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CHICAGO | NEMA Chicago | 896 FT | 81 FLOORS
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Posted
Feb 21, 2017, 1:59 AM
harryc
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Join Date: Jun 2007
Location: Oak Park, Il
Posts: 14,989
Feb 20
The hole is filled with water - sometimes clay laden water - to help keep the sides from caving in before the sleeve is driven down.
Spinning off the soil.
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