The few times I saw a mess like this cleaned up on the ground they first put down a big tarp over the area. The tarp had rubber ports on it where large gauge needles were stuck through. Long, very heavy, small diameter sand bags were carefully laid down along the perimeter to hold the tarp down... I think these were full of lead shot.
Finally a hand pumped tank sprayed the entire area beneath the tarp with a hose connected to one of the ports with a solution that smelled to me a lot like the old Hexachlorophene disinfectant. The tarp itself was clear and you could readily tell if all areas beneath had been well soaked.
An hour or so later the job was done.
That’s back when they wanted to stem the spread of disease. Hey now it’s cool to bring it with you when you immigrate.