OSHA Reference: 1910.1000 e
There is an expectation that all chemical exposures will be controlled by engineering controls, for example, laboratory hoods and local exhaust ventilation are used to minimize the potential exposure to hazardous chemicals.
When such controls are not feasible to achieve full compliance, protective equipment or any other protective measures shall be used to minimize employee’s exposure to air contaminants. Any protective equipment and/or technical measures used for this purpose must be appropriate for each particular use, contact industrial hygienist or other technically qualified person.
There are several exposure control measures that are common throughout the site. The following is a description of each and how the effectiveness of the control is maintained.