Amazing how quickly site work can progress in two short days...compare today's photos to those from Tuesday. The foundation "pit" is now being filled with rock to compress the moisture out of the soil below. When the "pit" is filled to roughly the finished grade level, an amount of surplus equal in weight to the building itself will be placed on top to speed compaction, which will be measured by pressure plates buried at the base of the pit. Some have asked if the building will have a basement due to the excavation below grade; while the building will be on a slab rather than a basement foundation, the soil conditions necessitated compaction.
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