All private residential storm drainage inlets, under-drains and gutters shall be inspected annually and cleaned prior to the beginning of the rainy season if there is evidence of one or more of the following conditions:
(1) The sediment/debris storage volume is 25 percent or more full;
(2) There is evidence of illegal discharge;
(3) Accumulated sediment or debris impairs the hydraulic function of the facility. Private streets shall also be swept and maintained as needed to prevent sediment, gardening waste, trash, litter and other contaminants from entering the City's storm drainage system.