E - Directly behind you at the start of the level in the corner.

R - Before entering the parking garage with all the Akrid inside. There will be a piece of concrete to the right of the entrance on the slope, it is out of sight, but right behind the concrete slab.

T - This is just after the parking garage and before the warehouse. When you are running toward the warehouse, there will be several tanks on your left, go to the northeast corner here. There will be a small wall that you can't get beyond, it is there, you may need to jump to see it.

H - On top of the exit on the warehouse you leave after fighting some Akrid and Chryatis, you will have to go to the edge and jump up to see it.

A - On the left hand side before you enter the hive to fight the boss, it will be in a small cove-like thing.