(KCCR) — An employee of a subcontractor working to build the first phase of Pierre’s new drinking water treatment plant was injured last week in an accident on the work site. P-K-G Contracting owner Darin Pfingsten declined a recorded interview for this story but did provide details of the accident. He says a male employee of Swingin Construction of Grand Forks, North Dakota was framing a box made out of steel beams for sheet piles inside the water intake facility. Crews were trying to finish one more section before the end of the day when a heavy beam broke free from its rigging and struck the worker, pinning his lower leg and causing a serious injury. Pfingsten says the man was taken to Avera St. Mary’s hospital then transferred by air to a Sioux Falls hospital for further treatment. The incident happened last Thursday. Crews did not work last Friday and put together a plan of action prior to resuming work this week. Pfingsten says officials from the Occupational Safety and Health Administration have been on site after the accident and are pleased with overall safety of the work site.