In that case, plan on waiting seven days before placing the full depth of backfill .
This preliminary surcharge is equivalent to an average of 8.0 m (an increase of 2.0 m over the design stage) of backfill east of the quay wall.
The crusher broke the concrete into pieces of a size that could be put back into the ground as backfill for the new construction.
It also implies, but does not explicitly require, important installation details, such as complete backfilling of the trench and thorough compaction of backfill .
That's enough to locate buried foundations, pipes, and cables and determine the thickness and location of backfill .
They reopened the mine, hoping to find fluorite that had been left behind - either in place or as backfill by previous lead-mining operations.
It also requires adequate, trash-free backfill and sufficient soil moisture for compaction, as well as site conditions enabling a trencher to maneuver.
you'll need to backfill with excavated material
One approach is to place loose backfill under structurally supported slabs.
Before that, fluorite encountered in mining was considered waste and used as backfill or dumped.