Box groups of containers so that they can be carried easily by hand. Give information to the pick up personnel as necessary. Special handling should be described when necessary, e.g. for refrigerated materials, reactive or volatile materials, highly toxic materials, etc. Identify bottles with caps that are left ajar. Identify all chemicals going for disposal.
Unknowns require testing for class of hazard and are expensive to dispose.
Costs may have to be paid by the originating department. Request hazardous waste pick up from the Department of Public Safety. Provide a description of the material to be handled and the specific location of the material. Provide the name of someone who can verify that the correct materials are to be picked up. Most hazardous materials will be picked up within three work days of the request.