I'm not sure what the problem is. All you need is a strobe light, to check how fast the shaft turns when it freewheels. Put a mark on the shaft, then observe when the blower is freewheeling. When your mark doesn't move, read your rpms off the strobe.
Most municipalities will have standard specifications; paving and such are so dependent on traffic expected and uses, not much can be said until the project is located. You also need to look at geotech info, I've done a lot of work that needed subsoils to know what world I was in. (East...
Here's a video of one; you can't realistically drill and expect loose sand to consolidate. so what you do is move the snd with a kind of Archimedes' screw, and get the sand out of the way, so you can do your thing on the solid stuff below. It's used in mining more than in drilling, from what...
