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Mandatory testing

The contractor that is building the first 11.7 miles of the Metrorail extension will be required to test all 11 of the 32-year-old pier foundations that will be used to support the Silver Line's elevated guideway over Interstate 66 and the Orange Line.

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Extensive testing in new safety plan for Metro bridge
Article | The regional airports authority has told the contractor building the Metrorail extension to Dulles International Airport to do safety tests on all of the 32-year-old foundations that will be used to support a bridge carrying trains over Interstate 66.

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