Phosphorus and nitrogen, which may cause growth of
troublesome plants in water courses.
· Oils and greases, which include dangerous substances such as
benzene, lead, zinc, chromium, arsenic, cadmium, nitrate and
other metals such as copper resulting from auto brake.
· Chemicals and oils used for maintenance of cleaning machines.
· Chemicals, such as hydrofluoric acid and ammonium bifluoride
products and solvent-base solvents, which are considered
harmful to living organisms.
· Surface active substances contained by detergents which are
regarded toxic substances that reduce water surface tension
allowing washing of dirt or grease from vehicles.
· Dirt suspended in water inlets and bar screens which could
prevent discharge of water into sewers.