An accident yesterday morning has resulted in the closing of Clemson’s College Avenue while DHEC and other agencies respond to an environmental cleanup. All parking spots along the street are closed at this hour and, according to the city of Clemson, sections of College Avenue will be closed during the cleanup and re-opened as progress allows. A truck used to pump restaurant grease from storage holding tanks blew out a valve at 5 o’clock yesterday morning. Several hundreds of gallons used grease spread along College Avenue from the highway 93 intersection north on College Avenue to the Blue Herron back parking lot on Keowee Trail. Significant amounts of grease made their way into Lake Hartwell.