I just started at a small rural hospital that sounds very similar to your unit. We do 10-15 deliveries per month. Our nurses are also only ON CALL. We actually have about 7 nurses that work on our unit. We are scheduled for 12 hour call shifts just like any other schudule. However, we are paid $10/hr to be on call and time and 1/2 when we are called in. Some nurses like to do 5 call shifts per week, others only do 2-3. We even have one nurse who does one 24 hr call shift per month. This system works well for our unit. We have 30 minutes to get to work once called although we are usually there in 15 or less. We have a wonderful working arrangment, we all support each other, our nurse manager is more than willing to come in when things get hairy(as are everyone else). Hope this helps. It really is a system that can work but I think you definetly need more than 2 nurses. Thats an awful lot of work for two people.