 About 45,000 tons of soil contaminated with radioactive isotopes was collected and placed into a fenced area covering on the north of the island.The area was known as the Radiological Control Area, and heavily contaminated with highly radioactive Plutonium.The Pluto Yard is on the site of the LE1 where the 1962 missile explosion occurred and also where a highly contaminated loading ramp was buried that was made for loading plutonium contaminated debris onto small boats that was dumped at sea.