Matter from domestic, commercial, or industrial garbage grinders shall not be discharged into the wastewater system or facilities. However, matter generated by garbage grinders in the preparation of food normally consumed on the premises is excepted from this prohibition. Additionally, if the permittee has obtained a permit for that specific use from the Director and agrees to undertake whatever self-monitoring is required to enable the Director to equitably determine the sewer service charges based on the waste constituents and characteristics, such matter is also excepted. Such grinders must shred the waste to a degree that all particles will be carried freely under the flow condition normally prevailing in the public sewer. It is unlawful to use a garbage grinder for grinding plastic, paper products, inert materials or garden refuse. (Ord. 2466 § 7, 1991).