2. Heavier roller? Normally process grind the field surface only. No need to go deep into the subsoil. Because the subsoil below is already dense. The problem occurs on the surface of the field (earthworms are the culprit). The compactor that can be operated in our school is this size (5 tons) 6,500 THB per day. If it is larger than this (10 tons) 8,500 THB per day. Using a larger roller (10 tons) is not feasible for our school due to size constraints and operational limitations.