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With years of experience in building roads I would suggest the following
1. Work in dry weather if possible
2. Excavate a minimum of 6” for the drive way, preferably 8”. More is better.
3. Compact sub grade with vibratory tamper or small roller.
4. Apply fabric on sub grade, staple in place.
5. If possible find a local source for crushed concrete (usually construction companies that do road work) and place in two lifts compacting each with the vibratory tamper.
I suggest the crushed concrete as in my experience it packs in and sets better than most stone. If you want to try to keep your lawn I have actually used this method excavating an extra 4” then covering the area with more filter fabric and placing top soil over the stone to grade then seeding. That way you have a green driveway.
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