With either scenario, you'll need to address the issues as have been mentioned, site drainage and properly compacted sub-base material over the existing. Remove any top soil or undesirable material. Fill needs to be compacted in 1'-0" lifts typically with a vibratory roller and you'll want 95% or better compaction. Moisture can play a role in the material's compaction, (needs to be optimum) just as much as sieve sizes of aggregate. I would want to know the existing or "imported"material will do that. On large jobs its tested, at each 1'-0" lift, using something like a Troxler Nuclear Density meter, the results being recorded etc. If the existing site is stable, and you can achieve good drainage around the pad, as well as compaction, it should be ok. On large jobs they do test bores and analyze whats below for the purpose of determining what needs to be done to build on it.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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