Solid or viscous substances which may cause obstruction to the flow
in the sewer system or interfere with the operation of the POTW treatment
plant, 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,
waste paper, wood, plastics, gas, tar, asphalt residues, residues
from refining or processing of fuel or lubricating oil, mud, glass
grinding or polishing wastes.