In addition to categorical pretreatment standards, no significant industrial user (SIU) shall discharge wastewater containing pollutants into the system in excess of limitations specified in its wastewater discharge permit or any other limits established by the City. The City may establish and revise from time to time standards for specific restricted substances. These standards shall be developed in accordance with 40 CFR 403.5 and shall implement the objectives of this title. These standards, including best management practices (BMPs), are only applicable to significant industrial users. Standards established in accordance with this title will be deemed pretreatment standards for the purposes of Section 307(d) of the Clean Water Act. Wherever a discharger is subject to both categorical pretreatment standards and a local limit for a given pollutant, the more stringent limit or applicable pretreatment standard shall apply. The City may also develop best management practices (BMPs) to implement permit specific and local limits for industrial users. BMPs shall be considered local limits and pretreatment standards. The City may impose mass limitations in addition to (or in place of) concentration-based limitations. [Ord. NS-2182, 2012]