SW3220201_Supplement-EZ Form_20220419

SUPPLEMENT-EZ COVER PAGE
FOR MSLOAULU
PROJECT INFORMATION
1 Project Name
Prank Liske Park Barn
2
_
Project Area(al
Coastal Wetland Area (ac)
Surface Water Area ac
28,412,881 (square feet'
3
0
4
8.38
5
Is this project High or Low Density?
Low
6
Does this project use an off -site SCM?
No
COMPLIANCE WITH 02H A003(4)
_7 _ Width of vegetated setbacks provided (feet)
8 Will the vegetated setback remain vegetated?
NUMBERANU TYPE OF SCMs:
11 ln8ltralion Stem 0
12 Bloretention 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 Stri LS-FS
0
20
Disconnected Impervious Surface (DIS)
0
21
Treatment Swale
0
22
Dry Pond
0
23
StormFiiter
0
24
Silva Cell
0
25
Ba filter
0
26
Filterra
0
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.
" CAR „
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Signature of Designer qf
:Z
Date

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
1
5
Is all/part of this project subject to previous rule
versions?
No
FORMS LOADED
AREA INFORMATION
Entire Site
LID 1
4
T e of SCM
5
Total draina a area s ft
28 412 881
28 412 881
6
Onsite draina a areas ft
28 412 881
28 412 881
7
Offsite draina a area s ft
0
0
8
Total BUA in project (sq ft
1243824 sf
1243824 sf
9permitting)
New BUA on subdivided lots (subject to
s ft
10permitting)
New BUA not on subdivided lots (subject to
s
160908 sf
160908 sf
11
10ffsite BUA (sq ft
12
Breakdown of new BUA not on subdivided lots:
Parking (sq ft
55269 sf
55269 sf
Sidewalk (sq ft
23543 sf
23543 sf
Roof (sq ft
3519 sf
3519 sf
Roadway s ft
78577 sf
78577 sf
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
15permitting)
Existing BUA that will remain (not subject to
s ft
1082916 sf
1082916 sf
16
Existing BUA that is already permitted (sq ft
17
Existing BUA that will be removed (sq ft
18
Percent BUA
4%
4%
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
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)
5
Maximum velocity in the vegetated conveyances during the 10-year storm?
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?
Yes
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:
While there are several storm pipes and area drains, these conveyances are simply to move water away trom the building an
serve as extension to the roof drains. The area these drains serve, collect rainfall from the hilled area just north of the proposed
barn. The site was designed with the intention to avoid cutting down several 24+ inch diameter old growth trees. In addition, the
previous barn structure had a similar system in place that directed the roof drain water underground (from the east side of the
barn), into a collector drain, and discharged into a small rip rap section on the west side of the barn. The area drains and pipes
in this design are intended to provide a similar drainage pattern to the one that existed previously and replace it in kind. The
discharge for these pipes is located adjacent to the building and release all stormwater onto a vegetative hill that then sheet
drains within the property. No stormwater impacts to the property are anticipated as part of this project.