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You got quiet a few answers above, But i think the fundamental question is what is your tank design is it a steel liner tank with a additional liner layer inside for water proofing or is a pocket base, which i see in this case as the steel wall is embedded in the concrete. There are water seals around the tank wall in the pocket see examples of each below, that is the liner one You got that one. There is a waterseal as mentioned above if this seal is not isntalled carefully and if it gets broken or damaged somehow during site pore, the leak at the base can occur. Normally the concrete slab for such tanks have a very high requirement of crack control so i doubt that if thats not considered in design. I would recommend first check the design of the wall pocket (if the leak is there) and confirm with the site notes if the seal is provided. The remedial measures can only be suggested once the cause is known. There are several options which can be adopted.

@UmarMakhzumiThank you for your reply. I ended up finding it in edit => edit shell => reverse wall local 3 axis

Hi, please find shown relation of corner bars to main bars given in guide Raynolds and Steadman reinforced-concrete-designers-handbook-by-charles-e-reynolds-and-james-c-steedman-www-civilenggforall-com.pdf