 Remediation included a plutonium "mining" operation called the Johnston Atoll Plutonium Contaminated Soil Cleanup Project.The collected radioactive soil and other debris was buried in a landfill created within the former LE-1 area from June 2002 through November 11, 2002.Remediation at the Radiation Control Area included the construction of a 61-centimeter-thick cap of coral sealing the landfill.