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 - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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