Gov Mitt Romney asks Massachusetts Turnpike Authority chairman Matthew J Amorello to resign as head of Big Dig project in light of reports that state engineer knew in 2001 about leaks caused by poor construction in tunnel and nothing was done to fix it; Amorello says he plans to manage job until it is finished; $14.6 billion Big Dig, replacement of elevated highway with underground expressway in Boston, is slated for completion in 2005 (M)
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