corrosive

"CAUTION: Can cause severe ulceration and chemical burns on contact."

I believe, but can't prove, this is Stringfellow Acid Pits in Jurupa Valley, California. If correct, it was a property with about 11 unlined ponds used to dump waste acids and other bad stuff. It was closed in 1972 when traces of waste were allegedly found in a nearby water district's wells.

It's a visual shock to see materials handled like this in the United States.

I hope the photographer was upwind.

This was before the Department of Transportation had standardized placarding on trucks hauling various materials. Nowadays, there are placards on trucks that correspond to a Emergency Response Guide book. Truck on fire? Here's what you need to know...

I remember seeing acid waste sumps at various enterprises. The local District Attorney's crime laboratory had an acid waste sump.

I see a Peterbuilt emblem on the cab and think this tractor is a late 1950s 352. Feel free to correct me if you see something different.