• Any type of business where oil and grease may be discharged into a public sewer shall have an interceptor/trap. The interceptor or trap shall be of a type and capacity approved by the Director.
• Each interceptor/trap shall be so installed and connected that it shall be at all times easily accessible for inspection, cleaning and removal of grease and other material. Interceptors/traps installed outside of the building shall be constructed in such a manner so as to exclude the entrance of surface water and storm water.
• The interceptor or trap shall be situated on the User's premises.
• Buildings remodeled for use requiring interceptors/traps shall be subject to these regulations.
• Waste discharges from fixtures, including but not limited to, scullery sinks, pot and pan sinks, mop sinks, soup kettles and floor drains, shall be drained into the sanitary sewer through an interceptor/trap. Toilets, urinals, and other similar fixtures shall not drain through the interceptor/trap
• Interceptors and traps shall be maintained in efficient operating condition. At minimum, grease traps must be cleaned monthly or as deemed necessary by the Environmental Compliance Inspector. The use of chemicals, bacteria or other agents to dissolve grease or otherwise clean grease interceptors/traps is specifically prohibited. No such grease shall be introduced into any drainage piping or public or private sewer.
• Large capacity concrete type interceptors shall have a suitable sample box to provide access for collection of wastewater samples as required by the Director. Large interceptors must be serviced every three-months or as deemed necessary by the Environmental Compliance Inspector.
• Each appliance connected to a pre-cast under sink type grease trap shall have a flow device installed. No dishwasher may be connected to these types of grease traps.
• A record of grease trap cleaning or copies of grease interceptor servicing must be maintained for a twelve-month period and made available for inspection by the city's representative.

There are two basic types of grease interceptors:

1) CAST IRON/FIBERGLASS GREASE TRAPS: These are commonly referred to as traps and typically are under sink units that should only be used where oil and grease waste are minimal. These units are rated in pounds of grease capacity. (e.g. 100-pound unit).

• Dishwasher Connection Prohibited: Automatic dishwashers must not be connected to grease traps. The City recommends that dishes receive a pre-rinse in a prep-sink connected to the interceptor, before being loaded into the dishwasher for final cleaning.
• Installation: Each trap shall be so installed and connected that it shall be at all times easily accessible for inspection, cleaning and removal of intercepted grease and other material.
• Maintenance: The trap shall be maintained by the owner, at his/her expense, in an efficient operating condition at all times, with a minimum monthly removal of the accumulated grease and other material. Accumulated grease shall be either placed into an establishment's tallow drums or deposited in a plastic garbage bag, tied shut, and then placed in a plastic bucket with a tight sealing lid for disposal into the garbage dumpster. A log of grease trap cleaning must be maintained and made available for inspection. If a trap cleaning service is used, dated receipts must be available for inspection.

 2) POURED-IN PLACE/PRECAST CONCRETE TYPE: These types of tanks are commonly referred to as interceptors and are usually installed belowground. Capacity of an interceptor is rated in gallons of liquid (i.e. 1,500 gallons).

• Dishwasher Connection Prohibited: Automatic dishwashers must not be connected through interceptors. The City recommends that dishes receive a pre-rinse in a prep-sink connected to the interceptor, before being loaded into the dishwasher for final cleaning.
• Installation: Each interceptor shall be so installed and connected that it shall be easily accessible for inspection, cleaning and removal of intercepted grease and other material. Installations of large tanks require experienced licensed contractors to perform excavation work and placement of the tank.
• Maintenance: These types of interceptors require maintenance that can only be provided by an interceptor tank pumping service. When emptied, the units should be thoroughly washed and all interior plumbing com1ections inspected for completeness and integrity. Dated receipts of interceptor pumping must be maintained for a twelve-month period and be available for inspection.

The following criteria are used to determine the size of a trap/interceptor:

1. Uniform Plumbing Code
2. Number of meals being served.
3. Seating Capacity
4. Volume of wastewater being discharged.
5. Retention time and storage factor ratings
6. Type of foods being prepared (cooked versus uncooked)
7. Disposable or washable dishware
8. Type of food service facility (fast-food, sit-down restaurant, cafeteria)
9. Frequency of maintenance or lack thereof
10. Accessibility of installation

(This portion is of particular interest to food service facilities. The complete ordinance may be found online.)

16.08.140 INTERCEPTORS.

1. The director may require a discharger of industrial wastewater to install an interceptor. Required interceptors shall be of a type and capacity approved by the director.
   1. Installation. The interceptor shall be installed as required by the Uniform Plumbing Code and by the city. The interceptor shall be installed so that it is at all times easily accessible for inspection, sampling, cleaning, and removal of intercepted wastes. The director may require that interceptors have a sampling box installed. The sampling box shall be located so that it is at all times easily accessible for inspection and sampling. The interceptor and sample box shall be constructed in such a manner as to exclude the entrance of surface water and storm water. The interceptor shall be situated on the user's premises unless the director approves installation in the public street or sidewalk area.
   2. Cleaning and Repairs.
      1. The interceptor shall be cleaned, maintained, and repaired by the owner or operator at his/her own expense. Cleaning shall require that the entire contents of an interceptor be pumped out and disposed of at a facility designed to handle such waste. Pumped interceptor contents shall never be discharged into any drainage piping, public or private sewer. A record of interceptor cleaning and maintenance or copies of interceptor pumping receipts must be maintained onsite for a twelve-month period and made available for inspection upon request by the city's representative.
      2. Prior written approval from the director must be obtained prior to the use of chemicals, bacteria or other agents to dissolve grease or otherwise clean or treat grease interceptors.
      3. When it is determined that repairs to either the interceptor itself or to the external plumbing are necessary, such repairs shall be completed within thirty days of notification or sooner if the director determines that delay may result in interference with the POTW.
2. Building Remodels. Buildings remodeled for uses requiring interceptors shall be subject to the aforementioned regulations. Abandoned interceptors shall be emptied and filled as required for abandoned septic tanks, according to the Uniform Plumbing Code and the city.

(Ord. 2002-24 § 2 (part), 2002).

16.08.180 BEST MANAGEMENT PRACTICES FOR BUSINESSES.

All business activities shall implement mandatory best management practices (BMPs) as detailed in the latest BMP Manual published by the city's public works department. New employees shall be trained in best management practices before beginning work and annually thereafter.

(Ord. 2002-24 § 2 (part), 2002).

16.08.190 FOOD SERVICE FACILITIES.

1. Grease Interceptors.
   1. Food service facilities meeting the requirements of this subsection (a) shall be exempt from the animal and vegetable oil and grease limit of Section 16.08.110.
   2. Food service facilities shall have an interceptor if oil or grease may, in the opinion of the director, be discharged to the sanitary sewer. The interceptor type and capacity shall be approved by the director.
   3. Interceptors shall be installed, cleaned, maintained, and repaired in accordance with this chapter and as required by the director.
   4. A dishwasher shall not be connected to an interceptor unless approved by the director.
   5. New and existing businesses or facilities and building remodels shall comply with this chapter. A completed grease trap/interceptor questionnaire form must be submitted to the director prior to commencing construction of new facilities or remodeling.
2. Garbage grinders shall not be connected to the sanitary sewer.
3. New and remodeled food service facilities, that use or will use kitchen floor mats, shall provide an enclosed area for washing mats. Such an enclosure shall drain to the sanitary sewer. The enclosure shall have drain screens to retain particles larger than one-half inch, which shall not be discharged to the sanitary sewer. The enclosure shall be constructed so that storm water may not flow into the area and that wastewater may not flow out. The director may require such enclosures to be connected to an interceptor.

(Ord. 2002-24 § 2 (part), 2002).