Northwest Pipeline, says Washington State Department of Ecology Section Manager for the Toxics Clean-up Program Valerie Bound, has had natural gas lines throughout the state for many years.
In 1990 the national company decided it wanted to clean up its properties, having discovered some of the pipelines that carried its products were contaminating soil with mercury and arsenic. Seven drums of soil containing these contaminants were removed from the company's meter site at 141 Lindsey Lane near Grandview in 1992, according to Department of Ecology officials.
Because the company owns so many sites in the state, the process to clean up all of them was lengthy, according to Bound.
The company, however, participated in the DOE's voluntary clean-up program and removed 9.34 tons of mercury-contaminated soil from the Grandview site between 2008 and 2009.
In conjunction with that effort, said Bound, the company cleaned up its site near Sunnyside, located at 9390 Emerald Road.
The Grandview site, she said, has been deemed safe and the DOE has made available for review and public comment all documents pertaining to the clean-up.
The DOE is proposing the removal of the site from the hazardous sites list, and the Sunnyside property will soon be ready for the same process.
Bound said the Sunnyside property is currently undergoing performance monitoring to verify the clean-up is complete.
"That's a one to two-year process," said Bound.
She said the DOE is pleased Northwest Pipeline has taken the steps necessary to clean up its properties on a volunteer process.