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Field trial: new layered bioretention media removed 6PPD quinone to nondetect in initial full‑scale tests

6PPD State of the Science Forum (Day 1) · December 9, 2025

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Summary

Researchers and King County staff presented the first full‑scale field data for a layered high‑performance bioretention soil media (HPBSM). Across sampled storms influent 6PPD quinone ranged 11–72 ng/L and researchers reported nondetect effluent concentrations in the initial deployments.

King County and consultant teams presented the first full‑scale field performance data for a high‑performance bioretention soil media (HPBSM) designed to reduce nutrient export while capturing tire‑derived contaminants.

Dylan Ahern (Herrera Environmental Consultants) described the layered media — a surface mix of sand, coir and biochar over a polishing layer (sand, activated alumina and iron aggregate) —…

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