Grand County landfill slide slowing through end of year
The landslide movement at the Granby Landfill has slowed considerably from the same time last year, according to surveyors.
Surveyors with Souder, Miller and Associates took measurements from various parts of the slide on Sept. 26 and found that movement has slowed drastically in the slide’s “toe bulge” from between .3 and .47 feet last year to between .01 and .03 feet this year.
Buttress points measured showed less than .04 feet of movement, which isn’t significant, according to surveyors.
Grand County has been battling a landslide at the Granby Landfill that threatens nearby Coyote Creek since 2007. The landfill itself was closed to the public in 2010.
In late 2014, county officials said they were nearing the Colorado Department of Public Health and Environment’s requirements for closure.
In early 2015, it was revealed that a cover placed over the landfill to prevent water from entering and aggravating the slide wasn’t functioning as intended.
A cavity was forming underneath of the cover and water was pooling on top.
Complete failure of the cover could necessitate a much more expensive option for stabilizing the slide like a $14 million to $20 million cylinder pile wall.
Another option on the table would be relocating all of the trash at the landfill, which could take years and cost up to $60 million.
But Road and Bridge Superintendent Ken Haynes said recent monitoring showed that water was draining off of the cover properly and the cavitation below the liner wasn’t getting worse.
For now, Haynes said the county intends to leave the cover alone.
“Everything is copacetic right now,” he said.
Movement of the slide slowed between October 2014 and February 2015.
The slide seemed to pick up steam from February through April of this year, with April 10 measurements showing a high of .64 feet over the month before. But movement has dropped consistently from May through September, with .11 feet being the maximum amount of movement discovered on Sept. 26, according to Souder, Miller and Associates.
Certain points in the slide have more or less stayed the same.
Points measured near Coyote Creek showed between .01 and .03 feet of movement, which is comparable to last year.
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