Hi, I added more important information about foot compactor.
For the cohesive type of soil, it is used. G45 is a nominal value of CBR 45 of natural gravel.
Site engineer can be allowed to adopt any type of compaction method but it must be placed and mention in Indian Standard codes or ACI. Compaction techniques are used basically on locally available machinery and type of soil available. Many times it depends on climatic conditions and availability of labours and contractors.