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Stair treads must be resistant. This is especially important for outside stairs exposed to the elements or stairways exposed to wet conditions.

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There must be a stairway or ladder at points of access where there is an ... Must have uniform riser height and tread depth, with less than a 1/4-inch variation. ... Ladders must be kept in a safe condition ... If using ladders where the employee or the ladder could contact exposed energized electrical equipment

cheergirlemi2016

The answer for that question is  {stair treads must be slip resistant......

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