"during excavation" is correct and usable in written English.
Example Sentence: Archaeologists uncovered priceless artifacts during excavation of the ancient ruin.
Stones collected during excavation are used as retaining walls.
The wall deflections were carefully observed during excavation.
The bones had been found during excavation for a $109 million courthouse complex.
Inner channels are rarely seen except when exposed during excavation associated with dam construction.
If rock is encountered during excavation it must be removed by hand.
Display windows contain bits of pottery and glass that were found during excavation work.
Linda Sohus was never found, but John Sohus's bones were unearthed during excavation of a swimming pool.
Back analysis was performed on the monitored site data obtained during excavation and construction.
Spatial configuration of discontinuities often defines how rock masses behave during excavation.
The retaining walls used during excavation dewatering cause hydraulic head drawdown inside the pit much faster than outside the pit.
G 2388 was assigned during excavation to the chapel area N of G 2387 and E of G 2379.
