 A 166 ft (51 m) concrete silo was erected within the east boundary of the LOOW, immediately next to Porter Center Road, which was publicly accessible. A fence with signs warning of "radioactive material" ran next to the road. In 1952, drums containing 3,869 short tons (3,510,000 kg) of highly-radioactive K-65 residues were loaded into the silo. The concrete silo was dismantled sometime after 1979.
