Knowing me, I would screw up how to change a location .... Could someone PM me or just post the script to allow the USAR to spawn at Station 2 where the HAZMAT is? If you can't, it's fine.
If I recall, there is a topic on replacing the Hazmat with the USAR somewhere if you use the search function. Either me or Texas DPS helped the person do it and we gave step by step instructions. Just need to search via the search box or just search in the alterations. If no luck, I won't be able to help you until maybe tomorrow night depending on how work goes.