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(1) Most of the room is wide open space. (5) Most of the room is filled with equipment.
(1) No visible debris and no dust on hand when slab is wiped. (3) Visible debris and dust on hand when slab is wiped. (5) Very dirty - dust blows up when floor tiles are lifted - large amount of visible debris.
(1) very clean - looks brand new. (3) visible contaminant build-up, scuff marks, etc. (5) very dirty - scuff marks, spots, dust bunnies, etc.