Tag Archives: void

Sound Transit still working to fill voids

Starting Monday, July 19, Sound Transit will return to Beacon Hill to continue underground exploration and backfilling work near Beacon Hill Station related to the voids discovered last year. Expect restricted parking, flaggers directing traffic, heavy equipment, and some noise. Construction is anticipated to take at least two months.

Among other impacts, the remediation work will reduce 17th Avenue South from South McClellan to South Waite to one travel lane, and drivers will be assisted by flaggers to safely get around the drilling equipment. Further information on the project activities can be found on this PDF.

These activities will be the first phase in the current work plan of exploratory operations to find and fill the remaining voids. The subsequent phases of the work plan focus solely on private property. If you have not been previously contacted by Sound Transit, no work will be on your property.

If you have any questions about the project or the Beacon Hill Station in general, please contact Jennifer Lemus, Sound Transit Community Outreach, at 206-398-5314.

This map shows the section of 17th Avenue South that will be affected by the lane closure, sidewalk closure, and parking restrictions:

View Sound Transit Void Remediation Work, Summer 2010 in a larger map

Sound Transit can’t avoid the voids

The Seattle Post Globe fills us in on the filling of an eighth “void” along the tunnel excavation route at 18th and Lander. Another potential void is also being examined at 17th as well. Crews are expected to complete investigation and repairs by May 22nd.

After the initial report of the sinkhole that rose all the way to the surface, subsequent voids were identified by reviewing records of excavation spoils for abnormally high readings originally attributed to mismeasurement, accuracy, or instrument calibration issues.

BHB reader Heidi wrote this morning about having seen crews working at these repair sites (and being a bit hesitant about answering questions) and pointed out the crumbling retaining wall nearby. Interestingly, in the Post Globe report Sound Transit spokesman Bruce Gray states no structural damage has been reported from these voids and that only a quarter-inch of settling has been measured, and none of that near the void sites.

Thanks Heidi!