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Thornton Quarry transformation part of ‘largest civil engineering project on earth’

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As Leach, of Roselle, Ill., prepared to return to his work at the tunnel’s far end, he looked out across the pale, flat moonscape of Thornton Quarry’s north lobe floor. Normally consumed with the day-to-day efforts involved in linking this tunnel to a larger system underlying much of Chicago, he took a moment to reflect on his job.

“If you stop and think of it, we’re making history,” he said…Please click here to read Paul Eisenberg’s story in the Times.

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