I have old soil in pots that I don't want anymore. It's full of roots and weeds, and not of any use to me anymore. How should I dispose of this soil? edit sorry for the weird photo size. i will do better next time.
I reckon it has to do with the weight that the workers have to pick up (usually no more than 50 lbs). If they err on the side of none, then people will likely try to put a little in at a time. Then they won't care. I imagine if they say a little is okay, then people will fill the bins/bags with soil. I can hear it now, "It's just a little!"
OP said the flower pots are full of weeds. Sounds like even if the plants were an invasive species, 1) they're already dead, and 2) they were out-competed by the local species.
I spoke to someone at Alameda County Industries about this years ago when I had a pile of dirt to get rid of. They suggested parceling it out in the landfill bin over time. Why? I don’t quite remember.