Why do you need a covenant? Biblically a covenant is a promise between two people, or between one person and God. It really means "I will do my best" and states some specifics. I know these are adults we're dealing with - but telling them what behavior will not be tolerated takes away many problems in the future.
A Covenant for Employees and Volunteers should include...
Agree to understand and follow the rules
Encourage co-workers to
Encourage young people to
Agree to follow the Behavior Management Policy
Agree to follow the Child Protection Policy
Agree to follow the teachings of Safeguarding God's Children and the policy that goes with that
Agree to participate fully
Agree to support co-workers
Agree to pray
Agree to tell the supervisor if at any time you can't live up to the covenant