(1) Grease, oil, sand, heavy metals, or such other needed interceptors shall be provided when, in the opinion of the public works director, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable waste containing grease in excessive amounts, or any flammable wastes, sand, or other harmful ingredients. Such interceptors shall be of a type and capacity approved by the public works director and shall be located as to be readily and easily accessible for cleaning and inspections.

(2) All substance interceptors and grease traps shall be properly installed, maintained and operated by the user at the user’s expense. The pretreatment facilities shall be kept in continuous operation at all times, and shall be maintained to provide efficient operation.

(3) Cleaning must be performed by a service contractor qualified to perform such cleaning, or in a manner approved by the city. All material removed shall be disposed of in accordance with all state and federal regulations. All waste removed from such facilities shall not be disposed of in the sanitary or storm sewer. Furthermore, the use of hot water, enzymes, bacteria, chemicals or other agents or devices that cause the contents of a pretreatment device to be discharged into the sanitary sewer system is prohibited.

(4) Records of maintenance shall be made readily available on site to the city for review and inspection, and must be maintained for a minimum of five years. All maintenance records shall be submitted on a routine basis for businesses whose operations are known to generate high levels of harmful ingredients or who have failed in the past to properly maintain their pretreatment facilities and fail to produce a discharge quality in compliance with the city’s requirements.

(5) Screens approved by the city engineer shall be installed, operated and maintained by and at each and every industrial plant connected to the sanitary sewage system, to screen any coarse solids from the industrial waste before it is discharged to the industrial sewer. (Ord. 1405 § 1 (Exh. 1), 2015).