If, after analysis by the director of the wastewater to be discharged by a commercial or industrial entity where pretreatment to the degree required is not provided by the user, the director determines that the city can treat the excessive strength of the wastewater only by special construction, operation or maintenance of the city wastewater system, then a surcharge shall be imposed upon any such user of the system. [Code 2006 § 13-7-5. Ord. 2009-04, 4-14-2009; Ord. 2014-06 § 1, 5-27-2014; Res. 2014-10 Exh. A, 5-27-2014].