The department said the cracks were found last week after repairs had been made to damage that occurred in May during a process when cables are stretched through the pontoons for strength.
A review panel looking at the problem is expected to suggest repairs in the first week of July. The department still hopes to float the pontoons to Seattle this summer.
A total of 77 pontoons are under construction -- 33 of them at Aberdeen and 44 at Tacoma. Anchors are being built in Kenmore.
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