Pondcrete

[2] The material was used by the United States Department of Energy and its contractor, Rockwell International, in an attempt to handle the radioactive waste from contaminated ponds in the Rocky Flats Plant for burial in Nevada desert.

Due to problems in production, many of the blocks did not harden correctly and eventually began to seep from the boxes causing large scale environmental contamination of the area.

[14] Later it would be Jim Stone who would file a lawsuit against the company, claiming that they had concealed environmental, safety and health problems from the United States Department of Energy.

The United States Department of Energy (DOE) and Rockwell violated the Resource Conservation and Recovery Act (RCRA) by illegally storing, treating and disposing of residues in more than 17,000 blocks of pondcrete and saltcrete in plastic lined cardboard containers outdoors on the 904 Pad at the plant.

Many of the boxes ruptured, possibly due to extreme temperature fluctuations in that region of Colorado, spilling these wastes onto the asphalt pad at Site 904.