SW4230101_Supplement-EZ Form_20230510

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT
INFORMATION
1
Project Name
E M Holt ES On -site Queuing Improvements
2
Project Area ac
30.2
3
Coastal Wetland Area ac
0
4
Surface Water Area ac
0
5
Is this ro'ect High or Low Density?
Low
6
1 Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H.1003(4)
7
Width of vegetated setbacks provided feet
30
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
Is streambank stabilization proposed on this project?
No
NUMBER AND TYPE OF SCMs:
11
Infiltration System
12
Bioretention Cell
13
Wet Pond
14
Stormwater Wetland
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting (RWH)
18
Green Roof
19
Level Spreader -Filter Strip (LS-FS)_
20
Disconnected Impervious Surface (DIS)_
21
Treatment Swale
22
Dry Pond
23
StormFilter
24
Silva Cell
25
Bayfilter
26
Filterra
FORMS LOADED
Name and Title:
Street address:
City, State, Zip:
Phone number(
Email:
Blake Hall. PLA. PE. LEED AP BD+C
5410 Trinity Road, Suite 102
Raleigh, NC, 27607
919-866-4933
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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DRAINAGE AREAS
1
Is this a high 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
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
DRAINAGE AREA INFORMATION
Entire Site
LD 1
4
Type of SCM
Vegetated Swale
Vegetated Swale
5
Total drainage area (sq ft)
1,315,512
1,315,512
6
Onsite drainage area (sq ft)
1,315,512
1,315,512
7
Offsite drainage area (sq ft)
0
0
8
Total BUA in project (sq ft)
251486 sf
251486 sf
9
New BUA on subdivided lots (subject to permitting)
(sq ft)
N/A
N/A
10
New BUA not on subdivided lots (subject to
permitting) (so
79583 sf
79583 sf
11
Offsite BUA (sq ft)
N/A
N/A
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft)
32946 sf
32946 sf
Sidewalk (sq ft)
3444 sf
3444 sf
Roof (sq ft)
sf
sf
Roadway (sq ft)
43193 sf
43193 sf
Future (sq ft)
N/A
N/A
Other, please specify in the comment box below
(sq ft)
N/A
N/A
13
New infiltrating permeable pavement on subdivided
lots (sq ft)
N/A
N/A
14
New infiltrating permeable pavement not on
subdivided lots (sq ft)
N/A
N/A
15
Existing BUA that will remain (not subject to
permitting) (sq ft)
171903 sf
171903 sf
16
Existing BUA that is already permitted (sq ft)
sf
sf
17
Existing BUA that will be removed (sq ft)
13293 sf
13293 sf
18
Percent BUA
19%
19%
19
Design storm (inches)
1.0 in
1.0 in
20
Design volume of SCM (cu ft)
N/A
N/A
21
Calculation method for design volume
N/A
N/A
ADDITIONAL INFORMATION
22
Please use this space to provide any additional information about the
drainage area(s):

LOW DENSITY
DESIGN REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 021-11.1003
1
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?
3.37
6
Are curb outlet swales proposed?
Yes
7
Maximum longitudinal slope of curb outlet swale(s) (%)
3.2
8
Bottom width of curb outlet swale(s) (feet)
2 ft
9
Maximum side slope of curb outlet swale(s) (H:V)
31
10
Minimum length of curb outlet swale(s) (feet)
70.0 ft
11
Are treatment swales used instead of curb outlet swales?
No
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
1 Please use this space to provide any additional information about this low density project:
The maximum achievable length for PDD8 is 70-ft. This curb outlet swale is located to improve existing drainage issues to direct
flow to the existing drop inlet Al instead of sheet flowing across the proposed queue lanes to PDD2.
The curb outlet swales are: PDD2, PDD3 & PDD8