Also, as I'm not familiar with the Cochrane site locations I will use something more local to me as another example.
Stony Plain/Spruce Grove/Enoch/Alberta Beach are all linked together on B5, A15, & B11.
I have all 3 sites setup as different departments.
B5 - 53.610000 -114.151105 @ 19 Miles
A15 - 53.482957 -113.750510 @ 7 Miles
B11 - 53.676660 -114.349997 @ 11 Miles
As I use priority for all public safety, my BCD536HP will also prioritize by department quick key.
I have B5 as quick key 19, A15 as quick key 7, and B11 as quick key 11.
There is overlap with all 3 sites, based on lat/lon & radius, however department quick key priority will switch to the department with the smallest radius.
Again, just how I prefer to program my favorite lists, with RCMP as it's own conventional system and a separate department for each physical repeater site.
Even county based fire services, they are programmed as their system with departments for each physical repeater location with the radius based on their service area.