It is very challenging to actually measure many of the radionuclides in radioactive waste. It's difficult. It's easy to measure something like cobalt-60, which is a powerful gamma emitter, but for many of the beta and even alpha emitters, it takes pretty specialized equipment.
When waste is mixed—potentially low- and intermediate-level waste—it's difficult to know whether it should be classified as low or intermediate. Our concern is that a lot of intermediate-level waste that's mixed is now being categorized as low-level at Chalk River so that it can go into an above ground mound.