States are facing a host of challenges in reducing a backlog of more than 96,000 leaking underground storage tanks (LUSTs), including staff and budget cuts, a growing number of entities responsible for leaks and the possibility that newly approved ethanol fuel blends could increase the number of leaks, state and industry sources say. EPA is poised to release this spring the results of a years-long review of LUST cleanups, "The National LUST Cleanup Backlog: A Study Of Opportunities," which, according...