Grease, oil, and sand interceptors shall be provided, operated, and maintained when the WRD Manager determines they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand, or other harmful substances; except that such interceptors shall not be required for residential users. All interceptors shall be located as to be readily accessible for cleaning and inspection.

All interceptors associated with such facilities shall be inspected, cleaned, repaired and maintained regularly, at the user’s expense, to ensure efficient and proper operation at all times. The WRD Manager has the authority to establish interceptor cleaning frequencies; compliance with such established cleaning frequencies does not relieve user of its obligation to comply with any or all other applicable regulations, standards, or requirements.

Cleaning the interceptor shall include removal of all contents, including floating materials, wastewater, bottom sludge and solids, and pressure washing or scraping of all accumulated grease from walls and baffles. All cleaning residues shall be satisfactorily disposed of in an approved environmentally acceptable manner. FOG removed from interceptors shall not be disposed of in the sanitary or storm sewer. Decanting or discharging of removed waste back into the interceptor from which it was removed for the purpose of reducing the volume to be disposed is prohibited. The use of hot water, enzymes, bacteria, chemicals or other agents or devices for the purpose of causing the contents of an interceptor to be discharged into the sanitary sewer system or to avoid the installation of an interceptor is prohibited.

All grease, oil, and sand interceptors shall be installed in conformance with the most recent revision of the Oregon Plumbing Specialty Code, the rules adopted thereunder, and any statute or rule of general applicability administered by the State of Oregon Building Codes Division.