SW3191201_Supplement Form_12/5/2019

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Circle K Denver (Unity Church Rd)
2 Project Area ac 2.35
3 Coastal Wetland Area ac 0
4 Surface Water Area (ac) 0
5 Ils this project High or Low Density? High
6 1 Does this protect use an off -site SCM? No
COMPLIANCE WITH 02H .1003(4)
7
Width of ve etated setbacks provided feet
10
8
Will the vegetated setback remain vegetated?
Yes
9
Is BUA other that as listed in .1003 4 c-d out of the setback?
Yes
10
1 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
1
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
Ba filter
0
26
1 Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Kai Burk, Principal
28
Organization:
Bowman Consulting
29
Street address:
950 North Point Parkway, Suite 200
30
City, State, Zip:
Alpharetta, GA 30005
31
Phone numbers :
678 374-6687
32
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.
Seal
Signature of Designer
Date

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
AREA INFORMATION
Entire Site
1
2
4
T pe of SCM
Bioretention
Sand Filter
5
Total BUA in project (sq ft
15142 sf
55918 sf
6permitting)
New BUA on subdivided lots (subject to
s ft
15142 sf
41833 sf
7permitting)
New BUA outside of subdivided lots (subject to
sf
sf
sf
8
Offsite - total area (sq ft
sf
14085 sf
9
Offsite BUA (sq ft
sf
14085 sf
10
Breakdown of new BUA outside subdivided lots:
Parking (sq ft
sf
sf
Sidewalk (sq ft
sf
sf
Roof (sq ft
sf
sf
Roadway s ft
sf
sf
Future (sq ft
sf
sf
Other, please specify in the comment box
below (sq ft
sf
sf
11
New infiltrating permeable pavement on
subdivided lots (sq ft
sf
sf
12
New infiltrating permeable pavement outside of
subdivided lots (sq ft
sf
sf
13
Exisitng BUA that will remain (not subject to
ermitting) (sq ft
sf
sf
14
Existing BUA that is already permitted (sq ft
sf
sf
15
Existing BUA that will be removed (sq ft
sf
sf
16
Percent BUA
63%
66%
17
Design storm inches
1 in
1 in
18
Design volume of SCM cu ft
1240 cf
3415 cf
19
Calculation method for design volume
Simple
Simple
ADDITIONAL INFORMATION
20
Please use this space to provide any additional information about the
drainage area(s):

BIORETENTION CELL
1 1 (Drainage area number
Design volume of SCM (cu ft)
ERAL MDC FROM 02H .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
What 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)?
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
1 Does the SCM follow the device specific MDC?
Yes
17
lWas the SCM designed by an NC licensed professional?
Yes
BIORETENTION
CELL MDC FROM 02H .1052
18
SHWT elevation (fmsl)
831.00
19
Bottom of the bioretention cell (fmsl)
845.00
20
Ponding depth of the design storm (inches)
1 in
21
Surface area of the bioretention cell (square feet)
1240 sf
22
Design volume of the bioretention cell (cubic feet)
1240 cf
23
Ps the bioretention cell used for peak attenuation?
Yes
24
Depth of peak attenuation over planting surface (in)
846 in
25
Height of peak attenuation outlet above the planting surface (in)
2 in
26
Infiltration rate of the in situ soil (inch/hour)
27
Diameter of the underdrain pipes (if applicable)
28
Does the design include Internal Water Storage (IWS)?
No
29
if so, elevation of the top of the IWS (fmsl)
30
Elevation of the planting surface (fmsl)
845
31
What type of vegetation will be planted? (grass, trees/shrubs, other)?
Grass
32
Media depth (inches)
24 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
37
Phosphorus Index (P-Index) of media (unitless)
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)
2 in
41
Type of mulch, if applicable
shredded
hardwood
42 How many clean out pipes are being installed?
43 IType of pretreatment that will be used:
ADDITIONAL INFORMATION71
Please use this space to provide any additional information about the
44 bioretention cell(s):
2
grass and gravel
Bioretention 1 2:27 PM 11/27/2019

SAND FILTER
1 Drainage area number A
2 juesign volume of SCM (cu ft) 3415 sf
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?
No
9
What 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
1 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)?
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 by an NC licensed professional?
Yes
(SAND FILTER MDC FROM 02H _905B
18
SHWT elevation (fmsl)
831
19
Type of sand filter (open or closed)
Open
20
If closed, will the filter will be pre -cast or pour -in -place?
21
If closed, top of grate elevation (fmsl)
22
Is this sand filter designed to attenuate peak flows?
Yes
Sediment Chamber
23
Volume that can be retained in the sediment chamber (cubic feet)
6721 cf
24
Will there be a permanent pool in the sediment chamber?
No
25
Bottom of the sediment chamber (fmsl)
844.00
26
Area of the sediment chamber (square feet)
2889 sf
27
Physical depth of the sediment chamber (inches)
48 in
28
Ponding depth in the sediment chamber, above any permanent pool
(inches)
1 41 in
29
jElevation of top of weir between chambers (fmsl)
1 847.9
Sand Chamber
30
Volume that can be retained in the sand chamber (cubic feet)
13102 cf
31
Bottom of the sand chamber (fmsl)
841.50
32
Area of the sand chamber (square feet)
1683 sf
33
Physical depth of the sand chamber (inches)
48 in
34
Ponding depth in the sand chamber, above any permanent pool
(inches)
41 in
35
Elevation of the bypass device (fmsl)
36
Type of bypass device
37
Mechanism for distributing flow over the sand surface
underdrain
38
Sand specification for sand chamber
ASTM C33
39
Depth above underdrain pipe (inches)
18 in
40
Will the media be maintained to drain at least two inches per hour at
the sand surface?
Yes
41
Is at least one clean -out pipe provided at the low point of each
junderdrain line?
Yes
42
lWill clean -out pipes be capped?
Yes
ADDITIONAL
INFORMATION
43
Please use this space to provide any additional information about the
ISand Filter(s):
Sand Filter 1 2:26 PM 11/27/2019