Employees may need training when their job duties involve hazardous chemicals in the workplace, regulated transportation functions, hazardous-waste management, or assigned duties in covered hazardous-substance emergency-response activities. The required training depends on the work performed.

No. An employee may be subject to both OSHA HazCom and DOT requirements. Some content may overlap, but DOT requirements are met only to the extent the training covers the required DOT components.

No. HAZWOPER applies to specific hazardous-waste and emergency-response operations. Employees who also perform regulated transportation functions may need DOT training.

Yes. Under the U.S. Department of Transportation (DOT) Hazardous Materials Regulations (HMR), all hazmat employees must receive General Awareness/Familiarization Training as part of their required hazmat training program. This training helps employees recognize hazardous materials, understand the purpose and scope of the regulations, and identify how the requirements apply to their job functions. Note that general awareness training might be a pre-requisite or separate training course needed to fulfil DOT training requirements in addition to a DOT 49 CFR course. 

They may. Employees who load, unload, or handle hazardous materials in transportation may be DOT hazmat employees. Warehouse workers may also need HazCom information and training to the extent necessary to protect them in the event of a spill or leak from sealed containers.