130329-A-ZZ999-002
During construction, the crew encountered this substance, which was a byproduct of the milling operations. In its undisturbed state, it looked like clay. But when the vibration of the excavator disturbed it, it liquefied. They had to mix concrete in with it to stabilize it before it could be moved.

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Photo by: courtesy photo |  VIRIN: 130329-A-ZZ999-002.JPG