As of June 1, 2023 the Spill Carts are Located at the following places:

In the Chemistry Building -
Floor 2, North-West Hallway (by Williams Group)
Floor 3, South-East Hallway (by Gillan/Mason Groups)
Floor 4, North-East Hallway (by Messerle Group) - Contains Building Mercury Spill Kit
Floor 5, East-Center Hallway (on Front Side of Building)

In IATL -
Entrance, South Reception/Mail Area (by IMU) - Contains Building Mercury Spill Kit (#1)
Exit, North Lobby of MATFAB (by Loading Bay) - Contains Secondary Mercury Spill Kit (#2)

Carts have been distributed to maximize their accessibility to wet-chemistry labs. Each research hallway has a map, indicating the nearest spill cart(s), the path to the spill cart on that floor, and the location of the building Mercury kit. 

[Map images]

Keep in mind that for many research spaces, the nearest spill cart is immediately above or below you – familiarize yourself with the ones that are near your lab space!