Solid 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 grease,
garbage with particles greater than 1/2 inch in any dimension, animal
guts or tissues, paunch manure, bones, hair, hides or fleshing, entrails,
whole blood, feathers, ashes, cinders, sand, spent lime, stone or
marble dust, metal, glass, straw, shavings, grass clippings, rags,
spent grain, spent hops, wastepaper, wood, plastics, gas, tar, asphalt
residues, residues from refining, or processing of fuel or lubricating
oil, mud, or glass grinding or polishing wastes.