Mohd Shamsuri Khalid, Ahmad Rahman Songip, Nooh Abu Bakar, Mohtar Musri, Risk Based Assessment of Underground Storage Tanks in Petrol Station, Journal of Engineering and Applied Sciences, Volume 10,Issue 8, 2015, Pages 238-242, ISSN 1816-949x, jeasci.2015.238.242, (https://makhillpublications.co/view-article.php?doi=jeasci.2015.238.242) Abstract: Ageing Underground Storage Tanks (USTs) have come with risks whereby failure due to loss of containments can potentially cause catastrophic damage to humans and environment. The failure due to loss of containments such as oil and gas may triggera domino effect-explosion. This study aims to introduce an alternative method to assess the fitness of the underground storage for operational purposes. Therefore, Risk Based Assessment (RBA) of the underground storage tank at a petrol station has been carried out. RBA consists of three maincomponents: policy, technical factors and maintenance. The result of the RBA provides improved monitoring and supervising of the integrity of the underground storage tank within an acceptable risk range. This RBA can be implemented, replicated and uses by other petrol stations. The results demonstrate that the investigation of the RBAs associated with underground storage tanks, especially those containing polymer material is worthy to be further pursued. Keywords: Petrol station;Risk Based Assessment (RBA);underground storage tank;introduce;petrol station