How deep should a driveway base be?

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Tags

1. #gravel
2. #level
3. #allow
4. #driveways
5. #excavate
6. #deeper
7. #traffic
8. #bricks
9. #vehicular
10. #paving
11. #brick
12. #inches
13. #thickness
14. #should
15. #thick
16. #least
17. #driveway
18. #material