I have over 15 years of construction safety experience as a safety manager/director. I have served as an owner’s representative safety leader, as well as a safety leader for general contractors and subcontractors. I am a Certified Safety Professional and an OSHA Construction Outreach Trainer, so I teach OSHA 10 and 30-hour courses and issue cards. OSHA is very specific and clear about holes on working/walking surfaces. OSHA law states that any hole 2 inches or larger must be covered by a material that can support at least twice the weight that might be imposed upon it, must be secured to prevent displacement just like what happened in this case, and must be either color-coded or marked “HOLE” or “COVER” to provide warning of the hazard. This is a very easy fix, and unfortunately is a very common problem on construction sites. In this case, plywood is an acceptable cover as long as it is strong enough to hold 2x the potential weight. We typically use 3/4 inch plywood. What was missed here is that the cover had to be secured. Lastly, the plywood had to be marked – the most common solution is just to use spray paint or marking paint and write “HOLE” directly on the plywood. These simple fixes comply with the law.