Solid or viscous substances in quantities or of such size capable
of causing obstruction to the flow in sewers or other interference
with the proper operation of the POTW, including 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 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, plastics, rubber,
tar, asphalt residues, residues from refining or processing of fuel
or lubricating oil, mud or glass grinding or polishing wastes.