Chemicals, cleaning agents, or any related substance must be stored separately from food by spacing, partitioning, or locating in an area not food.

by spacing, partitioning, or locating in an area not ABOVE food.
Locating a poisonous or toxic substance in an area that is above food is very dangerous. This is because, the substance may experience an accident which will make it to contaminate the food which are below it. For instance, the toxic substance may spill and contaminate the food that are stored below it.