BES: 2020 study shows RCA residues enter storm system; filters and flushing mitigate risks
Bureau of Environmental Services recapped a 2020 sampling study that found particulate tear-gas residues in catch basins and said catch-basin filters and street flushing are effective at preventing pollutants from reaching the Willamette River.
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Bureau of Environmental Services staff told the committee that work after the 2020 public-order events found elevated concentrations of metals and particulate residues consistent with riot control agents near deployment epicenters, and that those residues tapered to background levels before reaching river outfalls.
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