Inspections such as checking the slump of concrete, the 7, 14, 28 day strength of concrete, or checking the compaction of fill placed back into a ditch, testing the bearing capacity of undercut prior to pouring the bottom slab of a building or pressure testing pipes are all conducted when? Inspections such as checking the slump of concrete, the 7, 14, 28 day strength of concrete, or checking the compaction of fill placed back into a ditch, testing the bearing capacity of undercut prior to pouring the bottom slab of a building or pressure testing pipes are all conducted when? Operations