(FLORISSANT, Mo., AP) — A city engineer says more radioactive material has been discovered at St. Louis County landfill.

Florissant City Engineer Tim Barrett says he was told by state officials Monday that the additional radioactive waste was found at the West Lake Landfill.

The St. Louis Post-Dispatch reports (http://bit.ly/1aRE8ZI) the radioactive material was found during exploratory work for construction of a trench to separate radioactive waste from an underground fire smoldering in the adjacent Bridgeton Landfill.

Bridgeton Landfill owner Republic Services Inc. is paying to build the trench to keep a smoldering fire away from the West Lake Landfill.

The smoldering just below the surface of the Bridgeton Landfill was discovered in 2010. It became an issue last year, when nearby residents complained about the odor.