Crews will move two of the four cracked concrete pontoons for Seattle's $4.1 billion Highway 520 floating bridge project off Lake Washington so repairs can be done in drydock. The other two pontoons will be repaired in coffer dams on site. Post-tensioning, injection of epoxy to fill cracks and carbon-fiber wrap are among the repair plans for the pontoons. Repairs for the four are expected to cost $100 million.

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