NEW YORK — Construction workers digging at ground zero have uncovered a 40-foot pothole and other features carved by glaciers about 20,000 years ago. Unearthing these glacial features has been critical in preparing the foundation for Tower 4 of the new World Trade Center, being built by Silverstein Properties at the southeast corner of the site. Engineers need a clear understanding of the contours of the rock....... "It's nice to look at," said Robert B. Reina, a supervising structural engineer at Mueser Rutledge, "but it's all got to go."
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