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In Washington, dangerous waste tanks must be marked with labels or signs in order to adequately identify for employees, emergency response personnel, and the public both the waste itself and the major risks associated with the waste contained in the tank (WAC 173-303-640(5)(d)). The label or sign must be readable from a distance of 50 feet. In addition, labels must not be obscured, removed, or otherwise unreadable in the course of an inspection (WAC 173-303-395(6)).