Solids or viscous substances which may cause obstruction
to the flow in a sewer or other interference with the operation of
the wastewater treatment facilities such as, but not limited to, garbage
with particles greater than 1/2 inch in any dimension, animal guts
or tissues, paunch manure, bones, hair, hides or fleshings, entrails,
whole blood, feathers, ashes, cinders, sand, spent lime, stone or
marble dust, metal, glass, straw, shavings, grass clippings, rags,
spent grains, spent hops, wastepaper, wood, plastic, gas, tar, asphalt
residues, mud, or glass grinding or polishing wastes.