Federal attorneys have filed more charges as they continue an investigation into Clean Air Act violations at the Westward Seafoods plant in Unalaska.

Between 2009 and 2011, James Hampton was the engineer in charge of Westward's powerhouse. That includes a water injection system for reducing potentially harmful emissions of nitrogen dioxide. 

Prosecutors say that pollution equipment was mostly turned off on Hampton's watch. And now, Hampton is facing a felony charge for giving false data to his environmental compliance manager to make it look like the pollution system was up and running.

Hampton's also accused of misleading federal regulators. When the Environmental Protection Agency inspected the powerhouse, Hampton allegedly turned the pollution equipment back on and gave the impression it was in regular use.

Hampton is facing up to two years in jail and a fine of up to $250,000. The same goes for Westward's former powerhouse supervisor and powerhouse operator.

All three defendants are working on plea agreements with the U.S. Attorney's Office.