A second worker in Wichita Falls, Texas, has died from exposure to concentrated hydrogen sulfide at the River Road Wastewater Treatment Plant. David Sheppard, a maintenance mechanic, died on Friday, July 22. His assistant, mechanic Daniel Arredondo, died on July 10 from the same incident.On July 2, the two men were sent to work on a pipe valve that was leaking sludge into the plant’s basement. According to a timeline released by the city, a sensor alarm notified operators of a leak at 2:42 p.m. The mechanics were informed by operators that it smelled “gassy” in the area, and operators
