We need a new driveway and I am in the process of collecting four bids. So far there is a $3700 price fluctuation from the lowest bid to the highest. We have clay soil. The lowest bid suggested paving over the existing driveway. (out of the question) The next bid suggested 6 inches of a gravel base, the third bid 7 to 8 inches and the highest bid, which is so far only $100 dollars away from the third bid is a 12 inch base. I am still waitinig for one more estimate. What do you think is a reasonable base for clay soil. I know that nothing is crack proof, particularly in the northeast. Help!

