Tire-Derived Aggregate as Landslide Remediation/Slope Stabilization

The Geysers Road Project site is located in Sonoma County southeast of the town of Geyserville and approximately 1.7 miles north of the intersection of Geysers Road and Red Winery Road. In 2006, approximately 250 feet of Geysers Road failed due to a landslide, requiring the slope and roadway to be reconstructed. The landslide was caused by a combination of loose native soil and excess ground moisture (saturated conditions).

Geysers Road failed section.

Geysers Road failed section.

Excavation of failed road section

Excavation of failed road section.

Sonoma County had initially designed the repair of the landslide-damaged road section using a traditional soil backfill approach. During the summer of 2008, the California Integrated Waste Management Board (CIWMB) (now the Department of Resources Recycling and Recovery, or CalRecycle), working with Sonoma County, provided the tire-derived aggregate (TDA) material, design and construction management services to redesign and then rebuild the road section using TDA as a lightweight backfill.

TDA placement over geotextile fabric

TDA placement over geotextile fabric.

Completed TDA road repair project

Completed TDA road repair project.

This resulted in a smaller excavation and a lower-cost repair. This project used approximately 150,000 waste tires and resulted in an overall cost savings to the county of $370,000.