There was one story that Clinton killed the study. Nobody has provided any evidence to support that, except to say "See Federal Register."
I did some research (link below), and conclude that if Clinton did kill the study, he did so with the approval of Congress - and in fact, it appears as though the Congressional conference committee killed the study.
http://www.freerepublic.com/focus/f-news/1478248/posts?page=82#82
You might also find some information about the Sierra club law suit and envrionmental weenies stopping it.