SAN FRANCISCO (AP) - An expert says that more than 600 high-strength rods and bolts used to secure seismic equipment on the new span of the San Francisco-Oakland Bay Bridge are harder than the typical levels and are vulnerable to cracking.
According to the San Francisco Chronicle, newly released test results show that those rods and bolts are above the at-risk hardness threshold of 34 set by bridge specialist John Fisher, a member of Caltrans' team of independent experts.
Fisher says the results from corrosion-simulation tests on those rods could determine whether they may need replacing.
The hardness question arose after the 32 seismic safety rods broke after being tightened in March.
The bridge's $6.4 billion eastern portion span scheduled to open Labor Day weekend is in doubt as officials say they will make a decision next month.
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