</font><font color="blue" class="small">( Howz 'bout you ask them to tell you where you can see their work, and see what it looks like after some seasons?
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Getting old. Sold the ranch. Sold the tractors. Moved back to the city.
Here in the North Valley, we use the same road base for driveways that the county uses on its roads. It's crushed rock from the local creeks sieved through a 3/4" screen. So it's "dirty" crushed gravel.
My driveway is 20 ft wide, 260 ft long and 6 inches thick.
The contractor used a JD 210LE and a box blade with hydraulic scarifiers to scrape about 4" of turf/soil before the road base was laid (see attachment)
The driveway was laid in 2" thicknesses with watering from a tanker truck and rolling with a vibrating "steam roller" for each layer.
Total cost, including asphalt paving on the last 30 feet of driveway to satisfy the county encroachment requirements, was about $8K.
I have the FEL and will be getting the box blade. Have others also had a water truck come out between layers to get everything set up or would it be just as good to just do a few inches, use it for a bit, re-grade, add some more base, wait, etc.?
Tinkerer, I didn't use any water on mine. It compacted pretty good dry but as I'm building soon I've left the topcoat off because the road will get pretty beat up - and well consolidated - by construction trucks. I'll do a regrade and lay the topcoat once we've done building.
I think laying down in layers and trafficking in between to compact should work fine.
They didn't use water on mine either. I think what really helped tighten mine up was that they put the shale down first and then ran over it with a track loader and then all the construction trucks in and out really packed it down nicely. Then towards the end of construction, they put the crusher run on top.
I live very close to the area you are talking about getting your shale. I have a shale ( not by choice) 2.5 mile driveway and it is full of potholes. If I had to do it, I would put down dirty crush and run. It is fairly cheap and packs well. then if it ever starts to break down on you you can always hit it with a box blade and " freshen" it up.
this is a topic that has been debated in my rural area forever. I just don't think there is one correct answer.