Muni's official explanation for the delay is that “the concrete being used in the project is not hardening as quickly as designed.” At the moment, neither Muni nor contractor Shimmick have a working rationale as to why the cement did not dry at Sunset and Judah but did dry at 19th and Judah. It's a beguiling situation, and several cement contractors contacted by SF Weekly were at a loss to explain the delay — without using lots of profanity.
“They fucked up!” said one contractor of the weekend job. “The weather was ideal all weekend. It should have set.”