Shell says there is no evidence of any sheen in the vicinity . State officials are working with residents to watch for any environmental impact caused by the grounding . The Coast Guard said it was investigating a report that an oil slick had been spotted near the site where the rig exploded. The fuel tanks appear intact , the company says . The drilling rig ran aground during a storm Monday off Alaska 's southern coast .
Shell says there is no evidence of any sheen in the vicinity . The Coast Guard said it was investigating a report that an oil slick had been spotted near the site where the rig exploded. The fuel tanks appear intact , the company says . The drilling rig ran aground during a storm Monday off Alaska 's southern coast .