I am close friends with the fella running the Winnipeg range. And he's basicly told me the chance of civies being allowed on would be extremely slim.
However, starting a Base Airsoft "Club" would be a good step. Once the club is established you could write for permission for the club to use the range on a regular and per available basis.
If your at Pet maybe you should look into it? The process of starting a base club is not all that difficult. And can be found under CFAO 20-50 Which can boo googled