I don't have one at home, but I have a stack at work......See your Unit for one of the "Employer's Information" packages ( or whatever it is called ) which has a lot of information for your employer as to what you are doing in the Reserves, legislation protecting you, and your employer, etc.
Are you even able to attend a Summer BMQ in BC? You can probably still attend weekend BMQ in the Fall and Winter.
You need to talk to both your Unit and your employer and find out what concessions either or both can make. If neither can offer a solution, you will have to make up your mind what career path you want to take.