Drivers around the Woodruff Road area near Roper Mountain Road may see an alarming sight Wednesday night, but Greenville city officials say it is not cause for alarm.Beginning at 9 p.m., AmeriGas will conduct a “burn off” to service the liquid propane tank at Costco, located at 1021 Woodruff Road, according to a release from the city.The process, which takes about five hours to complete,