"Thousands of pounds of human waste, close to 14,000 hypodermic needles cleaned out from Santa Ana River homeless encampments" - https://www.ocregister.com/2018

"Thousands of pounds of human waste, close to 14,000 hypodermic needles cleaned out from Santa Ana River homeless encampments" - https://www.ocregister.com/2018/03/08/thousands-of-pounds-of-human-waste-close-to-14000-hypodermic-needles-cleaned-out-from-santa-ana-river-homeless-encampments/ https://www.ocregister.com/2018/03/08/thousands-of-pounds-of... They will also need to remove a few inches of topsoil to clean it up. This is the sort of procedure that is used to clean up toxic chemical spills, high levels of pollution, and nuclear waste.