That, I can provide some information on.
We have tracked that there was a small quantity of some obsolete chemical agent, as well as some arsenic, I believe, that has been encased in an eight cubic metre concrete block. It was buried in AECL at a site that was dedicated to the management of waste and low-level radioactive waste. Subsequently, we worked with AECL.
DND and AECL worked together to dig that up and then properly dispose of it.