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From the source

Paragraph 3.2.2 tells us that the contractor should preserve all anchors and use the method in the specs to remove the existing nuts without damaging the threads of the existing anchors. How much effort is the contractor require to put into removing these existing nuts? These bolts have been embedded in concrete for over 60 years and experience tells us that in most situations it is almost impossible to remove these nut without damaging the threads of the existing bolts. Questions: 1. Has the government.