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.
This map from May, 2013, shows part of the West Lake Landfill in Bridgeton. The underground fire is shaded in red, the radioactive waste in orange. The 1993 fire was in the north quarry, closer to the radioactive waste.