Hi Phillip, I was checking through your map for places to throw the bomb and not be able to get it back, and I eventually found one. Before you enter B from the ramp you can take a left into the room with 4 toxic barrels in a corner, there is a small gap behind this and if you stand on top of it you are able to throw it behind. I can provide screenshots when after posting if my description wasn't great at helping you find it.