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Los Angeles Times
Part of Palos Verdes Drive South damaged by landslide will close temporarily for repairs
By Jireh Deng,
2024-03-22
For the record : 8:48 p.m. March 22, 2024 : An earlier version of this story incorrectly characterized a grant from the Federal Emergency Management Agency. The grant amount is $23.3 million, not $33 million, and a portion of that money will not be used to pay for emergency hydraugers.
Palos Verdes Drive South is a major two-lane road that spans a roughly 5-mile stretch of the California coast along which 15,000 vehicles pass every day, officials said. At the moment, visible cracks in the asphalt can be seen where the road has fallen into disrepair due to shifting sediment.
"We're doing short-term repairs right now," said City Manager Ara Mihranian. But an "imminent road closure" will take place over the next month to address a "severe drop" in the roadway that locals call "the ski jump," he said.
Caltrans officials are recommending that this section of roadway be flatted out to some extent, Mihranian said. The section runs between Narcissa and Peppertree drives. Details of the planned road closure and its repairs will be presented to the City Council on April 2.
The land in some areas is descending toward the Pacific Ocean at a rate of about half an inch a day, according to Michael Phipps, a geologist working for the city. The landslide has already damaged some homes and recently forced the closure of the historic Wayfarers Chapel, a popular wedding site perched on a hillside overlooking the ocean.
A particular type of soil makes the Portuguese Bend especially vulnerable to landslides, Phipps said. Millions of years ago a volcanic eruption deposited ash that became bentonite clay. "When [bentonite] gets wet, it becomes even weaker," said Phipps. "So we've really got the worst of all situations."
The city is using underground pumps called dewatering wells to drain the water table to help stabilize the land, officials said. The city has also halted development in certain affected areas. So far, Mihranian said, only two damaged homes have been marked as uninhabitable.
The Federal Emergency Management Agency has selected Rancho Palos Verdes for a $23.3- million grant to help with remediation efforts.
"There's other discussions about trying to intercept the water that's coming down to natural canyons up into the head of the landslide," Phipps said. But all the city's measures will at best only slow the landslide to imperceptible movement, not completely stop it, he said.
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