Map shows concentrations of carbon monoxide collected from gas extraction wells at the Bridgeton Landfill on January 24. Readings above 1,000 ppm indicate an underground fire. Radioactive waste is located north of the wells shown in purple.
Updated at 1:25 p.m. to add statement from Republic Services, and at 6:00 p.m. to add comments from EPA.
More radioactive material has been found at the West Lake Landfill in Bridgeton.
The material was detected during radioactivity testing in preparation for the construction of a trench. That trench will separate radioactive waste at the West Lake Landfill from an underground fire smoldering at the adjacent Bridgeton Landfill.
The U.S. Environmental Protection Agency is overseeing the construction of the firebreak trench.
Preliminary work to build a firebreak at the Bridgeton Landfill will begin next week. But a local environmental group is worried about what it could stir up.
To figure out where they can safely dig the trench that will separate the underground fire from the radioactive waste, contractors will test the soil for radioactivity. That involves clearing trees and shrubs away from where the firebreak will be built.
Attorney General Chris Koster has asked the federal Environmental Protection Agency to conduct radioactivity tests at the West Lake landfill in Bridgeton that were delayed because of the government shutdown.