(a) An employer may choose to develop workplace chemical lists by work areas, pursuant to the Act, §502.005(c). However, the workplace chemical list threshold of 55 gallons or 500 pounds must be applied to the aggregate amount of the hazardous chemical in the workplace, even though such chemicals may be present below these thresholds in each work area.(b) If an employer chooses to subdivide a contiguous facility into separate workplaces, a workplace chemical list must be prepared for each separate workplace.(c) Employers may use the department's model form in developing workplace chemical lists. This form will provide a recommended format for the workplace chemical list, but is not mandatory.