From what I can ascertain from the UAC book, that course does not exist. What you can do is a standard Science/Arts cource (392759) and simply do an honours year for science (and/or arts) at the end of the double degree. You'll end up with the same qualification, but the only limitation is that some majors that are offered to advanced science students are not offered to standard science students, from what I can see in the science manual.
Best to contact the faculty of science for more info.