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Fat, grease, grit, oil, lint, and sand removal devices (interceptors and grease traps) shall be installed by the user when it is determined by the city that such device is necessary for the proper handling of liquid wastes containing grease, fat, grit, oil, lint, sand or other harmful ingredients which accumulate and cause or threaten to cause stoppage or impair the efficiency of the sewers, wastewater plant or the safety of the city employees, except that such removal devices shall not be required for residential units. Grease removal devices are required at all food service establishments. A food service establishment is any commercial facility discharging kitchen or food preparation wastewater including, but not limited to, restaurants, fast food establishments, delicatessens, caterers, bakeries, donut shops, halls and auditoriums with kitchens, and any other businesses that perform on-site cooking or food preparation.

All removal devices shall be of a type and capacity approved by the division of water resources and conservation and compliant with Uniform Plumbing Code. The user shall pay the applicable charges and fees and meet such other conditions as required by the POTW prior to installation. The removal device shall be installed in conformity with approved plans and in accordance with all applicable codes and regulations. The removal device shall be located so as to be readily and easily accessible for cleaning and inspection. No device shall be installed in a food preparation area.

Minimum grease removal device sizing criteria for new and modified kitchens:

A. Exterior in-ground grease interceptors are required for any food establishment with greater than nine drainage fixture units within the kitchen. The grease interceptor shall be a two-stage grease interceptor with a minimum capacity of one thousand gallons. A larger grease interceptor(s) may be required based on the total amount of drainage fixture units as per the most current Uniform Plumbing Code.

B. Hydro-mechanical grease interceptors or grease traps are required for any food establishment with less than nine drainage fixture units within the kitchen. A minimum grease trap size of fifty/one hundred equipped with a flow control valve is required or an equivalent grease removal device that is approved by the Plumbing and Drainage Institute (PDI) may be considered. If two or more significant drainage fixtures cannot be plumbed into one grease trap, then each separate fixture will be plumbed to a separate grease trap. A larger grease trap(s) may be required based on total amount of drainage fixture units as per the most current Uniform Plumbing Code.

A vent is required to be installed downstream of any interior grease trap in accordance with the Uniform Plumbing Code.

C. The following connections are restricted and/or prohibited:

1. Garbage grinders (disposals), except in the case where a one-thousand-gallon grease interceptor (or larger) is in use.

2. Dishwashers, except in the case where a one-thousand-gallon grease interceptor (or larger) is in use.

3. Toilets, urinals, wash basins or any fixtures receiving fecal material shall not flow through the grease removal device.

TABLE A

DRAINAGE FIXTURE UNIT VALUES 

Type of Kitchen Fixture

Trap and Trap Arm Size

Fixture Units

Hand sink

NA

0

Prep 1-compartment sink

1-1/2-inch

3

2-compartment sink

1-1/2-inch

3

3-compartment sink

1-1/2-inch

3

3-compartment sink

2-inch

4

3-compartment sink

3-inch

6

Mop sink

2- or 3-inch

3

Wok stove drain

2-inch

4

Dishwasher

2-inch

4

Floor drains

2-, 3- or 4-inch

2, 3 or 4

Floor sinks

3- or 4-inch

3 or 4

Notes:

1. Hand sinks are not required to be plumbed to any grease removal device.

2. Prep sinks, mop sinks and floor drains may be required to be connected to a grease removal device at the discretion of the city.

3. "Trap arm" is the portion of the fixture drain between a trap and the vent.

4. Any dishwasher connection to a grease removal device will require a minimum one-thousand-gallon gravity or exterior interceptor.

5. For any indirect waste systems where hub drains and floor sinks are used as a receptor for dishwashers, two- and three-compartment sinks, or other similar fixtures, the drainage fixture unit count shall be twice the floor sink or hub drain fixture unit count and the drainage fixture unit count for the indirect waste source is not counted.

The removal device shall be maintained in efficient operating condition by periodic removal of accumulated grease, fat, grit, oil, lint, sand or other material. Failure to clean or maintain the removal device shall be a violation and subject to an enforcement action as stated in city codes and regulations. Wastewater having excessive temperatures (from dishwashers for example) causing the pass through of grease, shall not be discharged to the removal device. No emulsifiers, enzymes, solvents or any other substances which cause the pass through of grease shall be used in the removal device. Removal devices shall be located upstream of any dishwashers or discharges exceeding one hundred ten degrees Fahrenheit. Users requiring removal devices shall maintain records of maintenance and cleaning of removal devices for three years. These records shall be made available to the city for inspection and copying upon request.

Abandoned grease, fat, grit, oil, lint or sand removal devices shall be removed as required for abandoned septic tanks (Uniform Plumbing Code) within thirty calendar days of cessation of business. All costs related to the installation or removal of the devices shall be the responsibility of the user or property owner. (Ord. 2402 NCS §2 (part), 2011; Ord. 2282 NCS §3 (part), 2007.)