All grease interceptors shall be of a type and capacity approved by the pretreatment coordinator and shall be so located to be easily accessible for cleaning and inspection. The size, type and location of each grease interceptor shall be approved by the pretreatment coordinator before installation. The pretreatment coordinator is authorized to make determinations of grease interceptor adequacy and need, based upon a review of relevant information regarding grease interceptor performance, maintenance, and facility site and building plan review and to require repairs to, and modification or replacement of such interceptors.
1. The minimum approved grease interceptor size is 500 gallons, working capacity. The size of the interceptor shall be determined using the following flow based criteria:
Fixture Type # of Fixtures Flow (GPM) Total Flow (GPM)
Kitchen Area Sinks:
Single Compartment ____________ x 20 = _________________
Double Compartment ____________ x 25 = _________________
Triple Compartment _____________ x 30 = _________________
Mop/Clean-up __________________ x 20 = _________________
Dishwashers:
up to 30 gallon capacity __________ x 15 = _________________
30 to 50 gallon capacity ___________ x 25 = _________________
50 to 100 gallon capacity __________ x 40 = _________________
Grand Total Flow = _________________
Detention Time Factor (x10) = _________________
Required Grease Interceptor Capacity = _________ gallons
Kitchen Area Sinks:
Single Compartment ____________ x 20 = _________________
Double Compartment ____________ x 25 = _________________
Triple Compartment _____________ x 30 = _________________
Mop/Clean-up __________________ x 20 = _________________
Dishwashers:
up to 30 gallon capacity __________ x 15 = _________________
30 to 50 gallon capacity ___________ x 25 = _________________
50 to 100 gallon capacity __________ x 40 = _________________
Grand Total Flow = _________________
Detention Time Factor (x10) = _________________
Required Grease Interceptor Capacity = _________ gallons
2. FSEs that propose the use of alternate sizing techniques and/or procedures that result in specifications that differ from requirements calculated under subsection 1, must submit formulas and other basis to support the proposed grease interceptor size/installation signed by a professional mechanical engineer registered in the state of Iowa.