Why have I never heard of this site and previous accident?
It was a gubmint owned, contracter operated site, mum’s the word. Easy to sweep under the carpet when most research is classified.
This was a test site for Rocketdyne shuttle engines. In the hills between Los Angeles County & Ventura County, between Chatsworth & Simi Valley. Near Box Canyon.
I lived in So Calif for over 29 years.
I could see the glow from these tests, and on quiet nights, could also hear the roar, from my house in the SFV.
They were testing rocket ENGINES-—NOTHING nuclear. I know people who worked there. NEVER a word about anything nuclear.
The various propellants for rocket engines are pretty tricky, but NOT nuclear.
IF it is a Superfund site, it is because of the propellants being tested-—nothing nuclear.