Assigning a human activity to anyone who is in all three groups

Summary

Assigning a human activity to anyone who is in all three groups

Content

I have an application where each employee is assigned to a plant role which signifies their office  location, and a they are assigned a job title role. For example:

 

User Chris Johnson is an accountant for brantford so he is assigned the account role and the Brantford role.  There are many instances where a processes is started through a form event and the following approval human activity needs to be routed to someone that is in two or more roles based off the selection in the start form.  For example, I have a form where our claims department fills out a form (start event) to report a product defect.  The form will contain two inputs called "location at fault", and "department at fault" (which are drop downs containing all