· Crushed Stone #57 Cost . Crushed stone #57 is the second layer of your driveway. It goes on top of item #4 or gravel #3. This is an irregular stone roughly the size of a golf ball. It is also a machinecrushed stone but rougher than the others. You want at least 3 4 inches of this material to facilitate drainage beneath your final gravel. It is frequently made from limestone but can be made ...
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