SW6221003_Supplement-EZ Form_20230418

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FORMS -LOADED
tOJECT INFORMATION
1 Project Name 1 Carolina Wildlife Conservation Park Parking Lot
45.85
2 Project Area ac
0
3 Coastal Wetland Area ac
0
4 Surface Water Area ac
5 Is this ro'ect Hi h or Low Densi ? Low
No
6 Does this project use an off -site SCM?
OMPLIANCE WITH 02H .1003(4)
..
_7 } Width of ve _etated setbacks provided (feed 30
_8 W ill the vegetated setback remain ve etated? N/A _
9 If BUA is ro osed in the setback, does it meet NCAC 02H.1003 4 c-d ? N/A
10 Is streambank stabilization proposed on this project? No
UMBER AND TYPE OF SCMs:
11
Infiltration System
12
Bioretention Cell
Pond
13
14
Wet
Stormwater Wetland
Permeable Pavement
Sand Filter
Rainwater Harvestin RWH
Green Roof
Level Spreader -Filter Strip LS-FS
Disconnected Impervious Surface DIS
Treatment Swale
Dry Pond
StormFilter
Silva Cell
Ba titer
Ifilterra
--
15
16
17
18
19
20
21
22
23
24
25
2B
FORMS -LOADED
ESIGNER CERTIFICATIO_ N
Zak Shipman PE -President
27 Name and Title:
Shipman EngineerincPLLC
28
Or anization:
137 Middlegreen Place
29
Street address:
Holly Springs, NC 27540
30
city, state, Zip:
Phone number(s�
k 919.900.0006
[e-mail]
31
32
Email:
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.
\\�i CiAR04/'��/I,
a SEAS
035027 .
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Signature of Designer
,2 Z -3
Date

DRAINAGE AREAS
1
Is this a high density project?
No
2
If so, number of drainage areas/SCMs
0
3
Does this roiect have low densit 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
AREA INFORMATION
Entire Site
LID 1
4
T pe of SCM
n/a
n/a
5
Total drainage area (sq ft
1997226
1997226
6
Onsite drainage area (sq ft
1997226
1997226
7
Offsite drainage area (sq ft
0
0
8
Total BUA in project (sq ft
180522 sf
180522 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
sf
sf
10permitting)
New BUA not on subdivided lots (subject to
s
180522 sf
180522 sf
11
Offsite BUA (sq ft
12
1 Breakdown of new BUA not on subdivided lots:
Parking (sq ft
32549 sf
32549 sf
Sidewalk (sq ft
3156 sf
3156 sf
Roof (sq ft
37874 sf
37874 sf
Roadway s ft
Future (sq ft
Other, please specify in the comment box
below (sq ft
106943 sf
106943 sf
13
New infiltrating permeable pavement on
subdivided lots (sq ft
n/a
14
New infiltrating permeable pavement not on
subdivided lots (sq ft
n/a
15permitting)
Existing BUA that will remain (not subject to
s ft
sf
sf
16
Existina BUA that is already permitted (sq ft
sf
17
Existing BUA that will be removed (sq ft
sf
18
Percent BUA
9%
9 0
19
Design storm inches
n/a
n/a
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):
Other impervious is for dumpster pad and concrete apron in parking lot
area, plus gravel access paths in zoo area (previously constructed).

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. 1 003(2)(c)?
Yes
4
Side slopes of the vegetated conveyances (H:V)
3H:1 V
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
5.01
6
Are curb outlet swales proposed?
No
7
Maximum longitudinal slope of curb outlet swale(s) (% )
8
Bottom width of curb outlet swale(s) (feet)
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?
N/A
13
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:
Swale 1 exceeded the allowable velocity with simple vegetation, so we have indicated a TRIM liner which provides protection up
to 12 psf sheer stress and 20 fps velocity.