SW5210304_Supplement-EZ Form_20210617

I - I A
SUPPLEMENT-EZ COVER PAGE
LORMS LOADED
1 Project Name Youngsville Mini Storage
2 Project Area (ac) 8.81
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
COMPILIANCE WITH 02H.1003(4)
7
Width of vegetated setbacks provided (feet)
N/A
8
Will the vegetated setback remain vegetated?
N/A
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 pmject?
No
'kUMBER AND TYPE . OF SCMs:
11 Infiltration System 2
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
Silva Cell
Bayfilter
Filterra
I FORMS LOADED :1
Certification Statement:
I cerffy, 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 engineenng plans,
specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here.
0"111111111111, 1
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SEAL
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Signature of Designer
41�lwz ( -
Date

DRAINAGE AREAS
1
Is this a high deniki project?
Yes
2
If so, number of drainage areas/SCMs
4
3
Does this project have low density areas?
No
4
If so, number of low density drainage areas
0
5
Is all/part of this project subject to previous rule
versions?
No
I FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
3
1 4
4
Type of SCM
Varies
Infiltration Basin
Bypass
Infiltration Basin
Bypass
5
Total drainage area (sq ft)
383795
110767
62552
149814
60662
6
Onsite drainage area (sq ftJ
383795
110767
62552
149814
60662
7
Offsite drainage area (sq ft)
8
Total BUA in project (sq ft)
234899sf
90693sf
27595 sf
96107sf
20504sf
9
New BUA on subdivided lots (subject to
permitting) (sq ft)
New BUA not on subdivided lots (subject to
permitting) (so
site BUA (sq ft)
1
rBreakdown of new BUA not on subdivided lots:
- Parking (sq ft)
- Sidewalk (sq
10
234899 sf
90693sf
27595 sf
96107 sf
20504 sf
11
12
-
27479sf
10073sf
90938 sf
1416 sf
- Roof (sq ft)
49146sf
9600sf
- Roadway (sq ft)
6506 sf
- Future (sq ft)
- Other, please specify in the comment box
below �N ftJ
14068sf
5169 sf
20504 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft)
14
New infiltrating permeable pavement not on
subdivided lots (sq ft)
15
Existing BUA that will remain (not subject to
permitting) (sq ft)
16
Existina BUA that is already perrnifted (sq ft)
17
Existing BUA that will be removed (sq ft)
7154 sf
18
Percent BUA
61%
1.0 in
82%
1.0 in
44%
1.0 in
64%
1.0 in
34%
1.0 in
19
Design storm (inches)
20
Design volume of SCM (cu ft)
14230cf 10814 cf
Simple Method Simple Method Simple Method Simple Method
21
Calculation method for design volume
Simple Method
ADDITIONAL INFORMATION
22
iPlease use this space to provide any additional information about the
drainage area(s):
' 0
to remain.
0
L0 Other" BUA in line 12 consists of existing buildings and existing pavement
t I
"N,te that runoff volume match methodology is being utilized for project. —J

INFILTRATION SYSTEM
1 1 Drainage area number 2"
2 1 Minimum required treatment volume (cu ffl I 29U280 ef 269-34
3
is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Y"
4
Is the SCM located away from contaminated soils?
Yes
Yes
5
What are the side slopes of the SCM (H:V or enter "Vertical"for
trenches)?
3:1
3:1
6
Does the SCM have retaining walls, gabion walls or other
engineered side slopes?
No
No
7
Are the inlets, outlets, and receiving stream protected from erosion
( 1 0-Year storm)? — i - of fh-
Is there an overflow or bypass or inflow volume in excess a
deslan volume?
What is the method for dewatering fh—e SCIVI for maintenance?
Yes
Yes
8
Yes
Yes
9
Pump (preferred)
Pump (pro
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)?
Yes
Yes
13
14
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC (1 OV
Is there an O&M Agreement that complies with General MDC (11)?
N/A
N/A
Yes
Yes
1-5
Is—therean O&M Plan that complies with General MDC (112)?
Yes
Yes
16
Woes the SCM follow the device specific IVIDC?
Yes
Yes
17
lWas the SCM deslqned bv an NC licensed Drofessional?
Yes
18 [Proposed slope of the subgrade surface 0% 0%
19 [Are terraces or baffles provided? No No
20 [Type of pretreatment: Forebay Forebay
SOUS Data
21
Was the soil investigated in the footprint and at the elevation of the
infiltration system?
Yes
Yes
22
SHWT elevation (fmsi)
456.50
440.00
23 _
Depth to SHWT per soils report (in)
96.00
96.00
24
Ground elevation at boring in soils report _(fmsl)
473.50
448.00
25
Is a detailed hydrogeologic study attached if the separation is
lbetween 1 and 2 feet?
N/A
N/A
26
JSoil infiltration rate (in/hr)
0.50
1 0.50
27
lFactor of safety (FS) �2 is recommended):
2.00
J_ 2.00
Tranchas Oniv
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 �Te, if applicable
0
40
Stone porosity (%)
41
1
Is stone free of fines?
42
Is the stone wrapped in Reotextile fabric?
43
Has at least one inspection Port been p—licier"?
vaiumeslurawaown
44 1 Design volume of SCM
45 Time to draw down (ho
ADDITIONAL I NFORMATION
46 Please use this space t
Ithe infiltration system(s
any
Note that required treatment volume in Line 2 is annual treatment volume required
1(runoff volume match methodol2g�
Infiltration 3 9:18 AM 6/17/2021