SW6210903_Supplement-EZ Form_20210914

SUPPLEMENT-EZ COVER PAGE
FORM5LOADED
I=i0I11told IZIV] 0i7ir_ 114121
1 JProject Name Carolina Crossing
2 JPrqject Area (ac) j 44.436
3 Coastal Welland Area (ac
4 Surface Water Area (ac)_-_
5 is this project Hig h or Low Density?_ _ _ Hi I
6 Does this project use an off -site SCM? No
'COMPLIANCE WITH 02H .10084)
7 Width of vegetated setbacks provided (feet}
_ NIA
NIA
8 Will the vegetated setback remain vegetated?
8 If BUA is prapDsed in the setback, does it meet NCAC D2H.1003 4 c-d ?
No
10 -Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMS:
11
Infiltration System
Bioretention Cell TT _ --—
1
12
0
13
Wet Pond
Stormwater Wetland
0
14
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) _ _
Treatment Swale
0
21
0
22
❑ Pond
0
0
23
StormFilter
24
Silva Cell
0 _ —
25
Ba filter _
0
26
IFilterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Carlo Pardo, PE
28
Organization:
Triangle Site Design, PLLC
29
Street address: J
4004 Barrett Drive, Suite 101
30
City, State, Zip:
Raleigh, NC 27609_
31
Phone numbers :
919-553-6570
32
EmaiL
cpardoagtrianglesitedesign.com
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 knowiedge 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.
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Signature of Designer
Date

DRAINAGE AREAS
1
Is this a high dens4y pUo ect?
Yes
2
If so, number of drainage areaslSCMs
_
1
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
FORM5t0ADEb
DRAItVAGE AREA INFORMATION M
Entire Site
4
Type of SCM
-
Infiltration Basin
5
Total drainage area (sq ft
1935619 sf
1504315
6
Onsite drainage area Jsq ft
1935619 sf
1504315
7
Offsite drainage area (sq ft
8
Total BUA in project (sq ft
395036 sf
395036 sf
9
New BUA on subdivided lots (subject to permitting)
1 (sq ft
1 0
h11
New eUA not on subdivided lots (subject to
ermittin s
Offslte BUA (sq tt
12
Breakdown of new BUA not on subdivided lots:
Parkin SN ft
Sidewalk (sq ft)
20006 sf
20008 sf
Roof (sq ft
256000 sf
256000 sf
Roadway s ft
119030 sf
119030 sf
Futures ft
Other, please specify in the comment box
below (sq ft
13 1
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on��
subdivided lots (sq f1
15
Existing BUA that will remain (not subject to
ermittin s ft)
16
Existing BUA that is already permitted (sq ft
j'
17
Existing BUA that will be removed (sq ft
4028 sf
4028 sf
118
Percent BUA
26%
19
Design storm inches
1.0 in
20
Design volume of SCM (cu it)
35896 cf
21
Calculation method for design volume
Simple Method
ADDITIONAL INFORMATION
r
k
22
Please use this spare to provide any additional information about the
drainage area(s),
_

INFILTRATION SYSTEM
�1 Drainage area number i 1
2 ,Minimum required treatment volume (ru ft) T 358c
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
4 1
Is the SCM located away from contaminated soils?
Yes
5
What are the side slopes of the SCM (KV or enter "Vertical' for
trenches)?
3:1
6
Does the SCM have retaining walls, gabion walls or other engineered
side slopes?
No _
7
Are the inlets, outlets, and receiving stream protected from eroston
1 D- ear storm)?
Yes
8
Is there an overflow ar bypass for inflow volume in excess of the
desi n volume?
Yes
9
lWhat is the method for clewatering the SCM for maintenance?
Pump (preferred)
10
If applicable, will the SCM be cleaned out after construction?
Yes
11
Does the maintenance access comply with General MDC (8)?
Yes
12
Does the drains a easement co m ply with General MDC (9)?
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC 10 ?
NIA
14
Is there an O&M Agreement that complies with General MDC (11)?
Yes
15
Is there an O&M Plan that complies with General MDC (12)?
Yes
16
Does the SCM follow the device specific MDC?
Yes
17
Was the SCM designed U an NC licensed rotessional?
Yes
NFILTRATION
SYSTEM Mnr FROM 02H _1A51
18
Proposed slope of the subgrade surface (%)
—
0%
19
jAre terraces or bafflesprovided?
No
20
IType of pretreatment:
Forebay
I Sods Data
21
Was the soil investigated in the footprint and at the elevation of the
Infiltrations stem?
Yes
22
SHWT elevation (fmsl)
326.00
23
Depth to SHWT per soils report (in)
168.0o
24
Ground elevation at boring in soils report (fmsl)
340.00
25
Is a detailed hydrogeologic study attached if the separation is
between 1 and 2 feet?
NIA
26
Soil infiltration rate (inlhr)
4.00
27
Factor of safer (FS) (2 is recommended):
2.00
Elevations
29
Bottom elevation (fmsl)
333 ft
30
Storage elevation (fmsl)
335. ft
31
Bypass elevation (fmsl)
338.1 ft
For Basins Oni
32 Bottom surface area ft2
27255 ft
33 1 Storage elevation surface area (ft)
31810. tt
For Trenches 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
Slone 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?
VOiumeSlDraWdown
44 1 Design volume of SCM (cu ft) 35896 cf
45 ITime to draw down (hours) 72 hrs
ADDITIONAL INFORMATION
46 Please use this space to provide any additional information about the
infiltration system(s):
Infiltration 1 11:04 AM 8/2/2021