Confined Space, PPE, and a Mixing Station
An employer operates a mixing/loading station where handlers pour a concentrated organophosphate product from 2.5-gallon jugs into a 300-gallon tank. The label requires a respirator, chemical-resistant gloves, coveralls, and eye protection for mixing. The station has a small enclosed shed with a single door and no ventilation fan; handlers report headaches and dizziness after long mixing sessions. One handler has a beard and wears a tight-fitting half-mask respirator; another uses a dust mask because 'it's more comfortable.' The employer provides soap, water, and towels but no change room or separate storage for PPE. Decontamination water drains onto bare soil beside the wellhead.
1. Identify the PPE and respiratory protection failures.
Read the worked answer
Multiple failures. (1) A dust mask is not a respirator approved for the label's required protection and provides no protection against organic vapors; the handler must use the respirator specified by the label. (2) Tight-fitting respirators require fit testing and a medical evaluation before use; a bearded handler cannot get a reliable face seal and must not use a tight-fitting respirator-provide a loose-fitting powered air-purifying respirator or reassign. (3) The label-required gloves, coveralls, and eye protection must be worn for mixing, and PPE must be inspected and replaced when contaminated. (4) Handlers need a decontamination site with soap, water, and towels (present) plus a change area and separate storage so contaminated PPE does not contaminate street clothes. (5) The enclosed shed with no ventilation concentrates vapors; symptoms suggest exposure and require medical follow-up and engineering controls.
2. What should be done about the symptoms and the shed?
Read the worked answer
Headaches and dizziness after mixing are warning signs of overexposure, not normal fatigue. Stop mixing operations in that shed until ventilation is provided, ensure handlers are evaluated by a medical provider (and inform the provider of the product and active ingredient), and review whether the label requires a closed system or specific engineering controls. Symptoms should be documented and treated as a possible incident. Do not resume until ventilation, PPE, and fit-testing issues are corrected.
3. How should the decontamination drainage be corrected?
Read the worked answer
Draining wash water onto bare soil beside a wellhead creates a direct pathway to groundwater and violates the intent of decontamination and environmental protection requirements. Route wash water to a contained area or approved system, move the decontamination station away from the wellhead, and follow the label and state rules for disposal of rinsate. The employer should also provide a change area and separate storage for PPE so contaminated clothing is not worn home or stored with personal items.