Question

what does \double dumping\ mean?
placing two lifts without compaction
compacting a single load two times
placing a layer of rock over a layer of soil
compacting a layer of rock over a layer of soil

Explanation:

Double - dumping refers to the act of compacting a single load two times. This term is often used in construction or material - handling contexts where proper compaction is important for stability and efficiency.

Answer:

Compacting a single load two times