SW3181201_Supplement-EZ Form_20220407

SUPPLEMENT-EZ COVER PAGE
FORMS LOADED
PROJECT INFORMATION
1 Project Name
Rob Wallace Park - Phase IIB
re 2 Project Aa ac) _ —
148.36 _
3 Coastal Wetland Area ac
0
4 Surface Water Area (ac
_
0
5 Is this project High or Low Density?
Low
6 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 ? NIA
10 Is streambank stabilization proposed on this project? No
NUMBER AND TYPE OF SCMs:
11 1 Infiltration System 0
12
Bioretention Cell
0
13
Wet Pond
0
14
Stormwater Welland
_ 0
0
0
f 0
0
0
0
0
0
0
_ 0
0
0
15
Permeable Pavement
16
Sand Filter
17
Rainwater Harvesting RWH
18
Green Roof
19
Level 5 reader -Filter Strip LS-FS
20
Disconnected Impervious Surface (DIS)
21
Treatment Swale
22
Dry Pond
23
Storn iter
24
Silva Cell
25
Bayfilter
26
Filterra
FORMS LOADED
ESIGNER CERTIFICATION
27 Name and Title:
Matthew Blackmon, Project Engineer
a Organization:
Alfred Benesch & Associates
29 Street address:
2359 Perimeter Pointe Parkway, Suite 350
30 City, State Zip:
Charlotte, NC 28208
31 Phone numbers :
7048315686
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.
A
�E
Signature of Design
fJate

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
Is allipart of this project subject to previous rule
5 versions? No
FORMS LOADED
DRAINAGE AREA INFORMATION
4 Type of SCM
Entire Site LD 1
128502
5
ITotal drainage area (sq ft
6
Onsite drainage areas ft
128502
0
28475 sf
7
Offsite drainage area (sq ft
8
Total BUA in prolect (sq ft
9
New BUA on subdivided lots (subject to permitting)
(sq ft
10
New BUA not on subdivided lots (subject to
perimittin s
11
Offsite BUA(sq ft
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
10367 sf
4573 sf
3513 sf
10022 sf
Sidewalk (sq ft
Roof (sq ft
Roadway s ft
Future (sq ft
Other, please specify in the comment box
below (sq ft
13
New infiltrating permeable pavement on
subdivided lots (sq ft
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
15
Existing BUA that will remain (not subject to
ermitting) (sq ft
16
Existing BUA that is already permitted (sq ft
403913 sf
6462608 sf
17 ExistingBUA that will be removed (sq ft)
18 Percent BUA 7%
19 Design storm (inches)
20 Design volume of SCM (cu ft)
21 Calculation method for design volume
ADDITIONAL INFORMATION
Please use this space to provide any additional information about the
22 drainage area(s):

LOW DENSITY
DESIGN
REQUIREMENTS FOR LOW DENSITY PROJECTS FROM 02H .1003
Is project below density thresholds set forth in the applicable stormwater rule? Yes
1
2
Does project maximize dispersed Flow and minimize channelization of flow? Yes
3
Has the use of piping been minimized per. 1 003l Yes
4
Side slopes of the vegetated conveyances 31
Maximum velocity in the vegetated conveyances during the 10-year storm? 4 12
Are curb outlet swales proposed? No
Maximum longitudinal slope of curb outlet swale(s) {%)
Bottom width of curb outlet swale(s) (feet)
5
6
7
8
9
Maximum side slope of curb outlet swale(s) (H:V)
10
Minimum length of curb outlet swale(s) (feet) _
11
Are treatment swales used instead of curb outlet swales?
12
Is stormwater released at the edge of the setback as dispersed flow? NIA
13
Have stormwater outlets been designed to prevent downslope erosion? Yes
14
Are variations to rule 1003 proposed'
ADDITIONAL
INFORMATION
15
iPlease use this space to provide any additional information about this law density proieet
This project involves the construction of a playground, restroom, and picnic shelters near the recently completed Rob Wallace
Park Phase 2 improvements. In addition to the structures, a new 23 space parking lot to serve the proposed amenities, as well
as several short crushed concrete walking trail connectors. The project will be constructed in a single phase starting with the
construction of the structures and playground and ending with the parking lot construction. During construction, there will also
be an extension of the private water main that parallels the park road to serve a new hydrant and restroom.
Swale
#
Drainage
Area
ac
BUA
(ac)
Pervious
area
ac
C
q
(S)
Sloe
p
N
V ,,s„,
(fps)
V,a,
(fps)
Flow depth
Vt)
1
Existing
S eles
From
Previous
Permit
_
2
0.99
0.61
0.38
1
5.29
2.75
5.00
3.53
0,50
3
0.54
0.30
0.24
1
2.73
2.50
5.00
2.28
3,00
4
1,70
0.10
1.60
0
4.41
1.80
5.00
2.66
041
6
Proposed
Shales
7
1.76
0.03
1.73
36
1 7.79
3.74
5.00
4.84
0.53
8
0.51
0.14
0.37
52
2.25
1.88
5.00
2.39
0.35
9
0.37
0.20
0.17
67
2.19
2.89
5.00
1 2.56
026
10
0.48
0-13
0.35
81
2.08
3.58
5.00
3.02
0,27
11
2.03
0,26
1.77
43
9.02
2.32
5.OD
4.12
0.66
12
13
CLEAN
WATER
SWALE
14
0.70
0.00
0.70
36.00
3.84
3.47
5.00
3.01
0.41
15
16
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