I will do my best to answer that question, although I'll footnote my answer by saying that I'm not an emergency response expert.
I heard the chair of the petroleum board in Newfoundland say to the media a couple of weeks ago that in fact the recovery of a spill would be very difficult. He estimated less than 5%. He said that in the gulf situation it's currently less than 5%, and he certainly didn't anticipate it being any better on the Grand Banks, or off the Grand Banks in the case of the Orphan Basin. In the environmental assessment there is a statement that cleanup and containment of a spill would in fact be extremely difficult.