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Passive Monitoring of 6PPD-Quinone Using Polar Organic Chemical Integrative Samplers in Thornton Creek Sampling and Analysis Plan

Passive Monitoring of 6PPD-Quinone Using Polar Organic Chemical Integrative Samplers in Thornton Creek SAP Stormwater runoff in urban streams contains 6PPD-quinone (6PPDQ), which is acutely toxic to salmonids, especially coho salmon. Only discovered in 2021, our understanding of sampling methods and the prevalence of 6PPDQ in King County streams is limited. Further, because 6PPDQ concentrations are dynamic, and the chemical induces a rapid onset of toxic effects on salmonids at low concentrations (parts per trillion), it’s difficult to monitor with traditional grab samples, which may miss acutely toxic events. To identify toxic hotspots, monitor success of mitigation projects, and meet Clean Water Healthy Habitat goals, King County needs a 6PPDQ monitoring approach that can reliably track trends in 6PPDQ concentrations in streams over time and across the County. This study will help King County better understand the benefits and limitations of using a specific type of passive sampler, Polar Organic Chemical Integrative Samplers (POCIS), to meet the County’s 6PPDQ monitoring needs. This Sampling and Analysis Plan details a pilot study of deploying, retrieving, processing, and analyzing POCIS units for 6PPDQ.

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    Passive Monitoring of 6PPD-Quinone Using Polar Organic Chemical Integrative Samplers in Thornton Creek SAP

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