Wanton Endangerment 1st Degree/Criminal Mischief: The Punishment?

My boyfriend and a couple friends did some stupid stuff and are now charged with 1st Degree Wanton Endangerment. They decided to put different objects in some road then ran off. It looks like they dropped the fleeing and evading charge. He said something about criminal mischief but I didn't see that on the docket. He's had a previous felony. What could the punishment be and what could he be sentenced to? We live in KY.