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A. The grease trap or grease interceptor shall be kept in continuous operation at all times and shall be maintained to provide efficient operation. Businesses shall not allow the addition of emulsifying agents for the purposes of emulsifying polar or nonsolid FOG. Interceptor cleaning shall be done only by a service contractor qualified to perform such cleaning. All material removed shall be disposed of in accordance with all city, county, state, and federal regulations.

B. Grease Interceptor Cleaning.

1. Grease interceptor maintenance shall include quarterly (four times annually) pumping and cleaning of the interceptor, which shall be set forth in the FOG plan. The business may request to modify the quarterly cleaning frequency, by demonstrating that all solids and grease layers reported over the previous 12 months were less than 15 percent of the interceptor’s capacity. The city reserves the right at any time to modify the FOG plan to increase the cleaning frequency, if the grease interceptor’s solids and grease layer exceed 25 percent of its capacity at any time in the previous 12 months.

2. Grease interceptor maintenance shall include removal of all FOG, solids and water from the grease interceptor. Skimming the surface layer of waste material, partial cleaning of the interceptor or use of any method that does not remove entire contents of the collection device does not constitute maintenance under this chapter. After a complete evacuation, the walls, top and bottom of the interceptor shall then be thoroughly scraped and the residue removed. The grease interceptor shall be filled with clean water before returning to service.

C. Grease Trap Cleaning.

1. Grease trap maintenance shall occur at the intervals set forth in the FOG plan, which shall not exceed 90 days. Grease trap maintenance shall include removal of the grease layer, scraping of baffles and removal of the sediment layer. The grease trap shall be filled with clean water before returning to service. A cleaning company, licensed to do business in the city of Auburn, may be employed to pump out the trap.

2. Self-Cleaning. A business may be allowed under its FOG plan to self-clear its grease trap(s) located inside a building provided:

a. The grease trap is no more than 55 gallons in liquid/operating capacity.

b. Whenever the grease trap is inspected or cleaned, seams and pipes are checked for leaks, and the baffles and flow-regulating devices checked for effective operation.

c. All FOG and food waste (including caked-on FOG and waste) is removed from the grease trap and its baffles.

d. Oil and grease are skimmed from the surface of the water and placed in a watertight container.

e. Solids are removed from the bottom of the grease trap and placed in a watertight container.

f. The grease trap is filled with clean water before returning to service.

g. The business records the date of cleaning and the amount of material removed from the grease trap in a maintenance log, and reports the information to the city under the terms of the FOG plan.

h. All grease trap waste is placed in a leak-proof, sealable container(s) located on the premises, and shall be disposed of by either:

i. Contracting with a licensed cleaning company to pick up the collected waste; or

ii. Absorbing all free liquid with a dry absorbent and dispose as solid waste in a watertight container.

D. It is a violation of this chapter to discharge any waste, including FOG and solid material, removed from the grease trap to any drainage piping connected to the sanitary sewer or the storm drainage system. (Ord. 6152 § 5, 2008.)