Three supervisors that were overseeing the ash spill cleanup in Roane County in 2008 are now saying in court records they saw Tom Brock destroy evidence of dangerous levels of toxic chemicals that workers were exposed to. The three, including an overseer paid by TVA and two construction foremen, say in affidavits filed they allegedly saw Brock intentionally destroy air monitoring results that led to endangering clean up workers. Bock was the safety manager for Jacobs Engineering, a government contractor approved by TVA for the ash spill cleanup. Court documents indicate more than 150 of the 900 workers employed at the height of the years-long clean up are dying or are dead. Many of those sick workers and survivors of the ones that died are presently suing Jacobs. USA Today’s probe showed workers were not informed of the dangers of working 70 to 84 hours a week in coal ash, which contains more than 26 toxic chemicals including arsenic and mercury and has been linked by the EPA to higher cancer rates. Documents showed workers were denied protective gear in violation of the EPA’s order declaring the clean-up site a superfund operation. Federal law makes it a crime if someone working at a superfund site tampers with or destroys monitoring results while knowing to do so would endanger people. An attorney is requesting a delay in the January trial regarding the incident. The U.S. Attorney’s Office has repeatedly declined to comment on whether the office has launched a probe on behalf of the EPA. The EPA declined comment regarding the case.