Ms Geraldine Larkin:

It was a desktop study. That being said, the standard and the test protocols that were developed at the time did in fact lead to the identification of deleterious materials. The current revision is taking the subsequent learning from that and simplifying the testing protocol. The original tests prescribed in IS 465 did identify deleterious materials, notwithstanding the fact that, as the Deputy says, it was based on a desktop study at the time available. That reflects the evolution of the knowledge and information that is coming towards the NSAI and indeed coming to the committee.