Cemex has a (((special waste))) disposal facility where they bring in toxic waste from all over the place and burn it in a 800 degree dirt burner, releasing toxic oily shit into the atmosphere for people in Everett Washington to breath. Besides feeding this dirt burner 24/7, they dig tremendously deep pits and fill them back in.
I cannot say for a fact, but I would be very surprised if there was not a large amount of bodies deep under this site. Though the DNA has probably been cooked out completely.
https://wastebits.com/locator/location/cemex-pcs-landfill