![]() He pointed to foundation-based data as being more reliable.įoundation-based monitoring data fluctuated less when the tower was partly transferred to six piles in January. In a statement, Hamburger indicated that the rooftop data is prone to weather fluctuations. As a result, the tower is now leaning about a half-inch more to the west than before it was first supported along Mission. One reflects rooftop measurements, the other, foundation-based determinations.īack in January, fix engineer Ron Hamburger pointed to rooftop-based monitoring data as reflecting early success with the reversal of some of the tower’s western tilt following the transfer of the some of the tower’s load onto piles along Mission Street to the northwest corner.īut in recent weeks, the rooftop data is reflecting the loss of the improvement and a trend of worsening tilt. The engineers have relied on two types of measurement to determine lean. In responding to questions about the tower, engineers in charge of the project cast doubt on the reliability of the rooftop-based data they had cited when they declared some early success. ![]() “You spend all this money, but you still have an uncertain result long term.” “As far as remedial work goes, this is just a mess,” said veteran geotechnical engineer Bob Pyke, a long time skeptic of the $100 million plan to fix the troubled tower. Sign up for NBC Bay Area’s Housing Deconstructed newsletter. Get a weekly recap of the latest San Francisco Bay Area housing news.
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