(1) Bins, bunkers, hoppers, and fuel houses. Guarding. Open bins, bunkers, and hoppers whose upper edges extend less than three feet above working level must be equipped with standard handrails and toeboards, or have their tops covered by a substantial grill or grating with openings small enough to prevent a person from falling through.

(2) Fuel hoppers must be provided with doors that may be remotely operated.

(3) Fuel hoppers must be provided with platforms with standard railings and adequately lighted for the protection of workers taking out fuel.

(4) Fuel bins must be provided with an approved railed platform or walkway near the top or other approved means, for the use of employees engaged in dislodging congested fuel. No employee must enter any fuel bin except where adequately safeguarded.

(a) Recognizing however, the varying designs of fuel storage vaults and the type of fuel handled and certain peculiar local conditions, the adequacy of safety devices must be determined by a duly authorized representative of the department of labor and industries, division of industrial safety and health.

(b) During operations when the flow of normal fuel is interrupted but dust from operating sanders is received in the bin, workers must not enter the fuel bin until the flow of sander dust has been discontinued and the dust has settled.

(c) Use of wheeled equipment to load bins. Where automotive or other wheeled equipment is used to move materials into bins, bunkers, and hoppers, adequate guard rails must be installed along each side of the runway, and a substantial bumper stop provided when necessary.