Proposed course, mean 'suggested way'.
manual excavation
Excavation to correct unsuitable sub-grades and embankment foundations and disposal of the excavated material. This defines the quantity of soil to be removed (organic, muck) and replaced.
The suffix of "excavation" is "-tion".
The abbreviation for "excavation" is "excav."
Bill
archaeology
Excavation is a noun and so doesn't have a past tense.The past tense of excavate is excavated.
It isn't. Unless you mean: "when is it a waste of money?", because then the answer is: "when the excavators come up empty".
The answer depends on where in the world the excavation is to take place.
There are three main types of excavation: topsoil excavation, rock excavation, and muck excavation. Topsoil excavation involves removing the top layer of soil; rock excavation involves breaking and removing solid rock; and muck excavation involves digging soft, wet, and unstable soil.
Yes, words ending in "ion" are almost always nouns. The noun excavation is a singular, common noun, a word for the act of excavating or the site of excavation, a thing.