Emergency response personnel faced grueling tasks across St. Bernard Parish on Wednesday, as the receding waters showed the full impact of Hurricane Katrina. Clean up crews labored to skim off a thick layer of crude oil, spilled from a tank at the Murphy Oil refinery, that soiled east Chalmette homes as far west as Paris Road. All the while, rescue teams tended to dozens of calls from residents seeking a way out — many of them people who turned down rescuers just days ago but are now running out of water and food or just had enough of the stench...