Life lesson missed
The lifeguards state responsibilities of their job deserve higher pay. If so, then act like an adult. In real life -- you don't always get your way. Then they state that they didn't know what the pay rate was. Did you ask? The recreation department missed an opportunity to teach a real life lesson to these lifeguards. In reality, a private employer would redo the schedule the best they can and look for replacement employees Anyone at any time can be replaced.