2008-0017 GT Worksheet.pdf• A Grease Trap plumbing permit is required ($165.00 fee). Contact the Pretreatment
Technician (425-672-5755) if you have any questions and also to get signature approval on
this form.
• Dishwashers are not allowed to be connected to a Grease Trap.
• Food disposers are not allowed in a facility served by a Grease Trap and must be disabled or
removed. Solids must be screened out and placed in the solid waste container.
Number of Fixtures Connected to a Grease Trap
Fixture Capacity in Cubic
Inches
x W x D x no. of sinks
Fixture Capacity
in Gallons
Cu. In. - 231
Drainage Load
(75% of Total
Ca aci
Flow Rate for
a 2 -Minute
Drain Period
#1
231 = al.
x .75 w al.
- 2 2m
92
x x x = c.i.
- 231 = al.
x.75 = al.
_ 2 = m
93
x x x = c.i.
- 231 = gal.
x .75 = al.
- 2 = m
94
x x x = c.i.
- 231 = al.
x .75 = gal.
-2= m
Grease Trap #1-- Total drainage flows from maximum of 4 fixtures
gpm
#1
x x x = c.i.
_ 231 = al.
x.75 = gal.
- 2 = 2m
#2
x x x — c.i.
- 231 = al.
x.75 = gal.
- 2= gpm
43
x x x = c.i.
231 = a1.
x.75 = gal.
- 2 — m
#4
x x x = c.i.
- 231 = gal.
x.75 = gal.
- 2= 9pm
Grease Trap #2 — Total drainage flows from maximum of 4 fixtures
gpm
MINIMUM SIZE OF GREASE TRAP(S) REQUIRED
gpm
Number of Fixtures Connected to a Grease Trap
1
3
4
Grease Trap Size in m
20
35
50
Upsize for factors such as high volume dishwashing, high oil/grease content on menu, etc.
---------------------------------------- (For City use only below this line)
Remarks: dos Q vu`C' �`tsrl� ►� ���
Size Approved: _ gpm Approved by: Date: (t4f%o
treatment Technician