Solid or viscous wastes: solids or viscous wastes
which will or may cause obstruction to the flow in a sewer or otherwise
interfere with the proper operation of the treatment works. Prohibited
materials include, but are not limited to, uncomminuted garbage, animal
guts or tissues, diseased human organs or tissue fluids, 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 grains, spent hops, wastepaper,
wood, plastic, tar, asphalt residues, residues from refining or processing
of fuel or lubricating oil and similar substances. (Other materials
may be specified at the discretion of the Director).