All users shall promptly notify the City in advance of any substantial change in the volume or any change in character of pollutants in their discharge, including significant manufacturing process changes, pretreatment modifications, and the listed or characteristic hazardous wastes for which the user has submitted initial notification under 40 CFR 403.12(p). Substantial change is defined to mean a change of 10 percent or more in discharge volume. [Ord. NS-2182, 2012]