Chevron USA, at 416 S. Bell Ave. in Ames, which is home to Chevron Renewable Energy Group, reported a layoff of 70 people effective June 18, according to Worker Adjustment and Retraining Notification Act data. In 2022, Chevron had announced its acquisition of Renewable Energy Group in Ames for $3.15 billion. At that time, Chevron REG employed about…