CHARLESTON, W.Va. — The top executive charged in a chemical spill that left 300,000 people without drinking water lied about his role with the company to protect his personal wealth of nearly $8 million from lawsuits, according to an FBI affidavit. Freedom Industries’ president, Gary Southern, repeatedly told investigators he had little to do with the company before it was sold a few weeks prior to the January chemical spill. But an FBI affidavit said Southern had overseen day-to-day operations at the …