Thornton Quarry transformation part of 'largest civil engineering .Jul 31, 2015 . An aerial view shows Thornton Quarry in Illinois, bisected by .. The first person to start digging line in Thornton was Chicago . The reservoir's floor is 300 feet deep; the treatment facility's intake is 350 feet underground.underground line mine near chicago flowsheet,CLIMATE PROVING HEALTHY FOR UNDERGROUND BUSINESS .Dec 27, 1993 . It is the only public underground warehouse in Illinois. . Casey Bukro, Tribune Staff WriterCHICAGO TRIBUNE . feet of storage space that was hollowed out by mining in the line bluffs overlooking the Mississippi River.
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