Central Columbia School District superintendent Harry Mathias says the contract for the district's maintenance, custodial and cafeteria staff expired in June.
About a month ago, Mathias says, the Pennsylvania State Education Association sent a letter to the district saying union members would no longer work overtime.
Mathias asked for volunteers to plow if needed, and building and grounds chief Ralph DeFrain held a day of "plow school" to teach them how to work the equipment.
Mathias and three other school officials spent part of the weekend clearing the grounds.
