A track coach at Gar-Field High School and Prince William County schools substitute teacher was arrested on charges of having inappropriate relations with a minor a few years ago, Prince William police and schools officials said.

Eric Lewis, 27, of the 300 block of Second Avenue in Quantico, was charged with two counts of sodomy and two counts of carnal knowledge. Police said he struck up an an inappropriate relationship with a female student, who is now 17 years old, in 2008 when he was substituting at Potomac High School.

He is the second Prince William schools employee to be arrested this week on similar charges. Gar-Field English teacher Tina Marie Amato was charged Monday with two counts of indecent liberties by a custodian, crimes against nature and use of a communication system to facilitate certain offenses.

Prince William police said school officials learned about the incident involving Lewis earlier this week and alerted police. Prince William Schools spokesman Ken Blackstone said Lewis substitute taught in nine different schools — four high schools and five middle schools — over three years. The last time he was in a classroom was in November 2009, he said. Lewis was immediately terminated from his coaching position and from the substitute teacher list.

Prince William Police Spokesman Jonathan Perok and Blackstone said they do not know why it took several years for the incident to come to light or how it eventually did. Gar-Field Principal William Bixby, however, said in a letter to parents Friday “I want to praise the Gar-Field High School students who came forward to report to staff their concerns about Mr. Lewis.”

Bixby could not be reached for comment.

Lewis is being held without bond in Prince William. A court date is pending.