Grass Valley sinkhole repair coming along (VIDEO/Slider) |

Grass Valley sinkhole repair coming along (VIDEO/Slider)

The Grass Valley Public Works Department is making significant headway on its $2.9 million project to repair the 100-foot-deep sinkhole that opened up in January on Freeman Lane.

Construction workers have reconnected a missing section of corrugated metal pipe that was broken inside the sinkhole and have began filling in the area with dirt up to about 20 feet high, according to Public Works Director Tim Kiser.

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Workers are now lining the inside of the pipe with concrete, which should prevent the sinkhole from reopening in the future, Kiser said.

The sinkhole was created when a culvert underneath the Tripp's Auto Body parking lot failed, but the exact cause of that failure is still unknown, according to Kiser.

So far, the repair process hasn't revealed any major clues.

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"All we have found are totally crushed pieces," Kiser said.

Any leads as to what caused the damage are "pure speculation at this point," he said.

"We're focusing on trying to get this back open and fixed as fast as possible."

The repair project is expected to be funded by the Federal Highway Administration because Freeman Lane is a designated federal roadway, according to Kiser.

To contact Staff Writer Matthew Pera, email or call 530-477-4231.

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