The excavation, processing, handling and short-term storage of slag pursuant to a permit under this act shall not be subject to the act of July 7, 1980 (P.L. 380, No. 97) , known as the Solid Waste Management Act, if the slag is residual waste as defined by that act, and regulations promulgated pursuant thereto, and if the slag to be excavated, processed, handled or stored on a short-term basis does not contain solid waste other than slag.
52 P.S. § 3304.1