(St. Cloud, MN) -- A former employee who admitted starting fires at the Martin Marietta granite quarry in Waite Park has been sentenced to 10 years in prison and must pay over 665-thousand dollars in restitution. Prosecutors say 47-year-old Raymond Curtis caused more than two-point-six-million dollars in damage when fires were set inside dump trucks, buildings and other vehicles. Curtis had been fired just before the 2015 incident and employees said he'd made threatening comments about the company.