to happen. the accidents have been happening. repeatedly on this pipeline. critics say they were largely ignored until the gulf oil crisis. >> this latest leak, 13,000 barrels, was contained inside a pump station, while crews built around the leak. they still don't know the cause. and that's the problem, says representative gutenberg. by phone from fairbanks, he says lack of oversight allows the pipeline company to do what it wants. >> so where have they been? we're constantly told alyeska's gold standard of pipeline integrity and we're looking at it trying to figure out what's happening. >> reporter: alyeska's official dispute the allegations of shotty maintenance, saying they have addressed piping issues an alyeska spokesperson said in an e-mail that we've made numerous repairs. in the umer of 2010, we replaced approximately 600 feet of buried