SW1220701_Supplement-EZ Form_20220805

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name All About Plumbing Building Addition
2 Project Area (ac) 3.15
3 Coastal Wetland Area (ac) 0
4 Surface Water Area (ac) 0
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)
0
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 project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
1
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
Bayfilter
0
26
Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
J. David McCutchen, P.E.
28
Organization:
McCutchen Engineering Associates, PC
29
Street address:
898 West Saint John Street
30
City, State, Zip:
Spartanburg, SC 29301
31
Phone number(s):
864-582-0585
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.
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nRAINAGE AREAS
1
IIs this a high density project?
Yes
2
If so, number of drainage areas/SCMs
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
FORMS LOADED
DRAINAGE AREA INFORMATION Entire Site 1
4 1 Type of SCM Bio-Retention Cell i
5
JTotal drainage area (sq ft
137,214
6
Onsite drainage area (sq ft
137,214
7
Offsite drainage area(sq ft)
0
8
Total BUA in project (sq ft
57935 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft
N/A
10
New BUA not on subdivided lots (subject to
permitting) s
14375 sf
11
Offsite BUA (sq ft
N/A
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
25700 sf
Sidewalk (sq ft
N/A
Roof (sq ft
6534 sf
Roadway (sq ft)
N/A
_
Future (sq ft)
N/A
Other, please specify in the comment box
below (sq ft)
N/A
13
New infiltrating permeable pavement on
subdivided lots (sq ft
N/A
14
New infiltrating permeable pavement not on
subdivided lots (sq ft)
N/A
15permitting)
Existing BUA that will remain (not subject to
s ft
43560 sf
16
Existing BUA that is already permitted (sq ft
43560 sf
17
Existing BUA that will be removed (sq ft
N/A
18
Percent BUA
42%
19
Design storm inches
1.0 in
20
Design volume of SCM (cu ft)
3751 cf
21 Calculation method for design volume
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):
Bio-retention pond was utilized for stormwater runoff and pollutant control

BIORETENTION CELL
1 Drainage area number 1
2 Minimum re wired treatment volume cu ft) 3413 c
GENERAL MDC FROM 0214 .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
4
Is the SCM located away from contaminated soils?
Yes
5
What are the side slopes of the SCM (H:V)?
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 erosion
(10-year storm)?
Yes
8
Is there an overflow or bypass for inflow volume in excess of the
design volume?
Yes
9
lWhat is the method for dewatering the SCM for maintenance?
Drawdown Orifice
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 drainage easement comply with General MDC (9)?
Yes
13
If the SCM is on a single family lot, does (will?) the plat comply with
General MDC (10)?
N/A
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 6UM designedy an NC licensedprofessional?
Yes
BIORETENTION
CELL MDC FROM 02H .1052
18
SHWT elevation (fmsl)
N/A
19
Bottom of the bioretention cell (fmsi)
999.00
20
Pending depth of the design storm (inches)
12 in
21
Surface area of the bioretention cell (square feet)
3890 sf
22
Design volume of SCM (cu ft)
3751 cf
23
Is the bioretention cell used for peak attenuation?
No
24
Depth of peak attenuation over planting surface (in)
in
25
Height of peak attenuation outlet above the planting surface (in)
in
26
Infiltration rate of the in situ soil (inch/hour)
3 in/hr
27
Diameter of the underdrain pipes (if applicable)
4 in
28
Does the design include Internal Water Storage (IWS)?
Yes
29
if so, elevation of the top of the IWS (fmsl)
1001.5
30
Elevation of the planting surface (fmsl)
1003
31
What type of vegetation will be planted? (grass, trees/shrubs,
other)?
Grass
32
Media depth (inches)
36 in
33
Percentage of medium to coarse washed sand by volume
80%
34
Percentage of fines (silt and clay) by volume
10%
35
Percentage of organic matter by volume
10%
36
Type of organic material
Pine Bark Fines
37
Phosphorus Index (P-Index) of media (unitless)
<50
38
Will compaction be avoided during construction?
Yes
39
Will cell be maintained to a one inch/hour standard?
Yes
40
Depth of mulch, if applicable (inches)
N/A
41
Type of mulch, if applicable
N/A
42
How many clean out pipes are being installed?
4
43
ADDITIONAL
44
Type of pretreatment that will e used:
INFORMATION
Please use this space to provide any additional information about the
bioretention cell(s):
FORrB77
Bioretention 1 5:31 PM 7/19/2022