New York Times: Doc Mattioli is 85 and does not get around his racetrack in the mountains quite as well as he used to. Even 10 years ago, he would hop into a bulldozer to take care of a rough spot. Now he must use a wheelchair, and his once-booming voice seems several decibels softer. But there he was on Friday, on a muddy, 25-acre patch outside Pocono Raceway, celebrating an accomplishment with his great-grandchildren. Pocono Raceway, carved out of a former asparagus farm 40 years ago, became …