Ideally, continuous mentoring of CCPs for their associated chemical factors will provide the best associate of conformance to safety standards.
CCPs associated with chemicals factors may include : pesticide on incoming ingredients, preservatives (including acids), mycotoxin and cleaning agents/fumigants used in process areas.
In many of these instances the limits would be already determined.

The challenge is to identify a means to monitor that the limits are being observed on all incoming ingredients or outgoing finished products.
HACCP Chemicals Limits