Identifying and assessing the hazard is the first step. Once the nature of the hazard is identified, the next question is, â€œHow can we control this hazard?â€ In all chemical hazard management systems, there are four basic hazard control approaches elimination/substitution; engineering controls; administrative controls; and personal protective equipment (PPE) (Sjoberg, 2000: 26).
Elimination and substitution control the chemical hazard by outright removing the chemical from the worksite. Processes may be avoided or adjusted to eliminate the need for the chemical or a safer alternative is substituted in place of a more hazardous chemical. If elimination or substitution is not possible, engineering controls are the next possible choice (Slovic, Baruch, &Sarah, 2006: 84).
Engineering controls control the hazard at its source. These include measures such as substitution, ventilation, and enclosure. The use of engineering controls should always be considered first. Where engineering controls are not appropriate or not enough, administrative controls are considered next (Tversky& Daniel, 2009: 24) Administrative controls involve the work process/worker. These include safe work procedures, training and work rotation. Finally, if the hazard cannot be sufficiently reduced by engineering or administrative controls, personal protective equipment (PPE) is used. PPE includes protective clothing and respiratory protective equipment.
As you can see, as you move through each level of control, each offers less assurance than the previous that the worker will not be at risk of chemical exposure. For that reason, we talk about these as a â€œhierarchy of hazard controls.â€
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