On a practical matter, two of the times suggested coincide with the natural resources committee. They're at the same time. I don't know if any other members of the special legislative committee sit on natural resources, but that would present a problem. It sits on both Mondays and Wednesdays from three to five. I would imagine that natural resources and the environment would be the two most involved in this, so we would want to avoid overlapping those two committees wherever possible. It's my understanding that these times don't interfere with the environment committee, but they do with the natural resources committee.
Evidence of meeting #2 for Bill C-30 (39th Parliament, 1st Session) in the 39th Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was witnesses.
A recording is available from Parliament.