SW1200501_Supplement-EZ Form_20201009

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
2 Project Area ac
3 Coastal Wetland Area ac
4 Surface Water Area ac
5 Is this project High or Low Density?
6 Does this proiect use an off -site SCM?
I Car Rider Improvements Fairview Elementary
1.9
0
0
No
COMPLIANCE WITH 02H .1003(4)
7
Width of vegetated setbacks provided feet
N/A
8
Will the vegetated setback remain vegetated?
No
9
Is BUA other that as listed in .1003 4 c-d out of the setback?
No
10
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
0
12
Bioretention Cell
2
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
Filterra
0
26
0
FORMS LOADED
DESIGNER CERTIFICATION
27 1 Name and Title:
Street address:
Citv. State, Zip:
Scott Burwell, P.E.
55 Broad Street
Asheville, NC 28801
1 32 (Email: I Scott.Burwell(a)mcgillassociates.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 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.
N CARo
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Signature of Designer
Date
8/24/20

DRAINAGE AREAS
1
Is this a high density project?
Yes
2
If so, number of drainage areas/SCMs
2
3
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
1
2
4
Type of SCM
Bioretention Cell
Bioretention Cell
5
Total BUA in project (sq ft
25188 sf
6148 sf
19040 sf
6
New BUA on subdivided lots (subject to permitting)
(sq ft
7
New BUA outside of subdivided lots (subject to
permitting) (sf)
20473 sf
5479 sf
14994 sf
8
Offsite -total area (sq ft
9
Offsite BUA (sq ft)
10
Breakdown of new BUA outside subdivided lots:
- Parking (sq ft
- Sidewalk (sq ft
- Roof (sq ft
- Roadway s ft
20473 sf
5479 sf
14994 sf
- Future (sq ft
- Other, please specify in the comment box
below (sq ft
11
New infiltrating permeable pavement on
subdivided lots (sq ft
12
New infiltrating permeable pavement outside of
Isubdivided lots (sq ft
13permitting)
Exisitng BUA that will remain (not subject to
s ft
4715 sf
669 sf
4046 sf
14
Existing BUA that is already permitted (sq ft
15
Existing BUA that will be removed (sq ft
16
Percent BUA
30%
24%
33%
17
Design storm inches
3 in
3 in
3 in
18
1 Design volume of SCM cu ft
4147 cf
1099 cf
3048 cf
19
1 Calculation method for design volume
Simple
Simple
Simple
INFORMATION ;
IPlease use this space to provide any additional information about the I
20 drainage area(s):

BIORETENTION CELL
1 Drainage area number 1 2
2 IDesign volume of SCM (cu ft) 1099 cf 3048 cf
,GENERAL MDC FROM 02H .1050
3
Is the SCM sized to treat the SW from all surfaces at build -out?
Yes
Yes
4
Is the SCM located away from contaminated soils?
Yes
Yes
5
What are the side slopes of the SCM (H:V)?
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-year
storm)?
Yes
Yes
Yes
Yes
8
Is there an overflow or bypass for inflow volume in excess of the design
volume?
9
What is the method for dewatering the SCM for maintenance?
Drawdown Orifice
Drawdown Orifice
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)?
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
IBIORETENTION CELL MDC FROM 02H .1052
18
SHWT elevation (fmsl)
See Item #44
See Item #44
19
Bottom of the bioretention cell (fmsl)
2302.83
2266.83
20
Ponding depth of the design storm (inches)
12 in
12 in
21
Surface area of the bioretention cell (square feet)
1464 sf
2794 sf
22
Design volume of the bioretention cell (cubic feet)
1743 cf
3133 cf
23
Is the bioretention cell used for peak attenuation?
Yes
Yes
24
Depth of peak attenuation over planting surface (in)
24 in
24 in
25
Height of peak attenuation outlet above the planting surface (in)
12 in
12 in
26
Infiltration rate of the in situ soil (inch/hour)
27
Diameter of the underdrain pipes (if applicable)
6 in
6 in
28
Does the design include Internal Water Storage (IWS)?
Yes
Yes
29
1 if so, elevation of the top of the IWS (fmsl)
2304.5
2268.5
30
Elevation of the planting surface (fmsl)
2306.25
2270.25
31
What type of vegetation will be planted? (grass, trees/shrubs, other)?
Grass
Grass
32
Media depth (inches)
30 in
30 in
33
Percentage of medium to coarse washed sand by volume
75-85%
75-85%
34
Percentage of fines (silt and clay) by volume
8-15%
8-15%
35
1 Percentage of organic matter by volume
5-10%
5-10%
36
Type of organic material
Pine Bark Fines
Pine Bark Fines
37
Phosphorus Index (P-Index) of media (unitless)
<50
<50
38
Will compaction be avoided during construction?
Yes
Yes
39
Will cell be maintained to a one inch/hour standard?
Yes
Yes
40
Depth of mulch, if applicable (inches)
41
Type of mulch, if applicable
42
How many clean out pipes are being installed?
2
3
43
Type of pretreatment that will be used:
i N/A
N/A
INFORMATION
Please use this space to provide any additional information about the
44 bioretention cell(s):
was not found at depths of 10-15' below the surface at each SCM location.
Bioretention 3 9:44 AM 8/18/2020