Trenton Jensen, Skyward Aerial Imaging
SALT LAKE CITY — The subdivision developer where a North Salt Lake landslide wiped out one home on Tuesday and threatened several more said it could take months to clear the earthen material and stabilize the mountain.
"We'd like to get it taken care of before the snow flies, and that is optimistic," said Scott Kjar, vice president of Eaglepointe Development.
North Salt Lake officials and Kjar's company are waiting until the earth dries out and probes can be inserted to measure any movement in the landslide how much water is present.
"We need to determine if it is moving and put together a plan that will prevent damage to any other homes," Kjar said.
Eaglepointe has arranged for emergency housing accommodations for displaced families and will follow the engineering lead of North Salt Lake city officials.
"It is wait and see. I can't make any prognostications," he said. "We just have to wait until we get the information back from the engineers and get our plan together with the city. We need to do what is prudent and reasonable based on what (the engineers) see."
City Manager Barry Edwards said a team of experts has declared the landslide site off-limits until it has a chance to dry out.
"We did not get as much rain as we thought (Tuesday), so the hillside is moving at a much slower rate than it did in the past," he said. "There is still sloughing a little bit. Our plan of action is weather dependent and all of the geotechnical people agree that you can't get on top of the slide until it has a chance to dewater."
Clay and gravel
Kimm Harty, deputy director of the Utah Geological Survey, said a number of factors were likely at work to cause the landslide, including easily shifting gravel material sitting on top of clay, the presence of water and slope of the mountain.
"The rain could have been the last straw, but this sounds to us that this was a landslide in the making for quite some time."
Landslides are a common occurrence throughout Utah, she added, but as urban development encroaches on hillsides, risks can increase.
"We have looked at a number of large landslides in the last five to 10 years, with many of them impacting a road or transportation. They have not been hitting too many houses," she said. "In wet years, you have landslides in urban areas all over the place. This one is pretty big, bigger than what anyone would have expected."
The Utah Geological Survey maps geological hazards throughout the state, including landslides, but does not perform risk assessments on private property, she said. The information the agency collects is shared with city and county governments to ensure the most current data can be incorporated into land planning decisions.
"People trust their governments. If they are allowed to build a house on a piece of land, they think it is safe, and that is not always the case. You can tell people to do due diligence," she added, "but should homeowners be expected to do their own landslide investigation? Government is not going to get it right 100 percent of the time, but they do need to do the best they can to get it right."
Eaglewood and Eaglepointe
Kjar said the Eaglewood and Eaglepointe subdivisions that occupy the bench in North Salt Lake include 1,500 homes that were built in 19 phases — the last of which has been idled due to the landslide.
The homes were planned and plotted with layers of review that included geotechnical engineers who assessed slope stability and suitability to build, he said.
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