SW3220305_Supplement-EZ Form_20220325

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name Rocky River WWTP Phase 3 Expansion
2 Project Area ac 234.86
3 Coastal Wetland Area ac N/A
4 Surface Water Area ac 6.6
5 Is this project High or Low Density? Low
6 Does this protect use an off -site SCM? No
COMPLIANCE WITH 02H .1003(4)
7
Width of ve etated setbacks provided feet
30ft(per 02H .1017
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 ?
N/A
10
I Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration S stem
0
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
lBayfilter
0
26
1 Filterra
0
FORMS LOADED
DESIGNER CERTIFICATION
27
Name and Title:
Kim Devendorf, PE
28
Or anization:
Brown and Caldwell
29
Street address:
309 East Morehead Street, Suite 160
30
City, State, Zip:
Charlotte, NC 28202
31
Phone numbers :
315 401-3634
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.
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Date
02/14/22 9:57 AM

DRAINAGE AREAS
1
Is this a hi h density project?
No
2
If so, number of drainage areas/SCMs
0
3
Does this project have low density areas?
Yes
4
If so, number of low density drainage areas
5
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
AREA INFORMATION
Entire Site
LD 1
LD 2
LD 3
LD 4
LD 5
4
T e of SCM
N/A
Swale
Swale
Swale
Swale
Swale
5
Total draina a area s ft
10230502
100302.00
69932.00
2450.00
21885.00
20184.00
6
Onsite draina a areas ft
10230502
100302.00
69932.00
2450.00
21885.00
20184.00
7
Offsite draina a area s ft
N/A
N/A
N/A
N/A
N/A
N/A
8
Total BUA in project (sq ft
637900 sf
N/A
2258 sf
1300 sf
3475 sf
4840 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
N/A
N/A
N/A
N/A
N/A
N/A
10permitting)
New BUA not on subdivided lots (subject to
s
64900 sf
N/A
2258 sf
1300 sf
N/A
N/A
11
10ffsite BUA (sq ft
N/A
N/A
N/A
N/A
N/A
N/A
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
N/A
N/A
N/A
N/A
N/A
N/A
Sidewalk (sq ft
2200 sf
N/A
N/A
N/A
N/A
N/A
Roof (sq ft
11800 sf
N/A
N/A
N/A
N/A
N/A
Roadway s ft
44800 sf
N/A
2258 sf
1300 sf
N/A
N/A
Future (sq ft
40600 sf
N/A
N/A
N/A
N/A
N/A
Other, please specify in the comment box
below (sq ft
6100 sf
N/A
N/A
N/A
N/A
N/A
13
New infiltrating permeable pavement on
subdivided lots (sq ft
N/A
N/A
N/A
N/A
N/A
N/A
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
N/A
N/A
N/A
N/A
N/A
N/A
15permitting)
Existing BUA that will remain (not subject to
s ft
563516 sf
N/A
N/A
N/A
3475 sf
4840 sf
16
Existing BUA that is already permitted (sq ft
N/A
N/A
N/A
N/A
N/A
N/A
17
Existing BUA that will be removed (sq ft
9484 sf
N/A
N/A
N/A
N/A
N/A
18
Percent BUA
6%
N/A
3%
53%
16%
24%
19
Design storm inches
2.3 in
2.3 in
2.3 in
2.3 in
2.3 in
2.3 in
20
Design volume of SCM cu ft
N/A
N/A
N/A
N/A
N/A
N/A
21 Calculation method for design volume N/A N/A N/A N/A N/A N/A
DDITIONAL INFORMATION
Please use this space to provide any additional information about the
r22drainage area(s):
"Other" impervious area includes concrete boxes, vaults, and pads for
electrical and wastewater processes

LOW DENSITY
DESIGN
1
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
Is project below density thresholds set forth in the applicable stormwater rule?
Yes
2
Does project maximize dispersed flow and minimize channelization of flow?
Yes
3
Has the use of piping been minimized per .1003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
31
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
2.51
6
lAre curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (%)
N/A
8
Bottom width of curb outlet swale(s) (feet)
N/A
9
Maximum side slope of curb outlet swale(s) (H:V)
N/A
10
Minimum length of curb outlet swale(s) (feet)
N/A
11
Are treatment swales used instead of curb outlet swales?
Yes
12
1 Is stormwater released at the edge of the setback as dispersed flow?
Yes
13
1 Have stormwater outlets been designed to prevent downslope erosion?
Yes
14
JAre variations to rule .1003 proposed?
No
ADDITIONAL
INFORMATION
15
Please use this space to provide any additional information about this low density project:
The site has existing stormwater networks that will be utilized by directing drainage to existing networks. The existing networks
discharge to vegetated swales that are outside the vegated buffer of Rocky River.