A grand jury is investigating whether a contractor deliberately used inferior concrete to build two runways and paving around concourses and taxi ways at Denver International Airport, a copyrighted story by the Rocky Mountain News said.

Ball Ball & Brosamer Danville, Calif., has been embroiled in a civil lawsuit filed by subcontractors about a year ago that charged Ball with deliberately shorting the amount of cement in the concrete that went into the runways.

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