SW6210201_Signed EZ Form_20210416

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1
1 Project Name
Ryan's Run
2
Project Area (ac)
35.777
3
Coastal Wetland Area ac
-
4
Surface Water Area (ac)
1.524
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
30
8
Will the vegetated setback remain vegetated?
Yes
9
If BUA is proposed in the setback, does it meet NCAC 02H.1003 4 c-d ?
No
10
Is streambank stabilization proposed on this project?
No
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 LS-FS
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22
Dry Pond
0
23
StormFilter
0
24
Silva Cell
0
25
Bay -filter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Carlo Pardo, PE
28
Organization:
Triangle Site Design, PLLC
29
Street address:
4004 Barrett Drive, Suite 101
30
City, State, Zip:
Raleigh, NC 27609
31
Phone number(s):
919-553-6570
32
1 Email:
[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.
C A R p��%.,,.
SEAL
051571 -
• eNGINE�-�o' O
a � �':;�-4
Signature of Designer
Date �T

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
2
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
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
4
T e of SCM
-
Infiltration Basin
Infiltration Basin
5
Total drainage areas ft
1533633
979923
553710
6
F8
Onsite drainage areas ft
1352690
955530
397160
7
Offsite drainage areas ft
180943
24393
156550
Total BUA in project (sq ft
496534
242378 sf
254156 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
315591
217985 sf
97606 sf
10permitting)
New BUA not on subdivided lots (subject to
s
11
Offsite BUA (sq ft
180943
24393 sf
156550 sf
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
Sidewalk (sq ft
14490
12026 sf
2464 sf
Roof (sq ft
220000
148000 sf
72000 sf
Roadway s ft
81101
57959 sf
23142 sf
- Future (sq ft
- Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
subdivided lots s ft
14
New infiltrating permeable pavement not on
subdivided lots s ft
15
Existing BUA that will remain (not subject to
permitting)s ft
16
ExistingBUA that is alreadypermitted s ft
17
ExistingBUA that will be removed s ft
18
Percent BUA
32%
25%
46%
19
Design storm inches
1.0 in
1.0 in
20
Design volume of SCM cu ft
22261 cf
21369 cf
21
Calculation method for design volume
Simple Method
Simple Method
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

INFILTRATION SYSTEM
1 Drainage area number 1 2
2 1 Minimum reouired treatment volume (cu ft) 22261 cf 21369 cf
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
4 1
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
10- ear storm)?
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
Yes
9
lWhat 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)?
Yes
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC 10 ?
N/A
N/A
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
lWas the SCM designed by an NC licensedprofessional?
Yes
Yes
INFILTRATION
SYSTEM MDC FROM 02H .1051
18
Proposed slope of the subgrade surface (%)
0% 0%
19
Are terraces or bafflesprovided?
No No
20
Type ofpretreatment:
Forebay Forebay
I Cnrre nM-n
21
Was the soil investigated in the footprint and at the elevation of the
infiltrations stem?
Yes
Yes
22
SHWT elevation (fmsl)
292.50
300.00
23
Depth to SHWT per soils report (in)
90.00
96.00
24
Ground elevation at boring in soils report (fmsl)
300.00
308.00
25
Is a detailed hydrogeologic study attached if the separation is
between 1 and 2 feet?
Yes
Yes
26
ISoil infiltration rate (in/hr)
18.00
18.00
27
1 Factor of safety (FS) (2 is recommended):
2.00
2.00
I Flavafinnc
29
Bottom elevation (fmsl)
299 ft
307 ft
30
Storage elevation (fmsl
301. ft
309. ft
31
Bypass elevation (fmsl)
301.4 ft
310.9 ft
For Basins Only
32 jBottorn surface area(ft) 19495 ft 11530 ft
33 IStorage elevation surface area(ft) 24770. ft 14290. ft
Cnr Tranrhaa r)n/v
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 porosity (%)
41
Is stone free of fines?
42
Is the stone wrapped in geotextile fabric?
43
Has at least one inspection port been provided?
VOlUmes/Drawdown
44 IDesign volume of SCM (cu ft) 22261 cf 21369 cf
45 1 Time to draw down hours 72 hrs 72 hrs
ADDITIONAL INFORMATION
46 Please use this space to provide any additional information about the
infiltration system(s):
Infiltration 1 2:17 PM 4/14/2021