area (sq ft
9
Offske BUA (sq ft
10
Breakdown of new BUA outside subdivided lots:
- Parkin ft
38590 sf
Sidewalk ft
6165 sf
Roof ft
16000 sf
- Roadwa ft
- Future ft -
Other, please specify in the comment box
below ft
11
New infiltrating permeable pavement on
subdivided lots ft
12
New infiltrating permeable pavement outside of
subdivided lots ft
13 1
Exisitng BUA that will remain (not subject to
permittin ft
204600 sf
14
Existing BUA that is already permitted (sq ft
15
Existing 8UA that will be removed ft
16
Percent BUA
31%
17
Design storm inches
1 in
18
Desi n volume of SCM(Cu ft
19 Calculation method for design volume
ADDITIONAL INFORMATION _
Please use this space to provide any additional information about the
20 1drainage area(s):

INFILTRATION SYSTEM
1 Drainage area number 1 2
2 j Design volume of SCM (cu ft) 3724 cf 4040 cf
OlNERAL
MM FRUM U2M .IUSU
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)?
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)?
3:1
3:1
6
No
No
7
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?
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)?
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?
Yes
Yes
RL ON SYSTEM MDC FROM 021-1.1051
18 Proposed slope of the subgrade surface (%) 0% 0%
19 Are terraces or baffles provided? No No
20 Type of pretreatment: Other Other
i!!s Data
Was the soil investigated in the footprint and at the elevation of the infiltration
21
system?
SHWT elevation (fmsl)
Depth to SHWT per soils report (in)
Yes
Yes
22
245.50
NONE FOUND
23
42.00
NONE FOUND
24
Ground elevation at boring in soils report (fmsl)
249.00
250.00
25
Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet?
26
Soil infiltration rate (in/hr)
2.00
2.00
27 1
Factor of safety (FS) (2 is recommended):
2.00
2.00
29
Bottom elevation (fmsl) 247.5 ft
247 It
30
IStorage elevation (fmsl) 248.5 ft
248. ft
31
1 Bypass elevation (fin 248.5 ft
248 ft
For Basins only
32 Bottom surface area, ftz: 2962 ft 3172 ft
33 Storage elevation surface area (ft) 4855 ft 4977 ft
%r 'trenches Only
34
35
Length (ft)
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 (%)
Is stone free of fines?
N4341
42
Is the stone wrapped in geotextile fabric?
Has at least one infiltration port been provided?
Volumes/Drawdown
44 Design volume of SCM (cu ft)
45 Time to drawdown (hours)
ADDITIONAL INFORMATION
��.....
Please use this space to provide any
46 system(s):
Infiltration 3 1:46 PM 7/22/2019