Mae safleoedd risg uwch yn dod o dan gategorïau C a D ac felly â’r potensial i beri risg yn hytrach na bod bygythiad byw sydd ar fin digwydd – mae'n golygu bod angen cynnal archwiliadau’n amlach.
Higher risk sites fall under categories C and D which recognise there is a potential to cause risk to safety, not that there is an imminent or immediate threat – it means that more frequent inspections are scheduled.