These are a few photos taken over the past 3 years documenting the failures of the the three transmission lines (or "duct banks") constructed under Islais Creek. This project was initiated by SF Muni Third Street Light Rail in collaboration with the SF PUC. Currently, the transmission lines are flooded, filled with sediment and contorted by the weight of mud, water and approximately 400 jet grout insertions meant to stabilize the pipe. On the contrary, the weight of the jet grouting has actually caused the tranmissioin lines to sink, as this area is landfill sitting upon ancient marsh mud at least 100 to 200 feet in depth. Land surveyors regulary measure the movement of the lines, and the latest information from the Port of SF, as well as SF Muni, is that the area around the transmission lines will need to re-excavated for repairs. ( which is at least the third time, not to mention the stuck drill bore bit on the south side of Islais Creek) More information and photos to follow.
