We are in the process of improving our ESD workroom. We have ESD workbenches set up with continous monitors. We use sheilded lab coats. Soon we will be applying ESD floor wax so the workers can use foot straps instead of wrist straps (they find them too confining). Much of the assembly work is done on benches designed for the worker to be in a seated position. Here are my questions. Do they chairs need to be grounded even if the workers are instructed to keep both feet on the floor while sitting? Do the chairs need to be replaced with ESD protective chairs?