In addition to all of the preceding sections, commercial and industrial users shall meet all of the remaining requirements listed in the following sections as applicable to their individual operations.

1. Where installed, all grease, oil, and sand interceptors shall be maintained by the owner, at his or her expense, in keeping a continuous efficient operation at all times. The owner shall keep written records and documentation of all cleaning, repair, calibration, and maintenance required to demonstrate compliance with this section. Records shall be kept on the premises for a minimum of 3 years and made available to the administrative authority upon request.

2. Cleaning shall include scraping of walls and baffle, clearing baffle passageways between chambers. The complete removal of all contents, including floating materials, wastewater and bottom sludge and solids.

3. When necessary replace or repair baffles, inlet and outlet downturns or tees, and any other replaceable or repairable parts so that the interceptor operates as designed by the manufacturer.

4. Mixing of an interceptor is strictly prohibited.

5. Decanting, back flushing or discharging of removed wastes back into the oil and grease interceptor or oil/water separator from which the waste was removed or any other oil and grease interceptor or oil/water separator, for the purpose of reducing the volume to be hauled and disposed is prohibited.

6. Pumping frequency shall be determined by the administrative authority based on flow, volume of business, hours of operation, seasonal variations and the quantity of substances in the final compartment as required by the “25% rule” as defined in division 7. In no case shall the pumping frequency exceed 180 days unless approved by the city.

7. The “25% Rule” requires that the combined depth in the final chamber of objectionable substance (floating and settled) in an interceptor or trap shall not be equal to or greater than 25% of the total operating depth of the interceptor or trap. The operating depth of an interceptor or trap is determined by measuring the internal depth from the outlet water elevation to the bottom in the last chamber.

8. Additives placed into the oil and grease interceptor, oil/water separator or building discharge line system on a constant, regular or scheduled basis shall be reported to the administrative authority in writing at least 10 days prior to use along with the MSDS. Such additives shall include, but not be limited to, emulsifiers, enzymes, commercially available bacteria, or other additives designed to absorb, purge, consume, treat, or otherwise eliminate grease and oils. Any use of additives shall be approved by the administrative authority prior to introduction into the wastestream, interceptor, or separator. The use of additives in no way shall be considered as a substitution to the maintenance procedures required herein.

1. Where installed, all under-the-sink oil and grease traps shall be maintained by the owner, at his or her expense, in keeping a continuous efficient operation at all times. The owner shall keep written records and documentation of all cleaning, repair, calibration, and maintenance required to demonstrate compliance with this section. Records shall be kept at the facility for a minimum of 3 years and made available to the administrative authority upon request.

2. Cleaning and maintenance shall include removal of materials from the tank walls, baffles, cross pipes, inlets and outlets.

3. Mixing of an under-the-sink trap is strictly prohibited.

4. Under-the-sink oil and grease traps shall be cleaned at a minimum frequency of once a month, or more often as necessary to prevent pass through of grease and other food solids to the collection system.

5. When necessary replace or repair baffles, lid gaskets, inlet and outlet downturns, and any other replaceable or repairable parts so that the trap operates as designed by the manufacturer.

6. Additives placed into the trap on a constant, regular or scheduled basis shall be reported to the administrative authority in writing at least 10 days prior to use along with the MSDS. Such additives shall include, but not be limited to, emulsifiers, enzymes, commercially available bacteria, or other additives designed to absorb, purge, consume, treat, or otherwise eliminate grease and oils. Any use of additives shall be approved by the administrative authority prior to introduction into the wastestream, interceptor, or separator. The use of additives in no way shall be considered as a substitution to the maintenance procedures required herein.

1. All businesses dealing in food preparation of any kind, such as, but not limited to, restaurants, commissaries, kitchens, and caterers shall install a minimum 800-gallon approved oil and grease interceptor in accordance with the International Plumbing Code or Uniform Plumbing Code which ever is more restrictive.

2. If multifamily dwellings, such as townhouses, condominiums, apartment buildings, apartment complexes or areas of intensified dwelling, are found by the administrative authority to be contributing oil and grease in quantities sufficient to cause main line stoppages, lift station malfunctions, or necessitate increased maintenance on the collection system, said user(s) shall be directed to cease discharging oil and grease to the wastewater system and/or shall be required to install a grease and oil interceptor. A control manhole or inspection box for monitoring purposes shall be required and installed at the owner/operator's sole expense, in accordance with the International Plumbing Code or Uniform Plumbing Code which ever is more restrictive, and 800 gallons is the absolute minimum size.

3. Under-the-sink oil and grease traps are prohibited on new construction unless approved by the administrative authority.

1. Automotive related enterprises, commercial laundries and laundromats, and other users, which contribute wastes containing petroleum (hydrocarbon), based oils, greases, sand, sludge, lint and other materials shall install an approved oil/water separator, lint removal system or both in accordance with the International Plumbing Code.

2. The minimum interceptor size for car washes shall be 1,500 gallons. An approved control manhole or inspection box for monitoring purposes shall be required and installed at the owner/operator's sole expense.

1. Existing food service or automotive related facilities that discharge into the city sewer system, shall be required to install an approved, properly operated and maintained oil and grease interceptor, grease trap or oil/water separator approved by the administrative authority when the following exist:

a. If there is no interceptor or trap at this facility which operates as, or has discharges of liquids or wastes typical of, the facilities identified in this code for interceptor installation.

b. Remodeling of a structure that will be discharging certain liquids or wastes to the POTW may be prohibited or limited by the provisions of this chapter.

c. The existing pretreatment device is in a state of disrepair such that it cannot be repaired to achieve continuously efficient operation.

d. The existing pretreatment devise is hydraulically undersized to receive discharges from the fixtures or equipment requiring pretreatment.

e. The City Council shall, from time to time, by resolution, establish the maximum quantities of certain substances, which may be discharged into the sewer system or treatment works operated by the city. Discharge into the sewer system or treatment works of any such substance in a quantity or concentration in excess of that set forth in such resolution shall constitute a violation of this section.

2. Every building must be separately connected with a public sewer, however, 1 or more buildings located on lots or parcels of land belonging to the same owner may be served with the same building sewer during the period of said ownership. If the property is subdivided and different ownerships are created, sewer service can be provided by separate connection of each building to the public sewer, or by an onsite collection system, which collects sewerage from 2 or more buildings and conveys it to the public sewer.

a. Ownership and maintenance of the onsite collection system shall remain with the property owner(s), under the authority of a duly created property owners association, unless prior to approval/construction of the onsite collection system, formal written request is made to the City Council to accept the system for ownership and maintenance, the onsite collection system is designed and constructed in accordance with these documents and all State and Federal regulations, and the City Council accepts the system for ownership and maintenance.

b. The property owner shall also grant perpetual unencumbered access to all facilities located on said property through the granting of perpetual easements and/or rights of way of sufficient width, as determined by the city, to allow full operation, maintenance and repair of said facilities in the future. All such easements and/or rights of way shall be recorded with the county before being considered valid.

c. Ownership and maintenance of the onsite collection system by the city will not become effective until all construction has been completed, the property owner's professional engineer has submitted all required drawings, electronic files, test results, certification of completion and other documents determined by the Department, the property owner has submitted adequate proof of the required access easements and/or rights of way necessary for perpetual access to the facilities and the city has issued a letter indicating that the work has been done in accordance with these regulations.

(Ord. 13-1090, § 8, passed 3-12-2013; Ord. 932, passed 8-26-2008)