Original story from The Japan Post June 7, 2016
TOKYO (Jiji Press) — The Environment Ministry on Tuesday drew up a basic plan to use soil contaminated with radioactive substances in the nuclear disaster-hit prefecture of Fukushima to build roads.
Under the basic plan, tainted soil with relatively low radioactive cesium concentration of up to 5,000 to 8,000 becquerels per kilogram will be used to form the base layer of roads. This will then be covered with uncontaminated soil, asphalt and other material with thickness of at least 50 to 100 centimeters.
By covering radioactive soil with untainted material, the health risk of residents living in nearby areas will be minimized as their annual radiation dose will be kept to 0.01 millisievert or less, according to the ministry.
The ministry plans to launch a verification project in Minamisoma, Fukushima Prefecture, as early as this summer to test the use of contaminated soil as the base material for road construction.