I would like my colleague to answer that one. However, before he does, I would just like to point out that an environmental assessment is not a contract. It is a study designed to determine concrete action required. What did in fact change, was technology. Studsvik technology was not around in 2006. As a result, it was a matter of deciding whether we could use existing technology.
On March 8th, 2011. See this statement in context.