Carson Richert was home alone Monday. His wife was visiting her daughter and with a day all to himself, he decided he would work on his Corona home’s manicured lawn. He was busy toiling away when he suddenly realized he was in trouble. Less than a few hundred yards from his home, the Canyon Fire had burned its way over the hillside near San Ramon Drive and was ready to pounce on the homes in the exclusive Corona community. “I didn’t even know the fire was going on,” said Richert on Wednesday when he returned to his home after Corona fire and police officials lifted a mandatory evacuation order late that morning.