Grass Valley Sink Hole Raising Concerns For Highway 49

Grass Valley CA (CBS 13)- Cal trans is monitoring a potential safety hazard on hwy 49. Part of highway 49 south of grass valley has been sinking and there is concern over the roadway collapsing. As all the water from these soaking storm systems sinks into the ground, the  soil along the path to the underground reservoirs erodes and weakens. This can lead to sinkholes or unstable roadways. We are seeing just that on hwy 49.
Janurary 25th a crew went out and bore holes in the roadway in