Businesses that operate automobile and truck repair facilities, steam cleaning facilities for motorized equipment, car sales lots, filling stations or any other establishment where petroleum-based grease and oil may be introduced to the sewer system shall have pretreatment facilities to prevent the discharge of oil and grease. These pretreatment facilities must be oil/water separators or interceptors located to collect such mixtures of grease, oil and water. Pretreatment facilities shall be in accordance with city and Washington State Department of Ecology standards. Businesses shall maintain, inspect and clean oil/water separators on a schedule that provides for effective operation.

Oil/water separators shall be inspected monthly or more frequently, as needed, by the owner. API oil/water separators shall be cleaned before the oil layer reaches three inches in depth. Coalescing plate separators shall be cleaned before the plates are coated with silt and/or solids. Cleaning shall include removal of all oil, water, and sediment, and refilling the separator with clean water. Cleaning shall be performed by a qualified service contractor. All material removed shall be disposed of in accordance with all federal, state, and/or local laws. (Ord. 6152 § 5, 2008.)