Abstract: On or about August 28, 2018, Employee #1 was tasked with delivering a Putzmeister Model 32Z-Meter truck-mounted concrete pump with integrated placing boom (concrete pump truck), Vehicle Identification Number 1M2K197C87M034048, to a highway construction site. Employee #1 arrived on-site where a concrete finishing crew and a concrete ready-mix truck met Employee #1. Employee #1 opened a snap-type valve clamp pin and used a hammer to strike the valve clamp that was near the pressure elbow of the hopper. The metal pipe attached to the pressure elbow released from its position due to stored pressure and struck Employee #1 in chest or head area. Employee #1 was thrown down an embankment. The employees brought Employee #1 to the road area, called emergency responders, and administered first aid. A local ambulance service arrived and transported Employee #1 to a local hospital. Employee #1 was pronounced deceased upon arrival.