A school bus driver has been charged with felony sexual assault in allegedly having a sexual relationship with a 17-year-old boy. Tina Scapin, 39, of Torrington was arraigned Monday in Bantam Superior Court. She posted $10,000 bail after her arrest earlier this month. Police said no assaults involving Scapin and the teenager occurred on a bus or when she was on the job for Torrington’s school bus contractor, All-Star Transportation. The company said Tuesday that she was fired following her arrest. Police released few details because the criminal case has been sealed.