Work of more than
one category shall be part of a single work project. Related
work permitted within a 12-month period shall be considered
to be a single work project. Where a project includes one category
of work in one building area and another category of
work in a separate and unrelated area of the building, each
project area shall comply with the requirements of the respective
category of work. Where a project with more than one
category of work is performed in the same area or in related
areas of the building, the project shall comply with the
requirements of the more stringent category of work.