Dry dirt will never compact. The friction between the particles will not let the air out.
On the other hand flooded dirt or clay is hard to compact. While it does not have air in the mix it has water. But once the water drains compaction can happen. Clay will compact better than dirt because of all the small particles to fill the tiny voids. The problem with using dirt or clay under a slab is the organic matter in the mix. This will cause it to settle as the organic matter rots away. If you can get some clay dirt mix; most likely red driveway clay; from a pit that is digging well below any organic matter that would be best.
Nothing (in my mind) compacts better than crusher run; 1 inch rocks to dust; limestone. A small dozer can not rip it up.
Sand never fully compacts. Think of a beach. But once you flood compact it that is it. It will not settle more. This and the fact it has little to no organic matter makes it a good cheap fill.
I would clean any disturbed soil out the hole and fill it with sand. Flood it and let drain. Flood it again and let drain. Once you got the hole filled cover the dirt sand with a fabric and put down a layer of limestone.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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