BRIDGETON, Mo. (AP) — It will be at least a year and a half until construction starts on a barrier between smoldering at a suburban St. Louis landfill and radioactive waste buried at an adjacent landfill.

The St. Louis Post-Dispatch (http://bit.ly/1lBTA86 ) reports that a new analysis from the Army Corps of Engineers shows that the lengthy delay is necessary because engineers must first determine the location of all radioactive materials in West Lake Landfill in Bridgeton. Cold War-era nuclear waste was illegally dumped there more than 40 years ago.

Engineers also say that movement of the underground smoldering at neighboring Bridgeton Landfill is unpredictable.

The barrier is aimed at keeping the smoldering from reaching the nuclear waste. Officials say it could go as deep as 180 feet.

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Information from: St. Louis Post-Dispatch, http://www.stltoday.com