This report was worked out by the U.S. Far Eastern engineering corps in 1996 after making a wide-ranging investigation on the basis of its 1992 research report about the environmental pollution in the U.S. military bases in south Korea.

At that time the corps sent underground water from the U.S. military base in Waegwan to research institutes in Texas, U.S., and Japan for analysis. The results of the analysis led to detecting lead 17 times the allowed level in the underground water.

Carcinogen was found in two wells south of the base.