Walt Tamosaitis...working as a federal contractor [for URS Corp.] on the Hanford Waste Treatment Plant (WTP) project, which he described as “our nation’s most contaminated facility, containing two-thirds of the nation’s high level nuclear waste.” It’s an Energy Department program, run by Bechtel Corp. and URS Corp. as the prime subcontractors...[In] June 2010, he submitted a long list of technical issues that needed attention...“I was suddenly terminated from the WTP job and escorted off the premises after I continued to raise valid safety and technical concerns,” he said [in Congressional testimony]...URS declined to comment because Tamosaitis’s case is in litigation...The congressional panel is considering legislation that would extend whistleblower protections to employees of government contracting companies... Bechtel...is contesting Tamosaitis’s allegations. Bechtel national spokesperson Jason Bohne said, “We have not and will not tolerate retaliation or harassment in any form against anyone who raises issues.” A recent independent study, he added, found “no widespread evidence of a chilled atmosphere adverse to safety, or that WTP management suppresses technical dissent.”