From CBS News, yesterday:

After decades of cancer cases and public outcry, the federal government this week will begin the long-awaited cleanup of a nuclear waste dump in Armstrong County. 

The site in Apollo was a dumping ground for hundreds of 55-gallon drums containing radioactive nuclear waste. But come this week, a half-billion-dollar project to safely remove it will finally begin. 

The U.S. Army Corps of Engineers gave KDKA an exclusive look at the painstaking, intensive and expensive process to rid the site of radioactive waste in Armstrong County.   

https://www.cbsnews.com/pittsburgh/news/nuclear-waste-dump-apollo-armstrong-county-cleanup/

The Apollo plant is in Apollo Borough in the South West of Armstrong County, Pensylvannia, around 20 miles from the City of Pittsburgh

No actual number of 55 gallon drums is given. I guess they don’t know but the overall amount of waste is estimated by the US army at 30 000 tons.

https://www.lrd.usace.army.mil/Mission/Projects/Article/3646985/shallow-land-disposal-area/

How does the amount at Sellafield, just over the border and upwind/upstream, from Scotland compare?

Estimated as not all properly recorded – 3 to 6 million tons, at least 100 times as much.

https://www.wired-gov.net/wg/news.nsf/articles/How+much+radioactive+waste+is+there+in+the+UK+13012020153800 ukinventory.nda.gov.uk

And, the Sellafield stuff is far more hazardous for folk living downwind and downstream – us.

https://www.gov.uk/government/publications/uk-radioactive-waste-and-material-inventory-2022/uk-radioactive-waste-inventory-2022