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Foundation compaction
Auer's right but I'd like to add you should talk to a local building department official and a civil engineer or archiitect familar with your situation/conditions.
Generally speaking, you need to use a compactor to compact in what are called lifts---usually 3-4" thick layers of fill. BUT it depends on what type of fill you are using, moisture content, etc., etc. The four types of compactors are vibratory roller, plate-type, jumping jack, sheep's foot. Generally you cannot use one type of compactor for all conditions. There is another type used for trenches and that is a about a 4 - 6' wand with pressurized water which is injected into the area. Water displaces the air pockets and as the water drains away gravity pulls the soil down resulting in compaction. Nice to keep in mind when digging and refilling trenches since dirt tends to expand by 30% when uncompacted.
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Foundation compaction
There are other hybrid options too.
Piers. Piers consisting of augered holes down to solid earth or rock filled with concrete. The piers would likely be spaced 6' apart filling the entire footprint. The floor could be poured monolithically with the piers. Load bearing walls could benefit from pier loactions.
Pilings. My builders license instructor built an entire house on pilings in swampy land (pre wetlands law). Pilings look like telephone poles and driven into the ground (sometimes 70') and terminate either at or below ground. The building is built upon them. This is very common in the South. However they drive them into the ground one atop the other with as much as 28' sticking out of the ground.
Grade beams and footers. Footers could be dug to stable ground. Rather than remove and not replace all the dirt inside, grade beams made of concrete connected to the walls and reinforced, lay in a trench at or just below grade. Grade beams would go under load bearing walls. And they would support the poured floor.
Basement. If you want more space and less cost to backfill, build it conventionally with wood or steel foor joists, and wood floor.
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