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

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.