End Condition to Target a Specific Elevation

I am trying to make an end condition that targets my top of berm elevation on a pond. The pond is going to be constructed adjacent to a roadway that is in fill, so the fill slope will be coming down to meet the top of berm elevation of 17.90. I grabbed the 1:2 fill component and adjusted the target type to Elevation. Now I cannot figure out where to actually set what elevation it is targeting. I want to make this target 17.90 so that I can create my proposed surface and let my drainage sub know about where to put his top of bank.