Perhaps I can give a general answer, and then to Dennis if there's a need for any further technical information.
Of course the surge mechanism is applicable only to the regions that have opted for option A, as Dennis has just explained. The surge option allows for exports to be in excess of 10% of the allocation before it kicks in, and then you have a 50% additional charge on whatever is being paid at the time.
The mechanism was designed primarily with respect to the beetle situation you refer to, and that was a focus of a good deal of discussion between industry and the provinces, particularly British Columbia. So that was designed with this situation in mind, and therefore I don't have the figures about what is projected, the types of cuts, and so on. But so you know, this was designed for that exact circumstance, among others, but it was a prominent one.