More than 50 coal ash spill cleanup workers and workers' survivors are suiing Jacobs Engineering for unsafe working conditions that they allege lead to sickness and death at the cleanup site. When the Environmental Protection Agency arrived on the scene of the nation’s largest coal ash spill, the agency was worried about the hundreds of blue-collar laborers already toiling in the toxic stuff without protection, newly reviewed records show.EPA independent testing of the 5.4 million cubic yards of coal ash that had spilled from a dike at the TVA Kingston Fossil Fuel Power Plant in Roane County in December 2008 was showing alarming levels of radium and arsenic, records show.Independent researchers from institutions such as Duke University and Wake Forest University also were finding high concentrations of arsenic and radium.