Under the Land Disposal Restrictions (LDR) program of the Resource Conservation and Recovery Act (RCRA), EPA is extending the current national capacity variance for spent potliners from primary aluminum production (Hazardous Waste Number K088) for three (3) months. Thus, K088 wastes may be land disposed without being treated to meet LDR treatment standards until October 8, 1997, three months from the current treatment standard effective date of July 8, 1997. EPA is taking this action because it now appears that sufficient treatment capacity exists which is capable of achieving the treatment standards promulgated by EPA on March 8, 1996, the process provides substantial treatment of spent potliners and minimizes the threats posed by land disposal of these wastes, and the treatment and disposal capacity provided for the waste will be protective of human health and the environment because it will occur at subtitle C units. EPA is extending the national capacity variance for a further three months in order to provide time for generators to make contractual and other logistical arrangements relating to utilization of the treatment capacity.