1. Check site dimensions as for method 'A'.
2. Remove grass by cutting away the turf, i.e. organic material.
3. Remove soil to form a level base.
4 The boundary retainer will have to be increased due to the increase depth of crushed limestone i.e. 5" if a poor drainage area (special attention should be given to provide a water escape route). Carry on as for method 'A'. Water escape route can be constructed by the following methods.