In August 2019, the Colorado Department of Public Health and Environment observed mixed results during testing of the Rocky Flats area. The testing, completed by the Jefferson Parkway Public Highway Authority, observed one sample with a plutonium level of 264 picocuries per gram. For reference, the Rocky Flats remediation standard is 50 picocuries per gram. A second sample registered just 1.5 picocuries of plutonium per gram. As of October 2019, testing of the area was ongoing. In February 2020, the parkway project was shut down and local civic authorities withdrew their support when plutonium samples with concentrations five times higher than the remediation standard were found.
