Plans for a new asphalt production facility alongside the Petaluma River on the south side of that city have been a hot button issue for more than five years now. After the Dutra plant was approved by county supervisors in late 2010, it was promptly challenged in court by the city of Petaluma and a group of local environmental groups. That case that was dismissed by the State Court of Appeal last week, but there’s still at least one more round of legal arguments being made, as we hear today.