The admission into the public sewers of any waters or wastes having (a) a five-day biochemical oxygen demand greater than three hundred fifty (350) milligrams per liter; (b) containing more than three hundred fifty (350) milligrams per liter of suspended solids; (c) having the characteristics described in Section 13.08.550 (C) or constituent levels in excess of those enumerated in Section 13.08.550 (A); or (d) having an average daily flow greater than .05 MGD, or one percent of the average daily sewage flow of the city, shall be subject to the review and approval of the city. When necessary in the opinion of the city the discharger shall provide, at his/her expense, such pretreatment as may be necessary to: (a) reduce the BOD discharge to three hundred fifty (350) mg/l and suspended solids to three hundred fifty (350) mg/l; (b) reduce objectionable characteristics or constituents to within the maximum limits provided in Section 13.08.550; or (c) control the quantities and rates of discharge of such water or wastes. Plans, specifications, and any other pertinent information relating to proposed pretreatment facilities shall be submitted for the approval of the city and no construction of such facilities shall be commenced until said approval is obtained in writing. Material which shall readily settle, such as sand, glass, metal filings and diatamaceous earth, for example, or floatable material which is readily removable shall be removed from wastewater prior to discharge to the public sanitary sewer system. The review and approval of such plans and/or proposed operation procedures shall in no way relieve the discharger from the responsibility of modifying the facility as necessary to produce an effluent acceptable to the city and in accordance with federal and state standards, under the provisions of this chapter. Any subsequent changes in the pretreatment facilities or method of operation shall be reported in writing to and be approved by the city. (Ord. 2006-02 (part), 2006: Prior code § 4257)