The employees were bringing the paper machine back online. The waste paper stock went into the overflow chest to be returned to pulp. An employee went out to observe the overflow from the chest in the street to make sure the sewer drain did not clog. As the employee was standing by the sewer drain, the condensate tank released to the same area. The condensate, mixed with the product from the overflow chest, caused the product level at the curb to rise over and into the employee's boots burning his feet, ankles, and lower legs.