Abstract: At 4:00 p.m. on October 8, 2019, was at the top of a fixed ladder on the storage tank gauging the level of the tank while a coworker was operating a nearby swabbing rig. The coworker called out to the employee to have him come over to the well to help him but there was no answer. The coworker went over and found the employee passed out on top of the tank, lying on his side with his head down inside a large open hatch on the tank. The coworker pulled the employee away from the hatch and called for emergency services. It could not be determined why the employee had the hatch open because the tank gauging stick was in a small four inch opening near the ladder. The employee was hospitalized for treatment of gas inhalation.