He reported evidence that showed the administration and the engineers who were to be looking out for the best interests of people were aware of another spill in the same area from 1994 on, but they had never released the information to the public and had instead covered it up.
The individual reported findings demonstrating that the administration and engineers, tasked with protecting public welfare, were aware of a spill in the area since 1994. However, these individuals did not share this information with the public; instead, they kept it hidden.