Yeah I'm not far from right where RT 2 hits 1000', so I'm typically right on edge of the good stuff. My folks are a couple miles west with another 150'+ or so of elevation. Makes a difference. In my experience the change over typically happens at the drug rehab place on RT 2.
12" is not that crazy, but 24"+ is wild, especially if it's glop. That's for the berks though. We good for keeping power.