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ST. LOUIS COUNTY, MO. (KTVI) – The U.S. Army Corps of Engineers has started sampling the soil at the Boeing St. Louis site in North St. Louis County. They are trying to determine if radioactive levels in the soil are higher along James S. McDonnell Boulevard.

The Department of Energy’s Cold War era nuclear programs may may be a contributing factor.

The Corp of Engineers say a clean-up will begin if higher than normal background radiation is found. The sampling is not expected to impact the clean-up of radioactive material at a site near the Boeing plant. However, the Corp is asking that the public stay clear of areas marked for sampling.

Sampling will continue until the end of 2013. Results will be available three weeks after sampling has been completed.