![]() ![]() 23 report from the Dan Brown firm suggests an explanation. ![]() Soon after that letter, however, the city released data showing that over the four day period that the first 24-inch support pile was installed, the building had in fact tilted an additional quarter of an inch.Īlthough it does not mention any monitoring data, the Nov. ![]() Although acknowledging that amounted to an exception to the agreed-to provisions of the testing program, Hamburger said the city’s own appointed design review panel “does not believe this is necessary.” 30 letter – that “settlement monitoring indicates that no additional settlement or tilting occurred as a result of this 24-inch pilot installation.” He notified the city that the Dan Brown firm would no longer be present during upcoming testing. Seven days after that memo, fix designer Ron Hamburger notified city officials – in a Nov. The hope was to prevent losing ground under and around the foundation, because experts say it is a key factor in triggering building settlement. 23, obtained by NBC Bay Area, the firm revealed that more than five tons of soil had been inadvertently removed during the test pile installation. In a technical memo to a city building official on Nov. When the first of a series of 24-inch wide test piles was sunk to bedrock over four days in mid-November, the firm generated another report. 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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