Ms Pamela McDonnell:

As part of the monitoring at a licensed site, there are grab samples, which reflect a point in time, but there are also composite samples. Composite sampling takes a small amount of sample over the entire period of the flow of discharge. That gives us a sense of what has happened within the previous 24-hour period. From the data we have seen, the composite samples show that the worst-case ammonia levels that went out were from the grab sample on 12 August. Everything before was much lower. We have a good picture of what happened across that whole period. We have also looked at continuous monitoring data on the site. All of the on-site records have been cross-referenced.